JP2005125716A - Double-side printing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problems that sheets with printed surfaces are smeared by their mutual rubbing attributed to the contact between a first sheet with a printed surface and a second sheet with a printed surface which are fed from a printing part; a conveyance jam is caused among the sheets with printed surfaces; and the sheets with printed surfaces meander or skew, in the continuous double-side printing by a conventional single-process double-side printing device of a single-drum pressing means double-side printing process. <P>SOLUTION: In this double-side printing device, a double-side stencil process printing device 200 comprises a transfer guide 81 which is arranged above a paper refeeding/conveying device 104; holds the tip of the sheet 36a with a printed surface at a transfer position P1 near the printing part 16; and opens the tip of the sheet 36a with a printed surface 4 at an initial position P2 near the upstream side of a sheet refeeding means 45 located lower than the transfer position P1, and a transfer means 87 which reciprocates the transfer guide 81 between the transfer position P1 and the initial position P2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a duplex printing apparatus, and more particularly to a duplex printing apparatus including a duplex stencil printing apparatus and the like.

In general, a laminate structure in which a thermoplastic resin film having a thickness of approximately 1 to 2 μm and a porous support made of Japanese paper fiber or synthetic fiber or a mixture of Japanese paper fiber and synthetic fiber are bonded together. The surface of the thermoplastic resin film of the stencil master (hereinafter referred to as “master”) is brought into contact with the heat generating element of the thermal head and heated perforated / engraved through the operation of the thermal head in the main scanning direction. While the master made by the master transporting means such as a roller (hereinafter sometimes referred to as “master made master”) is moved in the sub-scanning direction (master transporting direction) perpendicular to the main scanning direction, for example, resin or A mesh screen made of a metal mesh body is wound around a porous cylindrical rotatable plate cylinder having a structure in which a plurality of layers are wound. Ink is supplied from the supply member to the master that has been made on the plate cylinder, and the plate on the plate cylinder is pressed by a press means called a press roller, an impression cylinder, or an intermediate press roller (hereinafter referred to as “press roller”). Thermal digital that performs printing by continuously pressing printing paper (hereinafter simply referred to as “paper”) onto the finished master and allowing ink to ooze out from the perforated part of the plate cylinder and the perforated part of the master and transfer it to the paper. A stencil printing apparatus of the type is known. Also known is a stencil transfer printing apparatus that once transfers the ink that has oozed out from the opening portion of the plate cylinder to a transfer cylinder having a rubber sheet and then prints it on a sheet (see, for example, Patent Document 1).
Note that the “plate cylinder” is sometimes simply referred to as a printing drum or a plate cylinder disposed on the outer periphery of the printing drum. I will call it.

In the above stencil printing, in addition to single-sided printing, which prints only on one side of the paper, in recent years, printing is performed on both front and back sides of the paper for the purpose of reducing paper consumption and document storage space. Double-sided printing has come to dominate. As a conventional double-sided printing method / method, using a stencil printing apparatus or the like that performs normal single-sided printing as described above, the paper stacked on the paper feeding unit is passed through the printing unit, and one side of the paper ( Double-sided printed matter by printing on the front side), turning the printed paper discharged and stacked on the paper discharge tray, etc., turning it over, passing it through the printing section again, and printing on the other side (back side) of the printed paper Is what you get. In this double-sided printing method, printing is performed twice, or the total printing is necessary because it is necessary to increase the waiting time until the ink of the single-sided printed matter after the single-sided printing is sufficiently dried to be in a set state. As the time becomes very long, the work of neatly arranging the single-sided printed matter or the setting of the single-sided printed matter again in the paper feeding unit is very troublesome.
In order to improve the conventional double-sided printing method with manual operation as described above, a double-sided printing device capable of automatically performing double-sided printing has been actively developed, and there are several types of double-sided printing devices. Although proposed, they are mainly classified into the following six types, and have advantages and problems described later.

  (1) Two-drum opposed one-pass simultaneous duplex printing method: a first plate cylinder, a second plate cylinder disposed opposite to the first plate cylinder via a paper conveyance path, and a first plate cylinder There is provided contact / separation means for bringing the outer peripheral surface and the outer peripheral surface of the second plate cylinder into contact with and separating from each other. By operating the contact / separation means, the plate cylinders are brought into pressure contact with each other. A double-sided printing method that obtains a double-sided printed matter by performing front-side printing for printing on the front side of the paper, which is one side of the paper, and back-side printing for printing on the back side of the paper, which is the other side of the paper, in a single pass (For example, see Patent Document 2).

  In the double-sided printing method of (1) above, since two plate cylinders are arranged one above the other and pressed against each other, it is necessary to press-contact each plate cylinder even during single-sided printing. In this case, a master for making a plate must be wound on the master and an unprinted master (no plate master) must be wound on the other plate cylinder. The master is unnecessarily consumed during single-sided printing and the operation is troublesome. There is a problem. In addition, in order to hold the master on the outer peripheral surface of each plate cylinder and to have a clamper of a type protruding outward from each outer peripheral surface, in order to press the two plate cylinders together It is necessary to separate the plate cylinders at the positions where the clampers face each other. When the printing speed is increased, the area where the plate cylinders come into contact with each other is reduced and the image amount area is reduced. In order to achieve this, it is necessary to increase the outer diameter of each plate cylinder, which makes it difficult to reduce the size of the apparatus due to an increase in the size of the apparatus. However, it is very difficult to prevent the sheet from being rolled up.

  (2) Stock refeed after single-sided printing, two-pass double-sided printing method ... In contrast to the conventional single-sided stencil printing apparatus, it is configured to be movable along with the paper discharge unit provided with a paper discharge tray. By adding the function of the paper feed tray to the paper discharge tray or adding a new reverse paper feed path, etc., the paper loaded on the paper feed unit is passed through the printing unit for surface printing. After the printed paper on the front side is once discharged and stacked on the paper discharge tray, the front side printed paper on the paper discharge tray is turned over by being conveyed to the reverse feeding path and is again passed through the printing unit. This is a double-sided printing method in which a double-sided printed material is obtained by printing (see, for example, Patent Document 3). This double-sided printing method has the advantage that it can be used with only a slight modification of the conventional single-sided stencil printing apparatus and its configuration.

  On the other hand, in the double-sided printing method of (2), the printing time is long until the double-sided printed material is obtained by performing printing twice, and the ink is sufficiently dried after the surface printing is completed. Since it is not in a so-called set state, when printing is finished on the back side immediately after the front surface printing is finished, pressing means such as a transport roller and a press roller are pressed against the image portion, and the printed image becomes ink or the like. As a result of the problem of smearing or disturbing the sheet, once the surface-printed paper that has been surface printed once is separated and transported again, jamming is likely to occur and the printing apparatus becomes large.

  (3) Two-drum facing transfer cylinder intervening one-pass simultaneous double-sided printing method: first and second plate cylinders that are provided with ink supply means and are rotatable by winding a master around the outer peripheral surface; Using a transfer cylinder positioned between the second plate cylinder and transferring the ink image from the second plate cylinder to the transfer cylinder, and then transferring the ink image on the transfer cylinder to the back side of the same paper. Is a double-sided printing method in which printing is simultaneously performed on the front and back surfaces of a sheet (see, for example, Patent Document 4). In the double-sided printing method of (3) above, the density difference and the image quality difference between the printed images on the front surface and the back surface cannot be eliminated, and as a result, 3 drums including the transfer cylinder are arranged, resulting in a large printing apparatus. Or has to be cleaned.

  (4) 1-drum divided printing simultaneous reversal type duplex printing method: a printing drum on which a master plate having a first plate-making image and a second plate-making image formed is wound, and paper is supplied in the vicinity of the printing drum And a first paper image formed on the first surface of the paper by pressing the first surface of the paper supplied by the paper supply device against the first plate-making image on the printing drum. Pressing means, paper reversing means for reversing the paper on which the first print image is printed on the first surface, and the second surface of the paper reversed by the paper reversing means is the second surface on the printing drum. A second pressing unit that presses against the plate-making image to form a second print image on the second surface of the paper, and simultaneously prints on the front and back surfaces of the paper in one plate-making process and one printing process. This is a double-sided printing method (see, for example, Patent Document 5).

  In the double-sided printing method (4) described above, if the image size at the time of double-sided printing is limited as compared with the above-described three double-sided printing methods and the one-drum divided transfer cylinder 1-pass double-sided printing method described later, a compact printing apparatus is used. However, there is no problem in single-sided printing and the density difference between the printed images on the front and back sides, and both sides can be printed at high speed in a short time, saving the time required for printing, and the advantage of high productivity. Have. On the other hand, in the above-mentioned double-sided printing method (4), for example, in the printing apparatus described in JP-A-9-95033, there is a serious question about the certainty / reliability of paper conveyance and high-speed printing compatibility. In addition, two press means (primary and secondary press rollers 17, 24 as first and second press means) are used, and ink supply means (7, 8) are provided in the plate cylinder correspondingly. There is also a problem that the configuration around the printing unit, which requires two places, is complicated.

  (5) 1-drum division transfer transfer cylinder 1-pass double-sided printing method: This is a double-sided printing method located in the middle of the above (3) and (4) (for example, see Patent Document 6). The basic configuration of a stencil printing machine employing this one-drum division transfer cylinder one-pass duplex printing system is that a plate cylinder having a front surface printing area and a back surface printing area on one outer surface of the printing cylinder, Conveying means for conveying paper between a transfer cylinder on which the back side ink image transferred by the ink that has passed through the back side printing area is formed, and a transfer cylinder on which the plate cylinder and the back side ink image are formed Etc.

  In the double-sided printing method of (5) above, the paper passes between the plate cylinder and the transfer cylinder on which the back-side ink image is formed, so that printing can be performed simultaneously on the front and back surfaces of the paper in one pass. That is, in the double-sided printing method, it is only necessary to have one plate cylinder, one ink supply means, one transfer cylinder, and one plate-making unit and plate-removing unit. By making the diameter ratio between the plate cylinder and the transfer cylinder 2: 1, the plate cylinder and the transfer cylinder are continuously rotated at a constant rotation speed (constant rotation speed). There is also an advantage that printing can be performed.

On the other hand, in the double-sided printing method of (5) above, the ease of ink ejection from the outer peripheral surface of the plate cylinder is the same in both the front surface printing area and the back surface printing area, and the material having ink repellency is the transfer cylinder. In addition, for example, when compared on the basis of simultaneous printing on the front and back surfaces based on the same plate-making image of the same document, the outer periphery of the transfer cylinder The amount of ink transferred to the surface is smaller than the amount of ink transferred directly from the outer peripheral surface of the plate cylinder to the paper. As a result, even in the double-sided printing method, there is a problem in that unevenness in print image density or difference in print image density occurs between the print image for the front surface and the print image for the back surface.
(6) All the problems (1) to (5) above can be solved, one-sided printing can be performed without using a useless master, and a printed matter with good image quality can be obtained during double-sided printing. Innovative one-step double-sided printing device capable of suppressing an increase in installation space, that is, the double-sided printing method (4) is the basic method (however, a press roller and a single ink as a single pressing means) Adopting supply means) (hereinafter referred to as “one-drum, one-press means double-sided printing method”), a new double-sided solution that solves and eliminates the problems of lack of certainty and reliability of paper conveyance and high-speed printing compatibility A printing apparatus has been proposed and tried (for example, see Patent Document 7).

  Incidentally, in Japanese Patent Application Laid-Open No. 2003-200355 proposed by the present applicant, as shown in FIG. 17, a single plate cylinder 212 and a press having a diameter smaller than the outer diameter of the plate cylinder 212 as a single pressing means. A double-sided printing apparatus 201 having a novel configuration such as an auxiliary tray 208 as a refeed storage unit, a refeed unit 209, a switching member 210 as a switching unit, and the like by skillfully utilizing the sheet conveying action by the rotation of the roller 213. It is disclosed. Each symbol used in FIGS. 17 and 18 corresponds to a symbol obtained by adding a numeral 200 to a symbol in each figure of the above-mentioned Japanese Patent Application Laid-Open No. 2003-200355 (however, a symbol indicating a sheet is not limited to this).

  In FIGS. 17 and 18, reference numeral 208 a denotes an end fence integrally formed with the auxiliary tray 208, and reference numeral 208 c denotes an auxiliary tray 208 provided with the other end of the surface-printed paper close to the refeed positioning member 224. Reference numeral 222 denotes a sensor serving as a surface-printed paper detection means for detecting this, and re-feeds the surface-printed paper that has been conveyed toward the plate cylinder 212 while abutting and holding it against the outer peripheral surface of the press roller 213. Reference numeral 223 denotes a re-feeding guide member serving as a paper guiding unit. The re-feeding guide unit 225 presses the surface-printed paper conveyed by the re-feeding conveying unit 225 with a predetermined pressing force on the outer peripheral surface of the rotating press roller 213. Re-feeding as a press contact means that can be displaced between a press contact position indicated by a solid line in the drawing and a separate position (not shown) that is spaced from the outer peripheral surface of the press roller 213 The registration roller, numeral 224 a refeed positioning member for temporarily stopping the other end of the surface-printed sheet to be fed again to the printing unit 202 by refeeding unit 225 in place, respectively.

  Reference numeral 225 denotes a refeed conveyance unit having a conveyance unit main body 235, a driving roller 236, a driven roller 237, an endless belt 238, a suction fan 239, and the like. Reference numeral 226 denotes a cleaning unit that cleans the outer peripheral surface of the press roller 213. Reference numerals 227 to 230 denote guide plates that guide the cleaning roller 227 so that the surface-printed paper fed from the printing unit 202 does not touch the cleaning roller 226 and toward the auxiliary tray 208. The rollers 231, 231, and 230 are provided integrally with each other and press the respective peripheral surfaces thereof against the outer peripheral surface of the press roller 213. Reference numeral 231 indicates that the peripheral surfaces of the rollers 228, 229, and 230 are in contact with the outer peripheral surface of the press roller 213. The paper guide plate with a plurality of openings (not shown) 56 denotes a guide plate that guides the surface-printed paper to the auxiliary tray 208 through the space between the guide plate 227 when the switching member 210 occupies the second position shown in FIG. A paper discharge transport unit that is disposed below the claw and to the left of the switching member 210 and includes a driving roller 287, a driven roller 288, an endless belt 289, a suction fan 290, and the like is shown.

  In the duplex printing apparatus 201 shown in FIG. 17, during duplex printing, a first sheet (not shown) is fed from a paper feed unit (not shown) to the printing unit 202, and the surface thereof is placed on the plate cylinder 212. Printing corresponding to the first plate-making image (both not shown) of the wound divided plate-making master was performed, and the printed first surface-printed paper PA1 was guided to the auxiliary tray 208 by the switching member 210. Thereafter, a second sheet (not shown) is fed from the sheet feeding unit to the printing unit 202, and printing corresponding to the first plate-making image of the divided plate-making master is performed on the surface, and the sheet is fed again. The first front-side printed paper PA1 is fed again to the printing unit 202 by means 209, and printing corresponding to the second plate-making image of the divided plate-making master is performed on the back side, and the switching member 210 makes the first sheet Paper on both sides printed (not shown) 06, well-known behavior of the second sheet surface-printed sheet PA2 guiding respectively the auxiliary tray 208 is performed.

JP-A-6-48014 JP-A-6-71996 JP-A-7-81202 JP-A-8-118774 JP-A-9-95033 JP-A-10-129100 JP 2003-200355 A

  However, in the above-described double-sided printing apparatus 201, as shown in FIG. 17, during the double-sided printing operation, the second sheet passes through the printing nip portion between the plate cylinder 212 and the press roller 213, and the second surface printing is performed. When the paper PA2 is sent to the auxiliary tray 208, the first surface-printed paper PA1 is sent from the auxiliary tray 208 toward the nip portion between the plate cylinder 212 and the press roller 213. At this time, as shown in the figure, one end of the surface-printed paper PA2 comes into contact with the printed image (ink image) surface on one end side of the surface-printed paper PA1, thereby one end of the surface-printed paper PA2 Further, there is a problem that rubbing stains are generated on the back surface portion, and rubbing stains are also generated on one end side of the front surface printed paper PA1.

At this time, one end of the surface-printed paper PA2 must be conveyed toward the left in the figure, but one end of the surface-printed paper PA2 comes into contact with one end of the surface-printed paper PA1 conveyed toward the right in the figure. The adhesive force of the ink on the printed paper PA1 and the conveyance force to the right in the figure cancel the conveyance force to the left in the figure, and the surface-printed paper PA2 stops on the spot and a conveyance jam occurs. There is a problem that it will.
FIG. 18 shows a state in which the plate cylinder 212 is slightly rotated from the state shown in FIG. 17, but the front surface printed paper PA2 sent is the state in which the front surface printed paper PA1 is sent and there is no paper. It is dropped on the auxiliary tray 208 and is attracted onto the auxiliary tray 208 by the suction force of the operating suction fan 239, and the conveying force to the left in the figure is canceled by the frictional force of the endless belt 238, There is a problem that conveyance of the front-side printed paper PA2 is hindered and a conveyance jam occurs.

  Further, in the double-sided printing method (6) including the double-sided printing apparatus 201 described above, when the entry of the paper is detected to be reversed and conveyed by the press roller 213, that is, for example, the other end of the surface-printed paper Although the sensor 208c detects that the paper is positioned on the auxiliary tray 208 close to the refeed positioning member 224, the surface-printed paper does not reach between the plate cylinder and the pressing unit due to some trouble. When a jam or the like occurs, the pressing means presses against the plate cylinder (the master that has been subjected to the divided plate making) even though there is no paper, so the outer peripheral surface of the pressing means is stained with ink. . In general, it is necessary to pass a large amount of paper until the dirt is removed, or to remove the plate cylinder that is detachably attached to the apparatus main body and clean the outer peripheral surface of the pressing means. There are also problems such as being wasted and cleaning work is very troublesome.

  Accordingly, the first object of the present invention is to enable one-sided printing without using a useless master, and to obtain a printed material with good image quality with no printed image density difference at the time of double-sided printing, and moreover, A double-sided printing device that is simpler than the conventional one-drum one-pressing unit double-sided printing type one-sided printing device capable of suppressing an increase in installation space, that is, a sheet clamping unit and a moving unit are newly provided. Thus, a double-sided printing apparatus capable of removing the re-feed storage means in the conventional double-sided printing apparatus, the first surface-printed paper sent out from the printing unit during the continuous double-sided printing, etc. Prevents contact with the second surface printed paper and prevents the surface printed paper from rubbing and smearing. The leading edge can be inserted without resistance, and the leading edge of the surface-printed paper can be clamped reliably and satisfactorily to prevent the occurrence of jamming of the surface-printed paper, and the surface-printed paper can meander. By preventing the image from skewing or skewing, it is possible to prevent the print image from tilting or resist from deteriorating due to tilting when printing on the back side. An object of the present invention is to provide a double-sided printing apparatus that can perform this.

  The second object of the present invention is to enable one-sided printing without using a useless master, and to obtain a print with good image quality free from printed image density difference at the time of double-sided printing at a low cost, and further, installation space. 1-drum 1-pressing means capable of suppressing the increase in the double-sided printing type one-step double-sided printing apparatus, in continuous double-sided printing, etc., the first surface-printed paper and two sheets sent from the printing unit It prevents contact with the paper with the surface printed on the eyes and prevents the surface printed paper from rubbing and smearing, and even with loose paper, the front end of the paper can be inserted without any resistance. By securely and satisfactorily holding the leading edge of the paper, it is possible to prevent the front-side printed paper from being jammed, and the front-side printed paper can meander or skew. The double-sided printing device can prevent the print image from being tilted when printing on the back side and the resist from getting worse due to the tilt, etc. Is to provide.

  In addition to the first or second object, the third object of the present invention is that when a load or the like acts in the direction in which the front surface printed paper comes out during conveyance of the front surface printed paper, the clamping force (pushing force) It is an object of the present invention to provide a double-sided printing apparatus that can increase the pressure) and prevent the sheet from slipping out, can set the pinching force small, and can be configured at low cost without the need to make it firmly.

  A fourth object of the present invention is to provide a plate cylinder surface or a pressing means (for example, a press roller) in addition to the first, second, or third object or by itself, for example, by conveying jam of a surface-printed paper or double-sided printed paper. For example, when the surface is dirty, do not discharge the surface-printed paper or double-sided printed paper to the paper output unit, and repeatedly re-feed the paper inside the main body of the machine to print the paper between the plate cylinder and the pressing means. Or, by configuring the double-sided printed paper so that it can be cleaned by pressing both sides a predetermined number of times, it is possible to eliminate the particularly troublesome trouble of removing the plate cylinder from the main body of the apparatus and cleaning it. It is an object of the present invention to provide a double-sided printing apparatus that does not get dirty.

  A fifth object of the present invention is to remove stains on the surface of a pressing means (for example, a press roller) that always touches a printed image surface of a printed matter in addition to the first, second, or third object or alone. While the master is wound around the plate cylinder, the paper is not discharged to the paper discharge section, but repeatedly re-feeds within the main body of the machine, pressing both sides of the paper a predetermined number of times between the plate cylinder and the pressing means for cleaning. By being configured so that dirt on the surface of the pressing means (for example, a press roller) can be removed in a short time, the troublesome work such as removing the plate cylinder from the apparatus main body and cleaning can be saved. Another object of the present invention is to provide a double-sided printing apparatus that is not contaminated by cleaning or the like.

  In order to solve the above-described problems and achieve the above object, the present invention is characterized in that the invention according to each claim adopts the following configuration. The invention according to claim 1 is the plate cylinder on which the divided plate-making master in which the first plate-making image and the second plate-making image are formed side by side along the rotation direction of the plate cylinder is wound, and the plate A printing unit having pressing means that can be moved toward and away from the cylinder; a paper feeding unit that feeds paper toward the printing unit; and a paper discharge unit that discharges printed paper printed by the printing unit. And the printing unit temporarily holds the surface-printed paper on which the printed image is formed corresponding to the first plate-making image or the second plate-making image, and then the surface-printed paper is Refeeding means that feeds toward the pressing means, reverses the pressing means and feeds again toward the printing section, and a front end of the surface printed paper fed from the printing section near the printing section. Nipping near the first position and upstream of the re-feeding unit lower than the first position Paper nipping means for opening the front end of the surface printed paper at a second position in the vicinity, movement means for reciprocating the paper nipping means between the first position and the second position, and the paper nipping When the means occupies the first position, the paper clamping means is opened once and then operated to clamp the front end of the surface-printed paper, and the paper clamping means occupies the second position. An operation timing control means for operating the paper clamping means to open the front end of the surface printed paper, and guiding the paper that has passed through the printing section to the paper clamping means or the paper discharge section. Switching means, and printing is possible on both sides of the paper with one rotation of the plate cylinder.

  According to a second aspect of the present invention, there is provided the plate cylinder on which the divided plate-making master in which two first and second plate-making images are formed side by side along the rotation direction of the plate cylinder and the plate are wound. A printing unit having pressing means that can be moved toward and away from the cylinder; a paper feeding unit that feeds paper toward the printing unit; and a paper discharge that discharges printed paper printed by the printing unit. And the surface-printed paper having a printed image formed on the surface thereof by the printing unit, the surface-printed paper is sent out toward the pressing means, and is reversed by the pressing means. A double-sided printing apparatus comprising: a refeeding unit that refeeds toward a printing unit; and a switching unit that guides paper that has passed through the printing unit to the refeeding unit or the paper discharge unit. The front end of the surface-printed paper fed from the printing unit is moved to the first portion near the printing unit. A sheet nipping means for nipping near the position and opening the front end of the surface-printed sheet at a second position near the upstream side of the refeeding unit lower than the first position; a first position and a second position; Moving means for reciprocating the paper clamping means between the position and the paper clamping means, when the paper clamping means occupies the first position, the paper clamping means is once opened and then the surface printed paper And an operation timing control means for operating the paper clamping means to open the front edge of the surface printed paper when the paper clamping means occupies the second position. It is characterized by having.

In the invention according to claim 1 or 2, etc., as a configuration / method of “a pressing means that can be moved toward and away from the plate cylinder”, a pressure that can be moved toward and away from the outer peripheral surface of the plate cylinder (or printing drum). A press roller system that presses a press roller as a means against the outer peripheral surface of the plate cylinder, and an impression cylinder contact / separation that presses the outer surface of the plate cylinder as a pressing means that can be freely contacted and separated from the outer surface of the plate cylinder. There are two types: a method, a plate cylinder contacting / separating method in which printing is performed by pressing a plate cylinder, which can freely come in contact with the outer peripheral surface of the impression cylinder, against the outer peripheral surface of the impression cylinder; For the plate cylinder contact / separation method, the entire plate cylinder (or printing drum) is pressed against the impression cylinder, and the entire drum is pressed toward the impression cylinder and the plate cylinder is pressed against the impression cylinder. There is a trunk extrusion system. As the plate cylinder extrusion method, for example, a metal screen as disclosed in JP-A-1-204781, JP-A-3-197078 or JP-A-3-254984 is swelled from the inside to the outside. A so-called intermediate press roller system (including an ink supply roller) is also used.
As the operation timing control means, if it is not necessary to have the effect as much as the configuration having the cam in claim 3, for example, the solenoid or the control means for controlling on / off of the solenoid or the like Including those constructed by specific means.

  According to a third aspect of the present invention, in the double-sided printing apparatus according to the first or second aspect, the operation timing control means has a cam.

  According to a fourth aspect of the present invention, in the double-sided printing apparatus according to any one of the first to third aspects, the paper clamping means includes an openable / closable clamping member that clamps a front end of the surface printed paper. The clamping member is inclined in the traveling direction of the front surface printed paper fed from the printing unit. Here, “the clamping member is inclined in the advancing direction of the front surface printed paper fed out from the printing unit” means that it is inclined with an acute rising angle with respect to the advancing direction of the front surface printed paper. Means.

  According to a fifth aspect of the present invention, in the double-sided printing apparatus according to any one of the first to fourth aspects, the plate cylinder is the same as the surface-printed paper in a state where the divided master-printed master is wound. The paper or the same paper as the double-sided printed paper on which the printed image is formed on the back side of the printing unit is pressed a predetermined number of times between the plate cylinder and the pressing means while re-feeding in the apparatus main body. Control means for controlling the printing unit, the refeed unit, the switching unit, and the moving unit so as to be discharged to the paper discharge unit later.

  According to a sixth aspect of the present invention, in the double-sided printing apparatus according to any one of the first to fourth aspects, the same sheet is repeated in the apparatus body in a state where the plate cylinder is wound with an unmade master. The printing unit, the refeeding unit, the switching unit, and the moving unit are arranged so that the printing unit is pressed a predetermined number of times between the plate cylinder and the pressing unit while refeeding, and then discharged to the paper discharge unit. It has the control means to control, It is characterized by the above-mentioned.

  The invention according to claim 7 is the plate cylinder on which the divided plate-making master in which the first plate-making image and the second plate-making image are formed side by side along the rotation direction of the plate cylinder is wound, and the plate A printing unit having pressing means that can be moved toward and away from the cylinder; a paper feeding unit that feeds paper toward the printing unit; and a paper discharge that discharges printed paper printed by the printing unit. And the surface-printed paper having a printed image formed on the surface thereof by the printing unit, the surface-printed paper is sent out toward the pressing means, and is reversed by the pressing means. A double-sided printing apparatus comprising: a refeeding unit that refeeds toward a printing unit; and a switching unit that guides paper that has passed through the printing unit to the refeeding unit or the paper discharge unit. The same as the above-mentioned surface-printed paper, with the plate cylinder wound with the divided master plate Press the sheet for a predetermined number of times between the plate cylinder and the pressing means while repeatedly re-feeding the same sheet as the double-sided printed sheet on which the printed image is formed on the back side of the sheet in the printing unit. And a control unit for controlling the printing unit, the refeed unit, and the switching unit so as to be discharged to the paper discharge unit.

  The invention according to claim 8 is the plate cylinder on which the divided plate-making master in which the first plate-making image and the second plate-making image are formed side by side along the rotation direction of the plate cylinder and the plate are wound. A printing unit having pressing means that can be moved toward and away from the cylinder; a paper feeding unit that feeds paper toward the printing unit; and a paper discharge unit that discharges printed paper printed by the printing unit. And the surface-printed paper having a printed image formed on the surface thereof by the printing unit, the surface-printed paper is sent out toward the pressing means, and is reversed by the pressing means. A double-sided printing apparatus comprising: a refeeding unit that refeeds toward a printing unit; and a switching unit that guides the paper that has passed through the printing unit to the refeeding unit or the paper discharge unit. The same paper is repeated in the main body of the machine while the master is wound on the master. Control means for controlling the printing unit, the refeeding unit, and the switching unit so that the printing unit is pressed a predetermined number of times between the plate cylinder and the pressing unit while feeding paper and then discharged to the paper discharge unit. It is characterized by having.

  The “same sheet” in the inventions of claims 6 and 8 includes the same sheet fed from the sheet feeding unit as well as printing on the reverse side with the same sheet or printing unit as the front printed sheet. It means a broad concept including the same paper as the double-side printed paper on which an image is formed.

  9. The double-sided printing apparatus according to claim 2, 7, or 8, wherein “the printing unit temporarily holds the surface-printed paper on which the printed image is formed and then directs the surface-printed paper to the pressing unit. The refeeding unit that feeds out and reverses the sheet by the pressing means and refeeds toward the printing unit is, for example, “printing on the surface of the printing unit in a double-sided printing apparatus described in JP-A-2003-200355. Re-feed storage means for temporarily storing the surface-printed paper on which the image has been formed, and re-feed that reverses the surface-printed paper stored in the re-feed storage means and re-feeds it toward the printing section In addition to this, for example, Japanese Patent Application No. 2002, which is another invention proposed by the present applicant and the present inventor as a double-sided printing apparatus that skillfully utilizes the refeeding reversal action of the pressing means. Described in 120826 In the double-sided printing apparatus, the “refeeding storage means for temporarily storing the surface printed paper having the printed image formed on the surface thereof in the printing unit and the surface printed paper is guided to the refeeding storage means. A first position that includes guide means and is displaced so as to guide and convey the surface-printed paper to the refeed storage means; and a second position that is displaced so as to guide and convey the double-side printed paper to the paper discharge unit. Displaceable sheet discharge means that is displaceable between, a displacement means that displaces the discharge sheet conveyance means between the first position and the second position, and reverses the surface printed paper stored in the refeed storage means Refeeding means for refeeding toward the printing section.

  The present invention (Claims 2 to 10) can of course be applied to, for example, the double-sided printing apparatus described in Japanese Patent Application Laid-Open No. 2003-200355 (see Claims 2, 7, and 8), for example, described in Japanese Patent Application No. 2002-120826. It can also be applied to a double-sided printing apparatus. Incidentally, an example in which the double-sided printing apparatus according to claim 7 of the present invention is applied to the double-sided printing apparatus described in Japanese Patent Application No. 2002-120826 is as follows. That is, relative to the plate cylinder and the plate cylinder on which the divided plate-making master in which the first plate-making image and the second plate-making image are formed side by side along the rotation direction of the plate cylinder is wound. A printing unit having pressing means that can freely come into contact with and separating from the printing unit; a paper feeding unit that feeds paper toward the printing unit; a paper discharge unit that discharges printed paper printed in the printing unit; and the printing unit A sheet re-feed storage means for temporarily storing the surface-printed paper on which the printed image is formed and a guide means for guiding the surface-printed paper to the re-feed storage means. A first displacement position (first position) that is displaced so as to be guided / conveyed to the re-feeding storage means and a second displacement position (first position) that is displaced so as to guide / convey double-side printed paper to the paper discharge unit. 2) and the above-mentioned paper discharge means Displacement means for displacing the feeding means between a first displacement position (first position) and a second displacement position (second position), and a surface printed sheet stored in the refeed storage means And a sheet refeeding unit that re-feeds the sheet toward the printing unit. During the first rotation of the plate cylinder during double-sided printing, one sheet is fed from the sheet feeding unit to the printing unit. The sheet is fed to perform printing corresponding to one of the first plate-making image and the second plate-making image on the surface, and the paper discharge conveying means is displaced to the first displacement position (first position). After the surface-printed paper printed is guided and conveyed to the re-feed storage means, the surface-printed paper is printed by the re-feed means on the second rotation of the plate cylinder during duplex printing. Is re-supplied to the printing unit and either the first plate-making image or the second plate-making image is provided on the back side of the printing portion. Both sides that perform printing corresponding to the direction and guide / carry the double-sided printed paper printed by the paper delivery / conveyance means to the second displacement position (second position) to the paper delivery unit. In the printing apparatus, in the state where the plate cylinder is wound with the divided pre-printed master, the front-side printed paper or the double-side printed paper on which the printed image is formed on the back surface thereof by the printing unit The printing unit, the refeeding unit, the displacing unit, and the discharge unit are configured to press the predetermined number of times between the plate cylinder and the pressing unit without discharging the sheet to the sheet discharging unit. It has a control means for controlling the paper discharge transport means.

  As another example in which the double-sided printing device according to claim 8 of the present invention is applied to the double-sided printing device described in Japanese Patent Application No. 2002-120826, the first platemaking image and the second platemaking along the rotation direction of the plate cylinder. The printing cylinder having the divided plate-making master formed with two images arranged side by side, a printing unit having a pressing means that can be moved toward and away from the printing cylinder, and a sheet of paper toward the printing unit A paper feeding unit for feeding the paper, a paper discharge unit for discharging printed paper printed by the printing unit, and a front-side printed paper having a printed image formed on the surface thereof in the printing unit. A first displacement position (displaced for guiding and transporting the surface-printed paper to the re-feed storage means includes a re-feed storage means and guide means for guiding the surface-printed paper to the re-feed storage means. First position) and double-sided printed paper A paper discharge transport means that is displaceable between a second displacement position (second position) that is displaced so as to be guided and transported to the section, and the paper discharge transport means in a first displacement position (first position). Displacing means for displacing between the first displacement position and the second displacement position (second position), and the surface-printed paper stored in the refeed storage means is reversed and refeeded toward the printing section. A sheet re-feeding means, and at the first rotation of the plate cylinder during double-sided printing, a sheet of paper is fed from the sheet feeding unit to the printing unit and a first plate-making image and Printing on the surface-printed image corresponding to any one of the two plate-making images, and re-feeding the surface-printed paper printed by the discharge-conveying means being displaced to the first displacement position (first position). After being guided, transported and held in the paper storage means, the re-feeder is turned on the second rotation of the plate cylinder during duplex printing. The sheet having the front surface printed thereon is re-fed to the printing unit and printing corresponding to the other one of the first plate-making image and the second plate-making image is performed on the back surface thereof, and the paper discharge conveying means is a second one. A double-sided printing apparatus that guides and conveys a double-sided printed paper printed by displacing to a displacement position (second position) to the paper discharge unit, wherein the plate cylinder winds an unmade master In this state, the front-side printed paper or the double-sided printed paper on which the printed image is formed on the back side of the printing unit is not discharged to the paper discharge unit, and a predetermined amount is provided between the plate cylinder and the pressing unit. It has control means for controlling the printing section, the refeeding means, the displacing means, and the discharged paper transporting means so as to be discharged to the discharged paper section after being pressed a number of times.

  The invention according to claim 9 is the double-sided printing apparatus according to claim 6 or 8, further comprising plate-free plate-feeding means capable of transporting and winding the unprinted master to the plate cylinder, The control means controls the non-plate making plate feeding means so as to automatically feed the unprinted master to the plate cylinder.

  According to a tenth aspect of the present invention, in the double-sided printing apparatus according to any one of the fifth to ninth aspects, only the first image area corresponding to the first plate-making image in the divided plate-making master on the plate cylinder. The first printing pressure range pattern for applying printing pressure to the second printing pressure and the second printing pressure for applying printing pressure only to the second image area corresponding to the second plate-making image in the divided plate-making master on the plate cylinder Selectively one of at least three printing pressure range patterns: a range pattern and a third printing pressure range pattern that applies a printing pressure from the first image area to the second image area. Switchable printing pressure range variable means, and when the control means presses the predetermined number of times, the printing pressure range is one of the first printing pressure range pattern and the second printing pressure range pattern. Select the pattern or the first printing pressure And controlling the printing pressure range variation means so as to select the circumference pattern and the second print pressure range pattern alternately.

  As described above, according to the present invention, it is possible to provide a novel double-sided printing apparatus by solving the problems of the conventional double-sided printing apparatus as described above. The effects for each claim are as follows. According to the first aspect of the present invention, single-sided printing can be performed without using a useless master, and at the same time, a printed matter with good image quality free from printed image density unevenness and printed image density difference can be obtained at low cost and easily. New double-sided printing device, that is, a sheet holding unit and a moving unit, which are more simplified than the conventional one-drum one-pressing unit double-sided printing one-step double-sided printing device capable of suppressing an increase in installation space. Therefore, even if the paper is weak, etc., the leading edge of the paper can be inserted without resistance, and the leading edge of the surface printed paper can be clamped reliably and satisfactorily. It is possible to provide a novel double-sided printing apparatus that eliminates the need for a paper storage unit, and prints the surface printed paper sent from the printing unit and the surface mark on the paper refeed unit. This prevents contact with the printed paper and prevents the surface-printed paper from rubbing and smearing. It can be transported satisfactorily in a stable state without meandering or skewing, and this can prevent the printed image from being tilted during printing or the resist from deteriorating due to tilt or the like.

According to the second aspect of the present invention, it is possible to perform single-sided printing without using a useless master, and at the same time, it is possible to easily and inexpensively obtain a printed matter with good image quality without printed image density unevenness or printed image density difference during double-sided printing. A double-sided printing apparatus including a conventional one-drum, one-pressing means double-sided printing one-step double-sided printing apparatus that can suppress an increase in installation space, and is a surface-printed paper fed from a printing unit Can be prevented from contacting the surface printed paper in the paper re-feeding section to prevent the surface printed paper from rubbing and smearing. This can be done reliably and satisfactorily to pinch the leading edge of the surface-printed paper, preventing the occurrence of jamming of the surface-printed paper, and the surface-printed paper can meander To provide a double-sided printing device that can be transported well in a stable state without skewing, thereby preventing a printed image from being tilted during printing, or preventing the resist from deteriorating due to tilt or the like. Can do.
According to the invention described in claim 3, in addition to the effect of the invention described in claim 1 or 2, the operation timing control means has a cam so that, for example, a solenoid and a control device for controlling on / off of the solenoid are provided. Compared to the case of using electrical means, the opening time when the front end of the surface printed paper is held when the paper holding means occupies the first position is a simple cam element shape By adjusting and adjusting the length of the paper, it can be set to a certain length, so that even paper with weakness can be inserted without resistance, and the front edge of the printed paper can be pinched more reliably and better. It is possible to obtain a large margin and degree of freedom, which is advantageous in terms of cost.

  According to a fourth aspect of the present invention, the paper clamping means is inclined in the traveling direction of the front surface printed paper fed from the printing unit, so that the invention according to any one of the first to third aspects is provided. In addition to the above effects, when a load or the like is applied in the direction in which the surface-printed paper is removed during transport of the surface-printed paper, a moment in the direction to increase the clamping force acts, preventing the paper from being removed. In addition, since the holding force can be set small, it is not necessary to make it firmly and can be configured at low cost.

  According to the invention described in claim 5, in addition to the effect of the invention described in any one of claims 1 to 4, the surface of the plate cylinder and the pressing means are used for conveying a surface-printed paper or a double-sided printed paper. (For example, a press roller) When the surface becomes dirty, the paper between the plate cylinder and the pressing means is not repeatedly discharged into the paper discharge unit, but repeatedly fed in the main body of the apparatus, without being discharged to the paper discharge unit. The front and back sides of the front-side printed paper or double-sided printed paper are configured to be pressed and cleaned a predetermined number of times, so that especially the troublesome work such as removing the plate cylinder from the main body and cleaning is saved. In addition, the user is not contaminated by the cleaning.

  According to the invention described in claim 6, in addition to the effect of the invention described in any one of claims 1 to 4, the surface of the pressing means (for example, a press roller) that always touches the printed image surface of the printed matter is stained. In a state where the master is not wound on the plate cylinder, the both sides of the sheet are pressed a predetermined number of times between the plate cylinder and the pressing means while being repeatedly fed again inside the apparatus main body without discharging the sheet to the paper discharge unit. Since it is configured to be pressed and cleaned, it is possible to remove the dirt on the surface of the pressing means (for example, a press roller) in a short time, and to remove the plate cylinder from the apparatus main body and to clean it very much. It can be omitted, and the user is not contaminated by the cleaning.

  According to the seventh aspect of the present invention, it is possible to perform single-sided printing without using a useless master, and at the same time, it is possible to easily and inexpensively obtain a printed material with good image quality without printed image density unevenness or printed image density difference during double-sided printing. 1-drum 1-pressing means double-sided printing type one-step double-sided printing apparatus capable of suppressing an increase in installation space, and printing on a surface-printed paper or double-sided printed paper with a jam When the surface of the cylinder or pressing means (for example, a press roller) is soiled, press the plate cylinder while refeeding it inside the machine without repeatedly discharging the surface-printed paper or double-sided printed paper to the paper output unit. Since it is configured so that it can be cleaned and cleaned by pressing the front and back sides of the surface-printed paper or double-sided printed paper a predetermined number of times with the means, especially the plate cylinder Remove from the body will be able to dispense a very complicated inconvenience such as cleaning, also can provide a double-sided printing apparatus also eliminates the user or the like contaminated with such that the cleaning.

  According to the eighth aspect of the present invention, it is possible to perform single-sided printing without using a useless master, and at the same time, it is possible to easily and inexpensively obtain a print with good image quality without printed image density unevenness or printed image density difference during double-sided printing. A double-sided printing apparatus including a conventional one-drum one-pressing unit and a one-step double-sided printing device of a double-sided printing method, which can suppress an increase in installation space, and always presses a printed image surface of a printed matter. (For example, a press roller) The plate cylinder and the pressing means are repeatedly re-feeded in the main body of the apparatus without discharging the paper to the paper discharge unit in a state in which the unprinted master is wound around the plate cylinder. Since both sides of the sheet are pressed a predetermined number of times between them for cleaning and cleaning, dirt on the surface of the pressing means (for example, a press roller) can be removed in a short time, and the plate cylinder Will be able to dispense a very complicated inconvenience such as cleaning removed from Okimoto body, also it is possible to provide a duplex printing apparatus also eliminates the user or the like contaminated with such that the cleaning.

  According to the invention described in claim 9, the control means controls the non-plate making plate feeding means so as to automatically feed the unprinted master to the plate cylinder. In addition to the effect, an unprinted master can be automatically fed to the plate cylinder.

  According to the tenth aspect of the present invention, when the control means presses a predetermined number of times, the control means either one of the first printing pressure range pattern and the second printing pressure range pattern or the first printing pressure range pattern. The printing pressure range variable means is controlled so as to alternately select the printing pressure range pattern and the second printing pressure range pattern, thereby achieving the effect of the invention according to any one of claims 5 to 9. .

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention (hereinafter referred to as “embodiments”) including the best mode for carrying out the present invention and examples will be described below with reference to the drawings. In the embodiments and modifications, components such as members and components having the same functions and shapes are described with the same reference numerals, and the description thereof will be omitted. In order to simplify the drawings and the description, even components that are to be represented in the drawings may be omitted as appropriate without being specifically described in the drawings.

  First, an overall configuration of a double-sided stencil printing apparatus 200 as an example of a double-sided printing apparatus to which an embodiment of the present invention is applied will be described with reference to FIG. As shown in FIG. 1, the double-sided stencil printing apparatus 200 is disposed at the upper left side of FIG. 1 and makes a master 8 wound in a roll shape, and is disposed at a substantially central portion in FIG. A plate cylinder 1 that winds a master (hereinafter referred to as a “plate-making master”) around an outer peripheral surface, an ink supply means that supplies ink to a plate-making master on the plate cylinder 1, and an outer peripheral surface of the plate cylinder 1 described later A printing section 16 having a press roller 21 or the like as pressing means that presses the paper 36 (an example of a recording medium on the sheet) that can be contacted and separated and presses the sheet 36 (an example of a recording medium on the sheet) on the plate-making master 1, and the plate-making section across the plate cylinder 1 15, a plate discharging unit 17 that peels and discharges a used master on the plate cylinder 1 and a sheet 36 on a sheet feeding tray 35 that is disposed below the plate discharging unit 17 and serves as a sheet feeding table. A sheet feeding unit 30 that feeds toward the A paper discharge unit 19 that peels off the printed paper 36 disposed below the plate making unit 15 so as to face the paper supply unit 30 and discharges the paper 36 to a paper discharge tray 172 as a paper discharge table, and FIG. As shown in FIG. 4, the plate cylinder 1, the plate making unit 15 and the plate discharging unit 17 (all omitted in FIG. 14) are arranged on the upper part of the main body frame 130 as the main body of the apparatus and are transferred from the document receiving table 134. And an image reading unit 18 for reading an image of a document 133 to be read or an image of a document (not shown) placed on a contact glass 135 as a reading unit.

  Further, the double-sided stencil printing apparatus 200 temporarily holds the surface-printed paper on which the printed image is formed on the surface thereof as will be described later, and then directs the surface-printed paper toward the press roller 21. A refeeding unit 48 that is reversed by the delivery press roller 21 and refeeds toward the printing unit 16, and a sheet that has passed through the printing unit 16 (surface-printed paper or double-sided printed paper) And a switching guide 46 as switching means for guiding to the paper discharge unit 19.

  As shown in FIGS. 1 to 4, the refeed unit 48 temporarily holds the surface printed paper on which the printed image is formed by the printing unit 16, and then presses the surface printed paper on the press roller. 21 and a paper refeeding means 45 that is reversed by the press roller 21 and refeeds toward the printing unit 16, and is fed from the printing unit 16 as shown in FIGS. 1 to 4, 8, and 9. The front end of the printed sheet is sandwiched in the vicinity of the movement position P1 as the first position in the vicinity of the printing unit 16, and is initially set as the second position in the vicinity of the upstream side of the refeeding unit 45 lower than the movement position P1. The movement guide 81 as a sheet holding means for releasing the front end of the surface printed sheet at the position P2 (or the standby position P2) and the movement guide 81 reciprocate between the movement position P1 and the initial position P2 as shown in FIG. Moving means to move 7 and when the movement guide 81 occupies the movement position P1 as shown in FIG. 9, the movement guide 81 is opened once and then operated so as to pinch the front end of the surface printed paper. Is provided with a release cam 98, a release pin 99, and the like constituting an operation timing control means for operating the movement guide 81 to open the front end of the front surface printed paper when it occupies the initial position P2.

  As described above, the double-sided stencil printing apparatus 200 includes a single ink supply unit, a single plate cylinder 1 and a single press roller 21, and makes one rotation of the plate cylinder 1 as described later. Therefore, a one-plate cylinder 1-pressing means double-sided printing method capable of printing on both sides of the paper is adopted. The plate making unit 15, printing unit 16, plate discharging unit 17, paper feeding unit 30, paper discharge unit 19, image reading unit 18, refeed unit 45, moving guide 81, moving unit 87, operation timing control unit and switching Each of the guides 46 is configured as a device as will be described later.

  The plate making unit 15 performs plate making on the master 8 and, as shown in FIG. 10, the first plate making image for surface printing along the rotation direction of the plate cylinder 1 (which is also the paper carrying direction X and the master carrying direction X1). A divided master-made master 8X having 8A (hereinafter referred to as “front-side plate-making image 8A”) and a second plate-making image 8B for back-side printing (hereinafter referred to as “back-side plate-making image 8B”), or the same figure As described above, the third plate-making image 8YA having an image amount area corresponding to two sides of the front-side plate-making image 8A and the back-side plate-making image 8B along the rotation direction of the plate cylinder 1 (hereinafter referred to as “one-side plate-making image 8YA”). Has a function and configuration for producing a pre-made master 8Y. The front plate-making image 8A is formed at a position corresponding to the surface region 1A shown in FIG. 1 when the divided plate-making master 8X is wound on the outer peripheral surface of the plate cylinder 1, and the back plate-making image 8B is the same as the back surface region 1B. And corresponding positions.

  In FIG. 1 and FIG. 10 and the like, the master-making master 8Y is indicated with parentheses to distinguish it from the split master-making master 8X. In FIG. 10, the area range of the single-side plate-making image 8YA formed on the plate-making master 8Y is indicated by a two-dot chain line, and the boundary line of the same area range in the master transport direction X1 is the solid line of the front-side plate-making image 8A and the back-side plate-making image 8B. Although the area range is illustrated as being slightly larger, the area range of the single-side plate-making image 8YA is an intermediate unprinted blank area located between the front-side plate-making image 8A, the back-side plate-making image 8B, and these. This is the entire range including the plate making area 8C. In FIG. 10, the front plate making image 8A, the back plate making image 8B, the intermediate non-plate making region 8C, and the single-side plate making image 8YA are drawn out of scale, and the intermediate non-plate making region 8C is particularly in the master transport direction X1. It is exaggerated and drawn.

  The plate making unit 15 includes a master support member 8c as a master support unit that supports the master 8 so that the master 8 can be fed out in the master transport direction X1, a thermal head 11 that heats and makes a master according to image information, and a thermal head. The platen roller 9 serving as a master transporting means for transporting the master 8 while rotating the master 8 in the downstream side of the master transport direction X1 while pressing the master 8 against the master 8, and the master 8 transported by the platen roller 9 are given appropriate tension. In addition, a pair of transport rollers 13 serving as a master transport unit that transports further downstream in the master transport direction X1 and a master 8 that has been pre-made and is not disposed between the platen roller 9 and the pair of transport rollers 13. A master 12 that has been transported by a cutter 12 that is cut to a predetermined length, a platen roller 9 and a transport roller pair 13. Comprising a master guide plate 14 or the like for guiding the clamper 7 was expanded on the plate cylinder 1 as described below the tip.

  The master 8 has a continuous sheet shape and is wound around a synthetic resin roll core 8b to form a master roll 8a. The roll core 8 b protrudes from both end faces of the master roll 8 a and is formed longer than the width of the master 8. In the master roll 8a, the roll cores 8b on both ends are rotatably supported by the master support member 8c in a counterclockwise direction, and are detachable from the master support member 8c. The master support members 8c on both ends are attached and fixed to plate making side plate pairs (not shown) disposed on the left and right sides of the plate making portion 15 along the master transport direction X1. Therefore, the master 8 is supported by the master support member 8c so that it can be fed out from the master roll 8a in the master transport direction X1.

  The master 8 has a laminated structure in which, for example, a thermoplastic resin film having a thickness of 1 to 5 μm and a porous support made of synthetic fiber or the like are bonded together. In addition, the master is not limited to this, for example, a so-called substantially thermoplastic material in which a porous support made of Japanese paper fiber or a mixture of Japanese paper fiber and synthetic fiber and a thermoplastic resin film are bonded together. A master made only of a resin film is also used.

  The thermal head 11 extends in parallel to the platen roller shaft of the platen roller 9 and the front side and the back side of the paper surface of FIG. 1, and is provided by a contact / separation mechanism including a cam and a spring member (not shown). The platen roller 9 can be contacted and separated via the master 8. The thermal head 11 is urged by the spring member so as to contact the platen roller 9. In the main scanning direction of the thermal head 11, a large number of heat generating elements (not shown) are disposed at portions that contact the platen roller 9 via the master 8. The thermal head 11 passes through an A / D conversion unit, an image signal processing unit, and the like, both of which are not shown, and generates the heat based on a digital image signal processed and sent out by a plate making control device and a thermal head drive circuit (both not shown). By selectively heating the element, it has a well-known function as a plate making means for selectively heating and melting and perforating the master 8.

  The platen roller 9 is formed integrally with the platen roller shaft through a metal core. The platen roller 9 is rotatable clockwise because both end portions of the platen roller shaft are rotatably supported by the plate making side plate pair. The platen roller 9 is connected to a master transport motor 10 as a master transport driving means via a rotation transmission member (not shown) such as a timing belt and a gear, and is thereby driven to rotate clockwise. The master transport motor 10 is composed of, for example, a stepping motor. As described above, when the platen roller 9 is driven to rotate clockwise by the master transport motor 10, the master 8 is pulled out from the master roll 8a.

  The conveying roller pair 13 is provided with an appropriate pressing force applied by an urging means such as a spring and pressed against each other, and both end portions of each roller shaft are rotatably supported by the plate making side plate pair. Thus, they can rotate in opposite directions. The conveyance roller pair 13 is set to rotate at a circumferential speed (conveyance speed) slightly faster than the circumferential speed (conveyance speed) of the platen roller 9 by the rotation transmission member including the master conveyance motor 10. Appropriate front tension is applied to the master 8 while sliding between the two.

  The cutter 12 is a known guillotine type that includes a fixed blade 12b and a movable blade 12a. The cutter 12 is not limited to the guillotine type, and a rotary blade moving type in which the movable blade moves while rotating in the master width direction perpendicular to the master transport direction X1 may be used.

  The drive system around the platen roller 9 and the conveyance roller pair 13 via the master conveyance motor 10 is substantially the same as the rotation transmission mechanism shown in FIG. 2 of Japanese Patent Laid-Open No. 11-77949 proposed by the applicant of the present application, for example. The mechanism is adopted. The plate making unit 15 includes components that constitute plate feeding means capable of transporting and winding the master-made master 8 to the plate cylinder 1. As plate feeding means, a platen roller 9 of the plate making section 15, a conveying roller pair 13, a master guide plate 14, a clamper 7 of a plate cylinder 1 described later, an opening / closing device (not shown) for driving the clamper 7 to open and close, and the plate cylinder 1 are rotated. A main motor 20 to be driven is included.

  The plate making unit 15 is also configured as a non-plate making plate feeding means capable of transporting and winding the unmade master 8 to the plate cylinder 1. The thermal head 11 of the plate making unit 15 is not an essential component as the plate making plate feeding means. The plate-making plate supplying means includes a clamper 7 of the plate cylinder 1, which will be described later, the opening / closing device, the main motor 20, and the like.

  As shown in FIG. 16, in the plate making section 15, the control target drive means of the plate making section 15 including the thermal head 11 driven by a thermal head drive circuit (not shown) and the master transport motor 10 is generally made as plate making drive means. 124.

  The plate cylinder 1 has a two-layer structure including a porous and cylindrical support cylinder and a mesh screen (not shown) made of a resin or metal mesh wound around a plurality of layers so as to cover the outer periphery of the support cylinder. Consists of. The plate cylinder 1 is provided with a printable aperture 1a (hereinafter sometimes referred to as "image forming region") in which a large number of ink-permeable apertures are formed, a clamper 7 and the like, and can be non-printed. A non-opening portion (hereinafter sometimes referred to as “non-image forming region”) is formed along the rotation direction of the plate cylinder 1 indicated by an arrow in FIG. The image forming area includes a first image area 1A (hereinafter referred to as “front surface area 1A”), an intermediate area 1C, and a second image area 1B (hereinafter referred to as “back surface area 1B”) in the plate cylinder 1 in FIG. ”) At least.

  The plate cylinder 1 is wound and fixed around an outer peripheral portion of an end plate flange (not shown), and is rotatably supported around a support shaft 5 that also serves as an ink pipe 5 described later. In terms of the embodiment, the size of the plate cylinder 1 is, for example, a size that can be printed on A3 size paper 36 at the maximum during single-sided printing to obtain an A3 size printed matter, that is, A3 size 1 The plate master 8 has a size capable of being wound, its outer diameter is 180 mm (the outer peripheral length of the plate cylinder 1 is about 565 mm), and its width direction (rotation center axis direction) is 350 mm. It is set.

  The plate cylinder 1 is connected to a main motor 20 as a plate cylinder driving means via a drive transmission means such as a gear or a belt (not shown), and is driven to rotate in the direction of the arrow (clockwise) in FIG. The As the main motor 20, for example, a control DC motor is used. An output shaft of the main motor 20 is provided with an optical rotary encoder (not shown) and a plate cylinder sensor (not shown) that sandwiches the optical rotary encoder and generates a pulse by cooperation of the rotary encoder. Yes. This plate cylinder sensor is composed of a transmission type optical sensor (hereinafter simply referred to as “transmission type optical sensor”) having a light emitting part and a light receiving part, and controls the rotational speed (printing speed) of the plate cylinder 1 and the rotational position. It is used for indexing etc.

  The plate cylinder 1 is rotatably supported by a side plate (not shown), and the rotational driving force of the main motor 20 is transmitted by a drive transmission means such as a gear (not shown) so that the arrow in the figure is synchronized with the plate cylinder 1. Between the ink roller 2 which is driven to rotate in the direction (clockwise) and contacts the inner peripheral surface of the plate cylinder 1 to supply ink, and the ink roller 2 which is arranged in parallel with the ink roller 2 with a slight gap. A doctor roller 3 for forming an ink reservoir 4 having a wedge-shaped cross section and an ink pipe 5 for supplying ink to the ink reservoir 4 are disposed. The ink roller 2, the doctor roller 3, and the ink pipe 5 constitute an ink supply means for supplying ink to the divided master-making master 8X and the master-making master 8Y on the plate cylinder 1, and in this embodiment, the ink supply means is a single ink supply means. It has become one.

  The ink in the ink reservoir 4 is sucked by an ink pump (not shown) from an ink pack (not shown) provided outside the plate cylinder 1 and supplied from a supply hole of the ink pipe 5 to be kneaded. The ink in the ink reservoir 4 is supplied as a thin film on the outer peripheral surface of the ink roller 2 while being measured by the doctor roller 3, and further, the outer peripheral surface of the ink roller 2 comes into contact with the peripheral surface of the support cylinder in the plate cylinder 1. It is supplied to the opening 1a portion of the plate cylinder 1.

  A part of the plate cylinder 1 on the outer peripheral surface of the non-opening portion includes a ferromagnetic stage 6 provided along one bus bar of the plate cylinder 1 and clampers provided on both side ends of the stage 6. A clamper 7 having a rubber magnet that is rotatably attached to the shaft and is openable and closable with respect to the plane portion of the stage 6 is provided. The clamper 7 is opened and closed at a predetermined position by an opening / closing device (not shown) provided on the main body frame side. The plate cylinder 1 is stopped in a state in which the clamper 7 is located almost directly as shown in FIG. The plate cylinder 1 is configured as a plate cylinder unit integrated with the ink pack, the ink pump, and the like, and is inserted into and removed from the main body frame of the double-sided stencil printing apparatus 200 in the axial direction of the ink pipe 5 (detachment). ) It is free.

  In FIG. 1, on the end plate flange of the plate cylinder 1 on the back side of the paper surface and on the main body frame side in the vicinity of the end plate flange, the rotation position of the plate cylinder 1 is detected as shown in FIG. Components for giving start / trigger information to the sheet feeding motor 37 and the registration motor 41 shown in FIGS. 1 and 12 are arranged. That is, as shown in FIG. 11, on the outer wall of the end plate flange on the back side of the plate cylinder 1, a sheet feeding start light shielding plate 121 and a resist start light shielding plate 122 are on the same circumference of the plate cylinder 1. Are attached at predetermined positions at predetermined intervals.

  On the other hand, on the main body frame side in the vicinity of the respective light shielding plates 121 and 122, these are opposed to the same circumference of the plate cylinder 1 to which the paper feeding start light shielding plate 121 and the resist start light shielding plate 122 are attached. A sheet feeding registration sensor 120 is attached in a sandwiching manner. The paper feed registration sensor 120 is a transmissive optical sensor.

  In the present embodiment, the home position (initial position) of the plate cylinder 1 is the tip of the divided plate-making master 8X or the plate-making master 8Y conveyed from the plate-making unit 15 with the clamper 7 positioned substantially directly above. It is set to the same position as the plate feeding standby position, which is the position for receiving and holding. A non-illustrated home position light shielding plate for detecting the home position of the plate cylinder 1 is attached to a predetermined position of the outer wall of the end plate flange on the back side of the plate cylinder 1. A home position sensor (not shown) is attached to the main body frame side in the vicinity of the home position light shielding plate so as to face the home position light shielding plate of the plate cylinder 1 and sandwich it. The home position sensor is a transmissive optical sensor.

  In FIG. 16, the plate cylinder sensor, the paper feed registration sensor 120, and the home position sensor are collectively referred to as a plate cylinder position detection sensor 29 as a plate cylinder position detection unit that detects the rotational position of the plate cylinder 1.

  A single press roller 21 is disposed near the lower part of the outer peripheral surface of the plate cylinder 1 facing the ink roller 2. The press roller 21 is configured by integrally fixing an elastic body to a metal press roller shaft 21 a and is provided to extend in the axial direction of the plate cylinder 1. The press roller 21 is formed so that its lateral width is substantially the same as the lateral width of the plate cylinder 1. As shown in FIGS. 2 to 4, the press roller 21 has a pair of printing arms 22 as pressing means support members disposed on the front side and the back side of the sheet via both ends of the press roller shaft 21 a. , 22 (the front side of the paper is omitted, and is hereinafter referred to as “a pair of printing pressure arms 22”).

  Each printing pressure arm 22 is disposed with a substantially similar shape and the same phase on the near side and the far side of the page. Each printing pressure arm 22 is integrated by an arm shaft 22a attached and fixed to a portion in the vicinity of the bent portion and a connection reinforcing member (not shown). A notch 22b that selectively engages with a locking claw 60a of a locking member 60 described later is formed at the lower end of the printing pressure arm 22 shown in the figure. The arm shaft 22a is rotatable by a predetermined angle via a bearing (not shown) between a pair of housing side plates (not shown) fixed on the main body frame side (see the housing side plate pairs 130a and 130b in FIG. 8). It is supported by.

  The press roller 21 is made of, for example, nitrile rubber (NBR) or silicone rubber (Q), which is an oil-resistant elastic body, and at least the outer peripheral surface of the rubber is subjected to a fine uneven surface treatment. The same glass beads as, for example, vitreous fine particles, which are used for preventing smearing of printed matter, for example, in an offset printing machine or the like, are uniformly coated or adhered. Not only glassy fine particles but also ceramic fine particles may be used. As a result, when the outer peripheral surface of the plate cylinder 1 or the divided master-making master 8X or the master-making master 8Y on the plate cylinder 1 comes into contact, or as described later with reference to FIG. 4, the printed image of the surface-printed paper 36a. Swelling and ink stain due to contact with the ink on the surface side are minimized. For example, in the case where the cleaning roller 226 (cleaning means) as shown in FIG. 17 or FIG. 18 is provided, it is not desired to prevent the remarkable printed matter contamination as described above by vitreous fine particles or ceramic fine particles. If it is acceptable, the outer peripheral surface of the press roller 21 formed of the oil-resistant elastic body is smoothed with an ink-repellent and oil-resistant film such as fluoro rubber (FKM) or polytetrafluoroethylene resin. It may be coated.

  The press roller 21 is divided by the prepress master 8X or the prepress plate on the plate cylinder 1 via the printing pressure range varying means 28, the locking means 64 and the printing pressure arms 22 shown in FIGS. The printing position shown in FIGS. 3 and 4 for pressing the unprinted paper 36 and the surface printed paper 36a against the finished master 8Y, and the non-printing position (also the initial position) shown in FIGS. 1 and 2 away from the printing position. It is configured to be freely displaceable between. As described above, the pair of printing arms 22 as the pressing means support members support the press roller 21 as the pressing means so as to be rotatable, and make the press roller 21 contactable and separable with respect to the plate cylinder 1. It is configured to be displaceable. The printing pressure range varying means 28 may also be called a press roller contacting / separating mechanism as pressing means contacting / separating means.

  In FIG. 2, reference numeral 54 denotes a press roller rotation driving unit as a pressing unit driving unit that rotationally drives the press roller 21. The press roller rotation drive means 54 is a press roller drive as a drive means for driving the press roller 21 to rotate in the direction opposite to the rotation direction of the plate cylinder 1 (counterclockwise) at substantially the same peripheral speed as that of the plate cylinder 1. The motor 55 and the driving force transmitting means for transmitting the rotational driving force of the press roller driving motor 55 to the press roller 21 are mainly configured. The press roller drive motor 55 is fixedly attached to the outer wall of the printing pressure arm 22 on the back side in FIG.

  As shown in FIG. 2, the drive force transmission means includes a toothed drive pulley 56 fixed to the output shaft 55a of the press roller drive motor 55, and a press roller protruding further to the back side of the paper surface of the printing pressure arm 22. A toothed driven pulley 57 fixed to the shaft 21a and a toothed endless belt 58 stretched between the driving pulley 56 and the driven pulley 57 are provided.

  The press roller 21 is a press roller driving motor in accordance with the timing when the unprinted paper 36, the front surface printed paper 36a or the single-side printed paper 36c is pressed against the divided master 8X or the master 8Y on the plate cylinder 1. 55 is rotationally driven. The operation of the press roller drive motor 55 is controlled by the control device 100 shown in FIG. Control of the rotational speed of the press roller drive motor 55 via the driving force transmission means is performed so that the peripheral speed of the press roller 21 is substantially the same as the peripheral speed of the plate cylinder 1 as described above. According to the example of the present embodiment, since the press roller 21 is rotationally driven by the press roller drive motor 55 at a substantially same peripheral speed as the peripheral speed of the plate cylinder 1, it is possible to obtain a good printed matter with no print image positional deviation. it can.

  Between the printing pressure arms 22, there are a re-feed roller 51 as a re-feed roller member, a roller guide plate 50 as a re-feed guide member, etc., in addition to the press roller 21 constituting the re-feed means 45. It is arranged. That is, the paper re-feeding means 45 temporarily holds the front-side printed paper 36a on which the print image is formed by the printing unit 16, and then the front-side printed paper 36a is pressed against the press roller 21 and the re-feed roller. 51 is fed to the plate cylinder 1 while holding the sheet re-feeding / conveying device 104 sent out at a predetermined timing and the surface-printed paper 36a sent out by the re-feeding / conveying device 104 on its outer peripheral surface. A press roller 21 that rotates and conveys, a refeed roller 51 provided in contact with the outer peripheral surface of the press roller 21 on the lower side of the press roller 21, and an outer peripheral surface of the press roller 21 on the right side of the press roller 21. And a curved roller guide plate 50 provided mainly.

  As shown in FIGS. 1 to 4, the refeed conveyance device 104 is disposed below the reciprocating path of the movement guide 81 and in the vicinity of the left side of the refeed roller 51. As shown in detail in FIGS. 2 to 4, the refeed conveyance device 104 is provided integrally with the drive shaft 107 a and a refeed housing 110 that rotatably supports a drive shaft 107 a and a driven shaft 106 a described later. A rear roller 107 serving as a drive roller, and a driven roller provided integrally with a driven shaft 106a disposed upstream of the drive shaft 107a in the paper transport direction X and in the vicinity of the refeed roller 51. As an endless belt that holds and conveys the surface-printed paper 36a that is wound and stretched between the front conveyance roller 106, the rear conveyance roller 107, and the front conveyance roller 106, and is delivered from the moving guide 81. A conveying belt 108 having a plurality of holes (not shown) for sucking air is connected to the driving shaft 107a via a driving force transmitting means such as a gear or a belt. A belt driving motor 105 as a belt driving means for rotating and driving the conveying belt 108 via the rotation driving of No. 7, and the surface-printed paper 36a delivered from the moving guide 81 by conveying air through the plurality of holes. A suction fan 109 for adsorbing and holding on the upper surface side of the belt 108 is mainly configured.

  The re-feeding casing 110 is formed such that its upper surface is opened and its width is slightly smaller than the interval between the printing pressure arms 22, and has a substantially U-shaped side section. The bottom wall of the refeed housing 110 is formed with a number of holes or slits (not shown) for allowing the air flow from the suction fan 109 to escape downward. The refeed housing 110 has bearings (not shown) on both the upstream and downstream sides in the paper transport direction, and these bearings rotatably support the drive shaft 107a and the driven shaft 106a, respectively. Yes. Both ends of the drive shaft 107a penetrate both side surfaces of the refeed housing 110, and both ends of the penetrated drive shaft 107a are rotatable by a bearing member (not shown) provided on the main body frame. It is supported.

  A drive gear (not shown) is attached to one end of the drive shaft 107a (for example, the back side of the paper surface in FIGS. 2 to 4). Driven by rotation. The conveyor belt 108 is intermittently rotated clockwise at a predetermined timing as described later by the operation of the belt drive motor 105 based on the command signal from the control device 100 shown in FIG. The belt drive motor 105 is fixedly provided on the main body frame side. Both ends of the driven shaft 37 a are configured not to penetrate both side surfaces of the refeed housing 110.

  Boss 111 is integrally provided on both outer sides of the upstream end in the paper transport direction X in the paper refeed housing 110, and each boss 111 is formed on each printing pressure arm 22 (not shown). Each of the long hole-shaped escape holes is loosely fitted. With this configuration, the refeeding housing 110 has a drive shaft that is driven by the swinging of each printing pressure arm 22 when the press roller 21 is brought into and out of contact with the plate cylinder 1 by a printing pressure range varying means 28 described later. Oscillation around 107a is possible.

  As shown in FIGS. 2 to 4, the surface-printed paper 36 a is fed by the conveyor belt 108 to the outer peripheral surface of the press roller 21 and the refeed roller 51 at the upstream end portion in the paper transport direction X of the refeed housing 110. A re-feed sensor 52 as a surface printed paper detecting means for detecting that the rear end of the surface printed paper 36a is temporarily held at a predetermined position near the press roller 21 when being conveyed between It is arranged. The re-feed sensor 52 includes a reflection type optical sensor, and includes a rear end (the right end of the front surface printed paper 36a shown in FIG. 4) and a front end (the left end of the front surface printed paper 36a shown in FIG. 4). ).

  The conveying roller rear 107 and the conveying roller front 106 are divided into skewers, are formed of, for example, a toothed roller, and are formed of a high friction material. Incidentally, it is desirable to form the post-conveyance roller 107 and the pre-conveyance roller 106 with a high friction material having oil resistance (ink corrosion resistance) such as nitrile rubber (NBR) or an appropriate resin. The conveyor belt 108 is formed of, for example, a toothed belt, and a plurality of belts are wound and stretched between a conveyor roller rear 107 and a conveyor roller front 106 which are divided into skewers. Incidentally, the conveyor belt 108 is desirably formed of an elastic body having oil resistance (ink corrosion resistance) such as nitrile rubber (NBR) or silicone rubber (Q).

  The suction fan 109 is configured so that the surface-printed paper 36 a delivered from the moving guide 81 is attracted to the upper surface side of the transport belt 108 by sucking air from the plurality of holes formed in the transport belt 108. A fan drive motor is incorporated as fan drive means for rotationally driving 109. Hereinafter, the fan drive motor is simply referred to as “suction fan 109”.

  As shown in FIG. 4, the re-feed roller 51 is a front-side print that is transported by the transport belt 108 after the surface-printed paper 36 a is temporarily sucked and held on the transport belt 108 of the re-feed transport device 105. The used paper 36 a is pressed between the outer peripheral surfaces of the press roller 21 and has a function of driven rotation and conveyance. The re-feed roller 51 is composed of a plurality of rollers divided into skewers, and is formed integrally with the shaft 51a. The re-feed roller 51 is disposed on the lower side of the press roller 21 so that the outer peripheral surface thereof is in pressure contact with the outer peripheral surface of the press roller 21, and both end portions of the shaft 51 a are rotatable between the printing pressure arms 22. By being supported, it receives the rotational force of the press roller 21 and is driven to rotate in the opposite direction (clockwise) to the rotation direction (counterclockwise) of the press roller 21.

  The roller guide plate 50 has a function of guiding the surface-printed paper 36 a conveyed by the rotational force of the press roller 21 toward the plate cylinder 1 by contacting the outer peripheral surface of the press roller 21. The roller guide plate 50 has a curved partial cylindrical shape centered on the press roller shaft 21a in order to guide the surface-printed paper 36a along the outer peripheral surface of the press roller 21. Are fixed between the printing pressure arms 22. The guide surface side of the surface-printed paper 36a on the roller guide plate 50 has a low coefficient of friction with respect to the surface-printed paper 36a and a smooth coating film having ink repellency and oil resistance such as polytetrafluoroethylene resin. It is coated.

  In FIG. 16, the control target drive means of the refeed means 45 includes a press roller drive motor 55, a belt drive motor 105, a suction fan 109, and the like. Various detection means of the paper refeed means 45 include a paper refeed sensor 52 and the like.

  Next, the configuration around the printing pressure range variable means 28 that determines the printing pressure range of the press roller 21 will be described in detail. In this embodiment, as shown in FIGS. 1 and 10, a first printing pressure range pattern that applies printing pressure only to the surface region 1 </ b> A corresponding to the surface plate-making image 8 </ b> A in the divided plate-making master 8 </ b> X on the plate cylinder 1. And a printing pressure range pattern as a second printing pressure range pattern that applies printing pressure only to the back surface area 1B corresponding to the back plate making image 8B in the divided plate-making master 8X on the plate cylinder 1. II and a printing pressure range as a third printing pressure range pattern that applies printing pressure from the front surface area 1A to the back surface area 1B corresponding to the single-side plate-making image 8YA in the master-made master 8Y on the plate cylinder 1. One of at least three printing pressure range patterns with the pattern III can be selectively switched. A mechanism relating to the printing pressure range varying means 28 for selectively switching one of these three printing pressure range patterns is shown in FIGS. The printing pressure range varying means 28 also has a configuration / function for displacing the press roller 21 between the printing position and the non-printing position.

  The printing pressure range changing means 28 includes the above-described arm shaft 22a, the above-described printing pressure arm pair 22, a pair of cam followers 24, 24 (hereinafter referred to as “a pair of cam followers 24”), and a pair of printing springs 25, 25. (Hereinafter referred to as “a pair of printing pressure springs 25”), a printing pressure cam shaft 26, a pair of printing pressure cams 27 and 27 (hereinafter referred to as “a pair of printing pressure cams 27”), and a pair of intermittent cam gears. 65, 65 (hereinafter referred to as “a pair of intermittent cam gears 65”), a pair of intermittent cam drive gears 66, 66 (hereinafter referred to as “a pair of intermittent cam drive gears 66”), a pair of intermittent cams 67, 67 (hereinafter referred to as “a pair of intermittent cams 67”), intermittent cam shaft 68, clutch gear 70, clutch body 71, sleeve 72, spring clutch 73, cam drive shaft 74, cam drive gear 75, stopper 76, 2 solenoid 77, primarily comprised of a spring 78.

  As shown in FIGS. 2 to 4, the above-mentioned components constituting the printing pressure range varying means 28 are basically a press so as to apply a uniform pressing force of the press roller 21 to the outer peripheral surface of the plate cylinder 1. Since the roller 21 is disposed on the front side and the back side of the paper as viewed from FIG. 1 (the front side of the paper is omitted), the components on the back side of the paper will be described as a representative. Description of the front side of the page is omitted. If the printing pressure range variable means 28 does not need the advantages as described above, the above-mentioned components constituting the printing pressure range variable means 28 are, for example, the back of the paper surface of FIGS. Of course, it may be arranged only on the side.

  As shown in FIGS. 2 to 4, a cam follower 24 pivots on the outer wall at the substantially center of the printing pressure arm 22 facing the inside of the printing pressure arm 22 on which the press roller 21 is supported. Is held. As will be described later, the cam follower 24 is composed of a long rolling bearing on the back side of the paper so that it can come into contact with two printing cams 27 and intermittent cams 67, for example, plate cams. On the other end side of the printing pressure arm 22, one end of a printing pressure spring 25 (tensile spring) that urges the press roller 21 in a direction in which the press roller 21 is always pressed against the outer peripheral surface of the plate cylinder 1 is locked. The other end is locked to the housing side plate side. By this printing pressure spring 25, the other end side of the printing pressure arm 22 is urged in a direction of swinging clockwise around the arm shaft 22a. A notch 22b that can be engaged with a locking claw 60a of a locking member 60, which will be described later, is integrally formed at the other end of the printing pressure arm 22, and can be engaged with and disengaged from the locking member 60. .

  On the other hand, as shown in FIGS. 2 to 5, a pair of printing cams 27, 27 (hereinafter referred to as “a pair”) that rotate in synchronism with the rotation of the plate cylinder 1 are provided on the side plates of the casing in the vicinity of the cam followers 24. The printing cam shaft 26 is fixedly supported by a printing cam shaft 26 to which the printing pressure cam 27 is fixed and is described as a representative of the printing cam 27 on the back side of the casing side plate to be represented on the paper surface. Yes. The printing pressure cam 27 is composed of, for example, a plate cam in which a small diameter portion (concave portion) and a large diameter portion (convex portion) are formed.

  A belt pulley or gear (not shown) is fixed to the printing cam shaft 26 and is connected to the main motor 20 via drive transmission means such as a belt and gear (not shown). Is rotated in synchronization with the rotation of the plate cylinder 1. The cam follower 24 is urged by the above-described printing pressure spring 25 so as to always come into contact with the printing cam 27. Therefore, the cam driving means for rotationally driving the printing pressure cam 27 is mainly composed of the main motor 20.

  2 to 7, reference numeral 64 denotes the non-printing position shown in FIGS. 1 and 2 (strictly speaking, the initial position is slightly separated from the non-printing position) except when the paper is passed. The latching means for holding is shown. The locking means 64 is sometimes referred to as a printing pressure releasing means, and is mainly composed of a locking member 60, a support shaft 61, a first solenoid 62, and a tension spring 63. The locking means 64 is disposed on the back side of the page.

  The locking member 60 is swingably supported around a support shaft 61 planted on the casing side plate on the back side of the paper surface, and at one end thereof is selected with the notch 22b of the printing pressure arm 22 described above. An engaging claw 60a that engages with each other is formed. The other end of the locking member 60 is locked with one end of a tension spring 63 that urges the engaging claw 60a to always engage with the notch 22b of the printing pressure arm 22. The other end of the tension spring 63 is locked to the housing side plate side on the back side of the drawing. A plunger 62a of the first solenoid 62 fixed to the casing side plate on the back side of the drawing via a bracket (not shown) is provided on the side of the other end of the locking member 60 facing the arrangement portion of the tension spring 63. It is connected via a pin. The first solenoid 62 uses a pull type.

  As described above, when the first solenoid 62 is energized and the first solenoid 62 is turned on, the printing pressure range variable means 28 is operated, and the press roller 21 is moved to the printing position through the detailed operation described later. Occupy. As a result, the press roller 21 continuously presses the paper 36 while rotating it on the divided master-making master 8X or the master-making master 8Y on the plate cylinder 1. When the energization of the first solenoid 62 is interrupted and the first solenoid 62 is turned off, the printing pressure range variable means 28 is deactivated, and the press roller 21 is separated from the printing position through a detailed operation described later. 1 and 2 occupy the non-printing position (initial position).

  The first solenoid 62 is on / off controlled by the control device 100 described later. By the on / off switching control of the first solenoid 62 by the control device 100, the state is selectively switched between the state in which the printing pressure arm 22 is held and the state in which the holding is released. As will be described later, the first solenoid 62 is turned on when the cam follower 24 is in contact with the large diameter portion of the printing pressure cam 27 and the large diameter portion of the intermittent cam 67 (see FIG. 2).

  As shown in FIG. 5, the intermittent cam 67 is fixed integrally with the intermittent cam gear 65 and is rotatably supported by the printing pressure cam shaft 26. The intermittent cam 67 is provided separately from the printing pressure cam 27 and includes, for example, a plate cam in which a small diameter portion (concave portion) and a large diameter portion (convex portion) are formed. It has the same shape. The intermittent camshaft 68 is rotatably supported by each casing side plate. The intermittent cam gear 65 always meshes with an intermittent cam drive gear 66 fixed to one end of the intermittent cam shaft 68. The printing pressure cam shaft 26 and the intermittent cam shaft 68 are driven to rotate in opposite directions. In the example of the present embodiment, as shown in FIGS. 2 to 4, the printing cam 27 and the printing cam shaft 26 rotate clockwise, and the intermittent cam drive gear 66 rotates counterclockwise. The driven intermittent cam 67 is rotated in the same clockwise direction as the printing pressure cam 27.

  A clutch body 71 is fixed to the other end side of the intermittent cam shaft 68. The clutch gear 70 is rotatably supported on the other end side of the intermittent cam shaft 68. A spring clutch 73 formed by winding a spring 73a is interposed between the clutch gear 70 and the clutch body 71. As will be described later, the rotational force is transmitted from the clutch gear 70 to the clutch body 71 via the spring clutch 73.

  The spring clutch 73 is provided with a sleeve 72 having a fan-shaped convex portion 72a on the outer peripheral portion thereof. One end of the spring 73 a in the spring clutch 73 is wound around the outer periphery of the right side protruding portion of the clutch gear 70 and is fixed to the sleeve 72, and the other end of the spring 73 a in the spring clutch 73 is fixed to the clutch body 71. Therefore, the clutch body 71, the sleeve 72, and the spring clutch 73 are configured to rotate integrally.

  In the spring clutch 73, the winding direction of the spring 73a is set in accordance with the direction of rotational driving, and the winding direction is determined so that the spring 73a is wound and the inner diameter of the spring is reduced when the rotational force is transmitted. It is used as a sex clutch (one-way clutch).

  In the vicinity of the clutch gear 70, there is provided a cam drive shaft 74 that is rotatably supported by the casing side plate and is driven by the rotational force of the main motor 20 being transmitted. A cam drive gear 75 is fixed to the end of the cam drive shaft 74, and the cam drive gear 75 is always meshed with the clutch gear 70 to rotate the clutch gear 70 counterclockwise. In the present embodiment, the drive means for driving the cam drive shaft 74 employs a drive means having a configuration in which the rotational force of the main motor 20 is transmitted via a rotation transmission means (not shown), but is not limited thereto. It may be an electric motor or the like that is provided separately from the main motor 20 and is driven to rotate at least during printing or is always driven to rotate.

  As shown in FIGS. 6 and 7, a substantially U-shaped stopper 76 pivotally supported by a stopper pivot 76 </ b> A is disposed on the casing side plate in the vicinity of the clutch body 71 and the sleeve 72. The stopper 76 is made of, for example, a sheet metal or the like, and a first engagement portion 76a and a second engagement portion 76b that selectively engage with the convex portion 72a of the sleeve 72 are formed at both ends of the stopper 76. Yes.

  A plunger 77a of a second solenoid 77 is connected to the end of the stopper 76 on the first engagement portion 76a forming side via a pin, and the second solenoid 77 is on / off controlled by a control device 100 described later. The The second solenoid 77 uses a pull type and is fixed to the housing side plate. A spring 78 made of a compression spring is interposed between the stopper 76 and the second solenoid 77 main body so as to be wound around the plunger 77a. Therefore, due to the urging force of the spring 78, the stopper 76 is given a habit of constantly swinging clockwise in the figure about the stopper support shaft 76A. As described above, the second solenoid 77 and the driving means (mainly the main motor 20) function as intermittent cam driving means for driving the intermittent cam 67.

  In any state shown in FIGS. 6 and 7, the convex portion 72 a of the sleeve 72 is in contact with and engaged with the first engaging portion 76 a and the second engaging portion 76 b of the stopper 76. The rotation is blocked and stopped, and the rotation of the cam drive shaft 74 is not transmitted to the intermittent cam shaft 68. In these states, the rotation stopping force of the sleeve 72 by the stopper 76 is greater than the frictional force between the outer peripheral surface of the right side protruding portion of the clutch gear 70 and the spring 73a wound around the clutch gear 70, so that the clutch gear 70 is idling. Just doing. Therefore, the rotation of the cam drive shaft 74 is not transmitted to the intermittent cam shaft 68, and the intermittent cam 67 remains stopped at that position.

  As shown in FIG. 6, when the first engaging portion 76a of the stopper 76 is engaged with the convex portion 72a of the sleeve 72 and the rotation of the sleeve 72 is prevented, the clutch gear 70 and the clutch drum 71 are As shown in FIG. 2, the large diameter portion of the intermittent cam 67 is held on the substantially opposite side of the cam follower 24. At this time, the large diameter portion of the printing pressure cam 27 is held in a state of riding on the cam follower 24 as shown in FIG.

  As shown in FIG. 7 from the state shown in FIG. 6, when the second solenoid 77 is energized and the second solenoid 77 is turned on, the plunger 77a resists the urging force of the spring 78 so that the arrow in FIG. When the engagement between the first engaging portion 76a of the stopper 76 and the convex portion 72a of the sleeve 72 is released by being pulled up, the spring clutch 73 is connected in FIG.

  Thereby, the rotation of the cam drive shaft 74 is transmitted to the clutch body 71 via the spring clutch 73. That is, the clutch body 71, the sleeve 72, the spring clutch 73, and the clutch gear 70 are integrally rotated in the counterclockwise direction indicated by the arrow, and the rotational force of the drive means meshes with the intermittent cam shaft 68 and the intermittent cam drive gear 66. It is transmitted to the intermittent cam 67 via the intermittent cam gear 65, and the large-diameter portion of the intermittent cam 67 rotates to a position substantially right to the right in FIG. 2 and is pressed against the cam follower 24.

  Then, the clutch body 71 rotates by a predetermined angle in the counterclockwise direction indicated by the arrow, and the second engaging portion 76b of the stopper 76 is engaged with the convex portion 72a of the sleeve 72 as shown in FIG. When the rotation of 72 is prevented, the spring clutch 73 is disconnected again, and the large-diameter portion of the intermittent cam 67 is held at that position after rotating to a substantially opposite position in FIG. As a result, the cam follower 24 is held in a state where it rides on the large-diameter portion of the intermittent cam 67, and the press roller 21 is held in a state where it is separated from the pressing state with the plate cylinder 1 and occupies the non-printing position.

  Next, when the energization of the second solenoid 77 is interrupted after a predetermined time and the second solenoid 77 is turned off, the stopper 76 rotates in the clockwise direction opposite to the above by the urging force of the spring 78. By releasing the engagement between the second engaging portion 76b of the stopper 76 and the convex portion 72a of the sleeve 72, the spring clutch 73 is reconnected, and as described above, the clutch cylinder 71 and the like are connected. The clutch gear 70 rotates integrally, and the rotational force of the drive means is transmitted to the intermittent cam 67 via the intermittent cam shaft 65 and the intermittent cam gear 65 meshing with the intermittent cam drive gear 66, and the large diameter portion of the intermittent cam 67 2 is rotated to the vicinity of the position shown in FIG. By 2a engaging connection of the spring clutch 73 is cut off again, the large-diameter portion of the intermittent cam 67 is held in that position after rotating to the initial position shown in FIG. When the intermittent cam 67 operates, the press solenoid 21 is held in the non-printing position by turning off the first solenoid 62 of the locking means 64.

  The point at which the press roller 21 is separated from the outer peripheral surface of the plate cylinder 1 (the rear end of the pressing region) is a plate cylinder of the divided plate-making master 8X and the plate-making master 8Y in order to prevent the press roller 21 from being stained due to ink adhesion. The range of the small diameter portion of the printing pressure cam 27 is set so as to be slightly shorter than the winding length to 1. In addition to the printing cam 27 used for the normal single-sided printing operation, by using the on / off switching control of the second solenoid 77 by the control device 100 shown in FIG. 16, a press roller 21 as shown in FIG. The printing pressure range can be easily changed with the simple configuration as described above.

  In the example of the present embodiment, the crest portion of the printing pressure cam 27 and the intermittent cam 67, that is, the large diameter portion of one of the cams 27 and 67 is pressed against the cam follower 24 against the urging force of the printing pressure spring 25. Thus, the printing pressure by the press roller 21 is turned off and released, and the press roller 21 occupies the non-printing position shown in FIG. When the large diameter portion of one of the cams 27, 67 is released from the pressure contact with the cam follower 24, and the outer peripheral surface of the press roller 21 is pressed against the outer peripheral surface of the plate cylinder 1 by the biasing force of each printing spring 25. The press roller 21 occupies the printing position shown in FIGS.

  2 to 4 and 10, the printing pressure cam 27 is used as a reference for normal printing (also for single-sided printing). As shown in FIGS. 2 to 4, the printing cam 27 has a large-diameter portion that is a printing pressure-off portion for escaping the protruding portion of the clamper 7 on the outer periphery of the plate cylinder 1, and a small-diameter portion thereof. Is a portion where the printing pressure is on, including when printing on the front side and when printing on the back side. The intermittent cam 67 uses the same material as the printing cam 27 in order to make it a common part with the printing cam 27. From the viewpoint of function, the formation range of the large diameter portion and the small diameter portion is the printing cam 27. Of course, it does not matter if it is not the same.

  FIG. 10 is an expanded view of the printing pressure range of the press roller 21 for easy understanding. In FIG. 10, an area portion of the front plate-making image 8A and an area portion of the back-side plate-making image 8B are formed on the divided plate-making master 8X wound around the opening portion 1a on the plate cylinder 1 (not shown). In addition, there is an unfinished blank intermediate unfinished area 8C between them. Here, the leading side of the divided plate-making master 8X, which is also called the leading edge blank portion sandwiched and fixed by the clamper 7 of the plate cylinder 1 (not shown in FIG. 10), is the left end side.

  The printing pressure range pattern for normal printing including single-sided printing is as shown in III. That is, the printing pressure range pattern III is applied to one side of the prepressed master 8Y by applying a printing pressure from the region portion of the front plate making image 8A to the region portion of the back plate making image 8B through the intermediate unmade region 8C. The printing pressure cam 27 is driven to rotate so that the small diameter portion of the printing pressure cam 27 faces the cam follower 24 so that the paper 36 is continuously pressed against the plate-making image 8YA.

  At the time of front surface printing, the printing pressure range pattern I is applied, and the printing pressure is set so that the small diameter portion of the printing pressure cam 27 faces the cam follower 24 so as to be printed corresponding to the region portion of the surface plate-making image 8A. On / off drive control of the second solenoid 77 is performed so that the large diameter portion of the intermittent cam 67 contacts the cam follower 24 so that the cam 27 is driven to rotate and then the printing pressure is released in the intermediate unfinished region 8C. Is done.

  At the time of printing on the back side, the printing pressure range pattern II is set, and the large-diameter portion of the intermittent cam 67 is in contact with the cam follower 24 so that the printing pressure is released in the region of the first front plate-making image 8A. 2 The solenoid 77 is controlled to be turned on / off, and then the printing pressure cam 27 is rotationally driven so that the small diameter portion of the printing pressure cam 27 faces the cam follower 24.

  The above can be summarized with reference to FIGS. 2 to 4 and 10 as follows. That is, a printing pressure range pattern I as a first printing pressure range pattern that applies printing pressure only to the surface region 1A corresponding to the surface plate-making image 8A in the divided plate-making master 8X on the plate cylinder 1, and on the plate cylinder 1 In the divided plate-making master 8X, a printing pressure range pattern II as a second printing pressure range pattern that applies a printing pressure only to the back surface area 1B corresponding to the back surface plate-making image 8B, and the back surface area 1B continuously from the front surface area 1A. One of at least three printing pressure range patterns and a printing pressure range pattern III as a third printing pressure range pattern for applying printing pressure can be selectively switched. The mechanism for selectively switching one of these three printing pressure range patterns is the printing pressure range variable means 28 described above.

  According to the present embodiment, since the printing pressure range variable means 28 is provided, the printing pressure on range is optimally set, and the printing pressure is turned on when there is no sheet and the press roller 21 It is possible to prevent a problem that the printed image is transferred to the outer peripheral surface and is stained with ink. Further, the printing pressure range varying means 28 is a unique component as shown in FIGS. 5 to 7, that is, a pair of printing cams 27 and 27 (hereinafter referred to as “a pair of printing pressure cams 27”), a pair of printing pressure ranges 27 Intermittent cam gears 65, 65 (hereinafter referred to as "a pair of intermittent cam gears 65"), a pair of intermittent cam drive gears 66, 66 (hereinafter referred to as "a pair of intermittent cam drive gears 66"), a pair of intermittent Cams 67, 67 (hereinafter referred to as “a pair of intermittent cams 67”), intermittent cam shaft 68, clutch gear 70, clutch body 71, sleeve 72, spring clutch 73, cam drive shaft 74, cam drive gear 75, stopper 76, the second solenoid 77, the spring 78, and the like, the above-described problems can be prevented with a relatively simple configuration. Further, even if the operation of the intermittent cam 67 becomes unstable via the second solenoid 77 due to, for example, external noise, the printing cam 27 that rotates in synchronization with the rotation of the plate cylinder 1 is provided. Since the press roller 21 is reliably separated from the plate cylinder 1 on the rear end side of the plate cylinder 1 by the printing pressure cam 27, the press roller 21 rides on the protruding portion of the clamper 7 of the plate cylinder 1. It is possible to prevent the 21 and the clamper 7 from being damaged (damaged).

  As described above, when expressed in a different way of view, the large-diameter portion of the intermittent cam 67 is brought into contact with the cam follower 24 at an arbitrary rotational position by appropriately controlling and adjusting the on / off operation of the second solenoid 77. Or the small diameter portion of the intermittent cam 67 can be opposed to each other in a non-contact state. In addition, only the rotation transmission means for driving the printing cam shaft 26 is removed, and the above-described first printing pressure range pattern I, second printing pressure range pattern II, and third printing pressure are used using the intermittent cam 67. It is also possible to control the on / off operation of the second solenoid 77 so as to conform to the range pattern III.

  In this embodiment, the intermittent cam 67 is rotated and held using a spring clutch 73 as a component of the printing pressure range varying means 28. Instead, the intermittent cam 67 is replaced with an electromagnetic clutch and an electromagnetic brake device. A method of rotating and intermittently holding so as to conform to a first printing pressure range pattern and a second printing pressure range pattern described later may be used. Alternatively, in place of the spring clutch 73 and the driving means (mainly the main motor 20), an intermittent cam 67 may be formed by using an electromagnetic clutch, an electromagnetic brake device, and a stepping motor. A method of rotating / intermittently maintaining a range pattern may be used.

  The printing pressure range varying means is not limited to this as long as the advantages of the printing pressure range varying means 28 are not so much desired. For example, FIG. A technique comprising the multi-stage cam (43), step cam (49) and press roller contact / separation mechanism (55) shown in FIG. When applied, for example, a cam plate set composed of a plurality of cams that can be moved by a screw shaft as disclosed in FIGS. 7 and 8 of JP-A-64-18683, and the screw shaft is rotated By applying a printing cam switching motor or the like to be driven, and for example, as shown in FIGS. 7 and 8 of JP-A-10-193767, etc. It may be a like applying the pressing range varying mechanism that can select a cam.

  As shown in FIG. 1, the paper discharge unit 19 is provided so as to be close to the outer peripheral surface of the plate cylinder 1, and a peeling claw 170 that peels the single-side printed paper 36 c from the plate-making master 8 </ b> Y on the plate cylinder 1. A separation fan 171 for blowing air between the front end portion of the single-side printed paper 36c separated by the nail 170 and the plate cylinder 1 to assist the separation action by the separation nail 170, and separation by the separation nail 170 and the separation fan 171. The sheet discharge conveyance device 152 that conveys one of the printed single-sided printed paper 36c and the double-sided printed paper 36b while sucking it, and the above-described discharge tray 172 are mainly configured.

  The peeling claw 170 is provided in the vicinity of the downstream in the printing nip portion formed by the press roller 21 being pressed against the outer peripheral surface of the plate cylinder 1. The peeling claw 170 is placed on the plate cylinder 1 in the vicinity of the outer peripheral surface of the plate cylinder 1 by a peeling claw displacing means (not shown) having a cam and a spring that are driven to rotate in synchronization with the rotation of the plate cylinder 1. A separation position for forcibly separating the single-sided printed paper 36c from the pre-printed master 8Y, and a non-peeling position for avoiding contact with the clamper 7 arrangement portion protruding from the outer peripheral surface of the plate cylinder 1 apart from the separation position It is configured to be freely displaceable between. The peeling fan 171 has a built-in fan drive motor that rotationally drives the peeling fan.

  As shown in FIGS. 1 to 4, the paper discharge conveying device 152 is disposed below the peeling claw 170 and on the left side of the switching guide 46, and after the paper discharge roller 154 as a driving roller, a driven roller The sheet discharge roller front 156, a sheet discharge belt 158 which is an endless belt, a suction fan 159 and the like are provided. A plurality of post-discharge rollers 154 have a roller shape, and are attached to a drive shaft 154a rotatably supported by the pair of casing side plates at a predetermined interval. A plurality of front discharge rollers 156 are also provided on the driven shaft 156a rotatably supported by the casing side plate pair at equal intervals with the rear 154 of each discharge roller. A paper discharge belt 158 is stretched around each paper discharge roller 154 and each paper discharge roller front 156 corresponding thereto. A drive gear or drive pulley (not shown) is attached to the drive shaft 154a (for example, the back side of the paper in FIGS. 1 to 4). It is connected to a paper discharge belt drive motor 153 via a driving force transmission means such as a stretched belt. Accordingly, the paper discharge belt 158 is rotationally driven by the paper discharge belt drive motor 153 in the direction of the arrow (counterclockwise) shown in FIG.

  A suction fan 159 is disposed below the discharge roller 154, the discharge roller front 156, and the discharge belt 158. The suction fan 159 has a built-in fan drive motor that rotationally drives the suction fan. The paper discharge conveyance device 152 sucks either the single-side printed paper 36c or the double-side printed paper 36b on each paper discharge belt 158 by the suction force of the suction fan 159, and rotates the rear 154 after each paper discharge roller. 1 in the direction of the arrow.

  In FIG. 16, the control target drive means of the paper discharge unit 19 including the fan drive motor of the separation fan 171, the paper discharge belt drive motor 153, and the fan drive motor of the suction fan 159 in the paper discharge unit 19 is collectively discharged. The driving means 127 is used.

  As shown in FIGS. 1 to 4, the switching guide 46 includes a printing nip portion 16 a serving as a print image forming portion in the printing portion 16 formed by pressing the press roller 21 against the plate cylinder 1 and paper discharge. It is disposed on a paper conveyance path to and from the conveyance device 152. The switching guide 46 is made of a plate material having substantially the same width as the plate cylinder 1 and the press roller 21, and its base end portion (downstream end portion in the paper transport direction X) is supported on the casing side plate so as to be rotatable by a predetermined angle. The free end portion (the upstream end portion in the paper transport direction X) is swingable about the shaft 46a. The outer peripheral surface of the switching guide 46 may be smoothly coated with a film having ink repellency and oil resistance, such as polytetrafluoroethylene resin.

  The switching guide 46 has a free end portion formed in an acute cross section when the solenoid 47 as the switching drive means shown in FIGS. 2 and 16 operates against the urging force of a tension spring as urging means (not shown). Are selectively positioned at a first displacement position indicated by a solid line and a second displacement position indicated by a two-dot chain line in FIG. The switching guide 46 is usually given a habit of swinging by the urging force of the tension spring at the first displacement position which is also the initial position shown in FIG. When the switching guide 46 occupies the first displacement position, the tip of the switching guide 46 comes close to the outer peripheral surface of the press roller 21 and does not interfere with the clamper 7 on the plate cylinder 1 and occupies the second displacement position. The tip of the plate cylinder 1 is placed close to the circumferential surface of the plate cylinder 1. The double-side printed paper 36b or the single-side printed paper 36c that has passed between the plate cylinder 1 and the press roller 21 is guided to the paper discharge unit 6 when the switching guide 46 occupies the first displacement position, The printed sheet 36a is delivered to the moving guide 81 while being guided by the switching guide 46 when the switching guide 46 occupies the second displacement position. The switching drive means for displacing the switching guide 46 between the first displacement position and the second displacement position is not limited to the combination of the solenoid 47 and the tension spring, and is driven by, for example, a stepping motor or a rotary solenoid. It may be.

  As shown in FIGS. 1 to 4, 7, and 8, the movement guide 81 is disposed between the discharge conveyance device 152 and the switching guide 46 and the refeed conveyance device 104. . The movement guide 81 sandwiches the leading end of the front surface printed paper 36a at a movement position P1 as a first position in the vicinity of the printing unit 16, and the second guide near the upstream side of the refeeding unit 45 lower than the movement position P1. It has a function and configuration as a sheet clamping means for opening the front end of the front surface printed sheet 36a at the initial position P2 as the position.

  The movement guide 81 includes a clamping table 81f that clamps and places the leading end of the front surface printed paper 36a, and a clamping table 81f on the downstream side in the traveling direction (conveying direction) of the front surface printed paper 36a fed from the printing nip 16a. A pair of end fences 81d as receiving portions with which the front end of the surface-printed paper 36a comes into contact, and a pair of both sides on the front side and the back side of the paper surface of the clamping table 81f, and integrally formed in the reciprocating direction. Four projections 81c as guided portions, clamp claws 81b as a clamping member that is openable and closable with respect to a clamping base 81f that grips and clamps the tip portion including the tip of the surface-printed paper 36a, and clamp claws A clamp shaft 81a that can be pivoted (rotated at a predetermined angle) for attaching and fixing the base end portion of 81b, and a clamp shaft 81a that can be pivoted (rotated at a predetermined angle). The pair of bearing brackets 81e shown in FIG. 8 that are integrally attached to both ends of the clamping table 81f and the free ends of the clamp claws 81b are pressed against the upper surface of the clamping table 81f. Is composed mainly of a torsion coil spring (not shown) as an urging means for urging in the direction indicated by, and a pair of upper and lower release levers 82 and a lower release lever 83 attached and fixed to the back side of the paper surface of the clamp shaft 81a. ing.

  The movement guide 81 is formed in a substantially L-shaped cross section by a clamping base 81f and an end fence 81d. The four protrusions 81c are loosely fitted in the guide grooves 88 formed in the housing side plate pairs 130a and 130b shown in FIG. The clamp claws 81b are inclined with an acute rising angle with respect to the advancing direction (conveying direction) of the surface-printed paper 36a fed from the printing nip portion 16a, and a plurality of base ends thereof are attached and fixed to the clamp shaft 81a. The free end is formed into an acute angle. For example, about 2 to 3 clamp claws 81b are arranged near the center in the width direction of the surface-printed paper 36a, and are made of a thin plate member made of metal or resin having a predetermined width in the same width direction. A mounting portion 84 shown in FIG. 8 is integrally provided at a lower portion of the clamping table 81 f on the back side of the paper surface, and the mounting portion 84 is fixed to a timing belt 89 that constitutes the moving means 87. The release lever 82 and the release lever lower 83 are formed of a plate-like member. Note that the protrusion 81c is not limited to being formed integrally with the holding base 81f, but may be formed of a roller that can roll on the inner wall of the guide groove 88 with little frictional resistance.

  According to the present embodiment, the front surface printed paper 36a is conveyed by including the clamp claw 81b inclined with an acute rising angle with respect to the traveling direction of the front surface printed paper 36a fed from the printing nip portion 16a. When a load or the like is applied in the direction in which the surface-printed paper 36a is pulled out at a time or the like, a clamping force (pressing force) is increased, that is, a moment for rotating the clamp claw 81b counterclockwise acts. (Pushing force) can be increased to prevent the sheet 36a from coming off, and the clamping force as a biasing force of a torsion coil spring (not shown) can be set small, and it can be constructed at low cost without having to be made firmly. .

  As shown in FIG. 8, the moving means 87 is disposed outside the casing side plate 130b on the back side of the page, and has a function and configuration for reciprocating the moving guide 81 between the moving position P1 and the initial position P2. Have The moving means 87 has an arcuate guide groove 88 formed so as to be inclined to the lower left so as to be substantially the same as the transport drop path of the front surface printed paper 36a, and penetrated through the housing side plate pair 130a, 130b. A toothed drive pulley 90 rotatably supported by a housing side plate 130b near the downstream end in the traveling direction (conveying direction) of the surface-printed paper 36a in the groove 88, and a surface in the guide groove 88 A toothed driven pulley 91 having a shaft 91a rotatably supported by a housing side plate 130b in the vicinity of the upstream end in the traveling direction (conveying direction) of the printed paper 36a, a drive pulley 90, and a driven pulley 91 A timing belt 89 that is stretched between and stretched therebetween, and is rotatably supported with a shaft (not shown) on the housing side plate 130b so as to abut against and apply tension to the timing belt 89. A plurality of tension rollers 95, a drive gear 92 attached / fixed to the shaft 90a of the drive pulley 90, and a drive means capable of forward / reverse rotation attached / fixed to the casing side plate 130b near the shaft 90a of the drive pulley 90. And a motor gear 93 that is attached and fixed to the output shaft 94a of the drive motor 94 and meshes with the drive gear 92.

  The timing belt 89 is connected and fixed to the moving guide 81 via an attachment portion 84 formed integrally with the lower portion of the holding base 81 f of the moving guide 81. The drive motor 94 is composed of a stepping motor, for example. As described above, the driving motor 94 is the driving means of the moving means 87, the guide groove 88 is the guiding means of the moving means 87, and the timing belt 89, the driving pulley 90, the driven pulley 91, the driving gear 92, and the motor gear 93 are the driving motor 94. The driving force transmitting means for transmitting the driving force to the movement guide 81 is configured.

  As shown in FIG. 3, FIG. 8, FIG. 9 and FIG. 9 in which the moving guide 81 clamps the leading end of the front surface printed paper 36a through the driving force transmitting means by forward / reverse driving of the driving motor 94, as shown by the solid line in FIG. In the vicinity of the movement position P1 (first position) that is in the vicinity of the printing unit 16 and in the vicinity of the upstream side of the refeeding means 45 that is lower than the movement position P1 (in the vicinity of the rear upper portion of the conveyance roller 107 of the refeeding conveyance device 104). In order to selectively occupy the initial position or the standby position (second position) indicated by a solid line in FIGS. 1 and 2 and a two-dot chain line in FIGS. Reciprocates. In the vicinity of the drive pulley 90, a home position sensor 85 that detects when the movement guide 81 occupies the second position, which is the home position (initial position), is disposed.

  As shown in FIG. 9, the release cam 98 and the torsion coil spring are attached to the torsion coil spring by contacting the lower release lever 83 of the movement guide 81 when the movement guide 81 occupies the movement position P1 indicated by the solid line. After the clamp pawl 81b is pivoted clockwise (predetermined angle rotation) via the release lever lower 83 and the clamp shaft 81a against the force and once released, the movement guide 81 moves from the movement position P1 to a two-dot chain line. When the movement toward the initial position P2 shown in FIG. 2 is started, the abutment state with the release lever lower 83 is released, and the clamping claw 81b is swung counterclockwise by the biasing force of the torsion coil spring. It has a function as an operation timing control unit that operates so as to sandwich the front end of the front surface printed paper 36a. As shown in FIG. 9, when the movement guide 81 occupies the initial position P2, the release pin 99 is released against the biasing force of a torsion coil spring (not shown) by coming into contact with the upper release lever 82 of the movement guide 81. It has a function as an operation timing control unit that operates to swing the clamp claw 81b clockwise via the lever upper 82 and the clamp shaft 81a to open the front end of the surface printed paper 36a.

  According to the present embodiment, the provision of the release cam 98 has the following advantages over the case where the release cam 98 is not provided. That is, for example, when the movement guide 81 occupies the movement position P1, the front end of the surface-printed paper 36a overcomes the urging force of a torsion coil spring (not shown) by the conveyance force applied by the printing nip portion 16a, and the clamp claw 81b is rotated clockwise. In the case where the release cam 98 is removed so as to be inserted into the open part (the open part between the tip of the clamp claw 81b and the upper surface of the clamping base 81f) by swinging, Even if the urging force of the coil spring is set according to a sheet with low stiffness, it is assumed that the leading end of the sheet is deformed or the sheet clamping force becomes unstable. On the other hand, according to the present embodiment, when the movement guide 81 occupies the movement position P1, the front end of the surface printed paper 36a is conveyed by the printing nip portion 16a by the action of the release cam 98 described above. Because it is smoothly inserted into the open part (open part between the tip of the clamp claw 81b and the upper surface of the clamping table 81f) by force, the surface printed paper is not affected by the strength of the paper. The tip of 36a can be securely clamped and clamped between the tip of the clamp claw 81b and the upper surface of the clamping table 81f, so that the surface-printed paper 36a is in a stable state without meandering or skewing. Can be transported satisfactorily at the same time, and the printing image can be prevented from tilting when printing on the back side, or the resist can be prevented from deteriorating due to tilting. It is. In addition, the opening time when the front end of the surface-printed paper 36a is clamped can be set to a certain extent by devising and adjusting the shape of the release cam. This can be performed without resistance, and the front end of the surface-printed paper 36a can be favorably clamped.

  By the action and action of the release pin 99, when the movement guide 81 occupies the initial position P2, the front end portion of the surface printed paper 36a held between the front end of the clamp claw 81b and the upper surface of the holding base 81f is released. The front surface printed paper 36a falls from the rear end thereof onto the conveyance belt 108 of the refeed conveyance apparatus 104, and is temporarily sucked and held on the conveyance belt 108 by the suction force of the suction fan 109 operating at this time. After that, it is conveyed by the rotational drive of the conveyor belt 108. Needless to say, the length of the transport belt 108 and the initial position P2 of the movement guide 81 are set to have optimum lengths depending on the length of the paper 36 used for duplex printing in the paper transport direction X. .

  The plate removal unit 17 includes an upper plate removal member 160, a lower plate removal member 161, a plate removal box 162, a compression plate 163, and the like. The upper plate removal member 160 includes a driving roller 164, a driven roller 165, an endless belt 166, and the like. The drive roller 164 is driven to rotate clockwise in FIG. 1 by a plate discharge driving means 126 (see FIG. 16) including a plate discharge motor (not shown), whereby the endless belt 166 moves in the arrow direction in FIG. The lower plate removal member 161 includes a driving roller 167, a driven roller 168, an endless belt 169, and the like. The driving roller 167 is driven to rotate in the clockwise direction in FIG. 1 by transmitting the driving force of the above-mentioned plate discharging motor that rotates the driving roller 164 by driving force transmitting means (not shown) such as a gear or a belt. The endless belt 169 moves in the direction of the arrow in FIG. Further, the lower plate discharging member 161 is movably provided by a moving unit (not shown) included in the plate discharging driving unit 126, and an endless belt 169 positioned on the outer peripheral surface of the driven roller 168 and the position shown in the figure is the plate cylinder 1. And a position that abuts on the outer peripheral surface.

  The plate removal box 162 stores a used master therein and is detachably attached to the main body frame 130. The compression plate 163 is supported by the main body frame 130 so as to be movable up and down so that the used master carried by the upper plate discharging member 160 and the lower plate discharging member 161 is pushed into the plate discharging box 162. It is moved up and down by lifting means (not shown) including the lifting motor included.

  In FIG. 16, the discharge target drive means 126 is collectively referred to as the control target drive means of the discharge plate section 17 including the discharge motor, the moving means, and the lifting motor of the discharge section 17.

  As shown in FIGS. 1, 11, and 12, the paper feed unit 30 contacts the paper feed tray 35 that can stack and lift the paper 36 so that the paper 36 can be lifted and the paper 36 on the paper feed tray 35. The sheet feeding roller 33 and the separating member 34 as sheet feeding means for separating and transporting the sheet 36 one by one toward the nip portion of the pair of registration rollers 31a and 31b (hereinafter abbreviated as "registration roller pair 31"). A pair of registration rollers serving as registration means for feeding the paper 36 at a later-described timing between the outer peripheral surface of the plate cylinder 1 and the press roller 21. 31 and so on.

  The paper feed tray 35 is provided with a drive device (not shown) including a paper feed tray lifting / lowering motor (not shown) that moves the paper feeding tray 35 up and down as a lifting means (not shown). The upper level always comes into contact with the paper feed roller 33 with a predetermined pressing force (pressing force capable of transporting the paper 36), that is, in contact with the increase / decrease of the paper 36 with a pressing force within a range in which the paper 36 can be transported. It is moved up and down while maintaining the state. The paper feed tray 35 has a structure that can use many paper types and paper sizes, and a stencil printing apparatus capable of stacking 500 sheets or more of paper with a paper loading capacity of, for example, paper size A3 (vertical) or A4. It has a structure suitable for.

  As shown in FIG. 13, a pair of side fences 113 a and 113 b for positioning and aligning both side edges of the paper 36 according to the paper size are disposed in the paper feed tray 35 movably in the paper width direction Y. . FIG. 13 shows the paper size detecting means 112. This paper size detecting means 112 determines the paper size of the paper 36 in conjunction with the movement of the side fence pair 113a, 113b in the paper width direction Y.

  The paper size detecting means 112 includes a pair of movable side fences 113a and 113b, a pinion 116 rotatably attached to a stationary member disposed at the lower part of the paper feed tray 35, and a lower part of the side fence 113a. A rack portion 115 formed on the end edge portion and meshed with the pinion 116, a rack portion 114 formed on the lower edge portion of the side fence 113 b and opposed to the rack portion 115 and meshed with the pinion 116, and a rack portion 114 of the side fence 113 b A blocking portion 114a having a plurality of notches protruding downward and bent at an opposed lower end edge portion and notched at an appropriate interval, and fixed to the stationary member of the paper feed tray 35 at an appropriate interval. A plurality (two in this case) of lateral size detection sensors 118 that selectively engage with the shielding portions 114a, respectively. , 118b and a plurality (three in this case) of vertical size detection sensors 119a, 119b, and 119c fixed at an appropriate interval in the paper feed direction X of the stationary member of the paper feed tray 35. ing.

  Each of the horizontal size detection sensors 118a and 118b is a transmissive optical sensor, and detects the length / size of the paper 36 in the paper width direction Y by selectively engaging with the blocking portion 114a. The vertical size detection sensors 119a, 119b, and 119c are reflection type optical sensors. The vertical size detection sensors 119a, 119b, and 119c detect the length and size of the paper 36 in the paper feeding direction X. The horizontal size detection sensors 118a and 118b and the vertical size detection sensors 119a, 119b, and 119c are collectively referred to as a paper size detection sensor 117. The paper size detection sensor 117 is electrically connected to the control device 100 to be described later, and the CPU 101 of the control device 100 determines the paper 36 by combining the size signal data detected by the paper size detection sensor 117. This determines the paper size. The paper size detection sensor 117 has a function as a paper size detection unit that detects the paper size of the paper 36, and the vertical size detection sensor 119 a also has a function as a paper presence / absence detection unit that detects the presence / absence of the paper 36.

  For the sake of simplicity, two horizontal size detection sensors for detecting the length and size of the paper 36 in the paper width direction Y and two vertical size detection sensors for detecting the size of the paper 36 in the paper feeding direction X are Although three are provided, more sizes may be arranged so that more sizes can be detected. As details of such a paper size detection method, for example, a technique disclosed in Japanese Patent Laid-Open No. 9-30714 can be cited. The paper size detection method is not limited to the method described above, and other methods, for example, the slider slides in conjunction with a paper feed side plate (side fence) and is arranged according to the paper size. It may be one that detects by contacting / connecting with each terminal of the paper size detection plate.

  As shown in FIGS. 1 and 12, the paper feed roller 33 is formed integrally with a metal paper feed roller shaft 33a, and one end of the paper feed roller shaft 33a is rotatable on the casing side plate. It is supported. The surface of the paper feed roller 33 is formed of at least a high friction resistance member such as rubber. A toothed paper feed roller pulley 39 is attached to one end of the paper feed roller shaft 33a. Between the paper feed roller shaft 33a and the paper feed roller pulley 39, a one-way clutch for rotating the paper feed roller 33 so as to transport the paper 36 only in the paper transport direction X, that is, rotating it clockwise only (see FIG. Not shown). The separation member 34 has a member called a separation pad that is made of rubber or resin having a high friction coefficient with respect to the paper 36 and that can contact the paper feed roller 33. This separation pad is urged in a direction to be pressed against the paper feed roller 33 by a compression spring (not shown) as urging means.

  As shown in FIG. 12, below the paper feed roller pulley 39, a paper feed motor 37 as a paper feed drive unit that rotationally drives the paper feed roller 33 is fixed to the casing side plate. The paper feed motor 37 is composed of, for example, a stepping motor as a motor driven by pulse input, and a toothed paper feed motor pulley 38 is fixed on the output shaft thereof. A toothed paper feed motor belt 40 is stretched between the paper feed roller pulley 39 and the paper feed motor pulley 38. As a result, the paper feed roller 33 and the paper feed motor 37 are in a rotational driving force transmission relationship between the paper feed motor belt 40 and the one-way clutch.

  As shown in FIGS. 1 and 12, the registration roller upper portion 31a is integrally formed with a metal registration roller shaft, and the registration roller lower portion 31b is integrally formed with a metal registration roller shaft 31c. Both end portions of the housing are rotatably supported by the casing side plate. A toothed registration roller pulley 43 is attached to one end of the lower registration roller shaft 31c. The lower registration roller 31b is supported by the casing side plate through a registration roller shaft 31c so as not to move and to rotate freely. The upper registration roller 31a is provided so as to be able to contact and separate through a registration roller contacting / separating means (not shown) so as to come into contact with the lower registration roller 31b at a predetermined timing.

  As shown in FIGS. 1 and 12, a registration motor 41 as registration driving means for rotationally driving the registration roller pair 31 is fixed to the casing side plate below the registration roller lower 31b. The registration motor 41 includes, for example, a stepping motor as a motor driven by pulse input, and a toothed registration motor pulley 42 is fixed to the output shaft thereof. Between the registration roller pulley 43 and the registration motor pulley 42, a toothed registration motor belt 44 is stretched. Thus, the lower registration roller 31 b and the registration motor 41 are in a rotational driving force transmission relationship via the registration motor belt 44.

  In FIG. 1, a sheet for detecting the leading edge and the trailing edge of the sheet 36 fed from the registration roller pair 31 is disposed on a sheet conveyance path XA from the plate cylinder 1 and the press roller 21 to the nip portion of the registration roller pair 31. A paper detection sensor 32 is provided as detection means. In the paper detection sensor 32, the paper 36 stays in the paper transport path XA on the upstream side of the arrangement position of the paper detection sensor 32 (position where the leading edge of the paper 36 can be detected) (jamming or the like occurs). It also has a function to detect. The paper detection sensor 32 is a reflective optical sensor.

  In FIG. 16, control target drive means of the paper feed unit 30 including the paper feed tray lifting / lowering motor, the paper feed motor 37, and the registration motor 41 of the paper feed unit 30 are collectively referred to as a paper feed drive unit 125.

  The paper feed driving means for rotationally driving the paper feed roller 33 is not limited to the paper feed motor 37 and the like. It may be configured to be driven to rotate at a predetermined timing synchronized with the plate cylinder 1. Similarly, the registration driving means for rotationally driving the registration roller pair 31 is not limited to the registration motor 41 or the like. The lower registration roller 31b as a driving roller rotates at a predetermined timing synchronized with the plate cylinder 1, and the upper registration roller 31a as a driven roller pressed against the lower registration roller 31b causes the plate cylinder 1 in the printing unit 16 to move. The paper 36 or the surface-printed paper 36a may be fed at a predetermined timing toward the printing nip portion 16a formed by press contact between the outer peripheral surface and the outer peripheral surface of the press roller 21.

  As shown in FIG. 14, the image reading unit 18 includes the above-described document receiving table 134 on which a plurality of documents 133 are stacked, a contact glass 135 as a reading unit on which the document 133 is placed, and a document that conveys the document 133. A pair of transport rollers 136 and a document transport roller 137, guide plates 138 and 139 for guiding the transported document 133, a plurality of document transport belts 140 that transport the document 133 along the contact glass 135, and the read document 133 A document tray 141, a pressure plate 142 that supports each member except the contact glass 135, and is provided so as to be able to contact / separate / open / close with respect to the contact glass 135, and scans and reads an image of the document 133 while illuminating it. Reflection mirrors 143 and 144 and a fluorescent lamp 145 for focusing the reflected light of the scanned and read image That a lens 146, and a like image sensor 147 having a CCD (charge coupled device) or the like for processing the reflected light of the focused image.

  In the above configuration, the original 133 is placed on the contact glass 135 (reading unit) by the original receiving tray 134, the original conveying roller pair 136, the original conveying roller 137, the guide plates 138 and 139, the original conveying belt 140, and the original tray 141. An automatic document feeder (hereinafter referred to as “ADF”) 148 is configured as an automatic document feeder that feeds sheets one by one. Further, a scanner device 132 as a document reading unit that reads an image of the document 133 on the contact glass 135 (reading unit) by the contact glass 135, the reflecting mirrors 143 and 144, the fluorescent lamp 145, the lens 146, and the image sensor 147, Each of the reflecting mirrors 143 and 144, the fluorescent lamp 145, and the lens 146 constitutes a document scanning optical system.

  The document transport roller pair 136, the document transport roller 137, and the document transport belt 140 are driven by a document transport motor (not shown). The scanner device 132 is provided with a scanner motor (not shown) that drives the scanner device 132. The image sensor 147 performs photoelectric conversion corresponding to the received reflected light, and inputs an image signal obtained thereby to the A / D conversion unit.

  In the vicinity of the lower part of the contact glass 135, a document vertical size detection sensor 149a that detects the length of the document in the transport direction (left-right direction) in the view of the document 133 to be transported or the document not shown placed on the contact glass 135. 149b, and a document lateral size detection sensor (not shown) for detecting the length of the front side and the back side of the paper in the drawing of the document 133 (not shown) placed on the document 133 or the contact glass 135 to be conveyed. . The document vertical size detection sensors 149a and 149b and the document horizontal size detection sensor detect the sizes of the document 133 to be conveyed or the document (not shown) placed on the contact glass 135. These are hereinafter referred to as the document size detection sensor 149. Collectively.

  The original size detection sensors 149a and 149b of the original size detection sensor 149 and the original horizontal size detection sensor are both reflective optical sensors, and the outline and size of the original 133 and the original are determined depending on the amount of reflection on the contact glass 135. The presence or absence of 133 is detected. A signal from the document size detection sensor 149 is input to the control device 100 described later. Based on the signal from the document size detection sensor 149, the control device 100 determines and recognizes the document size (when it is the same size, it is also the size of the plate-making image to be made / formed on the master 8). A document detection sensor 131 that detects the document 133 remaining on the document tray 134 is disposed below the document tray 134. The document detection sensor 131 outputs a signal to the control device 100 when the document 133 on the document tray 134 runs out.

  In FIG. 16, the control target drive unit of the paper discharge unit 19 including the scanner motor and the document transport motor of the image reading unit 18 is collectively referred to as a reading drive unit 128.

  Next, a detailed configuration of the operation panel 173 will be described with reference to FIG. The operation panel 173 is for instructing the double-sided stencil printing apparatus 200 to perform a predetermined operation or the like, and is disposed in the vicinity of the image reading unit 18 shown in FIG. The operation panel 173 has a plate making start key 174, a printing start key 175, a test printing key 176, a continuous key 177, a clear / stop key 178, a numeric key 179, an enter key 180, a program key 181, a mode clear key 182 on the upper surface of the operation panel 173. Speed setting key 183, 4-direction key 184, paper size setting key 185, cleaning key 186, plateless cleaning key 186A, double-sided printing key 187, single-sided printing key 188, display device 189 consisting of 7-segment LED (light emitting diode), LCD A display device 190 including a (liquid crystal display device) is included.

  The plate-making start key 174 is pressed when the double-sided stencil printing apparatus 200 performs a plate-making operation. When the plate-making start key 174 is pressed, a plate-making operation is performed after a plate-discharging operation and a document reading operation are performed. The printing operation is performed, and the double-sided stencil printing apparatus 200 enters a print standby state. The print start key 175 is pressed when the duplex stencil printing apparatus 200 performs a printing operation. When the duplex start stencil printing apparatus 200 enters a print standby state and various printing conditions are set, the print start key 175 is pressed. A printing operation is performed. The trial printing key 176 is pressed when the double-sided stencil printing apparatus 200 performs trial printing, and only one sheet is printed by pressing the trial printing key 176 after various conditions are set. The continuous key 177 is pressed before the plate making start key 174 is pressed when performing the plate making operation and the printing operation continuously. After the continuous key 177 is pressed, the plate making start key 174 is pressed after the printing conditions are input. Then, the printing operation is performed following the plate discharging operation, the document reading operation, and the plate making operation.

  The clear / stop key 178 is pressed when the operation of the double-sided stencil printing apparatus 200 is stopped or when the number is cleared. The numeric keypad 179 is used for inputting numerical values. The enter key 180 is pressed when setting a numerical value or the like during various settings, and the program key 181 is pressed when registering or calling a frequently performed operation. The mode clear key 182 clears various modes. Press to return to the initial state. The print speed setting key 183 is pressed when setting the print speed prior to the printing operation, and when it is desired to obtain a darker image or when the ambient temperature is low, the print speed is slow and a lighter image is desired. Or when the ambient temperature is high, the printing speed is set fast. The four-way key 184 has an up key 184a, a down key 184b, a left key 184c, and a right key 184d. When adjusting the image position during image editing or when selecting numerical values or items at various settings, etc. Pressed. The paper size setting key 185 is pressed when an arbitrary paper size is input, and the paper size input with the paper size setting key 185 has priority over the paper size detected by the paper size detection sensor 73.

  The cleaning key 186 is a double-sided print image formed on the back side of the same sheet as the front-side printed sheet 36a or the printing nip part 16a of the printing unit 16 in a state where the plate cylinder 1 is wound with the divided plate-making master 8X. The printing unit 16 is configured so that the same sheet as the printed sheet 36b is repeatedly re-fed in the main body frame 130 and pressed a predetermined number of times between the plate cylinder 1 and the press roller 21 and then discharged to the sheet discharge unit 19. The refeed unit 45, the switching guide 46, and the moving unit 87 function as a refeed cleaning mode setting unit that sets a refeed cleaning mode in which each control target drive unit shown in FIG.

  The plate-making cleaning key 186A is in a state in which the plate cylinder 1 is wound with the unprinted master 8; 16 is operated so that the plate making unit 15 and the printing unit 16 shown in FIG. 16 are operated, and then the same sheet 36 fed from the sheet feeding unit 30 is printed on the surface 36a. The plate cylinder 1 and the press roller while re-feeding the same paper as the double-side printed paper 36b on which the printed image is formed on the back surface thereof at the printing nip portion 16a of the printing unit 16 in the main body frame 130 Each of the control target drive units shown in FIG. 16 of the printing unit 16, the refeed unit 45, the switching guide 46, and the moving unit 87 is operated so as to be discharged to the paper discharge unit 19 after being pressed a predetermined number of times with the control unit 21. No plate making refeed Functions as a non-plate-making refeed cleaning mode setting means for setting a leaning mode.

  Both the cleaning key 186 and the plate-free cleaning key 186A have an LED (not shown) built therein. When each of the keys 186 and 186A is pressed, each LED is turned on to indicate that the refeed cleaning mode and the non-plate refeed cleaning mode are set. Of course, the LEDs may be arranged separately in the vicinity of the keys 186 and 186A.

  The double-sided printing key 187 is pressed before the plate making start key 174 is pressed when the double-sided stencil printing apparatus 200 performs a double-sided printing operation. Is displayed indicating that the duplex printing mode is set. Similarly to the double-sided printing key 187, the single-sided printing key 188 is pressed before pressing the plate making start key 184 when the double-sided stencil printing apparatus 200 performs a single-sided printing operation. The arranged LED 188a is turned on to indicate that the single-sided printing mode is set. In the double-sided stencil printing apparatus 200, the LED 188a is lit in an initial state after turning on a power switch (not shown), and is in a single-sided printing mode setting state.

  The display device 189 mainly displays numbers such as the number of printed sheets. The display device 190 has a hierarchical display structure. By selecting and pressing selection setting keys 190a, 190b, 190c, and 190d provided below the display device 190, various modes such as scaling and position adjustment can be entered. It can be changed and set in each mode. The display device 190 displays the status of the double-sided stencil printing device 200 such as “can be made / printed” as shown in the figure, warnings such as plate-making or discharge jam, paper feed or paper discharge jam, Supply instructions for supplies such as paper, master and ink are also displayed.

  Next, the main control configuration of the double-sided stencil printing apparatus 200 will be described with reference to FIG. In FIG. 16, the control device 100 has a function and configuration as control means for controlling mainly a document reading operation, plate making / plate feeding operation, paper feeding operation, and printing operation of the double-sided stencil printing apparatus 200. The control device 100 includes a CPU 101 (central processing unit), an I / O (input / output) port (not shown), a ROM 102 (read-only storage device), a RAM 103 (read / write storage device), a timer with a battery (not shown), and the like. And a microcomputer having a configuration in which they are connected by a signal bus (not shown).

  As shown in FIG. 1, the control device 100 is provided in a control board arrangement section in the main body frame 130. The CPU 101 of the control device 100 (hereinafter, sometimes simply referred to as “control device 100” for the sake of simplicity) receives various signals from the operation panel 173 and the above-described various sensors provided on the main body frame 130. Based on the detection signal and the operation program called from the ROM 102, the main motor 20 of the printing unit 16, the first solenoid 62, the second solenoid 77, the plate making unit 15, the paper feeding unit 30, the plate discharging unit 17, the paper discharging unit 19, Each control target drive unit provided in the image reading unit 18, a press roller drive motor 55 provided in the refeed unit 45, a suction fan 109 of the refeed conveyance device 104, a belt drive motor 105, and a solenoid of the switching guide 46 47, controls the operation of the drive motor 94 provided in the moving means 78, etc., and operates the entire duplex stencil printing apparatus 200 Control to. The control device 100 also grasps the rotational position of the plate cylinder 1 based on various plate cylinder position signals from the plate cylinder position detection sensor 29 shown generally in FIG.

  Based on the refeed cleaning mode setting signal from the cleaning key 186, the control device 100 executes the refeed cleaning mode described above to execute the printing unit 16, the refeed unit 45, the switching guide 46, and the moving unit 87. It has a function as a control means which controls each control object drive means.

  The control device 100 performs the plate making refeed cleaning mode described above based on the plate making refeed cleaning mode setting signal from the plate making cleaning key 186A so as to execute the plate making refeed cleaning mode described above. It has a function as a control means which controls each control object drive means of the means 45, the switching guide 46, the moving means 87, and the non-plate making plate feeding means described later. The control device 100 also has a function of controlling the non-plate making plate feeding means so that the plate making master 8 is automatically fed to the plate cylinder 1.

  The ROM 102 stores an operation program for the entire duplex stencil printing apparatus 200, necessary data, and the like, and this operation program is appropriately called by the CPU 101. The RAM 103 has a function of temporarily storing the calculation result of the CPU 101, a function of storing data signals and ON / OFF signals set and input from various keys and various sensors on the operation panel 173 as needed.

  Based on the above-described configuration, the operation including the operation procedure of the double-sided stencil printing apparatus 200 in the present embodiment will be described in detail with reference to FIGS. Since this operation is performed under the control of the control device 100, when explaining detailed operations such as activation, operation, and stop of actuators (control target drive means) such as various motors and various solenoids, the control device 100 The expression based on the command or the command signal is omitted as much as possible.

(Operation example 1)
First, an operation example 1 in which the simplex printing mode is set and the simplex printing is performed will be described. The operation example 1 is substantially the same as the operation of performing single-sided printing with a conventional stencil printing apparatus, and the printing pressure range pattern III is used. Therefore, the printing pressure cam shaft 26 and the printing pressure cam 27 for normal printing are used among the components of the printing pressure range varying means 28, and the other components shown in FIGS. 5 to 7 are not used. . In the first operation example, in order to facilitate understanding of each operation, the A3 size is used as the master size, and the A3 size is used as the document size and the paper size.

  The user loads A3 size paper 36 as a paper size used for printing on the paper feed tray 35, opens the pressure plate 142, and places an A3 size document to be printed on the contact glass 135, and then again. The pressure plate 142 is closed. Thereafter, after setting the plate making conditions using various keys on the operation panel 173, the single-sided printing key 188 is pressed to set the single-sided printing mode, and the plate-making start key 174 is pressed.

  The user confirms the single-sided printing mode by turning on the LED 188a, and then presses the plate making start key 174. When the plate making start key 174 is pressed, a paper size detection signal is sent from the paper size detection sensor 117 and a document size detection signal is sent from the document size detection sensor 149 to the control device 100. Compare each signal. At this time, if the paper size and the document size are the same, the image reading operation is immediately performed. If the paper size and the document size are different, the control device 100 displays the fact on the display device 190 and pays attention to the user. Prompt. When the paper size and the document size are different, enlargement / reduction scaling may be automatically performed according to a command from the control device 100 to match the document size and the image size.

  As described above, in the single-sided printing mode setting state, the switching guide 46 is stopped and held at the first displacement position (initial position) shown in FIG. When a plate making start key 174 is pressed to generate a start signal and this is input to the control device 100, a series of operations from plate discharge to paper discharge are automatically performed. Prior to this, the paper feed tray raising / lowering motor is turned on to raise the paper feed tray 35 and the uppermost paper 36 abuts the paper feed roller 33 to turn on a paper feed position detection sensor (not shown). When the control device 100 determines that the uppermost paper 36 is ready to be fed by detection, the paper feeding device 30 enters a paper feed standby state.

  First, in the plate removal unit 17, a plate removal operation for peeling the used master from the outer peripheral surface of the plate cylinder 1 is performed. When the plate making start key 174 is pressed, the plate cylinder 1 starts rotating. When the plate cylinder 1 reaches the home position at which the clamper 7 is almost directly above, a home position signal is sent from the home position sensor to the control device 100. Sent. Receiving the home position signal, the control device 100 measures the number of pulses generated by the encoder (not shown) based on the home position, and the tip of the used master wound around the outer peripheral surface of the plate cylinder 1 is the driven roller 168. When it is determined that the predetermined plate discharging position corresponding to the endless belt 169 located on the outer peripheral surface of the main motor 20 is reached, the operation of the main motor 20 is stopped.

  When the main motor 20 is stopped and the plate cylinder 1 is stopped at a predetermined plate discharge position, the plate discharge driving means 126 is operated to rotate the drive rollers 164 and 167 and the lower plate discharge member 161 is moved to the plate cylinder 1 side. The endless belt 169 that moves and is positioned on the outer peripheral surface of the driven roller 168 comes into contact with the used master. When the main motor 20 is started following the operation of the plate discharge driving means 126, the used master scooped up from the outer peripheral surface of the plate cylinder 1 by the rotation of the plate cylinder 1 and the movement of the endless belt 169 is the lower plate discharging member. 161 and the upper plate removal member 160 are nipped and conveyed and peeled from the outer peripheral surface of the plate cylinder 1. The peeled used master is discarded in the discharge box 162 and then compressed by the compression plate 163.

  Even after all the used masters are peeled off from the outer peripheral surface, the plate cylinder 1 continues to rotate, and stops until the clamper 7 rotates to a predetermined plate feed standby position located substantially directly above. When the plate cylinder 1 stops at the plate feeding standby position, an opening / closing device (not shown) is operated to open the clamper 7, and the double-sided stencil printing apparatus 200 enters a plate feeding standby state.

  In parallel with the above plate removal operation, a document image reading operation is performed by the image reading unit 18. The original image is read by reflecting the reflected light illuminated by the fluorescent lamp 145 by the respective reflecting mirrors 143 and 144, and the reflected light related to the read original image is focused by the lens 146 and then image sensor 147. And is photoelectrically converted. The photoelectrically converted electrical signal is input to the A / D converter (not shown) in the main body frame 130, and then passed through a plate making control device (not shown) (which may be arranged in the control device 100). It is transmitted to a thermal head drive circuit (not shown).

  In parallel with the plate discharging operation and the image reading operation, the plate making unit 15 performs the plate making operation. That is, a digital image signal for controlling the heat generation of the heat generating elements of the thermal head 11 is transmitted to the thermal head 11 via the plate making control device (not shown) and the thermal head driving circuit. As a result, the numerous heating elements of the thermal head 11 are energized in pulses in the main scanning direction to selectively generate heat, and the master transport motor 10 is driven to rotate, whereby the platen roller 9 and the transport roller pair are driven. 13 starts rotating, and the thermoplastic resin film portion of the master 8 is selectively heated and punched according to image information while the master 8 is pulled out from the master roll 8a and is transported in the master transport direction X1.

  Then, the leading end of the master-made master 8Y is inserted between the clampers 7 which are guided by the master guide plate 14 and expanded with respect to the stage 6, and the number of steps of the master transport motor 10 reaches a certain set value, When it is determined that the leading end of the master-making master 8Y has reached between the stage 6 and the clamper 7, the clamper 7 is closed by the opening / closing device, and the leading-end of the master-making master 8Y is between the stage 6 and the clamper 7. Adsorbed and pinched by

  After clamping the front end of the master 8Y, the plate cylinder 1 resumes rotating at a peripheral speed substantially the same as the master transport speed by the rotation of the main motor 20, and the master 8Y is subjected to the platen roller 9 and the transport roller pair 13. Is fed to be wound around the outer peripheral surface of the plate cylinder 1. When it is determined that the plate making to the master 8 and the carrying of the set amount of the plate-making master 8Y have been completed by the rotation driving of the master carrying motor 10 by a predetermined number of steps, the cutter 12 is operated to cut the plate-making master 8Y. At the same time, the rotation of the platen roller 9 and the conveyance roller pair 13 is stopped by stopping the rotation of the master conveyance motor 10. When the rear end of the cut master 8Y is drawn out of the plate making unit 15 by the rotation of the plate cylinder 1 and completely wound around the outer peripheral surface of the plate cylinder 1, the master 8Y is transferred to the plate cylinder 1. When the winding of is finished, the plate feeding operation is finished.

  When the winding of the master-making master 8Y around the plate cylinder 1 is completed, the plate cylinder 1 starts to rotate at a predetermined peripheral speed in the direction of the arrow shown in FIG. Is done. Note that until the leading edge of the paper 36 crosses or passes the paper detection sensor 32, in other words, until the leading edge of the paper 36 is detected to be ON by the paper detection sensor 32, the first locking means 64 of the locking means 64 is detected by the control device 100. Since the solenoid 62 is controlled to be turned off, the printing pressure range variable means 28 is in an inoperative state, whereby the press roller 21 is held at a non-printing position, that is, an initial position separated from the outer peripheral surface of the plate cylinder 1. Has been.

  When the plate cylinder 1 rotates at a low speed in the direction of the arrow, first, the sheet feeding start light shielding plate 121 shown in FIG. 11 is engaged with the sheet feeding registration sensor 120, whereby the sheet feeding registration sensor 120 is turned on and fed. A paper start signal is generated, and this signal is used as a trigger to start the paper feed motor 37 (start rotation driving). When the paper feed motor 37 is driven to rotate clockwise in FIG. 12, the paper feed roller shaft 33a and the paper feed roller are fed via the paper feed motor pulley 38, the paper feed motor belt 40, the paper feed roller pulley 39 and the one-way clutch. As the sheet 33 rotates clockwise, the uppermost sheet 36 on the sheet feeding tray 35 that is in contact with the sheet feeding roller 33 is separated into one sheet by the cooperative action with the separating member 34 while being conveyed. The sheet is fed toward the nip portion of the registration roller pair 31 on the downstream side in the conveyance direction X.

  Next, the plate cylinder 1 further rotates in the direction of the arrow in FIG. Then, this signal is used as a trigger to activate the registration motor 41 (start rotation driving). The timing at which the registration motor 41 is activated, in other words, the timing at which the lower registration roller 31b is rotationally driven is the image area of the single-side plate-making image 8YA in the plate-cylinder rotation direction of the plate-making master 8Y wound on the plate cylinder 1. It is set at a predetermined timing when the tip portion reaches a position corresponding to the press roller 21.

  The registration motor 41 is driven to rotate counterclockwise in FIG. 12, and the registration lower shaft 32a and the registration roller lower 31b rotate counterclockwise via the registration motor pulley 42, the registration motor belt 44, and the registration roller pulley 43. Thus, the leading edge of the sheet 36 that is in contact with the nip portion of the registration roller pair 31 and is waiting is fed while being pressed against the registration roller upper 31 a and is sent out between the plate cylinder 1 and the press roller 21. It is.

  Next, the leading edge of the sheet 36 fed by the registration roller pair 31 is normally entered, that is, the leading edge of the sheet 36 is within a predetermined time counted by the timer (or a predetermined amount supplied to the registration motor 41). This signal is input to the control device 100 when the paper detection sensor 32 detects the ON state within the number of pulses. Based on the detection signal of the leading edge of the sheet 36 from the sheet detection sensor 32 and the rotational position information of the plate cylinder 1 from the plate cylinder position detection sensor 29, the control device 100 energizes the first solenoid 62 of the locking means 64. A command signal is transmitted to a solenoid drive circuit (not shown) related to the first solenoid 62, and the first solenoid 62 is turned on, thereby operating the printing pressure range varying means 28.

  When the first solenoid 62 is turned on, the plunger 62a is sucked, whereby the locking member 60 swings counterclockwise around the support shaft 61 against the urging force of the tension spring 63, and the locking member The other end side of the printing pressure arm 22 with which the notch 22b is locked to the locking claw 60a of 60 is released from the other side and is rotated clockwise around the arm shaft 22a by the urging force of the printing pressure spring 25. Swing. The outer peripheral surface of the cam follower 24 abuts on the peripheral surface of the large-diameter portion of the printing pressure cam 27 rotating in synchronization with the plate cylinder 1 by the swinging of the other end portion side of the printing pressure arm 22. Is a rotational position (for example, a rotational position shown by borrowing FIG. 4) of the printing pressure cam 27 that faces the small-diameter peripheral surface of the printing pressure cam 27 and is in a non-contact state, and the printing pressure arm pair 22 is centered on the arm shaft 22a. Then, the urging force of the printing spring 25 swings and rises clockwise.

  Accordingly, as shown in FIG. 10, the press roller 21 has a single-side plate-making image 8YA of the plate-making master 8Y whose outer peripheral surface is wound on the surface region 1A or the back surface region 1B of the plate cylinder 1 shown in FIG. The paper 36 is pressed to the front margin part slightly to the left and displaced to the printing position where the printing pressure is applied, thereby forming the printing nip portion 16a (see, for example, FIG. 4). At the same time, the press roller driving motor 55 rotates the press roller 21 at a substantially same peripheral speed as the peripheral speed of the plate cylinder 1, so that the press roller 21 rotates in the direction opposite to the rotation direction of the plate cylinder 1. By continuously pressing the sheet 36 against the plate-making master 8Y on the plate 1, the plate-making master 8Y is brought into close contact with the outer peripheral surface of the plate cylinder 1 and so-called printing is performed to fill the ink. In this printing, stencil printing is performed by the ink oozing from the opening portion of the opening portion 1a of the plate cylinder 1 to the punching portion of the plate-making master 8Y and transferred to the surface of the paper 36.

  At this time, the ink roller 2 also rotates in the same direction as the rotation direction of the plate cylinder 1. The ink in the ink reservoir 4 is adhered to the surface of the ink roller 2 by the rotation of the ink roller 2, and the amount of the ink is regulated when passing through the gap between the ink roller 2 and the doctor roller 3. To be supplied. On the other hand, in conjunction with the raising / lowering operation of the press roller 21, the refeed conveyance device 104 swings around the drive shaft 107 a via the refeed housing 110. In the single-sided printing mode, the belt driving motor 105 and the suction fan 109 of the refeed conveyance device 104 remain in an inoperative state, the driving motor 94 of the moving unit 87 also remains in an inoperative state, and the moving guide 81 is The initial position P2 is still occupied.

  Thus, plate printing corresponding to the single-side plate-making image 8YA on the plate-making master 8Y on the plate cylinder 1 is performed. The peripheral surface of the large-diameter portion of the printing pressure cam 27 rotating in synchronization with the plate cylinder 1 comes into contact with the outer peripheral surface of the cam follower 24. As a result, the pair of printing arms 22 swings and displaces counterclockwise against the urging force of the printing spring 25 around the arm shaft 22a, and the press roller 21 moves downward to occupy the non-printing position. Thus, the printing pressure application state by the press roller 21 is released.

  When the plate cylinder 1 rotates in the direction of the arrow in FIG. 1 and the clamper 7 reaches the vicinity of the press roller 21 in pressure contact with the plate cylinder 1, the plate cylinder 1 is driven to rotate in synchronization with the rotation of the plate cylinder 1. Since the printing cam 27 is rotated to a position where the circumferential surface of the large-diameter portion is in contact with the outer circumferential surface of the cam follower 24, the press roller 21 is separated from the clamper 7 protruding outward from the outer circumferential surface of the plate cylinder 1. That is, interference between the press roller 21 and the clamper 7 can be avoided.

  The one-side printed paper 36c that has been subjected to plate printing is further conveyed by the rotation of the plate cylinder 1 in the direction of the arrow in FIG. 1 while being pressed by the press roller 21, and the leading end of the single-side printed paper 36c is the plate cylinder 1 The separation claw 170 approaching the outer peripheral surface of the sheet and the blower 171 blow off the plate-making master 8Y on the plate cylinder 1 reliably, and the one-side printed sheet 36c that has been separated falls downward and is discharged and conveyed. The sheet is conveyed to the sheet discharge belt 158 of the apparatus 152 and is attracted and held by the suction force of the suction fan 159 on the upper surface of the sheet discharge belt 158 rotating in the direction of the arrow (counterclockwise) in FIG. The paper is conveyed to the downstream side and discharged to the paper discharge tray 172 with its both ends aligned by a pair of paper discharge side fences 172a and 172b.

  On the other hand, when the press roller 21 comes into contact with the outer peripheral surface of the plate cylinder 1, the plate cylinder 1 makes approximately three quarters of a turn, and when the large diameter peripheral surface of the printing cam 27 and the cam follower 24 come into contact, that is, When the locking claw 60a of the locking member 60 and the notch 22b of the printing pressure arm 22 can be locked, the energization to the first solenoid 62 is cut off (turned off) by a command from the control device 100. Then, the locking member 60 is swung clockwise about the support shaft 61 by the urging force of the tension spring 63, and the notch 22b of the printing pressure arm 22 is locked to the locking claw 60a. As a result, the press roller 21 is returned to and held in the non-printing position away from the outer peripheral surface of the plate cylinder 1, and the plate cylinder 1 is rotated to the home position again and stopped. The stencil printing apparatus 200 enters a print standby state.

  In addition, the platen roller 9 and the conveyance roller pair 13 resume to rotate during paper feeding or plate printing, and the leading end of the cut master 8 is fed toward the nip portion of the conveyance roller pair 13. When it is determined from the number of pulses of the master transport motor 10 that the tip of the cut master 8 has reached the nip portion of the transport roller pair 13 and has been sandwiched, the rotation of the platen roller 9 and the transport roller pair 13 stops, and the next It will be in the plate-making standby state for the plate-making.

  After the double-sided stencil printing apparatus 200 is in a print standby state, the test printing is performed when the test printing key 176 is pressed after inputting printing conditions using the printing speed setting key 183 and various keys on the operation panel 173. When the trial printing key 176 is pressed, the plate cylinder 1 is rotationally driven at the set printing speed and one sheet 36 is fed from the sheet feeding unit 30. The fed paper 36 is temporarily stopped by the registration roller pair 31 and then fed at the same timing as that at the time of printing. The press roller 21 is pressed against the plate-making master 8Y on the outer peripheral surface of the plate cylinder 1. The single-sided printed paper 36c on which the printed image is formed is reliably peeled off from the master-making master 8Y on the plate cylinder 1 by the peeling claw 170 and the peeling fan 171 as described above, and the peeled single-sided printed paper 36c is discharged. The paper is transported by the paper transport device 152 in the same manner as described above and discharged onto the paper discharge tray 172.

  Along with the set printing speed, the control target drive means such as various motors such as the printing pressure range variable means 28, the paper feeding unit 30, and the paper discharge conveying device 152 and various solenoids are driven at speeds and timings suitable for the printing speed. Be controlled. When the position or density of the image is confirmed by trial printing, and the print start key 175 is pressed after the number of prints is input by the numeric keypad 179, the paper 36 is continuously fed from the paper supply unit 30, and the trial printing is performed. The printing operation is performed under the same conditions. When the set number of prints (predetermined number) has been consumed, the plate cylinder 1 stops at the home position, and the double-sided stencil printing apparatus 200 enters the print standby state again. In the normal printing operation, as compared with the printing operation at the time of printing, the number of sheets 36 used for printing as described above is not counted as the normal printing number, and the setting desired by the user The only difference is that the operations of paper feeding, printing, and paper discharge at a speed corresponding to the printing speed are performed.

  When the leading edge of the paper 36 is not detected by the paper detection sensor 32 within a predetermined time counted by the timer of the control device 100, the control device 100 detects that the registration roller pair 31 or the upstream of the paper transport direction X is higher than this. 2, it is determined that the paper 36 is in a staying state due to a jam or the like, and the first solenoid 62 of the locking means 64 is turned off to keep the press roller 21 in the non-printing position as shown in FIG. . As a result, the press roller 21 occupies the printing position in spite of the absence of the paper 36, so that the one-side plate-making image 8YA in the plate-making master 8Y on the plate cylinder 1 comes into contact with the outer periphery of the press roller 21. The surface is prevented from being stained with ink. Such a control operation is the same in a continuous paper feeding operation in the double-sided printing mode, which will be described later, and will not be described below.

  The sheet detection means corresponding to the sheet detection sensor 32 as described above is conveyed so as to detect the leading edge and the trailing edge of the surface printed sheet 36a which is held on the outer peripheral surface of the press roller 21 and conveyed to the printing nip portion 16a. It may be arranged on the road. In addition to the above-described reading operation, the image reading unit 18 may use the ADF 148. The difference from the operation example 1 in this case is as follows. That is, when an A3-size document 133 is set on the document tray 134 of the ADF 148 by the user, the ADF 148 of the image reading unit 18 is operated in parallel with the plate discharging operation, so that one document 133 is read by the reading unit. The only difference is that it is delivered onto a certain contact glass 135. Thereafter, as described above, the image of the original 133 is read as optical information by the operation of the scanner device 132.

(Operation example 2)
Next, an operation example 2 in which the duplex printing mode is set and duplex printing is performed will be described. This operation example 2 includes many operations peculiar to the present invention, and all of the printing pressure range pattern I, the printing pressure range pattern II and the printing pressure range pattern III shown in FIG. 10 are used. For this reason, all the components shown in FIGS. 5 to 7 among the components of the printing pressure range varying means 28 are used. In operation example 2, in order to facilitate understanding of each operation, a master size of A3 is used, and a document size and a paper size of A4 are used. Hereinafter, the points different from the operation example 1 will be mainly described.

  The user stacks A4 size paper 36 as a paper size used for printing on the paper feed tray 35, opens the pressure plate 142, and places the first A4 size original for surface printing on the contact glass 135. After placing, the pressure plate 142 is closed again. Thereafter, after setting the platemaking conditions by using various keys on the operation panel 173, the duplex printing key 187 is pressed to set the duplex printing mode, and then the duplex printing mode is confirmed by turning on the LED 187a. Next, when the plate making start key 174 is pressed, a start signal is generated as in the single-sided printing mode, and this is input to the control device 100.

  Similarly to the first operation example, a paper size detection signal is sent from the paper size detection sensor 117 and a document size detection signal is sent from the document size detection sensor 149 to the control device 100, and the control device 100 receiving these signals receives each signal. Compare signals. In the present embodiment, since the maximum paper size that can be printed by the plate cylinder 1 during single-sided printing is A3 size, the paper size that can be used during double-sided printing is up to A4 landscape.

  As a result of comparing the document size and the paper size, if the two sizes are the same, the image reading operation is immediately performed. If the two sizes are different, the control device 100 displays a warning on the display device 190 as a warning. Call attention to the user. When the paper size and the document size are different, a configuration in which enlargement or reduction is automatically performed in response to a command from the control device 100 to match the document size and the image size, and the display device 190 is configured to reduce or reduce the size of the image data. It is good also as a structure which displays the procedure of rotation etc. and assists a user's operation. If the paper size exceeds A4 landscape orientation, the control device 100 causes the display device 190 to display a message to prohibit double-sided printing operation and prompt single-sided printing.

  When the plate making start key 174 is pressed, a series of operations from discharging to discharging are automatically performed as in the first operation example. Similarly to the first operation example, when the control device 100 determines that the uppermost sheet 36 of the sheet feeding tray 35 is ready to be fed, the sheet feeding unit 30 enters a sheet feeding standby state. After the plate removal operation similar to that in Operation Example 1 is performed, the plate cylinder 1 from which all used masters have been peeled off from the outer peripheral surface is stopped at the plate feed standby position as in Operation Example 1, and is opened and closed (not shown). The clamper 7 is opened by the device.

  In part in parallel with this plate removal operation, the image reading unit 18 performs the reading operation of the first original image for front surface printing in the same manner as in Operation Example 1, and the image data signal passes through the plate making control device and the like. Is transmitted to the thermal head driving circuit. In part in parallel with the plate discharging operation and the image reading operation, the plate making unit 15 performs plate making by the thermal head 11 as in the operation example 1, and the master roll 8a to the master 8 are rotated by the rotation of the platen roller 9 and the conveying roller pair 13. The thermoplastic resin film portion of the master 8 is selectively heated and punched according to image information while being transported in the master transport direction X1 while being pulled out, and the surface plate-making image 8A for surface printing is formed in the first half portion of the master 8. Is formed (see the divided master-making master 8X shown in FIG. 10).

  Then, the leading end of the divided prepress master 8X is inserted between the clampers 7 which are guided by the master guide plate 14 and expanded with respect to the stage 6, and the number of steps of the master transport motor 10 reaches a certain set value. When it is determined that the leading end of the divided plate-making master 8X has reached between the stage 6 and the clamper 7, the clamper 7 is closed by the opening / closing device, and the leading end of the divided plate-making master 8X is moved to the stage 6 and the clamper 7. Adsorbed and pinched between.

  After clamping the front end portion of the divided plate-making master 8X, the plate cylinder 1 resumes rotating at a peripheral speed substantially the same as the master conveying speed by starting the main motor 20 (starting rotation), and the divided plate-making master 8X becomes a platen roller. 9 and the conveying roller pair 13 are fed so as to be wound around the outer peripheral surface of the plate cylinder 1. If the controller 100 determines that the surface plate-making image 8A of the divided plate-making master 8X shown in FIG. 10 has been completed by the number of steps of the master conveyance motor 10, the platen roller 9, the conveyance roller pair 13, and the plate The rotation of the cylinder 1 is stopped, and the plate making standby state for making the back plate making image 8B for back printing in the next divided plate making master 8X is entered.

  Next, the user opens the pressure plate 142 again, places a second A4 size original for back side printing on the contact glass 135, and then closes the pressure plate 142 again. Thereafter, when the plate making start key 174 is pressed again, a start signal is generated and input to the control device 100. At this time, as in the case of the first document, the control device 100 compares the document size with the paper size and performs the same processing operation as described above. In the image reading unit 18, the reading operation of the second original image for back side printing is performed in the same manner as in the case of the first original, and the image data signal passes through the above-described plate making control device (not shown). It is transmitted to the thermal head drive circuit. In the plate making unit 15, plate making is performed by the thermal head 11 as in the case of the first document, and the platen roller 9 and the carry roller pair 13 are rotated by the master carrying motor 10 being rotated again. The thermoplastic resin film portion of the master 8 is selectively heated and punched in accordance with the image information while the master 8 is pulled out from the master roll 8a and is transported in the master transport direction X1, and the back surface is formed on the back surface of the master 8 A back side plate-making image 8B for printing is formed (see FIG. 10).

  At this time, the plate cylinder 1 resumes rotating at the same peripheral speed as the master conveyance speed, so that the latter half of the divided plate-making master 8X is wound around the outer peripheral surface of the plate cylinder 1 while being drawn out from the plate-making part 15. To go. Then, when the controller 100 determines that the last plate making image 8B of the divided plate making master 8X is completed by the number of steps of the master transport motor 10, the cutter 12 is activated and the divided plate making master is completed. The rear end portion of 8X is cut, the rotation of the platen roller 9 and the conveying roller pair 13 is stopped, and the rear end of the divided plate-making master 8X for one plate cut by the rotation of the plate cylinder 1 is the plate making section 15. The drawing / feeding operation of the divided master-making master 8X to the plate cylinder 1 is completed.

  The document image reading operation and the image data input operation are not limited to the above-described example. For example, the document 133 is automatically transported onto the contact glass 135 using the ADF 148, or an image from an external device (not shown). It is good also as a structure which takes in data. Further, in the duplex printing mode, one original may be reversed and conveyed, and two sheets of image data may be acquired from the front and back surfaces. Further, in the double-sided printing mode, one original for front and back printing may be reversed and conveyed, and image data for two sheets may be acquired from the front and back surfaces.

  In this embodiment, when the plate making of the front plate making image 8A in the divided plate making master 8X is completed, the plate making standby state for making the back plate making image 8B for back printing in the next divided plate making master 8X is set. Accordingly, the rotation of the platen roller 9 and the conveying roller pair 13 and the plate cylinder 1 in the plate making unit 15 is temporarily stopped, but it is desirable to do as follows. That is, in addition to the automatic conveyance operation of the original 133 by the ADF 148, an image memory (not shown) including, for example, a bitmap memory or the like that stores a second original in advance and stores and stores image data related to the read original image. If the first and second image data are stored and stored in the image memory and the plate making is performed continuously while sequentially calling the image data, the plate making time can be shortened. And from the viewpoint of shortening the first print time (FPT).

  When the winding of the divided master-making master 8X to the plate cylinder 1 is completed, the plate cylinder 1 starts to rotate in the direction of the arrow shown in FIG. 3 at a predetermined peripheral speed (usually a low speed for printing). Then, a paper feeding / printing process for printing is started. As in the first operation example, until the leading edge of the paper 36 is detected to be on by the paper detection sensor 32, the first solenoid 62 of the locking means 64 is controlled to be off, so that the printing pressure range variable means 28 is controlled. Is in an inoperative state, whereby the press roller 21 is held in the non-printing position.

  When the plate cylinder 1 rotates in the direction of the arrow, first, the sheet feeding start light shielding plate 121 shown in FIG. to start. When the paper feed motor 37 is driven to rotate clockwise in FIG. 12, the uppermost first sheet on the paper feed tray 35 in contact with the paper feed roller 33 is operated through the same operation as in the first operation example. The sheet 36 is separated into one sheet by the cooperative action with the separating member 34 while being conveyed, and is sent toward the nip portion of the registration roller pair 31.

  After the leading edge of the sheet 36 thus fed comes into contact with the nip portion of the registration roller pair 31, the sheet 36 is held in a state where a predetermined curved deflection is formed at the leading end portion of the sheet 36. Next, the plate cylinder 1 further rotates in the direction of the arrow in FIG. 1, and the registration start light shielding plate 122 engages with the paper feed registration sensor 120, whereby the registration motor 41 is started in the same manner as in the first operation example. The registration motor 41 is driven to rotate counterclockwise in FIG. By the rotation of the registration roller pair 31 having the same predetermined timing, it is sent out between the plate cylinder 1 and the press roller 21. At this time, as in the operation example 1, the approach of the leading edge of the paper 36 fed by the registration roller pair 31 is normally detected by the paper detection sensor 32.

  Next, based on the detection signal of the leading edge of the sheet 36 from the sheet detection sensor 32 and the rotational position information of the plate cylinder 1 from the plate cylinder position detection sensor 29, the control device 100 turns on the first solenoid 62 as in the first operation example. As a result, the printing pressure range variable means 28 is operated. When the first solenoid 62 is turned on, the outer peripheral surface of the cam follower 24 comes into contact with the contour peripheral surface of the printing cam 27 through the same detailed operation as in the first operation example, and the outer peripheral surface of the cam follower 24 is in contact with the printing cam 27. At the rotational position of the printing cam 27 that faces the non-contact state of the small diameter portion of the printing pressure arm 27, the printing pressure arm pair 22 swings clockwise around the arm shaft 22a by the urging force of the printing spring 25 and rises. Will be. Hereinafter, when performing printing corresponding to the surface plate-making image 8A in the divided plate-making master 8X on the plate cylinder 1 or surface printing in the regular double-side printing operation described later, the press roller in the printing pressure range pattern I shown in FIG. The printing pressure range variable means 28 is controlled so that the printing pressure ON timing by 21 is selected.

  Thereby, as shown in FIG. 10, the press roller 21 has a slightly outer surface which is wound on the surface region 1A of the plate cylinder 1 shown in FIG. 1 than the surface plate-making image 8A of the divided plate-making master 8X. The paper 36 is pressed against the left end margin and is displaced to the printing position where the printing pressure is applied, so that the printing nip portion 16a is formed (printing by the press roller 21 in the printing pressure range pattern I shown in FIG. 10). Refer to the pressure on timing). At the same time, the press roller drive motor 55 rotates the press roller 21 at a speed substantially equal to the peripheral speed of the plate cylinder 1, so that the press roller 21 rotates in the direction opposite to the rotation direction of the plate cylinder 1. By continuously pressing the sheet 36 against the surface plate-making image 8A portion of the divided plate-making master 8X, the surface plate-making image 8A of the divided plate-making master 8X is brought into close contact with the outer peripheral surface of the plate cylinder 1 and filled with ink. So-called printing is performed. In this plate printing, ink oozes out from the opening portion of the opening portion 1a of the plate cylinder 1 to the perforated portion of the surface plate-making image 8A in the divided plate-making master 8X and is transferred to the surface of the sheet 36, thereby making the stencil plate. Printing is performed.

  At this time, the ink roller 2 also rotates in the same direction as the rotation direction of the plate cylinder 1 as in the first operation example. The ink in the ink reservoir 4 is adhered to the surface of the ink roller 2 by the rotation of the ink roller 2, and the amount of the ink is regulated when passing through the gap between the ink roller 2 and the doctor roller 3. To be supplied. In this way, plate printing corresponding to the surface plate-making image 8A in the divided plate-making master 8X on the plate cylinder 1 is performed, and the plate cylinder 1 is further rotated so that the vicinity of the rear end of the surface plate-making image 8A becomes the printing nip portion 16a. When the corresponding rotational position is reached, the control device 100 turns on the second solenoid 77 based on the rotational position information of the plate cylinder 1 from the plate cylinder position detection sensor 29, so that the plunger 77 a becomes the biasing force of the spring 78. In contrast, when the engagement between the first engagement portion 76a of the stopper 76 and the convex portion 72a of the sleeve 72 is released by being pulled upward in FIG. 7, the spring clutch 73 is connected in FIG. It becomes a state.

  As a result, the clutch body 71, the sleeve 72, the spring clutch 73, and the clutch gear 70 rotate together, and the rotational force of the drive means (main motor 20) meshes with the intermittent cam shaft 68 and the intermittent cam drive gear 66. 65 is transmitted to the intermittent cam 67 and rotated clockwise until the large-diameter portion of the intermittent cam 67 reaches a position substantially right to the right in FIG. 3, and is pressed against the cam follower 24. It rotates counterclockwise around 22a.

  On the other hand, when the second engaging portion 76 b of the stopper 76 and the convex portion 72 a of the sleeve 72 are engaged, the connection of the spring clutch 73 is disconnected again, and the large-diameter portion of the intermittent cam 67 is connected to the printing spring 25. After being rotated to a substantially opposite position in FIG. 3 against the urging force, it is held at that position. As a result, the cam follower 24 is held in a state where it rides on the large-diameter portion of the intermittent cam 67, and the press roller 21 is held in a state where it is separated from the printing position and occupies a substantially non-printing position. At this time, since the first solenoid 62 of the locking means 64 is already turned off by a command from the control device 100, the press roller 21 is returned to and held in the initial position state in which the non-printing position is occupied.

  In parallel with the printing operation, the solenoid 47 is turned on when the clamper 7 of the plate cylinder 1 passes over the press roller 21 occupying the non-printing position, so that the switching guide 46 is shown in FIG. Thus, it is swung counterclockwise around the shaft 47a and occupies the second displacement position and stops. At the same time, when the drive motor 94 of the moving means 87 is activated (for example, forward rotation driving is started), the movement guide 81 is also printed by printing from the initial position (standby position) P2 as shown in FIG. In order to sandwich the leading end position of the printed paper 36a, the four protrusions 81c are guided and moved along the guide groove 88 and move upward and diagonally to the right so as to occupy the movement position P1. When the movement guide 81 occupies the movement position P1 by the number of steps of the drive motor 94 reaching a certain set value, the lower release lever 83 is placed on the contour peripheral surface of the release cam 98 as shown by the solid line in FIG. By sliding on and sliding, the clamp claw 81b swings clockwise and stops in a state where it is released from the contact state with the upper surface of the clamping table 81f.

  When the movement guide 81 occupies the movement position P1 and stops, as shown in FIG. 3, the leading edge of the front surface printed paper 36a occupies the second displacement position and stops at the switching guide 46 and the peeling fan 171. By the operation of (see FIG. 1), it is reliably peeled off from the divided master-making master 8X (see FIG. 10) on the plate cylinder 1. The front end portion of the peeled surface-printed paper 36 a is a plurality of papers (not shown) that are appropriately arranged near the lower part of the paper discharge roller front 156 of the paper discharge conveyance device 152 and between the switching guide 46 and the outer peripheral surface of the press roller 21. By the guide member, the front end of the surface-printed paper 36a is guided by the lower surface of the moving guide 81 and inserted into the gap between the clamping base 81f and the open clamp claw 81b, and then comes into contact with the end fence 81d. The tip is abutted and aligned. When the front end of the surface-printed paper 36a is inserted into the gap between the clamping table 81f and the clamp claw 81b, the drive motor 94 moves the surface-printed paper 36a at a conveying speed (rotation between the plate cylinder 1 and the press roller 21). The movement guide 81 starts to move diagonally downward to the left in the drawing toward the initial position P2 by being activated (for example, reverse rotation start).

  At this time, in FIG. 9, when the lower release lever 83 is disengaged from the contour peripheral surface of the release cam 98, the clamping claw 81b swings counterclockwise by the biasing force of the torsion coil spring, and the free end of the clamp claw 81b The front end of the surface-printed paper 36a is clamped and clamped between the upper surface of the clamping table 81f. As described above, the movement guide 81 moves obliquely downward to the left in the drawing toward the initial position P2 at a movement speed substantially the same as the conveyance speed of the front surface printed paper 36a with the front end of the front surface printed paper 36a fixed.

  Although the description will be mixed, after a predetermined time, in other words, when the large diameter portion of the printing cam 27 rotating in synchronization with the plate cylinder 1 comes into contact with the cam follower 24, the command from the control device 100 When the second solenoid 77 is turned off, the stopper 76 is rotated in the clockwise direction opposite to that shown in FIG. 7 by the urging force of the spring 78, so that the convexity of the second engaging portion 76 b of the stopper 76 and the sleeve 72. When the engagement with the portion 72a is released, the spring clutch 73 is reconnected. Thus, as described above, the clutch body 71 and the clutch gear 70 rotate integrally, and the rotational force of the drive means is intermittent cam via the intermittent cam shaft 68 and the intermittent cam drive gear 66. 67, the large-diameter portion of the intermittent cam 67 is rotated in the vicinity of the position shown in FIG. 3, and then the stopper 76 is rotated by a predetermined angle, so that the first engaging portion 76a of the stopper 76 becomes the sleeve as shown in FIG. By engaging the convex portion 72a of 72, the connection of the spring clutch 73 is disconnected again, and the large-diameter portion of the intermittent cam 67 is rotated to the initial position shown in FIG. . At this time, since the first solenoid 62 is controlled to be off, the press roller 21 is held in the non-printing position. Then, it enters a paper feed standby state for the next paper feed.

  On the other hand, as shown in FIG. 4, the surface-printed paper 36 a is directed toward the initial position P <b> 2 while being clamped and fixed between the clamp claw 81 b of the movement guide 81 and the clamping table 81 f by the operation of the moving means 87. When the movement guide 81 occupies the initial position P2 and stops, the upper side of the release lever 82 comes into contact with the release pin 99 as shown by a two-dot chain line in FIG. By swinging around, the front end portion including the front end of the front surface printed paper 36a is released from the sandwiched / fixed state. The solenoid 47 is turned off when the rear end of the front surface printed paper 36a passes the switching guide 46, so that the switching guide 46 is centered on the shaft 47a as shown by the solid line in FIG. It is controlled so as to swing clockwise and return to the first displacement position (initial position) and stop.

  The front-side printed paper 36a with the leading end opened is first sucked by the suction fan 109 of the refeed conveyance device 104, and the non-printed image surface on the back surface is sucked onto the upper surface of the conveyance belt 108 and temporarily adsorbed. The front end of the surface-printed paper 36a is held and fixed, and then is rotated and conveyed by the conveying belt 108 via the clockwise rotation of the conveying roller 107 after the conveying roller 107 is driven and driven for a predetermined time. Is conveyed between the press roller 21 and the refeed roller 51. As a result, the front end of the surface-printed paper 36a is conveyed to a position close to the nip portion to be formed between the press roller 21 and the refeed roller 51, that is, a predetermined position detected by the refeed sensor 52. Thereafter, the belt drive motor 105 is temporarily stopped to stop the rotation of the conveyor belt 108.

  Next, based on the rotational position information of the plate cylinder 1 from the plate cylinder position detection sensor 29, the surface of the plate cylinder 1 corresponds to a predetermined position, that is, the reverse side plate-making image 8B in the divided plate-making master 8X on the plate cylinder 1. When the control device 100 determines that the rotational position of the plate cylinder 1 has been reached at which printing on the back surface of the finished paper 36a is possible, the belt drive motor 105 is moved to a predetermined position in accordance with the rotation of the plate cylinder 1 to the predetermined position. By being started again at the timing, the conveyance roller 108 starts rotating clockwise again, so that the circumferential speed of the plate cylinder 1 is approximately the same as the conveyance belt 108 holding the back surface of the surface-printed paper 36a. It is rotated clockwise at the same linear velocity. At the same time, the press roller drive motor 55 shown in FIG. 2 is driven to rotate, so that the press roller 21 is rotated counterclockwise. The front end of the surface-printed paper 36a that is close to the nip portion and temporarily held / waiting on the upper surface of the re-feed sensor 52 is rotated counterclockwise by the press roller 21 that rotates counterclockwise. While being sandwiched between the re-feed roller 51 and the re-feeding roller 51, it is guided so as to be conveyed along the outer peripheral surface of the press roller 21 by the roller guide plate 50 at a substantially same peripheral speed as the peripheral speed of the plate cylinder 1. Then, the plate cylinder 1 and the press roller 21 are conveyed while being turned upside down toward the printing nip portion 16a formed by pressure contact.

  In parallel with this conveyance, when a predetermined rotational position of the plate cylinder 1, that is, a portion in the vicinity of the front end of the back plate-making image 8B on the divided plate-making master 8X on the plate cylinder 1 reaches a rotational position corresponding to the printing nip portion 16a. In this case, when the small diameter portion of the printing cam 27 rotating in synchronization with the plate cylinder 1 is in a non-contact state facing the cam follower 24, the controller 100 detects the plate cylinder 1 from the plate cylinder position detection sensor 29. The second solenoid 77 is turned off based on the rotational position information. As a result, the large-diameter portion of the intermittent cam 67 is rotated to the initial position indicated by the solid line in FIG. 4 and then held at that position through the same detailed operation as described above. At this time, as shown in FIG. 4, since the small diameter portion of the printing pressure cam 27 and the small diameter portion of the intermittent cam 67 are in the non-contact state facing the cam follower 24, as shown in FIG. The back surface of the surface-printed paper 36a (see FIG. 4) at the front end portion slightly left of the rear plate-making image 8B of the divided plate-making master 8X wound on the back surface region 1B of the plate cylinder 1 shown in FIG. The printing nip portion 16a is formed by the urging force of the printing pressure spring 25, and printing on both sides is performed. (Refer to the printing pressure ON timing by the press roller 21 in the printing pressure range pattern II shown in FIG. 10).

  In this way, the double-side printed paper for printing on which the double-sided printing is performed in which the back side printed image is formed on the back side of the front side printed paper 36a corresponding to the back side plate-making image 8B in the divided plate-making master 8X on the plate cylinder 1. Similarly to the paper discharge operation for the single-side printed paper 36c, 36b is a divided plate-making master 8X on the plate cylinder 1 by air blown from the peeling claw 170 and the peeling fan 171 whose leading end approaches the outer peripheral surface of the plate cylinder 1. The double-sided printed paper 36b that has been reliably peeled off from the paper falls downward and is sent to the paper discharge conveying device 152, and is rotated counterclockwise as shown in FIG. The sheet is conveyed to the downstream side in the sheet conveyance direction X while being attracted and held by the suction force of the suction fan 159 and discharged to the sheet discharge tray 172.

  On the other hand, when the press cylinder 21 makes approximately three-quarters of a turn from the point when the press roller 21 contacts the outer peripheral surface of the plate cylinder 1 and the cam follower 24 is in contact with the peripheral surface of the large diameter portion of the printing cam 27, the operation is performed. Through the same detailed operation as in Example 1, the press roller 21 is returned and held in the non-printing position away from the outer peripheral surface of the plate cylinder 1, and the plate cylinder 1 is rotated to the home position again and stopped. After completing the printing operation, the double-sided stencil printing apparatus 200 enters a printing standby state for the next regular double-sided printing.

  After the duplex stencil printing apparatus 200 enters the print standby state, the printing conditions are input using the printing speed setting key 183 and the various keys on the operation panel 173, and then the position or density of the image is confirmed by trial printing as appropriate. When the print start key 175 is pressed after the number of prints is input by 179, the paper 36 is continuously fed from the paper supply unit 30 and the double-sided printing operation of the set number set by the ten key 179 is performed.

  That is, the set number of double-sided printing operations are performed by re-feeding the first first surface-printed paper 36a (hereinafter, simply referred to as “first surface-printed paper 36a”), as in the above-described printing process. Since it is the same until it is sucked and held by the conveyance belt 108 of the paper conveyance device 104 and then conveyed to a predetermined position where the leading edge is detected by the re-feed sensor 52, the description is omitted. . In parallel with the operation until the first surface-printed paper 36a is transported by the transport belt 108 to a predetermined position where the leading edge of the paper 36a is detected by the refeed sensor 52 and reaches the standby state, the second paper 36 Is fed out from the registration roller pair 31 between the plate cylinder 1 and the press roller 21 at a predetermined timing through the same detailed operation as described above.

  As shown in FIG. 3, the movement guide 81 occupies the movement position P <b> 1 so as to sandwich the leading edge position of the next second front surface printed sheet 36 a from the initial position P <b> 2 through the same detailed operation as described above. When the release lever lower 83 rides on the release cam 98 as shown by the solid line in FIG. 9, the clamp pawl 81b swings clockwise and contacts the upper surface of the clamping base 81f. Stop and wait in the released state. On the other hand, in parallel with the movement operation of the movement guide 81 to the movement position P1, the solenoid 47 is turned on when the clamper 7 of the plate cylinder 1 passes over the press roller 21 occupying the non-printing position. The switching guide 46 is swung counterclockwise as shown in FIG. 3 to occupy the second displacement position and stop.

  When the movement guide 81 occupies the movement position P1 and stops in the open state, the next second front surface printed sheet 36a occupies the second displacement position and stops at the switching guide 46 and the peeling fan 171 ( 1), the front end portion of the surface-printed paper 36a that has been peeled off from the divided master-making master 8X (see FIG. 10) on the plate cylinder 1 is surely removed. It is guided to the lower surface of the movement guide 81 by the paper guide member, inserted into the gap portion between the clamping table 81f and the opened clamp claw 81b, and then comes into contact with the end fence 81d so that the leading end is abutted and aligned. When the front end of the surface-printed paper 36a is inserted into the gap between the clamping table 81f and the clamp claw 81b, the movement guide 81 is moved to the second sheet through the detailed operation of the movement unit 87 similar to that described above. The movement starts toward the initial position P2 at substantially the same speed as the conveyance speed of the front surface printed paper 36a.

  At this time, in FIG. 9, when the lower release lever 83 is disengaged from the contour peripheral surface of the release cam 98, the clamping claw 81 b swings counterclockwise by the biasing force of the torsion coil spring, and the free end of the clamping claw 81 b The leading edge of the second printed sheet 36a is clamped and clamped between the upper surface of the clamping table 81f. The movement guide 81 moves obliquely downward to the left in the drawing toward the initial position P2 at a movement speed substantially the same as the conveyance speed of the front surface printed paper 36a with the front end of the second front surface printed paper 36a fixed.

  4 and 10, when printing is performed on the second sheet corresponding to the surface plate-making image 8A in the divided plate-making master 8X on the plate cylinder 1, and subsequently, it is reversed and conveyed by the re-feeding means 45. When printing on the back side of the first front-side printed sheet 36a corresponding to the back side plate-making image 8B in the divided plate-making master 8X on the plate cylinder 1, the normal single-sided printing mode (see operation example 1) is used. Similarly, the printing pressure range variable means 28 is controlled so that the printing pressure ON timing by the press roller 21 in the printing pressure range pattern III shown in FIG. 10 is selected. Since the detailed operation of the printing pressure range varying means 28 at this time is performed in the same manner as in the operation example 1, the description thereof is omitted.

  Although description will be made before and after, based on the rotational position information of the plate cylinder 1 from the plate cylinder position detection sensor 29, the outer periphery of the press roller 21 and the plate cylinder 1 that is rotationally driven in a pressed state are in a predetermined position, that is, the plate cylinder. The control device 100 determines that the rotational position of the plate cylinder 1 has reached the position where printing on the back surface of the first front-side printed paper 36a is possible corresponding to the back-side plate-making image 8B in the divided plate-making master 8X on 1. Then, when the belt driving motor 105 is started again, the post-conveying roller 107 starts rotating clockwise again, so that the conveying belt 108 sucks and holds the back surface of the first front surface printed paper 36a. In this state, it is rotated clockwise at substantially the same linear velocity as the peripheral velocity of the plate cylinder 1. At this time, as shown in FIG. 4, the press roller drive motor 55 is driven to rotate, and the press roller 21 is rotated counterclockwise, so that the nip between the press roller 21 and the refeed roller 51 is reduced. The front end of the surface-printed paper 36a that is held in contact with the paper is sandwiched between the press roller 21 that rotates counterclockwise and the refeed roller 51 that rotates clockwise following this. The plate cylinder 1 and the press roller 21 are already pressed against each other by being guided by the roller guide plate 50 so as to be conveyed along the outer peripheral surface of the press roller 21 at a speed substantially equal to the peripheral speed of the plate cylinder 1. In this way, the sheet is conveyed while being turned upside down toward the printing nip portion 16a formed.

  The detailed operation of the printing pressure range changing means 28 at this time is performed in the same manner as in the operation example 1 as described above. As shown in FIG. 4, the surface plate-making image in the divided plate-making master 8X on the plate cylinder 1 is obtained. The second sheet of paper is pressed against the 8A by the press roller 21, and the back plate making image in the divided plate-making master 8X on the plate cylinder 1 with the press roller 21 continuously occupying the printing position. The back surface of the first front surface printed paper 36 a that has been reversely conveyed by the paper refeeding unit 45 to 8B is pressed by the press roller 21.

  On the other hand, as shown in FIG. 4, the second surface-printed paper 36a is held and fixed between the clamp claw 81b of the moving guide 81 and the holding table 81f, and the detailed operation of the moving means 87 described above. When the movement guide 81 occupies the initial position P2 and stops, the release lever upper 82 comes into contact with the release pin 99 as shown by a two-dot chain line in FIG. When the clamp pawl 81b is swung clockwise, the tip of the second front surface printed paper 36a is released. When the rear end of the second front surface printed paper 36a passes the switching guide 46, the solenoid 47 is turned off and the switching guide 46 is swung clockwise as indicated by the solid line in FIG. It is moved to return to the first displacement position (initial position) and stops.

  The second surface-printed paper 36 a having its front end opened is first suctioned by the suction fan 109 of the refeed conveyance device 104, so that the non-printed image surface on the rear surface is sucked onto the upper surface of the conveyance belt 108. The leading edge of the second surface-printed paper 36a is brought into contact with the press roller 21 by the rotational conveyance of the conveyance belt 108 by temporarily holding and fixing the suction and then driving the belt drive motor 105 for a predetermined time. It is conveyed toward the re-feed roller 51. As a result, the front end of the surface-printed paper 36a is conveyed to a position close to the nip portion to be formed between the press roller 21 and the refeed roller 51, that is, a predetermined position detected by the refeed sensor 52. Thereafter, the belt drive motor 105 is temporarily stopped to stop the rotation of the conveyor belt 108.

  In parallel with the transport operation of the second front-side printed paper 36a described above, as shown in FIG. 4, the first front side corresponding to the back side plate-making image 8B in the divided plate-making master 8X on the plate cylinder 1 The first double-sided printed paper 36b having the back side printed image formed on the back side of the printed paper 36a has a leading end portion similar to the first example and the paper discharge operation at the time of printing in the double-sided printing mode. The double-sided printed paper 36b that has been peeled off from the divided plate-making master 8X on the plate cylinder 1 is surely peeled off by the air from the peeling claw 170 and the peeling fan 171 approaching the outer peripheral surface of the plate cylinder 1, and falls downward. Then, the sheet is conveyed to the sheet conveying device 152 and conveyed to the downstream side in the sheet conveying direction X while being attracted and held by the suction force of the suction fan 159 on the upper surface of the sheet discharging belt 158 rotating counterclockwise. It is, is discharged to the discharge tray 172.

  In parallel with the first double-sided printing operation, the second front-side printed paper 36a that has been stopped / waiting on the conveyor belt 108, which is a predetermined position whose leading edge is detected by the re-feed sensor 52, Based on the rotational position information of the plate cylinder 1 from the plate cylinder position detection sensor 29, the plate cylinder 1 corresponds to the predetermined position, that is, the second plate-making image 8B in the divided plate-making master 8X on the plate cylinder 1. When the control apparatus 100 determines that the rotation position of the plate cylinder 1 that enables printing on the back surface of the front-side printed paper 36a has been reached, the post-conveying roller 107 is adjusted in accordance with the rotation of the plate cylinder 1 to a predetermined position. By starting to rotate clockwise again at a predetermined timing, the conveyor belt 108 sucks and holds the back surface of the second front surface printed paper 36a, and rotates clockwise at substantially the same linear speed as the peripheral speed of the plate cylinder 1. To be rotated. At the same time, the press roller 21 is rotated counterclockwise, so that the leading edge of the second surface-printed paper 36a is rotated counterclockwise with the press roller 21 rotating counterclockwise. While being sandwiched between the re-feed roller 51 and the rotating re-feeding roller 51, it is guided so as to be conveyed along the outer peripheral surface of the press roller 21 by the roller guide plate 50 at a substantially same peripheral speed as the peripheral speed of the plate cylinder 1. Then, the sheet is conveyed toward the printing nip portion 16a while being turned upside down.

  Similarly to the first double-sided printing described above, the second front-side printed paper 36a has a back side printed image formed on the back side thereof corresponding to the back side plate-making image 8B in the divided plate-making master 8X on the plate cylinder 1. Thereafter, the leading end portion of the plate cylinder 1 is surely peeled off from the divided plate-making master 8X on the plate cylinder 1 by the air blow from the peeling claw 170 and the peeling fan 171 approaching the outer peripheral surface of the plate cylinder 1. The peeled second double-side printed paper 36b is dropped downward and sent to the paper discharge conveying device 152, and is sucked onto the upper surface of the paper discharge belt 158 rotating counterclockwise by the suction force of the suction fan 159. While being attracted and held by suction, it is transported to the downstream side in the paper transport direction X and is discharged to the paper discharge tray 172.

  Thereafter, for the set number N of sheets set with the numeric keypad 179, the same printing operation as described above is repeated until the (N-1) th sheet. When performing duplex printing on the back surface of the Nth (last 1st) front printed sheet 36a temporarily held in the refeed conveyance device 104 immediately before the end of the printing operation, the mark shown in FIG. The printing pressure range variable means 28 is controlled so that the printing pressure ON timing by the press roller 21 in the pressure range pattern II is selected. That is, the back surface of the N-th surface printed paper 36a is pressed only by the press roller 21 only on the back side plate-making image 8B in the divided plate-making master 8X on the plate cylinder 1, and hereinafter, the same paper discharge operation as described above is performed. After that, the double-sided printing operation of the set number N is completed, and the double-sided stencil printing apparatus 200 enters a print standby state.

  Compared with the double-sided printing operation at the time of printing, the normal regular double-sided printing operation does not count the number of sheets 36 used for printing as described above as the normal normal printing number, and the user However, the only difference is that operations such as paper feeding, refeeding, front side printing, back side printing, and paper discharge are performed at a speed corresponding to a desired set printing speed. As described above, in the normal regular double-sided printing operation, the set number of double-sided printings is performed every rotation of the plate cylinder 1, and the surface plate-making image of the divided plate-making master 8 </ b> X is obtained in approximately half rotation of the plate cylinder 1. The front surface printing corresponding to 8A is performed in this order in the remaining half rotation of the plate cylinder 1 in this order, corresponding to the rear surface plate-making image 8B of the divided plate-making master 8X.

(Operation example 3)
Next, an operation example 3 in which the refeed cleaning operation is performed by setting the refeed cleaning mode will be described. For example, referring to FIG. 4, the second sheet of the surface-printed paper 36a is detected by the refeed sensor 52 to detect that the other end is positioned at a predetermined position. When the paper 36a having the surface printed on the eyes does not reach between the plate cylinder 1 and the press roller 21 and a jam or the like occurs, the press roller 21 does not have a sheet, but the divided plate making on the plate cylinder 1 is performed. Since the pressed master 8X (see FIG. 10) is pressed, the outer peripheral surface of the press roller 21 and the divided master-printed master 8X on the plate cylinder 1 are stained with ink. In order to carry out such cleaning of ink stains (cleaning), the same cylinder is used while the plate cylinder 1 is wound with the master plate 8X that has been subjected to divided plate making. A specific example of the refeed cleaning mode in which the refeeding operation and the operation of repeatedly pressing the press roller 21 against the plate cylinder 1 will be described.

  The operation example 3 includes many operations peculiar to the present invention, and at least one of the printing pressure range pattern I and the printing pressure range pattern II shown in FIG. 10 is used. Also in the operation example 3, in order to facilitate understanding of each operation, the master size is A3, and the document size and the paper size are A4 size. Hereinafter, the difference from the operation example 2 will be mainly described.

  When a jam or the like occurs during the above-described double-sided printing operation with the divided master-making master 8X shown in FIG. 10 wound around the plate cylinder 1, or after completion of a predetermined number (multiple) of double-sided printing operations. When the user depresses the cleaning key 186, a refeed cleaning mode setting signal is generated and input to the control device 100, so that the built-in LED is lit and the refeed cleaning mode is set. Visible. Next, when a plate-making start key 174 is pressed, a start signal is generated. When this signal is input to the control device 100, a re-feed cleaning operation (process) is automatically executed under a command from the control device 100. . The start signal from the plate making start key 174 in this case is not a start signal for automatically executing the plate making operation following the plate discharging operation, but for starting and starting the same mode.

  The re-feed cleaning operation is performed while the divided master-making master 8X shown in FIG. 10 is wound around the plate cylinder 1, that is, without performing the plate removal or the plate-making process. Similarly to the plate-making process described above, one surface-printed sheet 36a that has been surface-printed in correspondence with the surface plate-making image 8A of the divided plate-making master 8X on the plate cylinder 1 at the printing nip portion 16a is re-supplied. Since it is the same until it is sucked and held by the conveyance belt 108 of the paper conveyance device 104 and then conveyed to a predetermined position where the leading edge is detected by the re-feed sensor 52, the description is omitted. Further, the printing pressure ON timing and the pressing range by the press roller 21 are also controlled in the same manner as described above so that the printing pressure range pattern I shown in FIG. 10 is selected in this example.

  In parallel with the movement operation of the movement guide 81 to the movement position P1, when the clamper 7 of the plate cylinder 1 passes over the press roller 21 occupying the non-printing position, the switching guide 46 is shown by borrowing FIG. As such, it occupies the second displacement position and stops. In this state, the same surface-printed paper 36a (hereinafter referred to as “the same surface-printed paper 36a”) as described above is pressed against the plate cylinder 1 around which the divided master-making master 8X is wound. 21 until the pressing is completed a predetermined number of times.

  The same front surface printed paper 36 a that has been stopped / standby on the conveying belt 108 at a predetermined position whose leading edge is detected by the refeed sensor 52 is the rotational position information of the plate cylinder 1 from the plate cylinder position detection sensor 29. Based on the above, the plate cylinder 1 is capable of printing on the back surface of the same surface-printed paper 36a corresponding to the surface plate-making image 8A on the master plate 8X on the plate cylinder 1 at the predetermined position, that is, on the plate cylinder 1. When the control device 100 determines that the rotation position has been reached, the conveyance roller 108 starts rotating at a predetermined timing in the clockwise direction again, so that the conveyance belt 108 moves the reverse side of the same front printed sheet 36a. While being sucked and held, the plate cylinder 1 is rotated clockwise at substantially the same linear velocity as the circumferential velocity of the plate cylinder 1. At the same time, the press roller 21 is rotated counterclockwise, so that the front end of the same front surface printed paper 36a has a press roller 21 that rotates counterclockwise and a refeed roller 51 that rotates clockwise. The printing nip portion 16a is guided by the roller guide plate 50 so as to be conveyed along the outer peripheral surface of the press roller 21 at a substantially same peripheral speed as the peripheral speed of the plate cylinder 1. It is conveyed while being turned upside down.

  In parallel with the operation of transporting the same front surface printed paper 36a to the printing nip portion 16a, the movement guide 81 is configured to hold the front end position of the same front surface printed paper 36a from the initial position (standby position) P2. The protrusion 81c at the location is moved to the upper right as shown in FIG. 3 while being guided and moved along the guide groove 88. When the movement guide 81 occupies the movement position P1 by the number of steps of the drive motor 94 reaching a certain set value, the lower release lever 83 is placed on the contour peripheral surface of the release cam 98 as shown by the solid line in FIG. By sliding on and sliding, the clamp claw 81b swings clockwise and stops in a state where it is released from the contact state with the upper surface of the clamping table 81f.

  When the movement guide 81 occupies the movement position P1 and stops, the press roller 21 has a surface of the divided prepress master 8X whose outer peripheral surface is wound on the surface region 1A of the plate cylinder 1 shown in FIG. The back surface (upper surface) of the same front surface printed paper 36a is pressed against the tip portion slightly left of the plate-making image 8A (see the printing pressure on timing by the press roller 21 in the printing pressure range pattern I shown in FIG. 10). A surface printing image corresponding to the surface plate-making image 8A of the divided plate-making master 8X is formed and printed on the back surface (upper surface) of the same surface-printed paper 36a, and the periphery of the surface plate-making image 8A of the divided plate-making master 8X. The ink adhering to is absorbed by the back surface (non-printed image surface which is also the top surface in the drawing) of the same front surface printed paper 36a. At the same time, the ink adhering to the outer peripheral surface of the press roller 21 is also absorbed by the surface (surface printed image surface which is also the lower surface in the drawing) of the same surface printed paper 36a.

  In this way, the front end of the same surface-printed paper 36a on which the surface-printed image is formed and the ink is absorbed occupies the second displacement position and the switching guide 46 and the peeling fan 171 (see FIG. 1) are stopped. By the operation, it is surely peeled off from the divided master-making master 8X (see FIG. 10) on the plate cylinder 1. The front end portion of the peeled same surface-printed paper 36a is guided to the lower surface of the movement guide 81 by a plurality of paper guide members (not shown) and is inserted into a gap portion between the clamping base 81f and the open clamp claw 81b. Then, by abutting against the end fence 81d, the tips thereof are abutted and aligned. When the front end of the surface-printed paper 36a is inserted into the gap between the clamping table 81f and the clamp claw 81b, the drive motor 94 moves the surface-printed paper 36a at a conveying speed (rotation between the plate cylinder 1 and the press roller 21). The movement guide 81 starts to move diagonally downward to the left in the drawing toward the initial position P2 by being activated (for example, reverse rotation start).

  At this time, in FIG. 9, when the lower release lever 83 is disengaged from the contour peripheral surface of the release cam 98, the clamping claw 81b swings counterclockwise by the biasing force of the torsion coil spring, and the free end of the clamping claw 81b The front end of the surface-printed paper 36a is held between the upper surface of the holding table 81f. The moving guide 81 is directed toward the initial position P2 through the above detailed operation of the moving means 87 at a moving speed substantially the same as the conveying speed of the same front surface printed paper 36a with the front end of the same front surface printed paper 36a fixed. In the figure, it moves diagonally to the left.

  When the movement guide 81 occupies the initial position P2 and stops, the release lever upper 82 comes into contact with the release pin 99 as described with reference to the two-dot chain line in FIG. As a result, the leading end of the same front surface printed paper 36a is opened. Next, first, the suction fan 109 of the refeed conveyance device 104 is driven, whereby the non-printing image surface on the back side is sucked onto the upper surface of the conveyance belt 108 and temporarily sucked and held and fixed, and then the belt drive motor 105 is When activated, the leading end of the same surface printed paper 36 a is transported to a predetermined position close to the nip portion between the press roller 21 and the refeed roller 51 by the rotational transport of the transport belt 108. As a result, after the leading edge of the same front surface printed paper 36a is transported to a predetermined position, that is, to a predetermined position detected by the refeed sensor 52, the belt driving motor 105 is temporarily stopped to drive the transport belt. The rotation of 108 is temporarily stopped to enter a standby state for the next transport process.

  Nipping the tip of the same front surface printed paper 36a at the movement position P1 by the movement guide 81, moving to the initial position P2, opening the front end of the same front surface printed paper 36a at the initial position P2, and re-feeding After a series of steps of refeeding by the paper means 45 and pressing the press roller 21 against the plate cylinder 1 in the printing unit 16 is repeated a predetermined number of times, the front surface printed image is printed on the front and back surfaces a plurality of times (predetermined number of times) and cleaned. Therefore, the same front surface printed paper 36a that has absorbed the ink for the front and back surfaces is discharged. That is, in the final round of the predetermined number of times, when the rear end of the same front surface printed paper 36a passes the switching guide 46, the switching guide 46 rotates clockwise as shown by a solid line in FIG. To return to the first displacement position (initial position) and stop. The same surface-printed paper 36a having the surface printed image printed on the front and back surfaces a predetermined number of times and absorbing the cleaning ink on the front and back surfaces is hereinafter referred to as the paper discharge operation at the time of printing in the duplex printing mode. The same double-sided printed paper 36b that has been peeled off from the divided master-making master 8X on the plate cylinder 1 by the air blow from the peeling claw 170 and the peeling fan 171 whose leading end approaches the outer peripheral surface of the plate cylinder 1 and peeled off. Falls downward and is sent to the paper discharge conveyance device 152 and is attracted to and sucked by the suction force of the suction fan 159 on the upper surface of the paper discharge belt 158 rotating counterclockwise and downstream in the paper conveyance direction X. Are discharged to the discharge tray 172.

  In the third operation example, the printing pressure range variable means 28 is controlled so that the printing pressure ON timing by the press roller 21 in the printing pressure range pattern I shown in FIG. The back surface and the front surface of the same front surface printed paper 36a are alternately and repeatedly pressed only on the front surface image 8A of the divided prefabricated master 8X wound on the upper surface. However, the present invention is not limited to this. , Only on the back plate making image 8B of the divided plate making master 8X wound on the back surface region 1B of the plate cylinder 1, or alternately on the same front plate making image 8A and the same back plate making image 8B. A configuration may be employed in which the printing pressure range varying unit 28 and the like are controlled so as to press the double-side printed paper 36b.

By repeatedly pressing in this way, the amount of ink transferred to the front and back surfaces of the same front-side printed paper 36a increases, so that after the repeated pressing is completed a plurality of times, the next paper 36 is further removed from the paper feeding unit 30. It may be configured such that a new paper is fed and the same paper 36 (the same front-printed paper 36a is printed once the front-surface printed image is printed) and repeatedly pressed a plurality of times. A sorter (automatic paper distribution device, automatic paper sorting device) that is detachably connected to or attached to the paper discharge unit as appropriate, or a structure in which paper discharge can be switched to a plurality of paper discharge trays (paper output trays). The same printed paper 36 (the same front surface printed paper 36a or the same double side printed paper 36b) that has been repeatedly pressed is distinguished from the regular printed paper by discharging it separately to the sorter or the like. Desirable from above.
Further, in the operation example 3, the predetermined number of times is stored and stored in the ROM 102 in advance, and under the instruction from the control device 100, the data related to the predetermined number of times is called from the ROM 102 and the refeed cleaning mode is executed. However, the present invention is not limited to this. For example, a so-called serviceman program using a combination of keys such as the numeric keypad 179 can be configured so that an arbitrary set number of times can be set instead of the predetermined number of times, or a PROM can be used. The predetermined number of times may be configured to be rewritable.

(Operation example 4)
Next, an operation example 4 in which the plateless refeed cleaning mode is set and the plateless refeed cleaning operation is performed will be described. For example, as in the case of the operation example 3, when the front-side printed paper 36a does not reach between the plate cylinder 1 and the press roller 21 due to some cause or trouble, the press roller 21 has no paper. In spite of this, since it presses against the master 8X (see FIG. 10) on the plate cylinder 1, the outer peripheral surface of the press roller 21, the master 8X on the plate cylinder 1 and so on are stained with ink. End up. In order to execute such cleaning of ink stains (cleaning), the same cylinder is used in a state where the plate cylinder 1 is wound with an unmade master 8X, and the same is continuously discharged without being discharged to the discharge unit 19. A specific example of the plateless re-feed cleaning mode in which the operation of repeating the re-feeding operation and repeatedly pressing the press roller 21 against the plate cylinder 1 will be described.

  The operation example 4 includes many operations peculiar to the present invention similarly to the operation example 3, and at least one of the printing pressure range pattern I and the printing pressure range pattern II shown in FIG. 10 is used. . Also in the operation example 4, in order to facilitate understanding of each operation, the master size is A3, and the document size and the paper size are A4 size. In the operation example 4, the plate cylinder 1 winds the master 8 that has not been subjected to plate making, compared with the operation example 3 in which the refeed cleaning mode is executed in a state where the plate cylinder 1 winds the divided plate-making master 8X. The main difference is that the plateless refeed cleaning mode is executed in this state. Hereinafter, the difference from the operation example 3 will be mainly described.

  When a jam or the like occurs during the above-described double-sided printing operation with the divided master-making master 8X shown in FIG. 10 wound around the plate cylinder 1, or after completion of a predetermined number (multiple) of double-sided printing operations. When the user presses the plate-less cleaning key 186A, a plate-less re-feed cleaning mode setting signal is generated and input to the control device 100, so that the built-in LED is turned on and the plate-less re-feed is re-feeded. It is visually confirmed that the cleaning mode is set. Next, when the plate making start key 174 is pressed, a start signal is generated, and when this is input to the control device 100, the plate making re-feed cleaning operation (process) is automatically executed under the command from the control device 100. Is done. The start signal from the plate making start key 174 in this case is an activation signal for executing the plate making re-feed cleaning mode including the automatic execution of the plate making operation subsequent to the plate discharging operation. Is for starting up and starting up.

  First, a paper size detection signal is sent from the paper size detection sensor 117 to the control device 100, and the control device 100 recognizes that the signal is of A4 size. At this time, if the paper size is not A4 size, the control device 100 displays that fact on the display device 190 to alert the user. In parallel with this, a series of operations ranging from plate removal to plateless plate feeding is automatically performed. Prior to this, the paper feed tray raising / lowering motor is turned on to raise the paper feed tray 35 and the uppermost paper 36 abuts the paper feed roller 33 to turn on a paper feed position detection sensor (not shown). When the control device 100 determines that the uppermost paper 36 is ready to be fed by detection, the paper feeding device 30 enters a paper feed standby state.

  In parallel with the above operation, the plate discharging unit 17 performs a detailed operation similar to that of the operation example 1 and performs a plate discharging operation for peeling the used master (for example, the divided plate-making master 8X) from the outer peripheral surface of the plate cylinder 1. Even after all the used masters are peeled off from the outer peripheral surface, the plate cylinder 1 continues to rotate, and stops until the clamper 7 rotates to a predetermined plate feed standby position located substantially directly above. When the plate cylinder 1 stops at the plate feeding standby position, an opening / closing device (not shown) is operated to open the clamper 7, and the double-sided stencil printing apparatus 200 enters a plate feeding standby state.

  In parallel with the above plate discharging operation, the plate making operation without plate making is performed without performing the reading operation of the document image by the image reading unit 18. That is, when the master transport motor 10 is driven to rotate, the platen roller 9 and the transport roller pair 13 start to rotate, and the master guide is being transported in the master transport direction X1 while being pulled out from the master roll 8a. It is inserted between the clampers 7 that are guided by the plate 14 and are expanded with respect to the stage 6, and the number of steps of the master transport motor 10 reaches a certain set value. If it is determined that it has reached between the clamper 7, the clamper 7 is closed by the opening and closing device, and the leading end of the master 8 that has not been made is attracted and clamped between the stage 6 and the clamper 7.

  After clamping the leading end of the unmade master 8, the plate cylinder 1 resumes rotating at a peripheral speed substantially the same as the master transport speed by the rotation of the main motor 20, and the unmade master 8 becomes the platen roller 9 and the transport roller. The plate 13 is conveyed so as to be wound around the outer peripheral surface of the plate cylinder 1 and fed. When it is determined that a predetermined amount of the unfinished master 8 has been transported by a predetermined number of steps of rotation of the master transport motor 10, the cutter 12 is actuated to cut the unengaged master 8 and the master When the rotation drive of the conveyance motor 10 is stopped, the rotation of the platen roller 9 and the conveyance roller pair 13 is stopped. When the rear end of the cut masterless master 8 is pulled out of the platemaking section 15 by the rotation of the plate cylinder 1 and completely wound on the outer peripheral surface of the plate cylinder 1, When the winding of the master 8 is finished, the plate-less plate feeding operation is finished.

  When the plate-less plate feeding operation is finished, the operation substantially similar to the operation example 3 is automatically executed. That is, the difference from the operation example 3 is that in the operation example 3, the surface plate-making image 8A of the divided plate-making master 8X wound on the surface region 1A of the plate cylinder 1 or the back surface region 1B of the plate cylinder 1 is wound. Instead of forming the front side print image or the back side print image by pressing the back side or the front side of the same front surface printed paper 36a against the press roller 21 to the back side plate making image 8B of the divided mastering master 8X mounted. Thus, the ink adhered to the outer peripheral surface of the press roller 21 is transferred and adsorbed to the surface of the thermoplastic resin film of the unmade master 8 wound on the plate cylinder 1, and the outer peripheral surface of the press roller 21 is operated. The point is that cleaning is performed in a shorter time than 3. Since the following operations can be easily understood and implemented from the operation example 3, the description thereof will be omitted.

  In the operation example 4, the printing pressure range variable means 28 is controlled so that the printing pressure ON timing by the press roller 21 in the printing pressure range pattern I shown in FIG. Although the back surface and the front surface of the same sheet 36 are alternately and repeatedly pressed only on the unprinted master 8 wound on the upper surface, the back surface region 1B of the plate cylinder 1 is not limited thereto. The same paper 36 is pressed repeatedly only on the unprinted master 8 wound on the upper surface or alternately on the unprinted master 8 on the front surface area 1A and the back surface area 1B. Alternatively, the printing pressure range varying means 28 may be controlled.

  By repeatedly pressing in this manner, the amount of ink transferred to the front and back surfaces of the same sheet 36 increases, so that after the repeated pressing is completed a plurality of times, the next sheet 36 is newly fed from the sheet feeding unit 30. A configuration may be adopted in which the same paper 36 is pressed and repeatedly pressed a plurality of times. Then, in the same manner as in the operation example 3, when the sorter or the discharge is configured to be switched to a plurality of discharge trays (discharge trays), the same sheet 36 repeatedly pressed is separately discharged to the sorter or the like. This is desirable from the standpoint of distinguishing from regular printed paper. Also, in the operation example 4, as in the operation example 3, for example, it is possible to set an arbitrary set number of times in place of the predetermined number of times when the plateless refeed cleaning mode is executed by the serviceman program. Alternatively, the predetermined number of times may be rewritten by a PROM.

  In the present embodiment, the re-feed cleaning mode and the plate-less and plate-free re-feed cleaning mode as shown in the operation examples 3 and 4 can be automatically executed only by pressing the keys 186 and 186A, and the press roller 21. Since the surface treatment of the outer peripheral surface portion of the film is performed as described above, there is no need to provide a cleaning roller (26) or the like as a cleaning means as disclosed in, for example, the above-mentioned JP-A-2003-200355. Although the apparatus configuration can be simplified, it is of course possible to add a cleaning roller (26) or the like as the cleaning means if such an advantage is not desired.

  According to the present embodiment, since it is as described above, it is possible to obtain the above-described effects and advantages, as compared with, for example, the double-sided printing apparatus (1) disclosed in JP-A-2003-200355, The paper guide 36 and the moving means 87 are newly provided as the paper clamping means, and the front-side printed paper 36a is temporarily held by the re-feed conveying device 104 in the re-feed means 45, and thereafter The front-side printed paper 36a is sent to a press roller 21 as a pressing means at a predetermined timing, reversed by the press roller 21, and fed again toward the printing nip portion 16a. This can be removed without the need for an auxiliary tray (8) as a refeed storage means as shown in FIG. Reduce the formation elements are those that can be realized a simple double-sided printing apparatus. Moreover, similarly to the double-sided printing apparatus (1) of the same publication, a single-sided printing can be performed without using a useless master, and a printed matter with good image quality without printed image density unevenness or printed image density difference during double-sided printing. It is an object of the present invention to provide a new one-drum one-pressing means double-sided printing type one-step duplex printing apparatus that can be obtained inexpensively and easily, and that can suppress an increase in installation space.

  Instead of the press roller 21 having a small diameter as in the above-described embodiment, the circumferential length of the peripheral surface of the press roller is merely the circumferential length of the front surface region 1A or the back surface region 1B on the outer peripheral surface of the plate cylinder 1. Are used, and those that satisfy this condition and have an integer ratio between the circumferential length of the plate cylinder 1 and the circumferential length of the plate cylinder 1, that is, those that have an integer ratio between the diameter and the diameter of the plate cylinder 1 are used. May be. With such a configuration, it becomes easy to set the peripheral speed of the press roller to the same speed as the peripheral speed of the plate cylinder. In this case, since the circumferential length of the press roller needs to be longer than the circumferential length of the front surface region 1A or the back surface region 1B on the outer peripheral surface of the plate cylinder, the diameter of the press roller and the plate cylinder The ratio to the diameter is preferably 1: 2 or 1: 3. If this ratio is larger than this, the diameter of the plate cylinder becomes too large, which hinders downsizing of the apparatus. Therefore, it is desirable that the diameter of the press roller is in the range of 1/2 to 1/3 of the diameter of the plate cylinder.

  Not only in the plate printing in the operation example 2 of the above embodiment, but when focusing on the basic functions of the plate printing, that is, in order to ensure ink bleeding, the divided master plate 8X is filled with ink and the plate cylinder 1 is used. Focusing on the basic function of printing, which is in close contact with the outer peripheral surface of the printing plate, the printing pressure range pattern III shown in FIG. 10 is selected, for example, in the same manner as printing during normal single-sided printing operation. You may set and perform the plate printing operation.

  In this case, if the maximum sheet passing size in the single-sided printing mode is A3 size, a normal single-sided printing operation can be performed by feeding A3 size paper 36, and as described above, it passes twice through the printing nip portion 16a. Saves time by eliminating the need for paper. In this case, A3 size paper 36 (so-called scraped paper such as damaged paper that has been printed on both sides) may be placed on the paper feed tray 35, and the paper may be fed and printed. In this case, in a double-sided printing apparatus having a plurality of paper feeding units, it is preferable that A3 size paper 36 exclusively for printing is loaded on any one of them and automatically fed and printed. In addition, the operation panel 173 and the like can be used to appropriately select and set the plate printing operation (process) in the double-sided printing mode and the plate printing operation (process) in the normal single-sided printing operation as desired by the user. In addition, it is of course possible to appropriately switch using the printing pressure range variable means 28.

  In the above embodiment, the document size detection sensor 149 and the paper size detection sensor 117 are used to cause the control apparatus 100 to recognize the plate-making image area and the paper size related to the document size. Two combinations of the detection sensor 149 and any one of the document size setting means for manually inputting and setting the document size and the paper size detection sensor 117 and any one of the paper size setting means for manually inputting and setting the paper size But you can. Since these operations can be carried out very easily from the above-described configuration and operation example, the description thereof will be omitted.

  In the operation example 2 of the above-described embodiment, the front side plate-making image 8A as the first plate-making image and the back side plate-making image 8B as the second plate-making image are formed side by side along the rotation direction of the plate cylinder 1. The operation of performing duplex printing in this order when the divided master-making master 8X is wound around the plate cylinder 1 has been described. However, the duplex printing may be performed in the reverse order.

  In the above embodiment, the case of a stencil printing method using a master is illustrated as an example of a double-sided printing device, but the present invention is not limited to this, and can be applied mutatis mutandis to a printing device of a principle other than the stencil printing method. For example, using a lithographic plate (regardless of the presence or absence of dampening water) as a printing plate used in an offset printing machine or the like, it is relatively easy to implement a direct printing type.

It is a partial cross section front view of the principal part of the double-sided stencil printing apparatus which shows the 1st Embodiment of this invention. FIG. 2 is an enlarged partial cross-sectional front view showing a configuration and operation around a printing unit, a refeed unit, and a printing pressure range variable unit of the double-sided stencil printing apparatus in FIG. 1. FIG. 2 is an enlarged partial cross-sectional front view illustrating a configuration around a printing unit, a refeed unit, a printing pressure range variable unit, and a surface printing operation of the double-sided stencil printing apparatus in FIG. FIG. 2 is an enlarged partial cross-sectional front view illustrating a double-sided printing operation in parallel with a printing unit, a re-feeding unit, a configuration around a printing pressure range variable unit, and a front-side printed paper conveying operation of the double-sided stencil printing apparatus in FIG. 1. It is a partial cross section side view around the printing pressure range variable means of the double-sided stencil printing apparatus in FIG. It is a front view of the principal part of the printing pressure range variable means of the double-sided stencil printing apparatus in FIG. It is a front view of the principal part of the printing pressure range variable means of the double-sided stencil printing apparatus in FIG. FIG. 2 is a partial cross-sectional front view around a moving guide and moving means of the double-sided stencil printing apparatus in FIG. 1. FIG. 2 is a partial cross-sectional front view around a movement guide, a release cam, and a release pin of the double-sided stencil printing apparatus in FIG. 1. FIG. 3 is a diagram for developing and explaining three printing pressure range patterns applied corresponding to a divided master-making master on a plate cylinder used in the double-sided stencil printing apparatus in FIG. 1. FIG. 2 is a perspective view showing an arrangement example of a sheet feeding start light shielding plate and a resist start light shielding plate used in the double-sided stencil printing apparatus in FIG. 1 on an end plate of a plate cylinder. FIG. 2 is a front view of a main part showing a drive mechanism of a paper feed roller and a registration roller of a paper feed unit of the double-sided stencil printing apparatus in FIG. 1. FIG. 2 is a perspective view of a main part of a paper size detection unit disposed in a paper feed tray of a paper feed unit of the double-sided stencil printing apparatus in FIG. 1. It is a front view of the principal part of the image reading part of the double-sided stencil printing apparatus in FIG. It is a top view of the principal part of the operation panel of the double-sided stencil printing apparatus in FIG. It is a block diagram which shows the control structure of the principal part of the double-sided stencil printing apparatus in FIG. It is a front view of the principal part explaining the problem of the conventional double-sided stencil printing apparatus. It is a front view of the principal part explaining the problem of the conventional double-sided stencil printing apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plate cylinder 2 Ink roller 8 Master 8A The surface plate-making image 8B as a 1st plate-making image 8C The back surface plate-making image 8C as a 2nd plate-making image Intermediate intermediate plate-making area 8X Divided plate-making master 8Y Plate-making master 8YA Single-side plate-making image 11 Plate-making Thermal head 15 as means Plate making part 16 Printing part 16a Printing nip part 17 Plate discharging part 18 Image reading part 19 Paper discharge part 20 Main motor 21 as plate cylinder driving means Press roller constituting refeed means as pressing means 27, a printing pressure cam 28 constituting printing pressure range changing means, printing pressure range changing means 30, paper feeding unit 32, paper detection sensor 33 as paper detection means, paper feeding roller 35 as paper feeding means, paper feeding tray 36 as paper feeding table Paper 36a Front-side printed paper 36b Double-sided printed paper 36c Single-sided printed paper 45 Refeed means 46 Switching means Switching guide 47 Solenoid 50 as switching drive means Roller guide plate 51 as refeeding guide member Refeeding roller 52 as refeeding roller member Refeeding sensor 62 as surface printed paper detecting means Locking means First solenoid 64 constituting the locking mechanism 67 Intermittent cam 77 constituting the printing pressure range varying means Second solenoid 81 as the intermittent cam driving means constituting the printing pressure range varying means Movement guide 81b as the sheet clamping means As the clamping member Clamping claw 82 Release lever upper 83 Release lever lower 87 Moving means 88 Guide groove 98 as guiding means constituting moving means Release cam 99 constituting operation time control means Release pin 100 Control device 101 as control means CPU
102 ROM
104 Refeed transport device 173 Operation panel 200 Double-sided stencil printing device P1 as an example of a double-sided printing device P1 Movement position P2 as a first position X Initial position as a second position X Paper transport direction X1 Master transport direction

Claims (10)

Relative to the plate cylinder and the plate cylinder on which the divided plate-making master is formed, in which the first plate-making image and the second plate-making image are formed side by side along the rotation direction of the plate cylinder. A printing unit having a detachable pressing means;
A paper feeding unit that feeds paper toward the printing unit;
A paper discharge unit for discharging printed paper printed by the printing unit;
The printing unit temporarily holds the surface-printed paper having the printed image formed on the surface corresponding to the first plate-making image or the second plate-making image, and then presses the surface-printed paper on the pressing means. Refeeding means for sending out and reversing by the pressing means and refeeding toward the printing section;
A second position in the vicinity of the upstream side of the re-feeding means that sandwiches the front end of the surface-printed paper fed from the printing section in the vicinity of the first position in the vicinity of the printing section. And a paper clamping means for opening the front end of the front surface printed paper,
Moving means for reciprocating the sheet clamping means between a first position and a second position;
When the paper clamping means occupies the first position, the paper clamping means is opened once and then operated so as to clamp the front end of the surface printed paper. An operation timing control means for operating the paper clamping means to open the front end of the surface-printed paper when the position is occupied;
Switching means for guiding the paper that has passed through the printing section to the paper clamping means or the paper discharge section;
A double-sided printing apparatus capable of printing on both sides of a sheet of paper with one rotation of the plate cylinder. Relative to the plate cylinder and the plate cylinder on which the divided plate-making master is formed, in which the first plate-making image and the second plate-making image are formed side by side along the rotation direction of the plate cylinder. A printing unit having a detachable pressing means; a paper feeding unit that feeds the paper toward the printing unit; a paper discharge unit that discharges printed paper printed by the printing unit; and After temporarily holding the surface-printed paper on which the printed image is formed on the front surface, the surface-printed paper is sent out toward the pressing unit, reversed by the pressing unit, and re-feeded toward the printing unit. A double-sided printing apparatus comprising: a paper re-feeding unit configured to switch; and a switching unit that guides the paper that has passed through the printing unit to the paper re-feeding unit or the paper discharge unit.
A second position in the vicinity of the upstream side of the re-feeding unit that sandwiches the front end of the surface-printed paper fed from the printing unit in the vicinity of the first position in the vicinity of the printing unit. And a paper clamping means for opening the front end of the front surface printed paper,
Moving means for reciprocating the sheet clamping means between a first position and a second position;
When the paper clamping means occupies the first position, the paper clamping means is opened once and then operated so as to clamp the front end of the surface printed paper. An operation timing control means for operating the paper clamping means to open the front end of the surface-printed paper when the position is occupied;
A double-sided printing apparatus comprising: The double-sided printing apparatus according to claim 1 or 2,
The double-sided printing apparatus, wherein the operation timing control means has a cam. The double-sided printing apparatus according to any one of claims 1 to 3,
The paper clamping means has an openable / closable clamping member that clamps the front end of the surface-printed paper,
The double-sided printing apparatus, wherein the sandwiching member is inclined in the traveling direction of the front surface printed paper fed from the printing unit. The double-sided printing apparatus according to any one of claims 1 to 4,
In the state in which the plate cylinder is wound with the divided pre-printed master, the same body as the front-side printed paper or the same paper as the double-sided printed paper on which the printed image is formed on the back side thereof by the printing unit The printing unit, the refeeding unit, the switching unit, and the switching unit are configured to press the sheet a predetermined number of times between the plate cylinder and the pressing unit while re-feeding the sheet, and then discharge the sheet to the sheet discharging unit. A double-sided printing apparatus comprising control means for controlling a moving means. The double-sided printing apparatus according to any one of claims 1 to 4,
The paper discharge unit after the plate cylinder is pressed a predetermined number of times between the plate cylinder and the pressing means while re-feeding the same paper in the apparatus main body with the unprinted master wound around the plate cylinder A double-sided printing apparatus comprising: a control unit that controls the printing unit, the re-feeding unit, the switching unit, and the moving unit so as to be discharged. Relative to the plate cylinder and the plate cylinder on which the divided plate-making master is formed, in which the first plate-making image and the second plate-making image are formed side by side along the rotation direction of the plate cylinder. A printing unit having a detachable pressing means; a paper feeding unit that feeds the paper toward the printing unit; a paper discharge unit that discharges printed paper printed by the printing unit; and After temporarily holding the surface-printed paper on which the printed image is formed on the front surface, the surface-printed paper is sent out toward the pressing unit, reversed by the pressing unit, and re-feeded toward the printing unit. A double-sided printing apparatus comprising: a paper re-feeding unit configured to switch; and a switching unit that guides the paper that has passed through the printing unit to the paper re-feeding unit or the paper discharge unit.
In the state in which the plate cylinder is wound with the divided pre-printed master, the same body as the front-side printed paper or the same paper as the double-sided printed paper on which the printed image is formed on the back side thereof by the printing unit The printing unit, the refeed unit, and the switching unit are controlled so that the plate cylinder and the pressing unit are pressed a predetermined number of times while being re-feeded in the printer, and then discharged to the paper discharge unit. A double-sided printing apparatus comprising: Relative to the plate cylinder and the plate cylinder on which the divided plate-making master is formed, in which the first plate-making image and the second plate-making image are formed side by side along the rotation direction of the plate cylinder. A printing unit having a detachable pressing means; a paper feeding unit that feeds the paper toward the printing unit; a paper discharge unit that discharges printed paper printed by the printing unit; and After temporarily holding the surface-printed paper on which the printed image is formed on the front surface, the surface-printed paper is sent out toward the pressing unit, reversed by the pressing unit, and re-feeded toward the printing unit. A double-sided printing apparatus comprising: a paper re-feeding unit configured to switch; and a switching unit that guides the paper that has passed through the printing unit to the paper re-feeding unit or the paper discharge unit.
The paper discharge unit after the plate cylinder is pressed a predetermined number of times between the plate cylinder and the pressing means while re-feeding the same paper in the apparatus main body with the unprinted master wound around the plate cylinder A double-sided printing apparatus comprising: a control unit that controls the printing unit, the re-feeding unit, and the switching unit so as to be discharged into the printer. The double-sided printing apparatus according to claim 6 or 8,
There is a plate-free plate feeding means capable of transporting and winding the master of the unprinted plate to the plate cylinder,
The double-sided printing apparatus, wherein the control means controls the non-plate making plate feeding means so as to automatically feed the unprinted master to the plate cylinder. The double-sided printing apparatus according to any one of claims 5 to 9,
A first printing pressure range pattern for applying a printing pressure only to a first image area corresponding to a first plate-making image in the divided plate-making master on the plate cylinder; A second printing pressure range pattern that applies a printing pressure only to the second image area corresponding to the second plate-making image, and a second printing pressure that is applied to the second image area continuously from the first image area. A printing pressure range variable means capable of selectively switching to one of at least three printing pressure range patterns and three printing pressure range patterns;
The control means selects one of the first printing pressure range pattern and the second printing pressure range pattern when pressing the predetermined number of times, or selects the first printing pressure range pattern. A duplex printing apparatus, wherein the printing pressure range variable means is controlled so as to alternately select a pressure range pattern and a second printing pressure range pattern.

Images