JP2006321076A - Stencil process printing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stencil process printing device which can easily remove a jamming piece of a sheet generated by its curling to a drum. <P>SOLUTION: This stencil process printing device comprises the following components: a unit opening/closing means 68 positioned on the sheet discharge side of the drum 48 arranged in an enclosure 9, a unit opening/closing switch 111 for detecting the opening/closing of the opening/closing means 68, a drum drive means 113 for rotating the drum 48, a drum rotary position detecting sensor 102 for detecting the rotary position of the means 113, a jam display means 99 for detecting the curling of the sheet P to the drum 48, a jam display means A2 for displaying the curling of the sheet P, and a corrective rotary means A1 for correctively rotating the drum 48 to an appropriate position P1 where the tip of the sheet P can be easily removed from the drum 48. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stencil printing apparatus, and more particularly to a stencil printing apparatus provided with a paper removal mechanism that removes paper when a paper jam occurs inside the printing press.

  Using a plate cylinder (drum) made of a porous support cylinder, etc. and a master with a laminate structure in which a porous support is bonded to a thermoplastic resin film, for example, the master thermoplastic resin film is heated and melted with a thermal head. After perforating and making the plate, it is wound around the plate cylinder, an appropriate amount of ink is supplied to the inner peripheral surface of the plate cylinder by the ink supply means provided inside the plate cylinder, and the paper is fed by pressing means such as a press roller or an impression cylinder. 2. Description of the Related Art There is known a thermal digital stencil printing apparatus that performs printing by transferring ink oozed from an opening portion of a plate cylinder and a perforation portion of a master onto a sheet by pressing the plate cylinder.

  In the stencil printing apparatus described above, the paper to which the ink is transferred by being pressed against the plate cylinder by the pressing means floats up from the master wound on the plate cylinder by its own waist, and the peeling claw is formed in the space formed by this lifting. Is inserted from the outer peripheral surface of the plate cylinder and discharged. However, if the amount of ink adhering to the paper increases due to the fact that the image formed on the paper has a solid part or the fluidity of the ink is improved in summer, the paper will stick to the plate cylinder. The formed space becomes narrow and the insertion of the tip of the peeling claw becomes unstable, causing a problem called “rolling up” in which the sheet is not discharged while being stuck to the plate cylinder. When this roll-up occurs, ink transfer from the master is not performed on the following papers, so all the papers are blank and printing failure occurs. When the master is discharged together with the rolled-up paper, a paper discharge jam occurs. May occur, or in the worst case, the plate removal unit may be damaged.

  Therefore, the paper discharge detection mechanism accurately detects the paper roll-up, and the paper is removed at the time of detection. For example, there is known a paper discharge detection mechanism in which a paper discharge timing sensor for detecting paper discharge timing from the plate cylinder is provided in the vicinity of the plate cylinder and a paper discharge detection sensor for detecting paper in the vicinity of the paper discharge conveyance member. ing. In this case, if the paper discharge detection sensor detects the paper when the paper discharge timing sensor is activated, it is determined that the paper has been correctly discharged. If the paper discharge detection sensor does not detect the paper when the paper discharge timing sensor is activated, the paper is wound. It is determined that a rise has occurred, the printing operation is stopped, and the paper is removed.

  Alternatively, a sensor pattern made of a black member that absorbs light is directly provided on the plate cylinder, and the sensor pattern emits detection light from the reflection-type paper discharge detection sensor to receive the reflected light, so that the sheet is wrapped around the plate cylinder. Is detected, the printing operation is stopped, and the paper wound around the plate cylinder is removed. A roll-up detection mechanism using the sensor pattern and the reflection type paper discharge detection sensor is disclosed in Japanese Patent Laid-Open No. 2002-154260 (Patent Document 1).

JP 2002-154260 A

  By the way, when the paper is wound around the plate cylinder and the printing is stopped, it is necessary to open the side wall of the casing of the stencil printing apparatus in order to perform the operation of removing the paper (jam paper) wound up on the plate cylinder. However, when the opening is provided on the side wall of the housing, it is formed as small as possible except for the paper entrance. From the viewpoint of noise and safety, the opening is the minimum necessary except for the paper conveyance path. Furthermore, the present situation is that a plurality of printing units are arranged close to each other around the plate cylinder inside the casing, and the gap for removing jammed paper adhering at that point is relatively small and limited.

Further, when the plate cylinder stops rotating, it normally stops at the normal drum standby position. In this case, the leading edge of the rolled-up paper is located below, and when removing it by removing it from the drum, It gets in the way and is difficult to work with.
Therefore, if a paper jam occurs inside the stencil printing machine, in order to remove the paper, the pre-operation of opening the door cover and removing the drum unit consisting of the heavy plate cylinder and the integrated accessory is indispensable. It was inconvenient.
Further, by removing the drum unit, a place for temporarily placing the drum unit becomes necessary. Most of the work is assumed to be placed on a nearby floor, and the drum unit is accidentally touched during the jam paper processing, and clothes and the like are easily soiled, and the drum unit is easily damaged.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a stencil printing apparatus that can easily remove jammed paper generated by winding of paper onto a drum. .

In order to solve the above-mentioned problems and achieve the above object, the present invention employs the following invention specific matters (hereinafter referred to as “configuration”) in the invention of each claim. It is.
According to a first aspect of the present invention, there is provided an opening / closing means for a unit located on the paper discharge side of a drum disposed in the housing, an opening / closing detection means for detecting opening / closing of the opening / closing means, and a rotating means for rotating the drum. Rotation position detection means for detecting the rotation position, roll-up detection means for detecting that the paper has been wound on the drum, jam display means for notifying that the paper has been wound, and that the roll-up has occurred And a control means for correcting and rotating the drum to an appropriate position where the leading edge of the paper is easily removed from the drum.
Here, the unit includes a plate discharging unit for storing a master which is no longer necessary.

  According to a second aspect of the present invention, in the stencil printing apparatus according to the first aspect, the drum is displayed on the jam display means after the drum is rotated to an appropriate position where the paper is easily removed from the drum by the correction rotation. .

  According to a third aspect of the present invention, in the stencil printing apparatus according to the first or second aspect of the present invention, the stencil printing apparatus has a switch capable of manually operating the correction rotation of the drum. Features.

  According to a fourth aspect of the present invention, in the stencil printing apparatus according to the third aspect of the invention, the control means rotates the drum for correction only while the manual switch is pressed.

  According to a fifth aspect of the present invention, in the stencil printing apparatus according to any one of the first to fourth aspects, the correction rotation is performed at a speed lower than a minimum speed of a normal printing operation.

  According to a sixth aspect of the present invention, in the stencil printing apparatus according to any one of the first to fifth aspects, the control unit correctively rotates the drum in the same direction as when the paper is discharged. It is characterized by.

  According to a seventh aspect of the present invention, in the stencil printing apparatus according to any one of the first to sixth aspects, the control means prohibits correction rotation of the drum except for a specific jam.

  The invention according to claim 8 is the stencil printing apparatus according to claim 1, further comprising standby position detecting means for detecting the standby position of the drum, wherein the control means closes the unit by the open / close detecting means. After detecting this, if the drum is not in the standby position, the drum is rotated to the standby position.

  According to the present invention, a novel stencil printing apparatus can be provided by solving the above-described conventional problems. The effects for each claim are as follows.

  According to the present invention, when the paper rolls up on the drum, the unit located on the drum discharge side is opened, and the drum is corrected and rotated from the position where the drum is stopped, for example, the normal drum standby position. Therefore, the drum can be easily corrected and rotated so that the leading edge of the paper is easily removed from the drum, and the leading edge of the paper can be corrected to a position that is easy for the user to understand.

  According to the present invention, the jam processing can be performed smoothly by displaying the jam to the user after the jam processing is enabled.

  According to the present invention, the operability is improved by providing a switch for manually operating the drum on the paper discharge side close to the jam processing position.

  According to the present invention, since the drum can be rotated as the user desires, such as intermittent operation, the workability when removing the paper is improved.

  According to the present invention, safety can be taken into consideration, and the user can perform the jam processing with confidence (claim 5).

  According to the present invention, it is easy to peel off the paper from the drum by setting the rotation only in the direction of discharging the paper.

  According to the present invention, it is possible to prevent problems that may occur secondarily (for example, waste of recovery processing time) by prohibiting operations when they are not needed (claim 7).

  According to the present invention, the next printing can be smoothly performed by returning the drum unit to the normal standby position.

Hereinafter, embodiments of the present invention (hereinafter referred to as “embodiments”) will be described. In each embodiment, components (members and components) having the same function, shape, and the like will be omitted by giving the same reference numerals after having been described once.
With reference to FIG. 1, an overall configuration of a stencil printing apparatus 1 showing a first embodiment of the present invention will be described. As shown in FIG. 1, the stencil printing apparatus 1 is mainly composed of an image reading unit 2, a paper feeding unit 3, a plate making unit 4, a printing unit 5, a plate discharging unit 6, a paper discharge unit 7, and a control unit 8. . In the figure, reference numeral 9 denotes a housing as an apparatus main body forming the framework of the stencil printing apparatus 1.

  The outer shell of the stencil printing apparatus 1 is formed of a substantially box-shaped housing 9, and the whole is placed on a storage cabinet CB as shown in FIGS. The main part of the front side wall 901 of the housing 9 is covered with a front cover 902 which is a laterally open lid, and the lower part of the right side wall is covered with a vertically opened paper supply lid 903 (see FIG. 10). Shows closed state). The left side of the housing 9 is between the left and right vertical long walls 904 and 905, and a paper discharge port m through which the paper P is discharged is formed at the lower part thereof. One side frame portion of the image reading unit 2 which is a scanner unit is disposed on the edge side. An image reading unit 2 which is a scanner unit is provided in the main part of the upper part of the casing 9 of the stencil printing apparatus 1, and an input switch for operating mode of the stencil printing apparatus 1 or the like is provided in the vicinity of the front side edge. An operation panel 90 (see FIGS. 9 and 10) having a display panel or the like for displaying operation, operation instruction values and driving conditions is provided.

As shown in FIGS. 1, 9, and 10, the image reading unit 2, which is a scanner unit, is disposed on the upper portion of the housing 9 and is not illustrated and is transported from the document placing table 11 or a contact glass 10. It has a function and configuration for reading an image of a document (not shown) placed thereon.
The image reading unit 2 includes a contact glass 10 for placing a document, a document placing table 11 for placing a document, a pair of document transport rollers 12 and a document transport roller 13 for transporting a document, and a guide plate 14 for guiding the transported document. , 15, a document transport belt 16 for transporting a document along the contact glass 10, a switching plate 17 for switching the discharge direction of the read document, a document discharge table 18 for discharging the read document, and scanning a document image. A scanner unit (a fluorescent lamp 21 that illuminates the surface of the document through the contact glass 10, mirrors 19 and 20 that reflect and reflect the reflected light from the surface of the document, a lens 22 that focuses the reflected light reflected by these mirrors, It is mainly composed of an image sensor 23) such as a CCD that receives reflected light through the lens 22.

The image sensor 23 performs photoelectric conversion in response to the received reflected light, and an image signal obtained thereby is analog / digital (hereinafter referred to as “hereinafter,“ I / O port side) of the control unit 8 provided in the housing 9. (Abbreviated as “A / D”).
Of the above-described configuration, the document placing table 11, the document conveying roller pair 12, the document conveying roller 13, the guide plates 14 and 15, the document conveying belt 16, the switching plate 17, and the document discharge table 18 are arranged on the pressure plate C shown in FIG. The ADF unit 24 is integrally provided to be configured so as to perform a known automatic document reading operation.

  A plate-making conveyance unit (plotter unit) 4 is disposed below the image reading unit 2. The plate-making transport unit 4 includes a master roll holding member 40, a platen roller 42, a thermal head 43, a cutting means 44, a master transport roller pair 45, 46, and the like. The master roll holding member 41 is fixed to the side plate 47 of the plate making transport unit 4.

  The master roll holding member 40 rotatably and detachably supports a core portion 41b of a master roll 41a formed by winding a master 41 in which a thermoplastic resin film and a porous support are bonded together in a roll shape. The platen roller 42 is rotationally driven in a clockwise direction in the figure by a stepping motor (not shown), and the thermal head 43 is pressed against the platen roller 42 by an urging means (not shown). The cutting means 44 having an upper blade and a lower blade cuts the master 41 as the upper blade moves up and down relative to the lower blade. A pair of master transport rollers 45 and 46 including a drive roller and a driven roller pressed against the drive roller sandwich and transport the master 41 between the rollers.

  Below the plate-making transport unit (plotter unit) 4, a paper feed unit 3 as a paper feed unit is disposed. The sheet feeding unit 3 includes a sheet feeding table 32, a sheet feeding roller 33, a separation roller 34, a registration roller pair 35, guide plates 36 and 37, and the like. The paper feed table 32 on which the paper P is stacked is supported by a drive mechanism (not shown) so as to be movable up and down. A paper feed roller 33 disposed above the paper feed tray 32 and driven to rotate in the clockwise direction in the drawing by a driving means (not shown) is predetermined with respect to the uppermost paper P stacked on the paper feed tray 32. Weld with pressure of. The separation roller 34 disposed in the vicinity of the left side of the paper feed roller 33 is disposed in pressure contact with a separation pad (not shown) at a predetermined pressure, and the paper feed roller 33 is driven by driving force transmission means (not shown). The force is transmitted and is driven to rotate in synchronization with the paper feed roller 33 in the same direction. On the left side of the separation roller 34, a registration roller pair 35 including a driving roller and a driven roller disposed in pressure contact with the driving roller is disposed. The driving roller of the registration roller pair 35 is rotated by driving means (not shown), and the registration roller pair 35 temporarily stops one sheet P sent by the separation roller 34 and then directs it toward the printing unit 5 at a predetermined timing. To feed.

  A paper jam detection sensor 97 that detects a jam when the paper P is not sent to the registration roller pair 35 within a predetermined time is disposed on the right side of the registration roller pair 35. Guide plates 36 and 37 fixed to a plate-making side plate (not shown) on the housing 9 side are disposed on the left side of the registration roller pair 35, and a paper feed path is formed by the guide plates 36 and 37. .

  A printing unit 5 is disposed on the left side of the paper feeding unit 3. The printing unit 5 is mainly composed of a drum 48, a press roller 58 as pressing means, and the like. As shown in FIGS. 1 and 2A, a drum 48, which is a plate cylinder provided detachably with respect to the housing 9, is formed by etching a stainless steel thin plate or a nickel electroformed thin plate. The porous support plate 48a has a plurality of holes 48b having a diameter of about 0.15 to 0.5 mm at intervals of about 0.25 to 1.0 mm. On the surface of the opening of the porous support plate 48a, about 1 to 3 layers of mesh screens (not shown) having a mesh number of about 100 to 400 woven with polyester or stainless fine wires are wound. On the surface of the non-opening part e1 without the hole 48b of 48a, a stage part 50 consisting of a flat surface extending in the axial direction of the drum 48 and a clamper 51 for clamping the tip of the master 41 together with the stage part 50 are arranged. ing. The clamper 51 is provided with a magnet (not shown) so as to be magnetically attached to the stage unit 50. The clamper 51 is opened and closed by opening / closing means (not shown) when the drum 48 reaches a predetermined standby position (see FIG. 2A), and receives and clamps the leading end of the master 41 from the plate-making conveyance unit 4 there. Both ends of the porous support plate 48a (front and back ends in FIGS. 1 and 2A) are provided with flanges (not shown), and each flange also serves as an ink supply pipe fixed to the housing 9. The support shaft 52 (see FIG. 1) is rotatably supported via a bearing (not shown).

  A flange encoder (not shown) that integrally detects a drum rotation angle is integrally formed on a flange (not shown), and a drum rotation position detection sensor 102 (see FIG. 5) serving as a rotation position detection means that is a transmission optical sensor is disposed opposite to the flange encoder (not shown). A pulse for each predetermined unit angle is counted by the drum rotation position detection sensor 102 in an ECU (to be described later), and the current drum rotation position is detected. Further, a shutter plate (see FIG. 5) 103 for detecting the drum standby position (reference position) P2 and a standby position detection sensor 101 are arranged opposite to the flange (not shown), and the standby position is a transmission type optical sensor. The drum standby position (reference position) P2 of the drum 48 is detected according to the pulse signal of the detection sensor 101.

  In addition, a sensor pattern 53 as a detection piece is provided in the non-opening e1 of the porous support plate 48a that is located to the left of the clamper 51 in FIG. The sensor pattern 53 is composed of a black member that absorbs light, and is formed at one place over a predetermined length in the center in the width direction of the porous support plate 48a.

  As shown in FIG. 1, ink supply means 54 is disposed inside the drum 48. The ink supply means 54 is mainly composed of a support shaft 52, an ink roller 55, and a doctor roller 56. A large number of small-diameter holes for supplying ink into the drum 48 are formed on the surface of the support shaft 52, and an ink roller 55 and a doctor roller 56 are disposed below the holes. The ink roller 55 and the doctor roller 56 are rotatably supported between side plates (not shown) provided in the drum 48, and are rotated in opposite directions by driving means (not shown). The ink roller 55 and the doctor roller 56 are arranged close to each other so that a slight gap is generated between the outer peripheral surfaces, and a wedge-shaped ink reservoir 57 is formed in the vicinity of each outer peripheral surface. The ink supplied from the support shaft 52 to the ink reservoir 57 is formed into a uniform layer when passing through the gap between the ink roller 55 and the doctor roller 56, and the inner periphery of the drum 48 is interposed via the outer peripheral surface of the ink roller 55. Supplied to the surface.

Below the drum 48, there is disposed a rotatable press roller 58 that is supported by a swinging means (not shown) and whose outer peripheral surface is press-separated with a predetermined pressing force with respect to the outer peripheral surface of the drum 48. ing. The press roller 58 presses the paper P fed from the paper feeding unit 3 against the drum 48 and forms a print image on the paper P.
On the left side of the printing unit 5, a plate discharging unit 6 as a plate discharging unit is disposed. The plate discharging unit 6 is mainly composed of an upper plate discharging member 61, a lower plate discharging member 62, a plate discharging box 63, and the like, and the entirety is accommodated in a plate discharging frame body 64.
Here, the discharge plate frame 64 is integrally attached with a discharge plate lid 66 that covers a discharge plate opening 65 formed on one side wall of the housing 9, and the whole can be detached into the internal space E from the discharge plate opening 65 on the side wall of the housing. At the time of fitting, the drum 48 is attached at a position on the paper discharge side.

As shown in FIGS. 5 and 9, the left side wall of the housing 9 is formed with a plate release opening 65 at the upper part between the left and right vertical walls 904 and 905, and this is normally closed by the plate release unit 6.
As shown in FIGS. 1 and 5, the plate discharge cover 66 as an opening / closing cover has one pivotal support edge attached to the left longitudinal long wall 904 of the housing via a hinge member 67, and the other side edge is a rotation. The edge can be locked by the unit opening / closing means 68 so as to be opened and closed.
The unit opening / closing means 68 has a protruding pin 69 projecting on the rotating end side of the plate removing frame 64, a locking member 71 mounted on the right vertical wall 905 of the housing 9, and a locking release operation for the locking member 71. And a discharge unit opening / closing button 72 to be discharged.

  The protruding pin 69 is formed so as to be able to fit to the back side of the cut 73 provided in the inner vertical wall 906 of the right vertical wall 905. The inner vertical wall 906 is the back surface thereof, and the locking member 71 is coupled to the vicinity of the notch 73 by the support pin 74. The support pin 74 is supported by the inner vertical wall 906 and pivotally supports the boss portion 711 of the locking member 71. The locking member 71 is formed with a hook 712 capable of locking the protruding pin 69 at the opposite end of the notch 73, extending a downward piece 713 below the boss 711, and protruding a pressing piece 714 horizontally from the downward piece 713. Forming. The pressing piece 714 is formed so as to face the discharge unit opening / closing button 72. Note that the locking member 71 is biased around the support pin 74 in the locking direction by a spring (not shown).

  A substantially rectangular recess 907 is formed at a position that does not interfere with the plate discharge lid 66 at a position lateral to the plate discharge opening 65 of the right vertical wall 905, and a plate release unit opening / closing button 72 is slidably inserted therein. The plate release unit opening / closing button 72 includes a rectangular main portion 721, a peripheral flange portion 722, a central protrusion 723 that extends from the center of the back side of the main portion 721 and faces the pressing piece 714, and between the bottom plate of the main portion 721 and the recess 907. And a spring 724 to be deployed. The main portion 721 side is held in a state of being protruded and biased by the spring 724 in a state where excessive protrusion is restricted by a not-illustrated locking portion, and the locking member 71 is supported by the support pin 74 by being pressed. The hook 712 that rotates around and locks the protruding pin 69 can be operated in the unlocking direction.

  As shown in FIG. 5, a unit opening / closing detection switch 111 is provided near the deepest portion of the notch 73 of the inner vertical wall 906 and pressed off by the support pin 74 and turned on when the support pin 74 is detached. The ON signal is output to the I / O port 803 of the control unit 8. Further, a drum rotation switch 110 for manually operating the correction rotation of the drum 48 is provided in the vicinity of the paper discharge side, and is configured so that the drum 48 can be rotated at a very low speed.

In this way, the plate discharging portion 6 whose one end is pivotally supported by the left vertical wall 904 is supported so as to be openable and closable in a laterally open state with respect to the plate discharging opening 65, and is released to the right vertical wall 905 by the action of the unit opening / closing means 68. Locked as possible.
The upper plate discharging member 61 provided in the plate discharging frame body 64 is mainly composed of a driving roller 80 and a driven roller 81 that are rotationally driven by a driving means (not shown), and an endless belt 82 that is stretched between the rollers. Yes. The lower plate removal member 62 is mainly composed of a driving roller 84 and a driven roller 85 that are coupled to the driving roller 80 by a gear (not shown) and driven to rotate, and an endless belt 86 that is stretched between the rollers. The lower plate removal member 62 is provided so as to be movable in the left-right direction by a moving means (not shown) around the support shaft of the drive roller 80, and an endless belt 86 positioned on the outer peripheral surface of the drive roller 84 is provided on the outer peripheral surface of the drum 48. It is comprised so that it can contact / separate with respect to. A plate discharging box 39 disposed opposite to the upper and lower plate discharging members 61, 61 is used to store a used master, and is detachably attached to the plate discharging frame body 64. A compression plate (not shown) for compressing the master 41 is provided.

As shown in FIG. 1, air is sent to the lower wall of the discharge plate frame 64 by a fan 105 at a position closer to the downstream side in the paper discharge direction with respect to a later-described peeling claw 88 to assist in peeling the paper P. An air knife 106 is provided.
A paper discharge unit 7 is disposed below the plate discharge unit 6 serving as a plate discharge unit. The paper discharge unit 7 includes a peeling claw 88, a guide plate 89, a paper discharge conveying member 91, a paper discharge tray 92, and the like.

  A plurality of peeling claws 88 for peeling the paper P from the outer peripheral surface of the drum 48 in cooperation with the air knife 106 are disposed in the axial direction of the drum 48, and each has a sharp tip. . Each peeling claw 88 has a base portion supported by a claw rocking means (not shown) provided in the housing 9, and is rocked by a claw rocking means (not shown) so that each tip end is an outer peripheral surface of the drum 48. Are provided so as to be swingable integrally with each other so as to be close to and away from each other. A guide plate 89 is disposed on the left side of the press roller 58 and below the peeling claw 88. The guide plate 89 is fixed to a side plate (not shown) of the housing 9, and guides the paper P peeled off from the outer peripheral surface of the drum 48 by each peeling claw 88 to the paper discharge conveyance member 91.

  The paper discharge conveyance member 91 includes a driving roller 92 and a driven roller 93 that are driven to rotate counterclockwise in FIG. 1 by a driving unit (not shown), a plurality of endless belts 94 spanned between the rollers, a suction fan 95, A paper discharge detection sensor 96 or the like is provided, and the paper P is conveyed toward the left in FIG. 1 while being held on the endless belt 94 by the suction force of the suction fan 95.

As shown in FIG. 2B, the paper discharge detection sensor 96 as a paper discharge detection unit is configured to receive the paper P on which the image is transferred by being pressed from the drum 48 by the press roller 58 and fed from the paper feed unit 3. When the sheet is peeled off from the outer peripheral surface of the drum 48 by the peeling claw 88 in cooperation with the air knife 106 and sent onto the paper discharge conveying member 91, the leading edge of the paper P is detected and a signal is output. A paper discharge tray 98 is disposed on the left side of the paper discharge conveyance member 91. A paper discharge tray 98 on which printed paper P is stacked is provided with a pair of side fences 981 and end fences 982 that align the paper P.
Further, a roll-up detection sensor 99 serving as a roll-up detection unit is disposed around the drum 48 and above the peeling claw 88.

  The roll-up detection sensor 99, which is a reflection type sensor, emits detection light toward the master 41 on the drum 48 when the discharge detection sensor 96 reaches the detection position P0 when the discharge of the paper P is detected. Irradiate. When the detection light is irradiated at the detection position P0, the detection light is absorbed by the sensor pattern 53 if the paper P is satisfactorily peeled from the outer peripheral surface of the drum 48 as shown by the solid line in FIG. The sheet P is not reflected by the roll-up detection sensor 99, but the paper P is drum 48 at a predetermined appropriate position P1 (a position obtained by adding the rotation stop distance to the detection position) indicated by a two-dot difference line in FIGS. , The detection light hits the paper P and is reflected and received by the roll-up detection sensor 99 to generate a roll-up detection signal. Here, the proper position P1 is a position that is suitable for removing the roll-up sheet, which will be described later, from the drum 48 that has stopped, using the discharge plate opening 65, and the drum 48 enters a stop operation at the proper position P1. 48 is set as a position estimated to stop after rotating the rotation stop distance.

  As shown in FIG. 7, the control unit 8 as a control unit includes a CPU 800, and the CPU 800 includes an operation program stored in the ROM 801 and each sensor input to the I / O port 803 in the control unit 8. The I / O port 803 is connected to each drive circuit that controls the image reading unit 2, the paper feeding unit 3, the plate making unit 4, the printing unit 5, the plate discharging unit 6, and the paper discharge unit 7. The operation / command signals are respectively output via the, and the display / command signals are output to the LED drive circuit and the LCD drive circuit of each display unit that functions as a jam display means of the operation panel 90.

  An operation program called from the ROM 801 by the CPU 800 is temporarily written in the RAM 802 of the control unit 8, and the operation program is rewritten by an input from the operation panel 90. The RAM 802 is a kind of non-volatile memory backed up by a backup battery, whereby various data and the like are configured not to be erased even when a main power switch (not shown) of the stencil printing apparatus 1 is turned off.

The ROM 801 of the control unit 8 stores a plurality of operation programs for operating the actuators of the stencil printing apparatus 1.
A detection signal from each sensor is input to the I / O port 803 of the control unit 8, and the control signal is transmitted from the operation panel 90, the image reading unit 2, the paper feeding unit 3, the plate making unit 4, the printing unit 5, and the plate discharge. Is output to each driving means provided in the unit 6, the paper discharge unit 7 and the like, and controls the operation of the entire stencil printing apparatus.

Here, the control functions of the control unit 8 will be described together with the functional blocks of FIG.
When the control unit 8 detects the winding of the paper on the drum 48 by a winding detection sensor 99 as a winding detection unit, the control unit 8 rotates the drum 48 so as to correct and rotate the drum 48 to an appropriate position P1 where the leading edge of the paper is easily removed from the drum 48. The drum driving means 113 constituting the motor functions as a correction rotating means A1 that rotationally drives the motor driving circuit 112 via the motor driving circuit 112.

Further, the control unit 8 functions as a jam display means A2 for displaying a jam after the drum 48 is rotated to an appropriate position P1 where the paper P is easily removed from the drum by the correction rotation.
Further, the correction rotation means A1 of the control unit 8 has a function of switch rotation control means A1-1 that rotates the drum 48 at a preset low speed only when the manually operated drum rotation switch 110 is pressed.
Further, the correction rotation means A1 of the control unit 8 has a function of a drum rotation speed restriction means A1-2 that controls an extremely low speed equal to or lower than the minimum speed of the normal printing operation as a correction rotation speed.

Further, the correction rotation means A1 of the control unit 8 has a function of correction rotation direction restriction means A1-3 for correcting and rotating the drum 48 in the same direction as when the paper is discharged.
Further, the control unit 8 has a function of a correction rotation restricting means A3 that performs control for prohibiting the correction rotation of the drum 48 other than the specific jam.

Further, the control unit 8 detects that the unit opening / closing detection switch 111 serving as the opening / closing detection unit is turned off and the discharge frame 64 is closed, and then, from the signal of the standby position detection sensor 101 serving as the standby position detection unit, When the drum 48 is not in the standby position (reference position) P2, it has a function of standby position correcting means A4 for performing control to rotate the standby position P2.
Based on the above-described configuration, the operation of the stencil printing apparatus 1 will be described below along the control routines of the roll-up detection process and the drum rotation switch process shown in FIGS.

  After the main switch SWM on the operation panel 90 is turned on, when an operator presses a plate making start key (not shown) after a document to be printed is set in the image reading unit 2, the document transport roller pair 12 rotates and the document is rotated. And the reflection mirror 19 scans the document image. The scanned document image is imaged by the imaging lens 22 and then sent to the image sensor 23. The image sensor 23 that has received the document image information converts this information into an image data signal, and then outputs it to a control means (not shown) that controls the thermal head 43.

  In parallel with the image reading operation in the image reading unit 2, the plate discharging unit 6 performs a plate discharging operation for peeling the used master from the outer peripheral surface of the drum 48. The drum 48 around which the used master is wound on the outer peripheral surface is rotated counterclockwise in FIG. 1 by a drum driving means (not shown). When the drum 48 reaches a predetermined discharge position where the rear end of the used master wound on the outer peripheral surface thereof corresponds to the drive roller 84, the drive rollers 80 and 84 are driven to rotate and the lower discharge plate. The member 62 is moved to the drum 48 side, and the endless belt 86 positioned on the outer peripheral surface of the drive roller 43 comes into contact with the used master wound on the outer peripheral surface of the drum 48. When the endless belt 86 contacts the used master on the drum 48, the drum 48 continues to rotate counterclockwise, and the used master scooped up in contact with the endless belt 45 is the lower discharge plate member 62. And the upper plate removal member 61 and is peeled off from the outer peripheral surface of the drum 48. The peeled used master is conveyed by the lower plate discharging member 62 and the upper plate discharging member 61 and discarded in the plate discharging box 63, and then compressed by a compression plate (not shown). Even after all the used masters are peeled off from the outer peripheral surface of the drum 48, the drum 48 continues to rotate. When the drum 48 reaches the standby position P2 shown in FIG. When the operation is stopped, the opening / closing means (not shown) is operated, the clamper 51 is opened as shown in FIG. 1, and the drum 48 enters the plate feed standby state.

  When the drum 48 is in the plate feed standby state and the plate discharging operation is completed, the plate making operation is subsequently performed. When the clamper 51 is released, the platen roller 42 and each of the master transport roller pairs 45 and 46 are rotationally driven, and the master 41 is pulled out from the master roll 41a. The drawn master 41 is selectively melted by the heating elements of the thermal head 43 based on the image data signal, so that the surface of the thermoplastic resin film is hot-melted and punched to form a plate-making image.

  The master 41 on which the plate-making image is formed is conveyed to the clamper 51 while being guided by a guide plate (not shown). Then, when the control unit 8 recognizes that the tip of the master 41 has been transported to a predetermined position between the clamper 51 and the stage unit 50 based on the number of steps of a stepping motor (not shown) that rotationally drives the platen roller 42, it is not shown. The opening / closing means is actuated to close the clamper 51, and the master 41 is locked on the outer peripheral surface of the drum 48 at the tip.

  When the tip of the master 41 is locked on the outer peripheral surface, the drum 48 starts to rotate again at the same peripheral speed as the master transport speed. Then, from the number of steps of a stepping motor (not shown) that rotationally drives the platen roller 15, the cutting means 44 is operated by the control function of a main routine (not shown) of the control unit 8 to complete the plate making for one plate, and the master 41 Is disconnected. The cut master 41 is pulled out by the rotation of the drum 48, and when the drum 48 reaches a predetermined standby position P2, the operation of the drum driving means (not shown) is stopped and the winding operation is completed.

  Subsequent to the winding operation, a printing operation is performed. After the winding operation is completed, a drum driving unit (not shown) is operated, and the drum 48 is driven to rotate in the clockwise direction in FIG. 1 at a low speed, and the paper feed unit 3 and the paper discharge unit 7 are driven. Only the topmost one of the sheets P stacked on the sheet feed tray 32 is drawn out, and the leading end of the drawn sheet P is added to the registration roller pair 35. The registration roller pair 35 rotates at a predetermined timing and feeds the paper P between the drum 48 and the press roller 58. The fed paper P is pressed against the drum 48 with a predetermined pressing force by a press roller 58 that is swung by a swinging means (not shown). By this pressing operation, the press roller 58 and the outer peripheral surface of the drum 48 are brought into pressure contact with each other via the paper P and the master 41 which has been made, and the ink supplied to the inner surface of the drum 48 by the ink roller 55 is formed in the drum hole 48b, mesh. The image is transferred to the paper P through the screen opening and the master punching portion, and a printed image is formed on the paper P. The paper P to which the ink has been transferred is peeled off from the outer peripheral surface of the drum 48 by the air knife 106 and the peeling claw 88, guided by the guide plate 89, and sent to the paper discharge conveyance member 91. The paper P held on the endless belt 94 by the suction force of the suction fan 95 is conveyed leftward and discharged onto the paper discharge tray 98, and the printing operation is completed. After the printing operation is completed, the drum 48 rotates to the standby position P2 and stops, and the stencil printing apparatus 1 enters a printing standby state.

When the printing start key (not shown) is pressed by the operator after the stencil printing apparatus 1 is in a print standby state, the drum 48 is driven to rotate at a higher speed than at the time of printing, and the paper feed unit 3 and paper discharge unit 7 are also driven. Is rotated, and the paper P is continuously fed from the paper feed unit 3 to perform the printing operation, and reaches step s1 of the roll-up detection routine.
At the time of printing and printing, in this step s1, after the counter (not shown) of the control unit 8 detects the drum standby position (reference position) P2 of the drum 48 in accordance with the pulse signal of the standby position detection sensor 101, Based on that, the detection position P0 is counted and detected.

  Each time the detection position P0 is reached, the paper discharge detection sensor 96 detects the presence or absence of the paper P and the detection light is emitted from the roll-up detection sensor 99 toward the drum 48. When the paper discharge detection sensor 52 detects the paper P and the detection light emitted from the roll-up detection sensor 99 is not reflected, the paper P is peeled off from the drum 48 and the roll-up has occurred. It is considered that there is not, and the control of this time is finished and the process returns to the main routine.

If the paper discharge detection sensor 96 does not detect the paper P and the detection light emitted from the roll-up detection sensor 99 is reflected (see FIG. 2B), the process proceeds to step s3 and the roll-up is performed. Therefore, the printing operation or printing operation is interrupted.
In step s4, if there is an input from the paper feed jam detection sensor 97 and the paper P is not sent to the registration roller pair 35 within a predetermined time, a paper feed error display is operated in step s5. This is performed by the panel 90, and the control of this time is finished and the process returns to the main routine.

When step s6 is reached without input from the paper jam detection sensor 97, the drum driving means 113 is driven via the motor driving circuit 112 by the function of the correction rotation means A1 of the control unit, and the drum is rotated at a predetermined low speed. To the proper position P1. The proper position P1 is detected as the proper position P1 of the drum 48 in accordance with the count of the pulse signal after the latest drum standby position (reference position) P2 is detected. Step s7 waits for the proper position P1 to be detected, and when the drum 48 reaches the proper position P1, step s8 is reached.
Here, the drum 48 is stopped at the appropriate position P1, the roll-up display is performed by the operation panel 90 in step s9, the control of this time is finished, and the process returns to the main routine.

Here, FIG. 4 shows the position of the sheet P when the drum 48 is stopped at the appropriate position P1, and the sheet P that has been rolled up without the separation claw 88 and its stay getting in the way can be removed. And jam handling is easy.
On the other hand, FIG. 3 shows the position of the paper P when the roll-up of the paper P is detected and the printing operation is interrupted (the drum 48 is stopped) in step s3, and is corrected to the proper position P1 as in the present invention. In the case of a conventional stencil printing apparatus that does not have the rotating means A1, the position of the peeling claw 88 and its stay and the front end of the paper P are close to each other, so that the jam handling operation at this position becomes difficult.

After this roll-up detection routine, according to the roll-up display on the operation panel 90, the operator presses the plate release unit opening / closing button 72 as shown in FIG. open.
In this state, that is, as shown in FIG. 11, it is assumed that the plate discharge opening 65 is opened and the drum rotation switch 110 is pressed.
In this case, when the drum rotation switch 110 which is a manual switch is turned on, when the step a1 is reached, if the paper jam detection sensor 97 is turned on to detect the paper jam, the drum rotation switch valid condition is not satisfied. After completing this control, the process returns to the main routine.

When the paper jam detection sensor 97 is off and reaches step a2, the process waits for the drum rotation switch 110 to be turned on, and proceeds to step a3 when it is on.
In step a3, corrective rotation processing is safely performed at an extremely low speed equal to or lower than the minimum speed during normal printing and in the same direction as during normal paper discharge operation of the drum 48. For example, if the drum rotation switch 110 is turned on and the sheet P is pulled out with the left hand, a large force is not required for the jam processing, and the jam processing operation can be easily performed.

  Here, the sheet 48 is wound around the entire circumference of the drum 48, as shown in FIG. 2C, when the sheet P having only the leading edge rolled up is excluded, or as shown in FIG. In such a case, the winding pattern is not constant. Therefore, it is required to move the drum to an appropriate position P1 where the paper discharge operation is most easily performed, and to move the front end of the paper so as to face the discharge plate opening 65. The drum rotation switch 110 can be manually operated to finely adjust the upper end of the rolled up paper P to a position where it can be easily removed. The operator can easily pull out the rolled up paper P from the plate discharge opening 65, Can be eliminated.

After this, the process proceeds to step a5. In step a5, the operator finishes the paper discharge process from the plate discharge opening 65 and waits for the plate discharge opening 65 to be closed. When the unit open / close detection switch 111 is pressed and turned off, the process proceeds to step a6. Here, it is determined whether or not the position of the drum 48 is at the standby position P2, and if not, the process proceeds to step a7.
Here, the drum driving means 113 is rotationally driven via the motor drive circuit 112 so that the position of the drum 48 reaches the standby position P2, and the arrival of the position of the drum 48 at the standby position P2 is detected by a signal from the standby position detection sensor 99. Then, the control of this time is finished and the process returns to the main routine (not shown).

As described above, according to the present invention, when the paper P is rolled up on the drum 48 by the processing of steps s3 to s8, the plate discharging portion 6 located on the paper discharge side of the drum is opened, and the drum 48 is stopped. For example, the rotation position is corrected from the normal standby position P2 and held at the appropriate position P1. For this reason, the drum can be easily corrected and rotated so that the leading edge of the paper P is easily removed from the drum 48, and the leading edge of the paper can be corrected to a position that can be easily understood by the user, thereby facilitating jam processing.
Further, the jam processing can be performed smoothly by performing jam display using the operation panel 90 after the jam processing is enabled by the processing of step s9.

Further, since the drum rotation switch 110 is provided near the paper discharge port m of the vertical long wall 905 on the paper discharge side, which is close to the jam processing position, the operability is improved.
Furthermore, since the drum 48 is corrected and rotated at an extremely low speed when the drum rotation switch 110 is turned on by the processing of steps a2 and a3, the drum 48 can be rotated at the will of the user such as intermittent operation. Can be easily moved to the appropriate position P1, and workability when peeling is improved.
Furthermore, since the drum 48 is corrected and rotated at an extremely low speed equal to or lower than the minimum speed during normal printing by the processing in step a3, safety can be taken into consideration, and the user can perform jam processing with peace of mind.

Further, the drum 48 is rotated and corrected only in the same direction as the paper discharge direction by the processing of step a3, so that the paper P can be easily peeled off from the drum 48.
Further, the processing in step a1 can prevent troubles that may occur secondarily (for example, waste of recovery processing time) by prohibiting unnecessary operations.
Further, by returning the drum 48 to the normal standby position P2 by the processing of steps a6 and a7, the next printing can be performed smoothly.

1 is a schematic front view of a stencil printing apparatus employing an embodiment of the present invention. It is the schematic explaining the drum used for one Example of this invention, (a) is a case where a drum exists in a stand-by position, (b) is a case where it exists in a detection position, (c) is in an appropriate position. (D) shows the case where it exists in another appropriate position. FIG. 2 is a schematic diagram for explaining a case where a sheet is at a position lower than an appropriate position in a state where a stencil discharge opening on the side surface of the stencil printing apparatus of FIG. FIG. 2 is a schematic diagram for explaining a case where a sheet is in an appropriate position in a state where a stencil opening on the side surface of the stencil printing apparatus of FIG. 1 is opened. FIG. 2 is a schematic plan cross-sectional view of a stencil opening on the side surface of the stencil printing apparatus of FIG. 1. FIG. 6 is a side view of the locking member in FIG. 5. FIG. 2 is a configuration block diagram of a control unit of the stencil printing apparatus of FIG. 1. It is a functional block diagram of the control part of the stencil printing apparatus of FIG. FIG. 2 is a first perspective view of the stencil printing apparatus of FIG. 1. FIG. 3 is a second perspective view of the stencil printing apparatus of FIG. 1. FIG. 2 is a perspective view of the stencil printing apparatus of FIG. FIGS. 2A and 2B are diagrams illustrating a procedure for opening a stencil of the stencil printing apparatus of FIG. 1, in which FIG. 1A is a pressing unit opening / closing button pressing state, FIG. c) shows a perspective view from the other side when the rolled-up paper is removed from the plate discharge opening. 2 is a flowchart of a winding detection processing routine performed by a control unit of the stencil printing apparatus of FIG. 2 is a flowchart of a drum rotation switch processing routine performed by a control unit of the stencil printing apparatus of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stencil printing apparatus 2 Image reading part 3 Paper feed part 4 Plate making part 5 Printing part 6 Plate discharging part 7 Paper discharge part 8 Control part 41 Master 48 Drum (plate cylinder)
68 Unit opening / closing means 96 Paper discharge detection sensor 99 Winding detection switch 101 Standby position detection sensor 102 Drum rotation position detection sensor (rotation position detection means)
110 Drum rotation switch 111 Unit open / close switch (open / close detection means)
113 Drum driving means (rotating means)
A1 Correction rotation means A2 Jam display means A3 Correction rotation restriction means A4 Standby position correction rotation means P Paper P0 Detection position P1 Appropriate position P2 Standby position

Claims (8)

  Opening / closing means for a unit located on the paper discharge side of the drum disposed in the housing, opening / closing detection means for detecting opening / closing of the opening / closing means, rotating means for rotating the drum, and rotation for detecting the rotation position Position detection means, roll-up detection means for detecting that the paper has been rolled up on the drum, jam display means for notifying that the paper has been rolled up, and leading edge of the paper when the occurrence of the roll-up is detected A stencil printing apparatus comprising control means for correcting and rotating the drum to an appropriate position where it can be easily removed from the drum.   2. The stencil printing apparatus according to claim 1, wherein the drum is displayed by a jam display means after the drum is rotated to an appropriate position where the paper is easily removed from the drum by correction rotation.   The stencil printing apparatus according to claim 1 or 2, further comprising a switch capable of manually operating the correction rotation of the drum, wherein the switch is disposed in the vicinity of the paper discharge side.   4. A stencil printing apparatus according to claim 3, wherein said control means correctively rotates said drum only while the manual switch is pressed.   5. The stencil printing apparatus according to claim 1, wherein the correction rotation is performed at a speed equal to or lower than a minimum speed of a normal printing operation. 6.   6. The stencil printing apparatus according to claim 1, wherein the control unit correctively rotates the drum in the same direction as when the paper is discharged.   7. The stencil printing apparatus according to claim 1, wherein the control unit prohibits correction rotation of the drum other than a specific jam. 2. The stencil printing apparatus according to claim 1, further comprising standby position detecting means for detecting a standby position of the drum, wherein the control means detects that the unit has been closed by the open / close detection means, and then the drum. When the stencil is not in the standby position, it is rotated to the standby position.

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