JPH1134468A - Stencil printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve usability of a stencil printer by performing all of double- side simultaneous printing, one-side printing and one-step multicolor printing by one printer. SOLUTION: A clamping mechanism for holding a printing sheet S is provided at a transfer cylinder 700 surrounded at is periphery by a first plate cylinder 201, second plate cylinder 601 and third plate cylinder 1101. And, a clamp opening/closing member for opening and closing the clamping mechanism in response to a printing mode is provided near the cylinder 700. The ember comprises a holding movable cam 710 for holding the sheet S from a first sheet feeder 300 and selectively taking a clamping position and a non-clamping position, an opening movable cam 715 for selectively taking an opening position and non-opening position, an opening fixing cam 720 and a holding fixed cam 730 for holding the sheet S from a second sheet feeder 1300.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine (hereinafter referred to as a "master") formed by perforation and stencil winding on an outer peripheral surface of a porous cylindrical plate cylinder, and ink is leached from a perforated portion of the master. The present invention relates to a stencil printing apparatus that transfers a printed image by transferring the ink to printing paper.

[0002]

2. Description of the Related Art Conventionally, digital thermosensitive stencil printing has been known as a simple printing method. This is because, after a master melt-punched by a thermal head or the like based on read information of a document image is wound around the outer peripheral surface of a porous cylindrical plate cylinder, ink is supplied by an ink supply mechanism arranged inside the plate cylinder. And transfers the printed image by exuding the ink from the perforated portion of the master and transferring it to printing paper. In recent years, in stencil printing, double-sided printing in which printing is performed on both sides of a printing paper has been increasing in order to save printing paper and prevent an increase in files. This double-sided printing is obtained by turning over the printed paper once and feeding it again,
There is a problem that the procedure for re-feeding the printing paper is troublesome. In addition, the printed matter after the printing is completed, the ink is not sufficiently dried, so if it is desired to immediately print on the back side, the transport rollers and press rollers in the paper feed path are pressed against the insufficiently dried image area, The printed image is dirty or unclear. For this reason, in most cases,
The printing on the back side has been performed several hours or more after the printing on the front side of the printing paper has been completed. In particular, when there is a so-called solid image portion having a large amount of ink, it is necessary to dry the ink for a long time, so that printing on the back surface has been performed the next day.

As described above, in duplex printing, it is necessary to wait for a long time until printing on the back side, and since the paper is fed twice, the net printing time requires twice as long as that in single-sided printing. And it takes too much time.

[0004] As a solution to the time problem of double-sided printing, for example, a stencil printing apparatus described in JP-A-6-71996 or JP-A-8-118774 is known. The stencil printing apparatus described in JP-A-6-71996 has an ink roller 2000 inside as shown in FIG.
The plate cylinders 2003 and 2004 having a clamper 2001 for holding the master on the outer peripheral surface are arranged so as to face each other. The plate cylinder 2004 is freely movable toward and away from the plate cylinder 2003, and the plate cylinder 2004 presses the plate cylinder 2003 with the plate-making masters corresponding to the front and back surfaces of the printing paper 2005 wound around each plate cylinder. Then, printing is performed on both sides of the printing paper 2005 at the same time. The printed printing paper 2005a is discharged to the paper discharge unit 2006. If an unprinted master is wound around one of the plate cylinders to perform the same operation as double-sided printing, single-sided printing can be performed.

As shown in FIG. 19, a stencil printing apparatus described in Japanese Patent Application Laid-Open No. 8-118774 has plate cylinders 2003 and 20.
The transfer cylinder 2007 is provided between the transfer cylinders 04 and the plate cylinders 2003 and 2004 are provided so as to be able to freely contact and separate from the transfer cylinder 2007. The ink image of the plate cylinder 2003 is transferred to the transfer cylinder 2007, and thereafter, the plate cylinder 2004
And a transfer cylinder 2007 for simultaneous double-sided printing. In the stencil printing apparatus described in Japanese Patent Application Laid-Open No. 6-71996, when performing continuous printing, the back side image of the printing paper on which the ink has not yet dried sufficiently overlaps the uppermost surface of the discharged printing paper. Although there is a problem that image stains occur, according to the indirect transfer method using the transfer cylinder 2007, an ink drying step can be secured, and thus there is an advantage that the above-described image stain problem can be solved. Also, in the case of the stencil printing apparatus described in JP-A-8-118774, single-sided printing can be performed by performing the same operation with the plate cylinder 2004 without transferring an ink image to the transfer cylinder 2007. Becomes

Conventionally, when printing not only a single color but also multicolor printing on one sheet of printing paper, such as when printing a flyer or the like, a plurality of color cylinders are prepared.
After printing the first color, the ink is sufficiently dried, and then the multi-color printing is performed by replacing the plate cylinder and refeeding the ink. For this reason, there is a problem that it takes too much time in the case of multi-color printing as in the case of double-sided printing.

As a solution to the time problem in multicolor printing, for example, a multicolor printing apparatus described in JP-A-4-329175 is known. As shown in FIG. 20, a plurality of plate cylinders 2010 and 2011 having different colors are arranged around a printing plate cylinder 2009 provided with a clamper 2008 that clamps the leading end of the printing paper 1005 on the outer peripheral surface. Are provided so as to be able to freely contact and separate from the printing plate cylinder 2009.
By continuously contacting and separating the plate cylinders 2010 and 2011 during one rotation of the printing plate cylinder 2009 around which the printing paper 2005 is wound, a multicolor print can be obtained in one step.

[0008]

Incidentally, in the above three prior arts, the forms of printing that can be performed without re-feeding, that is, without time, are as shown in Table 1.

[0009]

[Table 1]

[0010] In recent years, there has been an increasing need by users for one-sided printing, two-sided simultaneous printing, and one-step multi-color printing with one device. There is no printer that enables all of these print modes, and it has not been possible to sufficiently meet user needs. That is, in the stencil printing apparatuses described in JP-A-6-71996 and JP-A-8-118774, when performing multi-color printing, the printing paper once discharged must be dried and re-fed as usual. Must also
In the stencil printing apparatus described in Japanese Patent Application Laid-Open No. 4-329175, when performing double-sided printing, conventionally, once discharged printing paper had to be inverted after drying, and then re-fed.

Accordingly, an object of the present invention is to provide a stencil printing apparatus which enables all printing modes of single-sided printing, double-sided simultaneous printing, and one-step multicolor printing with the same configuration.

[0012]

SUMMARY OF THE INVENTION The present invention provides a transfer cylinder having a function of clamping printing paper on a transfer cylinder by fusing the concept of a printing cylinder in multi-color printing with a transfer cylinder which has conventionally existed individually.
It is another object of the present invention to open and close the clamp mechanism of the transfer cylinder, whose necessity changes according to the print mode, at a low cost by a simple mechanical configuration without complicated electric control. It is another object of the present invention to realize various printing modes with one apparatus by arbitrarily opening and closing a clamp mechanism of a transfer cylinder and using a plurality of paper feed paths. Specifically, according to the first aspect of the invention, after the stencil printing paper is wound around the plate cylinder, ink is exuded from the perforated portion of the stencil printing paper, and the ink is supplied from the paper feeding unit. In a stencil printing apparatus that transfers a print image by transferring the printing paper to a printing paper and discharges the printing paper to a paper discharge unit, a plurality of plate cylinders and a plurality of plate cylinders are arranged at positions facing the plurality of plate cylinders, respectively. A transfer cylinder having a clamp mechanism that rotates at the same peripheral speed as the cylinder and clamps the leading end of the printing paper in the supply direction, and a plurality of paper feed units; A configuration is provided in which a clamp opening / closing member is provided so as to be able to freely contact and separate from the transfer cylinder and is configured to open and close the clamp mechanism in accordance with a printing mode in the vicinity of the transfer cylinder.

According to a second aspect of the present invention, in the configuration of the first aspect, the clamp opening / closing member opens and closes the clamp mechanism in accordance with a printing mode as the transfer cylinder rotates. .

According to the third aspect of the present invention, the first or second aspect is provided.
In the configuration described above, the plate cylinder is provided around the transfer cylinder by three.
More than one is provided.

According to a fourth aspect of the present invention, in the configuration of the first, second or third aspect, the clamp opening / closing member comprises two types of cams, a movable cam and a fixed cam, and displaces the movable cam appropriately. Accordingly, a configuration is adopted in which various print modes are supported.

According to a fifth aspect of the present invention, in the configuration according to the first, second or third aspect, the clamp opening / closing member is provided at a position corresponding to one sheet feeding unit, and a sheet feeding timing from the sheet feeding unit is provided. And a movable cam for holding, which can selectively take a position where the printing paper is held by the clamp mechanism and a position where the printing paper is not held, and a sheet feeding unit provided at a position corresponding to another sheet feeding unit. It is possible to selectively take a holding cam for holding the printing paper by the clamp mechanism with respect to the timing, and a position provided at a position corresponding to one sheet discharging section to open and not to open the clamp mechanism. The configuration is such that it comprises an opening movable cam and an opening fixed cam which is provided at a position corresponding to another sheet discharging section and always opens the clamp mechanism.

According to a sixth aspect of the present invention, in the configuration of the fifth aspect, a driving member corresponding to each of the nipping movable cam and the opening movable cam is provided, and each driving member is set to a print mode. The configuration is such that control means for controlling according to the input is provided.

In the invention according to claim 7, claims 1, 2,
In the configuration described in 3, 4, 5, or 6, the single-color or multicolor printing on the front and back surfaces of the printing paper is switched by switching the paper feeding path of the printing paper.

According to the eighth aspect of the present invention, there is provided the first, second, third and fourth aspects.
In the configuration described in 3, 4, 5, or 6, paper can be fed from a plurality of paper feed units in one print mode, and after feeding from one paper feed unit, switching to another paper feed unit is performed. The printing paper is supplied continuously.

According to the ninth aspect of the present invention, the first, second, and third aspects of the present invention are provided.
In the configuration described in 3, 4, 5, or 6, a configuration is adopted in which a plurality of plate cylinders can be fed from a plurality of feeding units, and the printing paper is continuously supplied as a whole apparatus. .

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram illustrating the overall configuration of a stencil printing apparatus according to the present embodiment. In FIG. 1, a stencil printing machine 1
Are roughly divided into a first plate making section 100 and a first printing section 20.
0, first paper supply unit 300, first paper discharge unit 400, second plate making unit 500 and second printing unit 600, transfer cylinder 700, second paper discharge unit 900, third plate making unit 1000 and third printing unit 110
0 and a second sheet feeding unit 1300.

The first plate making section 100 is provided with a master 101. The master 101 has a laminate structure in which a thin paper of about 1 to 2 μm is attached with Japanese paper or synthetic fiber serving as a porous support, or a mixture of both materials. I have. The master 101 is wound around a core material 101A in a roll shape and can be sequentially fed out.
The master 101 pulled out from the roll state is pressed against the thermal head 102 by the platen roller 103, and is perforated in the main scanning direction and the sub-scanning direction by the selective heat generation of the heating element of the thermal head 102. In this case, the main scanning direction corresponds to the axial direction of the platen roller 103, and the sub-scanning direction corresponds to a direction perpendicular to the main scanning direction. For this reason, the platen roller 103 can rotate not only to simply press the master 101 toward the thermal head 102 but also to extend the master 101 in the sub-scanning direction. The master 101 that has completed the perforating process, that is, the plate making, is cut into a required length by the cutter 104 and is conveyed toward the first plate cylinder 201 via the guide member 105.

The first printing section 200 has a porous cylindrical first printing section 200.
And an ink supply mechanism 202 disposed inside the first plate cylinder 201 as a main part thereof. The first plate cylinder 201 is rotatable around the rotation axis 201A in the direction of the arrow shown in the figure, and a large number of perforations are formed on its peripheral surface except for a part. Although not shown, a thin mesh screen made of synthetic fibers is attached to the surface. Metal can be used as a material for the mesh screen. First
A stage 203 made of a magnetic material on which the tip of the master 101 is mounted, and a stage 203 that is freely movable toward and away from the stage 203, is provided on a portion of the peripheral surface of the plate cylinder 201 where no perforation is made. Is provided. With this configuration, the master 101 is nipped and fixed by the clamper 204 in a state where the master 101 has its tip mounted on the stage 203.

The ink supply mechanism 202 includes an ink roller 2
05 and a doctor roller 206. The ink roller 205 is disposed below the rotation axis 201A of the first plate cylinder 201 and opposed to a transfer cylinder 700 described later, and serves as a metal roller that rotates in the direction of the arrow shown in the figure. The ink roller 205 contacts the inner peripheral surface of the first plate cylinder 201 while
The ink rotated at a peripheral speed slightly lower than the peripheral speed of
To the plate cylinder 201 and the perforated portion of the mesh screen. The ink whose amount is regulated by the doctor roller 206 is dropped from an ejection port formed on the rotating shaft 201A into the ink reservoir 207. In addition, since the ink roller 205 is disposed at a position facing the transfer cylinder 700, the ink roller 205 also functions as a backup roller that prevents deformation when the first plate cylinder 201 comes into contact with the transfer cylinder 700 during printing. It has become.

The first plate cylinder 201 is provided so as to be able to advance and retreat with respect to the transport path of the printing paper S by the advance and retreat mechanism shown in FIG. The advance / retreat mechanism includes a plate cylinder moving arm 214. The plate cylinder moving arm 214 can swing between a position at which the printing paper S advances into the conveyance path with the support shaft 214A supported by an immovable portion of the printing apparatus main body as a fulcrum and a position at which the printing paper S retreats from the conveyance path. Arm stopper 207 which is located at the tip on the swinging side when in the retracted position.
To be locked. Arm stopper 207
Is a swingable arm, which can be engaged and disengaged from the tip of the plate cylinder moving arm 214 on the swing side by a solenoid 208 having an actuator 208A connected near the swing end. The actuator 208A of the solenoid 208 is always protruded by the return spring 209.
Reference numeral 07 is always engageable with the tip of the plate cylinder moving arm 214 on the swing side. When the solenoid 208 is operated by a signal from a print paper detection sensor P disposed on the upstream side of the first plate cylinder 201 in the transport direction of the print paper S fed from the paper supply unit 300, the arm stopper 207
The engagement between the plate cylinder moving arm 214 and the leading end on the swing side is released.

A rotating shaft 201A of the first plate cylinder 201 is supported at a part of the swinging end of the plate cylinder moving arm 214. Between the rotating shaft 201A and the swing-side tip,
A cam follower 210 rotatably supported by a shaft 210A supported by the plate cylinder moving arm 214 is provided. The cam follower 210 faces a plate cylinder moving cam 211 constituted by an eccentric cam rotatably provided at an immobile portion of the printing apparatus main body. Plate cylinder moving cam 2
11, the first plate cylinder 201 advances to the conveying path of the printing paper S when the small diameter portion faces the cam follower 210, and the first plate cylinder 2 when the large diameter portion faces the cam follower 210.
01 is retracted from the transport path of the printing paper S, and the swinging end of the plate cylinder moving arm 214 is
7 is formed in such a shape that it can be engaged. In FIG. 2, reference numeral 212 denotes a tension spring for applying an urging force to swing the plate cylinder moving arm 214 in a direction in which the cam follower 210 of the plate cylinder moving arm 214 comes into contact with the plate cylinder moving cam 211. I have.

The following operation is performed by the above-mentioned advance / retreat mechanism. First, when the first plate cylinder 201 is set at a position retracted from the conveyance path of the printing paper S, the plate cylinder moving cam 2
When the large-diameter portion 11 faces the cam follower 210, the tip of the plate cylinder moving arm 214 on the swing side engages with the arm stopper 207. Thus, the first plate cylinder 201 is held at a position retracted from the conveyance path of the printing paper S against the urging force of the tension spring 212 hung on the plate cylinder moving arm 214. Next, when the first plate cylinder 201 is advanced to the transport path of the printing paper S, the solenoid 208 causes the arm stopper 207 to move the arm stopper 207 against the biasing force of the return spring 209 so that the leading end of the plate cylinder moving arm 214 swings. And release the locked state. The plate cylinder moving arm 214 includes a tension spring 212
Of the plate cylinder moving cam 21 by the urging force of
It swings in the direction to move toward 1. Plate cylinder moving cam 211
The cam follower 210 faces the small diameter portion of
The plate cylinder moving arm 214 moves the first plate cylinder 201 to the printing paper S
To the transport path.

The first sheet feeding section 300 includes a registration roller 301 for setting a timing (sheet feeding timing) for feeding the printing sheet S. This registration roller 301
Holds the leading end of the printing paper S conveyed from a paper cassette (not shown), and holds the master 10 on the first plate cylinder 201.
1 is provided to align the leading end of the image with the transfer position of the printing paper S. The fed printing paper S is
The paper is fed toward a position facing the ink roller 205 by the guide member 302.

The first paper discharge unit 400 includes a transport unit 400A.
And a paper discharge tray 400B. Conveying means 40
Reference numeral 0A denotes a peeling claw 401A that peels off the printing paper S on which an image corresponding to the master 101 has been transferred, and a suction conveyance device 402.
A is provided. The peeling claw 401A is attached to the first plate cylinder 201.
Is a oscillating member that is disposed at a position corresponding to after the image is printed on the printing paper S in the rotation direction of the printing paper S and forms a peeling portion of the printing paper S. Can be selectively swung to a position between the front end of the first plate cylinder and the first plate cylinder 201. Although not shown, it is also possible to provide a structure in which air is blown to the printing surface of the printing paper S whose tip is separated from the surface of the plate cylinder by the peeling claw 401A to assist the peeling of the printing paper S. The suction conveyance device 402A is provided with the first plate cylinder 201.
The suction box 404A connected to a suction fan (not shown) is provided to convey the printing paper S peeled from the paper tray while sucking and holding it toward the discharge tray 400B.
And a transport belt 405A. The suction box 404A is separated from the first plate cylinder 201 by the peeling claw 401A.
It is provided to suck the printing paper S peeled off from the conveyor belt 405A. The transport belt 405A is
A plurality of the pulleys 406A and 407A are extended along the axial direction, and one of the pulleys 406A and 407A can be moved in a direction indicated by an arrow in FIG.

Next, the second plate making section 500 and the third plate making section 1
000, the second printing unit 600 will be described. The second plate making section 500 and the second printing section 600 are provided with a transfer cylinder 70 described later.
0, the first plate cylinder 201 in the first printing unit 200
Is provided at a position opposite to the above. The second plate making section 500 and the third plate making section 1000 have the same configuration as the first plate making section 100, and for convenience, the first digit of the reference numerals used in the description of the first plate making section 100 is applied as it is. The detailed description is omitted. The second printing unit 600 includes the first printing unit 2
00, the second plate cylinder 601 and the ink supply mechanism 60
2 as the main part. Like the first plate cylinder 201, the second plate cylinder 601 is rotatable about the rotation axis 601A in the direction of the arrow shown in the drawing, and a large number of perforations are formed on its peripheral surface except for a part. Have been. And on the surface,
Although not shown, a thin mesh screen made of synthetic fibers is attached. Metal can be used as a material for the mesh screen. In a portion of the peripheral surface of the second plate cylinder 601 where no perforation has been made,
A stage 603 made of a magnetic material on which the tip of the master 501 is placed, and a clamper 604 that is freely movable toward and away from the stage 603 and has a magnet are provided. With this configuration, the master 501 is nipped and fixed by the clamper 604 with its tip placed on the stage 603.

The ink supply mechanism 602 includes an ink roller 6
05, the doctor roller 606 and the ink supply pipe 6
07 mainly. The ink roller 605 is
A metal roller that is located above the rotation axis 601A of the second plate cylinder 601 and rotates in the direction of the arrow shown in the figure. The metal roller contacts the inner peripheral surface of the second plate cylinder 601 and contacts the second plate cylinder 601. The ink is rotated at a peripheral speed slightly lower than the peripheral speed, and the amount of ink specified by the doctor roller 606 is supplied to the second plate cylinder 601 and the perforated portion of the mesh screen. Further, the ink roller 605 is disposed at a position facing the transfer cylinder 700, and the second plate cylinder 6
01 also functions as a backup roller for preventing deformation when it comes into contact with the transfer cylinder 700 during printing. In the case of the present embodiment, the ink supply pipe 607 supplies ink from the inside of the hollow pipe which also serves as the rotation shaft 601A of the second plate cylinder 601 to the ink reservoir 608 located above the rotation shaft 601A. It is supposed to. The ink pool 608 corresponds to a wedge-shaped space formed by the ink roller 605 and the doctor roller 606. For this reason, the ink supply pipe 607 extends from the rotation shaft 601A of the second plate cylinder 601, and its end is open toward the ink reservoir 608.

The second plate cylinder 601 can be moved toward and away from the transfer cylinder 700 by an advancing and retreating mechanism similar to that shown in FIG. 2 in that the fulcrum position of the plate cylinder moving arm 214 is changed to a position where the swing direction in which the plate cylinder moving arm 214 can perform a seesaw motion is set. However, since the functions are completely the same, the reference numerals shown in FIG. 2 are used as they are, and detailed description thereof is omitted.

The second sheet discharging section 900 includes a conveying means 900A,
910A, a paper discharge tray 900B, and a guide plate 920. The transport unit 900A includes a peeling claw 901 that peels the printing paper S on which the image corresponding to the master 501 has been transferred.
A and a suction conveyance device 902A. Peeling nail 90
Reference numeral 1A denotes a swinging member which is disposed at a position corresponding to a position after printing the image on the printing paper S in the rotation direction of the second printing drum 601 and forms a peeling portion of the printing paper S, and a surface of the second printing drum 601. From the printing paper S and a position between the leading end of the printing paper S and the second plate cylinder 601. Although not shown, it is also possible to provide a configuration in which air is blown to the printing surface of the printing paper S whose tip is separated from the surface of the plate cylinder by the peeling claw 901A to assist the peeling of the printing paper S.

The suction transfer device 902A is connected to the second plate cylinder 60
The suction box 904A is provided for transporting the printing paper S peeled from the sheet No. 1 while sucking and holding it toward the guide plate 920, and connected to a suction fan (not shown).
And a transport belt 905A. The suction box 904A is moved by the peeling claw 901A to the second plate cylinder 601A.
It is provided to suck the printing paper S peeled off from the conveyor belt 905A. The transport belt 905A is
A plurality of pulleys are stretched along the axial direction of the pair of pulleys 906A and 907A, and one of the pulleys 906A and 907A can be moved in the direction of the arrow in FIG.

The guide plate 920 is provided to guide the printing paper S transported by the transporting means 900A to the transporting means 910A while changing its transport direction. The transfer means 910A includes a suction transfer device 912A. The suction conveyance device 912A is provided to convey the printing paper S conveyed from the guide plate 920 in a state of being suction-held toward the discharge tray 900B, and includes a suction box 914A connected to a suction fan (not shown). , Conveyor belt 9
15A. A plurality of the conveyor belts 915A are wound around the pair of pulleys 916A and 917A in the axial direction, and one of the pulleys 916A and 917A can be moved in a direction indicated by an arrow in FIG.

As shown in FIG. 1, a transfer cylinder 700 is disposed between the first plate cylinder 201 and the second plate cylinder 601, and further, the first plate cylinder 201 and the second plate cylinder 601 are arranged. In addition, a third plate cylinder 1101 described below is arranged so as to surround the periphery of the transfer cylinder 700, and three plate cylinders are arranged around the transfer cylinder 700 (claim 3). Transfer cylinder 70
Numeral 0 is designed to be rotatable in the direction of the arrow at the same peripheral speed as the first plate cylinder 201, the second plate cylinder 601 and the third plate cylinder 1101. As is apparent from FIG. 4, the transfer cylinder 700 has a concave portion 700D into which the clamper 204 of the first plate cylinder 201, the clamper 604 of the second plate cylinder 601 and the clamper 1104 of the third plate cylinder 1101 can enter. It is a drum member formed on a part of the peripheral surface, and includes a clamp mechanism 700C for holding the leading end of the printing paper S in the supply direction. An elastic member made of synthetic rubber is attached to the peripheral surface other than the concave portion 700D so that the ink can be transferred to the surface.

As shown in FIG. 3, the clamp mechanism 700C includes a magnet plate 705 as a stage on which the leading end of the printing paper S is placed, and the printing paper S between the magnet plate 705.
A clamper 706 made of a magnetic material sandwiching the tip of the transfer cylinder 700, a clamper shaft 707 for rotatably supporting the clamper 706 with respect to the transfer cylinder 700, and one end of a clamper shaft 707 protruding outward from the side surface of the transfer cylinder 700. A roller 708 as a contact rotatably provided and a clamper shaft 70 at one end.
7, and the other end thereof is locked at an appropriate position of the transfer cylinder 700, and the spring 709 urges the clamper 706 to be always closed.

The housing 1B in the vicinity of the transfer cylinder 700 is provided with a clamp opening / closing member for opening and closing the clamp mechanism 700C according to the printing mode as the transfer cylinder 700 rotates. ). This clamp opening / closing member is composed of two types of cams, a movable cam and a fixed cam. More specifically, the nipping movable cam 710 provided at a position corresponding to the first paper supply unit 300, the nipping fixed cam 730 provided at a position corresponding to the second paper supply unit 1300, and the transfer cylinder 700 The opening fixed cam 720 provided corresponding to the second paper discharge unit 900 at a position substantially opposed to the holding movable cam 710 in the radial direction of the transfer drum 700, and substantially opposed to the holding fixed cam 730 in the radial direction of the transfer cylinder 700. The first discharge unit 40
0 and a movable cam for opening 715 provided corresponding to 0 (claim 5). These cams are the transfer cylinder 70
It is provided so as to be located on the trajectory of the roller 708 accompanying the zero rotation.

The holding movable cam 710 has an elongated hole 71 extending vertically and penetrating in the axial direction of the transfer cylinder 700.
Two shafts 0a are formed at intervals in the horizontal direction, and a support shaft 711 fixed to the housing portion 1B is inserted into the elongated hole 710a to be supported so as to be movable in the vertical direction. Similarly, the opening movable cam 715 is formed with two elongated holes 715a extending in the vertical direction and penetrating in the axial direction of the transfer cylinder 700 at intervals in the horizontal direction. Is supported by the shaft 712 fixed thereto to be movable in the vertical direction. Movable cam 710 for holding
And the lower ends of the opening movable cams 715 are respectively connected to the housing unit 1.
B is fixed to the movable iron core 713a of each solenoid 713 as a driving member fixed to B.
With the operation described above, two positions, that is, an upper position and a lower position are selectively taken. Each solenoid 71
Reference numeral 3 is driven by a main control unit of the stencil printing apparatus 1 as control means (not shown) according to an input of a print mode.

The upper position of the nipping movable cam 710 is a position (hereinafter, referred to as a clamp position) at which the print sheet S is nipped by the clamp mechanism 700C with respect to the sheet feeding timing from the first sheet feeding unit 300, and the lower position. Is a position where no clamping is performed (hereinafter referred to as a non-clamp position). On the other hand, the upper position of the opening movable cam 715 is a position at which the clamp mechanism 700C is opened (hereinafter, referred to as an open position), and the lower position is a position at which the clamp mechanism 700C is not opened (hereinafter, referred to as a non-open position). The fixing cam for opening 720 is fixed at a position where the leading end of the printing paper S sandwiched by the clamp mechanism 700C is opened toward the second sheet discharging unit 900. The printing paper S fed from the paper unit 1300 is fixed at a position where the leading end of the printing paper S can be clamped.

As shown in FIG.
On the upper surface of the drawing, from the right side in the drawing, an initial guide surface 710b for smoothly moving the roller 708, a convex surface 710c for opening the clamp mechanism 700C, and a concave surface 710d for closing the clamp mechanism 700C are continuously and continuously formed. It is formed gently. From convex surface 710c to concave surface 710d
Are gently continued, so that the abrupt closing operation of the clamper 706 is avoided, and damage to the printing paper S due to the nipping operation is prevented. The movable cam 715 for opening also has a concave surface 715b and a convex surface 7 for opening the clamp mechanism 700C.
15c are formed continuously and gently. Also,
A concave surface 720a and a convex surface 720b for releasing the clamp mechanism 700C are continuously and gently formed on the opening fixed cam 720. Concave surface 715a or concave surface 720a
Is an initial guide surface 710c of the movable cam 710 for clamping.
And a smooth opening operation of the clamper 706 is obtained. In addition, the fixed cam 73 for holding
730a, 730b, 730c at 0
It corresponds to the initial guide surface 710b, the convex surface 710c for opening the clamp mechanism 700C, and the concave surface 710d for closing the clamp mechanism 700C in the movable cam 710 for clamping.
A similar function is provided for the clamp mechanism 700C.

When the nipping movable cam 710 is at the clamp position shown in FIGS. 4 and 5, the timing at which the printing paper S is fed out from the first paper feeding unit 300 by the registration rollers 301 and the roller 708 is moved to the convex surface 710c The timing with which the clamper 706 is opened when the vehicle runs up is synchronized (FIG. 5), and subsequently the roller 708 reaches the concave surface 710d and the clamper 706 closes (FIG. 4), so that the leading end of the printing paper S can be clamped. . Movable cam 710 for holding
Is in the non-clamp position shown in FIG.
08 does not come into contact with the nipping movable cam 710, the clamper 706 does not open, and the printing paper S is not nipped even if the printing paper S is fed out from the first paper feeding unit 300.

On the other hand, when the opening movable cam 715 is in the non-open position shown in FIG.
Are not opened, and the held printing paper S is not released. When the opening movable cam 715 is in the opening position shown in FIG.
The roller 708 rides on 15c, and the clamper 706 is separated from the magnet plate 705 and opened. Therefore, when the printing paper S is nipped, the leading end of the printing paper S is opened toward the first paper output unit 400. You.

As shown in FIG. 7, the opening movable cam 715
Is in the non-open position, the rotation of the transfer cylinder 700 advances, and the clamp mechanism 700C
When the roller 708 reaches the convex surface 7 of the opening fixed cam 720,
When the print paper S is nipped, the leading end of the print paper S is opened toward the second paper discharge unit 900 because the clamper 706 is pulled apart from the magnet plate 705 and opened.

When paper is fed from the second paper feed unit 1300, as shown in FIGS.
10 is moved to the unclamped position. Second paper feed unit 130
0, the timing at which the printing paper S is fed out by the registration roller 1301 is synchronized with the timing at which the roller 708 rides on the convex surface 730b of the holding fixed cam 730 to open the clamper 706 (FIG. 9).
8 reaches the concave surface 730c and the clamper 706 closes (FIG. 8), so that the leading end of the printing paper S can be held. Since the opening fixed cam 720 and the holding fixed cam 730 are cams fixed at fixed positions, the clamping mechanism 70
When 0C passes through these, the clamper 706 is always opened and closed regardless of the type of print mode.

As shown in FIG. 1, in the vicinity of the transfer cylinder 700, a cleaning roller 701 that can come into contact with and separate from the surface of the transfer cylinder 700 is disposed.
A part is immersed in a cleaner 704 stored in a cleaner tank 702 and is in contact with a rotatable cleaner supply roller 703. The cleaner is used to remove ink remaining on the peripheral surface of the transfer cylinder 700.

The third printing unit 1100 includes a second printing unit 600
For convenience, the first digit of the reference numerals used in the description of the second printing unit 600 is applied as it is, and a detailed description thereof will be omitted. The third plate cylinder 1101 is moved by the same reciprocating mechanism as the structure of the second plate cylinder 601 to transfer the transfer cylinder 7.
It is provided so as to be able to freely contact and separate from 00. This advancing / retracting mechanism is different from the configuration of the second plate cylinder 601 in that it is changed to a symmetrical position. However, since it is completely the same in function, the reference numerals shown in FIG. Description is omitted. The second paper feeding unit 1300 includes a registration roller 301 for setting the timing of feeding the printing paper S, a transport roller 1304 for transporting the printing paper S from a paper cassette (not shown) to the registration roller 301, and guide members 1302 and 1303. It has. Registration roller 1
Numeral 301 is provided for locking the leading end of the printing paper S conveyed from a paper cassette (not shown) and aligning the transfer position of the printing paper S with the leading end of the image of the master 1101 on the third printing unit 1100. ing. The fed printing paper S is fed to the ink roller 110 by the guide member 1302.
5, and is fed to a position opposite to.

As will be described in detail later, in the embodiment according to the present invention, since single-color and multi-color printing can be simultaneously performed on the front and back surfaces of the printing paper S, the printing start positions between the images and between the colors are matched. It is necessary to prevent the image quality from being degraded by preventing the image quality from being degraded. Therefore, in this example, a top-bottom moving mechanism for adjusting the phase of the printing start position for the printing paper S to the same position on both the upper and lower sides of the printing paper S is provided. As shown in FIG. 10, the vertical moving mechanism includes a first plate cylinder 201,
It is constituted by a planetary gear mechanism having a group of gears for driving the rotation of the transfer cylinder 700 and the second plate cylinder 601. The planetary gear group includes a first plate cylinder 201 and a transfer cylinder 70.
0, and between the second plate cylinder 601 and the transfer cylinder 700. However, since all the gear groups have the same configuration, in FIG. Only the gear group between the body 700 and the gear 700 will be described.

The second plate cylinder gear 601B and the transfer cylinder gear 700B are integrally provided on the rotating shafts 601A and 700A of the second plate cylinder 601 and the transfer cylinder 700, respectively. Of these gears, the transfer cylinder gear 700B meshes with a drive gear 800 fixed to the output shaft of the drive motor M1, and the second plate cylinder gear 601B and the transfer cylinder gear 700B have idle gears 801a, 801b are engaged with each other.

Since the transfer cylinder 700 does not have an advance / retreat mechanism as provided in the second plate cylinder 601 and is merely rotatably supported by an immovable portion of the printing apparatus main body, the drive gear 800 is always driven. It is designed to be able to mesh.

The idle gears 801a and 801b are
Of the plate cylinder 601 and transfer cylinder 700
00A, a connecting arm 802a whose one end is pivotally supported.
802b is supported by the other end. The shaft support portions of the idle gears 801a and 801b are connected by a connection link 803. As a result, the idle gears 801a and 801b can roll around the plate cylinder gear 601B and the transfer cylinder gear 700B while maintaining the engagement with the second plate cylinder gear 601B and the transfer cylinder gear 700B. One end of a moving rod 804 is connected to a connecting arm 802a located on the second plate cylinder 601 side. The moving rod 804 has arrows A and B shown in FIG.
It can be moved in the direction of.

When adjusting the phase of the printing position in the vertical moving mechanism, the moving rod 804 is moved, for example, in the direction of arrow A. Then, this displacement amount is converted into a clockwise rotational displacement of the connecting arm 802a, and the idle gear 801a meshed with the second plate cylinder gear 601B.
Rolls in a clockwise direction on the second plate cylinder gear 601B. Therefore, the idle gear 801b rotates counterclockwise, and the transfer plate cylinder gear 700B and the transfer cylinder 700 are rotated clockwise. Thus, the printing start position on the transfer cylinder 700 can be adjusted with respect to the printing start position on the second plate cylinder 601, so that the printing start position between the two can be matched.

In the planetary gear mechanism constituted by such a gear group, the transfer cylinder gear 700B and the second plate cylinder gear 601B have the same number of teeth, and the idle gear 8
01a, the number of teeth of the idle gear 801b is set to be the same,
In addition, the number of teeth of the transfer cylinder gear 700B and the number of teeth of the second plate cylinder gear 601B are set to be an integral multiple of the number of teeth of the idle gear 801a and the idle gear 801b. By doing so, the idle gear 80 for adjusting the phase of the printing position can be used.
1a, 801b mesh with each other, idle gear 801a
And the second plate cylinder gear 601B, and the idle gear 801b and the transfer cylinder gear 700B are engaged in the same combination of teeth. If the ratio of the number of teeth is 1: 2 or 1: 3, the combination of teeth meshing every two or three rotations becomes the same, so that the meshing accuracy including the machining accuracy of the gears is somewhat poor. Also, the relative positional relationship between the second plate cylinder 601 and the transfer cylinder 700 can be kept unchanged. The top and bottom moving mechanism includes a first plate cylinder 201 and a second plate cylinder 601.
It is also possible to separately provide the print start position between the transfer cylinder 700 and the transfer cylinder 700.

The printing operation of the stencil printing apparatus 1 based on the above configuration will be described below. Prior to the printing operation,
The operator presses a print mode switching key on an operation panel (not shown) to select a print mode. The following modes are available for printing. 1. 1. Single-color duplex printing mode: Simultaneous double-sided printing with a single color 2. Front two-sided duplex printing mode: simultaneous two-sided printing of two front colors and one back color 3. Two-sided double-sided printing mode: Simultaneous double-sided printing of single-sided and two-colored backside 4. One-sided two-color printing mode: One-sided two-color printing 5. Full-color printing mode: full-color printing 6. Simplex printing mode: Simplex printing Continuous printing mode: One-sided or two-sided continuous printing

First, the case where the single-color double-sided printing mode is selected will be described with reference to FIG. Prior to printing, the used masters 101 and 501 wound on the first plate cylinder 201 and the second plate cylinder 601 are separated from the plate cylinder surface by a plate discharging device (not shown) and discarded. Then the first
In the plate making section 100, a plate making process is performed. In this processing step, the master 101, which has contacted the heating element of the thermal head 102, makes a perforation according to the image information by the heating element which is selectively heated according to an image reading signal from an image reading unit (not shown). It is formed. In addition,
At this time, the master 101 is driven by a transport mechanism using a stepping motor (not shown) as a driving source.
Of the stepping motor based on the count of the number of pulses of the stepping motor, and is thereby clamped by the clamper 204. In this state, the first plate cylinder 201 rotates at the same peripheral speed as the feeding speed of the master 101, and the master 101 is wound. When the feeding amount of the master 101 reaches a predetermined amount, this state is determined by the number of pulses of the stepping motor used for feeding the master 101, and the trailing end of the master 101 in the feeding direction is cut by the cutter 104.

When the winding of the master 101 around the first plate cylinder 201 is completed, the master 501
And the winding of the master 501 around the second plate cylinder 601 is performed. Second plate making section 500
In the plate making process, the original used in the plate making process in the first plate making section 100 is exchanged, and based on this document, the master 501 that contacts the heating element of the thermal head 502 is replaced.
The hole is formed in accordance with image information by the heating element which selectively generates heat in response to an image reading signal from an image reading unit (not shown). At this time, the master 50
1 is perforated plate-making so as to be a real image when viewed from the surface side of the second plate cylinder 601. The master 501 that has been made is the first
In the same manner as when the sheet is wound around the plate cylinder 201, the second plate cylinder 601 is fed to the stage 603 and cut according to the pulse number of the stepping motor used for feeding, and is placed on the second plate cylinder 601. Wound.

When the winding of the master 101 around the first plate cylinder 201 and the winding of the master 501 around the second plate cylinder 601 are completed, a transfer process is performed between the second plate cylinder 601 and the transfer cylinder 700. Is done. In this transfer process, the first plate cylinder 201 does not come into contact with the transfer cylinder 700, and only the second plate cylinder 601 comes into contact with the surface of the transfer cylinder 700 by the above-described advance / retreat mechanism. That is, when the arm stopper 207 is separated from the swinging end of the plate cylinder moving arm 214 by the solenoid 208 provided in the advance / retreat mechanism, the plate cylinder moving arm 214 is rocked by the urging force of the tension spring 212 and the cam follower 210 is moved. Faces the small diameter portion of the plate cylinder moving cam 211. Thus, the plate cylinder moving arm 206 can swing the second plate cylinder 601 in a direction in which the second plate cylinder 601 contacts the transfer cylinder 700.

Prior to this, the holding movable cam 710 and the opening movable cam 715 are moved to the non-clamp position and the non-open position, respectively. Next, by rotating the second plate cylinder 601 and the transfer cylinder 700 in contact with the surface of the transfer cylinder 700 in the clockwise direction and the counterclockwise direction, respectively, When the transfer of the print image from 601 is completed, the print paper S is fed from the first paper supply unit 300. When the printing paper S is fed from the first paper feeding unit 300, the state is detected by the printing paper detection sensor P, and the first printing drum 2 is moved by the reciprocating mechanism on the first printing drum 201 side.
01 advances into the transport path of the printing paper S and contacts the transfer cylinder 700. At this time, the clamper 70 of the clamp mechanism 700C
No. 6 does not open because the roller 708 does not contact the holding movable cam 710, so that the printing paper S is not held by the clamp mechanism 700C.

When the first plate cylinder 201 is in contact with the transfer cylinder 700, the transfer of ink to the transfer cylinder 700 through the perforated portion of the master 501 located on the second plate cylinder 601 is completed. Therefore, when the printing paper S is nipped and conveyed between the first plate cylinder 201 and the transfer cylinder 700, the image transfer is simultaneously performed on the front and back surfaces of the printing paper S. At this time, the used master 1001 wound on the third plate cylinder 1101 is not peeled off from the surface of the plate cylinder by a plate discharging device (not shown).
101 does not contact the transfer cylinder 700. Since the leading end of the printing paper S that has been subjected to the printing process is not clamped by the clamp mechanism 700C of the transfer cylinder 700, the first
The sheet is easily peeled off from the surface of the first plate cylinder 201 by the peeling claw 401A of the sheet discharging unit 400, and is sucked and conveyed toward the sheet discharging tray 400B by the suction and conveying device 402A of the conveying means 400A to be discharged. During the first double-sided printing, the image position after printing is observed, and if the image position is deviated, the printing start position on each of the front and back surfaces is adjusted by the above-described vertical movement mechanism.

After the adjustment of the top and bottom positions, when printing is performed for a predetermined number of prints, the second plate cylinder 601 and the transfer cylinder 700 that are in contact with the surface of the transfer cylinder 700 move clockwise. And continuously rotate in the counterclockwise direction.
The print image is transferred from the plate cylinder 601 to the transfer cylinder 700, and a predetermined number of printing papers S are fed out from the first paper supply unit 300 between the first plate cylinder 201 and the transfer cylinder 700 to perform each printing. Image transfer is simultaneously performed on both sides of the sheet S. When printing is performed by the same master, the surface of the transfer cylinder 700 is cleaned by the cleaning roller 701 each time the image printing with the ink transferred from the second plate cylinder 601 is completed or every predetermined number of times of printing. In addition, when the printing process is performed by a new master, the cleaning is, of course, performed at a stage before that, that is, at the time when the final printing by the master in the previous stage is completed.

In the above embodiment, the second plate cylinder 601 is used.
Is transferred to the transfer cylinder 700, the transfer cylinder 70
0 and the first plate cylinder 201, the printing paper S is nipped and conveyed to perform single-color double-sided printing.
Without using (therefore, it does not contact the transfer cylinder 700),
After transferring the ink image of the third plate cylinder 1101 to the transfer cylinder 700, the first image is transferred between the transfer cylinder 700 and the first plate cylinder 201.
The same single-color double-sided printing can be performed even when the printing paper S fed from the paper feeding unit 300 is nipped and conveyed. As shown in FIG. 13, after the ink image on the second plate cylinder 601 is transferred to the transfer cylinder 700, the transfer cylinder 700 and the third plate cylinder 11 that is brought into contact with the transfer cylinder 700 by an advance / retreat mechanism.
01, the printing paper S fed from the second paper feed unit 1300 is also nipped and conveyed, so that single-color double-sided printing can be performed. In this case, the opening movable cam 715 is
Is moved to the open position, and the nipping movable cam 7 is moved.
10 is moved to the non-clamp position, and the holding operation of the printing paper S is performed as shown in FIGS.
Done by As the rotation of the transfer cylinder 700 progresses, the roller 708 moves as shown in FIG.
The leading end of the printing paper S is opened toward the first paper discharge unit 400 after riding on the 15 convex surface 715c. Further, the first plate cylinder 201 is not used and is held at a position away from the transfer cylinder 700.

Next, a two-sided duplex printing mode for the front side (front side 2
The case in which the double-sided printing mode (color, single-sided printing) is selected will be described with reference to FIG. In the case of the front two-color duplex printing mode, before printing, the second plate cylinder 601 or the third plate cylinder 1101 or both are placed on the plate cylinder filled with the ink of the color intended by the user. It needs to be replaced. Prior to printing, first, second, and third plate cylinders 201, 6
01, used master 1 wound on 1101
01, 501, and 1001 are separated from the plate cylinder surface by a plate discharging device (not shown) and are discarded. Next, a plate making process is performed in the first plate making section 100. In this processing step, the master 101, which has contacted the heating element of the thermal head 102, makes a perforation according to the image information by the heating element which is selectively heated according to an image reading signal from an image reading unit (not shown). It is formed. At this time, the master 101 is fed toward the stage 203 of the first plate cylinder 201 by a transport mechanism using a stepping motor (not shown) as a driving source, and the feeding amount based on the count of the pulse number of the stepping motor is adjusted. By being controlled, it is clamped by the clamper 204. In this state, the first plate cylinder 201 rotates at the same peripheral speed as the feeding speed of the master 101, and the master 101 is wound.
When the feeding amount of the master 101 reaches a predetermined amount, this state is determined by the number of pulses of the stepping motor used for feeding the master 101, and the cutter 10
4, the rear end of the master 101 in the feeding direction is cut.

When the winding of the master 101 around the first plate cylinder 201 is completed, the master 501 is moved to the second plate making section 500.
And the winding of the master 501 around the second plate cylinder 601 is performed. Second plate making section 500
In the plate making process, the original used in the plate making process in the first plate making section 100 is exchanged, and based on this document, the master 501 that contacts the heating element of the thermal head 502 is replaced.
The hole is formed in accordance with image information by the heating element which selectively generates heat in response to an image reading signal from an image reading unit (not shown). At this time, the master 50
1 is perforated plate making so as to be a mirror image when viewed from the surface side of the second plate cylinder 601. The master 501 that has been made is the first
In the same manner as when the sheet is wound around the plate cylinder 201, the second plate cylinder 601 is fed to the stage 603 and cut according to the pulse number of the stepping motor used for feeding, and is placed on the second plate cylinder 601. Wound.

When the winding of the master 101 around the first plate cylinder 201 and the winding of the master 501 around the second plate cylinder 601 are completed, the master 10
01, and the third plate cylinder 1101
Is wound around the master 1001. In the plate making process in the third plate making section 1000, the second plate making section 500
The original used in the plate making process is replaced, and based on this original, the master 1001 in contact with the heating element of the thermal head 1002 is selectively heated according to an image reading signal from an image reading unit (not shown). The heat generating element forms a perforation according to the image information. At this time, the master 1001 is perforated and perforated so that it becomes a real image when viewed from the surface side of the third plate cylinder 1101. In the same manner as when the master 1001 is made into a plate, the third plate cylinder 1101 is fed to the stage 1103 and cut in accordance with the number of pulses of the stepping motor used for feeding, as in the case of winding the first plate cylinder 201. Around the third plate cylinder 1101.

First, second and third plate cylinders 201 and 60
1, 1011, masters 101, 501, 1001
Is completed, the third plate cylinder 1101 and the transfer cylinder 70
The transfer process is performed between 0 and 0. In this transfer process,
The first plate cylinder 201 and the second plate cylinder 601 do not come into contact with the transfer cylinder 700, and only the third plate cylinder 1101 comes into contact with the surface of the transfer cylinder 700 by the above-described advance / retreat mechanism. That is,
When the arm stopper 207 is separated from the tip of the plate cylinder moving arm 214 on the swinging side by the solenoid 208 mounted on the advance / retreat mechanism, the plate cylinder moving arm 214 is pulled by the tension spring 2.
12, the cam follower 210 faces the small diameter portion of the plate cylinder moving cam 211. As a result, the plate cylinder moving arm 214 moves the third plate cylinder 1101 to the transfer cylinder 700.
Can swing in the direction that comes into contact with.

Prior to this, the movable cam for clamping 710 is moved to the clamp position, and the movable cam for opening 715 is moved to the non-open position. Next, the third plate cylinder 1101 and the transfer cylinder 700 that are in contact with the surface of the transfer cylinder 700 rotate in the clockwise direction and the counterclockwise direction, respectively.
As the transfer of the print image from the third plate cylinder 1101 to 0 progresses, the printing paper S is fed from the first paper supply unit 300. When the printing paper S is fed from the first paper feeding unit 300, the state is detected by the printing paper detection sensor P, and the first printing drum 2 is moved by the reciprocating mechanism on the first printing drum 201 side.
01 advances into the transport path of the printing paper S and contacts the transfer cylinder 700. At this time, since the movable cam 710 for clamping is in the clamp position, the roller 708 of the clamping mechanism 700C rides on the convex surface 710c of the movable cam 710 for clamping, and the timing at which the printing paper S is fed out from the first paper supply unit 300 and the clamper 706 Is synchronized with the opening timing, and the printing paper S
Is pinched.

When the first plate cylinder 201 is in contact with the transfer cylinder 700, the third plate cylinder 1101
Since the transfer of the ink through the perforated portion of the master 1001 located above has been completed, the printing paper S is transferred to the first plate cylinder 20.
1 and the transfer cylinder 700, the printing paper S
The image transfer is performed simultaneously on the front and back surfaces of. Since the opening movable cam 715 is in the non-open position, the clamper 706 is opened.
Does not open. For this reason, the printed printing paper S is not peeled from the surface of the first plate cylinder 201 by the peeling claw 401A of the first paper discharge unit 400, and the transfer cylinder 700 is continuously rotated in the counterclockwise direction. The second plate cylinder 60
It reaches the point of contact with 1.

At this time, the second plate cylinder 601 comes into contact with the surface of the transfer cylinder 700 by the advance / retreat mechanism. That is, when the arm stopper 207 is separated from the tip of the plate cylinder moving arm 214 on the swinging side by the solenoid 208 provided in the advance / retreat mechanism, the plate cylinder moving arm 206 is rocked by the urging force of the tension spring 212 and the cam follower 210 is moved. Faces the small diameter portion of the plate cylinder moving cam 211. As a result, the plate cylinder moving arm 214 swings in a direction in which the second plate cylinder 601 contacts the transfer cylinder 700. In this way, the second plate cylinder 601 comes into contact with the transfer cylinder 700, so that the second
The image of the master 501 of the plate cylinder 601 is transferred. Therefore, the master 1 of the first plate cylinder 201 is provided on the surface of the printing paper S.
01 and the image by the master 501 of the second plate cylinder 601 are transferred, and the image by the master 1001 of the third plate cylinder 1101 is transferred to the back surface. Since the second plate cylinder 601 and the third plate cylinder 1101 are previously filled with the ink of the color intended by the user, double-sided printing with two colors on the front side and single color on the back side is performed.

The printing paper S that has been subjected to the printing process is supplied with a roller 708.
Rides on the convex surface 720b of the fixing cam 720 for opening, so that the tip is opened. For this reason, the transporting unit 90 can be easily operated by the peeling claw 901A of the second paper discharge unit 900.
0A, and the suction conveyance device 90 of the conveyance means 900A.
It is suctioned and conveyed toward the guide plate 920 by 2A.
Further, the conveyance direction is changed by the guide plate 920, and the conveyance direction is guided to the conveyance unit 910A. The suction conveyance unit 912A of the conveyance unit 910A sucks and conveys the paper toward the discharge tray 900B and discharges it.

During the first double-sided printing, the image position after printing is observed, and if the image position is deviated, the printing start position on each of the front and back sides is adjusted by the above-described vertical movement mechanism. After the adjustment of the top and bottom positions, when printing a predetermined number of prints, the first plate cylinder 201 and the transfer cylinder 7
00, a predetermined number of printing papers S are fed from the first paper supply unit 300, and the image of the master 101 of the first plate cylinder 201 and the image of the master 501 of the second plate cylinder 601 are printed on each printing paper. S, and the third plate cylinder 110
The image from the first master 1001 is transferred to the back surface of the printing paper S via the transfer cylinder 700. Transfer cylinder 700
Is the third plate cylinder 1 when printing with the same master
Each time image printing with the ink transferred from 101 is completed, or every predetermined number of printings, the cleaning roller 7
01 cleans the surface. In addition, when the printing process is performed by a new master, the cleaning is, of course, performed at a stage before that, that is, at the time when the final printing by the master in the previous stage is completed.

Next, another embodiment in a case where the above-described two-sided-surface double-sided printing mode is selected will be described with reference to FIG. The major difference from the above example is that the paper feed path is different. The plate making process for the masters 101, 501, and 1001 in the plate making units 100, 500, and 1000, and the contact process of the plate cylinders 201, 601, and 1101 with the transfer cylinder 700 are the same as those in the above-described embodiment, and thus detailed description is omitted. I do.

Prior to printing, the first, second and third plate cylinders 2
The used masters 101, 501, and 1001 wound on 01, 601, and 1101 are peeled off the plate cylinder surface by a plate discharging device (not shown) and discarded. Then
When the plate making process is performed in the first plate making section 100 and the winding of the master 101 around the first plate cylinder 201 ends, the third
In the plate making section 1000, plate making of the master 1001 is performed, and the master 10
01 winding is performed. Further, the first plate cylinder 201,
When the winding of the masters 101 and 1001 around the third plate cylinder 1101 is completed, the master 5
01 is performed, and the master 501 is wound around the second plate cylinder 601. At this time, the master 501 is perforated to make a real image when viewed from the surface side of the second plate cylinder 601.

First, second and third plate cylinders 201 and 60
1, 1011, masters 101, 501, 1001
Is completed, the second plate cylinder 601 and the transfer cylinder 700
The transfer process is performed between. In this transfer process, the first plate cylinder 201 and the third plate cylinder 1101 do not come into contact with the transfer cylinder 700, and only the second plate cylinder 601 is moved to the surface of the transfer cylinder 700 by the above-described advance / retreat mechanism. Abut

Prior to this, the holding movable cam 710 is moved to the unclamping position, and the opening movable cam 715 is moved to the opening position. Next, the second plate cylinder 601 and the transfer cylinder 700 that are in contact with the surface of the transfer cylinder 700 rotate in the clockwise direction and the counterclockwise direction, respectively.
When the transfer of the print image from the second plate cylinder 601 to the printing paper advances, the printing paper S is fed out from the second paper supply unit 1300. When the printing paper S is fed out from the second paper supply unit 1300, the state is detected by the printing paper detection sensor P, and the third printing drum 1101 conveys the printing paper S by the reciprocating mechanism on the third printing drum 1101 side. Advances to the road, transfer cylinder 700
Abut. At this time, the roller 70 of the clamp mechanism 700C
Since the roller 8 moves on the convex surface 730b of the fixing cam 730 for clamping, the timing at which the printing paper S is fed out from the second paper supply unit 1300 and the timing at which the clamper 706 is opened are synchronized, and the leading end of the printing paper S is clamped.

When the third plate cylinder 1101 is in contact with the transfer cylinder 700, the second plate cylinder 601 is
Since the transfer of the ink through the perforated portion of the master 501 located above has been completed, the printing paper S is transferred to the third plate cylinder 110.
1 and the transfer cylinder 700, the printing paper S
The image transfer is performed simultaneously on the front and back surfaces of. Since the nipping movable cam 710 is in the non-clamp position, the clamper 7
06 does not open. For this reason, the printing paper S that has been
Is maintained in a state of being clamped by the clamper 706, and the transfer cylinder 700 continues to rotate counterclockwise to reach the contact point with the first plate cylinder 201.

At this time, the first plate cylinder 201 comes into contact with the surface of the transfer cylinder 700 by the advance / retreat mechanism. In this way, the first plate cylinder 201 comes into contact with the transfer cylinder 700,
An image of the master 101 of the first plate cylinder 201 is transferred to the printing paper S. Therefore, the image of the third plate cylinder 1101 by the master 1001 and the first plate cylinder 2
The image from the master 101 of the second plate cylinder 601 is transferred to the transfer cylinder 70 on the back surface.
0 is transcribed. Since the second plate cylinder 601 and the third plate cylinder 1101 are previously filled with the ink of the color intended by the user, double-sided printing with two colors on the front side and single color on the back side is performed.

The printing paper S that has been subjected to the printing process is a roller 708.
Rides on the convex surface 715c of the opening movable cam 715, thereby opening the distal end. For this reason, the transporting means 40 can be easily operated by the peeling claw 401A of the first paper discharging unit 400.
0A, and the suction conveyance device 40 of the conveyance means 400A.
2A sucks and conveys the paper toward the paper discharge tray 400B and discharges it.

As described above, it is possible to switch between single-color printing and multi-color printing by switching the paper feeding unit (claim 7). During the first double-sided printing, the image position after printing is observed, and if the image position is deviated, the printing start position on each of the front and back surfaces is adjusted by the above-described vertical movement mechanism. When the printing of a predetermined number of prints is performed after the adjustment of the top and bottom positions, a predetermined number of print sheets S are supplied from the second paper supply unit 1300 between the third plate cylinder 1101 and the transfer cylinder 700. The master 1 of the third plate cylinder 1101 is extended.
001 and the master 101 of the first plate cylinder 201
Is transferred to the front surface of each print sheet S, and the image by the master 501 of the second plate cylinder 601 is transferred to the back surface of the print sheet S via the transfer cylinder 700. Transfer cylinder 7
When the printing is performed by the same master, the cleaning roller 7 is used every time the image printing with the ink transferred from the second plate cylinder 601 is completed, or every predetermined number of times of printing.
01 cleans the surface. In addition, when the printing process is performed by a new master, the cleaning is, of course, performed at a stage before that, that is, at the time when the final printing by the master in the previous stage is completed.

Next, the case where the back side two-color double-sided printing mode is selected will be described with reference to FIG. Also in this case, before printing, the first plate cylinder 201, the second plate cylinder 601 or the third plate cylinder 1101 is replaced with a plate cylinder filled with ink of a color intended by the user. There is a need. Prior to printing, first, second, and third plate cylinders 201, 601, 1
Used masters 101 and 5 wound on 101
01 and 1001 are separated from the plate cylinder surface by a plate discharging device (not shown) and are discarded. Next, the first plate making unit 100
When the master 101 is wound around the first plate cylinder 201 and the master 101 is wound around the first plate cylinder 201, the third plate making unit 1000 performs the plate making of the master 1001 and the master 1001 with respect to the third plate cylinder 1101. Winding is performed. At this time, the master 1001 holds the third plate cylinder 110
The plate is perforated so as to become a real image when viewed from the front side of the plate 1.
Furthermore, when the winding of the masters 101 and 1001 on the first plate cylinder 201 and the third plate cylinder 1101 is completed, the master making of the master 501 is performed in the second plate making unit 500 and the second plate cylinder 601 is formed. The winding of the master 501 is performed. At this time, the master 501 holds the second plate cylinder 6
01 is perforated to make a real image when viewed from the surface side.

First, second and third plate cylinders 201 and 60
1, 1011, masters 101, 501, 1001
Is completed, the second plate cylinder 601 and the transfer cylinder 700
The transfer process is performed between. In this transfer process, the first plate cylinder 201 and the third plate cylinder 1101 do not come into contact with the transfer cylinder 700, and only the second plate cylinder 601 is moved to the surface of the transfer cylinder 700 by the above-described advance / retreat mechanism. Abut

Prior to this, the holding movable cam 710 and the opening movable cam 715 are moved to the non-clamp position and the non-open position, respectively. Next, the second plate cylinder 601 and the transfer cylinder 700 that are in contact with the surface of the transfer cylinder 700 rotate in the clockwise direction and the counterclockwise direction, respectively, so that the second plate cylinder to the transfer cylinder 700 is rotated. When the transfer of the print image from 601 proceeds, and the transfer cylinder 700 continues to rotate in the counterclockwise direction, the leading end of the image transferred by the master 501 of the second plate cylinder 601 is brought into contact with the third plate cylinder 1101. To the point of contact. At this time, the third plate cylinder 1101 comes into contact with the surface of the transfer cylinder 700 by the advance / retreat mechanism.

As described above, when the third plate cylinder 1101 comes into contact with the transfer cylinder 700, the image by the master 501 of the second plate cylinder 601 and the master 1001 of the third plate cylinder 1101 are provided on the transfer cylinder 700. Is transferred.
Subsequently, the transfer cylinder 700 continues to rotate counterclockwise,
As the transfer of the image by the master 501 of the second plate cylinder 601 and the image by the master 1001 of the third plate cylinder 1101 progresses, the printing paper S is fed from the first paper supply unit 300. When the printing paper S is fed from the first paper feeding unit 300, the state is detected by the printing paper detection sensor P, and the first printing drum 2 is moved by the reciprocating mechanism on the first printing drum 201 side.
01 advances into the transport path of the printing paper S and contacts the transfer cylinder 700. At this time, the roller 708 of the clamp mechanism 700C does not contact the holding movable cam 710, so that the leading end of the printing paper S is not held by the clamper 706.

In the state where the first plate cylinder 201 is in contact with the transfer cylinder 700, the perforated portions of the master 501 located on the second plate cylinder 601 and the master 1001 of the third plate cylinder 1101 with respect to the transfer cylinder 700. Is completed, the printing paper S is transferred to the first plate cylinder 201 and the transfer cylinder 70.
0, the image by the master 101 of the first plate cylinder 201 is transferred to the front surface of the printing paper S, and the master 501 and the third plate cylinder 1 of the second plate cylinder 601 are transferred to the back surface.
The image of the master 1001 is transferred through the transfer cylinder 700. First, the first plate cylinder 201 and the second plate cylinder 60
The first or third plate cylinder 1101 is filled with ink of a color intended by the user, so that
Color double-sided printing is performed.

Since the leading end of the printed printing paper S is not held by the clamper 706, the first
The sheet is easily peeled off from the surface of the first plate cylinder 201 by the peeling claw 401A of the sheet discharging unit 400, and is sucked and conveyed toward the sheet discharging tray 400B by the suction and conveying device 402A of the conveying means 400A to be discharged.

During the first double-sided printing, the image position after printing is observed, and if the image position is deviated, the printing start position on each of the front and back surfaces is adjusted by the above-described vertical movement mechanism. After the adjustment of the top and bottom positions, when printing of a predetermined number of prints is performed, the second and third plate cylinders 601 and 1101 that are in contact with the surface of the transfer cylinder 700 and the transfer cylinder 7
00 continuously rotates in a clockwise direction and a counterclockwise direction, respectively, so that image transfer from the second plate cylinder 601 and the third plate cylinder 1101 to the transfer cylinder 700 is performed, and the first A predetermined number of printing papers S are fed from the first paper supply unit 300 between the plate cylinder 201 and the transfer cylinder 700, and image transfer is simultaneously performed on both front and back surfaces of each printing paper S. When printing is performed by the same master, the transfer cylinder 700 uses the cleaning roller 701 every time image printing with ink transferred from the second plate cylinder 601 and the third plate cylinder 1101 is completed, or every predetermined number of times of printing. The surface is cleaned. In addition, when the printing process is performed by a new master, the cleaning is, of course, performed at a stage before that, that is, at the time when the final printing by the master in the previous stage is completed.

Next, the case where the single-sided two-color printing mode is selected will be described with reference to FIG. Since the printing process in the one-sided two-color printing mode corresponds to the case where the backside transfer is not performed in the above-described two-sided front-side printing mode, detailed description of the plate making process and the like is omitted. For example, the printing paper S is the first
The roller 708 is fed out from the paper feeding unit 300, and the leading end of the roller 708 is held by the ramper 706 by riding on the holding cam 710.
Then, the image of the master 501 of the second plate cylinder 601 is transferred. Thereafter, the leading end of the printing paper S is released by the roller 708 riding over the opening fixed cam 720, and the paper output tray 900B is transported by the transporting means 900A and 910A.
It is discharged toward. Thereafter, in the same manner, during the first two-color printing on one side, the image position after printing is observed, and if the image position is shifted, the printing start position between the colors is adjusted by the above-described vertical movement mechanism. When the printing of a predetermined number of prints is performed after the adjustment of the top and bottom positions, a predetermined number of print sheets S are supplied from the first paper supply unit 300 between the first plate cylinder 201 and the transfer cylinder 700. Unfolded, the first plate cylinder 201
The image from the master 101 and the image from the master 501 of the second plate cylinder 601 are transferred to the printing paper S.

As shown in FIG. 13, the first plate cylinder 2
01 and the third plate cylinder 1101, the second sheet feeding unit 130
The same single-sided, two-color printing mode can be performed in the process of feeding the printing paper S from 0 and discharging the printing paper S to the first paper output unit 400.

Next, the case where the full-color printing mode is selected will be described with reference to FIG. Before printing, the plate cylinder filled with cyan, magenta and yellow inks
First plate cylinder 201, second plate cylinder 601 and third plate cylinder 11
01 needs to be replaced. Also in this case, the masters 101, 50 in each of the plate making units 100, 500, 1000
1, 1001 and the plate cylinders 201, 6
The steps of abutting the transfer cylinders 01 and 1101 with the transfer cylinder 700 are the same as those in the above-described embodiment, and therefore detailed description is omitted.

Prior to printing, the first, second and third plate cylinders 2
The used masters 101, 501, and 1001 wound on 01, 601, and 1101 are peeled off the plate cylinder surface by a plate discharging device (not shown) and discarded. Then
When the plate making process is performed in the first plate making section 100 and the winding of the master 101 around the first plate cylinder 201 is completed, the second
In the plate making section 5000, plate making of the master 501 is performed, and winding of the master 501 around the second plate cylinder 601 is performed. Further, when the winding of the masters 101 and 501 on the first plate cylinder 201 and the second plate cylinder 601 is completed, the master making of the master 1001 is performed in the third plate making unit 1000 and the third plate cylinder 1101 The winding of the master 1001 is performed.

Prior to this, the movable cam for holding 710 is moved to the non-clamp position, and the movable cam for opening 715 is moved to the non-open position. Next, the transfer cylinder 700 rotates counterclockwise, and the printing paper S is fed out from the second paper feeding unit 1300. When the printing paper S is fed out from the second paper supply unit 1300, the state is detected by the printing paper detection sensor P, and the third printing drum 1101 conveys the printing paper S by the reciprocating mechanism on the third printing drum 1101 side. Advances to the road, transfer cylinder 700
Abut. At this time, the roller 70 of the clamp mechanism 700C
Since the roller 8 moves on the convex surface 730b of the fixing cam 730 for clamping, the timing at which the printing paper S is fed out from the second paper supply unit 1300 and the timing at which the clamper 706 is opened are synchronized, and the leading end of the printing paper S is clamped.

When the printing sheet S is nipped and conveyed between the third plate cylinder 1101 and the transfer cylinder 700, an image from the master 1001 of the third plate cylinder 1101 is transferred to the printing sheet S. Since the printing paper S on which the printing process has been performed does not make the rollers 708 of the clamp mechanism 700C contact the nipping movable cam 710, the transfer cylinder 700 continues to rotate in the counterclockwise direction, so that the first printing drum S remains nipped. The contact with 201 is reached. At this time, the first plate cylinder 201 comes into contact with the surface of the transfer cylinder 700 by the advance / retreat mechanism, and the first plate cylinder 201 is attached to the printing paper S.
The image by the master 101 is transferred. Since the printing paper S on which the printing process has been performed does not cause the roller 708 to come into contact with the opening movable cam 715, the transfer cylinder 700 is continuously rotated in the counterclockwise direction without being peeled by the peeling claw 401 </ b> A of the first paper discharge unit 400. By doing so, it reaches the contact point with the second plate cylinder 601 while being held. At this time, the second plate cylinder 601 contacts the surface of the transfer cylinder 700 by the advance / retreat mechanism,
The image from the master 501 of the second plate cylinder 601 is transferred to the printing paper S.

Therefore, on the surface of the printing paper S, the image by the master 1001 of the third plate cylinder 1101 and the first plate cylinder 2
The image of the master 101 of the second plate cylinder 601 and the image of the master 501 of the second plate cylinder 601 are transferred. In advance, the second plate cylinder 601, the second plate cylinder 601 and the third plate cylinder 1101
Is filled with cyan, magenta, and yellow inks, so that full-color printing is performed.

The printing paper S that has been subjected to the printing process is
Rides on the convex surface 720b of the fixing cam 720 for opening, so that the tip is opened. For this reason, the transporting unit 90 can be easily operated by the peeling claw 901A of the second paper discharge unit 900.
0A, and the suction conveyance device 90 of the conveyance means 900A.
It is suctioned and conveyed toward the guide plate 920 by 2A.
Further, the conveyance direction is changed by the guide plate 920, and the conveyance direction is guided to the conveyance unit 910A. The suction conveyance unit 912A of the conveyance unit 910A sucks and conveys the paper toward the discharge tray 900B and discharges it.

During the first double-sided printing, the image position after printing is observed, and if the image position is shifted, the printing start position between the colors is adjusted by the above-described vertical movement mechanism. After the adjustment of the top and bottom positions, when printing a predetermined number of prints, the third plate cylinder 1101 and the transfer cylinder 7
00, a predetermined number of printing papers S are fed out of the second paper supply unit 1300 and the master 100 of the third plate cylinder 1101 is fed out.
1 and the image of the master 101 of the first plate cylinder 201 and the image of the master 501 of the second plate cylinder 601 are transferred to each printing sheet S.

Next, the case where the single-sided printing mode is selected will be described with reference to FIG. Prior to printing, the used master 101 wound on the first plate cylinder 201 is separated from the surface of the plate cylinder by a plate discharging device (not shown) and discarded. Next, a plate making process is performed in the first plate making section 100, and the winding of the master 101 around the first plate cylinder 201 is completed. Second plate cylinder 601 and third plate cylinder 1101
The used master wound above is left on the surface of the plate cylinder, and is discarded as described above when the original needs to be changed next.

Prior to this, the movable cam for clamping 710 is moved to the non-clamp position and the movable cam for opening 715 is moved to the non-open position. When the winding of the master 101 around the first plate cylinder 201 is completed, the printing paper S is fed from the first paper supply unit 300. When the printing paper S is fed from the first paper supply unit 300, the state is detected by the printing paper detection sensor P, and the first printing drum 201 is transported by the first printing drum 201 by the reciprocating mechanism on the first printing drum 201 side. It advances to the road and contacts the transfer cylinder 700. At this time, the clamper 7 of the clamp mechanism 700C
No. 06 does not open because the roller 708 does not contact the nipping movable cam 710, and thus the printing paper S is not nipped by the clamp mechanism 700C.

When the printing paper S is nipped and conveyed between the first plate cylinder 201 and the transfer cylinder 700, an image by the master 101 of the first plate cylinder 201 is transferred to the surface of the printing paper S. Since the printing paper S that has been subjected to the printing process is not pinched by the clamp mechanism 700C of the transfer cylinder 700, the printing paper S is easily peeled from the surface of the first plate cylinder 201 by the peeling claw 401A of the first paper discharge unit 400. Transport means 4
00A suction discharge device 402A
It is sucked and conveyed toward 0B and discharged. Similarly,
At the time of the first double-sided printing, the image position after printing is observed, and if the image position is shifted, the printing start position is adjusted by the above-described vertical movement mechanism in the same manner as in each mode described above. Thereafter, when printing is performed for a predetermined number of prints, a predetermined number of print papers S are fed out from the first paper supply unit 300 between the first plate cylinder 201 and the transfer cylinder 700, and each print paper S Image transfer is performed on the surface.

As is apparent from the above description, in the single-sided printing mode (single-sided single-color printing mode), only one plate cylinder is used, and the other plate cylinders do not contact the transfer cylinder 700. Therefore, the transfer cylinder 700 functions as a pressing unit that presses the printing paper S against the used plate cylinder. Although only the example using the first plate cylinder 201 has been described, of course,
The present invention can also be implemented using the second plate cylinder 601 or the third plate cylinder 1101. In the case where the second plate cylinder 601 is used, FIG.
As shown in FIG. 5, a paper feeding mode in which the printing paper S is fed from the first paper feeding unit 300 and discharged to the second paper discharging unit 900 (in this case, the first plate cylinder 201 and the third plate cylinder 1101 are transfer cylinders) 7
00), as shown in FIG. 14, the printing paper S is fed out from the second paper feeding unit 1300 and the second paper discharging unit 90
0 (the first plate cylinder 201 also in this case)
And the third plate cylinder 1101 does not contact the transfer cylinder 700). When the third plate cylinder 1101 is used,
As shown in FIG. 13, a printing mode in which the printing paper S is fed from the second paper feeding unit 1300 and discharged to the first paper discharging unit 400 (in this case, the first plate cylinder 201 and the second plate cylinder 601 are transferred When the printing form is not brought into contact with the drum 700, the printing paper S is fed out from the second paper feeding unit 1300 and discharged to the second paper discharging unit 900 as shown in FIG.
Of the plate cylinder 201 and the second plate cylinder 601 do not contact the transfer cylinder 700). In the above description, the single-sided printing mode in which printing is performed only on the front side of the printing paper S has been described. For example, the image of the second plate cylinder 601 or the third plate cylinder 1101 is transferred to the transfer cylinder 700, and the first sheet feeding unit 3
00, the printing paper S is fed out, sandwiched and conveyed between the transfer cylinder 700 and the first plate cylinder 201, and discharged to the first paper discharge unit 400. In this case, prior to printing, the used master 101 is provided on the first plate cylinder 201 as a pressing means in order to prevent ink contamination on the front side of the printing paper S.
Is peeled off, and an unmade master is wound. The paper feed mode in this case is as shown in FIG. Further, the image of the second plate cylinder 601 is transferred to the transfer cylinder 700, and
300, the printing paper S is fed out, and the transfer cylinder 700 and the third
Between the plate cylinder 1101 and the first discharge unit 400
There is a method to discharge to. Also in this case, before printing, an unprinted master is wound around the third plate cylinder 1101 as a pressing means after the used master 101 is peeled off.
The paper feeding mode in this case is as shown in FIG. As described above, when performing single-sided printing on only the back surface via the transfer cylinder 700, the so-called set-off phenomenon when the printing paper S is discharged and stacked can be prevented because the drying efficiency of the ink image is high. There are advantages.

Next, the case where the continuous printing mode is selected will be described with reference to FIGS. First, the case of single-sided continuous printing (single-sided single-color printing) will be described with reference to FIG. In the case of single-sided continuous printing, continuous printing is started through exactly the same steps as in the case of the single-sided printing mode described above. Is discharged. When all of the printing papers S set in advance in a paper feed cassette (not shown) of the first paper feed unit 300 are used, the main control unit 100 When it is determined that the sheet cassette is empty, the solenoid 713 is driven to move the opening movable cam 715 from the non-open position indicated by the solid line to the open position indicated by the broken line. Next, the printing paper S is continuously supplied from the second paper supply unit 1300 (claim 8). Since the roller 708 of the clamp mechanism 700C runs on the convex surface 730b of the fixing fixed cam 730, the second
The timing at which the printing paper S is fed from the paper feeding unit 1300 and the timing at which the clamper 706 opens are synchronized, and the leading end of the printing paper S is clamped. Further, as the transfer cylinder 700 rotates, the printing paper S reaches the contact point with the first plate cylinder 201 while being held by the clamper 706. At this time,
The first plate cylinder 201 comes into contact with the transfer cylinder 700 by the advance / retreat mechanism, and the image of the first plate cylinder 201 by the master 101 is transferred. Since the opening movable cam 715 is at the open position, the leading end of the printed printing paper S is opened,
The paper is discharged by the first paper discharge unit 400.

Next, the case of continuous printing of two colors on one side is shown in FIG.
It will be described based on. Also in the case of single-sided two-color continuous printing, continuous printing is started through exactly the same steps as in the case of the single-sided two-color printing mode described above. It is discharged to the unit 900. First
When all of the printing papers S set in advance in a paper feeding cassette (not shown) of the paper feeding unit 300 are used, the main control unit performs the first control based on a signal from a paper detection sensor (not shown).
When it is determined that the sheet cassette of the sheet feeding unit 300 is empty, the solenoid 713 is driven to move the pinching movable cam 710.
Is moved from the clamp position shown by the solid line to the non-clamp position shown by the broken line. Next, the printing paper S is continuously supplied from the second paper supply unit 1300. Clamp mechanism 700C
Since the roller 708 rides on the convex surface 730b of the fixing fixed cam 730, the timing at which the printing paper S is fed out from the second paper supply unit 1300 and the timing at which the clamper 706 opens are synchronized, and the leading end of the printing paper S is nipped. . Further, as the transfer cylinder 700 rotates, the printing paper S reaches the contact point with the first plate cylinder 201 while being held by the clamper 706. Here, the image from the master 101 of the first plate cylinder 201 is transferred, and the transfer cylinder 700 further rotates to reach a contact point with the second plate cylinder 601. Here, the image by the master 501 of the second plate cylinder 601 is transferred,
The paper is discharged by the second paper discharge unit 900. In the case of single-sided, two-color continuous printing, the third plate cylinder 1101 is a transfer cylinder 700
Do not abut.

In the continuous printing mode, since the printing paper S can be continuously supplied from the two paper feeding units alternately, if the printing paper S is set in the paper feeding unit on the idle side during printing, a large amount of printing can be performed. This can be done without stopping the device. In the case of single-sided continuous printing, if the master 101 on the first plate cylinder 201, the master 1001 on the third plate cylinder 1101, and the master 501 on the second plate cylinder 601 are perforated and made with the same original, As shown in FIG.
0, the stencil printing apparatus by combining the second paper supply unit 1300 with the first paper discharge unit 400 and the second paper discharge unit 900 and printing by appropriately switching the positions of the nipping movable cam 710 and the opening movable cam 715. Since the amount of ink that can be held in one unit is apparently tripled, it is possible to transfer an image to a larger amount of printing paper S without stopping the apparatus (claim 9).

Further, three plate cylinders 2 are provided around the transfer cylinder 700.
01, 601, and 1101 and the first sheet feeding unit 300,
Second paper supply unit 1300, first paper discharge unit 400, second paper discharge unit 9
As shown in Table 2, various single-sided printings can be performed only on the surface of the printing paper S by combining the positions of the printing paper S and the fixing cam 710 and switching the positions of the holding movable cam 710 and the opening movable cam 715 as appropriate. . In Table 2,
Reference numeral 300 denotes a first sheet feeding unit, 1300 denotes a second sheet feeding unit, 40
0 denotes a first paper discharge unit, 900 denotes a second paper discharge unit, and the cam 710 (moving cam 710 for holding) and the cam 115
In the column of (opening movable cam 715), A indicates the non-clamp position or the non-open position, and B indicates the clamp position or the open position.

[0103]

[Table 2]

In each of the above embodiments, the transfer cylinder 70
Although the first plate cylinder 201, the second plate cylinder 601 or the third plate cylinder 1101 is brought into contact with the transfer cylinder 700 with respect to the transfer cylinder 700, the plate cylinder comes into contact with and separates from the transfer cylinder 700. For example, the member on the plate cylinder side that supports the master has flexibility, and the ink roller 205 of the first plate cylinder 201, the ink roller 605 of the second plate cylinder 601, It is also possible to swing the ink roller 1105 of the third plate cylinder 1101 toward the transfer cylinder 700, that is, to swell a partial area of the master.

[0105]

According to the first aspect of the present invention, a configuration is provided in which a plurality of plate cylinders and a transfer cylinder having a function of clamping printing paper are provided. Printing and one-step multicolor printing can be performed. further,
Since a plurality of paper feed units are provided, various printing can be performed.

According to the second aspect of the present invention, since the clamp mechanism of the transfer cylinder is configured to be opened and closed by the clamp opening / closing member using the rotation of the transfer cylinder, the opening and closing of the clamp mechanism that changes according to the print mode. Can be reliably performed with a simple configuration without using complicated electric control, and an increase in cost in supporting all print modes can be suppressed.

According to the third aspect of the present invention, since three or more plate cylinders are arranged around the transfer cylinder, a wide variety of printing can be performed in combination with a plurality of paper feed units. it can.

According to the fourth aspect of the present invention, since the clamp opening / closing member is constituted by the movable cam and the fixed cam, only a necessary portion can be constituted, and the construction of the clamp opening / closing member can be simplified. .

According to the fifth aspect of the present invention, since the clamp opening / closing member is composed of the holding movable cam, the holding fixed cam, the opening movable cam and the opening fixed cam, the clamp is complicated. Opening and closing can be performed with a simple configuration.

According to the sixth aspect of the invention, the movable cam for holding and the movable cam for opening are configured to be moved to appropriate positions by the driving member in accordance with the input of the print mode. There is no need to perform positioning, and operability can be improved.

According to the seventh aspect of the present invention, switching between single-color printing and multi-color printing on the front and back surfaces of the printing paper is performed by switching the paper feeding unit, so that components such as the plate cylinder can be integrated. Thus, the device can be made more compact.

According to the eighth aspect of the present invention, since one-sided printing or one-sided two-color printing can be continuously performed by switching the paper feeding unit without stopping the apparatus, the work efficiency in the case of mass printing can be improved. Can be.

According to the ninth aspect of the present invention, since the printing paper is supplied to the plurality of plate cylinders from the plurality of paper feeding units, the stencil printing paper wound around each plate cylinder is the same. When plate making is performed using the original, the continuous printing can be performed until the ink capacity (printing capacity) of all the plate cylinders is lost, and the capacity of mass printing can be further improved.

[Brief description of the drawings]

FIG. 1 is an overall schematic diagram showing one embodiment of a stencil printing apparatus according to the present invention.

FIG. 2 is a side view showing an advance / retreat mechanism of a first plate cylinder in the stencil printing apparatus shown in FIG.

FIG. 3 is a perspective view showing a clamp mechanism and an opening / closing member thereof in the stencil printing apparatus shown in FIG. 1;

FIG. 4 is a stencil printing apparatus shown in FIG. 1 in a state in which a movable cam for holding is in a clamp position, a movable cam for opening is in a non-open position, and a clamper is closed and a leading end portion of printing paper is clamped; FIG.

FIG. 5 is a stencil printing apparatus shown in FIG. 1 in which the movable cam for clamping is at the clamp position, the movable cam for opening is at the non-open position, and It is a side view which shows the state which opened.

FIG. 6 shows the stencil printing apparatus shown in FIG. 1 in a state in which the movable cam for opening is in the open position, the movable cam for clamping is in the unclamped position, and the clamper is opened in the position of the first sheet discharging unit. FIG.

FIG. 7 is a stencil printing apparatus shown in FIG. 1, in which the movable cam for holding is in the non-clamping position, the movable cam for opening is in the non-opening position, and the clamper is opened at the position of the second paper discharge unit; It is a side view showing a state.

FIG. 8 is a stencil printing machine shown in FIG. 1 in which the nipping movable cam is at the unclamping position, the opening movable cam is at the opening position, and the clamper is moved relative to the sheet feeding timing from the second sheet feeding unit. It is a side view which shows the state which opened.

FIG. 9 is a side view showing a state in which the clamper is closed from the state of FIG. 8 and the leading end of the printing paper is clamped.

FIG. 10 is a side view showing a top and bottom moving mechanism in the stencil printing apparatus shown in FIG. 1;

FIG. 11 is a schematic side view showing a paper feed path in the stencil printing apparatus shown in FIG.

FIG. 12 shows a stencil printing machine shown in FIG.
FIG. 2 is a schematic side view illustrating a paper feed path in a color double-sided printing mode.

FIG. 13 is a schematic side view showing a modified example of the front two-color duplex printing mode.

FIG. 14 is a schematic side view showing a paper feed path in a full-color printing mode in the stencil printing machine shown in FIG. 1;

FIG. 15 is a schematic side view showing a paper feed path in the case of single-sided continuous printing in the stencil printing machine shown in FIG. 1;

FIG. 16 shows a stencil printing machine shown in FIG.
FIG. 3 is a schematic side view illustrating a paper feed path in the case of color continuous printing.

17 is a schematic side view showing a paper feed path when paper is fed from three paper feed units to three plate cylinders in the stencil printing apparatus shown in FIG.

FIG. 18 is a schematic view showing a conventional stencil printing apparatus compatible with simultaneous double-sided printing.

FIG. 19 is a schematic diagram showing a conventional stencil printing apparatus that supports double-sided simultaneous printing using a transfer cylinder.

FIG. 20 is a schematic view showing a conventional stencil printing apparatus for one-step multi-color printing.

[Explanation of symbols]

101, 501, 1001 Master as stencil printing base paper 201 First plate cylinder 300 First paper feed unit 400 First paper discharge unit 601 Second plate cylinder 700C Clamp mechanism 710 Nipping movable cam 713 as a clamp opening / closing member Solenoid as a driving member 715 Opening movable cam as a clamp opening / closing member 720 Opening fixed cam as a clamp opening / closing member 730 Nipping fixed cam as a clamp opening / closing member 900 Second paper discharge section 1101 Third plate cylinder 1300 Second Paper feed unit

Claims (9)

[Claims] 1. After printing a stencil sheet on a plate cylinder, ink is exuded from a perforated portion of the stencil sheet, and the ink is transferred to printing paper supplied from a paper feeding section. In a stencil printing apparatus that transfers an image and discharges the printing paper to a paper discharge unit, a plurality of plate cylinders are arranged at positions facing the plurality of plate cylinders, respectively, and rotate at the same peripheral speed as each plate cylinder. A transfer cylinder provided with a clamp mechanism for sandwiching the leading end of the printing paper in the supply direction, and a plurality of paper feed units, wherein each of the plate cylinders is provided so as to be freely movable toward and away from the transfer cylinder. A stencil printing apparatus characterized in that a clamp opening / closing member that opens and closes the clamp mechanism in accordance with a printing mode is provided near the transfer cylinder. 2. The stencil printing apparatus according to claim 1, wherein said clamp opening / closing member opens and closes said clamp mechanism in accordance with a printing mode as said transfer cylinder rotates. 3. The stencil printing apparatus according to claim 1, wherein three or more plate cylinders are provided around the transfer cylinder. 4. The apparatus according to claim 1, wherein said clamp opening and closing member comprises two types of cams, a movable cam and a fixed cam, and is adapted to correspond to various printing modes by appropriately displacing said movable cam. 4. The stencil printing apparatus according to 2 or 3. 5. The clamp opening / closing member is provided at a position corresponding to one sheet feeding unit, and a position at which printing paper is held by the clamp mechanism with respect to a sheet feeding timing from the sheet feeding unit, and a position at which printing paper is not held. And a fixed cam for clamping, which is provided at a position corresponding to another sheet feeding unit and which always clamps a printing sheet with the clamp mechanism in response to a sheet feeding timing from the sheet feeding unit. A movable cam for opening, which is provided at a position corresponding to one paper discharge unit and which can selectively take a position for releasing the clamp mechanism and a position for not releasing the clamp mechanism, and provided at a position corresponding to another paper discharge unit. 4. A stencil printing apparatus according to claim 1, further comprising an opening fixed cam for always opening said clamp mechanism. 6. A driving member corresponding to each of the movable cam for holding and the movable cam for opening is provided.
6. The stencil printing apparatus according to claim 5, further comprising control means for controlling each driving member in accordance with an input of a printing mode. 7. The printing method according to claim 1, wherein the switching between the single color printing and the multi-color printing on the front and back sides of the printing paper is performed by switching the paper feeding path of the printing paper.
Or a stencil printer according to 6. 8. In one print mode, paper can be fed from a plurality of paper feed units, and after feeding from one paper feed unit, switching to another paper feed unit is performed to continuously supply the print paper. 7. The method of claim 1, 2, 3, 4, 5 or 6.
A stencil printing apparatus as described in the above. 9. A printing machine according to claim 1, wherein a plurality of plate cylinders can be fed from a plurality of feeding units, and the printing paper is continuously supplied as a whole apparatus. 7. A stencil printing apparatus according to claim 5, 5 or 6.