JP4791759B2 - Stencil printing apparatus and plate cylinder used therefor - Google Patents

Description

  The present invention relates to a stencil printing apparatus, and more particularly to a structure of a plate cylinder in which a master is wound on an outer peripheral surface.

  Conventionally, digital thermal stencil printing is known as a simple printing method. This is because a thermal head having a plurality of fine heating elements is brought into contact with a master obtained by bonding a thermoplastic resin film and a porous support, and the master is placed on a platen roller or the like while energizing the heating elements in a pulsed manner. After the perforated image based on the image information is hot-melt perforated and engraved on the thermoplastic resin film of the master by conveying with a conveying means, this perforated master is wound around a porous cylindrical plate cylinder and pressed. By pressing the paper against the outer peripheral surface of the plate cylinder by means, the ink supplied to the inner peripheral surface of the plate cylinder is oozed out from the opening portion of the plate cylinder and the master perforation portion, and printing is performed on the paper by transferring this ink to the paper. An image is obtained.

  As a master used for this stencil printing, a thin thermoplastic resin film having a thickness of about 2 to 8 μm and a porous support made of Japanese paper, synthetic fiber, or a mixture of Japanese paper and synthetic fiber are bonded together. A laminate structure is generally used. In the printing described above, the ink passes through fibers such as Japanese paper constituting the master porous support. For this reason, ink does not pass well when there are parts where the fibers are intricately entangled in the ink passage part (dama part) or when the fibers cross the perforated part of the thermoplastic resin film. However, there is a problem that a problem of so-called fiber eyes, in which a fiber pattern appears in the solid portion, a thin line is cut or faint, occurs.

  Therefore, printing is performed using a master with a thin porous support having fibers that cause fiber formation, or a master made only of a thermoplastic resin film without using a porous support, and defects due to the fiber formation are caused. Attempts have been made to reduce it. However, the apparent strength of the conventional master is borne by the porous support, and in the master consisting only of a thin porous support or a thermoplastic resin film, the thermoplastic resin film is thin, so the strength of the master (waist) Will drop significantly.

  In general, the master is supplied with a conveying force by a platen roller and a master conveying means provided on the downstream side in the master conveying direction, and is guided by a guide plate to a locking means provided on the outer peripheral surface of the plate cylinder. However, since the plate cylinder rotates, in order to avoid interference with the locking means, the master conveying means and the guide plate cannot be arranged so close to the plate cylinder. As a result, in the above-mentioned low-strength master, a slight undulation phenomenon occurs due to shrinkage during punching or film cracking before reaching the locking means from the master conveying means, and this state remains unchanged. When locked by the stopping means, there is a problem that wrinkles as shown in FIG.

  Therefore, a technique is provided in the vicinity of the outer peripheral surface of the plate cylinder to provide an extension member that applies tension to the master during winding on the plate cylinder, and the master is extended by this extension member to prevent wrinkles on the plate cylinder. For example, it is disclosed in “Patent Document 1”.

  Also, an openable / closable clamper that holds the leading end of the master on the outer peripheral surface of the plate cylinder, and the leading end of the master is separated from the outer peripheral surface of the plate cylinder when the clamper is released when the master is released from the outer peripheral surface of the plate cylinder. A stencil printing apparatus having an elastic thin plate having a kick-out claw that jumps up in the direction is disclosed in, for example, “Patent Document 2”.

JP 2004-188913 A Japanese Patent No. 3014354

  However, in the technique disclosed in “Patent Document 1”, the cost is increased by newly providing the extension member, and the operation program becomes complicated because it is necessary to consider the operation timing of the extension member. There is.

  The present invention solves the above-mentioned problems, prevents the occurrence of wrinkles on the master during winding while using existing members, and provides a stencil printing apparatus capable of obtaining a good printed matter without increasing costs. For the purpose of provision.

The invention according to claim 1 is an openable / closable clamper that sandwiches the master, and a plate removal assist that swings in conjunction with the clamper when the clamper is released and pushes the master sandwiched by the clamper in a direction away from the clamper. in the plate cylinder of the stencil printing device having a member, the plate discharge assisting member, its one end said said clamper when the clamper Gama static sandwiched wound operation of the master is performed on the opposite side The master to be wound is in contact with the entire width of the master, and the contact portion of the one end with the master has a shape in which both end portions protrude from the central portion.

  According to a second aspect of the present invention, in the plate cylinder of the stencil printing apparatus according to the first aspect, the one end is arcuate.

  According to a third aspect of the present invention, in the plate cylinder of the stencil printing apparatus according to the first or second aspect, the one end is flexible.

  A fourth aspect of the present invention is a stencil printing apparatus having the plate cylinder according to any one of the first to third aspects.

  According to the present invention, one end of the plate discharging auxiliary member is brought into contact with the entire width of the master, and the shape of the one end is formed such that both ends protrude compared to the central portion. Since this tension causes the master to be satisfactorily wound on the outer peripheral surface of the plate cylinder without generating wrinkles at the center thereof, a good printed matter can be obtained without increasing costs.

  FIG. 1 shows a stencil printing apparatus that employs a first embodiment of the present invention. In FIG. 1, a stencil printing apparatus 1 includes a printing unit 2, a plate making unit 3, a paper feeding unit 4, a plate discharging unit 5, a paper discharging unit 6, an image reading unit 7, and the like.

The printing unit 2 disposed almost at the center of the apparatus main body 8 includes a plate cylinder 9 and a press roller 10.
The plate cylinder 9 is rotatably supported by a support shaft 11 that also serves as an ink supply pipe. The plate cylinder 9 is rotatably driven by a plate cylinder driving means (not shown) and is detachable from the apparatus main body 8. An ink supply means 14 having an ink roller 12, a doctor roller 13, etc. is disposed inside the plate cylinder 9, and an ink reservoir having a wedge-shaped cross section formed in the vicinity of the ink roller 12 and the doctor roller 13. Fifteen inks are supplied to the inner peripheral surface of the plate cylinder 9.

  As shown in FIG. 2, the plate cylinder 9 has a stage portion 16 on a part of its outer peripheral surface, and a bracket 17 is attached on the stage portion 16. A support shaft 18 a of a clamper 18 is rotatably attached to the bracket 17, and the clamper 18 is provided so as to be openable and closable with respect to the stage portion 16. A clamper base 19 is provided between the clamper 18 and the stage unit 16, and the clamper 18 and the clamper base 19 are configured to be magnetically attached to each other. The clamper 18 is opened and closed by an opening / closing means (not shown) when the plate cylinder 9 occupies the discharge position and the supply position, and the opening angle is similar to the technique described in Japanese Patent No. 3014354 as compared with the supply position. The position is configured to be larger. Further, in the vicinity of the free end of the clamper 18, similarly to the technique described in Japanese Patent No. 3014354, a projecting piece (not shown) is provided.

  A bracket 20 is provided on the side of the clamper base 19 that faces the support shaft 18a. A support shaft 21a is rotatably attached to the bracket 20, and an elastic thin plate 21 as a plate removal auxiliary member is integrally attached to the support shaft 21a. The elastic thin plate 21 made of a metal plate having a thickness of about 0.5 to 0.8 mm has one end 21b protruding leftward in FIG. 2 from the support shaft 21a, and the other end 21c described in Japanese Patent No. 3014354. Similar to the technique, a comb-like kick-out claw in a plan view is formed by pushing the tip of the master 29 sandwiched between the clamper 18 and the clamper base 19 upward in FIG. The clamper base 19 has a recess 19a corresponding to the shape of the other end 21c.

  As shown in FIG. 3, the elastic thin plate 21 has a projecting piece 21d that engages with a projecting piece (not shown) provided on the clamper 18 on one side of the other end 21c. When the projection 21d is opened, the projection 21d is lifted to the near side in FIG. 3 so that each other end 21c rotates about the support shaft 21a in the counterclockwise direction in FIG. The tip of the master 29 is pushed away from the clamper 18 and the clamper base 19. As shown in FIG. 3, the one end 21 b protrudes to the left in FIG. 2 with respect to the center portion, and has a width X of 20 to 80 mm and a protrusion amount Y from the recess of 0.2 to 0.2 mm. It is formed to be about 3 mm. As described above, the opening angle of the clamper 18 at the plate feeding position is smaller than that at the plate discharging position. When the clamper 18 is opened at the plate feeding position, the protruding piece 21d does not move, and the elastic thin plate 21 is shown in FIG. The position shown in is maintained.

  Below the plate cylinder 9 is disposed a press roller 10 in which both ends of the support shaft are rotatably supported by a pair of arm members 22. The press roller 10 is swung by a swinging means (not shown) so that the press roller 10 is separated from the outer peripheral surface of the plate cylinder 9 shown in FIG. It selectively occupies the press-contact position pressed by force.

A plate making unit 3 is disposed in the upper right part of the apparatus main body 8. The plate making unit 3 includes a master holding member 23, a platen roller 24, a thermal head 25, a master cutting means 26, a master conveying roller pair 27, 28, and the like.
The master holding member 23 is attached to a side plate (not shown) of the apparatus main body 8 and rotates a core portion of a master roll 29a obtained by winding a master 29 formed by laminating a thermoplastic resin film and a porous support in a roll shape. Support freely and detachable.

  A platen roller 24 disposed on the left side of the master holding member 23 is rotatably supported on a side plate (not shown) of the apparatus body 8 and is driven to rotate by a stepping motor 30. A thermal head 25 having a large number of heat generating elements located below the platen roller 24 is attached to a side plate (not shown) of the apparatus body 8, and the surface of the heat generating element is arranged around the platen roller 24 by a biasing force of a biasing means (not shown). It is pressed against the surface. The thermal head 25 selectively heats each heating element while contacting the surface of the thermoplastic resin film of the master 29, and performs hot melt perforation plate-making on the master 29.

  Master cutting means 26 is disposed on the left side of the platen roller 24 and the thermal head 25. The master cutting means 26 having a fixed blade fixed to a frame (not shown) of the apparatus main body 8 and a movable blade supported so as to be movable with respect to the fixed blade has the movable blade rotated or moved with respect to the fixed blade. The master 29 is cut by moving up and down.

  On the left side of the master cutting means 26, a master transport roller pair 27, 28 is disposed. Each of the master conveying roller pairs 27 and 28 has a driving roller and a driven roller that are rotatably supported by a side plate (not shown) of the apparatus main body 8, and each driving roller is a platen roller 24 by driving means (not shown). The driven rollers are rotationally driven in the same direction in synchronism with each other, and the driven rollers are pressed against the corresponding driving rollers by urging means (not shown).

A sheet feeding unit 4 is disposed below the plate making unit 3. The paper feed unit 4 includes a paper feed tray 31, a paper feed roller 32, a separation roller pair 33, a registration roller pair 34, and the like.
A paper feed tray 31 on which a large number of sheets P can be stacked on the upper surface is supported by the apparatus main body 8 so as to be movable up and down, and is moved up and down by lifting means (not shown). A pair of side fences 35 are disposed on the upper surface of the paper feed tray 31, and each side fence 35 is configured to be able to contact and separate in synchronization with each other by a known rack and pinion mechanism.

  A paper feed roller 32 having a high friction resistance member on the surface is disposed above the left end of the paper feed tray 31. The paper feed roller 32 is rotatably supported by a bracket (not shown) that is swingably supported by the apparatus body 8, and the uppermost position on the paper feed tray 31 with a predetermined pressing force when the paper feed tray 31 is raised. The sheet P. The paper feed roller 32 is rotationally driven by a stepping motor 36.

  A separation roller pair 33 is disposed on the left side of the paper feed roller 32. The separation roller pair 33 has an upper roller and a lower roller each having a high friction resistance member on the surface, and the upper roller is rotated in the same direction in synchronization with the feeding roller 32 by the stepping motor 36. Driven. The lower roller is pressed against the upper roller with a predetermined pressing force by a biasing force of a biasing means (not shown), and is configured to be rotatable only in the same direction as the upper roller.

  On the left side of the separation roller pair 33, a registration roller pair 34 having a driving roller 34a and a driven roller 34b is disposed. The driving roller 34a is rotatably supported between side plates (not shown) of the apparatus main body 8, and a rotational driving force from a plate cylinder driving means (not shown) is transmitted through a driving force transmission means (not shown), thereby the plate cylinder. 9 is driven in rotation. The driven roller 34b is rotatably supported between side plates (not shown) of the apparatus body 8, and is pressed against the drive roller 34a with a predetermined pressing force by a biasing force of a biasing means (not shown).

A plate discharging unit 5 is disposed on the upper left side of the printing unit 2. The plate removal unit 5 includes an upper plate removal member 37, a lower plate removal member 38, a plate removal box 39, a compression plate 40, and the like.
Each of the upper plate removing member 37 and the lower plate discharging member 38 has a driving roller, a driven roller, an endless belt, and the like. Further, the lower plate discharging member 38 is configured to be movable by a moving means (not shown), and selectively occupies the initial position shown in the drawing and the peeling position where the endless belt contacts the outer peripheral surface of the plate cylinder 9.

  A plate removal box 39 for storing a used master therein is configured to be detachable from the apparatus main body 8. A compression plate 40 that pushes the used master carried by the upper plate release member 37 and the lower plate release member 38 into the plate release box 39 is supported by the apparatus main body 8 so as to be movable up and down, and is moved up and down by lifting means (not shown). The

A paper discharge unit 6 is disposed below the plate discharge unit 5. The paper discharge unit 6 includes a peeling claw 41, a paper transport unit 42, a paper discharge tray 43, and the like.
The base end of the peeling claw 41 is swingably supported by the apparatus main body 8 and is swung by a claw swinging means (not shown) so that the free end formed in an acute angle is the outer periphery of the plate cylinder 9. The proximity position shown in the drawing close to the surface and the separation position separated from the outer peripheral surface of the plate cylinder 9 to avoid obstacles such as the clamper 18 are selectively occupied.

  The sheet conveying means 42 disposed on the lower left side of the peeling claw 41 has a driving roller, a driven roller, an endless belt, a suction fan, and the like. The paper conveying means 42 is configured to remove the printed paper P peeled off from the outer peripheral surface of the plate cylinder 9 by the peeling claw 41 when the driving roller is rotated by a paper discharge driving means (not shown) and the suction fan is operated. Conveys to the left while sucking on the endless belt.

  A paper discharge tray 43 is disposed on the left side of the paper conveying means 42. A paper discharge tray 43 on which a large number of printed paper P transported by the paper transport means 42 is stacked has one end fence 44 and a pair of side fences 45 for aligning the paper P on the upper surface thereof. ing. The end fence 44 is movable in the same direction as the paper transport direction, and the side fences 45 are configured to be able to contact and separate from each other in the same direction as the paper width direction.

  An image reading unit 7 is disposed on the upper part of the apparatus main body 8. The image reading unit 7 includes a contact glass 46 on which a document is placed, a pressure plate 47 that can be moved toward and away from the contact glass 46, a scanning unit 48 that scans and reads a document image, a lens 49 that focuses the scanned image, and a focus. And an image sensor 50 such as a CCD for processing the processed image. An ADF unit 51 used for automatically and continuously reading a plurality of originals is disposed above the pressure plate 47.

  Inside the apparatus main body 8, a control means 52 comprising a well-known microcomputer having a CPU, a ROM, a RAM and the like is disposed. An operation signal from an operation panel (not shown) provided on the upper front surface of the apparatus main body 8 and detection signals from various sensors are input to the control means 52. The control means 52 receives the printing unit 2 and the plate making based on each signal. The operations of the unit 3, the sheet feeding unit 4, the plate discharging unit 5, the sheet discharging unit 6, and the image reading unit 7 are controlled.

Based on the above configuration, the operation of the stencil printing apparatus 1 will be described below.
After an original is placed on the contact glass 46 by the operator, when a plate making start key (not shown) on the operation panel is pressed with the pressure plate 47 closed, the image reading unit 7 reads the original image. . The image is read by scanning the document image with the scanning unit 48, and the read image is focused by the lens 49 and then sent to the image sensor 50.

  In parallel with the image reading operation, the plate discharging unit 5 performs a plate discharging operation for peeling the used master from the outer peripheral surface of the plate cylinder 9. When the plate making start key is pressed, the plate cylinder 9 starts to rotate, and when the plate cylinder 9 reaches a predetermined plate discharging position, the rotation is stopped. Thereafter, an opening / closing means (not shown) is operated to open the clamper 18. When the clamper 18 is opened, the elastic thin plate 21 is rotated, whereby the tip of the used master is pushed away from the clamper 18 and the clamper base 19. Then, the lower plate discharging member 38 is actuated and moved to the peeling position. After the used master on the plate cylinder 9 is scooped up by the lower plate discharging member 38, the plate cylinder 9 is driven to rotate and the upper plate discharging member 37 is moved. In operation, the used master on the plate cylinder 9 is transported by the plate discharging members 37 and 38 and stored in the plate discharging box 39. Thereafter, the compression plate 40 is actuated to compress the used master in the discharge plate box 39, and the plate cylinder 9 is rotated to a predetermined plate feeding position and stopped, and the clamper 18 is opened at a predetermined angle smaller than that at the time of discharge. As a result, the stencil printing apparatus 1 enters a stencil standby state.

  When the stencil printing apparatus 1 enters the plate feeding standby state, the platen roller 24 and each of the master transport roller pairs 27 and 28 are driven to rotate, and the master 29 is pulled out from the master roll 29a. The drawn master 29 is perforated according to the image data when passing through the thermal head 25, and a plate-making image is formed on the surface of the thermoplastic resin film. The master 29 is sent to the clamper 18 while making a plate, and when the control means 52 determines that the tip of the master 29 has been conveyed to a position that can be held by the clamper 18 based on the number of steps of the stepping motor 30, the clamper 18 is closed and the plate is made. The leading end of the master 29 is held on the outer peripheral surface of the plate cylinder 9.

  Thereafter, the plate cylinder 9 is rotationally driven at the same peripheral speed as the conveying speed of the master 29, and the winding operation of the master 29 around the plate cylinder 9 is performed. During this winding operation, the master 29 having its tip end sandwiched between the clamper 18 and the clamper base 19 is wound on the outer peripheral surface of the plate cylinder 9 while contacting the one end 21b as shown in FIG. . At this time, since one end 21b has a shape in which both end portions protrude as compared with the central portion as shown in FIG. 3, a tension A acts on both side edges of the master 29 as shown in FIG. As a result, the master 29 is satisfactorily wound on the outer peripheral surface of the plate cylinder 9 without generating wrinkles as shown in FIG.

  When the master 28 for one plate is made, the operations of the platen roller 24 and each of the master transport roller pairs 27 and 28 are stopped and the master cutting means 26 is operated to cut the master 29. The cut master 29 is pulled out from the plate making unit 3 by the rotation of the plate cylinder 9, and the plate cylinder 9 rotates to the home position and stops, whereby the plate making operation and the plate feeding operation are completed.

  When the plate feeding operation is completed, the plate cylinder 9 starts to rotate in the clockwise direction in FIG. 1 at a low speed, and the sheet feeding unit 4 operates to pull out the uppermost sheet P from the sheet feeding tray 31. It is. After the drawn paper P is temporarily stopped by the registration roller pair 34, the image area leading end in the plate cylinder rotation direction of the master 29 wound around the plate cylinder 9 reaches a contact portion with the press roller 10. When the drive roller 34a is rotationally driven at the timing, it is fed toward the contact portion between the plate cylinder 9 and the press roller 10.

  Almost simultaneously with the rotation of the drive roller 34a, the press roller 10 occupies the pressure contact position by the operation of the swinging means (not shown), and the fed paper P is pressed against the master 29 on the plate cylinder 9. By this pressing operation, the press roller 10, the paper P, the master 29, and the plate cylinder 9 are pressed against each other, and the ink supplied to the inner peripheral surface of the plate cylinder 9 by the ink roller 12 oozes out from a plate cylinder opening portion (not shown). After the porous support of the master 29 is filled, it is transferred to the paper P through the perforated portion of the master 29, and so-called printing is performed.

  The sheet P on which the image has been transferred by printing is peeled off from the outer peripheral surface of the plate cylinder 9 by the peeling claw 41, dropped downward and sent to the sheet conveying means 42, and then sucked and conveyed by the sheet conveying means 42. Then, the paper is discharged onto the paper discharge tray 43. Thereafter, the plate cylinder 9 rotates again to the home position and stops, and the stencil printing apparatus 1 enters a printing standby state after finishing the plate attaching operation.

  After the stencil printing apparatus 1 is in a printing standby state, when a printing condition is input by a key on an operation panel (not shown) and then a test printing key (not shown) is pressed, the printing cylinder 9 is set in accordance with the set printing speed. At the same time, the sheet P is rotated and fed, and only one sheet P is fed from the sheet feeding unit 4, and a test printing is performed in the same manner as in the plate printing. When the image position, image density, and the like are confirmed by trial printing and the print start key (not shown) is pressed after the number of prints is set on the operation panel (not shown), the paper P is continuously fed from the paper supply unit 4. Then, the printing operation is performed in the same manner as in the trial printing. When the set number of prints is consumed, the plate cylinder 9 stops at the home position, and the stencil printing apparatus 1 enters the print standby state again.

  With the above-described configuration, when the master 29 is wound on the plate cylinder 9, the one end 21b of the elastic thin plate 21 is in contact with the entire width of the master 29, and the shape of the both ends protrudes from the center portion. Therefore, when the tension A acts on both side edge portions of the master 29, the master 29 is satisfactorily wound on the outer peripheral surface of the plate cylinder 9 without generating wrinkles, and this increases costs by using existing members. It is possible to obtain a good printed matter without doing so.

  FIG. 6 shows an elastic thin plate 53 as a plate discharge auxiliary member used in the second embodiment of the present invention, and FIG. 7 shows an elastic thin plate 54 as a plate discharge auxiliary member used in the third embodiment of the present invention. Yes.

  The elastic thin plate 53 made of a metal plate having a thickness of about 0.5 to 0.8 mm integrally has a support shaft 53a that is rotatably supported by the bracket 20, and is formed in an arc shape having a radius of about 800 to 1200 mm. The one end 53 b is projected to the same extent as the one end 21 b of the elastic thin plate 21. The other end 53c is formed with a comb-like kick-out claw in a plan view, and a projecting piece 53d that engages with a projecting piece (not shown) provided on the clamper 18 is formed on one side of the other end 53c. ing.

  The elastic thin plate 54 made of a metal plate having a thickness of about 0.5 to 0.8 mm integrally has a support shaft 54a that is rotatably supported by the bracket 20, and has one end 54b and the other end 54c. Yes. The other end 54c is formed with a comb-like kick-out claw in plan view, and a projecting piece 54d that engages with a projecting piece (not shown) provided on the clamper 18 is formed on one side of the other end 54c. ing. Protrusions are formed at both ends of the one end 54b, and the width X1 is 20 to 80 mm and the protrusion Y1 is about 2 to 10 mm. Each protrusion is welded to an elastic metal thin plate having a thickness of about 0.2 to 0.4 mm, or an elastic resin plate such as Mylar having a thickness of about 0.1 to 1 mm is attached, and a rubber having a thickness of about 1 to 2 mm. It is formed by sticking a board etc., and the structure which has each flexibility is employ | adopted.

  Even if the elastic thin plate 53 or the elastic thin plate 54 described above is used, the tension A can be applied to both side edges of the master 29 by bringing the one ends 53b and 54b into contact with each other over the entire width of the master 29. The same effect as the form can be obtained. Further, in the elastic thin plate 54, the protruding portion at one end 54b has flexibility, so that even when the master 29 is weak, it can follow the movement of the master 29. The effect of preventing the generation of wrinkles can be improved.

1 is a schematic front view of a stencil printing apparatus to which each of the first to third embodiments of the present invention can be applied. It is the schematic of the plate cylinder principal part used for the 1st Embodiment of this invention. It is the schematic of the elastic thin plate used for the 1st Embodiment of this invention. It is the schematic for demonstrating the effect | action of the elastic thin plate at the time of the winding operation | movement in the 1st Embodiment of this invention. It is the schematic for demonstrating the tension | tensile_strength acted on a master by the elastic thin plate in the 1st Embodiment of this invention. It is the schematic of the elastic thin plate used for the 2nd Embodiment of this invention. It is the schematic of the elastic thin plate used for the 3rd Embodiment of this invention. It is the schematic for demonstrating the conventional problem.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Stencil printing apparatus 9 Plate cylinder 18 Clamper 21, 53, 54 Ejection plate auxiliary member (elastic thin plate)
21b, 53b, 54b One end 29 Master

Claims (4)

A stencil printing apparatus comprising: a freely openable / closable clamper that sandwiches a master; and a plate discharge auxiliary member that swings in conjunction with the clamper when the clamper is opened and pushes the master sandwiched by the clamper in a direction away from the clamper. In the plate cylinder,
Said plate discharge auxiliary member is in contact over the master and the entire width of the master having one end located on the opposite side is wound around said clamper when the winding operation of the master is performed by sandwiching the damper Gama Star The plate cylinder of the stencil printing apparatus is characterized in that the contact portion of the one end with the master has a shape in which both end portions protrude from the central portion. In the plate cylinder of the stencil printing apparatus according to claim 1,
A plate cylinder of a stencil printing apparatus, wherein the one end is arcuate. In the plate cylinder of the stencil printing apparatus according to claim 1 or 2,
The plate cylinder of the stencil printing apparatus, wherein the one end is flexible.   A stencil printing apparatus comprising the plate cylinder according to any one of claims 1 to 3.

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