JP2016198978A - Stencil printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent ink and an oil component of ink reached to the tip side of Japanese paper of stencil paper from entering a gap between a tip upper surface side of a resin film of the stencil paper and a clamp surface of a clamp plate.SOLUTION: In a stencil printer 1 comprising: a plate attachment pedestal 66 which is fixedly installed along an axial direction of a plate cylinder 61 in a portion of an outer peripheral surface 61a of the plate cylinder 61; a clamp plate 67 which is supported openably/closably so as to face the plate attachment pedestal 66, and clamps a tip Ma side of engraved stencil paper M by closing at the time of plate-making; and at least clamp plate opening/closing means 40 which opens/closes the clamp plate 67, clamping the tip Ma side of the stencil paper M between the plate attachment pedestal 66 side and the clamp plate 67 side and winding the stencil paper M to the outer peripheral surface 61a of the plate cylinder 61, at least one of the plate attachment pedestal 66 side and the clamp plate 67 side is not brought into contact with the leading-edge portion of the tip Ma side of the stencil paper M at the time of clamping of the stencil paper M.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a stencil configured to clamp the leading end side of a stencil sheet that has been subjected to stenciling between a stencil mounting pedestal side provided on a part of the outer periphery of the stencil cylinder and a clamp surface side of an openable / closable clamp plate. The present invention relates to a printing apparatus.

  Generally, a stencil printing apparatus is used to make a stencil sheet that has been stenciled between a plate mounting base provided on a part of the outer peripheral surface of a rotatable plate cylinder (drum) and a clamp surface side of a clamp plate that can be opened and closed. The stencil sheet is wound along the outer peripheral surface of the plate cylinder by clamping the front end side.

  A perforated image portion in which the ink supplied into the plate cylinder is thermally perforated on the stencil base paper while pressing the paper fed from the paper feeding section to the stencil base side with a press roller provided so as to be able to contact and separate from the plate cylinder The image corresponding to the perforated image portion of the stencil sheet is printed on the paper, and then the printed paper is peeled off from the plate cylinder side by a peeling claw placed close to the plate cylinder and discharged. By discharging to the center, a large number of identical images can be printed with one stencil sheet, which is often used.

  In an example of this type of stencil printing apparatus, a stencil in which a plurality of grooves are provided in a stage portion (plate mounting base) fixed to the outer peripheral surface of a cylindrical plate cylinder corresponding to the sandwiching portion of a master (stencil paper). There is a printing apparatus (see, for example, Patent Document 1).

  In the example stencil printing apparatus disclosed in Patent Document 1, although illustration is omitted here, a master on which a perforated image portion is formed is mounted on a rotatable plate cylinder, and bleeding from the inside of the plate cylinder to the outer peripheral surface is performed. The stencil printing apparatus is configured to perform printing by transferring the ink that has been ejected and passed through the perforated image portion of the master onto the printing paper.

  In this example stencil printing apparatus, a stage unit fixed to the outer peripheral surface of a cylindrical plate cylinder, a clamper unit having an openable / closable clamp plate for clamping (clamping) a master between the stage unit, and a stage unit And a plurality of groove portions that are provided in the sandwiching portion of the master and reach the side portion of the stage portion.

  As a result, even if the ink or the oil component of the ink from the plate cylinder is transmitted to the stage portion through the master, the ink or the oil component of the ink is discharged through a plurality of groove portions provided in the stage portion. Therefore, it is possible to prevent the master from sticking to the stage portion, sticking, catching, and the like.

  Further, as another example of the stencil printing apparatus, the applicant of the present application is able to open and close a clamp plate that clamps the front end portion of the stencil sheet that has been made at the time of plate-making to the plate cylinder side, and the front end of the stencil sheet that has been used at the time of discharging the plate. A stencil printing apparatus in which an openable and closable flip-up plate that flips the part side from the plate cylinder side is integrally attached to a part of the outer peripheral surface of the plate cylinder has been proposed (for example, see Patent Document 2).

JP 2002-137520 A JP, 2014-213520, A

  By the way, in the stencil printing apparatus of the example described in Patent Document 1, as described above, by providing a plurality of groove portions corresponding to the sandwiching portion of the master (stencil sheet) on the stage portion fixed to the plate cylinder, When the master is sandwiched (clamped) between the stage part and the clamp plate of the clamper part, it is possible to prevent the master from sticking closely to the stage part.

  However, when a plurality of groove portions are formed in the stage portion, the land portion formed in a convex shape between adjacent groove portions on the stage portion becomes a sandwiching portion of the master that sandwiches the master. Accordingly, since the contact area of the sandwiched portion of the master by the plurality of land portions decreases, the shearing force per unit area of the sandwiched portion of the master increases, and the master is easily broken by the plurality of land portions during printing. This is a problem because a phenomenon occurs. Further, as described below, no countermeasure is taken against the phenomenon that the master sticks to the clamp plate of the clamper portion.

  On the other hand, in the stencil printing apparatus of the other example described in Patent Document 2, as described above, the stencil sheet can be spun up from the plate cylinder side by the flip-up plate at the leading end side of the used stencil sheet at the time of discharging. There is a phenomenon that the tip end side of the stencil sticks to the clamp surface of the clamp plate, and the used stencil sheet may not be discharged.

  The reason for this will be described with reference to FIG. 7. Generally, a stencil sheet is pasted by superposing a resin film and a porous Japanese paper. Then, between the plate mounting base (or a magnetic plate (not shown) mounted on the plate mounting base) in which the leading end side of the stencil sheet is fixed to a part of the outer peripheral surface of the plate cylinder, and the clamp surface of the clamp plate When clamping (clamping), the Japanese paper side of the stencil sheet is opposed to the plate mounting base side, and this Japanese paper side is wound along the outer peripheral surface of the plate cylinder, while the resin film side of the stencil sheet is clamped by the clamp plate It faces the surface side.

  At this time, the ink adhering to the stencil sheet and the oil component of the ink are transmitted to the leading end side of the stencil sheet by capillary action, and accordingly, the ink and ink oil transmitted to the leading end side of the stencil sheet. Ink adheres to the clamp surface of the clamp plate because the component wraps around between the upper surface of the front end of the resin film and the clamp surface of the clamp plate, and the stencil sheet is adhered to the clamp surface of the clamp plate by the adhered ink. As a result, the stencil sheet used at the time of stencil discharge cannot be normally discharged.

  In view of this, the present invention provides a stencil sheet with a resin film and Japanese paper pasted on the front end side of the stencil plate provided on a part of the outer periphery of the plate cylinder and the clamp surface side of the clamp plate that can be opened and closed. Providing a stencil printing device configured so that the ink and the oil component of the ink transmitted to the stencil sheet's leading edge side do not wrap around between the top surface of the stencil sheet's leading edge and the clamping surface of the clamp plate when clamping with The purpose is to do.

The present invention has been made in view of the above problems, and the first invention includes a plate cylinder having a cylindrical outer peripheral surface and rotating about a central axis,
A plate mounting base fixedly installed along the axial direction of the plate cylinder on a part of the outer peripheral surface of the plate cylinder;
A clamp plate having a clamping surface that is supported so as to be openable and closable facing the plate mounting base, and that is closed at the time of plate-making and clamps the leading end side of the stencil sheet that has been made.
A clamping plate opening and closing means for opening and closing the clamping plate,
A stencil printing apparatus configured to clamp the front end side of the stencil sheet between the stencil mounting base side and the clamp surface side of the clamp plate and wind the stencil sheet around the outer peripheral surface of the plate cylinder. In
Stencil printing characterized in that at the time of clamping the stencil sheet, at least one of the stencil mounting base side and the clamp surface side of the clamp plate is not in contact with the most advanced part of the front end side of the stencil sheet. Device.

Moreover, 2nd invention is further equipped with the conveyance part which conveys the said stencil paper to the said clamp plate in the structure of said 1st invention,
The transport unit is configured so that, when the stencil sheet is clamped, at least one of the stencil mounting base side and the clamp surface side of the clamp plate does not come into contact with the most advanced portion of the stencil sheet front end side. Is a stencil printing apparatus.

Further, a third invention is the configuration of the first or second invention described above,
In the stencil printing apparatus, at least one of the plate mounting base and the clamp plate has a shape that does not come into contact with the most distal portion of the stencil sheet at the leading end side when the stencil sheet is clamped.

  According to the stencil printing apparatus of the first to third inventions, when clamping the front end side of the stencil sheet between the plate mounting base side and the clamping surface side of the clamping plate, the plate mounting base side and the clamping surface of the clamping plate At least one of the sides is configured not to contact the most advanced portion of the front end portion side of the stencil sheet.

  As a result, the ink or the oil component of the ink transmitted to the foremost part of the stencil sheet tip does not wrap around between the top surface of the stencil sheet top and the clamp surface of the clamp plate. Since the upper surface side of the part can be prevented from sticking to the clamp surface of the clamp plate, the plate discharging operation can be reliably performed on the used stencil sheet.

1 is an overall configuration diagram showing an overall configuration of a stencil printing apparatus according to the present invention. FIG. 2 is an enlarged side view of the first embodiment of the stencil sheet clamping unit shown in FIG. 1 in the stencil printing apparatus according to the present invention. FIG. 5 is an enlarged side view showing a second embodiment of the stencil sheet clamping unit shown in FIG. 1 in the stencil printing apparatus according to the present invention. FIG. 5 is an enlarged side view showing a third embodiment of the stencil sheet clamping unit shown in FIG. 1 in the stencil printing apparatus according to the present invention. (A)-(f) typically shows the 1st-6th form of the stencil sheet clamp part of 1st Embodiment (or the stencil sheet clamp part of 2nd Embodiment) of the measure for preventing the ink / ink oil component wraparound. FIG. (A)-(f) is the figure which showed typically the 1st-6th form of the stencil paper clamp part of 3rd Embodiment of the ink / ink oil component wraparound prevention measure. In other conventional stencil printing apparatuses, ink or an oil component of ink occurs between the top surface of the resin film on the stencil sheet to which the resin film and Japanese paper are bonded and the clamp surface of the clamp plate. It is the figure which showed the state typically.

  Hereinafter, an embodiment of a stencil printing apparatus according to the present invention will be described in detail with reference to FIGS.

  FIG. 1 shows the overall configuration of a stencil printing apparatus according to the present invention.

  As shown in FIG. 1, in the stencil printing apparatus 1 according to the present invention, an apparatus housing 2 that forms the appearance of the apparatus 1 is formed in a box shape.

  The stencil printing apparatus 1 described above includes an operation panel unit 10 for operating the apparatus 1, a document reading unit 20 for reading a document G on which image information such as images and characters is described, and a document G read by the document reading unit 20. On the outer peripheral surface 61a of the plate cylinder 61 of the printing cylinder 60, which will be described later, and a plate making section 30 for making a stencil base paper (also referred to as a master) M for one plate based on the image information of the printing apparatus 60 (not shown). A cam drive unit 40 that opens and closes a clamp plate 67 in a stencil sheet clamp unit 65 provided in a part, a paper feed unit 50 that feeds unprinted paper P one by one, and an outer periphery of a rotatable plate cylinder 61 A printing unit 60 for printing unprinted paper P by winding a stencil sheet M for one plate on a surface 61a via a clamp plate 67, a paper discharge unit 80 for discharging printed paper P, and a plate cylinder The used stencil sheet M peeled from the 61 side is discharged. A plate discharge unit 90 which is schematically constituted by a control unit 95 that performs overall control of the printer 1.

  Here, each part in the stencil printing apparatus 1 will be specifically described in order.

  First, the operation panel unit 10 is installed on the left side (or front surface) of the top surface 2 a of the apparatus housing 2. Although not shown in detail, the operation panel unit 10 includes various function buttons for performing a print job, a numeric keypad, a liquid crystal display panel, and the like.

  In the operation panel unit 10, the user operates each unit by operating various function buttons.

  Next, the document reading unit 20 is installed on the top surface 2 a of the apparatus housing 2. The document reading unit 20 includes a document table 21 on which a document G on which image information is described, a light reflection type sensor 22 that detects the presence or absence of the document G, a plurality of document conveyance roller pairs 23, and a document G. A CCD image sensor 24 for reading the image information and a document discharge table 25 are provided.

  In the document reading unit 20, the image information of the document G is read by the CCD image sensor 24 while the document G is fed by the plurality of document conveying roller pairs 23, and then the read image information is sent to the plate making unit 30.

  Next, the plate making unit 30 is installed at an upper right portion in the apparatus housing 2. The plate making unit 30 includes a base paper storage unit 31 that stores a stencil base paper (master) M that is wound in a roll shape and overlaid and adhered with a resin film and a Japanese paper made of a porous material. Also, a thermal head 32 that is arranged downstream and thermally pierces the stencil sheet M, a platen roller 34 that is opposed to the thermal head 32 and is rotatably arranged by a platen motor 33, and more than the thermal head 32 and the platen roller 34. A base paper feed roll pair 35 disposed downstream and a base paper cutter pair 36 disposed downstream of the base paper feed roll pair 35 are provided.

  In the plate making unit 30, downstream of the base paper cutter pair 36, a transport unit having a plurality of transport roller pairs and the like for transporting the stencil stencil M that has been subjected to plate making toward the plate cylinder 61 in the printing unit 60 is provided. However, illustration of the conveyance part here is abbreviate | omitted for convenience of illustration.

  In the plate making unit 30, the thermal head 32 and the platen roller 34 sandwich and convey the stencil sheet M, and based on the image information read by the document reading unit 20 on the resin film of the stencil sheet M by the thermal head 32. A perforated image portion (not shown) is thermally perforated.

  The perforated image portion may be thermally perforated on the stencil sheet M based on image information from a personal computer (not shown).

  Thereafter, the stencil sheet M in which the perforated image portion is thermally perforated is cut into a size corresponding to, for example, an A3 size (420 mm × 297 mm) sheet P having a maximum size by the pair of stencil cutters 36, and a stencil sheet for one plate. After the M is made, the stencil sheet M that has been made is conveyed toward the plate cylinder 61 in the printing unit 60 through a conveyance unit (not shown).

Next, although detailed illustration is omitted here, the cam drive unit 40 is installed close to the upper part of the plate cylinder 61 in the printing unit 60 and the downstream of the plate making unit 30, and the stencil plate for one plate. When the base paper M is placed on the plate cylinder 61, a cam (not shown) for opening the clamp plate 67 in the stencil paper clamp portion 65 provided on a part of the outer peripheral surface 61a of the plate cylinder 61 is driven. . Therefore, the cam drive unit 40 functions as a clamp plate opening / closing means for opening and closing the clamp plate 67.
Next, the paper feed unit 50 is installed on the left side surface 2 b side of the apparatus housing 2. The paper feed unit 50 rotates a plate cylinder motor 63 (to be described later) in a gear train to feed a plurality of unprinted paper sheets P to a paper feed base 51 and paper P stacked on the paper feed base 51. The sheet feeding roller 54 and the separating roller 55 which are decelerated by the sheet feeding direction 53 and rotated in the sheet feeding direction, the separating plate 56 which is disposed to face the separating roller 55, and the downstream side of the separating roller 55 and the separating plate 56. And a registration roller pair 57.

  In the paper feeding unit 50, the paper P of the uppermost layer among the plurality of papers P stacked on the paper feed tray 51 is pressed against the uppermost paper P while being rotated, and the upper paper P is taken out.

  Thereafter, the paper P taken out by the paper feeding roller 54 is separated one by one when being nipped and conveyed between the paper roller 55 and the paper plate 56, and is fed toward the downstream registration roller pair 57. Has been. Here, the registration roller pair 57 corrects the skew of the paper P by abutting the paper P while the rotation is stopped to form a loop, and then rotates at a predetermined timing to print the paper P downstream. Sent to department 60.

  Next, the printing unit 60 is installed at a substantially central portion in the apparatus housing 2. In this printing unit 60, the plate cylinder 61 is formed in a cylindrical shape with an outer diameter φD of about 180 mm corresponding to a length dimension 420 mm of an A3 size paper P, for example, and the short direction of the A3 size paper P The axial direction is formed to be long corresponding to the dimension 297 mm.

  The plate cylinder 61 is rotationally driven by the plate cylinder motor 63 around the center shaft 62 at a speed of one rotation (10 rpm) in 6 seconds in the illustrated counterclockwise direction.

  An ink insertion opening 62a for inserting the ink IK is formed on one end surface side of the center shaft 62 of the plate cylinder 61, and the ink IK supplied into the plate cylinder 61 has a porous plate cylinder. 61 oozes out from the outer peripheral surface 61a of the stencil sheet 61 toward the stencil sheet M.

  The plate cylinder motor 63 described above is a geared motor with a built-in reduction gear. An encoder 64 is attached to a rear end shaft portion (not shown) of the plate cylinder motor 63, and the plate cylinder 61 is rotated by the encoder 64. Pulses indicating the rotation angle at this time are sequentially output.

  Further, a stencil sheet clamp portion 65 for clamping the front end side of the stencil sheet M is provided on a part of the outer peripheral surface 61a of the plate cylinder 61, and this stencil sheet clamp unit 65 constitutes a main part of the present invention. It is a member to do.

  The stencil sheet clamping unit 65 described above can be opened and closed to clamp a stencil sheet M for one plate on the plate mounting base 66 fixedly installed on a part of the outer peripheral surface 61 a of the plate cylinder 61. The stencil sheet clamping portion 65 will be described later in detail.

  On the plate mounting base 66, a flip-up plate (not shown) for flipping up the tip side of the used stencil sheet M from the plate cylinder 61 side at the time of discharging is provided so as to be openable and closable in conjunction with the cam drive unit 40. However, for the flip-up plate, refer to Patent Document 2 shown above.

  A reflecting material 74 is attached to the outer peripheral surface 61 a of the plate cylinder 61 on the downstream side of the plate mounting base 66 in the rotation direction. Accordingly, a light reflection sensor 75 is installed outside the outer peripheral surface 61a of the plate cylinder 61 corresponding to the position of the reflecting material 74 when the plate mounting base 66 on the plate cylinder 61 reaches the upper side. ing. The presence or absence of the stencil sheet M on the outer peripheral surface 61 a of the plate cylinder 61 can be detected by the reflecting material 74 and the light reflection type sensor 75.

  A doctor roller 76 and an ink roller 77 are rotatably provided below the plate cylinder 61 while being in contact with each other. Further, the ink IK supplied from the center shaft 62 of the plate cylinder 61 is accumulated between the doctor roller 76 and the ink roller 77, and this ink IK passes through the gap between the doctor roller 76 and the ink roller 77 and this ink IK. The stencil sheet M wound around the outer peripheral surface 61 a of the plate cylinder 61 is supplied from the outer peripheral surface of the roller 77.

  A press roller 78 is provided below the plate cylinder 61 so as to be able to come into contact with and separate from the outer peripheral surface 61a of the plate cylinder 61 with a predetermined pressing force by a not-shown press roller contact / separation mechanism.

  The press roller 78 described above is separated from the outer peripheral surface 61a when the clamp plate 67 provided on a part of the outer peripheral surface 61a passes downward as the plate cylinder 61 rotates.

  Further, a peeling claw 79 is installed near the outer peripheral surface 61 a of the plate cylinder 61 on the lower right side of the plate cylinder 61. The peeling claw 79 has a function of peeling the paper P printed by the printing unit 60 from the outer peripheral surface 61 a side of the plate cylinder 61.

  In the printing unit 60, the plate cylinder 61 starts to rotate counterclockwise from the plate cylinder reference position set in the upper right part, and is attached to a part of the outer peripheral surface 61a of the plate cylinder 61 so as to be opened and closed. When 67 reaches the upper plate-making position, the clamp plate 67 is opened by the cam drive unit 40 to clamp the stencil sheet M that has been made from the plate-making unit 30 and has been sent from the plate-making unit 30.

  Thereafter, while the plate cylinder 61 is rotated, the reflection state from the reflecting material 74 attached to the outer peripheral surface 61a of the plate cylinder 61 is detected by the light reflection type sensor 75, and the presence of the stencil sheet is detected via the control unit 95. When the plate cylinder 61 is rotated counterclockwise, the stencil sheet M for one plate is wound along the outer peripheral surface 61 a of the plate cylinder 61.

  Then, after the clamp plate 67 that clamps the stencil sheet M passes through the press roller 78, the plate making in which the unprinted paper P sent from the paper feeding unit 50 is wound around the outer peripheral surface 61 a of the plate cylinder 61 by the press roller 78. The ink IK supplied to the plate cylinder 61 while being pressed against the stencil sheet M and transported the sheet P toward the downstream side passes through the stencil sheet M and corresponds to the perforated image portion of the stencil sheet M on the sheet P. The image is printed.

  Next, the paper discharge unit 80 is installed on the right side surface 2 c side of the apparatus housing 2. The paper discharge unit 80 includes a paper discharge roller pair 81 that discharges the printed paper P and a paper discharge tray 82 that stacks the printed paper P.

  In the paper discharge unit 80, the printed paper P is peeled off from the plate cylinder 61 by the peeling claw 79 and discharged onto the paper discharge tray 82 through the paper discharge roller pair 81.

  Next, the plate removal unit 90 is installed in the upper left part of the plate cylinder 61 in the apparatus housing 2. In the plate discharging unit 90, the used stencil sheet M peeled from the outer peripheral surface 61a of the plate cylinder 61 by a not-shown flip-up plate is stored in a plate discharging box (not shown).

  Next, the control unit 95 is installed at an appropriate position in the apparatus housing 2. The control unit 95 includes a CPU 95 a that controls the conveyance timing of the stencil sheet M when the stencil sheet M is clamped, a ROM 95 b that stores an operation program of the stencil printing apparatus 1, and various types that can be changed in the stencil printing apparatus 1. And a counter 95d that counts the number of pulses output from the encoder 64 attached to the plate cylinder motor 63.

  Then, the control unit 95 includes the operation panel unit 10, the document reading unit 20, the plate making unit 30, the cam driving unit 40, the paper feeding unit 50, the printing unit 60, the paper discharge unit 80, and the plate discharging unit 90. And control each.

  Here, the stencil sheet clamp portion 65 provided on a part of the outer peripheral surface 61a of the plate cylinder 61, which is a main part of the present invention, will be described with reference to FIGS. In FIG. 2 to FIG. 4, the flip-up plate is not shown for convenience of explanation.

  2 to 4 show the first to third embodiments 65A to 65C of the stencil sheet clamping unit 65 shown in FIG. 1 in an enlarged manner. In the present invention, three first to third embodiments 65A to 65C are shown. Any one embodiment of 65C is applied.

  First, in the stencil sheet clamp portion 65A (65) of the first embodiment shown in FIG. 2, a plate mounting base 66 is formed on a part of the outer peripheral surface 61a of the cylindrical plate cylinder 61, and is made of a nonmagnetic aluminum material or synthetic resin. The plate cylinder 61 is formed in a plate shape having a predetermined height and a predetermined width along the circumferential direction of the plate cylinder 61 using a material, and the axial length of the plate cylinder 61 along the axial direction of the plate cylinder 61. It is formed in a long length with substantially the same length. At this time, the upper surface 66a of the plate mounting base 66 is roughened so that the front end Ma side of the stencil sheet M does not slip.

  In addition, a clamp plate 67 for clamping the front end Ma side of the stencil sheet M along the width direction is provided above the plate mounting base 66 so as to be openable and closable.

  The clamp plate 67 is provided with a clamp surface 67a, which is formed of a stainless steel and having a flat front end, facing the upper surface 66a of the plate mounting base 66 along the axial direction of the plate cylinder 61. . Further, a pair of bent pieces 67b, which are bent on both sides in the axial direction of the plate cylinder 61 on the rear end side of the clamp plate 67, are fixed to a pair of shaft support plates (not shown) on both side ends in the axial direction of the plate cylinder 61. (1) through a pair of pivot shafts 68 provided laterally, and supported by a pair of tension springs 69 while being urged in the closing direction.

  Further, a cam follower 70 that contacts and separates from a cam (not shown) of the cam drive unit 40 with at least one bent piece 67b of a pair of bent pieces 67b formed on the rear end side of the clamp plate 67 via a shaft 71 is provided. The plate cylinder 61 is attached so as to protrude outward from one side of the plate cylinder 61.

  Then, when the stencil sheet clamp portion 65 </ b> A is integrated with the plate cylinder 61, a cam (not shown) of the cam drive unit 40 comes into contact with the cam follower 70 so that the clamp plate 67 is moved to the pair of rotating shafts 68. Since the plate-making stencil sheet M sent from the plate-making part 30 is opened between the top surface 66a of the plate-mounting base 66 and the clamp surface 67a of the clamp plate 67. Enter.

  At this time, in the front end portion Ma of the stencil sheet M to which the resin film and the Japanese paper are bonded, the Japanese paper side faces the upper surface 66a of the plate mounting base 66, and the resin film side faces the clamp surface 67a of the clamp plate 67.

  Thereafter, when the plate cylinder 61 rotates counterclockwise (in the direction of the arrow), the cam (not shown) of the cam drive unit 40 is separated from the cam follower 70, so that the clamp plate 67 is applied by the biasing force of the pair of tension springs 69. Is closed, and the leading end Ma side of the stencil sheet M after the plate making is clamped (clamped) between the upper surface 66a of the plate mounting base 66 and the clamp surface 67a of the clamp plate 67. At this time, the clamping force to the stencil sheet M is based only on the biasing force of the pair of tension springs 69.

  Next, in the stencil sheet clamp portion 65B (65) of the second embodiment shown in FIG. 3, the clamping force by the pair of tension springs 69 on the clamp plate 67 is applied to the stencil sheet clamp portion 65A of the first embodiment. We take measures to weaken.

  That is, in the stencil sheet clamp portion 65B of the second embodiment, a rubber magnet plate 72 formed in a long shape along the axial direction of the plate cylinder 61 is fitted on the upper surface 66a side of the plate mounting base 66, The upper surface 72 a of the magnet plate 72 is the same height as the upper surface 66 a of the plate mounting base 66. Along with this, the clamp plate 67 is formed using a stainless steel plate having magnetism.

  Therefore, the front end portion Ma side of the stencil sheet M has a pair of tension springs 69 in which the urging force is weakened between the upper surface 66a of the plate mounting base 66 and the upper surface 72a of the magnet plate 72 and the clamp surface 67a of the clamp plate 67. The magnet plate 72 is clamped by the clamping force.

  Next, the stencil sheet clamp portion 65C (65) of the third embodiment shown in FIG. 4 is also clamped by the pair of tension springs 69 to the clamp plate 67 with respect to the stencil sheet clamp portion 65A of the first embodiment. We take measures to weaken.

  That is, in the stencil sheet clamp portion 65C of the third embodiment, a rubber magnet plate 73 formed in a long shape along the axial direction of the plate cylinder 61 is stuck on the upper surface 66a of the plate mounting base 66. . At this time, the upper surface 73a of the magnet plate 73 protrudes from the upper surface 66a of the plate mounting base 66, and the upper surface 73a is roughened so that the leading end Ma side of the stencil sheet M does not slip. Along with this, the clamp plate 67 is formed using a stainless steel plate having magnetism.

  Therefore, the front end portion Ma side of the stencil sheet M is formed by the pair of tension springs 69 and the magnet plate 73 that weaken the urging force between the upper surface 73a of the rubber magnet plate 73 and the clamp surface 67a of the clamp plate 67. It is clamped by the clamping force.

  Here, in the present invention, the stencil sheet M wound around the outer peripheral surface 61a of the plate cylinder 61 when any of the stencil sheet clamp portions 65A to 65C of the first to third embodiments described above is applied. Ink / ink oil components are prevented so that the ink or the oil component of the ink transmitted to the front side of the Japanese paper does not wrap around between the top surface side of the resin film of the stencil sheet M and the clamp surface 67a of the clamp plate 67. We are trying to prevent wraparound.

  The above-described measures to prevent the ink / ink oil component from sneaking around are as follows: the front end Ma side of the stencil sheet M is provided on a part of the outer peripheral surface 61a of the plate cylinder 61, and the clamp surface 67a side of the clamp plate 67. At least one of the plate mounting base 66 side and the clamp plate 67 side of the clamp plate 67 does not come into contact with the most advanced portion of the front end portion Ma side of the stencil sheet M. Is not clamped, and this will be specifically described with reference to FIGS.

  First, FIGS. 5A to 5F show first to first measures for preventing the stencil sheet clamping unit 65A of the first embodiment (or the stencil sheet clamping unit 65B of the second embodiment) from wrapping around the ink / ink oil component. The sixth embodiment is schematically shown, and any of the first to sixth embodiments is adopted when the first embodiment (or the second embodiment) is applied.

  In FIG. 5, the stencil sheet clamp portion 65B of the second embodiment has a rubber magnet plate 72 fitted on the upper surface 66a side of the plate mounting base 66 as described above with reference to FIG. The only difference is that the stencil sheet clamp 65A of the first embodiment is different from the stencil sheet clamp 65A of the first embodiment.

  In the first embodiment (or the second embodiment), when the stencil sheet M is clamped, the Japanese paper W is in contact with the upper surface 66a of the stencil sheet base 66 on the tip portion Ma side of the stencil sheet M, and the resin film F is Since it is in contact with the clamp surface 67 a of the clamp plate 67, the leading end portion Ma of the stencil sheet M is clamped between the upper surface 66 a of the plate mounting base 66 and the clamp surface 67 a of the clamp plate 67.

  That is, as shown in FIG. 5A, in the first embodiment of the stencil sheet clamping portion 65A of the first embodiment, the escape hole is formed on the upstream side of the end portion 66b in the rotational direction of the plate cylinder 61 in the plate mounting base 66. 66 c is formed long along the axial direction of the plate cylinder 61. The escape hole 66 c is formed so that the leading edge portion Wa of the Japanese paper W on the front end portion Ma side of the stencil sheet M does not contact the upper surface 66 a of the plate mounting base 66. Therefore, the most advanced portion of the stencil sheet M on the front end portion Ma side does not contact the plate mounting base 66 and is not clamped.

  If the clamping width of the stencil sheet M on the plate mounting base 66 with respect to the rotation direction of the plate cylinder 61 is about 20 mm to 25 mm, the width of the leading edge portion Ma of the leading end portion Ma of the stencil paper M that is not clamped by the plate mounting base 66 May be about 1 mm to 2 mm.

  As a result, the ink transmitted to the leading edge portion Wa of the Japanese paper W and the oil component of the ink are not transmitted to the leading edge portion Fa of the resin film F by the escape holes 66c formed in the plate mounting base 66, but the leading edge of the stencil sheet M. Since it does not go around between the upper surface side of the portion Ma and the clamp surface 67a of the clamp plate 67, the upper surface side of the front end portion Ma of the stencil sheet M can be prevented from sticking to the clamp surface 67a of the clamp plate 67. The stencil sheet M can be reliably discharged.

  As shown in FIG. 5B, in the second form of the stencil sheet clamping portion 65A of the first embodiment, one end 67c side of the clamping surface 67a of the clamping plate 67 upstream of the plate cylinder 61 in the rotational direction. A relief hole 67d is formed in an elongated shape along the axial direction of the plate cylinder 61. The escape hole 67 d is formed so that the most advanced portion Fa of the resin film F on the front end portion Ma side of the stencil sheet M does not contact the clamp surface 67 a of the clamp plate 67. Therefore, the most advanced portion of the stencil sheet M on the front end portion Ma side does not contact the clamp surface 67a of the clamp plate 67 and is not clamped.

  Thus, even if the ink transmitted to the most advanced portion Wa of the Japanese paper W or the oil component of the ink is transmitted to the most advanced portion Fa of the resin film F, the stencil sheet M is formed by the escape holes 67d formed in the clamp surface 67a of the clamp plate 67. Since the upper surface side of the front end portion Ma of the stencil sheet M can be prevented from sticking to the clamp surface 67a of the clamp plate 67, the upper surface side of the front end portion Ma of the stencil sheet M can be prevented from sticking to the clamp surface 67a. It is possible to reliably perform the discharging operation on the used stencil sheet M.

  Further, as shown in FIG. 5C, in the third embodiment of the stencil sheet clamp portion 65A of the first embodiment, the tip of the one end portion 66b of the plate mounting base 66 is cut shorter than usual. The cutting portion of the one end portion 66 b of the plate mounting base 66 is formed so that the leading end portion Wa of the Japanese paper W on the front end portion Ma side of the stencil sheet M does not contact the upper surface 66 a of the plate mounting base 66. Therefore, the most advanced portion of the stencil sheet M on the front end portion Ma side does not contact the plate mounting base 66 and is not clamped.

  As a result, the ink transmitted to the leading edge portion Wa of the Japanese paper W and the oil component of the ink are not transmitted to the leading edge portion Fa of the resin film F by cutting the one end 66b of the plate mounting base 66, but the leading edge of the stencil sheet M. Since it does not go around between the upper surface side of the portion Ma and the clamp surface 67a of the clamp plate 67, the upper surface side of the front end portion Ma of the stencil sheet M can be prevented from sticking to the clamp surface 67a of the clamp plate 67. The stencil sheet M can be reliably discharged.

  As shown in FIG. 5D, in the fourth embodiment of the stencil sheet clamp portion 65A of the first embodiment, the tip of one end portion 67c of the clamp surface 67a of the clamp plate 67 is cut shorter than usual. The cutting portion of the one end portion 67 c of the clamp surface 67 a is formed so that the most distal portion Fa of the resin film F on the front end portion Ma side of the stencil sheet M does not contact the clamp surface 67 a of the clamp plate 67. Therefore, the most advanced portion of the stencil sheet M on the front end portion Ma side does not contact the clamp surface 67a of the clamp plate 67 and is not clamped.

  Thereby, even if the ink transmitted to the leading edge Wa of the Japanese paper W and the oil component of the ink are transmitted to the leading edge Fa of the resin film F, the stencil sheet M is cut by cutting the one end 67c of the clamping surface 67a of the clamp plate 67. Since the upper surface side of the front end portion Ma of the stencil sheet M can be prevented from sticking to the clamp surface 67a of the clamp plate 67, the upper surface side of the front end portion Ma of the stencil sheet M can be prevented from sticking to the clamp surface 67a. It is possible to reliably perform the discharging operation on the used stencil sheet M.

  5E, in the fifth embodiment of the stencil sheet clamp portion 65A of the first embodiment, a concave stop 67e is provided on the one end 67c side of the clamp surface 67a of the clamp plate 67 in the axial direction of the plate cylinder 61. It is formed along the length. The concave diaphragm 67e is formed so that the most distal portion Fa of the resin film F on the front end portion Ma side of the stencil sheet M does not contact the clamp surface 67a of the clamp plate 67. Therefore, the most advanced portion of the stencil sheet M on the front end portion Ma side does not contact the clamp surface 67a of the clamp plate 67 and is not clamped.

  Thereby, even if the ink transmitted to the most advanced portion Wa of the Japanese paper W and the oil component of the ink are transmitted to the most advanced portion Fa of the resin film F, the stencil sheet M is formed by the concave diaphragm 67e formed on the clamp surface 67a of the clamp plate 67. Since the upper surface side of the front end portion Ma of the stencil sheet M can be prevented from sticking to the clamp surface 67a of the clamp plate 67, the upper surface side of the front end portion Ma of the stencil sheet M can be prevented from sticking to the clamp surface 67a. It is possible to reliably perform the discharging operation on the used stencil sheet M.

  In the case of the first to fifth embodiments shown in FIGS. 5A to 5E, the shape of the clamp surface 67a of the plate mounting base 66 or the clamp plate 67 is changed from the normal one. However, the control for feeding the leading end Ma side of the stencil sheet M to the plate cylinder 61 side is performed as usual.

  On the other hand, as shown in FIG. 5F, in the sixth embodiment of the stencil sheet clamping portion 65A of the first embodiment, the plate mounting base 66 and the clamp surface 67a of the clamp plate 67 are both formed in a normal shape. Then, the clamping timing of the stencil sheet M is controlled by a command from the control unit 95, and the most distal end portion Ma1 of the leading end portion Ma of the stencil sheet M is changed to one end 66b of the plate mounting base 66 and one end of the clamp surface 67a of the clamp plate 67 It projects forward from 67c.

  Therefore, the most advanced portion Wa of the Japanese paper W in the most advanced portion Ma1 of the stencil sheet M does not contact the upper surface 66a of the plate mounting base 66, and the most advanced portion Fa of the resin film F is also the clamping surface of the clamp plate 67. No contact with 67a. Accordingly, the forefront portion Ma1 of the stencil sheet M on the front end portion Ma side does not come into contact with the plate mounting base 66 and the clamp surface 67a of the clamp plate 67 and is not clamped.

  As a result, the ink transmitted to the leading edge portion Wa of the Japanese paper W and the oil component of the ink are not transmitted to the leading edge portion Fa of the resin film F, and the clamp plate 67 clamps the upper surface side of the leading end portion Ma of the stencil sheet M. Since it does not wrap around with the surface 67a, the upper surface side of the leading end portion Ma of the stencil sheet M can be prevented from sticking to the clamp surface 67a of the clamp plate 67, so that the stencil sheet M is reliably discharged to the used stencil sheet M. It can be performed.

  Next, FIGS. 6A to 6F schematically show first to sixth forms of measures for preventing the stencil sheet clamp portion 65C of the third embodiment from causing the ink / ink oil component to wrap around. Any of the first to sixth embodiments is adopted when the third embodiment is applied.

  In FIG. 6, the stencil sheet clamping portion 65C of the third embodiment has a rubber magnet plate 73 protruding on the upper surface 66a of the plate mounting base 66 as described above with reference to FIG. In FIG. 6, the illustration of the plate mounting base 66 is omitted.

  In the third embodiment, when the stencil sheet M is clamped, the Japanese paper W contacts the upper surface 73 a of the magnet plate 73 and the resin film F contacts the clamp surface 67 a of the clamp plate 67. Since they are in contact with each other, the leading end portion Ma of the stencil sheet M is clamped between the upper surface 73 a of the magnet plate 73 and the clamp surface 67 a of the clamp plate 67.

  That is, as shown in FIG. 6A, in the first form of the stencil sheet clamp portion 65C of the third embodiment, the escape hole 73c is formed on the one end 73b side of the magnet plate 73 on the upstream side in the rotational direction of the plate cylinder 61. Is formed in a long shape along the axial direction of the plate cylinder 61. The escape hole 73 c is formed so that the most advanced portion Wa of the Japanese paper W on the front end portion Ma side of the stencil sheet M does not come into contact with the upper surface 73 a of the magnet plate 73. Therefore, the most advanced portion of the stencil sheet M on the front end portion Ma side does not contact the magnet plate 73 and is not clamped.

  If the clamping width of the stencil sheet M on the magnet plate 73 with respect to the rotation direction of the plate cylinder 61 is about 20 mm to 25 mm, the width of the leading end portion Ma of the stencil sheet M that is not clamped by the magnet plate 73 is 1 mm. It may be about ˜2 mm.

  Thereby, the ink transmitted to the leading edge Wa of the Japanese paper W and the oil component of the ink are not transmitted to the leading edge Fa of the resin film F by the escape holes 73c formed in the magnet plate 73, but the leading edge of the stencil sheet M Since it does not go around between the upper surface side of Ma and the clamp surface 67a of the clamp plate 67, the upper surface side of the front end portion Ma of the stencil sheet M can be prevented from sticking to the clamp surface 67a of the clamp plate 67. The stencil sheet can be reliably discharged to the stencil sheet M.

  Further, as shown in FIG. 6B, in the second form of the stencil sheet clamping portion 65C of the third embodiment, one end 67c side of the clamping surface 67a of the clamp plate 67 upstream of the plate cylinder 61 in the rotational direction. A relief hole 67d is formed in an elongated shape along the axial direction of the plate cylinder 61. The escape hole 67 d is formed so that the most advanced portion Fa of the resin film F on the front end portion Ma side of the stencil sheet M does not contact the clamp surface 67 a of the clamp plate 67. Therefore, the most advanced portion of the stencil sheet M on the front end portion Ma side does not contact the clamp surface 67a of the clamp plate 67 and is not clamped.

  As a result, as in the case of FIG. 5B described above, the ink transmitted to the most advanced portion Wa of the Japanese paper W and the oil component of the ink are clamped between the upper surface side of the front end portion Ma of the stencil sheet M and the clamp plate 67. Since it does not wrap around with the surface 67a, the upper surface side of the leading end portion Ma of the stencil sheet M can be prevented from sticking to the clamp surface 67a of the clamp plate 67, so that the stencil sheet M is reliably discharged to the used stencil sheet M. It can be performed.

  Further, as shown in FIG. 6C, in the third form of the stencil sheet clamp part 65C of the third embodiment, the tip of the one end part 73b of the magnet plate 73 is cut shorter than usual. The cutting portion of the one end portion 73 b of the magnet plate 73 is formed so that the foremost portion Wa of the Japanese paper W does not contact the upper surface 73 a of the magnet plate 73 on the leading end portion Ma side of the stencil sheet M. Therefore, the most advanced portion of the stencil sheet M on the front end portion Ma side does not contact the magnet plate 73 and is not clamped.

  As a result, the ink and the oil component of the ink transmitted to the leading edge portion Wa of the Japanese paper W are not transmitted to the leading edge portion Fa of the resin film F due to the cutting of the one end portion 73b of the magnet plate 73, but the leading edge portion of the stencil sheet M Since it does not wrap around between the upper surface side of Ma and the clamp surface 67a of the clamp plate 67, the upper surface side of the tip portion Ma of the stencil sheet M can be prevented from sticking to the clamp plate 67. In contrast, it is possible to reliably perform the plate removal operation.

  Further, as shown in FIG. 6D, in the fourth embodiment of the stencil sheet clamp portion 65C of the third embodiment, the tip of one end portion 67c of the clamp surface 67a of the clamp plate 67 is cut shorter than usual. The cutting portion of the one end portion 67 c of the clamp surface 67 a is formed so that the most distal portion Fa of the resin film F on the front end portion Ma side of the stencil sheet M does not contact the clamp surface 67 a of the clamp plate 67. Therefore, the most advanced portion of the stencil sheet M on the front end portion Ma side does not contact the clamp surface 67a of the clamp plate 67 and is not clamped.

  As a result, as in the case of FIG. 5D described above, the ink transmitted to the most advanced portion Wa of the Japanese paper W and the oil component of the ink are clamped between the upper surface side of the front end portion Ma of the stencil sheet M and the clamp plate 67. Since it does not wrap around with the surface 67a, the upper surface side of the leading end portion Ma of the stencil sheet M can be prevented from sticking to the clamp surface 67a of the clamp plate 67, so that the stencil sheet M is reliably discharged to the used stencil sheet M. It can be performed.

  6E, in the fifth embodiment of the stencil sheet clamp portion 65C of the third embodiment, a concave stop 67e is provided on the one end 67c side of the clamp surface 67a of the clamp plate 67 in the axial direction of the plate cylinder 61. It is formed along the length. The concave diaphragm 67e is formed so that the most distal portion Fa of the resin film F on the front end portion Ma side of the stencil sheet M does not contact the clamp surface 67a of the clamp plate 67. Therefore, the most advanced portion of the stencil sheet M on the front end portion Ma side does not contact the clamp surface 67a of the clamp plate 67 and is not clamped.

  As a result, as in the case of FIG. 5E described above, the ink transmitted to the most advanced portion Wa of the Japanese paper W and the oil component of the ink are clamped between the upper surface side of the front end portion Ma of the stencil sheet M and the clamp plate 67. Since it does not wrap around with the surface 67a, the upper surface side of the leading end portion Ma of the stencil sheet M can be prevented from sticking to the clamp surface 67a of the clamp plate 67, so that the stencil sheet M is reliably discharged to the used stencil sheet M. It can be performed.

  In the case of the first to fifth embodiments shown in FIGS. 6A to 6E, the shape of the clamp surface 67a of the magnet plate 73 or the clamp plate 67 is changed from the normal one. The control for feeding the leading end Ma side of the stencil sheet M to the plate cylinder 61 side is performed as usual.

  On the other hand, as shown in FIG. 6 (f), in the sixth embodiment of the stencil sheet clamp portion 65C of the third embodiment, the magnet plate 73 and the clamp surface 67a of the clamp plate 67 are both formed in a normal shape. The clamp timing of the stencil sheet M is controlled by a command from the control unit 95, and the most advanced portion Ma1 of the leading end Ma of the stencil sheet M is moved from one end 73b of the magnet plate 73 and one end 67c of the clamp surface 67a of the clamp plate 67. Also project forward.

  Accordingly, the most advanced portion Wa of the Japanese paper W among the most advanced portions Ma1 of the stencil sheet M does not come into contact with the upper surface 73a of the magnet plate 73, and the most advanced portion Fa of the resin film F is also the clamp surface 67a of the clamp plate 67. Do not touch. Therefore, the forefront portion Ma1 of the stencil sheet M on the front end portion Ma side does not come into contact with the clamp surface 67a of the magnet plate 73 and the clamp plate 67 and is not clamped.

  As a result, the ink transmitted to the leading edge portion Wa of the Japanese paper W and the oil component of the ink are not transmitted to the leading edge portion Fa of the resin film F, and the clamp plate 67 clamps the upper surface side of the leading end portion Ma of the stencil sheet M. Since it does not wrap around with the surface 67a, the upper surface side of the leading end portion Ma of the stencil sheet M can be prevented from sticking to the clamp surface 67a of the clamp plate 67, so that the stencil sheet M is reliably discharged to the used stencil sheet M. It can be performed.

  As described above in detail, according to the stencil printing apparatus 1 to which any one of the stencil sheet clamp portions 65A to 65C of the first to third embodiments is applied, the front end Ma side of the stencil sheet M is set to the plate mounting base 66 side. At the time of clamping between the clamp plate 67 and the clamp surface 67a side, at least one of the plate mounting base 66 side and the clamp surface 67a side of the clamp plate 67 is at the most advanced portion Ma1 of the front end portion Ma side of the stencil sheet M. It is constituted so that this most advanced part Ma1 is not clamped without contact.

  In the above, the plate mounting pedestal 66 side refers to the case of only the plate mounting pedestal 66 according to the first embodiment, the case where the magnet plate 72 is embedded in the plate mounting pedestal 66 according to the second embodiment, and the third embodiment. The case where the magnet plate 73 is stuck on the plate mounting base 66 according to the form is included.

  On the other hand, the clamp surface 67 a side of the clamp plate 67 includes a case where a magnet plate (not shown) is attached to the clamp surface 67 a and a magnetic material having magnetism is used for the plate mounting base 66.

  From the above, at least one of the plate mounting base 66 and the clamp plate 67 has a shape that does not come into contact with the most advanced portion Ma1 on the front end portion Ma side of the stencil sheet M when the stencil sheet M is clamped.

  The plate cylinder 61, the plate mounting base 66, the clamp plate 67, and the clamp plate opening / closing means (cam drive unit) 40 are provided at least, and a transport unit (for transporting the stencil sheet M to the clamp plate 67 ( (Not shown), and when the stencil sheet M is clamped, the transport unit is at least one of the plate mounting pedestal 66 side and the clamp surface 67a side of the clamp plate 67 is the most advanced of the stencil sheet M front end part Ma side. The stencil sheet M is conveyed so as not to contact the part Ma1.

  As a result, the ink or the oil component of the ink transmitted to the most advanced portion Ma1 in the front end portion Ma1 side of the stencil sheet M is between the upper surface side of the front end portion Ma of the stencil sheet M and the clamp surface 67a of the clamp plate 67. Since it does not wrap around, it is possible to prevent the upper surface side of the front end portion Ma of the stencil sheet M from sticking to the clamp surface 67a of the clamp plate 67, so that the stencil sheet M can be reliably discharged.

DESCRIPTION OF SYMBOLS 1 ... Stencil printing apparatus, 2 ... Apparatus housing, 2a ... Top surface, 2b ... Left side surface, 2c ... Right side surface,
DESCRIPTION OF SYMBOLS 10 ... Operation panel part, 20 ... Document reading part, 24 ... CCD image sensor,
30: Plate making section, 32 ... Thermal head, 33 ... Platen motor,
34 ... Platen roller, 36 ... Base paper cutter pair,
40: Clamp plate opening / closing means (cam drive unit), 50 ... Paper feeding unit,
60 ... Printing section, 61 ... Plate cylinder, 61a ... Outer peripheral surface, 62 ... Center axis, 62a ... Ink insertion port,
63: Plate cylinder motor, 64 ... Encoder,
65 ... stencil paper clamp part,
65A-65C ... stencil sheet clamp part of 1st-3rd embodiment,
66: Plate mounting base, 66a: Top surface,
67 ... Clamp plate, 67a ... Clamp surface, 67b ... Bending piece,
68 ... rotating shaft, 69 ... tension spring, 70 ... cam follower, 71 ... shaft,
72 ... Magnet plate, 72a ... Upper surface, 73 ... Magnet plate, 73a ... Upper surface,
74 ... reflective material, 75 ... light reflection type sensor,
76 ... Doctor roller, 77 ... Ink roller, 78 ... Press roller, 79 ... Peeling nail,
80: paper discharge unit, 90: discharge unit, 95: control unit, 95a: CPU (determination unit),
G: manuscript, IK ... ink, M ... stencil paper, Ma ... tip, Ma1 ... most advanced part,
F ... resin film, Fa ... the most advanced part of resin film,
W: Japanese paper, Wa: The most advanced part of Japanese paper, P: Paper.

Claims (3)

A plate cylinder having a cylindrical outer peripheral surface and rotating around a central axis;
A plate mounting base fixedly installed along the axial direction of the plate cylinder on a part of the outer peripheral surface of the plate cylinder;
A clamp plate having a clamping surface that is supported so as to be openable and closable facing the plate mounting base, and that is closed at the time of plate-making and clamps the leading end side of the stencil sheet that has been made.
A clamping plate opening and closing means for opening and closing the clamping plate,
A stencil printing apparatus configured to clamp the front end side of the stencil sheet between the stencil mounting base side and the clamp surface side of the clamp plate and wind the stencil sheet around the outer peripheral surface of the plate cylinder. In
Stencil printing characterized in that at the time of clamping the stencil sheet, at least one of the stencil mounting base side and the clamp surface side of the clamp plate is not in contact with the most advanced part of the front end side of the stencil sheet. apparatus. In the above-described configuration, the image forming apparatus further includes a transport unit that transports the stencil sheet to the clamp plate,
The transport unit is configured so that, when the stencil sheet is clamped, at least one of the stencil mounting base side and the clamp surface side of the clamp plate does not come into contact with the most advanced portion of the stencil sheet front end side. The stencil printing apparatus according to claim 1, wherein the stencil printing apparatus is conveyed.   2. The structure according to claim 1, wherein at least one of the plate mounting base and the clamp plate has a shape that does not come into contact with the most distal portion of the front end portion side of the stencil sheet when the stencil sheet is clamped. The stencil printing apparatus according to claim 1 or 2.

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