JP2002046336A - Plate cylinder for stencil printing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the outer peripheral surface of a peripheral wall and printing paper from being stained with ink. SOLUTION: An ink stopping sheet 56 covering an area from the rear end portion of an ink passing region 52 to an opening region 55 through an ink non-passing edge part 54, on the outer peripheral surface side of the peripheral wall 28 made cylindrical and constituting a plate cylinder 24 for stencil printing, is made non-adhesive, with a non-adhesive part 57 interposed, in a portion where it covers the ink non-passing edge part 54. Thereby the ink oozing out to the outer peripheral surface side of the peripheral wall 28 from the rear end of the ink passing region 52 in the direction of rotation (arrow A) of the peripheral wall 28, in printing, is made to pass to the non-adhesive part 57, covered with the ink stopping sheet 56, and is led to the opening region 55 and returned to the inner peripheral surface side of the peripheral wall 28. Therefore the backflow of the ink to the rear end part side of stencil paper M is prevented and consequently the outer peripheral surface of the peripheral wall 25 and the printing paper are prevented from being stained with the ink.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing plate cylinder having a cylindrical peripheral wall.

[0002]

2. Description of the Related Art Generally, a stencil printing apparatus has a stencil plate cylinder (hereinafter referred to as a "plate cylinder") in which a peripheral wall having a porous structure is arranged in a cylindrical shape and is rotatable around its own axis. ing. On the outer peripheral surface of the peripheral wall, a perforated stencil sheet is wound and mounted. Inside the plate cylinder, there is an ink supply means for supplying ink to the outer peripheral surface side of the peripheral wall so as to pass the ink. Outside the plate cylinder, there is a pressing means for pressing the printing paper against the outer peripheral surface of the peripheral wall (plated stencil paper). For example, there is an impression cylinder as the pressing means. The impression cylinder has the same outer diameter as the plate cylinder, is provided parallel to the plate cylinder at a predetermined distance from the peripheral wall, and rotates synchronously around its own central axis at the same speed as the plate cylinder. Further, inside the plate cylinder, there is an ink supply roller which forms a part of the ink supply means. The ink supply roller is
The peripheral wall is pressed against the inner peripheral surface of the peripheral wall to bulge and deform toward the impression cylinder. Then, the printing paper was supplied between the plate cylinder and the impression cylinder in synchronization with the rotation of the plate cylinder, and the plate was formed on the plate cylinder between the peripheral wall swelled and deformed by the ink supply roller and the impression cylinder. By pressing the printing paper against the stencil sheet, the ink passes through the perforated portion of the stencil sheet and is transferred to the printing sheet to perform printing.

FIG. 4A is a developed view of a peripheral wall of a conventional stencil printing plate cylinder, and FIG. 4B is a sectional side view of FIG. 4A. As shown in FIGS. 4A and 4B, a peripheral wall 101 constituting the plate cylinder 100 includes an ink-permeable region 102 and an ink-impermeable region 1 surrounding the ink-permeable region 102.
03. The ink-permeable region 10 of the peripheral wall 101 in the rotation direction of the plate cylinder 100 (arrow A in FIG. 4).
An ink-permeable opening area 105 is provided on the rear end side of the second unit 2 via an ink-impermeable edge 104. The ink impermeable edge portion 104 is formed by applying a material such as silicon that is not affected by ink to the inner peripheral surface of the peripheral wall 101 inside the plate cylinder 100 by a printing method or the like. An ink stopper sheet 106 is provided on the outer peripheral surface side of the peripheral wall 101 outside the plate cylinder 100. The ink stopper sheet 106 is adhered to the ink impermeable region 103 (including a portion that covers the ink impermeable edge 104) of the peripheral wall 101.

A stencil sheet M is formed on the peripheral wall 101 having the above-described configuration. The stencil sheet M is, as shown by a dashed line in FIGS.
The printing plate is covered so as to cover the portion of the ink stopper sheet 106 on the ink impermeable edge 104 with the back end covering the ink impermeable edge 02. During printing, an ink supply roller (not shown) presses the peripheral wall 101 from the front end to the rear end of the ink-permeable region 102 in accordance with the rotation direction of the plate cylinder 100 to swell and deform, so that the ink-impermeable edge At a position 104, the bulging deformation of the peripheral wall 101 is released by separating from the inner peripheral surface of the peripheral wall 101.

At the time of such printing, the ink that has oozed to the outer peripheral surface side of the peripheral wall 101 from the rear end of the ink permeable area 102 is blocked by the ink stopper sheet 106 and is prevented from flowing to the ink impermeable area 103. Is done. On this occasion,
The ink impervious edge 104 increases the pressing force of the rear end of the stencil sheet M by the pressing force of the ink supply roller, thereby producing a packing effect for preventing ink from leaking from the rear end of the stencil sheet M. I do.

Further, when many printings are repeatedly performed, the ink gradually enters the adhesive portion between the ink stopper sheet 106 and the peripheral wall 101, and the ink stopper sheet 10
6 is gradually peeled off partly from the peripheral wall 101. Then, the ink that has entered between the ink stopper sheet 106 and the peripheral wall 101 gradually proceeds to the rear end side of the ink stopper sheet 106, as shown in FIGS. 5A and 5B.
It is returned from the opening area 105 to the inside of the plate cylinder 100. Thus, when a large number of sheets are printed, an attempt is made to prevent ink stains on the outer peripheral surface of the plate cylinder 100 and the printing paper.

[0007]

However, in the conventional stencil printing plate cylinder described above, the ink stopper sheet 106 is used.
However, since the ink is adhered to the outer peripheral surface of the peripheral wall 101 on the ink impermeable edge 104, the invasion of the ink entering the adhesive portion between the ink stopper sheet 106 and the peripheral wall 101 progresses slowly in time. As a result, a state occurs in which the ink does not invade to the opening area 105 during the invasion of the ink, and this portion is formed into a bag shape as shown in FIG. The packing effect of 104 is canceled, and the ink is caused to flow backward toward the rear end of the ink passage area 102. Then, as shown in FIG. 6B, the back-flowed ink may leak from the rear end of the stencil sheet M to the outer peripheral surface side of the peripheral wall 101, and may stain the outer peripheral surface of the peripheral wall 101 and the printing paper. .

Accordingly, in order to solve the above-mentioned problems, the present invention prevents the ink contamination on the outer peripheral surface of the peripheral wall and the printing paper by sufficiently exerting the effect of preventing ink leakage by the ink stopper sheet and the opening area. It is an object of the present invention to provide a stencil printing plate cylinder that can perform the stencil printing.

[0009]

In order to achieve the above object, a stencil printing plate cylinder according to the present invention has a cylindrical shape having an ink-permeable region and an ink-impermeable region surrounding the ink-permeable region. A stencil sheet made by stencil is wound on the outer peripheral surface so as to cover the ink-permeable area, and a peripheral wall is driven to rotate around its own central axis, and along the generatrix of the peripheral wall inside the peripheral wall. An ink supply roller provided for passing the ink to be supplied to the inner peripheral surface of the peripheral wall from the ink passage area to the stencil sheet of the stencil paper wound on the outer peripheral side of the peripheral wall for printing; At the rear end of the ink-permeable region in the rotation direction, an ink-impermeable edge is formed so as to protrude from a cylindrical inner peripheral surface of the peripheral wall along the generatrix of the peripheral wall, and defines the ink-permeable region. Part and the peripheral wall At the rear of the ink impervious edge in the rotational direction, continuous to the ink-impervious edge,
In addition, the ink-permeable opening area formed along the generatrix of the peripheral wall, and the ink-impermeable edge from the rear end of the ink-permeable area on the cylindrical outer peripheral surface side of the peripheral wall. An ink stopper sheet provided so as to cover a range extending to the opening area through the ink stopper sheet, and a non-adhesive portion in which a portion of the ink stopper sheet over the ink impermeable edge is not adhered. And

[0010]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a side view showing an example of a stencil printing apparatus provided with a stencil printing plate cylinder of the present invention.

As shown in FIG. 1, the stencil printing apparatus has an original reading unit 1, a stencil making unit 2, a printing unit 3, a paper feeding unit 4, a paper discharging unit 5, and a stencil discharging unit 6. ing.

The document reading section 1 is arranged above the stencil printing apparatus, and can read a book-bound document (hereinafter referred to as a book document) and a sheet-shaped document (hereinafter referred to as a sheet document). It is configured.

A configuration for reading a book document and a sheet document for each sheet is, for example, an endless belt 9 attached to a pair of rollers 8.
1, a line image sensor 10 that moves in the left-right direction in FIG. 1, a document mounting glass table 11 on which each document is mounted, and an openable and closable mounted on the document mounting glass table 11. Pressure plate 12.

When reading each original, the surface to be read of a book original or a sheet original is placed on the original mounting glass table 1.
1 is placed downward, and pressed from above by the pressure plate 12. Then, the line image sensor 10 is moved. The line image sensor 10 scans at a predetermined speed between the home position A and the scan end position B shown in FIG. As a result, the image of the original on the original placing glass table 11 is read.

The stencil printing apparatus includes an automatic document feeder 13 for sequentially reading a plurality of sheet documents. The automatic document feeder 13 has a document set tray 14 on which a plurality of sheet documents are stacked. The sheet document on the document set tray 14
5 is fed into the automatic document feeder 13 one by one. The line image sensor 10 is moved to the position C (shown in FIG. 1) directly below the automatic document feeder 13 by the moving mechanism and fixedly arranged. As a result, the image of the scanned sheet document is read. After completion of the reading, the sheet document is sent out to the pressure plate 12 outside the automatic document feeder 13.

Next, the stencil making section 2 is composed of a stencil paper roll section 17 in which a heat-sensitive stencil sheet M made of a continuous sheet is stored in a roll form, and a plurality of point heating elements arranged in a horizontal line. The thermal head 18, a platen roller 19 disposed opposite to the thermal head 18, each stencil feed roller 20, a stencil guide roller 21, and the stencil cutter 2.
And 2.

The stencil making section 2 feeds the stencil sheet M pulled out from the stencil roll section 17 by sandwiching the stencil sheet M between the thermal head 18 and the platen roller 19 by the rotation of the platen roller 19. Image information on an image of a document read by the document reading unit 1 is input to the thermal head 18. The thermal head 18 selectively heats each of the point heating elements individually in accordance with the image information, and performs dot matrix heat-sensitive perforation on the stencil sheet M. The document guide roller 21 is provided with a silicon damper or the like serving as a tension applying mechanism at a shaft portion thereof, and appropriately applies tension to the stencil sheet M sent between the thermal head 18 and the platen roller 19. The stencil feed roller 20 sends the stencil sheet M, which has been made, to the plate cylinder 6 described later. In addition, the stencil sheet M that has been made is:
It is cut into one plate by the base paper cutter 22.

Next, the printing section 3 mainly has a stencil printing plate cylinder (hereinafter referred to as a plate cylinder) 24 and an impression cylinder 25. The plate cylinder 24 is provided with two rigid disk-shaped side plates 26 at both ends, and these two side plates 26 are connected to the rigid clamp base plate 2.
It is connected at 7. A peripheral wall 28 is arranged around each side plate 26.

The peripheral wall 28 is generally formed by weaving a flexible wire made of stainless steel wire or the like into a net shape. Therefore, the peripheral wall 28 is flexible and has a mesh portion to allow the passage of the printing ink. The peripheral wall 28 is wound around the outer peripheral surface of the side plate 26, one end of which is fixed to the clamp base plate 27, and the other end is connected to and supported by the crank base plate 27 via a spring. As described above, the peripheral wall 28 is arranged in a cylindrical shape along the outer peripheral surface of each side plate 26.
In addition, since the cylindrical peripheral wall 28 has flexibility, it can be expanded and deformed in the radial direction.

The cylindrical peripheral wall 28 is rotatably supported about its own central axis via each side plate 26. The peripheral wall 28 is driven to rotate counterclockwise in FIG. 1 by a driving mechanism (not shown).

A clamp base plate 27 for supporting the peripheral wall 28
, A clamp plate 29 forming a clamp mechanism is attached so as to be openable and closable with an axis parallel to a central axis (generic line) of the peripheral wall 28. The clamp plate 29 is connected to the plate making unit 2.
Is clamped at the leading end of the stencil sheet M transported from the printer. After the stencil sheet M has its leading end locked on the clamp base plate 27 side by the clamp plate 29, the stencil sheet M is wound around the outer peripheral surface of the peripheral wall 28 by the rotation of the peripheral wall 28.

An ink supply roller 30 is provided inside the cylindrical shape of the peripheral wall 28. Ink supply roller 30
Extends parallel to the generatrix of the peripheral wall 28 and extends into a cylindrical peripheral wall 28.
Are supported so as to be in sliding contact with the inner peripheral surface of the. The ink supply roller 30 is driven to rotate in the same direction as the peripheral wall 28 as the peripheral wall 28 rotates. Further, the ink supply roller 30
Is configured to be moved in a substantially vertical direction between a bulging deformation position at which the peripheral wall 28 bulges toward the impression cylinder 25 described later and a steady position at which the bulging deformation is released.

A doctor rod 31 extending parallel to the outer peripheral surface of the ink supply roller 30 at a minute interval is supported in the cylindrical interior of the peripheral wall 28. Ink is supplied from an ink supply unit (not shown) between the ink supply roller 30 and the doctor rod 31, and a wedge-shaped ink reservoir 32 is formed. And the ink reservoir 3
The ink No. 2 is supplied to the inner peripheral surface of the peripheral wall 28 while being measured while passing through a minute interval with the doctor rod 31 by the rotation of the ink supply roller 30 in the counterclockwise direction in FIG. Thus, the ink supply roller 30 supplies ink to the inner peripheral surface of the peripheral wall 28.

The impression cylinder 25 has the same outer diameter as the plate cylinder 24 (the cylindrical shape of the peripheral wall 28). The impression cylinder 25 is a peripheral wall 2
8 is provided at a predetermined distance from the outer peripheral surface and has an axis parallel to the central axis of the peripheral wall 28. The impression cylinder 25
It is rotatable about its own axis, and is driven to rotate in the clockwise direction in FIG. 1 in a direction opposite to the plate cylinder 24 in synchronization with the rotation of the plate cylinder 24. Further, the impression cylinder 25 rotates upon itself.
The plate cylinder 24 has a concave portion 33 for avoiding interference with the clamp plate 29 for clamping the stencil sheet M, the clamp base plate 27 and the like. In addition, the impression cylinder 25
A paper clamp unit 34 is provided for clamping (supporting) the printing paper P in a detachable manner.

Next, the paper supply section 4 has a paper supply table 36 on which the printing paper P is loaded. Printing paper P on paper feed table 36
Are taken out one by one by a paper feed roller 37 and a paper separating roller 38. The taken out printing paper P is sent to the timing roller pair 4 via the upper and lower paper guide members 39.
It is transported to the nip portion of 0. Timing roller pair 40
Sends the printing paper P to the paper biting position by the paper clamping unit 34 of the impression cylinder 25 at a predetermined timing.

Next, the paper discharge section 5 has a paper discharge pinch roller 42 that discharges and conveys the printed printing paper P by a pinch roller function in cooperation with the impression cylinder 25. Further, the paper discharge unit 5 transfers the printing paper P to the impression cylinder 25 when the impression cylinder 25 rotates.
It has a paper separating claw 43 for further separating. The printing paper P separated from the impression cylinder 25 by the paper separating claw 43 is sent out to the flying table 45 by the pair of paper ejection pinch rollers 44. The printing paper P is blown to the paper discharge board 46 by the inclination 45a of the flying board 45 and is stored in a stacked state.

The paper discharge pinch roller 42 and the paper discharge pinch roller pair 44 are arranged so as to slidably contact only the margins (non-print margins) on both sides of the printing paper P, and the ink transferred to the printing paper P therethrough. Is not reflected. Further, the rollers 42 and 44 are slidably contacted only with the margins on both sides of the printing paper P regardless of the width dimension of the printing paper P.
The position is automatically adjusted according to the size of the printing paper P set on the paper feed table 36. The size of the printing paper P is
The paper size is detected by a paper size sensor (not shown) arranged on the paper feed table 36 of the paper feed unit 4.

Next, the plate discharge section 6 has a plate discharge separation claw 48 for peeling the used stencil sheet M wound around the outer peripheral surface of the plate cylinder 24 from the plate cylinder 24. The stencil sheet M is transferred to the plate cylinder 2
When peeling the stencil sheet M from the stencil sheet M, the clamping of the stencil sheet M by the clamp plate 29 of the plate cylinder 24 is released, and the end of the stencil sheet M opened with the rotation of the plate cylinder 24 is released from the stencil separation claw 48
So that it can be caught. The stencil sheet M caught on the plate discharge separation claw 48 is further rotated by rotation of the plate cylinder 24 so that
4 is peeled off from the outer peripheral surface. Furthermore, the plate removal separation claw 4
The stencil sheet M peeled off by 8 is conveyed by a pair of plate discharging rollers 49 and stored in a plate discharging box 50.

In the stencil printing machine described above, when printing,
Opening the clamp plate 29 and rotating the plate cylinder 24,
The stencil sheet M previously used is removed from the plate cylinder 24 by the
And the plate discharge box 50 with the plate discharge roller pair 49.
Housed within. Thereafter, a series of printing operations are performed. That is, the stencil sheet M for one plate made by the plate making section 2 is conveyed to the plate cylinder 24 side. The leading end of the conveyed stencil sheet M is clamped by the clamp plate 29, and the stencil sheet M is wound around the outer peripheral surface of the peripheral wall 28 by the rotation of the plate cylinder 24 to form a plate. Next, one sheet of the printing paper P on the paper feed table 36 is taken out and transported to the nip portion of the timing roller pair 40.
Next, the timing roller pair 40 feeds the printing paper P to the paper feeding position by the paper clamping unit 34 of the impression cylinder 25 at a predetermined timing. Next, the plate cylinder 24 and the impression cylinder 25 are synchronously rotated, and the peripheral wall 28 is swelled and deformed by the ink supply roller 30, so that the stencil sheet M wound around the plate cylinder 24 is formed.
Then, the printing paper P clamped to the impression cylinder 25 is brought into pressure contact with the impression cylinder 25. Thereby, the ink that has passed through the perforated portion, which is the stencil sheet M, is transferred to the surface (one surface) of the printing paper P and printing is performed. Next, with the rotation of the impression cylinder 25, the paper clamp unit 34 releases the clamp of the printing paper P, the printing paper P is separated from the impression cylinder 25 by the paper separating claw 43, and the paper is discharged via the flying table 45. The sheet is discharged to the table 46.

FIG. 2A is a developed view of the peripheral wall, and FIG. 2B is a side sectional view in FIG. 2A. As shown in FIG. 2A, a peripheral wall 28 constituting a stencil printing plate cylinder (plate cylinder) 24 of the present invention has a rectangular developed shape, and a substantially central portion thereof has a rectangular ink passage property. An area 52 is provided. The ink-permeable region 52 is surrounded by the ink-impermeable region 53.

The peripheral wall 28 having the ink impermeable area 53 and the ink permeable area 52 surrounded by the ink impermeable area 53 can be formed by various structures. For example, the plate cylinder 24 may be formed by mainly stacking a plurality of ink-permeable flexible screens, forming a cylindrical shape, and inserting and fixing rigid disk-shaped side plates at both ends thereof. Good. In this case, a sealing material (for example, a material that is not eroded by ink such as silicon) is applied to a part of the screen by a method such as printing to form a sealed ink impermeable region 53, The unsealed ink-permeable region 52 can be formed in any shape.

In the rotational direction of the peripheral wall 28 indicated by an arrow A in FIG. 2A, a cylindrical portion is formed at the boundary between the rear end of the ink-permeable region 52 and the ink-impermeable region 53 adjacent to the same portion. An ink impermeable edge 54 is formed along the axis (generating line) of the peripheral wall 28.

As shown in FIG. 2B, the ink impermeable edge portion 54 is formed to protrude inward from the cylindrical inner peripheral surface of the peripheral wall 28. In addition, the ink impermeable edge 5
The angle formed between the portion 4 facing the ink-permeable region 52 and the ink-permeable region 52 is set to an angle that is not an obtuse angle. In the present embodiment, it is a right angle. The ink-impermeable edge portion 54 is formed, for example, by a method such as a printing method or the like on the inner peripheral surface of the cylindrical peripheral wall 28 made of a material (silicon or the like) which is not eroded by ink like the above-described filling material. It can be formed by applying. Further, the ink impermeable side edge portion 54 is preferably an elastic body.

An ink-permeable opening area 55 is formed behind the ink-permeable area 52 in the rotation direction of the peripheral wall 28 indicated by an arrow A in FIG. Open area 5
Numeral 5 is provided so as to be continuous with the ink impervious edge 54, and is formed along the generatrix direction of the peripheral wall 28 to be substantially the same as the width of the ink-permeable region 52 in the generatrix direction of the peripheral wall 28.
This opening area 55 is similar to the ink passage area 52,
In this configuration, the screen is not clogged with a sealing resin or the like.

An ink stopper sheet 56 is provided on the cylindrical outer peripheral surface of the peripheral wall 28. Ink stop sheet 5
Reference numeral 6 denotes a belt-like sheet made of a material which is not affected by ink such as polyethylene terephthalate. The ink stopper sheet 56 is attached so as to cover a range from the rear end portion of the ink-permeable area 52 to the opening area 55 via the ink-impermeable edge 54. The ink stopper sheet 56 is used to form the ink-permeable area 52 and the ink-impermeable area 53.
Filling material (silicon etc.) forming the ink impermeable area 53
Is adhered from the cylindrical inner peripheral surface of the peripheral wall 28 and penetrates into the outer peripheral surface side of the peripheral wall 28 to be bonded. Therefore, the ink stopper sheet 56 is bonded to the ink impermeable area 53 on the outer peripheral surface side of the peripheral wall 28. Further, the ink stopper sheet 56 may be adhered to the ink impermeable area 53 with a double-sided adhesive tape or another adhesive.

Further, as shown in FIG. 2A, a portion where the ink stopper sheet 56 extends over the ink impermeable edge 54 is a non-adhesive portion 57 which is non-adhesive. The non-adhesive portion 57 is formed in a cylindrical shape at the boundary between the rear end of the ink-permeable region 52 and the opening region 55 adjacent to the same in the rotation direction of the peripheral wall 28 shown by the arrow A in FIG. It is provided along the axis (generating line) of the peripheral wall 28 having the shape. Also,
The non-adhered portion 57 is located in the direction of the axis (generating line) of the peripheral wall 28.
The ink passage area 52 and the opening area 55 are formed to have the same width. The non-adhesion portion 57 in the present embodiment shown in FIG. 2A is provided continuously along the axis (generic line) of the peripheral wall 28. In addition, although not shown, the non-adhered portion 5
7 may be partially provided within the above range along the axis (generic line) of the peripheral wall 28.

The non-adhesion portion 57 is, for example, a portion that covers the ink impermeable edge 54 on the outer peripheral surface side of the peripheral wall 28 when forming the ink impermeable region 53 and the ink impermeable edge 54. The ink-permeable area 52 and the opening area 5
5, the ink stopper sheet 56 and the peripheral wall 2
8, a material such as a polyethylene sheet that is not bonded by silicon is sandwiched between them. Then, after drying the silicon, the non-adhesive portion 57 is formed by pulling out the polyethylene sheet from the ink-permeable region 52 side.
When the ink stopper sheet 56 is attached with a double-sided adhesive tape or other adhesive, the double-sided adhesive tape or other adhesive need not be applied to the portion where the non-adhesive portion 57 is to be provided.

The operation of the stencil printing plate cylinder 24 will be described below. FIG. 3A is a developed view showing the operation of the stencil printing plate cylinder at the time of printing, and FIG. 3B is a side sectional view in FIG. 3A.

As shown in FIG. 3A, a stencil sheet M is applied to the peripheral wall 28. The stencil sheet M covers the ink-permeable area 52 of the peripheral wall 28, and its rear end is on the ink stopper sheet 56 and is attached to the ink impermeable edge 54 (non-adhesive portion 57). Will be published. And
At the time of printing, the ink supply roller 30 swells and deforms the peripheral wall 28 from the front end to the rear end of the ink passage area 52 according to the rotation direction of the peripheral wall 28 indicated by an arrow A in FIG. The bulging deformation of the peripheral wall 28 is released away from the inner peripheral surface of the peripheral wall 28 at the position of the edge 54.

At the time of the printing, at the rear end of the ink-permeable area 52, a part of the ink supplied to the inner peripheral surface of the peripheral wall 28 and not used for printing leaks to the outer peripheral surface side of the peripheral wall 28. The ink that has oozed to the outer peripheral surface of the peripheral wall 28 passes through the non-adhesive portion 57 and is returned from the opening area 55 to the inner peripheral surface of the peripheral wall 28 while being blocked by the ink stopper sheet 56. Also, the ink impermeable edge 54 is
The pressing force of the ink supply roller 30 increases the pressing force at the rear end of the stencil sheet M, thereby providing a packing effect of preventing ink from leaking from the rear end of the stencil sheet M.

As described above, the stencil printing plate cylinder 24 described above is used.
Then, on the outer peripheral surface side of the peripheral wall 28, the ink stopper sheet 56
By providing the non-adhesive portion 57 in which the portion corresponding to the ink impermeable edge 54 is non-adhesive, the ink that has leaked from the rear end of the ink-permeable region 52 to the outer peripheral surface side of the peripheral wall 28 during printing can be removed. Then, it can be guided to the opening area 55 while being covered with the ink stopper sheet 56 and returned to the inner peripheral surface side of the peripheral wall 28. As a result, ink does not accumulate in the ink stopper sheet 56, and ink is prevented from flowing back to the rear end of the stencil sheet M, thereby preventing leakage.
8) Ink contamination on the outer peripheral surface and the printing paper P can be prevented.

[0042]

As described above, the stencil printing plate cylinder according to the present invention extends from the rear end of the ink-permeable area to the open area via the ink-impermeable edge on the outer peripheral surface side of the peripheral wall. The ink stopper sheet covering the area is made non-adhesive through a non-adhesive portion at a portion that covers the ink impermeable edge. Thereby, at the time of printing, the ink that has oozed to the outer peripheral surface side of the peripheral wall from the rear end of the ink-permeable region in the rotation direction of the peripheral wall is guided to the opening region by passing through the non-adhesive portion while covering with the ink stopper sheet. Since the ink is returned to the inner peripheral surface side, it is possible to prevent the ink from flowing backward to the rear end side of the stencil sheet, thereby preventing the outer peripheral surface of the peripheral wall and the ink from being stained on the printing paper.

[Brief description of the drawings]

FIG. 1 is a side view showing an example of a stencil printing apparatus provided with a stencil printing plate cylinder of the present invention.

FIG. 2A is a development view of a peripheral wall. (B) Side sectional view in FIG.

FIG. 3A is a developed view showing an operation of the stencil printing plate cylinder at the time of printing. (B) Side sectional drawing in FIG.3 (a).

FIG. 4 (a) is a development view of a peripheral wall of a conventional stencil printing plate cylinder. FIG. 4B is a side sectional view in FIG.

FIG. 5A is a developed view showing an operation of a conventional stencil printing plate cylinder at the time of printing. (B) A sectional side view in FIG.

FIG. 6 (a) is a development view showing the operation of a conventional stencil printing plate cylinder at the time of printing. (B) Side sectional drawing in FIG.6 (a).

[Explanation of symbols]

28: peripheral wall, 30: ink supply roller, 52: ink-permeable area, 53: ink-impermeable area, 54: ink-impermeable edge, 55: open area, 56: ink stopper sheet, 57: non-adhesive part , M ... stencil paper.

Claims (1)

[Claims] 1. A stencil sheet made on a cylindrical outer peripheral surface having an ink-permeable area and an ink-impermeable area surrounding the ink-permeable area so as to cover the ink-permeable area. A peripheral wall that is wound and driven to rotate around its own central axis, provided along the generatrix of the peripheral wall inside the peripheral wall, and supplies ink supplied to the inner peripheral surface of the peripheral wall from the ink passage area. An ink supply roller that passes through a stencil portion of the stencil paper wound around the outer peripheral side of the peripheral wall and is used for printing; and a rear end of the ink-permeable region in the rotation direction of the peripheral wall, along a generatrix of the peripheral wall. An ink impermeable edge formed so as to protrude from the cylindrical inner peripheral surface of the peripheral wall to divide the ink permeable area, and behind the ink impermeable edge in the rotation direction of the peripheral wall. , The ink interruption An ink-permeable opening region connected to the transient edge portion and formed along the generatrix of the peripheral wall; and a rear end portion of the ink-permeable region on the cylindrical outer peripheral surface side of the peripheral wall. An ink stopper sheet provided so as to cover a range extending to the opening area via the ink impervious edge, and a non-adhesive part in which a portion of the ink stopper sheet that covers the ink impermeable edge is non-adhered. A plate cylinder for stencil printing, comprising: