JPH08142479A - Rotary type stencil printing device - Google Patents

Abstract

PURPOSE: To reduce the number of parts and fabrication man-hours, and also reduce manufacturing costs by joining two sheets of screens, folding them in the vicinity of the joined part to be wrapped on the plate cylinder in a superimposed state, inserting a support member into the folded part, and pulling it by a springed wire to be secured on the plate cylinder. CONSTITUTION: The rotary type stencil printing device includes a cylindrical plate cylinder 2, and the plate cylinder includes a peripheral wall 3 having a printing area 3a through which ink passes and non-printing area 3b through which ink never passes. In this instance, the outer peripheral surface of the peripheral wall 3 is wrapped with two sheets of screens in superimposed relation to shield the printing area 3a of the peripheral wall 3. Both the screens 4 are folded to be superimposed with each other in the longitudinal direction near the joined part 6 to then be mounted on the printing area 3a of the plate cylinder 3. Furthermore, the inside of the folded parts of the screens 4, 5 are provided with a support member 8, and the engaging grooves 8a of both the end parts of the support member 8 are attached respectively with one end of wire 10. The wire 10 acts to pull the end part of the support member 8 in the direction opposite to the rotational direction D of the plate cylinder 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary stencil printing machine having a cylindrical plate cylinder on which a stencil sheet is mounted and which rotates.

[0002]

2. Description of the Related Art A rotary stencil printing machine has a cylindrical plate cylinder that is driven to rotate about its own central axis. At least a part of the peripheral wall of the plate cylinder is a printing area having ink permeability. Ink supply means for supplying ink to the inner surface of the peripheral wall is provided inside the plate cylinder.

On the outer peripheral surface of the plate cylinder, a plurality of screens for allowing ink to pass are stacked and wound. The ink supplied to the inner peripheral surface of the plate cylinder by the ink supply means is appropriately dispersed through these screens,
The amount required for printing stays on the printing surface on the plate cylinder. For example,
In the printing apparatus disclosed in Japanese Utility Model Laid-Open No. 60-166546, two screens are wound around the plate cylinder. The front ends of the screens in the rotational direction of the plate cylinder are integrally fixed to the plate cylinder, and the rear end of each screen is attached to the plate cylinder via an elastic member.

On the outer peripheral surface of the plate cylinder, a stencil printing base paper that has been made is wound. The printing paper is supplied in synchronization with the rotation of the plate cylinder, and the pressing means such as a pressing roller presses the printing paper against the plate cylinder to perform printing.

[0005]

The conventional rotary stencil printing machine as described above has a problem that the number of parts for mounting the screen on the plate cylinder is large.
The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a rotary stencil printing machine capable of attaching a screen to a plate cylinder with a small number of parts.

[0006]

A rotary stencil printing machine according to a first aspect of the present invention is provided with a peripheral wall having a printing region through which ink passes and a non-printing region through which ink does not pass, and an inner peripheral surface of the peripheral wall. A cylindrical plate cylinder having an ink supply means for supplying ink, a screen that is folded back and overlapped on the peripheral surface of the plate cylinder, and a screen provided inside the folded part of the overlapped screen. A support member and a first member for fixing each end of the screen to the plate cylinder side at the start end side of the printing region in the rotation direction of the plate cylinder.
Fixing means, and second fixing means for attaching the supporting member to the plate cylinder by urging the support member in a direction opposite to the rotation direction of the plate cylinder at the end side of the printing area in the rotation direction of the plate cylinder. It is characterized by doing.

A rotary stencil printing machine according to a second aspect is the rotary stencil printing machine according to the first aspect, characterized in that the screen is composed of two screens connected at one end to each other. .

A rotary stencil printing apparatus according to a third aspect of the present invention is the rotary stencil printing apparatus according to the second aspect, wherein the connecting portion of the two screens is impermeable to ink and the connecting portion is the impermeable portion. It is characterized in that it is in contact with the end portion of the printing area of the plate cylinder.

[0009]

In the rotary stencil printing machine according to the present invention, the two screens are integrally connected at one end thereof. The screen is folded back at the connected portion or in the vicinity thereof, and is wrapped around the peripheral surface of the plate cylinder. The other ends of the two connected screens are fixed to the plate cylinder at the start end side of the printing area. A support member is provided inside the folded portions of the two screens. The support member is biased in a direction opposite to the rotation direction of the plate cylinder and is fixed to the plate cylinder at the end side of the printing area. Therefore, the screen is pulled in the circumferential direction of the plate cylinder and attached to the peripheral surface of the plate cylinder with a predetermined tension.

In the rotary printing apparatus according to the third aspect of the invention, particularly, the connecting portion of the two screens is impermeable to ink, and the connecting portion abuts on the end portion of the printing area of the plate cylinder. Ink does not easily leak to non-printed areas.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary type stencil printing machine according to a first embodiment will be described with reference to FIGS. This rotary stencil printing machine 1
It has a cylindrical plate cylinder 2. The plate cylinder 2 is driven by a driving unit (not shown) and rotates about its own central axis. The arrow D in the figure indicates the direction of rotation of the plate cylinder 2. The plate cylinder 2 has a peripheral wall 3 having a printing area 3a through which ink passes and a non-printing area 3b through which ink does not pass.

On the outer peripheral surface of the peripheral wall 3, two screens 4,
5 are overlapped and wound, and cover the printing region 3 a of the peripheral wall 3. Although the two screens 4 and 5 are ink permeable, they have different mesh roughness. Both screens 4 and 5 whose longitudinal direction is the circumferential direction of the plate cylinder 2 are integrally attached with silicone at each one end portion of each longitudinal direction. The portion where both screens 4 and 5 are attached is hereinafter referred to as a connecting portion 6.

As shown in FIGS. 1 and 2, the integrated screens 4 and 5 are bent in the longitudinal direction in the vicinity of the connecting portion 6 and overlapped with each other, and are mounted on the printing area 3a of the plate cylinder 2. . First, as shown in FIGS. 3 and 4, the other ends 4b and 5b of both screens 4 and 5 are wound around a fixing plate 7 which is a first fixing means. The fixing plate 7 is an elongated rectangular plate material, and both ends of the fixing plate 7 project laterally from both side edges of the wound screens 4 and 5. Both ends of the fixed plate 7 are fixed to the peripheral wall 3 of the plate cylinder 2 at the start end side of the printing region 3a in the rotation direction of the plate cylinder 2. The fixing plate 7 to which the screens 4 and 5 are attached is fixed to the plate cylinder 2 so that the longitudinal direction thereof is parallel to the generatrix of the plate cylinder 2.

Next, as shown in FIG. 2, a support member 8 is provided inside the folded portions of the two screens 4 and 5. The support member 8 is an elongated rectangular plate material,
Both ends thereof are projected laterally from both side edges of the folded screen (in this embodiment, one screen 5 that is located outside in the printing area 3a). Locking grooves 8a are formed at both ends of the supporting member 8 protruding laterally.

Two locking portions 9a and 9b are formed at both edges of the peripheral wall 3 of the plate cylinder 2 on the end side of the printing region 3a in the rotation direction of the plate cylinder 2. At both edges of the plate cylinder 2, each of the two locking portions 9a, 9a
b are arranged in the circumferential direction of the plate cylinder 2. With the screens 4 and 5 properly mounted on the plate cylinder 2, the two locking portions 9
A and 9b are located on both sides of each end of the support member 8 in the circumferential direction of the plate cylinder 2.

As shown in FIG. 2, one end of a wire 10 which is a linear member is attached to the locking grooves 8a at both ends of the support member 8 as a second fixing means. Each wire 10 pulls the end portion of the support member 8 in the direction opposite to the rotation direction of the plate cylinder 2. The wire 10 is wound around one locking portion 9a and the other end is locked to the other locking portion 9b. Each wire 10 between the two locking portions 9a and 9b is provided with a spring 11 as an urging means, and a force for pulling the support member 8 in a direction opposite to the rotation direction D of the plate cylinder 2 is applied to both wires. It is given to 10, 10.

As described above, at the end side of the printing area 3a in the rotation direction D of the plate cylinder 2, the supporting member 8 is the second member.
The wire 10, which is a fixing means, is pulled in the direction opposite to the rotation direction D of the plate cylinder 2, whereby the screens 4 and 5 are attached to the peripheral surface of the plate cylinder 2 with a predetermined tension.

As shown in FIG. 1, a resin sheet 12 is provided at the boundary between the printing area 3a and the non-printing area 3b on the terminal side of the printing area 3a in the rotation direction D of the plate cylinder 2. The base end portion 12a of the resin sheet 12 has a non-printed area 3
The free end 12b is fixed to the printing area 3b.
It covers the end of a. The resin sheet 12 prevents unnecessary ink from coming out from the inside of the plate cylinder 2.

As shown in FIG. 1, the connecting portions 6 of the screens 4 and 5 mounted on the plate cylinder 2 are in contact with the front surface of the resin sheet 12. The ink impermeable connecting portion 6 hardened by silicone is the tip portion 12 of the resin sheet 12.
It is in contact with the upper surface of b. Therefore, ink spillage at the end of the printing area 3a is more reliably prevented.

Inside the plate cylinder 2 constructed as described above, as shown in FIG. 5, ink supply means 15 for supplying ink to the inner peripheral surface of the peripheral wall 3 is provided. On the outer peripheral surface of the non-printing area 3b of the plate cylinder 2, a pedestal 16 and a locking means 17 for locking the front end of the stencil printing base paper M on the pedestal 16 are provided. Below the plate cylinder 2, a press roller 18 which can be raised and lowered is provided.

The front end portion of the stencil printing base paper sheet M, which has been plate-made, is fixed to the base 16 of the plate cylinder 2 by the locking means 17. The plate cylinder 2 is rotated to wind the stencil sheet M on the outer peripheral surface of the screen 5. The plate cylinder 2 and the press roller 1 are synchronized with the rotation of the plate cylinder 2.
When the printing paper P is fed during 8, the press roller 18 moves up at a predetermined timing and presses the printing paper P against the stencil printing base paper M on the peripheral surface of the plate cylinder 2. The ink passes through the peripheral wall 3 of the plate cylinder 2 and the screens 4 and 5, and further transfers to the printing paper P through the perforated image portion of the stencil printing base paper M to form a printed image.

According to this embodiment, the two screens 4,
5 are integrally connected at each one end in the longitudinal direction, bent in the vicinity of the connecting portion 6 and overlapped and wound around the plate cylinder 2. And the other ends 4b, 5b of the screens 4, 5
Was fixed to the plate cylinder 2, the supporting member 8 was inserted into the bent portion, and the supporting member 8 was attached to the plate cylinder 2 by pulling the supporting member 8 with a wire 10 having a spring. That is, although the plurality of screens 4 and 5 are used, the bent portion side is attached to the plate cylinder 2 by one support member 8. The number of parts is smaller than before, the number of assembly steps is reduced, and the manufacturing cost is reduced.

FIG. 6 shows a part of the second embodiment. The parts not shown are the same as in the first embodiment. In this embodiment, one locking portion 20 is formed on each of both edges of the peripheral wall 3 of the plate cylinder 2 on the end side of the printing region 3a in the rotation direction D of the plate cylinder 2. At both edges of the plate cylinder 2, each one locking portion 20 is located rearward of the support member 8 in the rotation direction of the plate cylinder 2.

As shown in FIG. 6, both ends of one wire 21, which is a linear member, are attached to the locking grooves 8a at both ends of the support member 8 as the second fixing means. . The wire 21 is wound around the locking portions 20, 20. Each wire 21 between the two locking portions 20, 20 is provided with a spring 22 as an urging means to pull the end of the support member 8 in the direction opposite to the rotation direction D of the plate cylinder 2. . According to this embodiment, the numbers of the wires 21, the locking portions 20, and the springs 22 can be reduced as compared with the first embodiment. Further, since the tensile force is applied to the support member 8 by the single wire 21 and the spring 22, the screens 4 and 5 can be stretched on the plate cylinder 2 with more uniform tension.

FIG. 7 shows a part of the third embodiment. The parts not shown are the same as in the first embodiment. In this embodiment, the round bar 30 is the first fixing means for fixing the screens 4 and 5 to the plate cylinder 2 at the start end side of the printing area 3a. According to this embodiment, when the stencil sheet M is mounted on the plate cylinder 2,
Since the stencil printing base paper M contacts the round bar 30, wrinkles are less likely to occur. The first fixing means may be a rod having an elliptical cross section in addition to the round rod 30, or a round rod or a rod having an elliptical cross section may be fixed to the upper surface of the fixing plate 7 of the first embodiment. It may be one.

In each of the embodiments described above, the press roller 18 moves up and down with respect to the plate cylinder 2 rotating at a predetermined position, and the printing paper P is sandwiched between the press roller 18 and the plate cylinder 2. . However, the present invention is not limited to the rotary stencil printing machine having such a structure. For example, a press roller and a plate cylinder are provided at predetermined positions with a predetermined gap therebetween, and an ink supply device in the plate cylinder presses the plate cylinder to bulge it outward to press the printing paper P. The present invention can also be applied to a rotary stencil printing machine configured to perform printing by being sandwiched between a roller and the roller. Also,
The present application is not limited to the case of using two screens having different mesh roughness. For example, one long screen may be folded back at the center and attached to the plate cylinder in the same manner as in the above embodiment.

[0027]

According to the first and second aspects of the invention, the number of parts for mounting the folded and overlapped screen on the plate cylinder can be reduced as compared with the conventional case. According to the invention of claim 3, the connecting portion of the two screens prevents ink from leaking at the boundary between the printing region and the non-printing region of the plate cylinder.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment.

FIG. 2 is a diagram viewed from the direction of arrow A in FIG.

FIG. 3 is a sectional view of the first embodiment.

FIG. 4 is a view as seen from the direction of arrow B in FIG.

FIG. 5 is a sectional view showing the overall configuration of the first embodiment.

FIG. 6 is a partial view of the second embodiment.

FIG. 7 is a partial view of a third embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Rotary type stencil printing machine 2 Plate cylinder 3a Printing area 3b Non-printing area 3 Peripheral wall 4,5 Screen 6 Connecting part 7 Fixing plate which is a first fixing means 8 Supporting members 9a, 9b, 20 Locking part as fulcrum 10 , 21 Wires as linear members that are second fixing means 11, 22 Spring 15 Ink supplying means 30 Round bar as first fixing means

Claims (3)

[Claims] 1. A cylindrical plate cylinder having a peripheral wall provided with a printing area through which ink passes and a non-printing area through which ink does not pass, and an ink supply means for supplying ink to an inner peripheral surface of the peripheral wall, and a folding back. A screen that is wound around the peripheral surface of the plate cylinder so as to be wound around it, a support member that is provided inside the folded portion of the screen that is overlapped, and at the start end side of the printing area with respect to the rotation direction of the plate cylinder. First fixing means for fixing each end portion of the screen to the plate cylinder side, and the support member on the end side of the printing region in the rotation direction of the plate cylinder in the direction opposite to the rotation direction of the plate cylinder. A rotary stencil printing apparatus comprising: a second fixing unit that is biased to be attached to the plate cylinder. 2. The screen comprises two screens connected at one end to each other.
The rotary stencil printing machine described. 3. The rotary stencil printing machine according to claim 2, wherein the connecting portion between the two screens is impermeable to ink, and the connecting portion abuts on the end portion of the printing area of the plate cylinder.