JP2709253B2 - Stencil clamp device for stencil printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine for a stencil printing machine.

[0002]

2. Description of the Related Art A heat-sensitive stencil sheet used in a stencil printing machine includes a very thin thermoplastic synthetic resin film such as polyester (hereinafter simply referred to as "film") and a porous flexible support. It has a laminated structure in which synthetic fibers, Japanese paper, or a mixture of Japanese paper and synthetic fibers are laminated as a body. The stencil printing machine performs perforation making on the film by a heating element such as a thermal head on the base paper, and automatically conveys the base paper and automatically winds the base paper on the outer peripheral surface of the porous cylindrical plate cylinder. Pressing means such as a press roller continuously presses the printing paper against the base paper, and printing is performed by bleeding ink from an opening provided in the plate cylinder and a perforated part of the base paper.

[0003] The base paper used for the above-mentioned applications uses Japanese paper or the like as a support, so that the passage of the ink at the portion where the Japanese paper fibers are entangled is inhibited, and the ink does not transfer to the printing paper. There is a problem that a fiber pattern appears or fine lines are blurred. Therefore, it is possible to prevent the occurrence of fibrous grains by printing on base paper consisting of only a film without using Japanese paper or the like as a support, but the thickness of the film itself is about 1 to 1. About 2 μm, about 20 times smaller than the thickness of Japanese paper laminate base paper of about 40 to 50 μm.
Very thin, and the film material itself is a highly insulating material.It is easily charged with static electricity, and wraps around or sticks to transport rolls. There is a problem.

Conventionally, there is no full-scale technique for solving the above-mentioned problem, but as shown in Japanese Utility Model Publication No. 1-26463, for example, a clamp piece and a reinforcing paper piece portion are provided. The stage part to be joined with the headless printing base paper not joined is magnetically attracted selectively. With this magnetic attraction, the printing base paper is sandwiched between the clamp piece and the stage part, and the printing plate cylinder There has been proposed a method of locking a printing base paper.

[0005]

However, in the prior art, when the base paper has a strong stiffness, when the base paper is clamped by the clamper, the stiffness of the base paper is increased even if the base paper is conveyed in a slightly wavy state. When it is stretched,
The slack is gradually relaxed and absorbed when being wound around the plate cylinder, thereby preventing the occurrence of wrinkles and the like. However, when the stiffness of the stencil paper is weak, such as stencil paper made of only a film carrier, the strength of both sides is lower than that of the center part of the stencil paper. When the both ends hang down, the leading ends of both sides are delayed as compared with the central portion, and there is a problem that when they are clamped, they are not flatly clamped and vertical wrinkles and horizontal wrinkles are generated at the time of winding.

Accordingly, in order to solve the above-described problems, the present invention can reliably lock the clamp means even when a base paper made of only a film alone is used, and further, does not generate wrinkles. An object of the present invention is to provide a base paper clamping device for a printing device.

[0007]

According to the present invention, there is provided a stencil printing machine with a clamper device, which includes a pedestal extending along one generatrix of an outer peripheral surface of a porous cylindrical plate cylinder, and an outer peripheral surface facing the pedestal. A stencil clamping device for a stencil printing machine having a clamp slidably disposed at a position where the stencil is formed, and a clamp for clamping the stencil sheet with the pedestal. An elastic member for providing a frictional force in a direction of pulling outward is provided.

[0008]

According to the present invention, the stencil sheet comes into contact with the elastic member provided on the clamper or the pedestal during the clamping operation,
The elastic member is deformed while the clamper is pressed against the pedestal, is locked while applying a frictional force in a direction of pulling both sides of the stencil sheet outward, and is wound around the plate cylinder.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a porous cylindrical plate cylinder. The plate cylinder 1 is rotatably supported around a rotation center axis also serving as an ink pipe 8, and is rotationally driven in the direction of an arrow by a motor (not shown). A pedestal 5 made of a magnetic material is provided along a generatrix on the outer peripheral surface of the plate cylinder 1.

A clamper 2 having a magnet 3 is arranged on a portion of the outer peripheral surface of the plate cylinder 1 facing the pedestal 5. The clamper 2 is swingably supported by a pivot 4 parallel to the pedestal 5. The clamper 2 makes a plate by a plate making device (not shown), and clamps the stencil sheet 6 conveyed by a feed roller pair 7 with the pedestal 5. Elastic members 12 that apply frictional force to pull both sides of the preplated stencil 6 outward are provided at both ends of the surface that contacts the preplated stencil 6. Elastic member 1
Numeral 2 is made of a high friction member, and is raised while gradually tilting outward in a direction parallel to the pivot 4. Here, the stencil clamping device 100 mainly includes a pedestal 5, a clamper 2, a magnet 3, and an elastic member 12.

On the outer peripheral surface of the plate cylinder 1, a stencil sheet (not shown) is wound. Inside the plate cylinder 1, an ink roller 9 for supplying ink to the inner peripheral surface of the plate cylinder 1 is arranged in parallel with the ink roller 9 with a slight gap. A doctor roller 10 to be formed;
An ink pipe 8 for supplying ink to the ink reservoir 11 is arranged. Here, the ink roller 9, the doctor roller 10, and the ink pipe 8 constitute an ink supply device. In the vicinity of the lower side of the outer peripheral surface of the plate cylinder 1 facing the ink roller 9, a press roller 16 that presses and separates from the plate cylinder 1 that presses printing paper against the plate cylinder 1 is arranged.

A plate discharging section 200 is disposed below the feed roller pair 7. The plate discharging section 200 includes a plate discharging box 13 for storing used base paper (not shown) peeled from the outer peripheral surface of the plate cylinder 1 and a used base paper (not shown).
And a pair of plate discharge rollers 15a and 15b for transferring used base paper (not shown) peeled off by the plate discharge claw 14 into the plate discharge box 13.
And

A paper discharge unit 300 is provided below the plate discharge unit 200. The paper discharge unit 300 includes a paper discharge tray 17 on which printed print papers are sequentially stacked, and a peeling claw 18 disposed near the plate cylinder 1 and peeling the printed print paper (not shown) from the plate cylinder 1. Have.

Next, the operation of the stencil printing machine will be described below. In FIG. 1, the plate cylinder 1 is stopped at a predetermined plate feeding position with the clamper 2 opened. The prepressed stencil paper 6 conveyed from a plate making device (not shown) is inserted between the pedestal 5 and the magnet 3 by a feed roller pair 7.

Next, at a predetermined timing, a clamper opening / closing device (not shown) is operated to close the clamper 2, so that the leading end of the prepressed stencil 6 is held between the magnet 3 and the pedestal 5. At the time of the clamp closing operation, the prepressed stencil 6 comes into contact with the elastic member 12 provided on the clamper 2, and the elastic member 12 is deformed while being pressed against the pedestal 5, and pulls both ends of the preformed stencil 6 outward. It is locked while being given a frictional force and wound around a plate cylinder. At the same time when the clamping operation is completed, the plate cylinder 1 is rotated in the direction of the arrow, so that the stencil sheet 6 is wound around the outer peripheral surface of the plate cylinder 1.

When the pre-printed base paper 6 is wound around the plate cylinder 1 for a predetermined length, the pre-printed base paper 6 is cut by cutter means (not shown).
Is cut off, and the rotation of the feed roller pair 7 stops. After cutting the prepressed stencil 6 in this manner, the prepressed stencil 6 is wound around the outer peripheral surface of the plate cylinder 1, and the printing process is started.

First, one sheet of printing paper (not shown) is fed between the plate cylinder 1 and the press roller 16 at a predetermined timing synchronized with the rotation of the plate cylinder 1 by a paper feeding device (not shown). Is inserted. Then, the press roller 16 separated from the outer peripheral surface of the plate cylinder 1 moves upward,
When printing paper (not shown) is pressed onto the pre-made stencil 6 wound on the outer peripheral surface of the plate cylinder 1 rotating in the counterclockwise direction, ink is printed from the perforated portion of the stencil 6. No) is transferred to the surface and printed. At this time, the ink roller 9 also rotates in the same direction as the rotation direction of the plate cylinder 1, and supplies ink to the inner peripheral surface of the plate cylinder 1. Then, the printed printing paper (not shown) is peeled off by the peeling nail 18.
As a result, the sheet is separated from the outer peripheral surface of the plate cylinder 1 and discharged to the paper discharge tray 17, and the printing of the first sheet ends the so-called printing. Next, a predetermined number of prints are sequentially and continuously performed by the same operation as the above operation.

When printing is completed and the image of the next document is to be printed, the previously used used paper (not shown) must be used before newly making the preprinted base paper 6 around the outer peripheral surface of the plate cylinder 1. It peels off from the outer peripheral surface of the plate cylinder 1. At this time, the plate cylinder 1 is rotated in the clockwise direction, the plate discharge claws 14 approach the outer peripheral surface of the plate cylinder 1, and the used base paper (not shown) is peeled from the rear end. The used base paper (not shown) that has been peeled off is conveyed into the plate discharge box 13 by the plate discharge roller pairs 15a and 15b and discharged. Thereafter, the plate cylinder 1 stops at a fixed position, opens the clamper 2 and enters a plate supply standby state.

As described above, according to the embodiment shown in FIG. 1, as shown in FIG. 8, the prepressed stencil 6 comes into contact with the elastic member 12 provided on the clamper 2 during the clamp closing operation. While being pressed against the pedestal 5, the elastic member 12 is
The elastic member 1 is deformed from the position indicated by the two-dot chain line to the position indicated by the solid line).
When the second end 12a moves over the distance ΔL, it is locked while giving a frictional force to move both ends of the leading end of the stencil sheet 6 outward in a direction parallel to the pivot 4 by 2ΔL. . Therefore, the leading edge of the pre-plated base paper 6 is corrected during the clamping operation even if the leading end of the pre-plated base paper 6 is conveyed to the kamaboko mold as described above, so that no wrinkles or the like are generated when the plate cylinder is wound.

FIGS. 2, 3 and 4 show another embodiment. The stencil clamping device 110 shown in this embodiment is different from the embodiment shown in FIG. 1 in that the magnet 3 is constituted by a rubber magnet, a plastic magnet, or the like. The only difference is a configuration in which an elastic member 121 that applies a frictional force that pulls the portion in the direction of diverging with respect to the transport direction of the plate-making base paper 6 is formed integrally with the magnet 3 (see FIG. 3). In this embodiment, as shown in FIG. 3, both ends of the prepressed stencil sheet 6 are pulled in the arrow X direction and the arrow Y direction, respectively, thereby preventing wrinkles of the prepressed stencil sheet 6 from being wound when the plate cylinder is wound. it can.

FIGS. 5A and 5B show still another example of the elastic member 122. FIG. As shown in FIG. 5A, the elastic member 122 is made of metal or the like,
a is fixed to the clamper 2 of the concave portion 19 provided at both ends of the contact surface between the magnet 3 and the pre-made raw paper 6, and its free end 122 b is locked to the side surface of the magnet 3 of the concave portion 19. The contact surface of the elastic member 122 with the stencil sheet 6 is the lower surface 3a of the magnet 3.
A high friction member 20 is provided on a surface of the elastic member 122 which is protruded further downward and in which the elastic member 122 comes into contact with the stencil sheet 6. As the high friction member 20, a rubber material having a high coefficient of friction, abrasive grains adhered to a surface that comes into contact with the plate-making base paper 6 with an adhesive or the like is used. As shown in FIG. 5 (b), when the clamper 2 is closed, the elastic member 122
, And applies a frictional force to the plate-making stencil 6 in the direction of arrow Z. Since the elastic member 122 pulls both ends of the pre-made base paper 6 outward, it is possible to prevent wrinkles of the pre-made base paper 6 when the plate body is wound.

The elastic member 12 shown in FIGS.
The base 2 has its base end 122a fixed to the clampers 2 of the concave portions 19 provided at both ends of the contact surface between the magnet 3 and the pre-processed stencil 6, and its free end 122b projects below the lower surface 3a of the magnet 3. And is formed in a substantially L-shape by metal or the like. A high friction member 20 is provided on a surface of the elastic member 122 that comes into contact with the plate-making base paper 6. As shown in FIG. 6B, similarly to the example shown in FIG. 5 described above, when the clamper 2 is closed, the elastic member 122 is deformed outwardly of the pre-processed base paper 6, and A frictional force is applied to pull in the direction of arrow Z. By pulling both ends of the plate-making base paper 6 outward, it is possible to prevent wrinkles of the plate-making base paper 6 when the plate body is wound.

The elastic member 12 shown in FIGS.
The base 2 has its base end 122a fixed to the magnet 3 of the concave portion 19 provided at both ends of the contact surface between the magnet 3 and the pre-processed stencil 6, and its free end 122b projects below the lower surface 3a of the magnet 3. And made of metal or the like. Elastic member 12
A high friction member 20 is provided on the surface of the plate 2 that comes into contact with the pre-made base paper 6. As shown in FIG. 7B, similar to the example shown in FIGS. 5 and 6, when the clamper 2 is closed,
The elastic member 122 is deformed outwardly of the prepressed stencil 6 and applies a frictional force to the prepressed stencil 6 in the direction of the arrow Z. By pulling both ends of the plate-making base paper 6 outward, it is possible to prevent wrinkles of the plate-making base paper 6 when the plate body is wound.

In each of the above embodiments, the clamper 2 is swingably supported by the pivot 4 parallel to the pedestal 5. However, the clamper 2 projects outwardly from both corners of the rectangular clamper plate and projects outwardly from the pedestal 5. It may be swingably supported by a pair of parallel projections. Further, the clamper 2 may be configured by disposing a clamper plate provided so as to be movable toward and away from the pedestal 5 in parallel with the pedestal 5 at a position facing the pedestal 5.

In each of the above embodiments, the clamper 2 has the magnet 3, but the magnet 3 is omitted, and the clamper 2 is urged toward the pedestal 5 by an urging means such as a spring. The leading end of the pre-processed stencil paper 6 may be held between the clamper 2 and the pedestal 5 closed by the urging force.

Although the elastic member of the base paper clamping device according to the present invention is provided on the magnet 3 side of the clamper, it may be provided on both ends of the contact surface of the pre-made base paper 6 on the pedestal 5 side.

[0027]

As described above, according to the present invention, elastic members are provided at both ends of the base paper contact surface of the clamper or the pedestal to apply a frictional force in a direction to pull both sides of the pre-made base paper outward. When the pre-processed base paper is transported, both ends of the pre-processed base paper hang down, and even when conveyed to a kamaboko type, the frictional force that pulls outward during the clamping operation is applied and corrected, so that wrinkles are generated when the plate body is wound. It does not occur and is securely locked to the base paper clamp device.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a stencil clamping device of a stencil printing machine showing one embodiment of the present invention.

FIG. 2 is a cross-sectional view of a stencil clamping device of a stencil printing machine showing another embodiment of the present invention.

FIG. 3 is a plan view of a main part of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 3 ;

FIG. 5A is a sectional view of a main part of an elastic member according to another embodiment of the present invention. FIG. 6B is a diagram illustrating the operation of the elastic member in FIG.

FIG. 6A is a sectional view of a main part of an elastic member showing still another embodiment of the present invention. FIG. 7B is a view for explaining the operation of the elastic member shown in FIG.

FIG. 7A is a sectional view of a main part of an elastic member showing still another embodiment of the present invention. FIG. 8B is a view for explaining the operation of the elastic member of FIG.

FIG. 8 is a diagram illustrating the operation of an elastic member.

[Explanation of symbols]

 Reference Signs List 1 plate cylinder 2 clamper 3 magnetic body 4 pivot 5 pedestal 6 stencil sheet 9 ink roller 12, 122 elastic member

Claims (1)

(57) [Claims] 1. A pedestal extending along one generatrix of an outer peripheral surface of a porous cylindrical plate cylinder, and a slidably disposed part of the outer peripheral surface opposing the pedestal. In the stencil clamping device of a stencil printing machine having a clamper for holding the stencil sheet, a friction force in a direction of pulling both sides of the stencil sheet outward is applied to both ends of the stencil contact surface of the clamper or the pedestal. A stencil clamping device for a stencil printing machine, characterized in that a stencil member is provided.