JPH09156193A - Stencil-engaging device and stencil-engaging method of stencil press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To properly and surely hold a stencil by a clamping part in a state with an end part of the stencil stretched even when the stencil is curled and fed to a stencil-engaging device in the curled state. SOLUTION: When a form plate is started to be fed, a movable clamp plate 4 is brought into a closed state or semi-closed state to receive a leading end of a stencil 21 at an outer rear face thereof. At the same time, the movable clamp plate 4 is rotated in an opening direction so that the front end of the stencil 21 received at the outer rear face of the plate 4 is raised and turned into a stretched state and moreover, the front end lands on a fixed clamp bed 5 in the stretched state. After the leading end of the stencil lands on the fixed clamp bed, the movable clamp plate 4 is rotated in a closing direction to hold the front end of the stencil between the plate 4 and the fixed clamp bed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil sheet locking device for a stencil printing machine, and more particularly, to a stencil sheet having a fixed clamp surface and a movable clamp piece on an outer peripheral surface of a rotating printing plate cylinder. The present invention relates to a base paper locking device that holds one end of the paper.

[0002]

2. Description of the Related Art Generally, in a rotary stencil printing machine, a stencil sheet is attached to an outer peripheral surface of a rotating drum-shaped plate cylinder to form a plate surface. One end of this base paper is fixed on the outer peripheral surface of the plate cylinder, and a base paper locking portion is formed on the outer peripheral surface of the plate cylinder as a structure therefor. The base paper locking device forming the base paper locking portion is disclosed in Japanese Utility Model Laid-Open No. 61-93241 or Japanese Utility Model Laid-Open No. 61-31830, or Japanese Patent Laid-Open No. 63-63.
A clamp type device described in Japanese Patent No. 306043 is known. In these clamp type stencil locking devices, a fixed clamping surface extends in the axial direction on the outer peripheral surface of the drum-shaped plate cylinder, and further, one end of the stencil is clamped between the fixed clamping surface and the fixed clamping surface. A movable clamp piece that opens and closes is formed to face the fixed clamp surface.

FIG. 8 is a diagram schematically showing the construction of the plate making section 20 for supplying the plate-made base paper to the plate cylinder provided with the base paper locking device as described above. The base paper 21 is pulled out from a base paper roll 22 that is wound in a roll shape, and is passed between a thermal head 23 and a platen roller 24 for plate making. The stencil sheet 21 thus prepared is sent through the first and second sponge rollers 25 and 26 for plate feeding, and sent to the plate cylinder 27. A guide plate 28 is provided from below the first sponge roller 25 to below the second sponge roller 26 toward the plate cylinder 27. The base paper 21 is fed from the guide plate 28 toward the leading end of the base paper 21. Locking device 30
Plate cylinder 2 so that the movable clamp 31 of the
The rotational position of 7 and the opening / closing of the movable clamp 31 are controlled. In the figure, 29 is a cutter for cutting the base paper 21.

[0004]

By the way, when the base paper is wound around a roll and is fed to the base paper locking device of the printing plate cylinder in a curled state with a curl, it comes out from the tip of the guide plate 28. The base paper 21 has a curl and bends downward as shown in FIG. In particular, conventionally, the guide plate 28 and the fixed clamp 32 have been used.
Since there is a large difference between the paper and paper, the front end of the base paper 21 tends to bend downward and become curled. Further, the clamp surface of the fixed clamp 32 is often made of a material having a large friction, such as rubber, in order to prevent the base paper from being pulled out when the base paper is held, and if the base paper 21 is continuously fed as it is, After the front end of the base paper 21 touches the clamp surface of the fixed clamp 32, the base paper 21 is damaged due to the large friction.
The tip of the clamp does not slip, and as shown in FIG.
And the movable clamp 31 are bent. If the movable clamp 31 is closed in this state, the position of the base paper 21 becomes improper with respect to the plate cylinder 27, or wrinkles tend to occur, so that the base paper 21 cannot be set in an appropriate state.

In view of the above problems, the present invention was devised to effectively solve the problems. Therefore, the purpose of the stencil plate is to be able to surely pinch between the fixed clamp and the movable clamp with the leading edge of the base paper straightened out even when the base paper has a curl when feeding to the base paper locking device. An object is to provide a base paper locking device and a base paper locking method for a printing machine.

[0006]

A base paper locking device for a stencil printing machine according to the present invention has the following constitution in order to solve the above-mentioned conventional technical problems and achieve the object. There is. That is, on the outer peripheral surface of the drum-shaped printing plate cylinder,
A fixed clamp surface extending along the axial direction of the plate cylinder and a swinging shaft that opposes the fixed clamp surface so as to be pressed against the fixed clamp surface and that swings along the axial direction of the plate cylinder. In a stencil sheet locking device of a stencil printing machine, the movable clamp piece is provided with a movable movable clamp piece, and receives the feeding of the stencil sheet drawn out from the stencil sheet from the plate making section. In the closed state or the semi-closed state so that the front end of the base paper is received by the outer back surface of the movable clamp piece, and the front end of the base paper received by the outer back surface is raised and extended, and in the extended state. Rotate in the opening direction so as to drop it to land on the fixed clamp surface, and after the tip of the base paper has landed on the fixed clamp surface, close direction to sandwich the front end of the base paper with the fixed clamp surface. Turn to It is sea urchin. The outer rear surface of the movable clamp piece is preferably a flat surface, and more preferably a low friction surface made of a low friction material such as fluororesin, polyethylene, polyester or the like.

Further, in the method of locking a stencil sheet of a stencil printing machine according to the present invention, the movable clamp piece is in the closed state or when the feeding of the stencil sheet drawn from the stencil roll to the stencil sheet starting device is started. In the semi-closed state, the step of receiving the leading edge of the plate raw paper on the outer back surface and the movable clamp piece receiving the leading edge of the plate raw paper on the outer back surface drop the raw paper in the extended state to land on the fixed clamp surface. A step of rotating in the opening direction and a step of rotating the movable paper in the closing direction so that the movable clamp piece sandwiches the front end of the base paper with the fixed clamp surface after the front end of the base paper has landed on the fixed clamp surface. And have.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A base paper locking device and a base paper locking method for a stencil printing machine according to the present invention will be described below with reference to FIGS.

FIG. 1 is a perspective view showing a plate cylinder in which a base paper locking device of a stencil printing machine according to the present invention is adopted. The direction of rotation of the plate cylinder 1 in the figure is the direction of the arrow R. At the periphery of both ends of the plate cylinder 1, there are ridges 2 projecting radially outward in a bank shape.
Are formed. Clamp part 3 as a base paper locking device
The main components are a clamp base 5 as a fixed clamp surface and a clamp plate 4 as a movable clamp piece. The opening / closing operation of the clamp unit 3 is performed by the swinging movement of the clamp plate 4 and the engagement / disengagement of the clamp table 5, and the opening / closing portion faces forward in the rotation direction of the plate cylinder 1. That is, the front end portion 19 of the clamp plate 4 that is closed is located on the leading side in the rotational direction of the plate cylinder 1.

The clamp base 5 is formed by bending a thin plate of a substantially rectangular shape formed of a magnetic material such as a steel plate so as to follow the outer peripheral surface of the plate cylinder 1, and the plate cylinder between the ridges 2 is formed. 1 is fixed to the outer peripheral surface of the No. 1 so as to extend along the axial direction thereof. Both ends of the clamp plate 4 are pivotally supported on the outer peripheral surface of the ridge 2 via the swing shaft 6. The shape of the clamp plate 4 is such that a central portion of a portion along one long side of the strip shape has a cutout portion 7 cut out slightly longer than the width dimension of the base paper. Both ends of a position along the long side including the cutout portion 7 are protruded in the longitudinal direction. The swing shaft 6 is provided with a torsion spring 8 that biases the clamp plate 4 in the closing direction. On the other hand, a rubber magnet plate 9 is attached to a surface of the clamp plate 4 facing the clamp table 5 side. As a means for driving the opening / closing operation of the clamp plate 4, a lever member 11 is fixed to one end of the swing shaft 6, and a handle-like pin portion 12 is projectingly provided at the tip of the lever member 11. On the other hand, in the fixed part 10 such as the frame of the printing machine main body,
An arm member 13 that engages with and rotates the pin portion 12 of the lever member 11 is pivotally supported. The clamp plate 4 is
The opening / closing operation is operated by the arm member 13 and the lever member 11.

FIG. 2 is a schematic view showing a plate feeding position and a plate discharging position of the base paper locking device of the present invention attached to the plate cylinder. The rotation direction of the plate cylinder 1 is the direction of the arrow R. 26 is
Sponge rollers as plate feeding rollers, and 14 and 15 are plate discharging rollers. The position where the plate feeding operation is performed is the position A in FIG. 2, and the position where the plate discharging operation is performed is the position B. Therefore, the arm member 13 for operating the opening / closing operation of the clamp plate 4 described above is provided at two positions, the A position and the B position.

The plate feeding operation will be described below. In addition,
In the following description, the configuration of the plate-making section is the same as that of the above-described conventional technique, and therefore, the same reference symbols as those used in the description of the conventional technique are given to omit redundant description. The plate cylinder 1 rotates and the clamp portion 3 reaches the position A. At this position, in the clamp portion 3, as shown in FIG. 3 or 4, the clamp plate 4 is in the closed state or the semi-closed state. The base paper 21 is sent out from the sponge roller 26, the front end of the base paper 21 hits the back surface of the clamp plate 4, and
Is sent out to some extent. The leading end of the base paper 21 has a curl of the base paper roll 22 and is fed while curving downward. When the base paper 21 is fed for a predetermined length, the clamp plate 4
As shown in FIG. 5, the upper end of the base paper 21 is raised and the clamp part 3 is rotated so as to extend the curl. As shown in FIG. 6, the leading end of the base paper 21 rides over the leading end of the clamp plate 4 and lands on the clamp base 5 in a state where the curl is extended. In this state, the base paper 21 is properly set on the clamp part 3, and the clamp part 3 is closed as shown in FIG. 7 so that the base paper 21 is placed between the clamp plate 4 and the clamp base 5. It is pinched. From this state, the rotation of the plate cylinder 1 progresses further, the base paper 21 is inverted so as to be folded back along the front end portion of the clamp plate 4, and further over the upper end surface of the clamp plate 4 and on the outer peripheral surface of the plate cylinder 1. Sticked. In this example, the rotation direction of the plate cylinder 1 is set to, for example, the counterclockwise direction in FIG. 1 so that the base paper 21 passes over the clamp plate 4 and is inverted. However, the base paper 21 is rotated in the clockwise direction without being inverted. Of course, it may be rotated.

When the clamp plate 4 is brought into the semi-closed state at the time of plate feeding, the clamp plate 4 is brought into the semi-closed state at a position where the outer back surface of the clamp plate 4 is continuous with the extension of the guide surface of the guide plate 28. Become. In this case, the position of the clamp plate 4 corresponds to the position where the base paper 21 is fed from the guide plate 28 and comes out, and the leading end of the base paper 21 comes out along the guide plate 28 and then comes to the guide plate 28. On the other hand, it slides along the outer back surface of the clamp plate 4 without any drop. The outer back surface of the clamp plate 4 is, of course, preferably a flat surface, but is coated with a low-friction material such as fluororesin or polyethylene or polyester, and the front end of the base paper 21 is against this back surface. Even if you are standing up
It has a low-friction surface that allows it to slide without getting caught.

The opening / closing operation of the clamp plate 4 as described above is
The operation of the arm member 13 is performed by the arm member 13 and the lever member 11. The operation pattern of the arm member 13 is set in the control unit (not shown) as a plate feeding mode, and the driving device such as a motor operates according to the pattern. To be done.

[0015]

According to the base paper locking device and the base paper locking method for a stencil printing machine according to the present invention, even if the leading edge of the raw paper is fed in a state in which the roll has a curl, the leading edge of the raw paper is Since the clamp plate 4 is flipped up on its back side and extended, and then clamped between the clamp base 5 and the clamp base 5, the end portion of the base paper is reliably extended and clamped by the clamp portion 3 in an appropriate state, so that the position of the plate is not displaced. No wrinkles.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a plate cylinder in which a base paper locking device of a stencil printing machine according to the present invention is adopted.

FIG. 2 is a schematic view showing a plate supply position and a plate discharge position of the base paper locking device of the present invention attached to the plate cylinder.

FIG. 3 is a schematic view showing a closed state of a clamp plate in a series of operations at a plate feeding position of a base paper locking device according to the present invention.

FIG. 4 is a schematic diagram showing a half-closed state of a clamp plate in a series of operations at a plate feeding position of a base paper locking device according to the present invention.

FIG. 5 is a schematic view showing a raised state of the base paper of the clamp plate in a series of operations at the plate feeding position of the base paper locking device according to the present invention.

FIG. 6 is a schematic view showing a state in which the base paper is stretched and landed on the clamp base after the base paper raising operation of the clamp plate in a series of operations at the plate feeding position of the base paper locking device according to the present invention.

FIG. 7 is a schematic view showing a state where the base paper is clamped by the clamp plate and the clamp base in a series of operations at the plate feeding position of the base paper locking device according to the invention.

FIG. 8 is a schematic diagram showing a schematic configuration of a plate making unit that performs a plate feeding operation with respect to the base paper locking device.

FIG. 9 is a schematic diagram illustrating a base paper locking operation in a base paper locking device of a conventional technique.

FIG. 10 is a schematic diagram for explaining a base paper locking operation in a base paper locking device of a conventional technique.

[Explanation of symbols]

 1 plate cylinder 2 ridges 3 clamps 4 clamp plates as movable clamp pieces 5 clamp bases as fixed clamp surfaces 6 swing shafts 7 cutouts 8 torsion springs 9 rubber magnet plates 10 fixed parts 11 lever members 12 pin parts 13 Arm Member 14 Plate Ejection Roller 15 Plate Ejection Roller 19 End Side of Clamp Plate 21 Base Paper 26 Sponge Roller for Plate Supply 28 Guide Plate

Claims (4)

[Claims] 1. A fixed clamping surface extending on the outer peripheral surface of a drum-shaped printing plate cylinder (1) along the axial direction of the plate cylinder.
(5) and a swing shaft facing the fixed clamp surface so as to be pressed against the fixed clamp surface and along the axial direction of the plate cylinder
A stencil printer base paper which is provided with a movable clamp piece (4) swingable around (6), and receives from the plate making section (20) the feed of the base paper drawn out from the base paper roll (22) and made into a plate. In the locking device, the movable clamp piece is in a closed state or a semi-closed state so that the front end of the plate raw paper is received by the outer rear surface of the movable clamp piece at the start of plate feeding, and the front end of the raw paper received by the outer rear surface is raised. After the tip of the base paper lands on the fixed clamp surface, the tip of the base paper lands on the fixed clamp surface so that it is raised and extended, and in the extended state, it is dropped to land on the fixed clamp surface. A base paper locking device for a stencil printing machine, characterized in that the base paper is rotated in a closing direction so as to be clamped between a front end of the base paper and a fixed clamp surface. 2. The outer rear surface of the movable clamp piece (4) is
The base paper locking device for a stencil printing machine according to claim 1, which is made of a low friction material such as fluororesin, polyethylene, polyester or the like. 3. The outer rear surface of the movable clamp piece (4) is
The base paper locking device for a stencil printing machine according to claim 1 or 2, which is a flat surface. 4. The movable clamp piece (4) is in a closed state or a semi-closed state at the time of starting the feeding of the base paper (21) drawn out from the base paper roll (22) to the base paper locking device from the plate making section (20). In the state, the step of receiving the leading edge of the plate raw paper (21) on its outer back surface, and the movable clamp piece that received the leading edge of the plate raw paper on the outer back surface landed on the fixed clamp surface (5) with the original paper stretched. The step of rotating in the opening direction so as to drop it, and, after the leading edge of the raw paper has landed on the fixed clamp surface, the movable clamp piece closes the leading edge of the raw paper in the closing direction so as to clamp it between the fixed clamp surface. And a step of rotating to a stencil printing press.