JP3297709B2 - 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 having a stencil master in which a stencil master supply / discharge unit is integrated.

[0002]

2. Description of the Related Art FIG. 5 schematically shows the structure of a stencil making and printing apparatus proposed in Japanese Patent Application Laid-Open No. 62-73987, in which a stencil making apparatus and a printing apparatus are integrated. This apparatus includes a plate supply / discharge unit 81 near a peripheral wall portion 80a of a plate cylinder 80.
Numeral 1 can rotate relatively to the peripheral wall portion 80a of the plate cylinder 80. The plate supply / discharge unit 81 has a master supply unit 83 for winding and accommodating a stencil master 82, a platen roller 84, a thermal head 85, and a plate discharge winding unit 86 for winding up a used master. In addition, a part 80b of the peripheral wall portion 80a of the plate cylinder 80 is configured to be ink-permeable, so that the ink supplied from the ink supply means 87 is supplied to printing paper (not shown) therefrom. I have.

[0003]

However, in the stencil making and printing apparatus described in the above publication, when the used master is wound on the stencil discharge winding unit 86, the ink adhering to the used master is discharged from the stencil winding roll. However, there is a problem in that the side of the sheet feeding and discharging unit 81 becomes large due to the protruding portion being contaminated and the diameter of the plate discharging take-up roll being increased. In addition, since the ink attached to the used master is discarded together with the used master, the amount of used ink is wasted.

[0004] A first object of the present invention is to provide a stencil printing machine which eliminates the above-mentioned disadvantages due to the protrusion of ink adhering to a used master and prevents the plate feeding / discharging unit from being enlarged. It is in. Also,
A second object of the present invention is to provide an economical stencil printing machine which eliminates waste of ink consumption.

[0005]

According to the present invention, in order to solve the above-mentioned problems, a plate cylinder partially formed by an ink-permeable peripheral wall and having a stencil master wound around the outer periphery thereof, An ink supply means provided inside the plate cylinder, and arranged near the outer periphery of the peripheral wall portion of the plate cylinder and inside the rotation system of the plate cylinder,
A stencil feeding / discharging unit rotatable relative to the peripheral wall of the plate cylinder, the stencil feeding / discharging unit comprising at least a master supply unit for winding and accommodating a stencil master in a roll shape; And a platen roller for plate making, and a perforating means for thermally perforating the stencil master outside the rotation system of the plate cylinder has a platen roller relative to the platen roller. Movably disposed, and further upstream of the stencil master in the stencil master moving direction.
Side of the stencil master so that it contacts the cylinder side of the stencil master.
Removes and collects ink from the used master
In addition, there is provided a stencil printing machine in which an ink removing means for returning the ink to the plate cylinder is provided.

[0006]

When making the stencil master 21, the stencil feeding / discharging unit 20 is stopped at a fixed position (upper position), the thermal head unit 31 is moved to the position 31 ', and the thermal head unit 31 is pressed against the platen roller 23 via the stencil master 21. . When the plate discharging take-up unit 24 rotates in the direction A in the figure, the peripheral wall 8 of the plate cylinder 1 also rotates in the direction B in the figure, and the stencil master 21 adhered to the peripheral wall 8 is peeled off as a used master. Then, the ink removal device 50 removes the ink adhering to the used master while removing the ink from the plate discharge take-up unit 2.
It is wound into 2. At this time, a new stencil master 21 that has not been perforated is sequentially supplied from the master supply unit 22 and the peripheral wall 8 rotates, and when the peripheral wall 8 rotates to a predetermined position, an image signal is supplied to the thermal head unit 31. The new stencil master 21 is attached to the peripheral wall portion 8 of the stencil cylinder 1 while being pierced. When the plate cylinder 1 reaches a predetermined position, the signal supply to the thermal head unit 31 stops, and the thermal head unit 31 moves to the original position. Next, when the peripheral wall portion 8 of the plate cylinder 1 reaches a predetermined position, the peripheral wall portion 8 and the plate discharging take-up portion 22 stop driving, and the plate making ends.
Subsequently, the plate supply / discharge unit 20 rotates together with the plate cylinder 1,
The printing paper can be printed by rotary printing.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing a main part of a stencil printing machine according to one embodiment of the present invention, and FIG. 2 is a transverse sectional view of the same. As shown in the figure, the plate cylinder 1 has a hollow cylindrical shape, and side plates 2 and 3 are formed at both ends. One side plate 2 is supported by a fixed shaft 4 penetrating the plate cylinder 1 via a clutch 5 and a drive shaft 6 from a motor (not shown), and the other side plate 3
Has a structure supported by the shaft 4 via a clutch 7. Therefore, by releasing the clutches 5 and 7, the side plates 2 and 3 and the peripheral wall 8 of the plate cylinder 1 can be individually rotated. Further, a portion corresponding to the printing surface of the peripheral wall 8 of the plate cylinder 1 is formed by an ink-permeable peripheral wall 9. Further, an ink supply unit 10 fixed to the shaft 4 is provided in a hollow portion of the plate cylinder 1. The ink supply unit 10 includes an ink distributor 11 and an ink roller unit 12.

The side plates 2 and 3 support a plate supply / discharge unit 20 and an ink removing device 50, which are arranged so as to be close to the outer periphery of the peripheral wall portion 8 of the plate cylinder 1 and inside the rotation system of the plate cylinder 1. Have been. The stencil supply / discharge unit 20 is a stencil master 2
1 is provided with a master supply unit 22 for winding and housing the plate 1, a platen roller 23, and a plate discharge winding unit 24 for winding and storing a used master, and these are installed in parallel with the plate cylinder 1. The platen roller 23 and the plate discharging take-up unit 24 are driven to rotate by a motor 25 via a pulley 26. A drive signal to the motor 25 is supplied by connecting a signal line 28 to a connector 27 provided on the side plate 2. Signal line 2 to connector 27
Connection and disconnection of 8 can be performed by well-known mechanical or electrical means. This connector 27 can also serve as a fixing means for the side plate 2.

Thermal head unit 3 as a perforating means
Reference numeral 1 denotes a position that does not hinder rotation of the plate cylinder 1 and is attached to a position that can face the platen roller 23.
The thermal head unit 31 is moved by a mechanism (not shown) such as a cam, a solenoid, a crank, etc., into a position where the rotation of the plate cylinder 1 is not hindered (retracted position) and the platen roller 23.
The plate can be moved between a position (advance position) and a platen roller 23 via the stencil master 21 only during stencil making.

As a means for detecting the end position of the stencil master 21 in an arbitrary plate making operation, an end mark detecting device (not shown) using known optical means is installed at a position where the rotation of the plate cylinder 1 is not hindered. It is possible to move according to.

The ink removing device 50 will now be described in detail. In this embodiment, the ink removing device 50 has a rectangular cross section.
Is in the vicinity of the center of the section and the rotation axis 51 (parallel to the rotation axis of the plate cylinder)
By rotating in the direction C in the figure, the stencil master is attached so as to come into contact with the side of the stencil master that comes into contact with the plate cylinder and, if necessary, with the peripheral wall of the plate cylinder. Here, the material of the ink removing device 50 is metal, plastic,
Rubber or the like can be used alone or in combination. Further, the cross-sectional shape of the ink removing device 50 is not limited to a rectangle, but may be any shape such as a circle or a star. The ink removing device 50 may be movable in the direction C in FIG. 3 so that the ink removing device 50 can be separated from and brought into contact with the plate discharging take-up portion as shown in FIG. As described above, the roller 52 for scraping the ink on the stencil master by rotation and the doctor 53 for collecting the ink on the roller may be combined. Further, the ink removing device 50 is brought into contact with only the opening of the peripheral wall of the plate cylinder by an appropriate moving mechanism, and is separated at the unopened portion, so that the ink removed by the ink removing device 50 is removed from the peripheral wall of the plate cylinder. It may return to the ink supply unit 10 through the opening.

Next, the operation of the embodiment having the above configuration will be described. At the time of plate making, the plate supply / discharge unit 20 stops at a fixed position, which is the uppermost position shown in FIG. 1, and the signal line 28 is connected to the connector 27 by mechanical or electrical means (not shown). Thereby, the motor 25 and the clutches 5, 7
Is connected, the platen roller 23 and the plate discharge take-up unit 24 are driven, and the clutches 5 and 7 are disconnected. At this time, at the same time, the thermal head unit 31 moves from the retreat position shown by the solid line in FIG. 1 to the forward position shown by the broken line, and is pressed against the platen roller 23 via the stencil master 21.

Next, when the plate discharging take-up unit 24 rotates in the direction of arrow A in FIG. 1, the peripheral wall 8 of the plate cylinder 1 simultaneously rotates in the direction B, and the used master stuck on the peripheral wall 8 is removed. The plate removal winding unit 24 is peeled off while removing the ink adhering to the used master by the ink removing device 50.
It is wound up. Ink that has been removed by the ink removing unit 50 is recovered as described above, it is reused by returning the plate cylinder peripheral wall. The unprinted stencil master 21 is supplied from the master supply unit 22 simultaneously with the winding of the used master. When the peripheral wall portion 8 of the plate cylinder 1 rotates to a predetermined position, an image is displayed on the thermal head 31. When a signal is supplied, perforation of the stencil master 21 starts, and after the stencil master 21 is perforated, the stencil master 21 is attached to the peripheral wall portion 8 of the plate cylinder 1. When the required amount of plate making is performed, the thermal head 3
1 is stopped, and the thermal head 31 is turned off as shown in FIG.
At the retreat position indicated by the solid line. Further, the perforated stencil master 21 is sent to a predetermined position, after which the operation of the stencil supply / discharge unit 20 is stopped, and the stencil making is completed.

When the stencil making is completed, the signal line 28 is disconnected from the connector 27, and stencil printing can be performed by the stencil cylinder 1 on which a new stencil master 21 is adhered. As the stencil printing method, a known method can be used.

In the apparatus of the present invention, a recently proposed stencil master (stick prevention layer, antistatic layer, back coat layer) consisting essentially of a thermoplastic resin film having a thickness of 0.5 to 10 μm is provided. Can be used. In the apparatus of the present invention, by providing a supply portion of a roll-shaped master substantially made of a thermoplastic resin film and a plate discharge take-up portion for winding up the used master on the outer peripheral portion of the outer wall of the plate cylinder, Even a stencil master made of a weak and substantially thermoplastic resin film can perform plate feeding, plate making, plate making, and plate discharging without troubles such as wrinkles and jams. Further, by using an extremely thin stencil master substantially made of a thermoplastic resin film, the stencil master roll diameter can be reduced.

[0017]

According to the stencil making and printing apparatus of the present invention, the following remarkable effects can be obtained because of the above configuration. (1) There is no fear that the ink protrudes from the side of the plate discharge take-up roll and stains the surroundings. (2) The diameter of the plate discharge take-up roll is reduced, and the plate supply / discharge unit can be reduced in size. (3) Remove and collect ink adhering to the master
By returning to the plate cylinder, ink can be saved.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a main part of a stencil printing machine according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the device of FIG.

FIG. 3 shows a stencil printing machine according to another embodiment of the present invention.
FIG.

FIG. 4 is a view similar to FIG. 1 of a stencil printing machine according to yet another embodiment of the present invention.

FIG. 5 is a side sectional view showing a main part of a conventional stencil printing machine in which a plate supply / discharge unit is integrated with a plate cylinder.

[Explanation of symbols]

 Reference Signs List 1 plate cylinder 2, 3 side plate 4 shaft 5, 7 clutch 6 drive shaft 8 peripheral wall 9 ink permeable peripheral wall 20 plate supply / discharge unit 21 stencil master 22 master supply unit 23 platen roller 24 plate discharge winding unit 31 thermal head 50 ink removal apparatus

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-73987 (JP, A) JP-A-3-239581 (JP, A) Fully open 1986-206446 (JP, U) Really open 1987 178164 (JP, U) Japanese Utility Model Showa 60-170339 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41L 13/04 B41L 13/14

Claims (1)

(57) [Claims] Claims: 1. A part is formed of an ink-permeable peripheral wall,
A plate cylinder around which a stencil master is wound; an ink supply means provided inside the plate cylinder; and an ink supply means disposed near the outer periphery of the peripheral wall of the plate cylinder and inside the rotation system of the plate cylinder. A plate supply / discharge unit capable of rotating relative to the peripheral wall of the plate cylinder, wherein the plate supply / discharge unit includes at least a master supply unit for winding and accommodating a stencil master in a roll shape; A stencil take-up section for taking up and storing the master, and a platen roller for plate making, wherein a piercing means for thermally piercing the stencil master outside the rotation system of the plate cylinder has a relative position with respect to the platen roller. Movably arranged on the upstream side of the stencil master in the stencil master moving direction.
The stencil master is provided in contact with the surface of the stencil master
Removes and collects ink from the used master
A stencil printing machine, characterized in that an ink removing means for returning the ink to the plate cylinder is provided .