JPH08142474A - Plate cylinder of stencil printing machine - Google Patents

Abstract

PURPOSE: To prevent the occurrence of leakage of ink due to its excessive sticking of ink onto the inner peripheral surface of the plate cylinder of a stencil printing machine. CONSTITUTION: Ink supply means for supplying Ink is provided on the inner peripheral surface of a stencil printing machine, and at the same time, there is provided recovery means for recovering excessive ink on the inner peripheral surface of the same. Specifically, in the structure where the plate cylinder main body 4 is supported by a hollow shaft 3, ink reservoir means is provided within the hollow shaft 3 in order to supply ink onto the inner peripheral surface of the plate cylinder main body 4, simultaneously, ink recovered from the inner peripheral surface of the same is returned to the reservoir means.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A stencil printing machine generally has a plate cylinder body including a peripheral wall of an ink passage structure, and a clamp for locking a starting end of a stencil sheet on a part of an outer peripheral surface of the plate cylinder body. The stencil sheet having the image perforated in the plate making section is wound around the peripheral wall of the plate cylinder main body in a state where the starting end of the stencil is locked by the clamp, and the pressing member comes into contact with the plate cylinder main body and its outer peripheral surface. In order to send the printing paper between the, and the ink pushed out through the ink passage portion from the inner side of the peripheral wall of the plate cylinder body along with the rotation of the plate cylinder body is transferred onto the printing paper through the perforation part of the stencil sheet, It is designed to print.

[0003]

When printing with such a conventional stencil printing machine, when the area ratio of the printed image portion is low, or when a large amount of printing is carried out with one stencil sheet, printing is performed. Excess ink that is not consumed increases and ink leaks from around the stencil sheet.

An object of the present invention is to provide a plate cylinder device for a stencil printing machine which solves the above-mentioned problems in the conventional stencil printing machine and does not generate excess ink.

[0005]

In order to achieve the above object, the present invention relates to a cylindrical plate cylinder main body which is rotatably supported around a central axis and includes an ink passage structure at a peripheral edge thereof, and the plate cylinder. A plate cylinder device for a stencil printing machine, comprising: an ink supply unit that supplies ink onto the inner peripheral surface of the main body; and an ink recovery unit that recovers excess ink on the inner peripheral surface of the plate cylinder main body. It is provided.

The plate cylinder body is supported by a hollow shaft so as to be rotatable about a central axis, and an ink storage means is provided in the hollow shaft. The ink collected by the ink collecting means is stored in the hollow shaft. The ink may be returned to the ink storage means provided in the.

[0007]

According to the above-mentioned structure, the excess ink adhering to the inner peripheral surface of the plate cylinder main body can be removed from the inner peripheral surface of the plate cylinder main body by the ink collecting means, and the ink leakage due to the excess ink can occur. Can be prevented. Further, in this case, if the plate cylinder main body is rotatably supported by the hollow shaft about the central axis, the hollow shaft acts as a means for supporting the plate cylinder main body through and supporting the plate cylinder main body stably. Thus, a plate cylinder device can be provided which can be provided with an ink storage means therein and which is convenient for containing the ink collected from the inner peripheral surface of the plate cylinder body.

[0008]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

1 and 2 show an embodiment of a plate cylinder device of a stencil printing machine according to the present invention. The plate cylinder device 1 includes a hollow shaft 3 supported by a housing of a stencil printing machine (not shown), and a cylindrical plate cylinder rotatably supported concentrically by bearings 6 at both ends thereof. It has a body 4. The bearing 6 preferably has a structure for blocking the ink in the annular space 31 defined between the hollow shaft 3 and the plate cylinder body 4 so as not to leak to the outside.

The plate cylinder main body 4 is composed of a thin plate-shaped cylindrical body 11 and two end supporting ring bodies 5 engaged with both ends of the cylindrical body 11, and the end supporting ring bodies 5 on both sides respectively. It engages with the bearing 6 and is rotatably supported by the hollow shaft 3 in a rotatable manner.

The plate cylinder main body 4 has a clamp 11 on the outer peripheral portion, and the stencil sheet whose starting end is held by the clamp 11 is wound around and mounted on the outer peripheral surface. The peripheral wall of the plate cylinder main body 4 except the arrangement portion of the clamp 11 and both side edge portions has an ink passage structure.

A gear 7 is formed on the end support ring 5, and the gear 7 has a pair of drive gears 8 mounted on a drive shaft 9 which is driven to rotate by a plate cylinder drive motor (not shown). The gears 7 are meshed with each other, whereby the pair of gears 7 are rotated in synchronization with each other.

An inner space 32 is formed in the hollow shaft 3, and an ink storage chamber D is formed in the inner space 32 for containing ink. Further, an ink outlet port A and an ink reservoir connecting port 25 connected to the ink outlet port A are provided.

In the axial space 32, the ink feed pump 2 is further provided.
3 is provided. The suction port of the ink supply pump 23 is connected to the ink reservoir connection port 25 by the ink conduit 22. An ink conduit 24 is connected to the discharge port of the ink supply pump 23.
Penetrates the hollow shaft 3 and extends into the annular space 31 to become the ink ejection port 21 and open in the annular space 31.

Ink is ejected from the ink ejection port 21, and a press roller 61 shown in FIG. 2 sandwiches a printing sheet (not shown) between the printing drum body 4 and the printing drum body 4 and presses it against the outer peripheral surface of the printing drum body 4. Then, the ink in the annular space 31 passes through the ink passage portion and further passes through the perforation portion of the stencil sheet to be transferred onto the printing paper to perform printing.

The amount of ink in the annular space 31 is detected by an ink amount sensor having an ink amount detecting needle (not shown), and the drive of the ink feed pump 23 is controlled according to the amount of ink detected by the ink amount sensor. . The electric circuit device such as an ink amount sensor and the ink feed pump 23 may be arranged in the shaft inner space 32 so as not to be contaminated with ink.

According to the above-mentioned structure, when the drive gear 8 is rotationally driven in the clockwise direction as viewed in FIG. 2, the plate cylinder main body 4 is supported by the hollow shaft 3 so as to rotate around its central axis. Rotate counterclockwise (arrow in the figure). At this time, when excess ink is attached to the inner peripheral surface of the plate cylinder main body 4, the ink is attached to the hollow shaft 3 so as to relatively relatively slidably contact the inner peripheral surface of the plate cylinder main body 4 at one end. Between the member 52 and the inner peripheral surface of the plate cylinder body 4, an ink pool P1 is formed by the excess ink.

When the ink pool P1 is formed, the excess ink flows down due to the inclination of the ink collecting member 52 and P
2 and the ink recovery port 5 provided in the hollow shaft 3
From 1 to the ink storage portion D of the axial space 32.

FIG. 3 shows another embodiment of the present invention. Note that, in FIG. 3, portions corresponding to those in FIG. 1 are denoted by the same reference numerals as those in FIG.

In this embodiment, the ink recovery unit 52
Are integrally formed with the hollow shaft 3. In this case also, the excess ink in the ink reservoir P1 is recovered from the ink recovery port 51 to the ink storage section D.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a plate cylinder device of a stencil printing machine according to the present invention.

2 is a cross-sectional view of the plate cylinder device shown in FIG.

FIG. 3 is a cross-sectional view similar to FIG. 2, showing another embodiment of the plate cylinder device of the stencil printing machine according to the present invention.

[Explanation of symbols]

 3 ... Hollow shaft 4 ... Plate cylinder main body 7 ... Gear 8 ... Drive gear 9 ... Drive shaft 11 ... Clamp 21 ... Ink discharge port 22 ... Ink conduit 23 ... Ink supply pump 24 ... Ink conduit 25 ... Ink reservoir connection port 31 ... annular space 32 ... axial space 51 ... ink recovery port 52 ... ink recovery member 61 ... press roller

Claims (2)

[Claims] 1. A cylindrical plate cylinder main body which is rotatably supported around a central axis and includes an ink passage structure at its peripheral edge, and ink supply means for supplying ink onto the inner peripheral surface of the plate cylinder main body. A plate cylinder apparatus for a stencil printing machine, comprising: an ink collecting unit that collects excess ink on the inner peripheral surface of the plate cylinder body. 2. The plate cylinder main body is supported by a hollow shaft so as to be rotatable about a central axis line, an ink storage means is provided in the hollow shaft, and the ink recovered by the ink recovery means is hollow. The plate cylinder device of a stencil printing machine according to claim 1, wherein the plate cylinder device is adapted to be returned to the ink storage means provided in the shaft.