JP3273625B2 - 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.

[0002]

2. Description of the Related Art The general outline of a conventional stencil printing press of this type is similar to that of a stencil printing press to which the present invention shown in FIG. 1 is applied, and will be described with reference to FIG. The stencil printing machine includes an original reading means 1 for reading an original image, a stencil making means 2 for perforating a rolled stencil 4, a cutter 7 for cutting a stencil made, and a plate cylinder 3 on which the stencil made. A press roller 8 for pressing the printing paper 5 against the outer peripheral surface of the plate cylinder 3; and a press roller operating means 9 for moving between an operation position for pressing the press roller 8 against the plate cylinder 3 and an inoperative position separated from the press roller 8. And an ink supply means 10 arranged inside the plate cylinder 3 to supply ink to the inner surface of the plate cylinder 3. Reference numerals 11, 12, and 13 denote a document feed roller, a contact sensor, and a document tray of the document reading means 1, reference numeral 14 denotes a clamper provided on the outer periphery of the plate cylinder 3, reference numerals 15 and 16 denote platen rollers of the plate making means 2, respectively. Change the thermal head to 17, 18, 19,
Reference numerals 20 and 22 denote registration rollers, paper feed rollers, separation members, call rollers and paper feed tables of the paper feed means 21, respectively.
Denotes an ink pipe, an ink roller, and a doctor roller of the ink supply means 10, 26 denotes a plate discharge roller, 27 denotes a sheet peeling claw, 28 denotes a sheet discharge conveyance belt, 29 denotes a sheet discharge tray, and 30 denotes a plate discharge tray.

In the above-described apparatus, based on the image information obtained by the original reading means 1, the perforating means 4 perforates the base paper 4 to make a plate, and then the perforated stencil sheet is cut by a cutter 7; It is mounted on the plate cylinder 3 and printing is performed by pressing the paper 5 with the press roller 8 on this, and the length of the stencil sheet to be cut at that time depends on the size of the original and the paper 5 to be used. Regardless of the length. By the way, when printing a small number of copies with such a printing machine, the ratio of the cost of the base paper to the total cost is large. Therefore, it is desirable that the base paper has a length close to the document length with as little waste as possible. . However, since the conventional printing press is as described above, for example, even when printing on a postcard or paper of the same size, a base paper having the same size as when printing on paper of a larger size is used. Since the base paper must be used, the base paper is wasted, and after printing, the base paper on which a large amount of ink has adhered is discarded, resulting in waste of ink, especially when printing small copies. However, there is a problem that the amount of ink discarded is larger than the amount of ink supplied to the printer.

[0004]

Therefore, in order to solve such a problem, there has been proposed one disclosed in Japanese Patent Application Laid-Open No. 64-18683. This stencil printing machine is capable of changing the cutting length of the base paper in accordance with the size of the printing drum. Drums must be prepared, which not only increases the cost, but also requires changing the printing drum each time the size of the paper changes, which is troublesome and reduces work efficiency. Since ink is supplied to the entire surface regardless of the size and position of the image, the ink other than the image is applied to unnecessary places, and the waste of ink is performed in the same manner as described above. There's a problem.

Accordingly, an object of the present invention is to solve the above-mentioned problems of the conventional stencil printing machine, to eliminate the need to switch the plate cylinder even when the size of the paper changes, to improve the working efficiency, and to improve the image quality. Since the base paper is cut to the length corresponding to the size and the position, the base paper is not wasted, and the paper is pressed only at the portion corresponding to the size and the position of the image, and the ink is applied only to the portion. Since the ink oozes out, there is no waste of ink, so that the printing cost can be reduced. Further, the press roller is not stained, and the portion corresponding to the size and position of the image. Since the ink is supplied only to the holes, the ink other than the image is supplied to unnecessary places, and there is no waste of ink. It is to provide a printing press.

[0006]

According to the present invention, in order to achieve the above object, the invention according to claim 1 comprises a document reading means for reading a document image and a plate making means for punching a roll-shaped base paper. A cutter for cutting a pre-made stencil, a plate cylinder on which the pre-made stencil is mounted, a press roller for pressing the printing paper against the outer peripheral surface of the plate cylinder, and an operating position for pressing the press roller against the plate cylinder. A stencil printing machine, comprising: a press roller actuating means moving between a separated inoperative position; and an ink supply means arranged inside the plate cylinder to supply ink to the inner surface of the plate cylinder. And control means for controlling the operation of the ink supply means so as to automatically change the ink supply area on the inner surface of the plate cylinder in accordance with the image position information in the above. A doctor roller driving member for controlling the rotation of the doctor roller, and a convex portion on the outer periphery of the doctor roller for interrupting the ink supply so that the ink supply area can be changed according to the size and position of the image, and the supply of the ink. And a concave portion in which the process is performed is provided.

[0007]

According to the first aspect of the present invention, when an original is read by the original reading means, image position information relating to the size and position of the image becomes a signal, and ink is supplied to the ink supply means in accordance with the image position information. Issue a command,
A supply ink area corresponding to the size and position of an image is formed by a convex portion provided on the outer periphery of the doctor roller and a concave portion where the supply of ink is performed, and
In this way, the supply ink area can be automatically changed according to the image position information.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention shown in the drawings, the press roller 8 is moved by a press roller operating means 9 shown in FIG. 2 between an operating position shown by a solid line and an inoperative position shown by a dotted line. The press roller operating means 9 has an inverted T-shaped lever 32 and a cam means 38 whose base is pivotally supported by a pivot 31 provided on a machine frame (not shown). And a spring 35 is stretched between the end of the second lever 34 and the machine frame to constantly urge the press roller 8 toward the plate cylinder 3. A cam roller 37 is pivotally supported at the tip of the third lever 36. The cam means 38 is provided at a position facing the cam roller 37.The cam means 38 has an outer cam 40 fixed to a pivot 39 pivotally supported by the machine frame, and an inner cam 41 mounted so as to be position-adjustable. ing. As shown in FIG. 3, the doctor roller 25 is provided on its outer periphery with a convex portion 43 for interrupting the supply of ink and a concave portion 44 for supplying the ink. In order to change the ink supply area 46, the doctor rollers 25 are provided at different positions so as to form patterns a, b, c, d, e, and f shown in FIGS.
By controlling a doctor roller driving member 49 composed of a stepping motor on the basis of image information, is rotated to a position where a desired ink supply area 46 is formed.

In the above-described apparatus, original reading and plate making are performed in the same manner as in the prior art. However, when an original is read by the original reading means 1, image position information relating to the size and position of an image becomes a signal. 6 is input to the control means 6 shown in FIG.
A command is issued to the cutter 7 to cut the base paper into a length corresponding to the image position information to complete plate making, and a command is issued to the driving member 47 of the inner cam 41 of the cam means 38 of the press roller operating means 9 to issue an instruction to the inner cam 41. Is rotated to form a cam recess having a length corresponding to the image position information with the outer cam 40.
When a paper passing command is issued, the paper supply means 21 is operated, and the paper 5 is synchronized with the base paper 4 mounted on the plate cylinder 3, and
And the press roller 8, the driving means 48 of the cam means 38 is operated to rotate the cam means 38. When the cam roller 37 faces the cam recess, the inverted T-shaped lever 32 is moved by the spring 35. In FIG. 2, the press roller 8 rotates clockwise about the pivot 31, and the press roller 8 moves from the non-operation position indicated by the dotted line to the operation position indicated by the solid line to press the sheet 5 against the base paper 4, and the inside of the plate cylinder 3 The printing is performed by causing the ink to bleed from the printing paper. At this time, the press roller 8 rotates around the plate cylinder 3, and the printed paper 5 is peeled by the peeling claw 27 and discharged to the paper discharge tray 29. The cam roller 37 is engaged with the cam projection, and the press roller 8 returns to the inoperative position.

On the other hand, at the same time that the control means 6 issues a command to the inner cam driving member 47 of the press roller operating means 9 as described above, it also issues a similar command to the doctor roller driving member 49, whereby the doctor roller driving member 49 operates. Then, the doctor roller 25 is caused to face the ink roller 24 with a pattern selected from the above-mentioned patterns a to f, for example, so as to form the supply ink area 46 corresponding to the image position information on the size and position of the image. The desired supply ink area 46 is formed on the surface of the plate cylinder 3 by the concave portion 44.

[0011]

The present invention is as described above. According to the first aspect of the present invention, there is provided an original reading means for reading an original image, a stencil making means for punching a roll-shaped stencil, and cutting the stencil having been made. A cutter, a plate cylinder on which a prepressed stencil sheet is mounted,
A press roller that presses the printing paper against the outer peripheral surface of the plate cylinder, press roller operating means that moves between an operating position that presses the press roller against the plate cylinder and an inoperative position that is separated from the press roller, and disposed inside the plate cylinder. In a stencil printing machine provided with ink supply means for supplying ink to the inner surface of the plate cylinder, the ink supply area on the inner surface of the plate cylinder is automatically changed according to image position information in the document reading means. Control means for controlling the operation of the ink supply means, the ink supply means comprises a doctor roller, and a doctor roller drive member for controlling the rotation drive of this doctor roller,
The outer periphery of the doctor roller is provided with a convex portion for interrupting the ink supply and a concave portion for supplying the ink so that the ink supply area can be changed and controlled in accordance with the size and position of the image. It is not necessary to switch the plate cylinder even if the dimensions change, and the working efficiency can be improved. In addition, the ink is supplied only to the portion corresponding to the image position information relating to the size and position of the image by the convex portion that interrupts the supply of ink and the concave portion where the ink is supplied, so that ink other than the image is unnecessary There is an effect that the printing cost can be reduced without supplying the ink until the ink is used up and wasting the ink.

[Brief description of the drawings]

FIG. 1 is a schematic front view of an embodiment of the present invention.

FIG. 2 is a partially cutaway enlarged front view of the plate cylinder and press roller of the above.

FIG. 3 is a partially cutaway bevel view of the doctor roller according to the first embodiment;

FIG. 4 is a view showing various patterns for different supply ink areas of the doctor roller of the above.

FIG. 5 is an explanatory diagram showing a relationship between an ink roller and a doctor roller according to the first embodiment.

FIG. 6 is a schematic diagram of a control circuit of the above.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 original reading section 2 plate making section 3 plate cylinder 4 base paper 5 paper 7 cutter 8 press roller 9 press roller operating means 10 ink supply means 24 ink roller 25 doctor roller 32 inverted T-shaped lever 37 cam roller 38 cam means 41 inner cam 46 supply ink area 47 Inner cam drive member 48 Cam means drive member 49 Doctor roller drive member

Claims (1)

(57) [Claims] 1. A document reading means for reading a document image, a plate making means for punching a roll-shaped stencil, a cutter for cutting a stencil made stencil, a plate cylinder on which the stencil made stencil is mounted,
A press roller that presses the printing paper against the outer peripheral surface of the plate cylinder, press roller operating means that moves between an operating position that presses the press roller against the plate cylinder and an inoperative position that is separated from the press roller, and disposed inside the plate cylinder. In a stencil printing machine provided with ink supply means for supplying ink to the inner surface of the plate cylinder, the ink supply area on the inner surface of the plate cylinder is automatically changed according to image position information in the document reading means. Control means for controlling the operation of the ink supply means, the ink supply means comprises a doctor roller, and a doctor roller drive member for controlling the rotation drive of this doctor roller,
The outer periphery of the doctor roller is provided with a convex portion for interrupting ink supply and a concave portion for supplying ink so that the ink supply area can be changed and controlled in accordance with the size and position of an image. Features a stencil printing machine.