JPS5869086A - Inking apparatus for single cylinder type rotary mimeographic machine - Google Patents

Abstract

PURPOSE:To eliminate an overthick printing while removing the generation of noise with a gentle infiltration of ink onto a screen by delivering air in stead of an inking roller provided in a plate cylinder. CONSTITUTION:An air delivery pump 2 is so arranged outside a plate cylinder 1 that a discharge path 3 of the pump 2 communicates with a shaft 4 to deliver air into the cylinder 1 via a conducting path 5. The plate cylinder 1 into which ink is fed from an ink inlet 17 turns while a paper is fed. Ink is allowed to infiltrate through a net-like rotor 12 and a screen 18 and printed on the paper through plate holes of a stencil paper 6 applied on the outer surface thereof. When ink becomes blurred, a pump motor 23 and a pump 2 are operated to deliver air into the plate cylinder 1 so that internal pressure will be raised gently to increase the printing concentration. Properly stopping the air delivery at this stage permits the continuation of the printing at an optimum concentration. EFFECT:This eliminates offset due to excessive ink.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves attaching a plate-made base paper to a plate cylinder, supplying ink from the inside of the plate cylinder, and ejecting the ink through a plate S of the base paper. This invention relates to an ink dispenser in a so-called single-cylinder rotary copying machine, in which a sheet of paper to be printed is passed between the printing plate cylinder and the plate cylinder rotated for printing.

As shown in FIG. 6, an ink fountain roller 8 is installed inside the plate cylinder 1 parallel to the axis of the plate cylinder 1, and this is connected to the operating shaft 10. ni W
#, 114% 1 L1 operating shaft 10 connected via b
is passed through the inner ink sYt of the drive shaft 9 to the outside of the plate cylinder, and this operating shaft 10 is appropriately rotated from the outside to move the internal ink dispenser roller 8 onto the inner wall of the plate cylinder 1.

It is designed so that it can be held floating on the inner wall.

In the conventional method, when the ink bleed roller 8 is brought into contact with the ink bleed roller 8 and put into operation, pressure is increased hydrodynamically between the inner wall of the plate cylinder 1 and the ink bleed roller 8, and ink oozes out of the plate cylinder. , the pressure increase tends to be more than necessary, and there is a disadvantage that there is a tendency for too much ink to come out.

In addition, at this stage, the amount of ink transferred to the paper is naturally too large, and the paper that is ejected in duplicate causes a so-called set-off phenomenon in which the ink printed on the lower paper is transferred to the back side of the upper paper. It tends to reduce print quality. In addition, since the ink fountain roller 8 rolls on the inner wall of the plate cylinder 1, if it rides on parts of the inner wall such as the ink injection section, it generates noise and also damages the ink fountain roller 8.

SUMMARY OF THE INVENTION An object of the present invention is to provide a novel ink fountain device for a single-barrel rotary copying machine that overcomes the above-mentioned drawbacks.

The configuration of the present invention will be described with reference to an embodiment shown in FIGS. 1 and 2.

Reference numeral 1 denotes a plate cylinder, which is formed by closely fitting a net-like cylindrical body 12 in which a large number of small holes are formed in a metal net, a metal plate, or a synthetic resin film to seven flange 13aN13b. Plate cylinder 1
The bearings 15a are attached to the frames 14m and 14b.
It is fixed to a shaft 4 supported by x15b, and is rotationally driven by a sprocket 16 fixed at one end of the shaft 4.

The sprocket 16 is connected to and driven by a chain on a motor side sprocket' (not shown). 1711 ink injection port, which is used to inject an appropriate amount of ink in advance. Alternatively, the ink inlet 17 may be omitted and ink may be injected from the outside through one end of the shaft 4. The outer periphery of the mesh cylinder 12 is covered with a cloth or metal screen 18, and both ends of the screen 18 are fixed to the outer periphery by suitable means. Moreover, m1lsK
A restraining plate 20 provided with a base paper retaining protrusion 19 is fixed.

At one end 4a of the shaft 4, air is discharged from the pump 2 and opens into the inside of the plate cylinder. A cover 22 prevents ink from adhering to the opening of the conduction path 5.

The pump 2 is driven from a pump motor 23 via a connecting link 24 at appropriate times, and every time it is driven, air is sucked in through the suction hole 25 of the pump and pumped into the discharge pipe 3.

An impression cylinder 7, which is rotatable and follows the plate cylinder 1 in contact with it, is attached to the outer periphery of &ll1J1 so as to be pressed by a spring 36. In the paper loading table 26#i in FIG. 2, a paper feeding rubber roll 27 is provided at the front end of the upper part, and a paper sliding plate 28 and a set sliding upper board 29 are provided on the left side of the paper feeding rubber roll 27.
The printing paper 32 is placed on the paper tray 26, which is provided with a synchronized roll 60 below the paper sliding plate 28 and a synchronized upper roll 61 above the paper sliding upper plate 29. The sheets are fed one by one by the rubber roll 27, the sheets are fed by the synchronous roll 30 and the synchronous upper roll 61 so that the printing is maintained at a fixed position, and the sheets are printed and discharged by pressure bonding between the plate cylinder 1 and the impression cylinder 7.

Since this invention is constructed as described above, when using this invention, firstly, a predetermined amount of ink is put into the plate cylinder 1 from the ink injection port 17, and when the paper is rotated and fed, the ink inside is transferred to the reticulated cylindrical body 12 and the screen. 18 and is further printed on the paper through the 11I plate perforations of the base paper 6 attached to the outer periphery. In this case, if the amount of ink transferred to the paper is greater than the amount of ink that leaches out, the print will gradually fade. At this time, when the pump motor 23 is energized, the d1 air supply pump 2 is activated.
Air is introduced into the plate cylinder 1. During printing, the reticulated cylindrical body 12
The inner wall of the plate cylinder 1 is completely covered with viscous ink due to rotation and is in a glazed sealing state, so when air is introduced, the internal pressure of the plate cylinder 1 increases.

However, compared to the internal volume of the plate cylinder 1, which is mostly occupied by air, the air supply for one stroke of the air supply pump 2 is considerably smaller than your company (in the example shown, it is about one hundredth). , this increase in internal pressure occurs extremely slowly. Also, as it is obvious that the discharge hole of the air supply pump 2 is provided with pulp, during the suction stroke, the air supplied into the plate cylinder 1 may flow backwards or the plate cylinder 1 may be temporarily blocked. Since there is no communication tUt between the inside and outside, the increased internal pressure does not drop. This internal pressure is evenly applied to the ink layer attached to the inner wall of the 12 mesh cylinders, so the ink leaches out evenly and slowly to the mesh cylinder 12 and the screen 18, and a small amount of ink leaks out from the perforations of the base paper 6 where the plate is made. The print density gradually reaches the optimum print density.

If the operation of the air supply pump 2 is stopped at this stage, the air supply will stop and the internal pressure of the plate cylinder 1 will gradually become equal to the external pressure. (Actually, about 500 pages of fine-text originals) can be printed continuously at an appropriate density.

Moreover, the air supply pump 2 does not depend on the pump motor 26,
It goes without saying that the same effect can be obtained even if the actuation is performed manually.

Although an example is shown in which an independent pump is used as the air pump, it is obvious that it can also be used as an ink pressure pump by providing a cut-off valve.

As described above, according to the present invention, the air is supplied by the air supply pump 2 very slowly, and the ink is
In addition, it can evenly leak into the reticulated cylinder 12 and the screen 18 and pass through the base paper 6 to gradually reach the optimum printing density, so there is no need to worry about sudden excessively dark printing or set-off. If air supply is stopped at this stage, printing can be continued at the optimum density for a considerable number of sheets thereafter. Furthermore, since no ink fountain roller is required inside the plate cylinder 1, no noise is generated, and there is no need to troubleshoot repairs due to damage to the roller. In addition, ink can be dispensed efficiently by simple operation of a push button switch or manual lever at appropriate times during operation, and printing density can be easily controlled by changing the number of operations of the air supply pump 2. At the same time, it is also possible to detect the pressure inside the plate cylinder by a detection means and operate the air supply pump.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing an embodiment of the present invention, and Fig. 2 is a longitudinal sectional view showing an embodiment of the present invention.
FIG. 6 is a central sectional view showing an assembled state of a conventional ink fountain device and a plate cylinder. 1: Plate cylinder 2: Air supply pump 3 Valley 6: Discharge sight 4: Shaft 5: Conduction path 6: Base paper 7: Impression cylinder 12; Reticulated cylindrical body 13&, 13b: 7 Lange 14 a s 14 b ” frame 18 Niclean 21: Air feed joint 26: Pump motor 25: @Inlet patent applicant Seiki Kogyo Co., Ltd.

Claims (1)

[Claims] An ink dispenser for a single-barrel rotary copying machine, characterized in that air is introduced into the plate cylinder (1) through a passage (5).