JPS618376A - Form cylinder for color changeover in rotary mimeographic press - Google Patents

Abstract

PURPOSE:To control color density, by a construction wherein an air-feeding pipe is fitted into a hollow rotary shaft, a compression spring and a piston plate are fitted to a knob provided at an end of the pipe, and an air-discharging pipe communicated with the air-feeding pipe is provided. CONSTITUTION:When the knob 23 is rotated, the air-feeding pipe 22 is rotated, and a roller support plate 33 is straightened or bent to change the position of an ink-diffusing roller 32. When the outer peripheral surface of the roller 32 is strongly pressed against the inner peripheral surface of the form cylinder 1 at position A, the amount of an ink 4 exuding through minute holes 2 is increased, thereby increasing the color density in printing. When the contact of the roller 32 with the form cylinder 1 is released by bringing the roller 32 to position B, the amount of the ink is decreased, thereby decreasing the color density. A piston 25 is pushed into the knob 23 against the compression spring 24, air is fed into the pipe 22, and is discharged into the form cylinder through the air-discharging pipe 31 and a pipe 30. The ink 4 contained in the form cylinder 1 is fed out to the exterior through the holes 2 by the pressure inside the cylinder 1. Accoringly, the internal pressure is increased as the number of times of pushing is increased, whereby the amount of the ink fed out is increased, and the color density is increased. When the piston is not pushed, the color density is lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a color change plate cylinder in a rotary copying machine, and more specifically, a plurality of color change plate cylinders filled with ink jets of different colors are prepared, The color changing plate 111i1' is connected to a color changing plate cylinder in a rotary copying machine, which is sequentially attached to the rotary copying machine main body to perform multicolor printing on a single sheet of printing paper. The printing paper is passed between the plate cylinder and the press roller t(υ) each time the color change plate cylinder is replaced.

``Prior Art'' Conventional color change plate cylinders in this type of rotary copying machine cannot adjust the TV of the ink oozing from the plate cylinder, so it has not been possible to adjust the color shading as appropriate.

``The problem that the invention is trying to solve'' The present invention was made in view of the above points, and it is possible to adjust the ink oozing from the plate cylinder on the surface of the printing plate. There is no way to make adjustments that will make the printing process last longer.

"Means for Solving the Problems" The present invention will be described in more detail below with reference to illustrated embodiments.

FIG. 1 is a central longitudinal sectional front view of a plate cylinder according to the present invention, and FIG. 2 is a side view of a π-shaped stack attached to the main body of a rotary copying machine.

In the figure, reference numeral 1 denotes a cylindrical color change plate cylinder having a predetermined width, and a number of small holes 2 for ink passage are provided on the circumferential surface of the cylinder. Further, the plate cylinder 1 is configured to be filled with ink 4 from an ink supply port 3. Reference numeral 5 designates a seal plug that covers the ink supply port 3. Reference numeral 6 denotes a rotating shaft of the plate cylinder 1, which is V% hollow and a return air/4 ide is rotatably fitted into the hollow portion. Numeral 7 is a trap gear fixed to one end of the rotary shaft 6, which meshes with a gear connected to a not-shown electric motor of the rotary copying machine body when mounted on the one-wheel copying machine body. 8, 9, 10, 11, and 12 are cams fixed to the rotating shaft 6. 13 is a trap round handle fixed to the other end of the rotating shaft 6. Reference numeral 14 is a handle to be held when attaching and detaching the plate cylinder 1, and is fixed to the tip of a lever described later. 15. Reference numeral 15 denotes plate release signs attached to both sides of the plate cylinder 1 of the rotating shaft 6, and a bearing 1
6.Since it is attached through 16 connections, the rotation Ii
! Even if 6 rotates, they do not rotate at the same time. 1
7.17 is the bottle 1 at the tip of the plate cylinder removal signboard 15.15.
The lever is pivoted at an angle of 8°187, and the handle 14 is fixed to its tip. Bottle 1
The base of 8.18 is fixed to the lever 17.17, and the lever 1 is attached to the protruding end of the plate cylinder detachment plate 15, 15↓.
Along the axis of 7.17 the spring catch is penetrated by a rod 19.19. 20.20 is the plate cylinder removed signboard 15.15b
! The spring catch you saw is a rod. 21.21 The spring hook is a tension spring installed between the rods 19° and 20°. Reference numeral 22 denotes an air supply/4' eve, which is rotatably fitted into the center of the rotating shaft 6. Further, a knob 23 having a U-shaped cross section is fixed to the end of the air supply base 22 on the round handle 13 side, and 24 compression springs are installed inside the knob 23. The piston plate 25 has a ventilation hole 26 in the part.
Reference numeral 27, which is slidably fitted and is formed without a bond, is a reverse valve provided at the end of the air supply pipe 22 on the side thereof. 28t'lt This is a pipe fitted externally to the air supply pipe 22 at one circle of the plate cylinder. 29.29 is the pipe 2
8 to the air supply nozzle 22. 30 is fixed to the pipe 28 along the pipe 28 and has a length of 9.

Reference numeral 31 denotes an air discharge nozzle provided inside the pipe 30, and one end thereof communicates with the air supply nozzle 22. Although not shown, the air discharge nozzle 31 is provided with a check valve. Reference numeral 32 denotes an ink diffusion roller made of felt, which is rotatably supported at the tip of a roller support plate 33.

Matc ink diffusion roller 32 fSi version l1VJ1
When the roller support plate 33 is in a position facing the press roller described later with a distance of k, and the roller support plate 33 is in the straight position, that is, in the position of the master in Figure 2, it is pressed against the circumferential surface of the plate control, and the roller support plate 3 is in pressure contact with the circumferential surface of the plate control.
When the plate 3 is bent, that is, at position B in FIG. 2, the plate 1 is separated from the circumferential surface of the plate 1. The roller support plates 33, 33 each consist of two plates, which are pivotally connected at overlapping end pins 34 and 34, and are fixed to the base pipe 28. 35 is the main body of the rotary copying machine, 36.37 is a stone bottle provided on the rotary copying machine main body 5, and the levers 17, 17 and 18 are
．． 18? I'' When tilted down as a fulcrum, the spring hook is the rod 19,
190 degrees of rotation, and the plate cylinder 1'It is securely fixed to the rotary copying machine main body 35 by the action of the compression springs 21.21. 38 is a press roller provided on the main body 35 of the copying machine 11, 39 is a trap screen carrier attached to the outer periphery of the plate cylinder 1, and 4Q is a stencil.

"action" Next, I will explain the effects of this light.

When the plate 111' is attached to the rotary copying machine body 35 and driven by an electric motor (not shown), the gear 7 rotates and the rotating shaft 6 rotates. In response to this, the plate cylinder 1 also rotates, and the filled ink 4 oozes out from the many small holes 2 for ink passage, reaching the screen carrier 39 and the color stencil 40.
It passes through the perforations of the stencil 40 and adheres to printing paper (not shown) to perform printing. In such a rotary copying machine, when the ink diffusion roller 32 is strongly pressed against the circumferential surface of the outer circumference TkJ tray cylinder 1 at the position A in FIG. 2, the ink 4 oozes out from the small holes 2. The amount of ink 4 increases and the color becomes darker during printing, and when the ink diffusion roller 32 is moved to the position B in Figure 2 to release the contact sound with the plate cylinder 1, the amount of ink 4 that oozes out decreases and the color becomes lighter. It is what it is. The position of the ink diffusion roller 32 is changed by rotating the knob 23. When the knob 23 is rotated, the air supply pipe 22 is rotated, and accordingly, the roller support plate that supports the ink diffusion roller 32 is rotated. The position of the ink diffusion roller 32 is changed by bending the trap 33 when it becomes straight. Further, the present invention provides the above-mentioned ink diffusion roller 3.
Contact pressure of plate cylinder 2 on plate cylinder 1? In addition to adjusting the color shading, another Ri method can be used. This is done by using a pump, in which the piston 25 is pushed into the knob 23 against the pressure spring 24, thereby sending air into the air supply id 22,
5. Suppression (b) This is done by making several adjustments. The air sent into the air supply pipe 22 by the compression of the piston 25 is transferred from the air discharge pipe 31 to the pipe 30.
It is then released into the plate cylinder 1. This discharged air becomes an internal pressure and sends out the filled ink 4 to the outside through the small holes 2 of the plate cylinder 1. Therefore, if the number of times the piston 25 is pressed increases, the internal pressure will increase, and the amount of ink sent out to the outside will increase, resulting in a darker color.On the other hand, if the piston 257 is not pressed at all, there will be less ink being sent out to the outside, resulting in a darker color. becomes fainter.

"Effects of the Invention" The present invention is characterized by the effect of Structure 1 as described above, and the amount of ink that oozes out from the printing cylinder. It is something that can be adjusted. Therefore, since the color shading can be adjusted as appropriate, printing can be performed with depth t.

[Brief explanation of drawings]

Fig. 1- is a central vertical sectional front view of the plate cylinder according to the present invention, and Fig. 2 is a side view of the plate cylinder installed in the main body of a rotary copying machine. 1... Plate cylinder, 2... Small hole, 4... Ink, 6...
・Rotating shaft, 7...Gear, 13...Round handle, 1
4... Handle, 15... Plate cylinder detachable plate, 16... Bearing, 17... Lever, 18... Pin, 19...
・Spring hook is a rod, 20... Spring hook is a rod % 21... Tightening spring, 22... Air supply pipe, 23... Knob, 24.
...Compression spring, 25...Piston plate, 26...Vent hole, 27...Check valve, 28...Pipe, 30...
Pipe, 31...Air discharge pipe, 32...Ink diffusion roller, 33...Roller support plate, 34...Pin, 35...Rotary copying machine main body, 36.37...Stock shaft Yaichi Pin, 38...Press roller, 39...Screen carrier, 40...Stencil.

Claims (1)

[Claims] A cylindrical plate cylinder with a large number of small holes for passing ink on its circumferential surface and whose inside is filled with printing ink. In a plate cylinder for color changing in a rotary copying machine, which has a handle for lifting the plate cylinder on a rotating shaft rotated by a prime mover,
An air supply pipe having a hollow rotating shaft and a check valve provided in the hollow part is rotatably inserted into the air supply pipe, a knob having a square cross section is fixed to the end of the air supply pipe, and the knob is further fixed to the end of the air supply pipe. A pressure expansion spring is installed inside the plate, and a piston plate having a ventilation hole in the center is slidably fitted thereinto, and a pipe is externally fitted to the inside of the plate cylinder of the air supply pipe, and Another pipe along the pipe is fixed, an air discharge pipe whose one end communicates with the air supply pipe is provided in the pipe, and an air discharge pipe made of two sheets and superposed on the pipe that is fitted onto the air pipe The base of a roller support plate is fixed to the base of the roller support plate, whose ends are pivotally connected with pins, and an ink whose outer circumferential surface is pressed against the circumferential surface of the plate cylinder when the roller support plate is straight is attached to the tip of the roller support plate. A plate cylinder for color change in a rotary copying machine, characterized by having a diffusion roller rotatably supported.