JPH0373344A - Water supply system in offset press - Google Patents

Abstract

PURPOSE:To remove ink adhering on a water source roller, to improve water drainage and to continue stable printing at all times by annexing a cleaning roller 6 to the water source roller so as to be elastically contacted in a reciprocative slidable manner or a separable touchable manner. CONSTITUTION:A water attaching roller 3, a water-draining roller 4 and a water source roller 5 are disposed between a plate cylinder 1 and a water gutter 2 so as to be contacted and turned successively in order to continuously supply dampening water to the printing plate of the plate cylinder 1, and a cleaning roller 6 is annexed so as to be elastically contacted with the water source roller 5. Ink separately fed to the printing plate of the plate cylinder 1 is transferred gradually to the water attaching roller 3, the water-draining roller 4 and the water source roller 5 and ink is attached, but ink is transferred and moved to the cleaning roller 6 and can be removed. When the cleaning roller 6 is annexed to the water source roller 5 so as to be elastically contacted in a reciprocative slidable manner or a separable touchable manner, a contacting circumferential surface is changed periodically and transferred and attached ink is diffused, or the removal work of transferred and attached ink can be conducted easily.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a water supply device in an offset printing press.

Conventional technology In offset printing machines, in order to supply dampening water along with ink to the plate surface of the plate cylinder, a water base roller, draining roller, and bathing roller are successively rotated in contact between a water bucket and the plate cylinder. A water supply device is provided which is arranged so as to continuously supply uniform dampening water to one plate surface.

Problems to be Solved by the Invention Silently, in the water supply device of the above-mentioned offset printing press, ink supplied together with dampening water onto the plate surface of the first plate cylinder adheres to the swimsuit roller; The ink gradually transfers to the drain roller and then to the water base roller, causing the ink to adhere to the water base roller. Mizumoto Laura is
Due to the adhesion of ink, the roller circumferential surface becomes enlarged and roughened,
This impedes the raising and transmission of water from the water pail, resulting in poor water flow and uneven water flow, which is a factor in degrading print quality at the beginning of printing.

The present invention solves the above-mentioned problems of poor water supply in the water supply device and occurrence of water unevenness in conventional offset printing machines, which adversely affect print quality, and makes it possible to stably maintain print quality at the start of printing. The object of the present invention is to provide a water supply device for an offset printing machine.

Means for Solving the Problems In order to achieve the above object, the configuration of the water supply device in the offset printing press according to the present invention is described in the first embodiment corresponding to the embodiment.
To explain using Figures to Figure 4, the first invention is a one-plate cylinder
Swimsuit roller 3. to continuously supply dampening water to the plate surface. A water supply device for an offset printing press having a drain roller 4 and a water head roller 5 is characterized in that a cleaning roller 6 is attached so as to be in elastic contact with the water head roller 5. A swimsuit roller is used to continuously supply dampening water to the plate surface of the first plate cylinder 3. A water supply device for an offset printing press having a drain roller 4 and a water head roller 5, characterized in that a cleaning roller 6 is attached to the water head roller 5 so as to be able to slide back and forth in elastic contact with the water head roller 5.
The third aspect of the invention is a bathing roller 3, a draining roller 4. A water supply device for an offset printing press having a water head roller 5 is characterized in that a cleaning roller 6 is attached to the water head roller 5 so as to be able to come into and out of elastic contact with the water head roller 5.

Operation By using the above-mentioned means, first, since the cleaning roller 6 is attached to the water base roller 5, the cleaning roller 6 is attached to the water base roller 5, so that the cleaning roller 6 is not disposed on the inner circumferential surface of the water base roller 5, which is the water transmission route, but rather on the water transmission route. The cleaning roller 6 can be attached to a position easily secured on the outer peripheral surface of the water source roller 5, which can secure an attachment space. Therefore, the existing rotational directions of each of the first plate cylinder 1, swimsuit roller 3, drain roller 4, and water base roller 5 can be maintained as they are.

Then, from the plate surface of the plate cylinder L, the swimsuit roller 3 and the draining roller 4 are
The ink that has migrated and adhered to the water base roller 5 is transferred to a cleaning roller 6 attached to the water base roller 5 so as to come into elastic contact with the water base roller 5, so that the adhered ink can be removed from the water base and the roller 5.

As a result, the water base roller 5 can always keep its surrounding surface clean and can continue to steadily raise and transmit water from the water pail 2, so that the so-called water rise can be improved and water unevenness can be eliminated. The print quality at the time of printing can be maintained stably.

When the cleaning roller 6 is attached so as to be in elastic contact with the water base roller 5 so as to be able to slide back and forth, the contact peripheral surface of the cleaning roller 6 that comes into elastic contact with the water base roller 5 changes periodically with a predetermined width. Therefore, the ink transferred and adhered to the cleaning roller 6 from the water base roller 5 is spread in the width direction, and the interval between ink wiping operations on the circumferential surface of the cleaning roller 6 can be prolonged.

When the cleaning roller 6 is configured to be able to approach and separate from the water base roller 5, the ink transferred and adhered to the circumferential surface of the cleaning roller 6 can be wiped off by moving the cleaning roller 6 away from and separating from the water base roller 5 when necessary. Removal work such as the following can be easily performed.

Embodiment To explain the embodiment of the present invention with reference to the drawings, in FIG. A roller 4 and a water head roller 5 are arranged so as to rotate in contact with each other sequentially, and a cleaning roller 6 is attached to the water head roller 5 so as to come into elastic contact with the water head roller 5.

The cleaning roller 6 is made of metal such as stainless steel or cast iron when the water base roller 5 is made of rubber, and conversely, it is made of rubber when the water base roller 5 is made of metal. is a desirable configuration, and its material, dimensions, etc. can be set as appropriate.

As shown in FIGS. 2 and 3, the cleaning roller 6 is rotatably supported on the tip of an arm 8 which is pivotally supported on a support shaft 7 suitably fixed to the machine frame, etc. A compression spring 11 is engaged between the arm 8 and a shaft rod 10 which is rotatably supported on a fixed arm 9 fixed to the support shaft 7, and the cleaning roller 6 is attached by the spring 11. It is configured to come into elastic contact with the spring water base roller 5. The shaft 10 has a lever 12, and a cam 13 that abuts the arm 8 is fixedly mounted on the shaft 10.

The cleaning roller 6 also has an arm 8 as shown in FIG.
A continuous corrugated groove 15 is formed on the circumferential surface of the fixed shaft 14 on which the cleaning roller 6 is fitted so that it can rotate freely.
By using a means such as drilling a groove and engaging a trochanter 16 provided on the inner circumferential surface of the cleaning roller 6 with the continuous groove 15, the roller 5 is slid back and forth with a width of, for example, 1 crn. It is attached so that it makes elastic contact while

In the above configuration, the cleansing water in the water pail 2 is transferred to the water source roller 5 as shown by the dotted line in FIG. The ink that is separately supplied with dampening water to the printing surface of the 8th printing cylinder 1 is transmitted to the printing surface of the #i cylinder 1 by transmitting the peripheral surfaces of the draining roller 4 and the bathing roller 3 as they rotate in the directions of the arrows. The ink that adheres to the swimsuit roller 3 gradually transfers to the drain roller 4 and the water base roller 5, causing the ink to adhere to the water base roller 5, but the ink adheres to the water base roller 5. The attached ink is transferred 18 F to the cleaning roller 6 which is driven to rotate in elastic contact with the water base roller 5, and the adhering ink can be removed from the water base roller 5.

Here, if the cleaning roller 6 is attached so as to be in elastic contact with the water base roller 5 so as to be able to slide back and forth as shown in FIG. 4, the cleaning roller 6 will be in elastic contact with the water base roller 5 and rotate as a result At this time, it slides back and forth from side to side to periodically change the contact peripheral surface with the water base roller 5 by a predetermined width, so that the ink transferred and adhered from the water base roller 5 to the cleaning roller 6 is spread in the width direction of the peripheral surface. can do.

When necessary, the lever 12 is moved up to forcibly rotate the cam 13, and the arm 8 that comes into contact with the cam 13 is moved by the spring 11.
If you move it up against the urging force of.

The cleaning roller 6 is separated from the water base roller 5 and held at a predetermined position. Thereby, removal work such as wiping off the ink transferred and adhered to the peripheral surface of the cleaning roller 6 from the water source roller 5 can be easily performed.

Effects of the Invention Since the present invention is as described above, it is possible to remove ink adhering to the water base roller, improve water flow, eliminate water unevenness, maintain stable printing at all times, and improve existing printing methods. It has excellent effects that can be easily applied to offset printing machines.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present invention, in which FIG. 1 is a configuration diagram, FIGS. 2 and 3 are partial perspective views showing the installation state of the cleaning roller, and FIGS. FIG. 4 is a partial sectional view of the cleaning roller. l...Print cylinder 2...Water bucket 3-...Swimwear roller 4...Draining roller 5, 7, 9, 11, 13, 15, water base roller, support shaft, fixed arm, spring, cam, Continuous groove 6 ・ 8 ・ l O・ l 2 ・ l 4 ・ 16 ・・Cleaning roller・arm・shaft rod・lever・fixed shaft・trochanter Fig. 2 Fig. 3

Claims (1)

Scope of Claims (1) In a water supply device for an offset printing press having a bathing roller 3, a draining roller 4, and a water base roller 5 for continuously supplying dampening water to the plate surface of the plate cylinder 1, the water base roller 5
A water supply device for an offset printing press, characterized in that a cleaning roller 6 is attached so as to come into elastic contact with the water supply device. (2) In a water supply device for an offset printing press having a bathing roller 3, a drain roller 4, and a water base roller 5 for continuously supplying dampening water to the plate surface of the plate cylinder 1, a cleaning roller 6 is connected to the water base roller 5. A water supply device for an offset printing press, characterized in that it is attached so as to be in elastic contact so as to be able to slide back and forth. (3) In a water supply device for an offset printing press having a bathing roller 3, a drain roller 4, and a water base roller 5 for continuously supplying dampening water to the plate surface of the plate cylinder 1, the water base roller 5
A water supply device for an offset printing press, characterized in that a cleaning roller 6 is attached so as to be able to come into and out of elastic contact with the cleaning roller 6.