JPH0334854A - Water supply apparatus in offset press - Google Patents

Abstract

PURPOSE:To stably keep the printing quality at the time of the beginning of printing by providing a cleaning roller so as to bring the same into elastic contact with a water stop roller. CONSTITUTION:The damping water in a water tub 2 is transmitted to the peripheral surfaces of a water fountain roller 5, a water stop roller 4 and a water applying roller 3 according to the rotation of these rollers to be supplied to the surface of a plate cylinder 1. The ink separately supplied to the surface of the plate cylinder 1 along with the damping water is adhered to the water applying roller 3 while the ink adhered to the water applying roller 3 gradually transfers to the water stop roller 4 and the ink adhered to the water stop roller 4 is transferred to the cleaning roller 6 rotating so as to follow the water stop roller 4 in an elastic contact state to remove the adhered ink from the water stop roller 4. A lever 12 is subjected to rising operation at a necessary time to forcibly rotate a cam 13 and, when the arm 8 in contact with the cam 13 is raised against the energizing force of a spring 11, the cleaning roller 6 is separated from the water stop roller to be held at a predetermined position. By this method, the work for removing the ink transferred and adhered to the cleaning roller is easily performed and stable printing is always continued.

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 together with ink to the plate surface of the plate cylinder, a water base roller, a drain roller, and a bathing roller are sequentially installed between the water bucket and the plate cylinder. A water supply device is installed so as to be able to rotate freely and continuously supply even dampening water.

Problems to be Solved by the Invention However, in the water supply device for the offset printing press mentioned above, ink supplied together with dampening water onto the plate surface of the plate cylinder adheres to the swimsuit roller, and the swimsuit roller The ink adhering to the roller gradually transfers to the draining roller, and the ink adheres to the draining roller.

The draining roller has an enlarged and roughened circumferential surface due to adhering ink, which obstructs the transmission of water to the water head roller, impedes the so-called water flow, and causes uneven water, which prevents water from flowing when printing begins. This is a factor that reduces print quality.

The present invention solves the problems described in 42 above in conventional offset printing machines, such as poor water supply and water unevenness, which have a negative impact on print quality, and maintains stable print quality at the start of printing. It is an object of the present invention to provide a water supply device for an offset printing press that can perform the following steps.

The configuration of the water supply device in the offset printing press according to the present invention for achieving the purpose of the first step to solve the problem is described in the first embodiment corresponding to the embodiment.
To explain with reference to FIGS.
In a water supply device for an offset printing press, a water supply device for an offset printing machine is provided, in which a bathing roller 3, a draining roller 4, and a water fountain roller 5 are arranged to rotate in contact with each other in order to continuously supply dampening water to the printing plate surface.
The invention is characterized in that a cleaning roller 6 is attached to the draining roller 4 so as to be in elastic contact with the draining roller 4.Next, the second invention provides a dampening roller 3 for continuously supplying dampening water to the plate surface of the plate cylinder l.
In a water supply device for an offset printing press, in which a drain roller 4 and a water base roller 5 are arranged so as to contact and rotate in sequence, a cleaning roller 6 is attached to the drain roller 4 so as to be able to slide back and forth. 6, and a third invention is such that a bathing roller 3, a draining roller 4, and a water head spout 5 for continuously supplying dampening water to the plate surface of the plate cylinder 1 are sequentially contacted and rotated. In the water supply device J5'=j disposed in an offset printing press designated by -C, a cleaning roller 6 is attached to the draining roller 4 so as to be in elastic contact with the draining roller 4 so as to be able to come into contact with and separate from the cleaning roller 6.

By the means described above, the ink that has landed on the drain roller 4 is transferred to the cleaning roller 6, which is provided in elastic contact with the drain roller 4, and is removed from the drain roller 4;
The first coat of ink can be removed.

As a result, the draining roller 4 can always keep its peripheral surface clean and the water can be stably transmitted from the water source roller 5 to the water source roller 5, so that the so-called water rise can be improved and the water well can be illuminated. The print quality at the beginning of printing can be maintained stably.

1- When the cleaning roller 6 is configured so as to be in elastic contact with the draining roller 4 so as to be able to slide back and forth, the contact peripheral surface of the cleaning roller 6 that is in elastic contact with the draining roller 4 is periodically rotated with a predetermined width. As a result, the ink transferred and adhered to the cleaning roller 6 from the draining roller 4 is spread in the width direction, and the interval between ink wiping operations on the peripheral surface of the cleaning roller 6 can be extended.

When the cleaning roller 6 is configured to be able to move toward and away from the draining roller 4, the cleaning roller 6 can be moved away from the draining roller 4 when necessary to wipe off ink that has been transferred and adhered to the circumferential surface of the cleaning roller 6. Descaling work can be done easily.

Embodiment To explain an embodiment of the present invention with reference to the drawings, in FIG. C1-ra4,
A cleaning roller 6 is attached to the draining roller 4 so as to be in elastic contact with the draining roller 4.

The cleaning roller 6 is connected to the draining roller 4 which makes elastic contact with it.
If the draining roller 4 is made of metal, it is preferably made of metal such as stainless steel or brass, and conversely, if the draining roller 4 is made of metal, it is preferably made of 2J'mu. It can be set.

As shown in FIGS. 2 and 3, the cleaning roller 6 is rotatably supported at the tip of an arm 8 which is pivotally supported on a support shaft 7 suitably fixed to the machine frame, etc. a shaft rod 10 rotatably supported by a fixed arm 9 fixed to the support shaft 7;
A compression spring 11 is engaged between the cleaning roller 6 and the arm 8, and the spring 11 urges the cleaning roller 6 to come into elastic contact with the draining row 4. The shaft 10 has a lever 12, and a cam 13 that comes into contact with the arm 8 is fixed 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.
While sliding reciprocally with respect to the draining roller 4 with a width of, for example, about 1 cm, using means such as drilling a roller and engaging the roller 16 provided on the inner circumferential surface of the cleaning roller 6 with the continuous groove 15. It is attached so that it makes elastic contact.

In the above configuration, the dampening water in the water pail 2 spreads around the circumferential surfaces of the water base roller 5, drain opening 4, and swimsuit roller 3 as they rotate in the directions of the arrows, as shown in the dots in Figure 1. and is supplied to the plate surface of the plate cylinder l. The ink that is separately supplied together with dampening water to the plate surface of the printing cylinder 1 lands on the swimsuit roller 3, and the ink adhering to the swimsuit wax 3 gradually moves to the draining roller 4.
The ink that has adhered to the draining roller 4 is transferred to the draining roller 4 (
The image is transferred to the cleaning roller 6 which comes into elastic contact and rotates as a result.
The attached ink can be removed from the draining roller 4.

1-3, if the cleaning roller 6 is now configured so as to be in elastic contact with the draining roller 4 so as to be able to slide back and forth as shown in FIG. When it rotates in a driven manner, it slides back and forth from side to side and periodically changes the contact peripheral surface with respect to the draining roller 4 by a predetermined width. It can be diffused in the circumferential width direction.

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 the cleaning roller 6 is moved up against the force, the cleaning roller 6 is separated from the draining roller 4 and held at a predetermined position. This causes the transfer from the draining roller 4 to the peripheral surface of the cleaning roller 6.
Removal work such as wiping off ink can be easily performed.

Effects of the Invention Since the present invention is as described above, it is possible to remove ink that adheres to the draining roller, improve water flow, eliminate water unevenness, and maintain stable printing at all times. -C6 has excellent effects that can be easily implemented for offset printing machines.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a configuration diagram, FIGS. 2 and 3 are partial perspective views showing how the cleaning roller is installed, and FIG. 4 is a portion of the cleaning roller. FIG. 1... Plate cylinder 2... Water bucket 3... Swimsuit roller 4... Draining roller 5... ・
Water head roller 6... ・Cleaning port・-Rough...Spindle
8...Arm 9...Fixed arm 10...
・Shaft rod 11... Spring ] 2... Lever 13... Cam 14... Fixed shaft 15... Continuous groove 16
... Trochanter 1 Fig. 2 Fig. 3 dゝ, sign spread 3-': 34854 (5) Fig. 4... JIL this. 5 Indication of procedural amendment case 1999 Patent Department No. 170603 Name of the invention Offsera;・Relationship with the case of person who amends the water supply device in 43 to a printing press Patent applicant address 1-120 Kitamachi, Nishi-ku, Nagoya City Name
Toshiaki Sa-machi

Claims (3)

[Claims] (1) In a water supply device for an offset printing press, in which a bathing roller 3, a draining roller 4, and a water base roller 5 are arranged to rotate in contact with each other in order to continuously supply dampening water to the printing surface of the printing cylinder 1, A water supply device for an offset printing press, characterized in that a cleaning roller 6 is attached to the draining roller 4 so as to make elastic contact therewith. (2) A water supply device for an offset printing press in which a bathing roller 3, a draining roller 4, and a watering roller 5 are arranged to rotate in contact with each other in order to continuously supply dampening water to the printing surface of the printing cylinder 1, A water supply device for an offset printing press, characterized in that a cleaning roller 6 is attached to the draining roller 4 so as to be able to slide back and forth in elastic contact therewith. (3) A water supply device for an offset printing press in which a bathing roller 3, a draining roller 4, and a watering roller 5 are arranged to rotate in contact with each other in order to continuously supply dampening water to the printing surface of the printing cylinder 1, A water supply device for an offset printing press, characterized in that a cleaning roller 6 is attached to the draining roller 4 so as to be in elastic contact with the draining roller 4 so as to be able to come into contact with and separate from the cleaning roller 6.