JPS63162246A - Impression cylinder washer of sheet-feed press - Google Patents

Abstract

PURPOSE:To prevent the adhesion of liquid to a position where a difficult occurs by exposure to the liquid and the decrease of washability by lessening the use quantity of the liquid, by a method wherein the surface of an impression cylinder in rotation is clearly wiped off with a brush and the brush is stopped by turning the circumferential surface of a brush roller into which the brush is not planted onto the impression cylinder side when no washing is performed. CONSTITUTION:A washing liquid feed pump 6 is operated and the washing liquid 4 is fed into a container. The filling quantity of the washing liquid is detected with liquid surface detecting switch 10 and the pump is stopped when coming full of a suitable quantity. The purpose of a check valve 11 is to prevent the reflux of filling liquid after stopping the pump. Then, the impression cylinder 1 is rotated, and at the same time, the brush roller 2 is also rotated to obtain a washing state. When the washing of the impression cylinder is completed, a motor 5 is stopped, and at the same time, a brake is also set. Then, a vacuum pump is actuated and the residual liquid in the container is extracted. As mentioned above, the washing of the impression cylinder is completed and the operation of printing is started again.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an impression cylinder cleaning device for a sheet-fed printing press.

[Conventional technology]

In the case of a sheet-fed printing press, there are various sizes of paper used for printing, from large to small in both length and width, and these are applied to one printing press.

In printing, paper is pressed between an impression cylinder and a blanket cylinder, and ink is transferred from the blanket cylinder to the paper surface.

When printing on paper that is smaller than the surface area of the impression cylinder, the surface of the impression cylinder that protrudes from the paper surface comes into direct contact with the blanket cylinder, and residual ink adheres thereto.

The remaining ink that has adhered and accumulated on the surface of the impression cylinder will adhere to the back side (the surface in contact with the impression cylinder) the next time a large sheet of paper is printed, and will stain it.

Therefore, after printing a small size paper, when switching the paper size to a large size paper and printing, it is necessary to always wipe the impression cylinder surface to remove residual ink (including paper powder, etc.).

In addition, in the case of a printing machine with a reversing function, for example, the first color printing unit prints the front side of the paper, then the paper is reversed during transport from the first color to the second color, and the paper is printed with the second color. Print on the back side. [Here] The undried ink on the front surface printed with a color comes into direct contact with the surface of the impression cylinder of the second color. As a result, the impression cylinder surface becomes dirty in the inlet.

As the dirt progresses, the remaining ink on the surface of the impression cylinder transfers to the paper surface.
This causes printing problems. Because of this, printing is frequently interrupted,
The impression cylinder surface will be wiped clean.

[Problem that the invention seeks to solve]

As mentioned above, it is necessary to occasionally wipe the surface of the impression cylinder in a sheet-fed printing press, but conventionally this cleaning work has been done manually, which has the following problems: 1) Impression cylinder The time required for wiping takes a large part of the time required to interrupt printing.

2) Impression cylinder cleaning currently relies entirely on manual labor.

The manual cleaning method involves soaking a cloth in cleaning liquid and bringing it into contact with the surface of the rotating impression cylinder to wipe off any remaining ink, but there is a risk of hands and fingers getting caught inside the printing machine. There are probably many.

[Means for solving the problem] (1) A brush impregnated with cleaning liquid is brought into contact with a rotating impression cylinder, and the remaining ink on the surface of the impression cylinder is temporarily transferred to the brush.

(2) Next, soak the brush stained with the remaining ink in the cleaning liquid, and remove the dirt from the brush into the cleaning liquid.

(3) The above operation (11) (210) is performed by rotating the brush roller to automatically clean the impression cylinder and also serve to clean the brush itself.

(4) Next, during the cleaning pause, the rotation of the brush roller is stopped when the surface around the brush roller where the brush is not implanted faces the impression cylinder side. This creates a state in which the brush and impression cylinder do not come into contact with each other, that is, a rest state.

[For production]

A brush containing cleaning liquid wipes the impression cylinder surface.

Dirt on the surface of the impression cylinder transferred to the brush is washed away by the cleaning liquid. A liquid level sensor controls the cleaning liquid level to a position where the brush is constantly immersed.

The rotational phase detector of the brush roller stops the brush roller with the circumferential surface of the brush roller in which no brushes are embedded facing the impression cylinder side, that is, in a state where the brush does not contact the impression cylinder surface, during a cleaning pause. .

〔Example〕

In Figure 1, 1 is the impression cylinder, la is the bim cylinder, lb is the plate cylinder,
2 is a brush roller in which a brush 2a is partially embedded on the circumference of the roller. 3. Store the cleaning solution.

Container for. 4 is cleaning liquid. An organic solvent such as kerosene is used as the cleaning liquid.

4 is a side view of FIG. 1, and 5 indicates a motor for rotating the brush roller 2. FIG. 6 is cleaning liquid 4 in container 3
7 shows a vacuum pump unit for drawing out the cleaning liquid 4 from the container 3. A cyclone 8 and a mist separator 9 are provided in the middle of the piping from the vacuum pump unit to the container 3 to separate the liquid from ink/paper powder residue. 10 is a detector for detecting the liquid level, and is used to automatically maintain the cleaning liquid supplied from the 6 pump units at an optimum level. Reference numeral 12 denotes a detector for detecting the rotational phase of the brush roller, that is, whether or not the side where the brush is installed is facing the impression cylinder side, and for stopping the brush roller 2 in the cleaning pause phase.

The state shown in FIG. 1 shows that the cleaning liquid 4 has been completely supplied into the container 3, and the liquid is contained in the brush 2a using capillary action. The figure also shows a state in which ink adhering to the brush 2alC is being washed off with a solvent.

In the state shown in Fig. 2, the brush 2a is brought into contact with the rotating impression cylinder l, and the liquid contained in the brush 2a is transferred to the impression cylinder surface.
This shows a state in which the ink is dissolved and the brush 2a is scraping off the dissolved ink.

The state shown in FIG. 3 shows the state in which cleaning of the impression cylinder 1 has been completed and the residual cleaning liquid in the container is vacuumed out (to prevent fire) and is waiting for re-cleaning. Next, the automatic impression cylinder cleaning procedure will be explained.

From the state shown in FIG. 3, the cleaning liquid supply pump 6 is operated to feed the cleaning liquid 4 into the container. A liquid level detection switch 10 detects the amount of cleaning liquid filled, and when the appropriate amount is filled, the operation of the pump is stopped. The check valve 11 is used to prevent backflow of the filling liquid at the pump stop stage.

Next, the impression cylinder 1 is rotated and the brush roller 2 is also rotated to obtain the cleaning conditions shown in FIGS. 1 and 2.

When cleaning of the impression cylinder is completed, the motor 5 is stopped in the state shown in FIG. 3, and the brake is also applied.

Next, operate the vacuum pump to remove the remaining liquid from the container.

Note that drying air may be blown onto the surface of the impression cylinder 1 that has been completely cleaned to dry the cleaning liquid adhering to the impression cylinder 1. It is also conceivable to provide a gap in the ink tank to make it easier for the remaining ink adhering to the brush roller to dissolve into the cleaning solution.

With the above steps, the impression cylinder cleaning is completed and printing work can be resumed.

〔Effect of the invention〕

The method of cleaning with an impregnated brush as in the present invention has the following advantages compared to the method of directly spraying the cleaning liquid onto the impression cylinder surface using a nozzle etc.: 1) The amount of liquid used is small. I'll try it.

2) It is possible to prevent the liquid from adhering to the notch of the impression cylinder and the sliding part of the pawl shaft, which would otherwise cause problems.

3) The atomized liquid sprayed directly scatters to areas other than the impression cylinder surface, staining the floor of the printing press, etc. This also prevents the liquid from vaporizing and catching fire.

In the method of the present invention, in which brushes are planted only in a part of the periphery and part of the brushes are immersed in liquid, a roller with brushes planted all around the roller is brought into contact with the impression cylinder surface, and this brushing is carried out. This method has the following advantages over the method: 1) The brush contaminated with ink transferred from and attached to the impression cylinder can be washed off in the state shown in Fig. 1, and a decrease in cleaning performance can be prevented.

2) Also, there is no need to newly install a cleaning device for cleaning the brushes, which is advantageous in terms of cost.

3) A standby state (the state shown in FIG. 3) during printing work can be easily created. In the case of a full-circumference brush, it is necessary to newly provide a dedicated attachment/detachment device in order to obtain the two states of contact and separation with the impression cylinder, resulting in high costs.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the impression cylinder cleaning device for a sheet-fed printing press according to the present invention, in which a container is filled with cleaning liquid and a brush is immersed in the cleaning liquid. FIG. 2 shows the apparatus shown in FIG. 1 in a state where residual ink on the impression cylinder is being cleaned with a brush. Figure 3 shows fa
The apparatus shown in FIG. 1 is shown in a state where cleaning has been completed and printing is in progress. FIG. 4 shows a side view of the device of FIG. 1... Impression cylinder 2... Brush roller 2a
... Brush 3 ... Container 4 ... Cleaning liquid
5...Motor 10...Liquid level 1 detector 12...Rotation phase detector Sub-agent Patent attorney 2 persons other than Kaimoto Important Cultural Property

Claims (1)

[Claims] A brush roller having brushes partially embedded in the circumferential surface of the roller, a motor for rotating the brush roller, a container filled with cleaning liquid so as to be in contact with the brush, and a detector for detecting the rotational phase of the brush roller. and a detector for detecting the liquid level in the cleaning liquid container, the rotating impression cylinder surface is wiped by the brush, and when cleaning is stopped, the circumferential surface of the brush roller where no brush is installed is wiped by the impression cylinder. An impression cylinder cleaning device for a sheet-fed printing press, characterized in that it stops facing toward the side.