JPS6161857A - Letterpress printing machine equipped with automatic cleaning device of plate - Google Patents

Abstract

PURPOSE:To make the plate on a plate cylinder is automatically cleaned after inking arrangement is separated from the plate cylinder while the printing is stopped, by a method wherein a plate cleaning device is annexed at the adjoining position so as to be possible to detached to the plate attached on the plate cylinder. CONSTITUTION:When the printing operation is suspended or finished, an anilox roll 6 of a inking arrangement is detected how it is separated with the plate, and when it is completely separated, the cleaning device which was at the original position of a moving guide frame 10, operates an air cylinder and the like by getting a sign of inking arrangement is completely separated, and makes the cleaning device moving to the operating position of the moving guide frame, and while a cleaning brush 12 of plate cleaning device, a squeegee roll 13 and a squeezing roll 14 etc. are operated, a motor for driving the plate cylinder of the printing starts rotation, and the cleaning of the plate is performed. After the cleaning operation is finished, the driving of the plate cylinder and the plate cleaning device is stopped and the cleaning device is moved to the original position.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a letterpress printing machine equipped with a printing plate cleaning device, and particularly provides a letterpress printing machine that automatically cleans the printing plate when printing is stopped. This is what I am trying to do.

In letterpress printing, especially in letterpress printing that uses relatively quick-drying printing ink, the ink adhering to the printing plate must be washed or washed when printing is stopped, such as when printing is interrupted or when printing is finished.
It is necessary to carry out work such as removing the dirt.

If ink is left on the plate and left unattended, the ink will stick to the plate and dry, causing plate jams and scratches, resulting in a decrease in printing quality, but this can be prevented. Therefore, in the past, the printing operator had to clean the plate surface with an appropriate cleaning liquid every time printing was stopped, which significantly reduced work efficiency.

Especially in the case of letterpress printing machines consisting of multiple printing units.
Each time printing is stopped, the connection between each unit is released, and an operator enters during this time to perform cleaning work. When marking #J is restarted from 〇n after cleaning, the space between each unit is opened for cleaning, and as a result, the adjusted register is also released, causing misregistration, which necessitates registration work again, increasing paper waste. , which leads to a decrease in workability.

The present invention was made to solve the above-mentioned problem when printing is stopped. Immediately after printing is stopped, the ink adhered to the printing plate can be easily reduced to 13ti with a relatively simple operation.
e In consideration of the removal potential, the plate surface is automatically cleaned by attaching a removable surface cleaning device to the plate cylinder.

That is, the present invention provides a printing plate cleaning device mainly consisting of a plate cleaning member, a plate squeegee roll, and a squeegee four squeeze roll, which are removably adjacent to the printing plate mounted on the plate cylinder. Letterpress printing equipped with an automatic printing plate cleaning device, characterized in that the printing plate on the printing plate is automatically cleaned after the inking device is detached from the plate cylinder when printing is stopped. The aim is to provide an opportunity.

Hereinafter, a letterpress printing press equipped with an automatic printing plate cleaning device according to the present invention will be described in more detail with reference to the drawings.

FIG. 1 shows an example of a flexographic letterpress printing machine in which a printing plate Wh cleaning device is attached to one printing unit.

In FIG. 1, (A+) indicates one printing unit of a letterpress printing press, and (B) indicates an integrated example of a printing plate cleaning device attached to the unit.

In the printing unit (A), 1 is an impression cylinder, 2 is a plate cylinder, and 3 is a flexographic inking device. Further, 4 indicates a printing plate mounted on the plate cylinder, and 5 indicates a printing medium. Also, the inking device 3 is anilox! - roller 6, fountain roller 7 and ink pan 8, and if necessary also a doctor 9 for supplying ink lIiIIm.

Note that in a multicolor printing press, a plurality of printing units having the above configuration are connected to perform printing.

The printing plate cleaning device according to the present invention is attached to a position adjacent to the plate cylinder 2, and needs to be installed at a position that does not interfere with connection with other printing units, for example. The printing plate cleaning device U (Bl) is slidably mounted on the movable guide table 10, and is attached to and detached from the plate cylinder using, for example, an air cylinder (not shown).

In the printing plate cleaning device, 11 is a cleaning liquid storage tank, and 12 is a cleaning liquid storage tank.
shows a cleaning plan for a printing plate cleaning member, which cleans the printing plate while holding a cleaning liquid.

Although a brush is shown in the figure as a plate surface cleaning member, other means such as spraying can also be used for cleaning.

13 is a squeegee to remove cleaning liquid etc. adhering to the printing plate 4.
A squeegee roll is used to remove the dirt by removing it, and a roll having an absorbent material such as Molton or sponge on the surface can be used. 14 is the wash sucked into the squeegee roll [! A squeeze roll is shown for squeezing and removing t;
The cleaning liquid and the like are poured into the cleaning liquid storage tank 11 mentioned above. 15 is! ! This is a shielding plate to prevent cleaning liquid from the printing plate cleaning member from transferring to the squeegee roll.

Further, 16 indicates piping for supplying cleaning liquid to the squeegee roll, and a pump 17 supplies new cleaning liquid quantitatively supplied from a cleaning liquid tank or the like (not shown) to a liquid reservoir 18 on the surface of the squeegee roll. The purpose is to clean the rolls. Note that the cleaning liquid is supplied from a cleaning liquid tank or the like through a pipe 16 and stored in a cleaning liquid storage tank, and is used for cleaning the printing plate. Further, the contaminated liquid after cleaning is discharged from the storage tank 11 through the drain pipe 19 in the form of an overflow.

Note that 20 indicates an outer frame of the printing plate cleaning device, and detection sensors 21 and 22 for detecting movement of the printing plate cleaning device are provided at the lower part of the outer frame and at both ends of the movement guide frame. ing.

FIG. 2 is a flowchart showing the operation of the printing plate cleaning device according to the present invention, in which when printing work is interrupted or finished, it is detected whether the anilox roll, which is an inking device, has separated from the printing plate; When the weir is completely discharged (steps ① to ②), the cleaning device starts operating.

First, the original position of the movement guide frame lO (the leftmost position in the figure is
The cleaning device that was located in the position W (which corresponds to the far right in the figure) receives a symbol indicating that the inking device has been removed, operates the air cylinder, etc., and moves the cleaning device to the working position W (corresponding to the far right in the figure) of the moving guide frame. The sensor 22 confirms the movement.

(Steps ■～■) The cleaning plan for the cleaning device 1Ivk, printing 1+12, the squeegee roll, squeezing roll, etc. move, the motor for driving plate W4 of the printing machine starts rotating, and the printing plate is cleaned. be exposed. To confirm the completion of the cleaning work, determine the required time or the required number of rotations of the plate cylinder in advance so that you can detect the completion of the cleaning work (Steps ■ to ■). Stop the drive of the cylinder and printing plate cleaning device Step ~ [Phase]
) Move the pre-cleaning device to the 7G position, and when the movement is complete, the cleaning work is finished.

Thereafter, a state of waiting for a signal indicating the start of mark # is maintained. (
Step @) With the above-described operation, the cleaning work of the printing plate is automatically performed at the same time as printing is stopped.

FIG. 3 shows a 111111 block diagram for the above operation.

As shown in Figure 3, when a print stop signal is issued to the main control panel, the air cylinder performs the gl operation from the plate cylinder of the inking device, and based on the completion signal, the cleaning device control W is activated to perform the cleaning operation. 1! A disclosure signal will be transmitted and cleaning will occur according to the process described above.

By attaching the automatic printing plate cleaning device having the above-mentioned configuration to the printing unit, conventional manual labor of 1 t@I,
The cleaning work that had been done, and even the re-adjustment of the role! Since the trouble of [[] is completely eliminated, it is expected that the efficiency of printing work will be greatly improved.

[Brief explanation of the drawing]

Figure 1 shows a specific example of a letterpress printing machine equipped with a printing plate cleaning device according to the present invention, Figure 2 is a flowchart for its operation, and Figure 3 is a block diagram for 1I11 U. The figure is shown below. The symbols in the figure indicate the following. A...Printing unit B...Printing plate cleaning device 1, pressure cylinder 2--, plate cylinder 3, inking device 4, printing plate 5, printing material 6. Anilox roll fan roller 8... Ink pan 9... Doctor blade 10... Moving guide table 11... Cleaning liquid storage tank 12... Plate cleaning member 13 -... Squeegee roll 14... Squeezing roll 15...l! Shielding plate 16 ・ ... ・ Piping 17
・・・・・・ Pump 18 ・ ・
・・Liquid reservoir 19・・・Drain pipe 20・・−Outer frame 21.22・・・Sensor rod 2 times

Claims (1)

[Claims] (1) In a letterpress printing machine that mainly consists of a plate cylinder, an impression cylinder, and an inking device, printing that mainly consists of a plate cleaning member, a plate squeegee roll, and a squeeze roll for the squeegee roll, located adjacent to the plate cylinder. A plate cleaning device is attached, and after the inking device is detached from the plate cylinder when printing is stopped, the printing plate cleaning device automatically moves to the printing plate to clean the printing plate. A letterpress printing machine equipped with an automatic printing plate cleaning device.