JPH04323043A - Printing press - Google Patents

Abstract

PURPOSE:To perform uniform inking on a plate and to obtain a printing state of uniform density by always using the new surface of a form roller when inking is applied to the image region on the plate by the form roller. CONSTITUTION:A form roller 4 is brought into contact with a rotating ink supply roller 5 under rotation to uniformly apply ink to the surface of the form roller 4. Thereafter, the form roller 4 is raised and the rotation thereof is stopped. Next, a stand 9 is moved to the left to lower the form roller 4 and, in such a state that a mark T is brought into contact with the outside of the image region of a printing plate 2, the stand 9 is moved to the left and inking is applied to the printing plate 2 by the form roller 4. After the stand 9 is moved to the right, a blanket cylinder 3 is allowed to fall to be brought into contact with the printing plate 2 and, by moving the stand 9 to the left, the image of the printing plate 2 is transferred to the blanket cylinder 3 and, by continuously moving the stand 9 to the left, said image is transferred to an object 1 to be printed.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing machine used for manufacturing color filters for liquid crystal displays by a printing method, and particularly to an inking mechanism thereof.

0002

2. Description of the Related Art A conventional general printing press, and in particular an inking section, will be explained. In FIG. 9, a mounting roller 4a, an ink supply roller 5a, and a vibration roller 6a are installed as a set on a pedestal 9, and these rollers rotate together without separating from each other, and ink the printing plate 2. I do. At this time, the attachment roller 4a is
It is common to use multiple fine rollers. When replenishing ink, these roller groups 4a, 5a,
6a are integrated into fixed roller groups 5b, 6b, 7.
It is designed to receive ink from b.

0003

[Problems to be Solved by the Invention] According to the above-mentioned inking mechanism, the ink on the surface of the applicator roller is uniform when inking the plate starts, but after inking starts, the applicator roller When the rotation begins, 1
The image marks on the roller surface that are left on the rotating surface do not disappear and appear as printing unevenness. In order to erase these
The kneading roller is combined with the vibration roller, but this mark also extends to the kneading roller, and after one rotation, it returns to the marking roller as a mark, and erasing this mark is the ultimate challenge for printing machines.Furthermore, the liquid crystal display When the roller group reverses and moves back and forth, as in a commercial printing press, even more complex marks are produced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printing press that eliminates printing unevenness caused by roller marks that occur on the surface of the application roller.

[0005]

[Means for solving the problem] In order to completely prevent the above-mentioned roller marks (ghosts) from appearing on the attachment roller,
It is desirable that the surface of the application roller be in a fresh condition at all times while inking the image area. For this reason, it is necessary to increase the diameter of the application roller to prevent it from entering the second rotation. At this time, the other rollers that are in contact with the applicator roller must all have the same diameter so that the image marks on this roller do not shift, but this is due to the basic principle of kneading the ink. This is impossible considering the function. Therefore, the application roller is separated from other rollers during printing. Furthermore, it is used under control so that the marks on the application roller that are created when the paper is separated do not enter the print image area.

[0006]

[Operation] When the application roller is inking the image area on the plate, a new roller surface is always used, so it is possible to ink evenly on the plate and print with uniform density. It becomes possible.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a flatbed lithographic offset printing press according to the present invention will be described with reference to FIGS. 1 to 8. In the figure, 1 is a printing material such as glass, 2 is a printing plate, 3 is a blanket cylinder, 4 is an application roller, 5 is an ink supply roller,
6 is a kneading roller, 7 is a vibration roller, 8
numeral 9 is a frame to which the printing material 1, printing plate 2, etc. are attached; numeral 9 is a pedestal for supporting the blanket cylinder 3, application roller 4, etc.;

Next, the operation of this device will be explained. In FIG. 2, the coating roller 4 is brought into contact with the rotating ink supply roller 5 and rotated to uniformly apply ink to the surface of the coating roller 4. At this time, the blanket cylinder 3 is connected to the printing plate 2.
away from In FIG. 3, the application roller 4 coated with ink is raised and its rotation is stopped. At this time, a linear mark T is generated at the bottom of the application roller 4.

In FIG. 4, the pedestal 9 is moved to the left in the figure. The rollers 4, 5 are spaced apart from the printing medium 1 and the printing plate 2. During this time, the mixing roller 6 and the ink supply roller 5 continue to rotate, and a uniform ink film is formed on the surface of the ink supply roller 5. In FIG. 5, the application roller 4 is lowered to bring the trace T into contact with the outside of the image area of the printing plate 2, and the pedestal 9 continues to move to the left, and the printing plate 2 is inked by the application roller 4. During this time, the blanket cylinder 3 is separated from the printing medium 1 and the printing plate 2.

In FIG. 6, the application roller 4 is attached to the printing plate 2.
Finish inking for. The marks T on the applicator roller 4 do not come into contact with the image area of the printing plate 2. After inking, the application roller 4 is raised. If necessary, the operations shown in FIGS. 2 to 6 described above are repeated several times to form a uniform ink film of a required thickness on the printing plate 2. In FIG. 7, after the gantry 9 is moved to the right, the blanket cylinder 3 is lowered and brought into contact with the printing plate 2, and then the gantry 9 is moved to the left. During this time, the image on printing plate 2 is transferred to blanket cylinder 3.
transcribed into.

In FIG. 8, the gantry 9 continues to move to the left, and the image on the blanket cylinder 3 is transferred to the printing medium 1. After the transfer is completed, the blanket cylinder 3 is raised. Frame 9
is moved to the right to return to the state shown in FIG.

0012

Effects of the Invention The printing press according to the present invention includes a printing medium and a printing plate that are arranged horizontally, a blanket cylinder and an application roller that move integrally over the printing medium and the printing plate; an ink supply roller installed adjacent to the printing plate, the application roller supplies ink on the ink supply roller to the printing plate, and the blanket cylinder transfers the image on the printing plate to a printing material. In the machine, the outer circumferential length of the applicator roller is made longer than the width of the image area of the printing plate, and when the applicator roller leaves the ink supply roller, the roller marks generated on the surface of the applicator roller come into contact with the printing plate. By configuring the printing plate to be located outside the image area of the printing plate, the image surface of the printing plate can be printed uniformly over the entire image surface on a printing medium such as glass.

[Brief explanation of drawings]

FIG. 1 is a front view showing the configuration of an embodiment of the present invention.

FIG. 2 is a diagram showing a state in which ink is supplied to an application roller in the printing press of FIG. 1;

FIG. 3 is a diagram showing a state in which the application roller is raised from the state in FIG. 2;

FIG. 4 is a diagram showing a state in which the application roller has been moved above the printing plate from the state in FIG. 3;

FIG. 5 is a diagram showing a state in which the application roller is brought into contact with the printing plate from the state shown in FIG. 4;

6 is a diagram showing a state in which the application roller is moved to the left from the state shown in FIG. 5, and inking on the printing plate is completed.

FIG. 7 is a diagram showing a state in which the pedestal is moved to the right from the state in FIG. 6 and the blanket cylinder is brought into contact with the printing plate.

8 is a diagram showing a state in which the gantry is moved to the left from the state in FIG. 7, and printing on the printing material by the blanket cylinder is completed; FIG.

FIG. 9 is a front view showing the configuration of a conventional printing press.

[Explanation of symbols]

1　Printing material 2 Print version 3 Blanket body 4 Attachment roller 5 Ink supply roller 9 Mount

Claims (1)

[Claims] Claim 1: A printing medium and a printing plate installed horizontally, a blanket cylinder and an application roller that move integrally over the printing medium and the printing plate, and a blanket cylinder and an application roller that are adjacent to the printing plate. an ink supply roller installed;
In a printing machine in which the application roller supplies ink on the ink supply roller to the printing plate, and the blanket cylinder transfers the image on the printing plate to the printing material, the outer circumference length of the application roller is defined as the width of the image area of the printing plate. When the applicator roller supplies ink to the printing plate, it is separated from the ink supply roller, and when the applicator roller separates from the ink supply roller, the roller marks created on the surface of the applicator roller are used to prevent ink from being applied to the printing plate. A printing machine characterized by controlling the roller attached to the printing plate when it comes into contact with the printing plate by preventing it from entering the printing plate during feeding.