JPH07102693B2 - Printer - Google Patents

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 producing a color filter for liquid crystal display by a printing method, and more particularly to an inking mechanism thereof.

[0002]

2. Description of the Related Art A conventional general printing machine, in particular, an inking portion will be described. In FIG. 9, a mounting base 4a, an ink supply roller 5a, and a vibration roller 6a are provided as a set on a pedestal 9, and these rollers rotate together without being separated from each other, and the printing plate 2 is inked. I do. The attachment roller 4a at this time is
Generally, a plurality of fine rollers are used.
When replenishing ink, these roller groups 4a, 5a,
6a is integrated into a fixed roller group 5b, 6b, 7
It is designed to receive ink from b.

[0003]

According to the above-mentioned inking mechanism, the ink on the surface of the applying roller is uniform at the start of inking to the plate, but the inking roller starts to move after inking. When entering the turning eye, 1
The traces of the image on the surface of the roller on the rotation lines do not disappear, and they appear as uneven printing. 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 will return to the attaching roller as a mark. Eliminating this mark is the ultimate task of the printing machine. When a roller group reverses and reciprocates like a printing press,
Even more complicated traces appear.

It is an object of the present invention to provide a printing machine which eliminates printing unevenness caused by a roller mark on the surface of the applying roller.

[0005]

[Means for Solving the Problems] In order to prevent the roller trace (ghost) from appearing completely on the attaching roller,
It is desirable that the surface of the applying roller is always in a new state while inking the image area. For this reason, it is necessary to increase the diameter of the attaching roller so that it does not enter the second rotation. At this time, the other rollers that are in contact with the attachment roller must all have the same diameter so that the traces of the image on this roller do not shift, but this is the basic practice of kneading ink. It is impossible considering the function. Therefore, the structure is such that the applying roller is separated from other rollers during printing. Furthermore, it is used by controlling so that the mark on the attaching roller that does not occur when it is separated does not enter the printed image area.

[0006]

[Function] When the attachment roller is inking the image area on the plate, a new roller surface is always used, so inking can be performed evenly on the plate, and printing with uniform density can be achieved. It will be possible.

[0007]

EXAMPLE An example of the flatbed type lithographic offset printing machine of the present invention will be described with reference to FIGS. In the figure, 1 is an object to be printed such as glass, 2 is a printing plate, 3 is a blanket cylinder, 4 is an applying roller, 5 is an ink supply roller, 6 is a kneading roller, 7 is a vibration roller, 8 is an object to be printed 1, Frame with printing plate 2 attached,
Reference numeral 9 denotes a pedestal that supports the blanket cylinder 3, the attaching roller 4, and the like.

Next, the operation of this device will be described. In FIG. 2, the applying roller 4 is brought into contact with and rotated by the rotating ink supply roller 5, and the ink is evenly applied to the surface of the applying roller 4. At this time, the blanket cylinder 3 has the printing plate 2
Away from. In FIG. 3, the application roller 4 coated with ink is raised to stop the rotation. At this time, a linear mark T is generated at the bottom of the attaching roller 4.

In FIG. 4, the gantry 9 is moved to the left in the figure. The rollers 4 and 5 are separated from the printing medium 1 and the printing plate 2. During this time, the kneading 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 attaching roller 4 is lowered to bring the trace T into contact with the outside of the image area of the printing plate 2, the gantry 9 is continuously moved to the left, and the printing roller 2 is inked by the attaching 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 applying roller 4 is the printing plate 2
Ends inking. The trace T on the application roller 4 does not come into contact with the image area of the printing plate 2. After the inking is completed, the attaching roller 4 is raised. If necessary, the operations shown in FIGS. 2 to 6 are repeated several times to form a uniform ink film having a desired thickness on the printing plate 2. In FIG. 7, after moving the gantry 9 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 period, the image on the printing plate 2 is blanket cylinder 3
Is transcribed to.

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. Stand 9
To the right to return to the state of FIG.

[0012]

The printing machine according to the present invention comprises a printing medium and a printing plate which are installed horizontally side by side, a blanket cylinder and a mounting roller which move integrally on the printing medium and the printing plate. A printing method, comprising: an ink supply roller installed adjacent to the printing plate, the ink on the ink supply roller is supplied to the printing plate by the applying roller, and the image of the printing plate is transferred to a printing medium by the blanket cylinder. In the machine, the outer peripheral length of the application roller is made longer than the width of the image area of the printing plate, and when the application roller separates from the ink supply roller, the roller trace generated on the surface of the application roller is the same when contacting the printing plate. By being configured to be located outside the image area of the printing plate, it is possible to print the image surface of the printing plate evenly over the entire image surface on the printing medium such as glass. That.

[Brief description 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 machine of FIG.

FIG. 3 is a diagram showing a state in which a mounting roller is raised from the state of FIG.

FIG. 4 is a view showing a state in which a mounting roller is moved above the printing plate from the state of FIG.

FIG. 5 is a view showing a state in which the attaching roller is brought into contact with the printing plate from the state of FIG.

FIG. 6 is a diagram showing a state in which the attaching roller is moved to the left from the state of FIG. 5 and inking for the printing plate is completed.

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

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

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

[Explanation of symbols]

 1 Print substrate 2 Printing plate 3 Blanket cylinder 4 Mounting roller 5 Ink supply roller 9 Stand

Claims (1)

[Claims] 1. An object to be printed and a printing plate that are installed horizontally side by side, a blanket cylinder and a mounting roller that move integrally on the object to be printed and the printing plate, and adjacent to the printing plate. In a printing machine comprising an installed ink supply roller, the ink on the ink supply roller is supplied to the printing plate by the applying roller, and the image of the printing plate is transferred to the printing medium by the blanket cylinder in the printing roller. The outer peripheral length is made longer than the width of the image area of the printing plate, and the roller trace generated on the surface of the printing roller when the applying roller is separated from the ink supply roller is located outside the image area of the printing plate when the printing roller contacts the printing plate. A printing press characterized by being configured to be positioned.