JPH0976466A - Printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing machine which can shorten a time to be taken for exchanging a printing color and can be operated efficiently. SOLUTION: Two ink devices 10 and 20 are provided in a relating manner on a plate cylinder 3. When the ink device 10 is operated, an ink of different color is put into the ink device 20 so as to prepare for exchanging a printing color. During the exchange of the printing color, the operating ink device 10 is stopped and the ink device 20 is operated so as to improve an operation rate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing machine for supplying ink onto the plate surface of a plate cylinder and transferring the ink image onto a printing material such as paper.

[0002]

2. Description of the Related Art In an inking device for supplying ink to a plate cylinder of a printing machine, ink attached to the outer periphery of a fountain roller is passed to a plurality of kneading rollers via a transfer roller which is swingably supported. The multi-roller method in which the ink kneaded by the kneading roller is supplied onto the plate surface of the plate cylinder through the inking roller, and the excess ink adhering to the outer circumference of the anilox roller is scraped off with a doctor, A flexo system is known in which the ink that enters the depression is supplied onto the plate surface of the plate cylinder through an inking roller.

The multi-roller type inking device has a feature that ink of high viscosity can be used.
Since the contact position between the ink supply portion of the printing plate attached to the plate cylinder and the receiving roller is not constant, there is a problem that a ghost is likely to occur on the printed matter.

On the other hand, in the flexo type inking device, since a fixed amount of ink can be constantly supplied to the printing plate, there is no ghost, but on the other hand, ink of high viscosity is used. There is a problem that cannot be done.

[0005]

By the way, in the conventionally known printing machine, since one inking unit is associated with the plate cylinder, the ink is always indispensable when the printing color is replaced. There is a problem in that the cleaning work is complicated and the printing machine cannot be operated efficiently.

In addition, a printing machine provided with a flexo type inking device is required for printing a printed material in which ghosts are likely to appear, while a multi-roller method is used for printing a printed material that requires the use of highly viscous ink. Since a printing machine provided with the inking device is required, it is necessary to prepare two types of printing machines in order to obtain a printed matter with high printing accuracy, which is economically problematic.

An object of the present invention is to provide a printing press that can be operated efficiently.

[0008]

In order to solve the above-mentioned problems, in the present invention, in a printing machine for supplying ink onto a plate surface of a plate cylinder and transferring the ink image to a printing object, the plate cylinder The first inking device and the second inking device are provided in association with each other.

Here, it is preferable that one of the first inking device and the second inking device be of a multi-roller system and the other be of a flexo system so that highly accurate printing can be performed according to the printed matter.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the printing unit 1 comprises an impression cylinder 2 and a plate cylinder 3. The plate cylinder 3 is provided with a first inking device 10 and a second inking device 20 in association with each other.

The first inking unit 10 has an inclined bottom plate 11
The ink on the outer circumference of the fountain roller 13 forming the ink fountain 12 is transferred to a plurality of kneading rollers 15 by a swingingly supported transfer roller 14, and the ink kneaded by the kneading rollers 15 is finally kneaded. To a multi-roller system that supplies the ink onto the plate surface of the plate cylinder 3 through two inking rollers 16a and 16b.

On the other hand, the second inking unit 20 supplies the ink to the ink chamber 22 formed in the ink receiving member 21, adheres the ink in the ink chamber 22 to the outer periphery of the anilox roller 23, and the anilox roller 23. This is a flexo method in which excess ink on the outer circumference of the plate is scraped off by a doctor (not shown), and the ink accumulated in the fine recesses formed on the outer circumference of the anilox roller 23 is supplied to the outer circumference of the plate cylinder 3.

One of the two inking rollers 16a, 16b of the first inking unit 10 is the inking roller 1
6a is swingably supported about the axis of the final kneading roller 15. The other inking roller 1
6b is swingably supported about the axis of the plate cylinder 3,
The final kneading roller 15 and the anilox roller 23 are switchably contacted.

By providing the first inking device 10 and the second inking device 20 in association with the plate cylinder 3 as described above, for example, printing in which ink is supplied from the first inking device 10 to the plate cylinder 3. At times, different color inks can be supplied to the ink chamber 22 of the second inking unit 20 to prepare for the conversion of the printing color.

After the printing is completed, one inking roller 16a is released from the plate cylinder 3, the other inking roller 16b is separated from the final kneading roller 15 to remove the remaining ink on the outer circumference, and the other inking roller is removed. The printing color can be exchanged by bringing 16b into contact with the anilox roller 23.

Since the exchange of the printing color is performed only by cleaning only the other inking roller 16b and switching the contact position, the time required for the exchange of the printing color is extremely short and the operating rate of the printing press can be improved. it can.

When printing a ghost-prone printed matter, the second inking device 20 is used to supply ink to the plate cylinder 3, and when printing a highly viscous ink, the first inking device 10 is used. Ink is supplied to the plate cylinder 3 using the ink.

In the embodiment, the printing unit 11 including the impression cylinder 2 and the plate cylinder 3 is shown, but the printing unit is not limited to this. For example, it may be composed of a plate cylinder, a blanket cylinder and an impression cylinder, or may be one in which two blanket cylinders are in contact with each other and the plate cylinder is in contact with each blanket cylinder.

[0020]

As described above, in the present invention, since two inking units are associated with the plate cylinder, when one inking unit is in operation, the other inking unit is charged with ink of a different color. Prepare to change the printing color.

Therefore, it is possible to exchange the printing color in an extremely short time, and the printing machine can be operated efficiently.

Further, by using a pair of two inking devices, one inking device being a multi-roller system and the other inking device being a flexo system, printed materials in which ghosts are likely to appear and inks having high ink viscosity are required. Can be printed accurately.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

[Explanation of symbols]

 3 plate cylinder 10 first inking device 12 ink fountain 13 fountain roller 14 transfer roller 15 kneading rollers 16a, 16b inking roller 20 second inking device 23 anilox roller

Claims (2)

[Claims] 1. A printing machine for supplying ink onto a plate surface of a plate cylinder and transferring the ink image to a printing medium, wherein the plate cylinder is provided with a first inking device and a second inking device in association with each other. Characteristic printing machine. 2. The first inking unit transfers the ink around the outer circumference of the fountain roller that comes into contact with the ink of the ink fountain and transfers the ink from the roller to a plurality of kneading rollers, and from the kneading roller to the plate surface via two inking rollers. It is a multi-roller system for supplying ink, and the second inking device is a flexo system for supplying the ink supplied in the depression on the outer periphery of the anilox roller to the plate surface. One of the two inking rollers in the first inking device is used. The final kneading roller is swingably supported about its axis, and the other inking roller can switchably contact the final kneading roller and the anilox roller while maintaining the contact state with the plate surface of the plate cylinder. The printing press according to claim 1, wherein the printing press is provided.