Offset printing machine with two printing plates alternate printing with independent ink system

Abstract

The invention discloses a double-printing-plate alternative printing lithography machine with an independent water and ink painting system. The double-printing-plate alternative printing lithography machine comprises a machine table, at least one printing unit is installed on the machine table, and each printing unit comprises an impression cylinder, two plate cylinders and a blanket cylinder, wherein the two plate cylinders are provided with a water supply system and an ink supply system respectively, the blanket cylinder has three locating points, the first locating point is characterized in that the blanket cylinder is located in the middle and is not in contact with the two plate cylinders, the second locating point is characterized in that the blanket cylinder is in contact with one plate cylinder, the third locating point is characterized in that the blanket cylinder is in contact with the other plate cylinder, and when the double-printing-plate alternative printing lithography machine works, the blanket cylinder is respectively in alternative contact with the two plate cylinders. Under the condition that the double-printing-plate alternative printing lithography machine is not stopped, work of plate exchanging, ink exchanging and the like is completed, the operation stopping time caused by plate replacing is accordingly saved in the printing process, the printing efficiency is greatly improved, and quite considerable earnings are achieved.

Description

technical field [0001] The invention relates to a flat printing machine. Background technique [0002] The lithographic printing machine in the prior art mainly is made of 3 main cylinders, is commonly called as three major cylinders, namely printing plate cylinder, rubber cylinder and impression cylinder. The printing plate cylinder is installed with the printing plate, the rubber cylinder is installed with the blanket, and the impression cylinder supports paper and other substrates. During printing, the three cylinders are pressed together, closely contacted and rotated in turn, and the ink used for printing reaches the printing plate on the printing plate cylinder. Under the protection of water, the graphic part of the printing plate absorbs the ink to form an ink image. The ink image on the plate is transferred to the blanket on the blanket cylinder, and then transferred to the paper on the impression cylinder through the blanket, so as to print the required graphics on...

AI Technical Summary

Problems solved by technology

The two plate cylinders of the printing machine disclosed in the above-mentioned patent documents only share a set of water supply and ink supply system. The system needs to change the ink, so the printing process still needs to be stopped at this time to change the ink, which still causes the whole machine to stop and wait. Ink color changes often occur during the actual operation of the printing machine. This solution cannot fundamentally Solve the problem of printing efficiency

[0010] 2. The ink supply system of the offset printing machine is a long ink path for ink supply. From the ink fountain roller to the ink form roller, there are dozens of large and small ink rollers such as ink transfer rollers, ink distribution rollers, string ink rollers, and heavy rollers. A complex and huge system, so that the ink can be evenly mixed to meet the requirements of offset printing. Assuming that two sets of independent water supply and ink supply systems are installed in the printing press disclosed in the above patent document, the problem of improving printing efficiency can be solved theoretically. However, after each plate cylinder is equipped with a corresponding independent water supply and ink supply system, it is a huge and cumbersome system, which is not convenient for large and precise movements, and is difficult to achieve in actual production.

[0011] 3. Practice has proved that the three major cylinders (plate cylinder, rubber cylinder and impression cylinder) cannot be arranged vertically or horizontally in a straight line, because such an arrangement will bring a series of problems to the use and maintenance of the printing press. question

The three cylinders of the printing machine disclosed in the above patent documents are arranged in a straight line, which will bring a series of problems to the use and maintenance of the printing machine

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