Ink supply device for offset press and ink supply control method

Abstract

The invention discloses an ink supply device for an offset press and an ink supply control method. The ink supply device comprises an ink foundation roller and digital ink foundations. The ink foundation roller is driven by an ink foundation roller motor; the digital ink foundations are mounted above the ink foundation roller and are arranged along the axial direction of the ink foundation roller,and each of the digital ink foundations corresponds to eight ink regions on a breadth surface; each of the digital ink foundations comprises an ink supply pump, eight electromagnetic reversing valves, eight ink-spraying heads and a controller; the ink supply pump is driven by an ink pump motor and is provided with an ink inlet hole and eight ink outlet holes; the ink inlet holes of the eight electromagnetic reversing valves are connected to the eight ink outlet holes of the ink supply pump in a one to one correspondence manner; each of the electromagnetic reversing valves is driven by a pneumatic switch, separately; the eight ink-spraying heads are connected to the ink outlet holes of the eight electromagnetic reversing valves in a one to one correspondence manner and are close to the surface of the ink foundation roller; and the controller is in signal connection to the eight electromagnetic reversing valves. The ink supply device and the ink supply control method disclosed by the invention can achieve precise zone control of ink amounts of color cells of a printer.

Description

technical field [0001] The invention relates to an ink supply device and an ink supply control method of an offset printing machine. Background technique [0002] Printed matter should be able to truly describe a variety of colors and an ever-changing world. The color performance of printed matter is directly related to the ink supply of the printing machine. If you want to achieve detailed color expression, you need to accurately control the ink supply of the printing machine. In addition, most modern printing jobs are short-run jobs, and the ink supply in the printing process is quite different when a pair of printing plates prints thousands or even one or two hundred sheets at a time. Every time the printing plate is replaced, the ink volume must be readjusted. Supply, which requires the ink supply process to be adjusted to the best working condition in the shortest possible time, so that the printed matter can achieve the best color effect. [0003] At present, the ink...

AI Technical Summary

Problems solved by technology

[0004] Since the ink key is a mechanical component, the actual adjustment size range of the opening is very small (the commonly used range is 0-0.2 mm), which makes it difficult to calibrate the zero position and precisely control the opening and closing degree: each ink key on the same ink fountain The consistency between them is weak; neither absolute accuracy nor relative accuracy can be guaranteed; except ink fountain and ink key

Other mechanical contact and mechanical control methods are used to transfer ink in traditional ink supply methods and mechanisms. Specifically, ink transfer rollers that work in a swinging manner, ink fountain roller speed, contact time between ink rollers, and action control Accuracy, these mechanisms and working principles make the calculation, adjustment and control of the actual ink supply more difficult and cannot be accurately quantified

In response to these problems, a variety of technologies have been adopted in the printing process. Specifically, the ink discharge curve of each ink fountain is set to approximate the corresponding relationship between the ink supply volume and the opening and closing value, but none of them can essentially realize the ink supply. precise quantitative control

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