A digital and precise ink supply method for a printing machine

Abstract

The invention discloses a digitized accurate ink supply method of a printing machine. Metering printing ink conveying units replace ink keys on a traditional printing machine; each metering printing ink conveying unit directly conveys printing ink to corresponding ink areas; and the volume or mass serves as metering basis, quantitative supply of the printing ink for each ink area is achieved. In the working state, the ink supply flow speed of each metering printing ink conveying unit is obtained through calculation according to the consumption amount of the printing ink of corresponding color plates and the corresponding ink areas in each printed sheet and the operation speed of the printing machine, and the ink supply flow speed of each metering printing ink conveying unit is calculated and adjusted in real time along with change of the operation speed of the printing machine. By means of the digitized accurate ink supply method of the printing machine, real-time accurate adjustment can be achieved, the automation degree and digitization degree are high, the adjustable range is wide, one-way printing ink conveying is achieved, and printing ink return is avoided.

Description

Technical field [0001] The invention belongs to the technical fields of printing technology, printing process, machinery, electronic control, digital calculation, etc., and specifically relates to a digital precise ink supply method for a printing machine. Background technique [0002] At present, the ink printer is equipped with a mechanical ink key ink fountain as the ink supply device for the single color group of the printer. The control method of the ink fountain on the ink key can be electronically controlled (driven by a motor) or manual (using a screw, etc.). Usually, after color separation, a printed pattern is formed into 4 colors or more colors, and the color plates are respectively made and reproduced into color prints after being superimposed on the printing machine. Each color group of the printing press completes a single-color printing job. The printing format of each color group is uniformly divided into several ink areas. Each color group is equipped with an i...

AI Technical Summary

Problems solved by technology

[0003] Since the ink key is a mechanical product, 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 accurately control the opening and closing degree; The consistency between them is weak; absolute accuracy and relative accuracy cannot be guaranteed; in addition to ink fountains and ink keys, traditional printing press ink supply methods and mechanisms also use other mechanical contact and mechanical control methods to transfer ink, specifically The ink transfer roller that works in a oscillating manner, the speed of the ink fountain roller, the contact time between the ink rollers and the control accuracy of the action, these mechanisms and working principles make the calculation, adjustment and control of the actual ink supply more difficult and cannot be accurately quantified

To deal with these problems, a variety of technologies are used 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 control of

[0004] For these reasons, the ink supply system of traditional printing presses works in an "analogue" and qualitative method. It can only be judged that the ink supply is "more" or "less" by detecting the printed matter, and it is impossible to know the actual amount of ink supplied.

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