High-speed bill printing press clutch pressure control based on complex programmable logic device (CPLD) and feedback method based on CPLD

Abstract

A high-speed bill printing press clutch pressure control based on a complex programmable logic device (CPLD) and a feedback method based on the CPLD. A CPLD embedded system digital circuit is adopted, clutch pressure action is controlled when a high-speed bill printing press prints in a high speed, timeliness feedback is performed when the mechanism actuates, a traditional programmable logic controller (PLC) and a clutch pressure function program part controlled by a site bus are taken over and replaced, instantaneous printing speed of the bill printing press can be calculated according to rotary encoder pulses, and a generated clutch pressure synchronous signal angle in this time is predicted according to delay average value dynamic of the clutch pressure mechanism. A clutch pressure solenoid valve is driven to act, and clutch pressure of a drum is accurately controlled. The principle of the high-speed bill printing press clutch pressure control based on the CPLD and the feedback method based on the CPLD is that the press clutch pressure control which is very high in instantaneity requirements is processed by the CPLD circuit with higher instantaneity, and a PLC is only responsible for processing feedback results; and the high-speed bill printing press clutch pressure control based on the CPLD and the feedback method based on the CPLD can greatly improve timeliness of the bill printing press to reduce and eradicate printed waste products which are caused by the clutch pressure time deviation problem because of a traditional inaccurate clutch pressure control method.

Description

technical field [0001] The invention relates to a clutch pressure control and feedback method of a high-speed banknote printing machine based on CPLD. Background technique [0002] At present, the electrical control system of banknote printing machines mostly adopts the distributed control system based on PLC control and field bus slave station. With the advancement of technology, when the banknote printing machine is increased to a production speed of more than 10,000 sheets per hour, the real-time requirements for the clutch and compaction of various color rollers are very high. The clutch pressure control method of sheet-fed printing is as follows: when the leading edge of the paper enters the position of the front gauge, the photoelectric sensor here obtains a photoelectric signal, which is compared with the synchronous signal of the banknote printing machine, and if it belongs to normal printing, it enters the clutch pressure In the program, the clutch pressure solenoi...

AI Technical Summary

Problems solved by technology

This method does not guarantee the complete avoidance of the clutch pressure problem, and the problem will occasionally occur when the machine status changes or the field bus is disturbed

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