[Abstract]: According to the working characteristics of the gravure printing machine, a novel control and implementation method of the automatic chromatographic printing machine control system is proposed, and multiple DSP subsystems and a host computer are connected through the CAN bus to realize the control system. . This control system introduces the efficient and reliable DSP chip TMS320lf 2407 as the printing register control chip. Compared with the traditional single-chip microcomputer control system, both in performance and reliability have improved a big step.
Therefore, the purpose of control is to keep the separation distance of the two color scales at 20 mm. The control amount is the difference between the detected distance value and 20mm.
1.1 Detection of overprint errors
The detection of overprinting errors is directly related to the accuracy of the overprinting. In order to make the detected overprinting errors as accurate as possible, this paper uses a photoelectric scanning head with double photoelectric eyes for error detection (see Figure 2). The photoelectric scanning head has 2 photoelectric eyes It is M1, the top is M2, the distance between them is 20mm, the direction of the printing material is from bottom to top, after scanning the color mark, each output two digital signals, after amplification and shaping, they are respectively connected to the TMS320lf2407 chip EVA module Capture pins CAP1 and CAP2; a photoelectric encoder is installed on the spindle synchronized with the plate roller shaft, and a pulse signal is generated when the spindle motor rotates, and its frequency is proportional to the speed of the spindle. This signal is sent to the TCLKINA port of the EVA module as a general purpose Timer 1 clock source. When the overprint is accurate, the output signal of M1 should lead the output signal of M2 by 20mm, that is, the second pulse signal output by M1 should arrive at the same time as the first pulse signal of M2.
1.2 Correction of overprint errors
After the DSP obtains the overprint error e, it calculates the correction amount of the compensation motor according to the digital fuzzy algorithm PID control algorithm to control the motor to make corresponding actions (the compensation motor here uses a stepper motor). The entire automatic register system is basically a closed-loop feedback system, see Figure 3.
2 Hardware system framework
The whole system (take six sets of color printing machine as an example) is composed of 5 DSP subsystems and an arm host computer with CAN interface to form a master-slave distributed system. The communication adopts CAN bus interface, and each DSP subsystem can independently complete the adjacent Two-color overprint. At the same time, the DSP keeps in touch with the host computer and transmits the data and status to the host computer. The host computer is externally connected with a monitor and keyboard, and displays the position of each color mark, overprint error, printing speed, printing length, etc. in real time by processing the data transmitted by the lower computer, so that the staff can timely understand the operation of the system and make corresponding operations. As shown in Figure 4, the host computer and DSP are driven by the uc5350 chip, and the CAN bus is used to transmit data. After the printing plate rotates once, all the color mark data is collected, and the 0-bit signal of the photoelectric encoder will trigger an external interrupt. At this time, the program starts to load the data to be transmitted and is ready to communicate with the host computer.
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