Control method of variable feeding cycle based on servo control
                                                          BI Yangji, XIA Congcong, WU Xiaoming
                             (Guangdong Dongfang Precision Science & Technology Co.,Ltd., Foshan 528225, China)

Abstract: Aiming at the problem of decline in printing efficiency and reduction in printing quality caused by using fixed feeding cycle of carton digital printing machine, the influence of the fixed feeding cycle mode on the printing efficiency and quality was studied，and the variable feeding cycle control strategy was summarized. An improved method based on servo control for variable feeding cycle to realize short distance transmission of cardboard was proposed. Firstly, a highprecision mechanical cam for short distance transmission was optimized. Then, the coordinate parameters of the motion curve were calculated according to the cam parameters, the distance parameters and the movement rules of each movement axis. Finally, the optimal electronic cam curve for each motion axis was designed. The feasibility and practicability of the improved method were verified through the experimental platform test. The results indicate that different paperboards correspond to different feed cycles and the spacing is the same. The control method can improve the quality of inkjet printing, realize the short distance transmission of cardboard, and enhance the production efficiency of digital printing.

Key words: variable feeding cycle; mechanical cam; servo motion control; virtual master; electrical cam