The "Printing Machinery Structure and Principles" course is one of the core courses of the printing profession. It is very important to master the course to master the printing professional skills. If the professional teacher goes deep into the production site of the printing enterprise during the internship, the on-site explanation and demonstration operation in the student's work process can achieve the teaching effect with half the effort and make up for the lack of teaching in the classroom. The author combines practical teaching, put forward some ideas, and discuss with everyone. 1. Transmission part of printing machinery Start with the power source, and then find other working parts, such as paper feeding mechanism, front and side gauge mechanism, transfer mechanism, inking and wetting mechanism, roller clutch mechanism, delivery mechanism, etc. How the various mechanisms of the machine are driven. Among these transmission relationships, there are belt drive, gear drive, connecting rod drive, eccentric drive, cam drive, worm gear drive, ratchet ratchet drive, etc., each part can be seen clearly. Some gravure presses, flexo presses, and screen printers can see most of the transmission relationship when the wall panel is not removed, as long as the teachers and students can communicate with each other. In this way, the students have a clear understanding of the overall transmission relationship of the printing machinery. 2, printing machinery paper feeding part The transmission relationship of the paper feeding part of the printing machine Most machines can be seen clearly with only a few wall panels or no wall panels. In the classroom, students have difficulty understanding the contents, such as the structure and working principle of the clutch, the structure and working principle of the paper feeding nozzle, the structure and working principle of the automatic paper raising mechanism, the air pump and pneumatic control system, the paper detection and automatic control system. Etc. Some can be explained on the machine, some can be dispelled, let students master the essentials of their operations, and help students improve their ability to analyze and solve problems. 3, printing machinery rules section The rules are often used in printing machinery operations. The structure and principle are explained in the classroom. But the adjustment of some functional components is very important, such as the photoelectric detection device and the pre-positioning plate. The height, the front and rear adjustment, the adjustment of the front specified time, the adjustment of the side position plate, the adjustment of the roller pressure during paper feeding, the adjustment of the side positioning time, the adjustment of the paper delivery time by the rule member and the transfer mechanism, etc. Professional teachers who explain or demonstrate the work of students are very important to help students improve their printing machinery skills. Article source address: http:// Fire Resistant Foam Mattress,Fire Retardant Memory Foam Mattress,Fire Retardant Hybrid Mattress,Fire Resistant Mattress HESHAN HAIMA FURNITURE CO., LTD , https://www.springmattress.com