The servo motor is also known as the executive motor. In an automatic control system, it is used as an execution element to convert the received electrical signal into an angular displacement or angular speed output on the motor shaft. Servo control is a general term for controlling the precise positioning, speed and other motor elements of machine equipment. The servo control system is mainly composed of the controller and the servo transmission unit, which is transmitted to the load end through the mechanical parts. Servo system (or servo product) usually includes servo driver (instruction device), servo motor, and servo feedback device (encoder). Good rapid corresponding ability, large torque, small inertia of rotation, small time constant. With the driver and controller (such as servo motor, stepping motor), good control performance. Printing industry: laser typesetting, proofing equipment, automatic plate punching machine, drying machine; printing machine, offset printing machine, rotary printing machine; folding machine, binding machine, paper cutting machine, line locking machine; automatic tile fern board (box) production line.