Position sensor-free folder servo electric control knife device

The invention provides a position sensor-free folder servo electric control knife device, which is used for folding paper after a paper position signal of a paper signal transmitter is received. The position sensor-free folder servo electric control knife device comprises a main control panel, a pulse generator, a servo driver and a servo motor; a sensor is not required to be mounted at the highest position of an electric control knife; by virtue of an own speed encoder of the servo motor, a pulse signal can be automatically sent at a Z position to enable a system to predict the knife head position of the electric control knife; in a pulse counting way, accurate positioning of the electric control knife is achieved; due to prediction of the knife head position of the electric control knife by the system, when the knife head of the electric control knife is about to arrive at the highest position, the servo motor reduces the speed and no impact on a machine exists, so that the service life of a mechanical comp