CN2537640Y Automatic bag making machine heat sealing knife servo device consists of bracket, traction roller, cutting roller, heat sealing knife and controller. The main technical feature is that the heat-sealing cutter is installed on the rotating shaft, the rotating shaft is provided with a gear, the gear meshes with the gear on the main motor main shaft arranged on the frame, the main motor is provided with a roller movement sensor, and the heat-sealing cutter The cutter position sensor is provided on the rotary shaft. The structure design of the heat seal cutter servo device is scientific and reasonable, greatly reducing the overall volume of the bag making machine, and due to the continuous motion of the traction roller, there is no influence of the force distance, and the intelligent controller can accurately control the film. Set the length.