... includes seven parts such as driving medium,rack,the jaw plate and side rack ,flywheel,lubrication device,adjusting device ... belt pulley, flywheel, movable jaw plate, wrist plate ,adjustable gap screw, offsetting spring, fixed jaw plate. The wrist plate also has the effect of ... includes seven parts such as driving medium,rack,the jaw plate and side rack ,flywheel,lubrication device,adjusting device ...