Available speeds 200m/min stacking height: 1700mm patented speed-switching technique for clean load and order separation reliable high-speed instant order change exact sheet count automatic vacuum at infeed conveyors based on speed energy-absorbing, vibrating backstop single, double and triple wallboards are available. Stacking unit controlled by computer system. Computerized control system, it can accepted order change quickly for each lot of sheet counting accurate. The stacking speed upon the speed of belt drive unit to proportion adjustable automatically. Speeds of conveyor changeable by arch. Motor for taking apart the different sizes of order easily.