6 upper sets and 4 lower sets of power wheels adopted for this machine for feeding, driven by worm gear speed reducer,and actuated by universal joint,typical of vigorous and synchronous feeding ,which is more unobstructed.Pressure of upper feeding wheel controlled by pressure air cylinder, able to viewhardness of wood ,for free adjustment.Economical and safe feeding in the type of feeding wheel, able for control and maintenance;Large scope of pressure thickness in air pressure type,reachable to 35mm in maximum.