Conveyor chain blocks and guide rails of high quality special materials, auto lubri-cation, high precision and long service life. Electrical lifting feed table, for frequently adjusting the height, reduce labour intensity and improve efficiency. Variable (frequency converter controls) feeding speed, much more suitable for processing various wood. Patented unique splitting cutter prevents saw blade seizing during process. Patented tooth design on side of conveyor chain block, cut off the wood pieces jammed beside saw blade, minimizing probability of blade stuck. Helps avoid injuries. It is much safer than upper ripsaw due to saw shaft rotating in different direction.