Device for wood chipping machine of disc type

Abstract From the Canadian patent

A wood chipping device including knife means and, associated guiding surfaces, wherein each guiding surface consists of a plurality of ridges extending side by side in a direction away from the knives and disposed so as to cause the chip slabs to slide across the knives to be broken up laterally into digester chips of substantially uniform size and that, substantially each ridge has a longitudinal direction forming an acute angle of at most about half a radian with the direction of travel of the chip slabs when sliding on the ridges.