Patent ID: 7434756

Claim:
A rotor and counter knife for a rotary grinder combination, comprising: a rotor having a longitudinal axis and a plurality of sets of tool holders machined from and extending radially from a circumferential surface of said rotor, said plurality of sets of tool holders formed integrally with said rotor, each of said plurality of sets of tool holders having at least two axially aligned tool holders extending parallel to said longitudinal axis along said circumferential surface of said rotor, wherein a first set of said plurality of sets of tool holders has a first angular length and wherein an adjacent second set of said plurality of sets of tool holders has the same said first angular length and further wherein said second set is offset from said first set by a second angular length which is less than or equal to said first angular length, each of said tool holders having a cutter thereon, each of said cutters having a cutting edge extending from said rotor, said counter knife having a continuous knife cutting edge which becomes substantially adjacent at least one cutting edge of a cutter within a rotation of said rotor, wherein at least said cutters of one of said sets of plurality of said tool holders are overlapping an adjacent one of said sets of said plurality of said tool holders along a direction parallel to said longitudinal axis.