Patent ID: 7237739

Claim:
A grinding machine, comprising: a housing having a receiving element which receives material; at least one shaft which is axially mounted in the housing; a plurality of grinding tools connected to the at least one shaft in an angular position in an axial direction of the least one shaft, each grinding tool having a first transverse cutter, an inner cutting region and an outer cutting region such that the inner cutting region is configured to receive from the receiving element a first amount of material and the outer cutting region is configured to receive from the receiving element a second amount of material, the inner cutting region having a shorter lever arm than the outer cutting region; and a plurality of rigid cutting tools arranged within the housing in a fixed position on opposing sides of the least one shaft, each rigid cutting tool having teeth arranged in a saw-like manner providing flanks at an angle to each other, and a second transverse cutter wherein the at least one shaft rotates the plurality of grinding tools such that the inner cutting region of a grinding tool grinds the amount of material against one tooth of the corresponding rigid cutting tool, while the outer cutting region of said grinding tool grinds the other amount of material against one further tooth of the rigid cutting tool and the first transverse cutter orientates in an offset parallel position toward the second transverse cutter to grind material between the first transverse cutter and the second transverse cutter.