Patent ID: 7926400

Claim:
A rotary cutter for pelletization of plastic extrudates, said rotary cutter being provided with hook-shaped knives projecting axially beyond an end surface thereof, said knives being individually affixed to supporting surfaces of the rotary cutter by means of fastening elements, wherein the rotary cutter has a circular peripheral surface, wherein each of the hook-shaped knives is a single monolithic member which includes an L-shaped portion formed by a portion with a knife edge and a projecting portion extending in a direction that is substantially orthogonal to the portion with the knife edge, the projecting portion having a length and a flat bottom surface which are substantially orthogonal to each other so that the knife edge extends in a direction parallel to the length of the projecting portion and substantially orthogonal to the flat bottom surface of the projecting portion, wherein the projecting portions of the knives are inserted, respectively, into radial grooves formed on a peripheral surface of the rotary cutter, and the knife edges extend in a direction parallel to the end surface of the rotary cutter, wherein each of the radial grooves includes two side walls which form said supporting surfaces on opposite sides of the groove, and the grooves being closed, respectively, at each end thereof by a pair of radial transverse walls, the two side walls and a first one of transverse walls of each groove substantially correspond to an outer shape of the projecting portion inserted therein, and wherein a second one of the radial transverse walls of each groove forms a counter support for the corresponding fastening element, and the first one of the radial transverse walls of each groove forms a counter support for the corresponding projecting portion inserted into the groove.