Patent ID: 7581472

Claim:
A tool holder positioning device which includes: a plurality of protruded portions or a plurality of recessed portions formed to a seating surface of a tool rest; and a plurality of recessed portions or a plurality of protruded portions formed to a coupling surface of a tool holder so as to correspond, respectively, to a plurality of protruded portions or a plurality of recessed portions formed to the seating surface of the tool rest, when the seating surface and the coupling surface are contacted, and in which the protruded portions and the recessed portions have tapered surfaces which are symmetric with each other so as to slidably contact to each other when the seating surface and the coupling surface are tightly contacted, wherein at least one of the protruded portions and at least one of the recessed portions are disposed on an intersecting axis included in the seating surface, the recessed portions and the protruded portions to be fitted to the plurality of protruded portions and the plurality of recessed portions are disposed on an intersecting axis included in the coupling surface, a plurality of slots parallel with the seating surface or coupling surface are alternatively formed in a direction of an axis on which the protruded portions are disposed so that the protruded portions are elastically deformable in a vertical direction with respect to the seating surface or coupling surface, and the tapered surfaces of the recessed portions and the protruded portions are symmetric with respect to the axes on which the respective recessed portions and the protruded portions are disposed.