Patent ID: 6955347

Claim:
A work pallet positioning and fixing device which is provided with a clamp mechanism for attracting and fixing a work pallet supporting a workpiece to be machined to a base body, and a positioning mechanism capable of positioning said work pallet with respect to said base body in each of horizontal and vertical directions, wherein said positioning mechanism comprises a receiving surface for defining a vertical position of said work pallet disposed on said base body, a sleeve shaft having an annular tapered surface for defining a horizontal position of said work pallet with respect to said base body, and an annular bush having an abutment surface for contacting with said receiving surface, which is disposed on said work pallet so as to be externally engagable with said sleeve shaft, and an inner periphery portion of said bush comprises an integrally formed engaging portion which is nearly annular and capable of elastically deforming in a diametrical direction, having an annular tapered surface at the inner periphery thereof, which is capable of externally fitting tight with said annular tapered surface, and an annular escape groove which allows an elastic deformation of said engaging portion is formed at an outer periphery side of said engaging portion of said bush.