| 摘要 |
PROBLEM TO BE SOLVED: To perform alignment of a retainer collar and a punch driver with a simple structure and a high accuracy.SOLUTION: A first plane part 3c of a first annular part 3b of a retainer collar 3 and a second plane part 4d of a second annular part 4c of a punch driver are respectively formed in a direction orthogonal to an axial direction, and the first plane 3c and the second plane part 4d contact with each other in the axial direction. Further, in order to dispose the first annular part 3b of the retainer collar 3 and the second annular part 4c of the punch driver 4 in such a manner that by means of a ring member 7, both the annular parts are movable in the axial direction and are not movable in other directions, an axial center of the retainer collar 3 and an axial center of the punch driver 4 are aligned, and when the punch driver 4 and the a punch body 2 are integrally reciprocated in the axial direction in linkage with a punch head 5, an axial center of the first annular part 3b of the retainer colar 3 and an axial center of the second annular part 4c of the punch driver 4 are maintained in an aligned state. |
