| 摘要 |
<p>A press working die assembly includes a pad (2) secured to an upper die holder so as to be movable upward and downward, a machining slide cam (3) slidable laterally along a cam surface (3a) and having a bending edge (3b) at one end thereof, a rotatable rotary cam (4) having a bending portion (4a) for forming a negative angle portion of a work, and a reciprocal driving apparatus (6) configured to rotate the rotary cam (4) to a work machining position, and the reciprocal driving apparatus (6) includes a slide block (7) having a cam surface (7a) for rotating the rotary cam (4) in a predetermined direction on an front end side and a rotation impelling surface (7b) configured to rotate the rotary cam back (4) to its original position, and a restoring action block (9) configured to come into abutment with the rotation impelling surface (7b) of the slide block (7) when the slide block retracts to restore the rotary cam to its original position.</p> |
