| 摘要 |
<p>The machine includes two turrets (6, 7) carrying a plurality of punch-die pairs (8, 9), a magazine (31) for these pairs, and a device (32) for changing over the pairs. This device (32) is formed from at least one changeover arm (48, 49) having two gripper elements (53, 54), each comprising a pair of jaws (131) operable by a common actuator (142, 143). The two jaws (131) are provided with a through-pin (138) and are each engagable in a pair of channels (136, 137), perpendicular to each other, carried by a flange (89, 90) of the punch (8) or the die (9). When the gripper element (53, 54) moves parallel to the axis of the punch (8) or the die (9), a first channel (136) of the pair is disposed axially and has a quadrangular section, while the other channel (137) is tangential and has a triangular section. <IMAGE></p> |
