| 摘要 |
1,217,301. Work handling means for presses. F. B. HATEBUR A.G. 7 Jan., 1969 [9 Jan., 1968], No. 1019/69. Heading B3H. A workpiece transfer device comprises a carriage 1 with grippers 4, 5 rotated by a drive including a pair of levers 30, 35 urged together by a spring 40 for joint movement and having co-operating abutments 45, 46 which release a rod 41 to operate a stop switch 43 when the levers are relatively moved. The grippers 4, 5 are inter-connected by gear segments 10, 11 and rotated by a crank 15 on one shaft 7 of one gripper. The crank is rigidly connected to a roller 17 between abutment surfaces 32, 38 of the levers 30, 35. The upper lever 30 is connected by a spring 29 and headed pin 28 to one arm 27 of a bell-crank 22. The lever 30 is pivoted about the same shaft 23 as the bell-crank. The lower lever 35 is pivoted to lugs 33, 34 on the upper lever. A pin 47 on the arm 27 serves to space the levers. The bell-crank is rotated by a cam 20 with a lobe 21 to open the grippers. In normal operation the movement of the arm 27 of the bell-crank serves to move both levers and hence the roller 17 causing the crank 15 to rotate and the grippers to open. However, if either of the levers is restrained by the roller against its abutment surface, for example, when the grippers jam, then the levers are moved relatively by the arm 27 to release the rod 41 and actuate the switch 43 to stop the press and/or the transfer. The rod release mechanism may be replaced by a proximity switch fixed to either lever. Also the roller 17 may be mounted directly on the crank 15. |
