| 摘要 |
1,103,599. Forging presses. SAMUEL GRIFFITHS (WILLENHALL) Ltd. 20 June, 1965 [31 Oct., 1964], No. 44493/64. Heading B3H. [Also in Division B5] A power press includes a base 11, a pedestal 12 pivotably adjustable on the pedestal, a lower die 18, and a reciprocable upper die 21 connected by a ball joint 25 and connecting-rod 24 to the crank 23 of a crank-shaft 22, the crank-shaft being driven from a motor 28 through an epicyclic transmission which is arranged to brake the crank-shaft after each working stroke. The pedestal 12 is adjustable by a screw 14 to pivot about a horizontal axis relative to the base, a locking nut 13 movable in an arcuate slot 12a clamping the pedestal in position. The transmission (Fig. 2) includes a pulley driven planet carrier 33 which serves as a flywheel and supports three shafts 45 in bearings 46 and 47. Each shaft carries planet gears 43 and 44 keyed to the shaft by synthetic resin 50 injected into the shaft and allowed to harden. The planet gear 43 is keyed to a sleeve 55 which is keyed to the crank-shaft 22. The planet gear 44 is keyed to a sleeve 59 to which is attached a hub 64 carrying internally splined annular plates 66 supporting brake linings 67. A similar annular plate 76 with linings 77 is splined to a hub 74 keyed to the end of the crank-shaft. Following a working stroke, the crank-shaft is braked by springs 88 situated in the end wall 70 of the press and urging a piston 87 towards a fixed wall 78. To release the brake the piston 87 is urged to the left of its cylinder 80 by introducing a fluid such as air into the annular chamber 82 between the piston and cylinder. This movement causes thrust members 90 to compress the brake linings 67 between externally splined plates 73 and a fixed wall 71 to brake the hub 64 and hence the planet gears 44. The rotation of the planet carrier 34 is thus transmitted through the planet gears 43 to the crank-shaft. Release of pressure in the chamber 82 will allow the springs 88 to re-apply the brake for the crank-shaft. |
