| 摘要 |
1,030,381. Extruding; metal working presses. MINSTER MACHINE CO. Feb. 14, 1964 [Nov. 26, 1963] No. 6307/64. Headings B3H and B3P. A press, particularly for forming can bodies by impact extrusion has two or more slides 18, 20 actuated by a crank-shaft 32 whose crankpins 32, 34 are displaced angularly from each other, whereby the slides reach the ends of their working strokes in succession. The crankpins are displaced by 8-10 degrees and the crank-shaft is driven by a motor 38 through clutch 40 and brake 42. Each slide has an anvil 64 adapted to engage the heads 62 of a pair of punches, 44 mounted in a rotary turret 46 which carries eight punches Fig. 3 (not shown), whereby four cans are extruded for each revolution of the crank-shaft whilst four previously extruded cans 79, Fig. 4 (not shown), are stripped from the other punches and discharged into shoots 70. Surrounding each punch is a stripper ring 56 carrying rollers 76 running in a stationary cam track 74 which both effects the stripping operation and returns the punches to their upper positions. Spring-biased portions 80 of the track are yieldable at the extrusion stations to permit the punches 44 to backwardly extrude blanks 92 within die recesses 68. The blanks are fed from a magazine 90, Fig. 5 (not shown), by a reciprocating slide 96 actuated through lever 98, cam groove 102, gearing 106, 108 and Geneva mechanism 110, 112 driven from the crank-shaft. Turret 46, Fig. 1, is indexed through 90 degrees between press strokes by mechanism 50 driven through shaft 52 and gearing 54 from the crank-shaft. Slides 18, 20 are secured to their connecting rods 22, 24 by adjustable eccentric pins 120, Fig. 8 (not shown ), which are rotatable by individual motors 124 for adjusting the end positions of the punches and hence the thickness of the can bottoms. This adjustment may be made manually or automatically by actuation of a feeler contact 126, Fig. 9 (not shown), operating a relay controller timer. The adjustment may also be effected in dependence upon the load on the connecting rods. Instead of a rotary turret 46, a reciprocating type of indexing mechanism may be used. |
