| 摘要 |
479,675. Making casings for springs. PERCIVAL. S. (Jacobs Co., F. L.) Sept,. 13, 1937, No. 24875. [Classes 83 (ii) and 83 (iv)] Punching ; stamping ; sheet-metal feeds.-A machine for punching and embossing a sheet to be formed into a cover for automobile springs comprises a punching head and an embossing head with a gravity feed for the sheet between the stations. Power shafts 36, 50 driven through a one revolution clutch from a pulley carrying eccentrics 56, coupled by adjustable rods 90 to an embossing head 8 and a punching head 10. The embossing head carries two sets of dies 204, 196 adjustable by bolts 202, 166 in the framing and a clamping ring 190 mounted on rubber buffers 184. The punching head carries four double punches 274, 276 co-operating with dies 247, 249. The punches are adjustably secured by T bolts 267 and the dies are mutually adjustable by right and left handed screws 324. Strippers 278 are fitted. A punch 253 co-operates with a die 251 to form short attached straps S in the blank. Feed. A surface 28 slopes downwards from the receiving end. The blank is positioned by hand against a stop-pin 314 and pins 306 at the embossing station. After this operation a cam on the shaft 50 raises a bar 352 to lift the blank clear of the pins 306. It slides down the surface to a first punching station against pins 318 and a cam-actuated bar 338 with resilient end 342 pushes the blank against an end stop pin 316. The first punching operation then takes place and bars 368 raise the blank clear of the pins to allow it to 'slide by gravity to be positioned for the second punching operation by a pin 302, pins 320 and a cam-actuated bar 340. After this operation cam-actuated bars 390 lift the blank clear of the pins and it slides to a delivery conveyer. Operation. The flat blank 391 is positioned by hand at the embossing station E. Fig. 13, and, on depression of a pedal the one revolution clutch operates and the formations F, Fig. 28, are stamped to form housings for the spring clips by the dies 204, 196. The blank then slides to the first punching station P<1> and on depression of the pedal slots S<1> extending front a line BB to beyond the centre line AA are punched by the punches 274 and the straps S are formed by the punches 253. The blank then slides to the second punching station P<2>, the pedal is depressed and slots S<2> extending from the line CC to beyond the line AA are punched to form continuous slots S together with the straps S<3>. A camactuated reciprocating cutter 282 shears the edges of the blank. The waste portion between the pin 302 and the shear is expelled by compressed air from a pipe 394 controlled by a cam-actuated valve.
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