| 摘要 |
492,925. Maldng paperfasteners. TRUSSELL MANUFACTURING CO. Sept. 17, 1937, No. 25337. Convention date, Dec. 12, 1936. [Classes 83 (ii) and 83 (iv)] A zigzag wire, Fig. 1, is intermittently fed through dies which bend the wire to tubular shape and severs it to form book-binding elements. Feeding. The zigzag wire is fed by toothed rolls 18, 20 engaging the top of the wire and by toothed spring-pressed feed bars 24 engaging the bottom. The reciprocation of a press head 16, through adjustable plates 60, oscillates a bell-crank 62 engaging lugs on a feed slide 28 to actuate feed roll ratchets 68, 71 and a bar 75 engaging the feed bars. A plate 34 toothed on the underside is pressed upon the strip by a spring 36. A spring- mounted plunger 80 applies pressure to the plate 34 on the downstroke of the press. Bending. The strip is fed over a die with four steps co-operating with four surfaces 47, 48, 49, 50 on the reciprocating die 12 to bend the strip through stages 51, 52, 53 to the finished form 55 with a cusp. Each die is of the final curvature and bends the strip in stages from the edges inwards. Shearing. The strip is severed by a cutter 82 reciprocated through and co-operating with an opening 83 in a supporting bar 14. A chain 87 driven from the feed roll 20 carries a roller 92 which periodically lowers a gag 93 into the path of a slide 97 reciprocated by a roller 100 on the die head to actuate the cutter. Specifications 422,409, [Group XV], 466,513, and 466,809 are referred to. |
