Patent GB-105231-A (GB)
Title: Improvements in Machines for Making Snap Fasteners.
IPC: B21D53/48
Filed: 1917-03-26
Abstract: 105,231. American Fasteaer Co., (Assignees of Kiessling, M. F.). March 17, 1916, [Convention date]. Fastenings; springs.-A machine for making the female members of snap-fastenings or pressbuttons comprises means for cupping the fasteners from strip stock, a loop return guide for reversing the strip prior to blanking out the cupped fasteners, and a dial plate for transferring the fasteners to spring inserting, beading, and ejecting stations. The springs are made in the machine from wire-stock. All the parts of the machine, except the slitting-saws, are driven from the crank-shaft 4 that erciprocates the press heads 18, 59. The various motions are derived from the cam shafts driven by the bevel-gearing shown in Figs. 1 and 2. A worm 120, Fig. 2, actuates a ratchet drive for feed-rolls 35 which draw strip stock beneath cupping-punches 22, 23, 24 to form the sockets 29, Fig. 7, a gang punch 30 which forms the sewing-holes 34, and n planishing-punch 31. The slots at the base of the sockets to receive the legs of the springs are formed by a pair of slitting-saws driven at 121. The strip then passes through a loop return guide 42 formed on the table 39, and is fed as regulated by a reciprocating pawl 44 to a cutting-out and cupping punch 53. The stepped die 52, Fig. 11, is carried by a bridge-piece 51 spanning an annular dial plate 40, Fig. 13, having a series of apertures. The punch 53 just cuts out a circular blank, and the punch 54, hollow to admit the socket 29 and actuated by the separate head 59, then cups the blank and forces it into a recess in the dial which is a frictional fit for the blank and acts as stripper for the punch. The scrap stock is stripped from the punch 53 by a hold-down (not shown). The pawl 60 for indexing the dial is mounted on a reciprocating bar and carries a cam 65 for retracting the spring-controlled locking- bolt 64. Spring wire is fed through a guide 88, Fig. 16, having a cutting-edge co.acting with the corner 75 of one of the bending-dies which are carried by oppositely-moving slides 71, 86. A concave die 85 bends the wire round a mandrel 69 projected by a cam-lever and slide 70' through a stripping-plate 94 and carrier slide 90, Fig. 27. Levers 72 then close the wire laterally round the former, and the slide 86 advances the die 87 to form the reverse bends. The dies then retire, and the former is withdrawn, leaving the spring seated in a recess in the carrier slide 90, which is then advanced to bring the blank below a punch 101 situated over the second aperture of the dial. The carrier slide contains an auxiliary slide actuated during passage by a fixed cam or lug to set the spring. The punch 101 is recessed at 103, Fig. 35, to receive the socket 29, and is bevelled at 104 to engage and spread the legs of the spring, forcing them over the socket to snap into the slots 38 and transferring the spring from the carrier into the cupped blank. The third aperture of the dial is located over a punch 108 and beneath a die 110 fitted with an ejector 112. The punch 108 and ejector 112 are connected to levers 114, Fig. 2, actuated successively by a common cam. The punch forces the blank up into the die, beading the edge to retain the spring, as shown in Fig. 7, thus completing the fastener. The ejector returns the fastener to the dial for transfer to the final station projection. Specifications 29587/06 and 29588/06 are referred to.