Patent GB-631384-A (GB)
Title: Improvements in and relating to the manufacture of sliders for sliding clasp fasteners
IPC: B21D53/50
Filed: 1946-11-29
Abstract: 631,384. Making fastenings; embossing. HUGHES, C. L. (Pilling Chain Co.). Nov. 29, 1946, No. 35481. [Classes 83 (ii) and 83 (iv)] Apparatus for embossing a reinforcing V in the neck of a claspfastener slider comprises a pair of rotary feed screws 17, Fig. 1, transferring sliders from a shoot 34 to a stamp 70 where each slider in turn is depressed on to a ma,ndrel, and stamped while laterally supported by pointed jaws; and further screws 127 for transferring the finished sliders to an exit shoot 146. Blanks transferring.-The sliders fall from the shoot 34, Fig. 4, wide part uppermost and bail forward, and fit the space 45 between the flutes 18 of synchronously geardriven screws 17 and are traversed along a central ramp 54 and horizontal guide 53. In the exit feed the stamped sliders travel along a horizontal guide 149, Fig. 12, between similar screw spaces 144 and fall clear of the recessed ends 145. Gauging-stops.-The faces of the feed screws define the stamping space in conjunction with die plates 55 carried by the guides 53, 149 adjustable by micrometers 59, 155 and locked by screws 56, 57, 152, 143. A fixed. mandrel 64 enters the slider at its lowest position and forms a further supporting gauge stop carried by the base-plate in a screw-adjusted holder 63. Press actuating mechanism.-The stamping punch 111, Fig. 10, carried by a holder 108 is reciprocated through a pitman 112 from a crank 81 driven through a gear 9, Fig. 1, and has twice the stroke of the holder guides 109 of a yoked frame 83 reciprocated by a pitman 86 from a further eccentric of the same crank (Fig. 11, not shown). Work-holders.-The frame 83 has in nest plates 96 lateral passages supporting pointed jaws 94 crank connected at 98 to the fixed frame and on reciprocation of the frame 83 the jaws converge to control the deformation of the neck during stamping of the V (Figs. 19A to 20B, not shown). The work-holder stroke is screw adjustable by shifting the pivot blocks 99A. Stroke adjustments.-The punch stroke is set by means of the pitman collars 88, 116 and look-nuts 91, 117. Stop and relief mechanism.-If the slider is not in contact with the guide 53 it strikes a sector plate 47, Fig. 4, which pivots and operates a micro-switch controlling the driving motor. A horizontal pin 65 in contact with the mandrel 64 operates a further micro switch through a pivoted sector 66 to stop the machine on bending or breaking of the mandrel 64. Two angularly mounted pins 101, Fig. 10, carried by bell-cranks 102 in the frame 83 contact the tips of the jaws 94 which on damage operate further micro-switches 105 through sprung cranks 103. Operation. A slider falls from the shoot 34 and is traversed by the screws 17 to the nest plates 96 where the punch 111 operating between the nest plates 96 forces it downwards for final sizing and on to the mandrel 64, and simultaneously the frame 83 laterally converges the work-holding jaws 94 to control the internal V shape. The jaws 94 then raise the stamped slider until the bail of the subsequently fed slider forces it into the pair of exit screws 127 which transfer it to the exit shoot 146.