GB686889A - Machine for making slide fasteners - Google Patents

Abstract

686,889. Sliding clasp fasteners. ANCHOR SLIDE FASTENER CORPORATION. April 25, 1951 [May 3, 1950], No. 9595/51. Class 44 A machine for making sliding clasp fasteners comprises means for advancing preformed wire, means for severing elements from the end of the wire and means for advancing the tape past a point where the legs of the severed element are closed on the tape by clamping jaws. Fig. 1 shows a plan view of the machine and Fig. 4, a section. Preformed wire (shown in Fig. 6) is advanced in steps through a guide 36 by a wheel 38 having square teeth adapted to engage between the projections 53 on the wire. The wheel 38 is mounted on a spindle 40 carrying a rachet wheel 171, Fig. 3, driven by a pawl 135 on an oscillatory link 168 connected to an eccentric on the main drive spindle 152 of the machine. On the other side of the wheel 38 the wire passes under punch dies 47, 56, 57 carried on a reciprocating bridge 65, Fig. 4, driven through rods 66 by a cam follower lever 165. The die 47 is shaped to sever an element 32, Fig. 6, from the end of the wire and to form spread legs 28, 29 of the next element. Dies 56, 57 form side notches in the strip. During the descending movement of the bridge adjustable cam pieces having sloping end faces engage the sloping end faces of sliding clamping jaws 95 adapted to close the legs of the end element on the bead 100 of the tape simultaneously with its severance from the wire. The jaws are opened after the clamping operation by springs. The tape is gripped adjacent this point by a pair of toothed discs 102, Figs. 1, 6, mounted on inclined spindles 120 and adapted to advance and position the tape as shown in Fig. 7. The spindle 120 is driven by a rachet wheel 159 actuated by a pawl connected to an eccentric. The discs are connected to move together by a gear wheel 116 engaged with the teeth thereon. The feed mechanism for the wire strip is interrupted by projections carried on an endless chain 129, Figs. 1, 3, running over sprockets 126 driven through worm gears from the spindle 152. The projections displace a sliding link 131 having an arm 133 adapted to lift the pawl 135 to interrupt the drive to the spindle 40. This produces a gap in the elements on the tape. The number of sections produced may be counted by displacement of the link 131.