GB962156A - Improvements in or relating to apparatus for manufacturing sliding clasp fastener stringers - Google Patents

Abstract

962,156. Moulding sliding clasp fasteners. S. F. WARREN. (Opti-Holding A.G.). June 15, 1960, No. 21024/60. Heading B5A. [Also in Division E2] Apparatus for making a sliding clasp fastener stringer comprises means for forming a synthetic plastic filament into a wavy configuration, means for bending the wavy filament into U-shape, means for sewing the filament to a stringer tape, and means for operating all the abovementioned means in synchronism. As shown, the apparatus comprises a separable forming tool 2a, 2b for forming a single loop in the filament each time the tool is operated, the loops being held in position by pins 11a, 11b around which each loop is located, the pins supplying the formed wavy filament, one loop at a time, to a stamping tool 15 which stamps fastener elements 1b on each leg of each loop along the median line of the wavy shape of the filament, and in which a disc 16 or other flat pressure member, located perpendicular to the wavy configuration, presses the filament into a channel-shaped guide member 14 to form it into a U-shape about the median longitudinal line, the shape of the filament thus formed being fixed by a heating device 16a. Additional stampings 1c are effected in the legs of each loop to locate narrow bands 4, 5 which are sewn simultaneously with the filament to the tape 3. The filament is fed through fixed eyes 7 and 9 from a roll 6 and after passing the forming tool 2a, 2b is engaged by the pins 11a, 11b which are mounted on a movable strip 10 and by means of which the looped filament is fed to the guide member 14 where the loop formation is retained by a spring-loaded bar 13 prior to the operation by the stamping tool 15 and disc 16 and the subsequent fixing by the heating device 16a. The diso 16 may be loosely rotatable or it may be driven. The completed fastener chain is fed over a guide strip 17 having a pointed end 18, adjacent to which the tape 3 and bands 4 and 5 are fed to the chain and thereafter the whole stitched together by sewing needles 19. One of the bands 4, 5 may be replaced by the lower thread of a double chain stitch sewing operation. A slotted control tape 23 is arranged to control the spacing between successive lengths of filament by controlling the operation of a reciprocable knife 22. Specification 962,157 is referred to.