GB442328A - Improvements in and relating to the manufacture of sliding-clasp fasteners - Google Patents

Abstract

442,328. Sliding - clasp fasteners. REITER, B., 4, Fountayne Road, Stoke Newington, London. March 4, 1935, No. 6796. Convention date, March 5, 1934. [Class 44] A sliding-clasp fastener stringer has the elements clamped thereon by means of a continuously moving pair of toothed wheels, the teeth of which oppose one another but do not mesh, so that opposite intertooth spaces form pockets to receive the elements the legs of which are then pressed together to effect the clamping by the contraction of such pockets on approaching the point of tangency ; the wheels are grooved to receive the usual beaded edge of the stringer tape and the elements are pressed down on this beading by a leaf spring. The apparatus shown, which is the same as that described in Specification 442,358, feeds and clamps a predetermined but variable number of fastener elements on the two tapes, applies the top stops, pulls the two tapes through an automatically positioned slider, applies the bottom connecting stop, and severs the completed and engaged fastener. The elements are clamped on the two tapes 3, 4, by the two pairs 5, 6 o f continuously moving g wheels having their teeth opposing but not meshing, the elements being fed from shoots to lie with their legs in two oppositely facing tooth spaces. The subsequent contraction of these intertooth pockets at the point of tangency clamps the legs of the elements to the tapes. The control apparatus for giving a series of fasteners of any required length is shown in Figs. 3 and 4 and comprises ring members 63 mounted on top of the toothed wheels 5, 6 and carried round thereon until a projection 66 encounters a stop 70. A stud 74 can be inserted at any desired point along the ring member and in the course of travel of the ring actuates a tappet wedge 78 which briefly rocks a lever 82 thereby to raise the stop 71 restraining the next ring 63 which is thus released. This second ring in turn briefly rocks the lever 83 to release the third ring which similarly releases the fourth ring and this last ring in turn releases the first ring so that the series of actions continue. The rocking of the levers briefly closes an electric switch whereby a pin is briefly inserted in the feed shoots for the elements ; the resulting brief interruption of the feed of elements gives the spacing between successive fitted lengths of stringers. The tape is cut off, at points 46 not supplied with fastener elements, by a cutting device which is released when a feeler device 45 is lifted by the first element of a succeeding series.