Patent GB-514564-A (GB)
Title: Improvements in or relating to the manufacture of staple fibre yarns or like products from continuous filaments
IPC: D01G1/10
Filed: 1938-05-10
Abstract: 514,564. Producing staple fibre yarns &c. from continuous filaments. DREYFUS, H. May 10, 1938, No. 13929. [Class 120 (iii)] A staple fibre yarn or like product is formed from a band of continuous filaments by feeding the latter, separated from each other into the nip of a pair of contacting travelling surfaces, cutting each filament separately while it is travelling through the nip of the travelling surfaces so that the cutting points are distributed lengthwise of the filaments with the end of a fibre produced by one filament displaced in the lengthwise direction of the filaments, from that of a fibre produced from a neighbouring filament and the ends of all the fibres produced by cutting one section of the number of filaments substantially uniformly distributed with respect to each other in the lengthwise direction of the fibres; the resulting fibres are then compacted and twisted into continuous coherent yarn or like product. As shown separate filaments 53 from a jet 2 are kept separated by passage through a comb 5 and pass between a pair of rollers 6, 7 forming the contacting travelling surfaces; the roller 7 having a covering 8 of gutta-percha which enables the filaments to be gripped between the rollers and provides a cutting bed for a helical blade set in the roller 6 and having its edge lying flush with the surface of a rubber covering on the roller which is driven by a sprocket 11. The band of separated filaments is cut along lines at an acute angle to the length of the filaments; the distance between the lines being equal to the periphery of the roller 6 and the end of one fibre being displaced a substantial distance from a fibre produced from the adjacent filament. The band of cut fibres then pass over a support 14 to the nip of a pair of rollers 15 between which and a second pair of rollers 16 is stretched a pair of elastic bands 17, 18 which convey the fibres to a trumpet 20 from which they pass to a guide 21 and a cap spinning device 22; the band of fibres may pass directly from the roller 7 to the funnel 20 and the roller may be mounted on a spring-controlled lever provided with a handle by which the roller may be moved from the roller 6 to enable the filaments to be passed between the rollers when starting operations. The cutting roller 6, Fig. 7, comprises a barrel 31 carrying a sleeve 32 having a helical projection 33 formed so that the gap between the side of the projection progressively narrows from the right to the left of the roller ; the helical blade 9, formed in two sections, is threaded on the member 32 so that pins 36 therein engage holes in the blade and a helical member 35 having its sides cut to the shape of the gap between the sides of the projection 33 is then screwed on the sleeve to clamp the blade in position, the pins 36 being received in a groove in the edge of the member 35, which is screwed in position by a flange 39 and bolt 40. The members 32, 35 have rubber coverings lying flush with the blade 9. Specifications 424,683, 424,752, 424,830, 424,879 and 484,190 are referred to. According to the Provisional Specification the compacting and twisting of the cut fibres may be carried out in the manner described in Specification 489,272 ; each of the filaments may be cut by a separate knife of a number arranged in staggered form around the periphery of a roller; an endless supporting band may form the cutting bed and slots may be provided for the reception of the several knives ; a cutting member of the guillotine or of the hair clipper type may be used; suction may be employed to assist in keeping the filaments separated during cutting ; and the fibres may be compacted by a number of endless belts which may be permeable to enable suction to hold the fibres in assembled position.