GB484190A - Improvements in the manufacture of staple fibre products from continuous filaments - Google Patents

Abstract

484,190. Forming staple fibre products from continuous filaments. DREYFUS, H., and POOL, W. July 31, 1936, No. 21210. [Class 120 (iii)] A substantially twistless bundle of associated continuous filaments is converted into a staple fibre product by feeding it forward, separating the filaments at the end of the bundle from one another, cutting from them predetermined lengths successively to yield groups of fibres, and while the cut fibres are still separate, assembling the groups so that forward ends of the fibres of each group overlap the rearward ends of those of the preceding group, and then compacting the fibres into a continuous staple fibre product. In the apparatus described a bundle of filaments 8, Fig. 1, is drawn by nip rollers 10 from a supply bobbin 9 through guides 11 and a gate tension device 12 and is fed into a hole 14, Fig. 6, and out through a flared orifice 15 of an ejector nozzle fed with compressed air from a conduit 17. The air jet as seen from above has three diverging passages 19, Fig. 7, in order to spread the blast and cause the filaments to issue in a spread fan shape. The separated end portions of the filaments on leaving the orifice extend across an endless permeable band 20 which is driven over a suction conduit 21 by a roller 22 and kept taut by a spring-loaded idler 23. Perforations 27 in the conduit cause the free ends of the filaments to be held as shown in Fig. 1. Simultaneously the air blast to the nozzle is momentarily interrupted by a spring- loaded valve 50 and a forked deflecting member 30 descends upon the filaments and presses them into contact with the teeth of a " hair-clipper " type cutting device 31 placed diagonally across the path of the filaments. The cutter is then operated to sever the filaments and form fibres, the rear ends of which are sucked on to the band 20 by air currents passing into the perforations 28, the currents being concentrated on the cutter by a shield 29. On operation of the cutter, a deflector member 32 is moved temporarily to the right, as shown in Fig. 3, to disengage the cut ends of the filaments from the blades of the cutter. As the deflector moves back to its normal position, the air blast is re-started. The rate of movement of the band 20 and the rate of feed of the filaments are so adjusted that the groups of cut fibres overlap so as to form a continuous assembly 33, Fig. 4, which is fed forward to rubbing bands 34 driven by rollers 35. The lower rubbing band is reciprocated transversely by crank mechanism 36 so as to compact the assembly into a substantially cylindrical staple fibre product 37 which is twisted into a yarn 38 and wound on a bobbin 39 by a ring spinning device 40. Specifications 410,805 and 484,191 are referred to.