Patent GB-630131-A (GB)
Title: Improved fibre-stapling and sliver-forming apparatus and method
IPC: D01G1/08
Filed: 1946-04-26
Abstract: 630,131. Stapling fibres and forming them into slivers. TRIGGS, W. W. (Pacific Mills). April 26, 1946, No. 12607. [Classes 120 (i), 120 (ii) and 120 (iiii)] A sliver of non-conterminous textile fibres is produced by fracturing a fibrous web into staple fibres, drafting the staple fibres and passing the drafted web between surfaces driven at different speeds to advance one face of the web at a faster speed than the other, thereby rendering the fibres non-conterminous. Fibres from packages 130, Fig. 2, on a creel 6 are led through holes in a frame 140 mounted in a slideway and capable of reciprocation by a crank 174, whereby the angle of feed of the fibres may be varied in order to alter their cut length. The frame 140 may be set to remain in any desired position during operation or may be reciprocated to obtain fibres of mixed lengths. The fibres are spread into a web 8 by rollers 144, 146, 148, and tensioned slightly before entering fracturing rollers 10, 12. The upper fracturing roller 10 is spring-urged against the lower roller 12 and has helical threads on its periphery, the spaces Between the threads being filled with a resilient composition flush with, or a little deeper than, the threads. A brush 184 clears the roller 10 of short fibres and is in turn cleaned by a card covered roller 186. Complete separation of the fibres is ensured by passing the web 8 between fluted rollers 24, 26. A dis-alignment of the fibres in the upper part of the web with respect to those in the lower is effected by rollers 28, 44, 46, which rotate in conjunction with, but at a higher speed than, an apron 36 pressed against them in accordance with the tension applied by an adjustable roller 43. Succeeding rollers 50, 52 rotate faster than rollers 28, 44, 46 to draft the fibres and deliver them to further dis-aligning members 60, 62, 64, 66 and drafting rollers 80, 82. In modifications, the aprons 36, 60 may be dispensed with and upper and lower roller arrangements provided. An apron 86 passes round roller 82 to support the fibres and carry them forward to be rolled into a sliver by a ribbed rotating cylinder 100, Fig 4, located obliquely across the apron 86 The cylinder 100 is freed of loose fibres by streams of air from a jet 220. The rolled sliver is drawn from the apron 86 by rollers 110, 112 through a stationary guide shield 226 and a rotating trumpet 108 having a triangular throat 240 to be delivered to a crimping box 223. A stop-motion may be interposed between the guide 226 and the trumpet 108 to stop the apparatus upon sliver breakage. To reduce static electricity in the fibres, on the apron 86, two metal-surfaced idler rollers 92, 94 make contact with the web and are electrically connected to the framework of the apparatus. The fibres may also be moistened by damping the apron 86 by rollers 212, 214, one of which rotates in a tank 210 containing water. After the sliver has been formed it may be provided with an anti-static oil finish. Natural and/or synthetic fibres may be mixed before cutting, or uncut fibres may be introduced into a cut web as it leaves the fracturing rollers.