Patent GB-537335-A (GB)
Title: Improvements in the preparation of staple fibre sliver from continuous filaments
IPC: D01G1/10
Filed: 1939-09-11
Abstract: 537,335. Forming staple fibre sliver from continuous filaments. CAMPBELL, N. S. Sept. 11, 1939, No. 25578. [Classes 120 (i), 120 (ii) and 120 (iii)] Staple fibre sliver is produced by continuously feeding continuous filaments to cutting, condensing, false twisting and packaging operations, the fibres during the operations being engaged at all times by control means; the sliver is thus obtained in a form suitable for further operations without the false twist being allowed substantially to escape. As shown in Fig. 1, bundles of continuous filaments are fed from a package 15 by rollers 16, 17 to a trough 19 or travelling apron from which they pass in web form to rollers 21, 22 which with cutting rollers 25, 26 and delivery rollers 23, 24 control the movement of the web ; the cutting rollers 25, 26 are provided with cooperating helical cutting ribs which form oblique cuts in the web, the cut sections being fed by the rollers 23, 24 to a pair of travelling aprons 40 by which they are controlled and forwarded to a gill frame 50 having intersecting faller bars. From the gill frame the fibres are drawn by rollers 58, 59 rotating at a greater surface speed than that of the needles of the gill box and fed into the condensing device the base of which is formed by an apron 88, Fig. 4, passing over the roller 59, a plate 93, an idler roller 89 and a tensioning pulley. The sides of the condensing device are formed by a pair of belts 75, 79 arranged on edge in the apron 88 with the runs 78, 86 converging towards the delivery end of the device and forming with the apron 88 a triangular funnel in which the fibres are controlled and condensed ; the belts pass around vertical driven rollers 62, 63 and idler pulleys and the pulleys 80, 81 of the belt 79 are carried by L-shaped brackets 83 so that the belt 79 is swung towards the belt 75 and the sliver nipped between the belts as they run around the pulleys 77, 80. In a modification the apron 88 runs over a roller adjacent the roller 59 of the gill frame. From the condensing device the sliver passes between the endless belts 101, 101<SP>1</SP>, Figs. 7 and 9, of the false twisting device, the belts being carried by pairs of rollers 114, 115 at the ends of a rectangular tube 113 mounted within a cylindrical drum 111 carrying a gear 112 which is geared to a shaft 207 carrying a drum 200 splined thereon and having spaced grooves which extend nearly the whole circumference of the drum with their ends connected by U-shaped grooves; a driven gear engages pins 205 equidistantly spaced along the marginal edges of the grooves and rotates the drum 200, and consequently the drum 111, alternately in opposite directions. The rollers 115 at one end of the tube 113 are urged by springs 119 to tighten the belts 101, 101<SP>1</SP> and the rollers 114 at the other end of the tube are geared together and forced towards one another by a spring, one of the rollers 114 being geared to a bevel pinion 144 meshing with a rim gear 141 on a ring 139 rotatably mounted on a rim gear 137 fixed on the drum 111 and meshing with a bevel pinion 147. The ring 139 also carries a rim gear 142 meshing with a bevel pinion 146 and the pinions 146, 147 are carried in an annulus 148 which is revolvably mounted on the drum the pinion 146 also respectively meshing with a rim gear 132 rotatably mounted on a ring 130 carried by a sleeve 126 rotatably mounted on the drum and driven by a pulley 135 and the pinion 147 meshing in the teeth on the ring 130; by this arrangement the endless belts 101, 101<SP>1</SP> are always driven at the same speed and in the same directions regardless of the direction of rotation of the drum 111, and twist inserted at the entrance into the false twisting device is held by the belts while further twist in the same direction is added as the sliver leaves the device. The sliver carrying the false twist on emergence from the twisting device is immediately gripped by belts 189, 196 and delivered to a packaging roll 181 supported by fluted rollers 179 and slidably mounted in slots in a frame 176 which with the supports for the belts 189, 196 are reciprocated by a rotating crank pin engaging a slot in a disc 183 on the underside of the frame. In a modified form of false twisting device, the driven belts for twisting and forwarding the sliver are carried in frames which are reciprocated in opposite directions by a strap and oscillating sprocket gearing, the drive of which is taken from a shaft carrying bevel pinion gearing with a driven mutilated bevel gear, stops carried by the bevel gears ensure accurate meshing of the teeth. Specifications 537,366 and 537,367 are referred to.