Patent GB-443182-A (GB)
Abstract: 443,182. Drawing untwisted sliver and roving. REYNOLDS, W. G., c/o Terrell Machine Co., Charlotte, North Carolina, U.S.A. April 26, 1935, No. 12555. Convention date, July 23, 1934. [Classes 120 (i) and 120 (ii)] In a process of continuously drawing substantially untwisted sliver and roving by alternate drawing and condensing the sliver is held against expansion when passing from a drawing roller to the next condensing roller in at least that part of the passage immediately succeeding drawing by the sole means of rotary surfaces of the rollers. The sliver may be so held during substantially the whole of its passage from a drawing nip to the following condensing nip. In a roving frame employing feed rollers 14, 14<a>, Fig. 1, drawing rollers 25, 27, a tongued or presser roller 33 and co-operating grooved roller 31, and drawing rollers 37, 39 .. the sliver 5 condensed through a guide 7 having a rectangular orifice and drawn by the rollers 25, 27 is then wrapped round a considerable arc of the lower drawing roller 27 and made to enter within the bevelled walls of the grooved roller 31 immediately it leaves the surface of the roller 27 being thus controlled and held against flaring outwardly. In a spinning frame the sliver 5, Fig. 9, passes through a condensing guide 7 and is then fed by tongued-and-grooved feed rollers 9, 11 successively through drawing rollers 25, 27 ; 37, 39 ; 45, 47 ; 53, 55 and tongued-and-grooved roller pairs 31, 33 ; 41, 43 ; 49, 51 arranged alternately. This arrangement gives the sliver a substantially horizontal extent in the intervals where drafting occurs. The tongued rollers are preferably formed with either spur or helical flutes at 17, the teeth being deep cut to ensure a positive feed of the sliver and also a cleaning of the fibres, the foreign matter being received within the flutes. With ordinary feed rollers 14, 14<a> the axis of the guide 7 is in the tangential plane at the nip. As shown in Fig. 9 the guide 7 is slightly above the corresponding plane but points into the nip 9, 11. There is no folding action by the rollers 9, 11. The grooved top rollers 9, 31, 43, 51 (weighted if necessary) are driven so that the surface 15, Fig. 8, forming the bottom of the groove travels at a substantially slower rate than the teeth or flutes 17 on the coacting tongued rollers 11, 33, 41, 49. The first drawing rollers, which may comprise a fluted metallic bottom roller 27 and a covered top roller 25 frictionally driven therefrom, are usually set apart from the rollers 14, 14<a> or 9, 11 by a distance slightly greater than the staple length and produce a draft of from 3 to 6, after which it is necessary to compact and condense the fibres, the tongued-and-grooved rollers 31, 33 producing a complete inward folding of the lateral margins and protruding fibres. The tongued roller 33 is driven slightly faster than the drawing rollers 25, 27, e.g. 1À04 to 1À06 times as fast to produce not a drafting but a take up of the expansion of the fibres after drafting at 25, 27. The same principles are followed through the other sets of rollers. The sections of tongued rollers are made axially adjustable by forming the shaft section 22, Fig. 7, having four tongued rollers 11 and two driving gears 23 with a reduced portion 71 externally threaded to engage in the bore 73 in the end of the adjacent section, an oppositely-handed screw 75 being adjustable in the part 71 to determine the extent to which the part 71 can enter the bore 73. Specification 332,079, [Class 120 (i)], is referred to.