Patent GB-573846-A (GB)
Title: Improvements in or relating to methods of spinning strands of fibrous material and mechanisms therefor
IPC: D01H1/08
Filed: 1942-06-17
Abstract: 573,846. Spinning and twisting yarns &c. McCANN, J. J. June 17, 1942, No. 8311. [Class 120 (ii)] A continuous strand of fibrous material is spun by moving the strand longitudinally along a path including a drawfield 14,65-4, 5, Fig. 1, teetering (or rapidly vibrating) and twisting on its own axis a portion of the moving strand at an intermediate point 15 in the path within the drawfield, additionally twisting the strand at 24 beyond the drawfield and extending the additional twist into the initially-twisted portion of the strand. The strand is held substantially above the intermediate point and is successively gripped and released at a number of relatively-spaced points below the intermediate point in such sequence that the strand is always gripped at one of the relatively-spaced points. The strand 12 passes from delivery rollers 14, 65 through a twist tube 15 to the pairs of drawing rollers 4, 5 the rollers 5 having a continuous circumferential periphery and each co-operating roller 4 having peripheral portions 6 and two flat portions 7. The rollers 4 are driven synchronously and frictionally engage the idler rollers 5. The strand is always gripped by one unit. More than two pairs of rollers 4, 5 may be provided. The top end of the twist tube 15 is slotted at 18 to form shoulders which cause a rapid vibration or teetering of the yarn which passes downwardly through a tubular guide 20 and a tube 22, Fig. 6 provided with a restricted outlet 25 and extending into a spinning pot 24. The guide 20 is divided by a partition 26 into two channels 28, 29 the former serving to conduct the strand therethrough with a minimum of ballooning while the latter may be used to conduct steam downwardly into the spinning pot 24 to condition the yarn. The pot 24 is formed with an open top chamber 32 and a smaller bottom chamber 34 having openings 38 which, on its rotation, serve to draw air downwardly through the pot. The tube 22 which has a conical element 46 frictionally mounted thereon and adapted to support a paper cone or bobbin 47 is reciprocated longitudinally over the guide 20 by a yoke 40 carried by a rod 42 which is mounted on the reciprocating traverse rod 41, the yoke 40 engaging a grooved collar 39 provided on the top of the tube 22 and a bearing collar 45 being provided on the bottom of the guide 20. The rollers 4 are driven from a motor 50, Fig. 7 through the adjustable belt system 51-55 a gear 56 on the shaft 55 engaging pinions 57 on shafts 58 carrying the rollers 4. The lower rollers 65 co-operating with the rollers 14 are driven from a sheave 59 on the other end of one of the shafts 58 through similar members 60, 62-64. The rollers 5 are carried on shafts 74, Fig. 12 mounted in slots 75 in the end plates 71 of a unit 70 and are under the control of a rod 76. When a bifurcated lever 83 is in the position shown in Fig. 7 the spring 80 through the rod 76 and plates 78, 79 holds the rollers 5 in strandgripping contact with the rollers 4. When the lever 83 is tripped to the dotted position, Fig. 7, the spring 82 separates the rollers 4, 5. The twist tubes 15 are driven by a motor 86 and V-belt 87, Fig. 14, and the spinning pots 24 by a motor 88 and V-belt 89, idler pulleys on posts adjustable in slots in the machine frame being provided. One side of the control circuit of the driving motor is earthed while the other side is connected to a bar 96 mounted on but insulated from the frame at 94 so that if one or more of the pots 24 gets out of balance the motor is reduced in speed or stopped. U.S.A. Specification 806,086 is referred to.