Patent GB-1418961-A (GB)
Title: Spinning and winding of yarns
IPC: D01H4/50
Filed: 1973-08-20
Abstract: 1418961 Temporary yarn store; open-end spinning; feeding yarn back to rotor K BOUS 20 Aug 1973 [26 Aug 1972] 39198/73 Headings DID and D1F A method for continuously spinning, particularly open-end spinning, and subsequently winding yarns comprises storing a length of the spun yarn in a stacked and layered form during its travel under tension from the spinning point to a winding point, whereby, without interrupting the spinning process, yarn can be removed if desired from the store not only in the normal direction of travel but also in the reverse direction. In operation, yarn 1 from an open-end spinning rotor 4 passes through a yarn brake 34 and clamp 35, a yarn fault detector 42, and fault marker 43 to a pair of feed rollers 2 and 3 adjacent a storage chamber 5. The yarn is fed into the chamber 5 until the store 9 pushes a piston 8 to operate a switch 11 and signal lamp 12, whereupon an operator removes the end of the spun yarn from the store 9 via a passage 7 in the piston 8, and feeds it via a brake 13, paraffin applicator 13', thread guide 14 to a winding station where the yarn is cross-wound into a package 20. The winding station may be set to wind at a speed lower than the feed speed of the feed rollers 2, 3, and when the switch 11 is operated by the piston 8, the speed of the winding station is increased until the piston 8 ceases to operate the switch 11. In the event of a yarn break at the spinning rotor 4, a yarn feeler 29 sends a signal to operate a mechanism which disengages the drive of the feed roller 2 and reverses its direction of rotation whereby yarn is fed out of the storage chamber 5 back to the rotor 4 for joining with the fibres in the rotor. The mechanism comprises a disengaging cam 38 which turns through one revolution on receiving the signal from the feeler 29. The shaft 37 of the cam 38 also carries a driving segment 39, 39', which may be adjustable in arcuate length, which engages the periphery of the roller 2 to rotate same. On completion of one revolution of the cam 38 the rollers 2 and 3 feed yarn into the chamber 5 and the feeler 29 is in position to sense yarn 1. If the join is not successful, the operation is repeated a set number of times when the operator is signalled to effect the join manually. In a further embodiment, the mechanism to feed back the yarn from the storage chamber 5 comprises a disengaging disc and a driving disc each having cam surfaces and recesses whereby the length of yarn fed back to the rotor may be increased in steps. Alternatively, a given length of yarn may be fed back and then fed out of the rotor again in steps. In a further embodiment, the yarn is fed from the rotor by a pair of rollers, one of which is mounted on the end of a lever. The other end of the lever carries another roller which can engage with a further roller to feed the yarn in the reverse direction to the first mentioned pair. In the event of a yarn fault being detected at 42, a mark is placed on the yarn by means 43, which mark may be a dye or a radio-active substance. The yarn with the fault then passes into the chamber 5 where the mark is sensed by means 44 adjacent a knotter 47. A reciprocating hook 45 passes through the knotter 47 and into the chamber 5 via a slot 46 in the wall thereof and pulls the loop of yarn from the chamber and through the knotter. The knotting is effected and the waste yarn disposed of via duct 48. Alternatively, the fault can be cleared prior to entry of the yarn into the storage chamber. In a further embodiment, the yarn is fed into the storage chamber via a fluid nozzle which may additionally receive treating agents for the yarn. The chamber in this case is perforated to allow the treating agent and forwarding fluid to escape.