Patent GB-1115736-A (GB)
Title: Improvements in textured yarn and method and apparatus for making same
IPC: D02G1/00
Filed: 1965-07-26
Abstract: 1,115,736. Finishing yarns and fabrics; knitting machines. TEXTILE MACHINE WORKS. 26 July, 1965 [27 July, 1964], No. 31770/65. Headings DIC, D1F and D1S. Textured yarn is provided by knitting yarn into a fabric, heat-setting, de-knitting or unravelling the yarn and subjecting it to an opening or builking operation. In the continuous operation shown, a nylon multifilament yarn Y, supplied from a pirn 10, is wrapped in one or more turns around draw roll set 13 and fed thereby to a single knitting head 17 for conversion into a continuous fabric tube T. The withdrawn tube is flattened by passage around a roller 25 and is heat-set e.g. at a temperature of 195-215‹C, under controlled conditions between the metal platens 40-41 of a heater 27. Ambient, or a stream of, air cools the fabric as it passes to an unravelling paint, as at P, whence the recovered "corrugated" yarn, Fig. 11 (not shown) passes through a bulking apparatus 55 whereby the corrugations of the filaments separate from a parallel nested formation and project in different planes to impart bulkiness and stretch properties to the final yarn, Fig. 12 (not shown) which is wound into a package 61. The motor 30 drives drawn-off rolls 29, the cam cylinder 21, and rolls 13 through shafts 31, 32, at speeds correlated to provide for continuous formulation of fabric and its subsequent movement. The heater 27 comprises a fixed platen 40 and movable platen 41 operated by a solenoid 57, Fig. 8 (not shown) through link and lever mechanism 50, 47, 46; the platens may be manually or automatically separated to protect the fabric from overheating e.g. if its travel is arrested. The position of P, which varies according to fluctuations in working conditions, is maintained between limits determined by air jets (from tubes 74, 75) directed to pass through perforations 72, 73, in plates 70, 71, and impinge on switch blades 68, 69: according to whether the path of one or both jets is/are obstructed or are unobstructed (because the fabric has unravelled upstream of the jets) switches 66, 67, are oiperated to energise and deenergise relays whereby alternative field windings cause the motor 65 (providing the drive to draw-off rolls 52 and package-driving roll 62) to rotate correctively at high or low speed to restore the position of P. The device 55 comprises two separable, arcuate shoes. Figs. 2-4 (not shown) carrying brushes which are relatively movable (with adjustable pressure therebetween) to "scrub" the travelling yarn: alternative devices, Figs. 5, 6 (not shown) and Fig. 7 (not shown) comprise rubbing pins through which the yarn is guided in a tortuous path, or a roller around which the yarn passes and then makes a sharp turn over itself to produce a sustained rubbing action. In alternative methods, the fabric tube is stored e.g. as a wound package, and unravelled subsequently, and/or the unravelled yarn is wound into a supply package for the knitting machine, loom &c., which forms a final fabric; bulking may be effected by any of the described devices (as 55) at such machines &c. The yarn Y, in its travel between pirn 10 and rolls 13, may pass through a device, Fig. 10 (not shown) comprising coacting fluted rollers whereby yarn filaments are stapled.