GB1123793A - False twist crimping of yarn - Google Patents

Abstract

1,123,793. Crimping; oiling and winding yarns. KLINGER MFG. CO. Ltd. 23 Aug., 1965 [29 Aug., 1964], No. 35474/64. Headings D1F, DIJ and D1L. Monofilamentary, multifilamentary or staple fibre yarn, formed wholly or partially of one or more plastics materials such as nylon so that the yarn is capable of being heat set, is continuously crimped by passage through a heating zone, false-twisting so that the twist in the yarn runs backwardly into the zone, positively feeding to a take-up spool. Tension in the yarn between the false-twisting and positive feeding operations is 21-3 times the tension as the yarn enters the false-twisting operation and the tension in the yarn being fed to the take-up spool is ¢-4 grammes. The tension may increase by 1/3-2/3 through the heating zone. In a multi-station machine, Fig. 1, each yarn 33 passes from a supply bobbin 2, tortuously through a comb or gate stabilising device 3, through an adjustable gate or magnetic hysteresis tensioner 4 and positive feed device 5 comprising a roller 7 pivotable into and from driving engagement with a common shaft 6, thence (at an acute angle to the horizontal) across and in contact with one side surface of a common, hollow, oil-filled heater 12, through a falsetwister 13 e.g. a rotating spindle with a yarn engaging cross-pin or a friction driving belt, through a positive feed device 9 similar to device 5 and comprising a roller 11 driven from a shaft 10, over an oiling roller on a common shaft 22 and to a winding mechanism whereby the yarn is wound onto a bobbin releasably secured to a rotating spindle 34 or 34a. At each winding station the yarn passes through guides 39 and 40 carried on an swing- able arm 38 and extension 41 thereof, through a reciprocating guide 35 secured to an inextensible oscillating tape 36, thence to the bobbin. When the package is completely wound, a change-over mechanism is automatically actuated whereby empty spindle 34a is lowered into driving engagement with a roller 37 and the arm 38 is moved to a second position such that the guide 40 is opposite the empty bobbin. The yarn, in being transferred from guide 35 to a second such guide 35a, is drawn across the gap between the spindles it is gripped by castellations on the end of spindle 34a and is broken as a result of the peripheral speed difference between the wound package and the new spindle, whereupon the winding of a fresh package proceeds as the full bobbin is detached from its drive. The arms 38 on the machine may be actuated simultaneously through individual rack and pinion mechanisms (not shown) operated by nueumatic cylinders connected to a single compressed air source. The oiling apparatus, Fig. 3, comprises a reservoir 23, a roller 21 driven by a variable speed motor and which transfers oil 24 to the periphery of a yarn contacting roller 25 in driving engagement therewith. The oil is replenished manually or automatically in conjunction with a controlled feed, or a level sensing unit, from a single source. The requisite yarn tensions are determined by adjustment of the speed of roller 6, the relative speed of rollers 6 and 11, and the relative speed of roller 11 and the take-up spool, and/or the tensioner 4 in conjunction with the use of which the driven rollers 6 and 7 may be rendered inoperative e.g. by detaching roller 7 from roller 6, disconnecting the drive to shaft 6, or by-pass guides (not shown).