GB406801A - Improvements in or relating to the doubling or twisting of yarns or threads - Google Patents

Abstract

406,801. Twisting and doubling apparatus for imparting two twists per revolution. SOC. TEXTILE TWISTOK, Clos Montriant, Chamalieres, Puy-de-Dome, France. Oct. 31, 1932, No. 30449. Convention date, July 26. [Class 120 (ii).] In twisting and doubling apparatus for imparting two twists per revolution such as described in Specification 331,702, [Class 120 (ii)], a feeler is pressed against the bobbin or bobbins from which the yarn to be twisted or doubled is drawn and is arranged to operate a stop motion before the yarn is completely withdrawn from a bobbin. This enables, when doubling from several bobbins, the yarn from a new bobbin to be readily connected to that of the nearly exhausted bobbin within the apparatus before its association with the other yarns. When several bobbins are used the yarn from each bobbin is engaged by a feeler adapted to operate the stop-motion ; when the bobbins are mounted in a suspension carrier means are provided to stop the apparatus in the event of the oscillation of the carrier ; and the stop-motion is operated if the tension in any yarn is excessive. As shown, bobbins 2<1>, 2<11>, 2<111> are mounted in a stationary suspension carrier 1, and the yarns are united at an eye and pass as a thread b around a rotary frame constituted by end discs 7, 8 carried by hollow spindles 3, 4 and connected by deformable elements 9, 10 mounted, for example, as described in Specification 406,806. The main switch 15 of a motor 12 which drives the frame 7 .. 10 is controlled by an electromagnet 16 the circuit of which, comprising leads 17, 18, slip rings 42, 43, slip rings 38, 39, leads 57, 58 and leads 34, 35, is closed and the switch 15 opened (1) by detectors 261, 26<11>, 26<111>, normally adapted to bear on the supply bobbins 2<1>, 2<11>, 2<111>, and operable when the bobbins approach exhaustion, (2) by detectors 45<1>, 45<11>, 45<111>, normally supported by the intact yarns, and operable when any single yarn breaks, (3) by a contact 54 actuated by the combined yarns b against the action of a spring 53 when the tension is excessive, as described in Specification 331,702, [Class 120 (ii)], and (4) by a fork 61 adapted to engage the slip rings 38, 39 when the cradle 1 swings, as described in Specification 331,702. The detectors 26<1>, 26<11>, 26<111> are adjustable in length so that they fall, as shown in the case of detector 26<111>, when any desired amount of yarn remains on the bobbin. When the bobbins are wound in close coils, two detectors 26<1>, Fig. 2, may be provided for each bobbin and are arranged at an adjustable distance apart so that when one operates a length of yarn corresponding to such distance remains on the bobbin. If vertically-arranged bobbins are used the feelers are arranged to move in a plane tangential to the last layer of yarn. The electromagnet 16 may be arranged to release a mechanical gear and the driving- motor may be other than an electric motor.