GB832261A - Improvements relating to the knotting of the ends of textile threads - Google Patents

Abstract

832,261. Knot-tying. ZELLWEGER Ltd., FACTORIES FOR APPARATUS & MACHINES USTER. April 4, 1957 [April 4, 1956], No. 11040/57. Class 112 Two threads b, laid side by side, are knotted together by forming a loop a therein, winding the thread ends c around the threads b at the base of the loop for a turn and a half, as at d, passing the ends c through the loop, and pulling the threads to tighten the loop. In apparatus, Fig. 4, for forming the knot a hollow mandrel 1 is mounted on a casing 3 and slidably supports a rod 4 which is formed at its outer end with a hook 5 and is linked at its inner end by a pin 7 with a lever 8 adapted to be oscillated by means of a cam 9 carried by a shaft 10. An ejector 11, slidable in a longitudinal groove formed in mandrel 1, is linked at its inner end by a pin 12 to a lever 13 adapted to be oscillated by a cam 14 on shaft 10. A gear 15 on shaft 10 meshes with a gear 16, the hub of the latter being journalled on mandrel 1, and gear 16 rotating three times for each revolution of shaft 10. A sleeve 17, keyed to but slidable on the hub of gear 16, carries at its outer end a thread-gripper 18 and is formed at its inner end with a circumferential groove engaged by a fork 19. The later is fixed to one end of a slidable rod 20 linked at the other end by a pin 21 to a lever 22 adapted to be reciprocated by a cam 23 on shaft 10. The arrangement is such that the ends c are seized by the gripper 18 and are carried around the mandrel 1 to form the loop a, the outer end of the loop lying inwardly. During the next revolution and a half of the gripper, sleeve 17 is moved successively outwards, inwards and finally outwards to form the loop d and to place the thread ends in the hook 5. The latter is then retracted to pull the thread ends through loop a to form the knot. The ejector 11 then moves outwardly to remove the knot from the mandrel, and finally the threads are pulled to tighten the knot and to release the ends from the hook. In a modification, Fig. 9, the knot is formed by a rotary bill which is carried by a shaft 34 and comprises a fixed blade 32 and a movable thread-cutting blade 33. A gear 36 on a shaft 34 meshes with a gear 37 on a shaft 38, shaft 34 rotating twice to each revolution of the latter. A lever 42 is adapted to be oscillated by a cam 39 on shaft 38, and carries an arm 43 formed with a thread-holding notch 44 adapted to carry the thread ends c from one side to the other of the knotting bill.