Patent GB-823396-A (GB)
Title: Improvements in and relating to hand-operated knotters for yarns and threads
Inventor: COOK DEREK NORMAN
IPC: B65H69/04
Filed: 1956-04-12
Abstract: 823,396. Knot-tying devices. COOK & CO. MANCHESTER Ltd. April 1, 1957 [April 12, 1956], No. 11108/56. Class 112 [Also in Group XXXV] A hand knotter which, it is stated, ties a weaver's knot with an extra turn or turns for preventing slip, comprises a body 10 carrying a knotting bill 17 which, on depression of a trigger 20, is driven through two revolutions. Fixed to body 10 are side plates 22, 23 formed in their upper edges With notches 27 and 36. Fixed externally to plate 22, and separated by a plate 22a, not shown, is a notched plate 25. A plate 28 fixed internally to plate 22 has its lower end spaced therefrom. A bar 29 slidably mounted on the inside of plate 22 is pivoted to one arm of a bell crank lever 31, the other arm of which has a slot 32 engaged by a pin 33 on trigger 20, whereby operation of the latter moves bar 29 between plates 22 and 28. A thread guiding member 26 which expends between plates 22 and 23 is fixed externally to plate 23, being separated therefrom by a plate 23a; not shown, and provides a slot 37a between itself and plate 23. A member 37, pivoted at 38 inside plate 23, is formed with a notch which is normally aligned with slot 37a. A bar 40 slidably mounted on the inside of plate 23 is pivoted at 39 to member 37 and at 41 to one arm of a bell crank lever 42 fulcrummed at 45. The other arm of lever 42 carries a stripper member 44 formed at its free end with a hook 51. One arm of a lever 49, fulcrummed at 49a, has a pin and slot connection 42a, 49b, with the said other arm of lever 42. The other arm of lever 49 is formed with a notch 48 engaged by a tongue 47 on a member 46 rotatable with the trigger 20. The arrangement is such that during the first revolution of the kiiotting bill, tongue 47 slides along one edge of notch 48 and during the second revolution engages the other edge to swing lever 49, whereby the hook 51 on stripper 44 is raised, and the notch in member 37 is swung downwardly away from slot 37a. To operate the knotter, a first thread is laid in the notch in plate 25 and is then passed forwardly of the guide 26 and down slot 37a to be laid in the notch in member 37. A second thread is passed over the rear edge of plate 25 and down the upper edge of plate 22 into notch 27, and the thread is then passed behind guide 26 and down the upper edge of plate 23 into notch 36. On depression of the trigger, finger 29 moves forwardly to nip the second thread, and the bill 17 proceeds to form a knot. At the commencement of the second revolution of the bill, the stripper 44 rises, whereby hook 51 engages the second thread held by finger 29 to tighten the knot, and member 37 swings downward to present the first thread to now open scissors in the knotting bill, whereby said thread is cut at the knot, and finally a scissors blade 50 on the stripper is operated to cut the first thread at the knot. The plates 22 and 23 may be made of or covered with nylon or a similar material which, it is stated, prevents the generation of static electricity when engaged by the threads and thus allows the latter to be laid quickly.