Patent GB-807613-A (GB)
Title: An improved weaver's knot and a method of and means for forming the same
Inventor: SMITH CHARLES ROLAND
IPC: B65H69/04
Filed: 1954-11-08
Abstract: 807,613. Knot-tying devices. MELLOR BROMLEY & CO. Ltd. Nov. 3, 1955 [Nov. 9, 1954], No. 32267/54. Class 112 A weaver's knot, formed by interengaging a closed loop a and open loop b, is modified by passing an additional loop e, formed in the end of loop a, through loop b, tightening the knot to retain the additional loop, and severing the latter to separate the two side-by-side portions e<SP>1</SP> threof. A knotter for forming the knot comprises means for supporting two yarn ends, a rotary tying bill adapted to form the knot and to produce the additional loop, a stripper adapted to remove the knot from the bill and to tighten the knot, the additional loop being retained on the bill, and the latter being adapted finally to sever the additional loop. The knotter comprises side plates 2, 3 connected together by a plate 4 and a member 5 of inverted U-form. Journalled at 9 in the inner limb of the latter at 11 on plate 4 is a rotary carrier member 7 having a helical formed portion 7a. On actuating member 8, journalled at 12 between the side plates, has a thumb piece 8b and is bifurcated to form limbs 8a and 8d, the former of which cooperates with portion 7a to turn member 7 when the thumb-piece 8f is depressed against the bias of a spring 13 the rear end of member 7 carries a tying bill 6 comprising a rigid element 14, a resilient element 15 and a thin blade 16 pivoted at 17 between the elements 14, 15. Blade 16 has a cam-shaped tail 16a which passes through a circular hole 18 in the outer limb of member 5, the axis of hole 18 being offset from that of member 7 so that rotation of the later causes pivoting of the blade. Element 15 has a sharpened edge 15a adapted to co-operate scissorfashion with a sharpened edge of blade 16, edge 15a being however formed with a recess 15b which prevents severing of a strand trapped between blade 16 and element 15 in the normal position of the blade. The rear ends of plates 2 and 3 are offset outwardly, and though the offset portions project the rear ends of members 22 and 26 which are longitudinally slidable on the outer surfaces of plates 2 and 3, and which are connected together by a pin 30 passing through slots 31 formed in plates 2 and 3. The rear end of member 22 is pivoted at 21 to an element 19 which is pivoted at 20 to plate 2 and has an upstanding finger 19a which divides a notch 2b in plate 2. Member 26 is pivoted at 29 to an element 27 pivoted at 28 to plate 3 and normally positioned rearwardly 'of a pair of solts 23, 24 in the latter. A knot-stripper and tightener 33 is pivoted at 34 between the plates 2, 3 and curves rearwardly and downwardly, the free end being bifurcated, one arm being formed with a notch 33b, and the outer arm with a scissor blade 37a. Pivoted at 38 to the latter is a scissors blade 37c having a tail 37d formed with a slot 40 which contains a pin 39 carried by an arm 41 frictionally or resiliently coupled to member 33 so as to turn with the latter. To form a knot strands y, y<SP>1</SP> are laid in notch 2b on opposite sides of finger 19a, on opposite sides of bill 6, and in notches 23, 24, when thumb-piece 8b is depressed. Pin 30, which engaged in a notch 32 in member 33 is thereby moved rearwardly, when element 19, 27 pivot relatively to members 22, 26 to cross the strands on either side of bill 6. Pin 30 then leaves notch 32 and bill 6 rotates to form loop b, to interengage loop a therewith and to draw the additional loop e through loop b. Limit 8d then contacts a projection 33d of member 33 to turn the latter, so that the formed knot is tightened and pushed off the bill 6 by member 33. When a flange 41a on member 41 reaches the end of a slot 42 in plate 3, member 33 moves relatively to member 41 and blade 37c closes on blade 37a to sever the free ends of the strands. A projection 33f of member 33 finally makes contact with the front end of a member 43 pivoted at 44 between the plates 2 and 3, the rear end of member 43 thereby contacting tail 16a to pivot blade 16 for severing the loop e held thereon.