Patent GB-1139514-A (GB)
Title: Tying mechanism
Inventor: BANKS CHARLES T
IPC: A61F13/20
Filed: 1966-01-12
Abstract: 1,139,514. Knotting apparatus. KIMBERLY-CLARK CORP. 12 Jan., 1966, No. 1475/66. Heading D1C. Apparatus is provided for knotting together the ends of a loop of string drawn through a tampon 25, Fig. 1, by a hooked needle 30 and comprises a flyer 22 which after the loop has been drawn moves the end of the string connected to the supply into a position in which it is secured by a shuttle 20 which already secures the free end of the string, the ends of the loop thereby being positioned and extending across the gripping tips 82, 72, Fig. 4, of a knotter bill 21. The ends also extend across the notch of a cutter 23 which after the ends of the loop have been gripped by the knotter bill 21 severs the ends between the bill and shuttle whereupon the bill completes its movement and ties a knot. The knotted end of the loop is passed through the loop, and drawn tight by mechanism described for example, in U.S.A. Specification 3131435. The flyer 22, knotter bill 21, cutter 23 and shuttle 20 are operated in timed sequence from a main drive shaft 24 which has on it a barrel cam 35 provided with a groove 36 in which engages a roller 37 coupled to a lever 38 operating a quadrant 41 geared to a lever 45 to which is secured the flyer 22 Fig. 17. Rotation of the drive shaft 24 therefore causes the flyer to oscillate and feed the strung to the shuttle 20. In timed relation with this movement of the flyer, a roller 59 on a disc 57; Fig. 7, engages grooves 53 on a barrel cam 52 on a shaft 50 driving the shuttle 20, Fig. 5, to cause it to grip the string between upstanding lugs 48 and a brake 102a Fig. 15, to secure the ends of the loop. A stop mechanism for preventing undesirable rotation of the shuttle is provided by causing the disc 57 to engage slots 56 in a cam 54 secured to the shaft 50 there being a recess 60 in the disc 57 at the position where movement of the shaft is effected by the roller 59. In similar manner a barrel cam 68 is secured to the shaft 65 on which the knotter bill 21 is mounted, Fig. 4, and is operated to effect rotation of the shaft 65 by a roller 86 engaging in the grooves 69 of the cam 68, the roller 86 being attached to a lever 84 secured to the shaft 24 Fig. 8. A disc 7 serves to provide a stop mechanism to prevent unnecessary rotation of the shaft 65 and which engages a groove 70 in the barrel cam 68. The centre of the shaft 65 houses a second shaft 71 which rotates with the shaft 65 but is capable by means of a cam 79 and roller 82 of axial movement relative thereto. The lower ends of the shafts 71, 65 carry the gripping tips 72, 62 of the knotting bill and thereby their relative axial movement and simultaneous rotary movement causes the gripping tips to open and close and grip the string ends. The cutter 23 is operated from a cam 100 on the end of the shaft 24, Figs. 1 and 2, and comprises fixed and movable blades 90, 91 the latter being operated in timed relationship to the rest of the mechanism by a follower in the cam 100 operating a lever 98 controlling the movable blade. The yarn from the supply extends through the flyer past a pin 108 and string guide support 109 to the shuttle 20 as illustrated in Fig. 15. The tampon 25, in a holder 27 of a turret 28, is rotated into position whereupon the needle 30 is raised to penetrate the end of the tampon and rises sufficiently to extend between the pin 108 and string guide support 109 to engage the string. The downward movement of the needle shows a loop through the tampon whereafter the flyer is swung to feed the supply end of the string to the shuttle and feed it across the knotter bill and cutter whereafter the knot is tied and the ends reversed.