Patent GB-916300-A (GB)
Title: Improvements in or relating to knotter mechanism for hay or like balers
IPC: B65B13/26
Filed: 1961-11-08
Abstract: 916,300. Knot-tying devices. INTERNATIONAL HARVESTER CO. Nov. 8, 1961 [April 17, 1961], No. 39963/61. Class 112. A tying bill 22 in a knot-tying device comprises a first jaw 58 projecting substantially at right-angles from a rotary shank 33 and having a heel portion 48 adjacent the shank, a toe portion 60 remote from the shank, and a slot 61 extending from a position adjacent the toe portion to and through the heel portion; and a second jaw 46 pivoted at 47 within the slot at the heel portion and adapted to swing down over the top of the toe portion, the underside of the second jaw co-operating with the slot to grip the strands being tied togeteher while the knot is formed. A strand-receiving crotch 59 is formed at the junction of shank 33 and jaw 58. Toe 60 is formed with a flat-bottomed groove 62 having chamfered sides 63 and 64. The upper edges of slot 61 are chamfered as at 65 and 66. The underside of jaw 46 is formed with a chisel edge 68. Jaw 46 is also formed with a beak 70 which is narrower than groove 62 and has a flat under-surface which engages the flat bottom of the latter. Jaw 58 has a curved trailing edge 72, and increases progressively from a width w<1> at the toe to a width w at the shank, then progressively decreases in width around the heel. The proportions of jaw 58 are such that where l=the distance from the toe to the shank, w=<2>/3 l and w<1>=<1>/3 l. The knotting bill is incorporated in apparatus adapted to tie together the ends 15a, 17a of a strand 14 of twine encircling a bale 11 of hay formed in a baling press. A frame 23 journals a driven shaft 25 which carries a wheel 26 formed with concentric bevel sectors 27 and 28. Sector 27 meshes with a gear 29 to rotate a shaft 40 carrying a strand-end holder 19. Sector 28 meshes with a gear 32 to rotate the shank 33 of the bill 22. Holder 19 comprises a pair of spaced-apart discs 19a, 19b and an intermediate strand-clamping member 19c pivoted at 38 to the frame 23. Discs 19a, 19b are formed with adjacent notches 20, 21 and also with diametrically opposed adjacent notches 54, 55, the notches 20 and 54 being deeper than the notches 21 and 55. Initially, the end 15a is stretched between a fixed finger 37 and the notches 20, where it is held by the member 19c, to lie within the crotch 59a of the bill 22. An arm 16, carrying a continuous supply of twine, then swings in to lay the other end 17a in the crotch 59, end 17a being stretched between finger 37 and the notches 21 where it is also held by the member 19c. Shaft 25 then rotates, when bill 22 operates in the conventional manner, jaw 46 being opened and closed by the co-operation of a roller 50 thereon with a cam track 51 in frame 23, and the notches 20, 21 move to their lowermost position adjacent a blade 41. The latter is fixed at one end, is formed intermediately with a notch 44, and is formed at its other end with a knife 45 so positioned as to clear end 15a in the deep notches 20 but to sever end 17a in the shallow notches 21. The farther continuation 53 of end 17a has meanwhile been laid in the deep notches 54, which thereby constitute the notches 20 for the subsequent knotting operation. Arm 16 swings away, and the ejection of the bale from the press serves to strip the knot from bill 22 by opening jaw 46 against the resistance of a cam 74 biased by a spring 73. U.S.A. re-issue Specification 262,883 is referred to.