Patent GB-762297-A (GB)
Title: Process for the making of knots and machine for the working of this process
IPC: D02G3/42
Filed: 1954-02-26
Abstract: 762,297. Knot-tying. BRANCHU, P. J., CAUDMONT, A. E., PINARDEL, P., and WILLENICH, J. P. DE. Feb. 26, 1954 [Feb. 27, 1953], No. 5799/54. Class 112. To make knots on a thread, the thread is disposed in an undulating line, the undulations are rotated, to cross their legs and thus form loops axially aligned and disposed in parallel planes ; and one end of the thread is passed, in a single stroke, through all the loops, to pull each, in turn, through all the succeeding loops. In the arrangement of Figs. 1 and 2, an end of the yarn is tied to that end of the machine from which a carriage 5 is to be traversed. As the carriage is traversed along the machine, a bobbin 6 supplies the yarn, a grooved roller 7 lays it under hooks 11 and over ends 16 of levers 17 and a roller 8 rocks the levers, through fingers 9, to position 17a, about spindle 20, to form the yarn into undulations. The levers 17 are temporarily locked in this position by levers 25. A rack 15 is now operated to rotate the hooks 11 through 270‹, by means of pinions 14 on their stems, and so to form the bights of yarn held down by the hooks into loops, the levers 17 being, at the same time, lowered somewhat. Through recesses 11 in the hooks, and thus through the loops, is now passed a stem at least as long as the machine frame, that end of the yarn previously tied to the machine is now tied to the inserted end of the stem and the stem is withdrawn. As the yarn is thus dragged through the loops, each loop is, in turn, dragged off the nose 16 of its lever 17 (which nose is pivoted to the lever so that it can be deflected against spring action, to allow this) tightened into a knot and pulled through the loops still on their hooks. Rotation of a shaft 31 trips levers 25, to allow return of levers 17 to their initial positions under the influence of springs 21. In Fig. 1 each lever 17 comprises a part bearing the nose and pivoted at 20, and a tail part 22 also pivoted at 20 and formed with a nose 23 which bears on a lug 24 on the other part. The lever of Fig. 4 comprises, first a fore-part 17 pivoted at 20, extending under the nose 16 and connected to the finger 9 ; and, secondly, a part 33, also pivoted at 20, and bearing at one end a tail to be engaged by the lever 25 and, at the other, a spring 34 to which is attached the nose 16. In the arrangement of Figs. 7, 11 and 13, the yarn 57 is laid in forks 43, 43<SP>1</SP> and a frame 48 is lowered to bring the backs of members 44, of channel-shaped cross-section, to the right of the yarn (in Fig. 7). Levers 41 carrying the forks are now rocked, by an inclined plane 51 on a carriage 50, to swing the forks to the right (in Fig. 7) and so to form the yarn into undulations, Fig. 11, the levers being secured in that position by catches 55, 56. The members 44 are now all rocked through 270‹, by rotating their spindles 46 and, at the same time, raised somewhat. Thus, loops are formed around them, Fig. 13. A needle 58, is now passed through these loops, along the channels of the members 44 and pulls the free end 60 of the yarn back through the loops forming knots, as before. In the arrangement of Figs. 14, 16 and 20, the hooks are mounted on a frame movable vertically on guides 64, 64<SP>1</SP> by inclined planes on a reciprocating carriage 65, the frame 62 having pinions 71 mounted on a shaft 72 and running on racks 73, 73<SP>1</SP> on the guides 64, 64<SP>1</SP>. When the carriage 65 reaches the left hand end of its stroke a cam groove carried thereby acts through a roller 75, bell-cranked lever 76, link 78, rack 79, pinions 80 on the shafts of the end hooks to rotate all the hooks which are interconnected through cranks 82 and a connecting rod 81, the hooks being later returned to their initial position, by a spring 83. The carriage 65 is reciprocated through a chain 84 by a motor which is automatically stopped when the carriage reaches an end of its stroke. The levers .41 carrying the yarn receiving forks 43, 43<SP>1</SP> are rocked, at the proper time, against the action of return springs, by an inclined' plane 91 on the carriage 65, being held so rocked by latches 55, 56 until released by another inclined plane 96 on -the-carriage 65 when it reaches the end of its return stroke. The end of the yarn is held in a clip 110, 110<SP>1</SP> rockable about a spindle 111 on a carriage 104 traversed in one direction by an abutment on a chain 107 to carry the yarn across the machine, the clip being substantially upright. At the end of the stroke of carriage 104, a stop 125 tilts the clip into the full-line inclined position of Fig. 20, it being maintained in that position by a spring 114 abutting against a resilient stem 115. The needle 58, actuated by a flexible cable 98 (which meshes with and is driven, rack-like, by a toothed wheel in a casing 100) is pushed through the aligned hooks, at the proper time, pushes back the stem 115, allowing a spring 113 to bring the clip to a substantially horizontal position in which it allows the hook of the retiring needle to extract the yarn from it and return therewith it to form the knots. The carriage 104 is returned by an abutment 122 on a cable associated with the needle driving cable 98, this abutment, on its outward journey, springing past a spring- urged lever 116 and, on its return journey, abutting against it, to return the carriage 104.