Patent GB-288254-A (GB)
Title: Improvements in knotting devices, particularly for connecting the ends of the threads of two warps
IPC: D03J1/16
Filed: 1928-03-02
Abstract: 288,254. Zellweger Akt.-Ges. April 7, 1927, [Convention date]. Knot-tying devices. - A device particularly applicable for connecting with each other the ends of the threads of two warps has a hollow spindle about which a thread manipulator moves in a circumferential and axial manner to form two loops, whereupon a knotting needle sliding within the spindle pulls the second loop through the first to make the knot. Two beds 1, 2 are provided with bars 1<1>, 2<1> for clamping the threads a of the old warp and the threads b of the new warps and along both beds a carriage 3 carrying the knotting device A is movable on rollers under the influence of worms 4 working on racks. The knotting apparatus is driven from a pulley 5 which turns a shaft 7 to rotate a pair of parallel shafts 14, and an inclined shaft 97. One shaft 14 drives two thread separating spindles 19, 19<1> co-operating with the warp a and the other drives two similar spindles 22, 22<1> cooperating with the warp b. The spindles have a link 25 arranged in front of a flattened portion and co-operate with members 26 provided with bristles 27 and given a circular motion by links driven by the shafts 14, to separate one thread after another from the warps ready for the knotting together. The threads separated from the warps bear respectively on feeler arms 33, 34 and keep the hooks 35, 36 out of the path of a lever 38 periodically swung about its pivot 39 by a cam disc 40 on the shaft 14. If the separating mechanism has failed to separate a thread from each warp, one of the arms 33, 34 has a free path and a light spring pulls the corresponding hook into the path of the lever 38 which, on swinging, lifts the frame 41 and tilts the lever which pulls a cord 51 to rock a lever 52, Fig. 4, to release the clutch 8 coupling the main driving pulley 5 with the main shaft 7, putting the knotting mechanism out of action. The missing thread is separated by hand and the clutch moved to operative position by the hand lever 53. As each pair of threads is separated, a roller 61 on the short arm of a lever 59 pivoted at 58, rolls round a cam 56 on the shaft 7 to swing the long arm of the lever, carrying a thread clamp 62 and thread clamping and cutting means, 80, 72, into engagement with the threads, as shown by the broken !lines in Fig. 3. A rod 66, reciprocated in a hollow bearing on the lever 59 by a second cam 57 on the shaft 7, closes the cutters 72 and clamp 80 by reciprocating a plate 69, Fig. 11, with an inclined guide slot 70 for operating the cutters and an inclined edge 71 for closing the clamp. The ends of the cut threads are then engaged by the clamps 81 of a transfer member 82, Fig. 9, rotated from the shaft 14, and placed across the fork 87 and clamp 88 of the knotting device. This clamping device holds the threads between a fixed lever and a spring-pressed lever with a cutting lever 91 arranged behind, the clamping lever and cutting lever being opened and closed periodically by levers 92, 101 respectively operated by eccentrics 99, 95 on a shaft 94 rotated by bevel gears and shaft 97 and 10 from the shaft 7. In this position, the threads lie tangentially to a sleeve 102 which carries thread manipulating member 119 rotating with the sleeve, but slidable in relation thereto. After the cutting lever 91 and clamp 88 have closed and opened, a lever 108 swings horizontally about its pivot 107 by the roller 109 working in an inclined groove in the eccentric 110 on the shaft 94, causing a toothed arc 108<1> to rotate the sleeve 102 by engaging the toothed arc 111<1> thereon. The thread manipulator 119 then rotates round the axis of the sleeve, gripping the cut threads and making the first loop c, Fig. 26. As the arm 108 swings, it also moves a plate 117 with a slot 117<1> engaging a roller 115<1> on a lever 115 pivoted at 116 and engaging a groove 114 in the thread manipulator 119, causing this member to rise and fall as it rotates. This vertical movement causes the manipulator 119 to lay the second loop d across the top of the sleeve 102, Fig. 26. The barbed knotting needle 103 is then pulled down by a lever 104 actuated by a roller engaging a side groove in the eccentric 95, to pull the second loop through the first and make the knot, a clamp 125 rotated by gears from the shaft 94 then catching up the knotted thread and transferring it.