Patent GB-203368-A (GB)
Title: Improvements in and relating to method of and means for tying weavers knots
IPC: B65H69/04
Filed: 1922-05-08
Abstract: 203,368. Alexander, A. E., (Mill Devices Co.). May 8, 1922. Knot-tying devices. -In a machine for tying weavers knots, the threads are crossed at two separated points, one thread is looped around the other thread is looped around the other thread at one crossing, this loop is then twisted through 180‹ while a loop is formed in the second thread; finally the end of the second thread beyond the second crossing is threaded through both loops. Side-plates 10, 11, Figs 1 and 4, ,are secured apart by a lateral extension 12 of the plate 11 and by a U-shaped plate 16 secured between them. The bifurcated ends 91, 92, Figs. 4 and 5. of a spring-pressed trigger 86 pivoted to the plate 10 at 87, embrace the spiral stem 90 of the usual rotary tying-bill. A roll 101 on the end 91 of the lever 86 engages in a cam-slot' 99 in a cam plate 84 freely mounted on a shaft 56 journaled in the frame. Pivotally connected to the plate 84 bv a link 83 is a cutting and clamping lever 78 which is fulcrumed in and coacts with an auxiliary cutter 76, 77, Fig. 11, pivotally mounted on the shaft 56. A roll 98 on the other lever-end 91 engages in a cam slot 95 in a camplate 93 fixed to the shaft 56. to which is also fixed an arm 41. A thread-guide arm 39, Fig. 4, and a thread-engaging member 40 are pivoted to opposite ends of the arm 41. and have a pin-andslot connection 49, 50 at their other ends. The guide-arm 39 has a head 44 provided with guideslots 45, 46. An extension 51 of the member 40 coacts with a cam-plate 52, fixed to the plate 10. A lug 85 on the side-plate 10 limits the movement of the member 40. The tying-bill comprises cutting and clamping bills 29. Fig. 5, between which is pivoted a coacting jaw 31. The jaw 31 is actuated during rotation of the bill by an eccentric aperture 37 in the member 16 through which the tail of the said jaw passes. Integral with the side-plate 11 but. offset therefrom is a thread-guide head 61, Fig. 8, having thread slots 63, 65 and 64. A thread-engaging member 62, provided with fingers 66. 67 which cooperate with the slots 64, 65, is slidably mounted in a slot 70 in the side-plate 11 and has a pin- and-slot connection 68, 69, Fig. 1, therewith. An arm 74 fixed to the shaft 56 engages in a camslot 72 of the plate 62. Threads s<1>, s<2> are laid laterally in the guide slots 65. 45 and 64. 46 respectively, the thread s<1> being laid inside the tying bill, which primarily points vertically up. wards, Fig. 8. As the trigger is pulled, the members 39, 40 slide relatively to one another to cross the threads and the member 62 moves forward to position the threads at the other side as shown in Fig. 8. The first 180‹ of the revolution of the bill forms a loop in the thread s<1> 1 around the other thread. After the next 90‹ of rotation, the thread s<2> passes between the bill and its jaw 31, while the auxiliary cutter is raised bodily to operating position, Fig. 11, to seize the thread s<1>. During this time, the member 62 moves slightly forward to clamp the threads, the members 89, 40 finish their relative motion to clamp the thread s<2>, and are then moved bodily upwards, Fig. 11, by the cam plate 5<2> to tighten and strip the knot, the threads having been cut and clamped by the bill and the auxiliary cutter so as to leave equal thread-ends. Various modifications may be provided, for instance, the thread-guiding and holding means at either side of the machine may be similar, the threads may be crossed simultaneously, or separate stripping means may be provided.