Patent GB-228943-A (GB)
Title: Improvements in automatic looms for the mechanical production of genuine knotted carpets
IPC: D03D39/02
Filed: 1925-02-09
Abstract: 228,943. Vereenigde Knooptapijtindustrie Systeem Bßnyai Naamlooze Vennootschap. Feb. 8, 1924, [Convention date]. Pile-fabric looms.-In weaving by the process described in Specification 2742/14, carpets having multi-coloured pile threads knotted around warp threads 1, the pile threads are supplied by the eyes 19 of oscillating colour-selecting placers 17 and are engaged by oscillating drawing-out clamps 25, 25<1>, whilst swinging grippers 16 are rocked in such a manner as to pass between ground warp threads that have been raised by oscillating lifters 6 and then to seize the pile threads and draw them to such a position that the return of the ground warp threads to their original position suffices to produce a finished knot. The warp threads 1 pass through healds 2, thence in groups through a reed 3, the threads next being divided by an auxiliary reed 4 mounted on a shaft so that it may be turned out of the way when the shuttle inserts the ground weft. The lifters 6 mounted on a shaft 7 in a hollow part of the lay are each provided at the top with three spikes 34, 35, 36 forming a fork to take up and raise two warp threads, around which a thread is to be knotted. Each lifter has a tapering head 33 for guiding the warp threads and there are several lifters so that several knots may simultaneously be made. By means of jacquard-controlled devices 21, the position of the placers 17 is varied to place the required threads in position to be gripped by respective clamps 25, 25<1> mounted on shafts 24, 26 which are laterally displaced to draw out the threads to the required lengths. A shaft 9 carrying arms 10 supporting a rail 11 provided with spring-controlled grippers 16 is then moved in an anti-clockwise direction so as to cause the grippers to engage with the threads as shown in Fig. 2, the grippers being moved laterally at the required time by means of bolts 12 actuated by grooves in a control plate 14 on a shaft 13 carried by the arms 10, and being closed by means of a bar 15. The threads are then cut off by shear blades 29, which are lowered by means of a shaft 23 and are closed by means of rods operated from a shaft 32. The grippers 16 then return with these cut-off lengths, closing laterally and thereby knotting the threads around the raised warp threads. As the grippers 16 return to the beat-up position, a movable table plate 5 rises and follows the path of the spikes 16' of the grippers until the knots are set free. The knotting carriage and warp lifters are then shifted the breadth of two warp threads, and the knotting process is repeated until the entire series is knotted. The ground wefts are then inserted. According to the Specification as open to inspection under Sect. 91 (3) (a) the shafts for operating the knotting devices and the other weaving mechanism respectively are alternately operated from a continuously rotating shaft provided with two series of driving half toothed wheels or split wheel halves furnished with coaxial half discs or tappets co-operating with respective locking-discs on the driven shafts, and with gears thereon, so that when one shaft is being driven the other is locked in position and vice versa. The driving wheels may be made in three or four parts, and they are moved laterally by means of levers controlled by cam discs. This subject-matter does not appear in the Specification as accepted.