Patent GB-191020983-A (GB)
Title: Improvements in Power Looms for the Manufacture of Oriental, Persian, Wound and other Knot-stitch Carpets.
Inventor: RENARD CHARLES
IPC: D03D39/02
Filed: 1910-09-08
Granted: 1911-09-08
Abstract: 20,983. Renard, C., and Renard, A. Sept. 8. Pile-fabric looms.-Relates to the looms for weaving Oriental, Persian, wound, and other knot-stitch carpets described in Specifications 15,901 /06 and 16,009/09, and comprises improvements in the construction and arrangements of the looping-devices, the pile-cutting devices, the pile-distributing devices, and the pile - gripping devices. Each looping - device comprises two tubes 1, 2, Figs. 1, 2, and 3, arranged parallel, as shown in plan in Fig. 2, or convergent, and each closed at one end by a plug 3 provided with a guide-tube 4, in which moves the stem 7 of a hook 6. The pile yarns are gripped between the hooks 6 and sheaths 5 on the tubes, which have retaining-shoulders 8 for holding the two warp threads during the knotting operation. The stems 7 are secured by bolts 12 to tubes 9, 10 provided with projections 14 fitting within slots in the tubes 1, 2, so that the tubes 1, 2 and 9, 10 rotate together, but are separately movable axially. The two tubes 1, 2 may be geared together, or they may be separately rotated, and they are guided by a guide 16 and by a guide 17 secured to a carriage 53, 55, which is movable between the projections 46, 49 of small frames 45, 46, 49 secured to bars 59, 60, 61 and provided with plates 52. The tubes 9, 10 are guided by open bearings 25 in the side 22 of a small carriage 22, 24 movable within recesses in the large carriage, the stems 7 passing through the carriage side 24. Springs are interposed between the carriage side 22 and the tubes 9, 10. A pin 38 on the carriage side 22 fits within the slot in a rod 31, 32 connected to a wheel 39 geared to a rack 42, which actuates all the looping-devices. When the wheel 39 and rod 31, 32 are actuated to close the grippers, a curved crank-rod 26, 27, which is connected to a part 41 oscillating on a shaft 57, is rocked until the rod 26, 27 meets the shaft, and, as the rod end 27 has then passed beyond the shaft 57. a locking effect results. On the return movement of the rod 31, 32, a spring 43 connecting it to the small carriage is stretched, but the grippers remain closed. When the looping- devices are rocked to lock the stitch, the resistance of the pile thread seized by the grippers causes a sliding movement of the large carriage against the action of a spring 51, 58, whereupon a screw 28 on the part 41 meets a projection 30 and the part 41 is rocked, thereby causing the grippers to be opened suddenly by the stressed spring. If the grippers have failed to seize their pile thread, they are nevertheless opened when the rod 31, 32 completes its return movement by the engagement of a projection 44 on the rod with a stop 29 on the part 41. A modified arrangement for effecting the closing and sudden opening of the grippers is described, wherein a slide provided with pins for actuating lever mechanism is used. Modified arrangements of the hooks 6 and sheaths 5 are shown in Fig. 8. As the large carriages 53, 55, Figs. 2 and 3, occupy only half the width or thickness of the frames 45, 46, 49, each of these frames may be used to guide contiguous carriages, thus increasing the number of looping-devices possible in a certain space. The bars 59, 60, 61, Figs. 3 and 5, are secured at each end to frames 62, 89, 63 carried by trunnions 121 on the square shaft 60, about which the looping-devices can thus rock up and down in the direction of the arcs 125, 126 and 127, 128. The looping-devices are suspended at each end on a lever 130 on a shaft 122, about which they can therefore also rock in the direction of the warp in the arc 123, 124. Each pile cutter 77, Fig. 2, is secured to a bar 78, 83 actuated by a lever 81, all the levers 81 being actuated by a cam-and-lever controlled plate. The cutter 77 abuts against a sheath 76 provided with a hollow part within which the cutter slides and fixed upon a hinge, one blade 86 of which is secured to the bar 59. The sheath 76 and cutter can thus be raised, if necessary, during the cutting operation. The pile-distributing blades 91, Fig. 11, may have spring-controlled V-shaped guides 93, the pile thread being tensioned by passing between the guide and the lower part of the blade, or, as shown, one or more pivoted pieces 99 may be used, so that each blade can distribute several threads. Blades provided with fixed guides and springs are described, wherein each blade is used to distribute several threads. The pilegripping devices or distributing-grippers are so arranged that their actuating-mechanism may be placed at some distance from their gripping- jaws. They may comprise inner and outer tubes 106, 107, Fig 15, having straight, curved, or angular gripping-jaws 108, 109. The tubes are provided with levers 110, 111 having screws &c. 112, 113 actuated by two cam-controlled plates, which give to all the grippers the rotary movements necessary for opening and closing their jaws. The grippers are rocked to draw out the pile threads by means of rings 118 secured to bearings 117 on a shaft 116. Grippers having sliding or rocking movements, as shown in Figs. 19 and 22, may be used.