GB372374A - Improvements in or relating to looms having stationary weft supplies - Google Patents

Abstract

372,374. Looms with stationary weft supplies. BRITISH CELANESE, Ltd., 22, Hanover Square, London, and POOL, W., of British Celanese, Spondon, near Derby. Feb. 6, 1931, No. 3896. [Class 142 (ii).] Relates to looms in which weft is drawn in loop form between weft trapping devices at the sides of the loom, the limbs of the loop being inserted by a dummy shuttle in separate sheds to form a hairpin, and the bight of the loop forming the selvage. A longer length of weft must be available for the first pick of each loop, and in order that different lengths may be available on the two picks, while allowing loops of substantially equal limbs to be drawn, the cutting means are arranged to sever the limb of the loop connected to the weft supply at some distance from the trapping device on the side remote from the supply. Fig. 8 shows trapping devices 21 for supplying weft to both sides of the loom. The weft loop at the left has been drawn by the travelling member 14 and the limb 43 released from the jaws of the trapping device and ready to be picked by the shuttle 44. After it has been picked, it will extend around the guide finger 38, the part between the selvage and the finger forming part of the second limb, which is provided with a correct length by arranging the cutter 28, 29 for severing the weft from the supply 42 at a distance, as shown, from the trapping device. The travelling members 14 for drawing the loops between the trapping devices are mounted on an endless chain and move the weft into position for severing, to a depresser by which it is presented to the shuttle, and to the loopretaining finger. Guides are provided to prevent the weft from fouling, while a guide roller at a bend of the chain is provided with a cover-plate and guard for the same purpose. The chain is guided further in a tunnel near the finger 38 to present the member 14 accurately. The cutter, which operates simultaneously with the raising of the finger 38 to release the limb for the second pick, comprises fixed and movable jaws 29, 28, Figs. 5 and 7, the movable jaw having a beak 49 for preventing entry of a wrong part 48 of the weft between the jaws, while the weft to be severed is led through a notched plate 47. The movable jaw is operated to close quickly through lever and cam mechanism geared to the chain. Specifications 346,850, 362,979, 372,373, and 372,375 are referred to.