Patent GB-1088377-A (GB)
Title: Improvements in or relating to a method for unweaving with a travelling wave-shedding loom and to an improved loom for performing the method
IPC: D03D47/26
Filed: 1964-10-14
Abstract: 1088,377. Unweaving in travelling wave-shedding looms. VERWALTUNGSGESELLSCHAFT DER WERK-ZEUGMASCHINEN-FABRIK OERLIKON. Oct. 14, 1964 [Oct. 14, 1963], No. 42012/64. Heading D1E. A travelling wave shedding loom has means for unweaving that causes the shedding mechanism to run in reverse in a series of spaced steps whilst allowing normal travel of the shuttles. In Fig. 12 the loom is stopped upon fault with eight shuttles 33 1 -33 8  in their respective sheds numbered 1-8. Upon unweaving the eight shuttles travel on with their respective shads opening and closing before and after them but the ninth shuttle, without laying weft, travels with shed 8 opening in front of but not closing behind it so that an open shed for shuttle 33  is effective across the whole fabric width and the weft from shuttle 33 may then be removed. The weftless tenth shuttle then similarly travels through the shed previously opened for shuttle 33 7  so that the weft laid by shuttle 33 7  may be removed. This process is repeated 11 to 6, 12 to 5 land so on until the defective weft is removed. Shedding mechanism. In Fig. 1 gears 12-16 rotate continuously and cooperate with mutilated gears 1-5, if such a gear is partly rotated. The gears 1-5 are mounted on shaft 6 to 10, each shaft 6-10 having cam-gears 23, 22. If the cam gear 23 of gear 1, shaft 6 is partly rotated the gear 1 will be entrained by gear 12 and rotated for one revolution and, in so doing, cam gear 22 of shaft 6 will pass its motion, with time delay, so that gear 2 is rotated one revolution. In this way each mutilated gear is successively rotated and the rotation of each gear may operate inter alia, a heald frame across the width of a wave-shedding loom. Eight such gears may operate for the eight sheds of Fig. 12 and sets of such mechanisms may operate banks of heald frames, each bank shedding for its related shuttle. These gear sets may also be used as a pattern mechanism. In Fig. 7 (not shown) eight mutilated gears and related cam gears are circularly arranged as units (26) so that the motion travels continuously around and may be taken off to actuate a heald (32). Each of the units (26) may actuate a heald and more than one motion may simultaneously travel around the units (26). Fig. 9 shows the arrangement of shedding mechanism for Fig. 12. The heald frames for one shuttle are shown as a bank 36 of eight frames 32 8 -32 1  which are operated successively by the mutilated gears. The impulse to operate the bank 36 comes from a circularly disposed set of units 26 and is taken off a mutilated gear at 29. Each unit 26 may operate a similar bank 36 and more than one pulse may travel around the units 26. In normal weaving the pulses travel across the banks 36 and the healds 32 8 -32 1  relating to shuttler 1 to 8, are successively shed. Upon fault a reversing unit 37 operates to allow the healds of a bank 36 to be successively shed, but not closed behind a shuttle and, at the same time, reverses the direction of the pulse around the units 26 so that 8 is shed for 9, 10 for 7, 11, for 6 and so on.