GB807271A - Improvements in or relating to shuttleless looms - Google Patents

Abstract

807,271. Shuttleless looms; weaving fabrics folded. DUERKOPPWERKE A. G. Sept 1, 1955 [Sept 2, 1954], No 25085/55. Class 142(2) Fabric is woven folded in two by inserting a loop of weft into one layer of the fabric, then drawing one limb of the loop out of that layer and into the other layer; loops from separate weft packages are inserted into the upper and lower layers alternately, each weft being cut after two insertions, whereby selvedges are produced as in Fig. 7 (which shows the fabric opened out flat). Weft inserters Figs. 8 and 10. Needles 8, 9 each have a horizontal notch 13 in the end, and a hook 14 on front, across which projects a loop 15 of rubber. The needles are guided by rollers 12 and are fixed in a block 4 pivoted to the periphery of a gear 5; the block also carries needles 10, 11 of an adjacent weaving mechanism. Reciprocation of the needles is effected by a crank, which causes the gear 5 to roll round an internally-toothed gear 6. Weft, supplying, Fig. 14. Presentation of the weft threads to the needles is effected by clamps 52, 52<SP>1</SP>, mounted on separate toothed rings 49, which are partially rotated one way or the other, by means of toothed sectors oscillated by Geneva mechanisms, to bring the weft threads 43<SP>1</SP>, 47<SP>1</SP> into or out of the path of the needles 8, 9; each clamp can be closed by moving a semicircular yoke (not shown) to a position concentric with the ring 49, whereby the outer jaw of the clamp is pressed against the inner jaw and kept against it as the clamp rotates with the ring 49. Picking sequence, Figs. 12 and 14. The weft thread 43<SP>1</SP> is held across the path of the needle 8 by the clamp 52, as shown, so that when the needles enter the shed, the notch in the needle 8 pushes a loop of weft from the bobbin 43 into the upper shed; when the needles emerge from the other side of the sheds, a spreader 46, Fig. 12, passes downward through recesses 16, Fig. 10, in the needles to take one limb of the weft loop from the upper needle 8 to the lower needle 9, where it snaps into the hook 14. As the needles retract, the clamp 52 opens to allow the lower needle 9. to draw the 'free limb of the weft through the lower shed. After beat-up, the weft 43<SP>1</SP> , which now extends from the bobbin 43 to the fell F, is lifted clear of the needle 8 by the open clamp 52 and the weft 47<SP>1</SP> is aligned with the notch of the needle 9 by the clamp 52<SP>1</SP>; the needles then insert a loop of weft into the lower shed and draw one limb of it into the upper shed. The above sequence of picks is repeated, with the difference that both wefts are now anchored in the fabric, the free ends necessary to enable one limb of each loop to be transferred to the other shed being produced by the clamps 52, 52<SP>1</SP> cutting the threads near to the bobbins 43, 47.