Patent GB-488716-A (GB)
Title: Improvements in shedding mechanism for looms
IPC: D03D37/00
Filed: 1937-01-13
Abstract: 488,716. Loom shedding-mechanism. JABOULEY, J. Jan. 13, 1937, No. 1045. [Classes 142 (i), 142 (ii), and 142 (iv)] In weaving fabrics with interlocked threads, a weft 50, Fig. 10, is inserted between an intermediate warp thread 33 and two other warp threads 32 which lie in another warp sheet and at the two sides of the intermediate thread, and before the passage of another weft the threads 32 are transposed as shown. The three threads may belong to a larger group comprising intermediate threads 33 and crossing threads 32 each passing over and under single weft threads. The fabric may be cut warp wise between two such groups of threads and thus a wide fabric be cut into lesser widths for making ties &c., or a tubular fabric woven on a circular loom may be cut into a single piece with secure selvedges or into two or more pieces. The threads 32 may be crossed, when the threads 33 have been shedded away therefrom by twisters 23, 24, Figs. 1, 2 and 4 operating independently to produce ribs or other pattern effects, or two or more twisters may be disposed side by side or overlapping one another to produce complicated pattern effects &c. Two twisters or sets of twisters may be disposed adjacent to each other without intervening warp threads, so as to produce an open work effect. Circular looms, leno shedding-mechanism. The invention is shown applied to a circular loom wherein of the main warp threads 2 alternate ones pass through the eyes 16 of the dents of a reed 13 carried by a spider 14 outstanding from the central shaft 9, shedding wheels 11, 12 acting on the other main warp threads to form sheds to receive the shuttles 49, as shown in Fig. 2. The wheels 11, 12 are carried around the loom at the same speed as the shuttles by a driven spider 18 &c. To manipulate fourteen warp threads 32, 33 to produce an interlocked selvedge at any point around the loom, several dents 15. are removed from the reed at this point, and the intermediate threads 33 are passed through a slotted guide 35 on a twister 21 secured to the spider, whilst the crossing threads 32 are passed through four tubes 24, Figs. 2 and 4, each provided with two arms 23 having guides 25. Two threads pass through each tube and one through each guide, the tubes carry interengaging pinions, one of which is engaged by a toothed quadrant on a forked lever 31, operated by a rod 40 on a hollow pillar 39 on a spindle 38 on a plate 37 on the spider 14. A rod 42 on the pillar is rocked first in one direction and then in the other by catches 43, Figs. 1, 2 and 6, yieldably mounted on arms 10 on the spider. The movement of the rod 40 is limited by stop screws 44, the catches 43 thereafter yielding, and the pillar 39 is acted upon by a spring locking device after an outer shedding wheel 12 has moved the intermediate threads 33 inwards, so that the threads 32, 33 are in inner and outer sheets with respect to one another, a pick of weft 50, Fig. 10, is inserted, the threads 33 are next pushed outwardly between the arms 23 by a shedding wheel and a shed is formed in which the threads 32, 33 are now in outer and inner sheets with respect to one another, the tubes being twisted to transpose the threads 33 from positions A, B, C, D, Fig. 11, to positions A<1>, B<1>, C<1>, D<1>. A weft 53 is then inserted. The threads 33 are then moved inwardly, a weft 55 is inserted, the threads 33 are moved outwardly the threads 32 transposed to their original positions, a weft 56 is inserted and so on. A twisting unit having three arms and the fabric produced thereby are described. The intermediate threads may be shed by healds so as to move in one direction only, namely inwards, the twisters being themselves moved radially inwards at times. The twisting threads 32 are supplied by a separate package 57 mounted on the spider 14 and braked by a band and weight device. The selvedge may comprise threads differing from the remaining threads. The Provisional Specification refers to an arrangement of two twisters with two intermediate threads only, which lie adjacent to the outermost arms of the twisters.