Patent GB-412938-A (GB)
Title: Improvements in shuttleless looms and thread measuring and cutting mechanism therefor
IPC: D03D47/24
Filed: 1932-12-31
Abstract: 412,938. Looms with stationary weft supplies. BRITISH CELANESE, Ltd., 22, Hanover Square, London, and POOL, W., c/o British Celanese, Ltd., Spondon, near Derby. Dec. 31, 1932, No. 37008. [Class 142 (ii).] In weft measuring apparatus for a shuttleless loom, a single movable trapper 38 shown in plan view in Fig. 2, carries the weft 28 across the path of drawing means such as pegs 27 extending unequal distances from an endless driving chain 25, cutting means 64 arranged at some distance past the trapping means severing the loops drawn from the weft supply and furnishing limbs of unequal length. The chain may draw a loop sufficient for either one or two picks. The weft from the supply passes over a guide disc through two guides 35, 36 and is drawn by the pegs 27 alternately into loops on opposite sides of a guide peg 66, The weft can be engaged by a stationary trapper 37, the lower jaw of which is carried by a shaft 61 rocked by cam-controlled lever mechanism, or by the movable trapper 38, which is actuated by cam-controlled lever mechanism and may occupy a position close to the fabric selvedge or may move to grip the thread close to the guide 36. A depressor 63 actuated by a rod carried by the lay moves the thread 28 into engagement with a dummy shuttle 67 when necessary. When the trapper 38 moves outwardly, pegs 53, 54 on a quadrant 54 engage an L-shaped member, which acts on a spring-loaded plunger to open the trapper jaws, the member moving idly on the return movement of the trapper. The pegs 27 are mounted on plates 73, Fig. 5, pivoted to the chain at 74 and provided with pins 75, 76, which are engaged by teeth on a release member 68, furnished with a spring 72, the pegs being thereby inverted to release their loops. The pegs are reset in position by means of a toothed resetting member. When forming a loop sufficient for one pick, the thread 28, Fig. 8, extending through the guide 36 to the trapper 38 is first drawn into a loop to the left of the peg 66 and is inserted by the dummy shuttle, the weft having been engaged by the fixed trapper and released from the trapper 38 as shown in Fig. 9. The insertion of the weft draws this into the trapper 38 again, a fresh loop is drawn to the right of the peg 66, as shown in Fig. 11, and inserted by the shuttle,' the right hand limb being severed by the cutter 64 at a distance from the fixed trapper 37, which grips the weft. The trapper 38 now swings round, grips the weft near the guide 36 as shown in Fig. 12, and then returns carrying it to a position near the selvedge. The cutting occurs on alternate loops, the picks being inserted in pairs connected at the fabric edge. As the cutting occurs at some distance along the limb which is cut, the second of a pair of connected loops is shorter than the first, but together with the length extending from the edge of the fabric after insertion of the first loop is sufficient for the second pick. When drawing loops sufficient for two picks, guide means 85 are provided and the loop which extends as shown in Fig. 14 from the movable trapper 38 around pairs of pegs 81 on the drawing chain 25 to a guide 80, is retained by a movable finger 86. The left limb of the loop is depressed by a deflector 84 and inserted by the ' shuttle.' The trapper having meanwhile opened is swung by the turning of its carrying rod 82 into a position near the guide 80 where it seizes the thread and carries this across the chain 25 between the jaws of the cutter 83. These close and the remaining limb of the loop is inserted as shown in Fig. 17. The tail of weft left between the cutter 83 and trapper 38 furnishes an extra length of weft for the first pick to compensate for the length extending from the finger 86 to the selvedge and forming part of the second pick. The severance may be effected at an adjustable distance from the movable trapper. Similar weft measuring devices may be used at each side of the fabric acting alternately and compensated draw off means as described in Specification 372,372 may be used. The apparatus may be used in looms with stationary shuttle boxes as described in Specification 404,312 and may be used in looms having several wefts for patterning or weft mixing as described in Specification 412,612. Specifications 346,850 and 372,374 also are referred to. According to the Provisional Specification, loop length adjustment may be effected by drawing a subsidiary loop within the main loop as described in Specification 362,979 or by means of a finger which is caused to enter the loop near the line of the lay at beat up and the cutting device may be near the line of movement of the trapping device. The point of release of the loop may be adjusted as described in Specification 412,937.