Patent GB-693485-A (GB)
Title: Improvements in or relating to looms and method of weaving
IPC: D03D47/00
Filed: 1949-08-05
Abstract: 693,485. Shuttleless looms. DRAPER CORPORATION Aug. 5, 1949 [Jan. 19, 1949], No. 20402/49. Classes 142(ii), 142(iii) and 142(iv) Each pick is inserted by pushing a loop of weft partway across the shed by means of one weft inserter, then transferring it to a second weft inserter, operating from the opposite end of the loom, which straightens out the loop ; the two limbs of the loop are in vertical alignment, the free end being disposed under the first weft inserter. Weft is inserted from both ends of the loom in pairs of connected picks (constituting " hairpins "), a complete cycle comprising two hairpins, one from each end, having their legs inserted in any order (i.e. one leg from each end alternately ; a complete hairpin from each end alternately ; or a complete hairpin from one end between the legs of a hairpin from the other end) ; alternatively, picks can be inserted from both ends simultaneously, each weft inserter transferring its weft to the other at the middle of the shed. Or weft can be inserted from one end only, a :selvedge being formed as in Specification 424,709. Operating weft inserters. Weft inserters as described in Specification 693,550 are ,operated by tapes wound on tape wheels oscillated by eccentrics through rack and pinion mechanisms. Guiding weft inserters, Fig. 12. Where it enters the shed, the tape 180 carrying a weft inserter runs on a synthetic resin strip 201 and under strips 202, 203. Both edges of the tape are also guided by rollers '206, 207, the latter being mounted in eccentric bushes 211 to provide lateral adjustment. Other rollers surround the tape wheel to hold the tape against its periphery. Presenting weft to weft inserters, Fig. 25. At each end of the loom, the weft passes through a clamp 247 (described below) and a movable eye 265, and is further manipulated by a clamp 318, a trap 335, a hook 284, and a cutter (described below); the co-operating jaws 327, 341, Fig. 10, of the clamp 318 and trap 335 are spring loaded. As shown in Fig. 25, the weft extending to the selvedge over the trap 335 is depressed by the hook 284 so as to be taken into the shed by the weft inserter 214 in the form of a loop; when the weft inserter has entered the shed, the hook releases the weft and the trap 335 opens (by moving to the right), whereupon the weft from the eye 265 passes between the open jaws of the clamp 318 straight to the weft inserter. When sufficient weft to reach across the fabric has been drawn from the supply, the clamp 318 closes and the weft is cut between the clamp and the fabric. For the next pick from the same end of the loom, the eye 265 moves to the left and the hook 284 depresses the weft between the eye 265 and the clamp 318 to produce a vertical stretch of weft in the path of the weft inserter; when sufficient weft has been drawn through the eye 265, the clamp 247 closes and the clamp 318 opens to allow the end to be drawn into the shed; the weft then runs over the trap 335, which closes, and the eye 265 returns to the position shown. Weft clamp, Fig. 13. The clamp 247 comprises a spring-loaded eye 281 which can be pressed, by a lever 272, against a conical plug 278. Cutting weft, Fig. 10. A blade 316 attached to the clamp member 318 slides between two fixed blades 314 to cut the weft at the side of the clamp nearer the fabric. The cutting edge 317 is located by a projection 328 permanently engaged between the blades 314. Creel frame arrangement, Fig. 23. Two weft packages 151 are supported by pegs 382 pivoted at 384, the packages being tied head to tail to permit replenishment without stopping the loom. Slay, Fig. 5. The warp threads rest on a glass rod 243 and on a tapered felt strip 245 disposed with its thinner edge at the back. The weft inserter tape 180 is tilted slightly more than the upper surface of the felt strip so that only the rear edge of the tape rides on the warp. The swords 156 are carried by levers 223, with which they have a tongue and groove connection 226, and are vertically adjustable by screws 229. Beat-up motion, Fig. 5. Beat-up is effected by a cam 106, at each end of the loom, shaped to give a dwell whilst the weft inserters are in the shed. Backward movement of the slay is effected by a conjugate cam 107 acting on the lever 223 through a lever 236 pivoted at 235, backlash being eliminated by spring loading 238. The followers 233, 237 are made of synthetic resin.