Patent GB-412937-A (GB)
Title: Improvements in thread-supplying mechanism for looms with stationary weft supplies
IPC: D03D47/24
Filed: 1932-12-31
Abstract: 412,937. 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. 37007. [Class 142 (ii).] In shuttleless looms in which the weft is drawn into loops prior to insertion, a plurality of weft-trapping devices and weft drawing means are provided for drawing the weft into successive pairs of loops that are released in turn when there is substantially a pick length in the loop, the weft being severed from the supply after the formation of each pair of loops. The trapping means comprises a disc 36, Fig. 6, preferably rotated intermittently as described in Specification 372,373 and having trapping devices A, B. Each trapping device comprises a cam-released spring-controlled plunger 40 movable in a sleeve 39 and adapted to grip the weft between the sleeve and a fibre pad 41 engaged by a rubber washer 42 held by a clip to the end of the plunger. The upper ends of the plungers engage a cam formed of two concentric tracks 52, 53 having means whereby they may be adjusted to vary their combined length. The device A serves also to sever the weft and retain its grip on the weft leading to the supply while releasing the other cut end forming part of a loop. The plunger 39 of the device A is notched to form a cutter with the sleeve and is held in contact with the sleeve by a spring 57. When the plunger moves upwardly under the action of a spring 46, the weft is severed, one end being held between the pad 41 and the sleeve, while the other end is released through a gap in the pad. Instead of the weft being out at the trapping-means, it may be cut at some distance therefrom as described in Specification 372,374. The trapping means operates in conjunction with pivoted carriers 70, 71, Fig. 9, moved across the disc 36 by a chain 19. In operation, weft passing through a guide 78 from the supply is held by the trapper to the right, the trapper to the left being open. The carrier 70 then draws a loop a, b, the trapper to the left closes simultaneously with the opening of the other trapper and with the release of the loop by the tilting of the carrier 70. A guide 100 ensures that the limb b is in the path of a depressor 80 which moves the limb into the path of a hook on the dummy shuttle. The disc rotates through 180‹ and the second loop c, d, connected to the first, is drawn by the carrier 71, the limb c being in the path of the depressor 80. The trapper to the right is then opened, the loop is released from the carrier 71, and the trapper to the left is closed, thus severing and freeing the limb d from the supply while retaining its grip on the supply weft. The loop c, d is then picked, and the series of operations is repeated. The release of the loop c, d may be delayed to produce a slight tension and thereby ensure a clean cutting action of the trapper A. The weft measuring apparatus is applied to each side of the loom. The width of fabric woven may be varied by moving the apparatus and adjusting the chain. Distance pieces as described in Specification 412,612 may be employed. The chain 19 is driven by chain and sprocket gearing from the crankshaft and can be rendered inoperative for turning the loom back. Specification 346,850 also is referred to. The Provisional Specification refers also to the use of the devices described in Specifications 362,979, 372,372, 372,375, and 412,938.