Patent GB-428512-A (GB)
Title: Improvements in or relating to looms for weaving
IPC: D03D47/24
Filed: 1934-07-18
Abstract: 428,512. Shuttleless looms. TEFAG TEXTIL FINANZ AKT.-GES., 9, Z³rcherstrasse, Winterthur, Switzerland. July 18, 1934, No. 21009. Convention date, July 20, 1933. [Classes 142 (i) and 142 (ii)] - A loom for weaving comprises the combination with mechanism for picking shuttles of the gripper type in one direction through the shed, of conveyer means, e.g. an endless belt 28 whereby the shuttles are transported, outside the shed, back to the picking mechanism. The shuttles 90, of the gripper type and formed as in Specification 426,164 are picked from a stationary shuttle box 11 through the shed, being guided therein by a tunnel-like reed 8, by picking mechanism 13, 44 generally similar to that of Specification 361,230. After picking, the shuttles 90, received by a box 12 which may comprise a braking device as in Specification 406,527, are acted upon by a vertically movable wedge 36 to release the weft thread, and are then pressed downwardly to fall on to the conveyer belt 28 which transports them to the upper face of a vertically reciprocable plunger 30 whence they are returned to the picking position. The shedding mechanism, operated from cams 96 through bars 101 and bell cranks 102, to heald frames 10, is generally similar to that described in Specification 405,509. After insertion, the weft thread is held somewhat loosely by grippers 33, at each side of the loom, and a knife 168 effects severance. Each severed end is then bent in or selvedged into the next succeeding shed by mechanism 133, 134 similar to that described in Specification 408,818 and the turned-in ends are beat-up by the beat-up of the next weft thread. The warp from the let-off beam 25 passes over the breast beam 19, while the fabric, passing over the roll 18 is taken up by beam 20 driven from the beam 18 by a friction belt 63. Variable speed gear 164 drives the beams 18, 19 differentially so as to compensate for the natural shrinkage of the warp. The general frame construction of the loom and the operation of the swords 6 are substantially as described in Specification 401,605, while the operation of the slay 7 and the construction of the reed 8 may be as in Specification 413,850. The loom is driven from a motor through a clutch 21, the clutch being controlled manually by a rod 60 extending throughout the width of the loom. Movement of the rod 60 in one direction will set the main shaft 5 in motion, while movement in the opposite direction will declutch and through a system of levers &c. apply a brake band 82 to bring the loom speedily to rest. Automatic stop mechanism may be included to effect stoppage of the loom in the event of weft or warp breakage and the same may include a feeler as in Specification 406,160. In this event the operation of the feeler will energize a solenoid 88 to effect declutching and bring into operation members which will prevent the restarting of the machine until the broken thread has been rectified. The shuttle box 12 with the mechanism therein, may be adjustable to suit the width of the fabric being formed as in Specification 402,681. Horizontally reciprocable temples 150, similar to those of Specification 404,526, are provided for transversely stretching the fabric. The weft thread from supply is forwarded to the rear of each shuttle by a spring gripping device reciprocated by an arm 109, the grips being opened to release the thread after gripping by an oscillating arm 117.