Patent GB-178821-A (GB)
Title: Improvements relating to the shuttle-actuating devices of weaving looms
IPC: D03D49/44
Filed: 1922-04-05
Abstract: 178,821. Lambert, E., Pernin, R., and Chevalier, P. April 20, 1921, [Convention date]. Picking-motions, shuttles; shuttle boxes; change-box motions.-In looms wherein two shuttle-holder arms 1, 2, Figs. 1 and 3, are caused to move towards and from each other, and the shuttle is transferred from one arm to the other when these meet at the centre of the shed, the shuttle holders 14 are provided with electromagnets so as to clutch and release the shuttle at the required times. The arms 1, 2 may be reciprocated from wheels 3, 4 by means of the crank- and-pinion and rack mechanism shown, which includes fixed racks 9, 10. The shuttle 22, Figs. 1 and 4, may have projections 31 to engage grooves 29 extending some distance within fixed rest-boxes 25, 26 arranged near the edges of the fabric, the projections abutting against the ends of the grooves, so that the shuttle comes to rest within one box or the other and does not accompany the holders throughout the whole of their travel. The rest-boxes are slotted to receive the uprights 28 of the holder-arms, which may be guided by bars 13. The shuttle 22 is provided with soft-iron ends 23, 24 for attraction by the cores of the electromagnets arranged within sockets 14 constituting the shuttle holders on the holder-arms 1, 2. These sockets are provided with recesses 32 to receive the projections 31, and the electromagnets are energized through conducting-wires 17, which are wound round the arms 1, 2 and may be guided by a device comprising a knee-piece 18 and levers 19, 20, 21. The conductors are connected to contacts 37, 38, 39, 40 and to a source of current 33, which is connected to a contact 35, a rotating contact 34 causing the electromagnets in the respective sockets to be excited at the correct times. To obviate the effects due to remanence, a rotary reversible distributor, such as that shown in Fig. 9, may be used, whereby, immediately after the current has been cut off from an electromagnet, it is replaced for a very short period by a reverse current. To prevent accident in case of failure of current, mechanical shuttle holding or locking devices are used comprising spring- controlled hooks arranged in openings 43 in the sockets. These hooks mount ramped parts 46 on the shuttle and engage flanges 44, 45 thereon, but disengage easily therefrom when the shuttle has to pass from one of the arms 1, 2 to the other or has to stop in one of the boxes 25, 26. One hook is made stronger than the other. One of the rest-boxes (26), or both, may form part of a shuttle-distributor or revolving drum for changing the shuttle automatically or otherwise and thus changing the weft. Silencers may be arranged inside the sockets, or on " the polar pieces," or on the shuttle. In a modification, the shuttle remains engaged with one or the other holder during the whole, or practically the whole, of the movements of these holders. The shuttleholder arm 61, Fig. 10, is operated by a lever 60 connected to the axis of a roller 59 carried by a pinion 57 engaging a rack 58 and operated by lever mechanism 56, 52, 50 from a crank on a wheel 48. The shuttle-holder arm 63 is similarly operated. After the wheel 48 has turned about seven-eighths of a revolution, the roller 59 drops into a recess 62 and the pinion 57 stops rotating about its own axis and turns about the roller 59, the lever 60 and holder 61 remaining stationary during this movement. A somewhat modified current distributor 68 is used. A revolving drum shuttle-distributor or other device for changing the shuttle may be used, the shuttle being arranged to leave the shuttle-holder, to permit the rotation, and a current distributor of the type illustrated in Fig. 1 being used.