Patent GB-189822703-A (GB)
Title: Improvements in Stop-motions for Looms, Warping Machines, and the like.
Inventor: THOMPSON WILLIAM PHILLIPS
Filed: 1898-10-28
Granted: 1898-12-23
Abstract: 22,703. Thompson, W. P., [Kip. F. E.]. Oct. 28. Loom stop-motions.-In looms provided with a weft stop-motion the weft-fork is fixed to a rock-shaft, on which is a crank coupled with a connecting-rod attached to the forward end of the tripper-lever. The front end of the tripper is L-shaped, and this end plays normally over a curved guide on the bracket b in such a manner as to strike the free upper end of the curved arm a, unless the tripper-lever is elevated when the lay advances. When the weft thread breaks and the weft-fork is not upheld thereby, the tripper strikes the arm a, and causes a stud thereon to depress the arm R<x> and rock the shaft R, thus freeing the shipper-lever and stopping the loom. A weight is provided partly to counterbalance the weight of the parts. The warp stop-motion is actuated by drops 4 supported on the warp threads. Various forms may be used, that shown in Fig. 1 being preferable. It has in it a slot 4<a> narrowed towards the upper end to form a sloping contact 4<b>, the warp thread passing through a slot above this. Within the slot 4<a> is a terminal contact-bar 5 extending through all the droppers of a series, and preferably made of metal, and in the upper edge of this bar, carefully insulated from it, is set a metal strip contact 6. When the warp thread breaks, the dropper falls vertically until its edge 4<b> meets the contact 6, when the metal dropper tilts over and contact is made with the bar 5 and the sides of the dropper and an electric circuit is closed, this circuit including a generator 7, a switch, and an electromagnet 3. One arm of the lever 1 projects forward, so that ordinarily, when the lay advances, the arm passes above the end of the curved arm a. The other arm of the lever carries an armature 2, which is attracted when the magnet is excited, and the lever 1 then strikes the arm a and the loom is stopped. To prevent adhesion of the threads, means are provided for spreading them vertically, forming a shifting shed, as usual, with the healds, which shed extends from the reed 10 to the drops, and a permanent shed extending from the whip roll 11 to the drops. This latter shed is effected by inserting a single spreader 12, preferably relatively broad and flat, alternate warp threads passing over and under it. To separate the two sheds and to limit the permanent one, the warp passes between two transverse rods 13. A stop bar 8, which may be a flat strip or a round rod or wire, may be employed to prevent the warp threads from dragging the droppers out of line. To detect which dropper has fallen, a nick or recess 4<e> is cut in its edge and all these nicks placed in line, so that, when one falls, its position is at once noted. To break the circuit through the magnet and to free the lever 1 as soon as the shaft R is rocked, a switch is employed consisting of a spring terminal 9 and a similar spring terminal 9<a> on an insulated arm R<x> of the shaft R, the terminals 9, 9<a> being in electrical contact in their normal position, but, when R<x> is depressed on stopping the loom, the terminals separate and the circuit is broken. Yarns, warping.-The stop-motion described above is also applicable to warping-machines and the like.