Patent GB-108709-A (GB)
Title: Improvements in or relating to Shuttle Checking Motions for Looms.
Inventor: CROWTHER DAVID STONER
IPC: D03D49/52
Filed: 1916-08-14
Abstract: 108,709. Crowther, D. S., Wright, I., and Routledge, W. Aug. 14, 1916. Swells; shuttle-relief motions.-In shuttle-checking motions of the kind in which the resistance to the motion of the shuttle increases as the shuttle passes into the shuttle box, a swell is acted upon by two springs, of which one is applied at approximately the centre of the swell with constant pressure and the other is carried by a rocking lever pivoted to the lay and controlled by lever mechanism carried by the lay and coacting with a fixed or adjustable stop on the loom frame, so that it is in and out of operative position at the appropriate times. In another form, a swell with inclines on its inner face and a curved cuter face is acted upon by a spring arm controlled by a bell-crank lever pivoted to the lay and a cam-stop on the loom frame. In the form shown in Fig. 2, a swell e having pin-and-slot connexions with the shuttle box to permit of its moving laterally is permanently engaged by a flat spring f secured to the shuttle box and applied at about the centre of the swell. When the shuttle enters the box, the swell is moved to engage a spring-controlled pin g<1> on a bell-crank lever h, h<3> connected by a link i<5> to a bell-crank lever i<4>, i<2>, to which is pivoted a rod i<1> having a bowl i' in engagement with an inclined surface i<8> on a bracket secured to the lay, the rod i' being moved into the position shown in full lines by its engagement with a stop i on the loom frame. On the return motion of the lay, a nut i<11> on a rod pivoted to the rod i' engages a stop i<10> on a fixed bracket A and moves the rod i' to the position shown in dotted lines to remove the pressure of the spring rod g<1> from the swell. The stop i is moved into position to be engaged by the rod i' by the mechanism which controls the picking- clutches. The rod i<1> may be pivoted to a lever on the lay having a bowl adapted to engage an inclined surface formed on the end of the stop i, the return movement being effected by a spring i<0>. In a modification, the swell is formed in two parts e, l, Fig. 14, the part l having an inclined surface l<1>. The spring-pressed rod g<1> may be replaced by a flat spring secured to the lever h or by an arm m pivoted to the lever h and controlled by a spring m<2>. The arm may have a curved contact surface m<1> or an end projection adapted to engage the pivoted part l of the swell. In another modification, the pivoted part of the swell carries an additional spring, with which the shuttle engages. In a modification of the controlling-mechanism, an arm p of a bell-crank lever p, p<1> on a bracket p<3> on the lay is adapted to engage a fixed surface o. With the parts in the full-line position, the arm p' engages a notch p<2> in the rod i<1> to keep it to the right, so that the contact arm m engages the swell. When the lay moves in the direction of the arrow, the arm p slips off the surface o and the rod i<1> is free to be moved to the left through the action of the spring m<2> to release the pressure on the swell. On the return movement of the lay, the arm p engages the surface o and is thus turned into the position shown in Fig. 15, a notch q in the end of the rod i<1> engaging the pivot of the bell-crank lever. When the arm reaches the end of the surface o, it is turned by a spring q<2> on the rod i', and, on the next forward motion of the lay, it is again moved into the full-line position. In another modification, the rod i<1> has a slot-connexion with one arm of a bell-crank lever mounted en the lay, the other arm being adapted to engage alternately two fixed stops mounted on an arm. The stops may be moved into position for engagement with the bell-crank lever by means controlled by the picking - clutch control mechanism. In another modification, the lever h, Fig. 16, is normally pressed by a spring r to apply pressure to the swell, the pressure being removed by the action on an extension of the lever h of one arm of a bell-crank lever s connected to the rod i'. In the other form of the invention, the mechanism for releasing the pressure on the swell is controlled by the presence of the shuttle in the shuttle box. The swell e, Fig. 18, has inclined surfaces for engagement with the shuttle and a curved surface v engaged by a spring-controlled. lever v<1>. One arm w<2> of a bell-crank lever pivoted to the lay engages the lever v<1> and a stop w<3> on the swell, the other arm w<1> being adapted to engage a spring-controlled cam-piece x pivoted to the loom frame. When the shuttle is absent, the parts occupy the positions shown in dotted lines. When the shuttle enters the box, the swell moves outwards against the action of the lever v', the bell-crank lever being moved to the position shown in full lines. When the lav moves forwards, the cam-piece under the influence of its spring again assumes the position shown in dotted lines, and on the backward movement of the lay, the arm w<1> engages the left side of the campiece so that the bell-crank lever is turned to remove the pressure of the lever v<1> from the swell. According to one of the Provisional Specifications, the cam-piece may be adapted to control a switch of an electro-magnetic picking-motion.