US628731A - Warp stop-motion for looms. - Google Patents

Description

No. 6282,13. Patented IuIy II, I899.

A. WILKINSON. v

WARP STOP MOTION FOR LOOMS.

(Application filed Mar. 15, 1897.) 2 Sheets$heet I.

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No. 628,73l. Patented July u, I899. A. WILKINSON.

WARP STOP MOTION FOR LOOMS.

' (Applicatiop filed Mar. 15, 1897.) (No Model.), 2 Sheets-Sheet 2,

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. of any ordinary construction.

UTTED 'TAf g l1 ALFRED \VILKINSON, OF BRADFORD, ENGLAND.

WARP STOP' -IVIOTION FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 628,731, dated July 1 1, 1899.

Application filed March 15, 1897.

T0 ctZ 20/007771 it may concern:

Be it known that I, ALFRED WILK NSON, a subject of the Queen of England, residing at Bradford, England, have invented certain new and useful Improvements in arp Stop- Motions for Looms, (for which I have obtained Letters Patent in England, dated January 17, 1896, No. 1,206; in Belgium, dated February 22,1897, No.126,543, and in France, dated December 18, 1896, No. 262,314,) of which the following is a specification.

This invention relates to improvements in looms for weaving; and its object is to provide a simple and efficient stop-motion or mechanism for automatically stopping the loom when one or more of the warp-threads break.

To fully describe my invention, reference is made to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in each of the figures.

Figure 1 represents an end elevation of such. parts of a loom as are necessary to illustrate my invention. Fig. 2 represents a plan View, and Fig. 3 a back View, of the same. Figs. 4 to 9 represent separate detail views, on a larger scale, hereinafter referred to.

The side frames A and A the tappet-shaft A the crank-shaft A the warp-beam A the back beam A, and the starting-lever A are The warp (shown by the broken lines W in Figs. 1, 6, 7, and 8) passes in the usual manner from the Warp-beam A over the back beam A and into the loom. A light roller B, covered with card-filleting or wire card clothing or a suitable equivalent, is mounted over the warp, so as just to clear it. This roller is supported at one end by the journal-spindle B in a hearing formed in the bracket 0, (fixed to the side frame A,) through which the journal-spindle projects, and the other end by the journalspindle B which fits into a bearing formed in the center of the end of the shaft D, which shaft D is mounted in bearings formed in the bracket 0 fixed to the side frame A. The

shaft D is, driven by the toothed wheel D fixed upon its outer end, engaging the pinion D mounted upon the stud D and fixed to the sprocket-wheel D driven by a chain (not Serial No. 627,711. (No model!) shown) from the sprocket-wheel D upon-the crank-shaft.

j A brush E, having a row of bristles e along each side, is mounted in bearings formed in the brackets C C? parallel to the roller B and in such a position that during its periods of rest the ends of the bristles e along the side adjacent to the roller B touch the dents or wire of such roller, as shown in Fig. 1. The brush E is intermittently turned half a revolution during each rotation of the roller B by means of the segmental wheel D on the shaft D engaging the wheel E connected to the brush E. These wheels are shown on a larger scale in Figs. 5 and 9. Flats E E are formed diametrically opposite each other upon the boss of the wheel E and the arm E pivoted upon the stud E bears upon the uppermost fiat, as shown in Fig. 5, and holds the brush stationary after each movement. The tension of the spiral spring S, stretched between the end of the arm E and the fixed hook E determines the pressure of the arm E upon the fiats'FFI The roller 13 is driven in the direction of the arrow shown in Fig. 1. Therefore the brush E is rotated in the opposite direction, and it is located in such a position in relation to the warp that at each movement the bristles pass between the warp-threads and brush them in the opposite direction to that inwhich the warp is moving. Conse quently in case a warp-thread is broken the broken end is brushed back until engaged by the dents of the roller B.

The roller B is very lightly driven by the antifriction-roller B, mounted between lugs B? on its end, resting against the bottom of of one of the two snails or inclines 13, formed on the face of D as shown on a larger scale in Fig. 9. A spring F, fixed to the bracket 0, bears against the end of the journal-spindle B and normally keeps the antifrictionroller 15 against the bottom of one of the snails B, and the inclination or angle of the snails is such that they normally drive the rollerB-g but in case it is retarded in any wayas, for instance, by it having laid hold of a broken end of warp-the roller is free to stop, and the further movement of the snail moves the roller longitudinally in the direction of the arrow, Fig. Ratchet-teeth B are arm H is fixed upon the other end of the shaft H Thearin H extends into the forked arm J of the bell-crank lever J and its other arm J is coupled by the rod J to the startinglever A It will thus be seen that before the longitudinal movemen-tis completed the starting-lever A is disengaged from the usual notch A Fig. 2, in the catch-plate A of-the loom, and it consequently springs inward and stops the loom in the same way as when stopped by the ordinary weft-fork motion.

Toclearthe pawl H from the teeth B and leave the roller B free to be returned to its normal position, the side J of the slot J in the catch-plateis horizontally inclined. This has the effect offorcing the lever forward as it springs inward, and thus drawing the rod J in the direction of its previous movement and lifting the pawl clear of the teeth B \Vhen the lever A is moved back to the positionshown, to restart theloom the whole of the parts are thereby replaced in the position shownin Figs. 1, 2, and 3, and to make the spring F rigid enough to at once force the roller B longitudinally back to its normal po-- sitionthe drop-piece L is provided. This droppiece is-pivoted upon the stud L fixed onthe approximately vertical. branch H of the arm H The drop-piece L isso arranged that as soon asthe pawl H is forced back, so as to move-theshaft H and branch arm H it drops down behind the spring F to the position shown in Fig. 4, and thus-solidly backs up the spring; but as soon as the roller Bis pushed back far enough to=clear the teeth 13 off the pawl projection L comes in contact with the end of the studL, fixed in the bracket O, and the slight further movement of the arm H causes the stud L to lift the drop-piece to the: position shown in Fig. 3. This leaves the spring F quite free and the only resistance opposed tothe longitudinal movement of the roller Bwhen the next warp-thread breaks and. the-loom requires to be stopped. A projectionL playing between the steady-pins L 'L isprovidedon L to limit its movement. The pin F fixed in the arm H is provided for-the end of the spring F to bear upon and confines its movement in relation to the arm H in that direction. A weighted arm H is preferably fixed to the short shaft H and tends to keep the pawl H in its normal position. until engaged by the teeth B A setscrewil is fixed in a projection H on the underside of the pawl'H', by which the normal position of the pawl may be adjusted.

I also employ a vibrating brush N beneath the warp to assist the brush E. This brush is mounted upon arms N loosely pivoted to the quadrants N N in such a manner that the said arms are free to move in relation to the quadrants within the limit allowed by the projections. N4 and N upon the quadrants. The quadrants N are fixed on the rocking shaft N, which is operated by the eccentric N on the tappet-shaft connected to the arm N on N by the connecting-rod N. The brush N brushes the warp in its backward movement, and it is withdrawn from contact with the warp during its reverse movement. This is'effected in the following'way: In its backward movement the brush passes from the-position shown in Fig. 6 to that shown in Fig. 7, and it brushes the warp during the latter part of this movement. Then on the reverse movement the quadrants N commence to move without practically moving the brush, excepting to withdraw it from the warp, and when that has taken place the projections N upon the quadrants engagethe arms N as shown in Fig. 8, and carry the brush forward until it falls over the arms N against the projections N to the position shown in Fig. 6.

A portion of the bristles: of the brush? E are preferably inclined, as shown in .Fig; to more readily lay hold of the ends.

Both the bearings for the brush E and the roller B are of such a construction thatthe brush and roller may be readily removed and replaced.

I claim 1. Ina weaving-loom the combination withthe roller B, capable of being moved'longitudinally and means for rotating it, of the rotatable brush E, mechanism for rotating said brush intermittingly,a starting-lever, a catchplatetherefor, and connectionsintermedtiatev the roller 13 and said starting-lever whereby. the continued longitudinal movement of the roller effects the release of the starting-lever from the catch-plate to stop the loom.

2'. Ina weaving-loom, the combination-with the roller B, capable of being moved longitudinally, means for rotating said roller, of teeth formed on the end of said: roller, apawl adapted to be engaged with the teeth, a rock-arm with which the pawl is connected, a startinglever, and connections between the latterand the rock-arm whereby said starting-leveris actuated as describedwhen the rock-arm is rocked, for the purpose specified.

3. In a weaving-loom, the combinationwith the roller B, capable of being moved longitudinally, means for rotating'said'roller, of teeth on the end of said roller, a. pawl adapted; to be engaged with the teeth, a rock-arm with. which the pawl is connected, a starting-lever, connections between the latter and therockarm, whereby said starting-leveris actuated as described when the rock-arm is rocked, a spring adapted to-,force the roller back to normal position when the pawl is free from. the teeth of the roller, a piece Lpivotally-connected with the rock-arm-and' adapted tocooperate with the spring as described, said piece having a projection adapted to come in contact with a fixed part or abutment to effeet the lifting of the piece, for the purpose specified.

4. In aweaving-loom, the combination with the roller B, and rotary brush E and means for rotating said roller and brush, of the vibrating brush N arranged to brush the warp,

a rockshaft, quadrants thereon, means for rocking the said rock-shaft, arms loosely pivoted to the quadrants and supporting the brush N, and stops on the quadrants for limiting the throw of the said pivoted arms.

5. In aloom the combination of awarp stoproller movable longitudinally, a driven gear having frictional contact with said roller to drive the same, a cam between said gear and roller for moving the latter longitudinally when its rotary motion is impeded, and means for engaging and holding said roller when moved'longitudinally out of its normal position, and a brush adapted to be rotated intermittingly in a direction opposite to that of the warp stop-roller, said brush operating to brush back the end of a broken thread until engaged by the roller.

6. In a loom the combination of a warp stoproller movable longitudinally and having at one end a ratchet, a pawl for engaging said ratchet when the roller is moved longitudi nally, a driven gear having thereon an annular cam operating against a projection on the roller to drive the latter and to move it longitudinally into engagement with said pawl when its rotary motion is impeded, a brush adapted to be rotated intermittingly in a direction opposite to that of the warp stoproller and to brush back the end of a broken thread until engaged by the roller, teeth on the end of the roller, a pawl adapted to be engaged by the teeth, a rock-arm connected.

with the pawl, a starting-lever, and connections between the latter and the rock-arm whereby the starting-lever is actuated as de scribed when the rock-arm is rocked.

7. In aweaving-loom, the combination with the roller B capable of being moved longitudinally and means for rotating it, of the rotatable brush E, mechanism for rotating said brush intermittingly comprising a rotatable shaft, a segmental toothed wheel mounted thereon, a toothed wheel carried by the brush and having its hub providedvwith oppositelylocated flat bearing surfaces, said wheel gearing with the said segmental wheel, a spring-actuated pivoted arm adapted to bear upon the said flat bearing-surfaces, ratchetteeth on one end of the roller, a pawl adapted to be engaged and operated by the teeth when the roller is shifted longitudinally, a shaft for said pawl, an arm on said shaft, a bell-crank vlever one of whose arms is engaged by the first-named arm, a starting-lever and connections between the latter and the other arm of the bell-crank lever, all arranged for cooperation as and for the pur pose specified.

In testimony whereof I have hereunto set my hand in the presence of the two subscribing witnesses.

ALFRED WILKINSON.

Witnesses:

DAVID NowELL, SAMUEL A. DRACUP.

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