US1067941A - Weft-fork actuator for looms. - Google Patents

Description

0. AJSAWYBR.

WEFT FORK ACTUATOR P012- LOOMS;

APPLICATION FILED JULY 3, 1513.

mm M 22, m3.

'INVENTOR. W a. a

wzmzzssas:

I w ATTORNEY.

0. A. SAWYER.

WEFT FORK ACTUATOR FOR LOOMS.

APPLICATION FILED JULY3, 1912.

Patented July 22, 1913.

2 SHEETS-SHEET 2.

INVEN T 0R.

25A A TTORNEK WI T NESSES:

is similarly prevented from operation.

Learner.

ware-r0 a Qpeoifloation of Letters Patent.

n'r OFICE.

GREEN 1%. SAWYER, 0F LOWELL, MASSACHUEETTS.

-ACTUATOR EOE LOOllliS.

I j Application filed Italy 3, 1912. Serial Ho. 707,457.

To all whom it may concern:

Be it known that I, ORREN A. SAwYnn,

a citizen of the United States, residing at Lowell, in the county of Middlesex and Commonwealth of Massachusetts, have invented -a certain new and useful improvement in Weft-Fork Actuators for Looms, of which the following is a specification.

This invention relates to weft-fork-actnatone for looms, in which a stop-motion on weft-replenishing devices is controlled by such a fork and a rack and involves supporting the rack independently of the lay and making the rack movable synchronously with the beating up of the lay in such a manner that the bars of the rack will always register with the spaces between the tines of the fork.

In most common plain looms for weaving cotton or Woolen goods there .is a stop-mo tion which is prevented from operation by the presence of an unbroken weft or filling thread between the shuttle in the shuttlebox and the cloth and in many weft-replenishing looms the weft-supplying mechanislm n each case, a weft-fork is pivoted on a slide which is supported on the breast-beam and said fork is provided at itsfront end with a hook, the ofice of which is to engage a vibrating arm of a rock-shaft and to cause the slide which supports said weft fork to be movedto release or actuate the devices which shift the belt or otherwise stop the loom, or which introduce a new supply of filling. The lay-beam of such a loom, as hitherto constructed, is provided between the reed and one of the shuttle-boxes with a rack or plurality of vertical bars and the rear end of the weftfork is bent down and divided into tines, each intended to pass through one of the spaces of the rack in the absence of a weft-thread, but when a weft-thread is held in front of the rack, the

tines or fingers of said; fork are pushed for-- or between the tines of the fork, on the other, are made quite narrow in order that the friction of the yarn on these bars and tines may be sufficient to prevent the yarn from simply looping back and forth between lay to swin said bars and tines without tilting the lever, the tension of the-yarn" in the shuttle being very slight, and the yarn between the shuttle (when in the box) and the reed being frequently loosened by the rebound-of the shuttle in thebox, so that the tension of the yarn is insufiicient to tilt the fork. Lintgathers-on the rack or fork or on both and causes the fork to be tilted after the weft is exhausted or broken. When the weftfork continues to be tilted after the break-- ing or exhaustion of the filling, the loom continues to run and makes a thin place in the cloth. It is necessary. that the weft-fork should be carefully set and revented from lateral movement on its fu crum, in order that the tines of the fork may notbe hit by the rack and tilted in the absence of the fillin and also in order that the tines of the ark may not be broken, battered or bent by contact with the rack. Sometimes the tines are so bent laterally that the fork is tilted by-the rack, in the absence of filling. Frequently the fork is caused to strike the rack by the lay shifting position laterally in itslbearings. Sometimes the wear of the pitman connections, the straps and boxes which connect the pitman to the lay, and the crank shaft become so Worn as to allow the too far forward in beatin up, so that the are of the rack strike the c osed ends of the spaces between the tines of the fork and tilt the fork in the absence of filling. Sometimes a training end of ex hausted or broken filling will continue to tilt the fork making a thin place. The lint which gathers on the rack and on the fork is frequently carried into the cloth, making thick places i or bunches.

By the improvement hereinafter described, l obviate the difficulties above mentioned. I accomplish this by supporting the rack upon a pivot in such a manner that the bars of the rack always register with the spaces between the tines of the weft-fork,

and the rack enters the fork at every pick,

clearing the fork and rack of lint and loosening the trailing thread and looping said trailing end. into both the fork and rack in such a manner that it can tilt the fork but once.

In the accompanying drawing, on two Patented July 22, 1913.

sheets, Figure 1, is a right side elevation of a part of a loom showing the weft-hammer, its actuating cam, the \veft fork, its slide and stand, the tilting rack, the springpusher supported on the sword of" the lay, and in vertical section the lay beam and reed-cap, Fig. 2, a front elevation of parts of the frame, breast-beam, lay-beam, reed, reedfcap, weft-fork, stand and spring-pusher;

Fig. 3, a right side elevation of the rack, weft-fork, its stand and slide, and the upper part'of'the weft-hammer, the fork and rack 'vation of the weft-fork an being shown in full lines in their untilted positions, in dotted lines in the positions they occupy when tilted; Fi 4, a rear elerack with a -weftthread between them; Fig. 5, a right mer, the same being a bent-lever, the lower end a of which rests upon the cam b, said weft-hammer being fulcrumed at 0 and its upper end 0 being swung forward by the lifting of its lower'end by "the cam b, and returned by gravity ;-D, the weft-fork which is a bent lever fulcrumed at din the slide E, and having a hook d to be engaged by i the upper end 0 of the weft-hammer when the filling is broken or exhausted, and to be drawn forward carrying with it said slide; F, the stand, on which the slide moves; A, the breast-beam; G, the lay-beam; g g, the lay-swords; 9 the reed-cap; and H, the reed; all these parts being of the usual construction and operation, except as hereinafter stated, and the slide being connected by intermediate mechanism with a belt-shipping lever or other device which shuts off the power from the loom when the slide is drawn forward.

The rack, I, instead'of being merely a series of bars arranged in a common plane and carried by the lay in theusual manner, is here represented as similar in form to the weft-fork D and pivoted at 2', in the same slide E in the-rear of the fulcrum d of said weft-fork (Figs. 3 and 5) in such a manner that the tines or bars 2' when swung forward will register with the spaces between i the tines d of the weft-fork, the fulcrums parallel with each other and both turning in the parallel sides 6 c of the slide E. The rack is nearly straight (but has a downwardly curved offset immediately back of its hub, as hereinafter mentioned) and its front end is weighted at 0 and normally rests upon a stop-stud 2' which projects horizontally from an inner wall ofthe slide E, (Fig. 3), so that the rear or forked arm of the rack is normally in a nearly horizontal position as represented by full lines in Fig. 3, so that when the lay heats up, the weft or filling thread carried bythe lay, passes first under said forked arm of said rack. When the lay has almost completed its forward movement the front end of a spring-pusher the back of the weft-fork, and tilting said I weft-fork and raising its hook out of the path of the upper end of the weft-hammer so that the slide is not moved and the stop-motion or filling changing'devices are not operated. The operative movement of therack is limited by a radial projection i on the hub 2' of said rack striking the under side of the stop-stud i above mentioned.

(Z of the weft-fork are representedas connected by a cross-bar d which serves to stiffen said tines and to preserve the spaces between said tines and furnishes an additional precaution against-the interference of said tines with the bars of the rack.

The spring-pusher J is represented as a I fiat-sided rod j sliding in a bearing j supported on a bracket {1' carried by the sword g of the lay and forced forward by a spring j surrounding said rod and compressed between the head 3' orenlarged front end of said pushen'and said bracket 7' the shape of-said rod and its bearing preventing the rod from turning and the spring being of sufiicient strength to tilt the rack but sufliciently yielding to avoid breaking or bending the rack after the projection i is in contact with the stop-stud 2' In Fig. 7, the outer tines only of the fork are represented as joined by the bar (i and the free ends of the bars of the rack are joined by a cross-bar 6 to stiffen and strengthen said bars and the middle tine of the fork is cut away toallow said cross-bar 2' to pass under it.

I claim as my invention- 1. The combination in a loom of a weftfork, a pivoted rack, the bars of which are arranged to register with the spaces between the tines of said fork, and means carried by the lay for swinging said rack into said fork at each pick of the loom. or hubs of said weft-fork and rack being 2. The combination in a loom of a weftifork, a pivoted rack, the bars of which are i arranged to register with the spaces between ;the tines of said fork, and'means for swinging said rack into said fork by the forward movement of theday. v

3. The combination in a loom of a weftfork, a pivoted rack, the bars of which are arranged to register with the spaces between the tines of said fork, and yielding means carried by the lay and adapted to engage 85 In Fig.4, the lower free ends of'the tines staid rack and to swing said reek into said ,0 york.

we eembii'istion in loom of a weft .n i i said in i1 and not turning on parallel pivots in said slide and the "s of said reek being arranged to ith the spaces between the tines of said LO and nieam mined by the lay for swinging" said rack into said fork.

5 The combination in a 100m, of a piv eted weft-fork, a pivoted resin the bars of which are arranged to register with the spaces between the tines of said fork, a stop to limit the swinging of said rack into said fork, and a spring-pusber carried by the lay 6. The combination 1n :1 loom, of a pivoted weft-fork having the outer ends of its tines connected by a cross-bar to stiffen the 20 same, and a pivoted rack having bars arranged to register with the spaces between said tines, and means carried by the lay for swinging said, rack into said fork.

In witness whereof, I have affixed my sig- 25 nature, in presence of two Witnesses.

ORREN A. SAWYER.

Witnesses ALBERT M. MOORE, AGNES C. Klnwm.

Images