US2897843A - Lay for weaving looms - Google Patents

Description

Aug. 4, 1959 Q 2,897,843

W. A. SHERWOOD ET AL LAY FOR WEAVING LOOMS Fild Oct. 17, 1956 5 Sheets-Sheet 1 Amnmuunun w l; III I I ATTORNEYS 4, 1959 w. SHERWOOD ET AL 2,897,843

LAY FOR WEAVING LOOMS 3 Sheets-Sheet 2 Filed Oct. 17, 1956 INVENT 111mm a. MD. M M r W ATTORNEY 2,897,843 Patented Aug. 4, 1959 LAY FOR WEAVING LOOMS Walter A. Sherwood, Hempstead, and Thomas D. Verrill, Farmingdale, N.Y., assignors, by mesne assignments, to Farmingdale Manufacturing Corporation, Baltimore, Md, a corporation of Maryland Application October 17, 1956, Serial No. 616,403

11 Claims. (Cl. 139-188) This invention relates to a lay for weaving looms andv particularly to the lay support and cam assembly, for

use with a loom in which the shuttle boxes are fixedthe lay after beat-up in the position where the shed is' open to form a clear passage for the shuttle throughout its entire flight, thus eliminating shuttle marks and reducing wear on the shuttle and reeds, while making it practical to use a lighter shuttle.

Another object is to provide positive and accurate positioning of the reed on the lay when beating up and when at dwell.

A further object is .toprovide a very light lay structure, weighing as little as of the weight of a conventional lay assembly.

.Another object is to provide greater clearance between the lay and the harness.

A further object is to provide certain improvements in the form, construction and arrangement of the several parts by which the above-named and other objects may effectively be attained.

A practical embodiment of the invention is shown in the accompanying drawings, wherein Fig. 1 represents a warp-wise vertical section through the lay, race plate and frame brace, showing the lay support, the reed being in beat-up position against the fell of the cloth;

Fig. 2 represents a view similar to Fig. 1, with the reed retracted and the race plate in shuttle-supporting position under the shed;

Fig. 3 represents a detail perspective view (parts being broken away) of one end of the lay and its supporting and driving means;

Fig. 4 represents a warpwise vertical section, showing in elevation the lay driving cam, followers and con necting rod;

Fig. 5 represents a detail view, similar to Fig. 4, showing the cam turned 180 from the position of Fig. 4;

Fig. 6 is a simple graph showing a recommended cycle of operation for the lay and its relation to the period of shuttle travel;

Fig. 7 represents a detail horizontal section through the cam and adjacent parts, taken on the line VII-VII of Fig. 4; and

Fig. 8 represents a warpwise vertical section showing an alternative form of lay support.

Referring to the drawings, it will be understood that the mechanism shown herein is particularly adapted for use in a loom having its shuttle boxes fixed to the frame and the picking mechanism likewise mounted on the frame independently of the lay.

The harness supporting and operating mechanism is indicated diagrammatically at 1, a shuttle box at 2, shuttle at 3 and a frame brace at 4. The upper and lower warp yarns 5' and 5" are moved in any customary manner to form the shed 6, and the woven cloth 7 extends toward a take-up roll (not shown) from the fell 8. The drive shaft 9 is mounted in the frame and driven in the usual manner. To the extent that only one side of the lay and associated parts may be shown and described, it will be understood that the opposite end comprises a mirror image of that shown, unless otherwise stated.

The lay includes end brackets 10 having a Vertical part 10' and a lower offset part 10", the form of the latter part being such that it can move freely in a horizontal direction past, and embracing, the frame brace 4, as clearly shown in Figs. 1 to 4. The reed-cap 11 is firmly fixed at its ends to the tops of the brackets 10 by means of the reed-eap clamps 12; the reed bed 13 being welded to the brackets and preferably including a channelshaped part 13 adapted to receive the bottom edge of the reed 14. Adjacent the reed, the race plate 15 is fixed to the offset parts of the brackets, its upper surface being disposed to lie as nearly as possible in the plane of the bottom of the shed.

In the form shown in Figs. 1 to 4 each bracket has a split mounting block 16 secured to its lower end and projecting outwardly therefrom, each such block being assembled on a slide rod 17 and fixed in its properly adjusted position thereon by means of the screws 16'. The rods 17 are slidably supported in elongated bushings 18 fixed on the frame brace 4, the bushings being preferably either made of, or lined with, a suitable antifriction material. The drive end of each rod 17 is in the form of a clevis, by means of which it is pinned .to the end 'of a stud 19 passing slidably through one end of a turnbuckle 20, the inner end of the stud being threaded and surrounded by a spring '21 adapted to bear against the inner end wall of the turnbuckle and against a washer and lock nut assembly 22 on the threaded end of the stud. The other end of the turnbuckle is threaded to receive the threaded stem 23 of the cam yoke 24.

The drive shaft 9 (a straight through top shaft without offsets) passing through the elongated opening 24 of the yoke, is provided with a bearing 26 serving to guide the yoke in a straight line path between its advanced and retracted positions. The shaft is slotted, as indicated at 27, and the more or less ovoid cam 28 and the reniform cam 29 are keyed to the shaft with their axes of symmetry lying in the same plane. The cam 28 bears against the roller 30 and causes the feed or beatup stroke of the lay, while the cam 29 bears against the roller 31 and acts to return the lay to its position of dwell for the passage of the shuttle (Fig 6), the rollers 30 and 31 being mounted on opposite ends of the yoke. The cam assemb'ly is secured in proper position on the drive shaft by means of a clamp 32 (which may conveniently be shaped to constitute a counterbalance for the cams) and a smaller clamp 33, the latter being spaced from the bearing 26 by means of a ring 34, and the cam 28 being spaced from the bearing by means of the spacer 35.

The frame brace 4 is provided with a stop 36 aligned with each of the lay brackets, the stops being adjustable (Fig. 4) in order to ensure proper positioning of the lay assembly at dwell, the adjustable stops cooperating with the action of the spring-loaded turnbuckle to obtain this result. On the forward (beat-up) stroke of the lay the turnbuckle part of the connecting rod assembly acts as a solid member. The spring 21 is sufiiciently preloaded to overcome the inertia forces of the lay and its supports during the return stroke (toward the left in Figs. 1 to 4). Near the end of this stroke, resulting from the action of cam 29 on roller 31, the lay support brackets come against the stops 36 and are held there by the continuing action of the cam which causes the spring to compress .,(Eig.., 5 )i..as the, turnbuckle assembly stretches, the spring force serving to hold the lay assembly firmly in its proper position during the dwell part of --the.cy.cle. ;At:xthis:}time.'-.the shed .isHwide'opentan it .remains soduring -.the..entire shuttle flight so that chafing .by the zshuttles is.- minimized. Furtherm0re, since. the .shuttleis not obliged .to. force its way; through a closing shed, the. shuttle canbe made lighter. (e.g,-, .of aluminum) or.smaller.whilei still carrying thessame yardage .-.o lweft yarntorcan..be,designed .to carry-substantially greater yardage.

alternative form. of support is;.-sho.wn in Fig. 8,

-wherein':the,.lay. assembly is mounted. on.,light.weight {tubular rods-37, the lowerendsof which are clampedat .33.to av rockershaft 39 atv the base. of the loom. Each slay; bracketisoperated through a connecting rod and .-cami drive, assembly ,as described above, the. only dif- ,ference,being .that;the.,lay-motion isjalong arather flat -arc. with-therocker; shaft as its center instead of being .in a straight line.

. The desirable lightness of the lay assembly may result in part-from the use of .extrudedmetalshapes (e.g., of aluminmn),. ,for:,tl1e. reed ,cap. 11, reedbed 13,,and race plate 15, or some of them. The reedcap may be secured to ,the lay-,brackets-by means of the quick-disconnect clamps 12,. so-that reeds canbe interchanged rapidly easilywhen desired. While the lay-driving-cams and -.connecting rods,;are vreferredto as being duplicated on the rightand left sides of the loom it should be. noted that such duplicationmay. be unnecessary in a narrow .,tabric loom and the description and claims are to be ;I. W t s. n e t n i In the-structure disclosed, the usual cumbersome lay .t wqr s-andhq l y amt a Shuttle .bqx s have be nte aiin t tthu a i lch eveme t the bjec Pr vi us y n r t Thebwtst is 1 greatly shortened ,being only about half of-that normally used perrnitting the reed to beat-up, clear the shed and dwell in a- -srnooth cycle, more than half of which may bepccupied by the dwell, as shown in Fig, 6.

It. will-bennderstood thatvarious changes may be made in the form, construction and arrangement of the several ,parts ,andin their mode of operation. without departing from; the, spirit and sc ope of theinvention.

.. What weclaimis:

1. Alay ,assemblyandsupport for weaving looms having,. -s tationary. shuttle boxes comprising, vertical end brackets, alreedassemblysecured to and extending between ,said brackets, arace plate secured to and extend- ..ing between said brackets, means supporting said brackets for reciprocating.horizontalmotion, driving means for reciprocating, said brackets and the parts secured thereto between the beat-up. position and a predetermined retractedpositiomand connecting rod assemblies connecting said driving means to said brackets, said connecting rod assemblies being resiliently variable in length.

7 2, Alayassembly and support according .to claim 1 which includes a rigid and adjustable stop against which the lay assembly is. firmly held in its retracted position.

3. A lay assemblyand support according to claim 2 in which each connecting rod assembly contains a spring so disposed as to permit the length of the assembly to vary resiliently while the lay assembly is held against the stop.

4. A lay assembly and-support according to claim 3 in which eachconnecting rod assembly is designed to have its length rigidly fixed during the beat-up stroke.

5.- A l ay assembly and support according to claim 2 in which the stop, is so. located as. to limit the retracting motion of the reedto a position closely adjacent the shed.

6. A lay assembly and support according to claim 1 in which thev loom. includes. av frame brace extending across the loom approximately beneath the fell of the fabric to be woven, in which the end brackets are so shaped as to partially embrace said frame brace, and which includes rigid and adjustable stops carried by said frame .braceiorengaging said brackets in the retracted position. of the .lay assembly.

7. In a lay assembly and support forweaving looms, a pair of end brackets each having an..upper vertical part and a .lower. horizontally offset part, means for attaching a reed capv to. the toplof each vertical part, a race plate having its ends fixed.on the offset parts .and means for supporting said brackets for. ireciprocating horizontal motion.

8. A lay assembly and support according to claim 7 posed bushings, a pair of'rods slidabletherein and means for fixing the lower offset part of eachbracket to one of said rods.

9. A lay assembly and support according-toclaim 7 in which the support comprises a rocker shaft at the base of the loom, a pair of substantially vertical rods having their lower ends pivotedon said rocker shaft, andmeans for fixing the lower ofiset part of each bracket to the upper end of one of saidrods.

10. A .lay assembly and support for weaving looms provided with stationary shuttle boxes andshuttle-picking means comprising, a reed assembly'and support-therefor, driving means including a cam for reciprocating said reed assembly between; the beatup position and a predetermined dwell position close to-the shed, and'means including a stretchable connection between said cam and the reed support for holding said reedlassembly in said dwell position at least during the entire-shuttle flight.

11. A lay assembly and support according to=claim 10 in which the reed assembly is held in dwell position during each sequence of shuttle picking-,[flight and boxing.

:aReferenms (Jited in the the of this patent UNITED STATES PATENTS

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