US42461A - Improvement in let-offs for looms - Google Patents

Description

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G. GROMPTON. 4LET-UPF FOR LOOMS. No. 42,461.. Patented Apr. 26, 1864.

77K# @5565,y MIZ H llnireo STATES Minier FFICE@ GEORGE UROMPTON, 0F WORCESTER, MASSACHUSETTS.

'Specification forming part of Letters Patent N0. 42,4611, dated April 26. 1564.

To all whom it may concern 'Bc it known that I, GEORGE GRoMP'roN, of the city and county of Worcester, in the State of iiiassaclnisettsfhave invented anew und useful Improvement in Let-Oli' Motions for Looms, of which the following is a full and exact description, reference being had to the' accompanying drawings', making part 0f this specification, in which- Figure l is a side elevation of a loom with said improvement applied thereto. Fig. 2 is a lan of the same.

y The same letters indicate like parts in both figures. 1 Y

My invention reluies io that pnrt of the loom known as the letot'lnotiou for conf trolling the delivery of the warp from the Warp-beam in a uniform manner, and is ofthat class of letoifsknow-n as tension let-offs, und which I'will now proceed to describe.

Fig. 1 is, a side `elevation representing the ordinary frame of a loom. 'A is the` warpbeam, which, with its gudgeons, rests ou bearings VL L. M M is the warp, passing from the beam over the. roller and under the roller F. and thence upward over the Whip-har or roller K to the harness. Friction-straps() C, fastened to the frame at N N, are carried over each beam-head, which have a groove cut into their peri pheries B,I to receive the cords or straps",

and are then continued and secured ti:- t-ne lever-frame Dd). The rollers E and i supported in suitable bearings, as seen in Fig. 2, ateach end in. their respective .frames D D and G G, and are parallel to each other and the warp-beam. The frames D D and'Gl G are respectivel y hung on pivots or studs a-t I I and H `Ici, so' they will-hang freely, (bars may be used where rollers are shown, but I prefer the employment of rollers.) The frames contalrlmg the rollers are tender-like in form for the purose of strength, so that-when one end of the oller moves the opposite end will 'nove with it. To the tension-roller frame is suspended aweight, J, of sulcient gravity to produce the requisite tension upon the warp.

The warp M M, passing from the warpbenm over what may be .termed the 1" rictiou-roller-E in the frame D D, and then under the roller F in the upper frame, G G, and the ten sion-wei ght `beingattached'thereto, bears upon the frame D D. The fri'ction-straps,being attached thereto, produce friction and hold `the warpbeam tirmly. Asthe wearing progresses, the weight J is graduali y drav-:n u1l to such' a point as t0 relieve the pressure on fhe friction-roller and frame, thereby slnchening the friction-straps and allowingthegrnrity ofthe weight to draw cti' a portion of warpnnd lowering the'weighted frame until its pressure is sufficient to tighten the friction-straps and hold the beam firmly until the tension-weight is again drawn up by the progress of 'neavin when the `friction is avain relieved, and still more warp is yielded as before, and so on. The tension being the indicating'power, it libcrates the friction upon the Warpbea-m Whenever needing more warp for' the weight to gravitute upon and produce tension, which is always uniform whatever may he the diameter of the beam.

In Fig. 2 it will be see-u the rollers in the roller-frames I) D and G G extend the entire width of the warp-beam und the warp is taken from it in perfect 0rder,`the frame-rollers being' parallel therewith, and also with the whip roll or nur K. No slack selvages can be made. Each thread ot warn is of an equal tautuess, thus producing unequal strain on each thread of warp in weaving and more perfect selvages on the cloth when Woven.

Other inventions have embraced the combination ot' tension with friction on thebeanias, for instance, using one weight-,for thetension of the yarn, and an independent weight for the friction on the Warp-beam. The tensioirweight in such case being4 so connected that when the tension-weight. had 'reached its hightest point, it would, when liberating, the

friction on theqyarnbean1, have to raise the friction-Weight7 therebycreating an .undue tension upon the Warp while sofen'gaged; or it' using one Weight for both tension of warp and friction to hold the beam, the friction was applied to the periphery of the yarn on the beam; or using one weight for tension attached to a roll, (but not-in a framed lever or lever of any kind,) which,^as\it ascended by the progress of Weaving and reached a certain point,

, constructing n. letoif molou'that the tension? :roller and friction roller shall be' sustained in 4rigid framed levers the width of the warpbea'xri :that in their operation they may be pnallelwith each other nud the warp-benin,

so :is to prevent one side of the worp' being more unduly strained thun the other; and also so combining the tension and friclion irmnes that. :is/the l'ornier rises'nnd diminishes its pressure upon the friction-frame it. shall relieve the friction on the warp-benin for theV purpose ot' letting oil' the Wnrp, as described, and also combining; the upper frnlne tension and weightedlever with the wai-mami the wnrp beiunas herein described, l'or the pur- 'posesl ol' tensionou the. w'nrp und producing. `friction ou the benin.

Havingvthus fully described my said invention, what. I claim therein :is n(\v,:u1d\\-'ish to secure b v Letters lnteut,l is- 1. The coinhiiuuion ol thc tension and riction rollers or bnrsg und theirrespectiveirnlnes,

2- l 42,ee1-

the te11siouw'eight,'alid warp-beam, withl the werp ns described. l

. 2. V.The combination of, the tension' and fric- L tion framed levers and rollers/or bars therein, und "the teneionwveight, with friction o u 'the beam head or heads, as described.;

3. The' combination ofthe weighted tension frauieddever and' roller or bar therein'with the werp-beam, es described, for the purpose of producting tension on the warp and friction on Lhebetun. v

4. Diminishing or increasing the pressure of the tension frame roller orbnr through the i warp upon the friction-frame roller or bar by the tensionw'eieht, for the 'purpose of relieving: or holding the friction on the Warp-beam. p

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