US172833A - Improvement in let-off motions for looms - Google Patents

Description

4Sheets-Sheet 2 G. E. TAFT.

LET-OFF MOTION FOR LQO'MS.

No. 172,833. Patented Feb.1,1876'.

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. MAoHINE-woRKs," on NORTHBRIDGE,3MASSAOHUSETTSI .IIMPROVIEMIEINT. mi.EtroFFQNioTIQNs F: OR:- Looms. g i

I Specification forming part ofv IiettersPatent Not172K833ndatedFebruary L'lfiioj applicationlfiled' Deceinber 6, 1815; I

'To all whom it may conccwth r 3 Be -itknown .that 'I', GUsTA'VUS E. TAET, of

Whitinsville,-'town of Northbrijdge,' in the county of Worcesterand State of 'Mas'sachu setts,have invented anew and useful Improvement in Let-Oif Motion for Looms, which. is fully set forth in thefollo-wing specificatiomj The 'Bartlett? .let-oii motion .for many years has'been themost used, andsin one of 1 for heavy goods the Bartlett motion refuses. to act reliably.

To reduce the number of parts, to attain more direct action, and produce a let-0E motion that is better, and more generally applicable for light and heavy goods, is the'object of my invention.

Having given the nature and object of my invention, I will now describe its construction and operation, reference being had to the accompanying drawings, making a part of this specification, and to' the letters of reference marked thereon.

All the parts of looms to which this is applied can be as ordinarily constructed, except the let-off, and of this the pawl-wheel and pawl, worm and worm-wheel, of the Bartlett invention are retained.

Of the drawings, Figure 1 is a view of the let-01f and parts connected with it, as seen from one end of the loom, without showing the loom-side. Fig. 2 is aside elevation of the same, showin g at A a section through the plate or web of the loom-side. Fig. 3 is a plan of the slitted bearing. of the worm-shaft. Fig. 4 is a section through axis of same. Fig. 5 is a plan of the guide or holder of the spring-rod, and is clamped on the outside of slitted stand I. Fig. 6 is a side elevation of same. Fig. 7 is aside view of the adjustable cam for operating the let-oft at the desirable time. Fig. 8 is a section through axis of same. Fig. 9 is a side iview-o-r a loomwith asimpleform' of Bartlett motion. l

:on its wayl throujgh the lay tofthe take up: Experiencehas' shown-that the, best letofl inechanism among the manifold kindswhitgh have been used. the last twenty yearsjorregulating the supply of warp required ,by the laylwhe'n the filling isbeirigbeatffinis anos- 'cil-lating whip-bar, connectedbymeans of rods andsprings, ratchet'an'dpawl, to aworm-shaf t',

and-throughthe worm-wheel communicates j motion to the yarn-beam, causing the yarnl'to let off accordingasthe strainlof yarn gives more orless motion to the oscillating whipbar. D is an adjustable arm on the end of the whip-bar, the outerend of whichis acted upon by the cam E, whichis fixed upon the hub of the gear 6, which is upon the crankv shaft. F is asmall shaft, with a pinion, f, which gears into the gear-wheel on the head of the yarn-beam. This shaft F also has on 'itja worm-wheel, G, which is operated by the worm H upon the worm-shaft h. This wormshai't'is supported by the slitted stand I, which has secured to it the rod-guide J. The'upper end of the rod j is pivoted to the whip-bar arm D. Near the upper part of the rod j is an adjustable' collar, K. Near the .lower end of the rod j is an adjustable arm, L. A spiral-wire spring, l, bears upon the fixed rod-guide J, and upon the under side of the collar K, tending constantly to raise: the arm D. The upper portion of the part L has a hole to receive the short rod M. The short rod M has two adjustable set-collars, m m. The lower end'of the rod M has an eye, which fits loosely over the spur n of the pawl-lever N. This pawl- ]ever has a hub, which fits loosely over the V slitted stand I, and at the opposite end from the spur n is a pawl, P, which is kept up to its work by the socket-spring 10. O is the pawlwheel, which is on the end of the worm-shaft,

which would turn loosely in the slitted stand I but for the following reasons: When the take-up draws hard on the warp-yarns the tendency to turn the yarn-beam is so great that it will turn the worm-shaft unless some-' i B is the yarn-beam a, theyarn estimate ly. empty beamipassing .over the whip-bar O thoroughly to the worm-shaft. The gear Sai s with-it the spring-rod J, and parts connected thing is made to resist it; Formerly a weight attached to a leathern strap running over 'a frictiompulley on the yaru-beamwa-s used, butiini the Bartlett motion a small pulley (Q, Fig. 9) on a vertical shaft, with a spring and strap, is made use of; but these pulleys and straps detract from simplicity, are unreliable fromoils and atmospheric influences, an d are; inconvenient tokeep clean a from Q the, dustand, waste of the weave-roo'm. The frictionI pro-' duce by simply turning the screws in the hub of J. This springs inthe.,sidesof the slittedf end of the bearing-stand I, hugging the wormshaft h, and producing the requisite friction, which canbe adjusted to a nicety. The projeotion r in the hole of thehub of part J fits in a corresponding groove, 1", over the slit in stand I, and prevents the part J from turning. The groove and-slit help to convey oil.

on the cam-shaft, and is onlydrawn tolshow its relative position. t .n

The operation is as follows: Whenethe take-up draws hard upon the yarns a, the: arm D of the whip-bar O is forced down, carrying with it the spring-rod j. The hub of part L, being fixed to lower part ofrod j, is also carrieddowmandwit'h itthe short arm of the pawl-lever N, which raises the other arm of the pawl-lever,and with it the-pawl,i and sets it ready to turn the pawl-wheel, which is fixed to the worm-shaft." Whenthe largest. part of the cam E-throws the arm D up, and

and. lets off the yarn as desired. When the yarn beam is full, and the diameter. of; it large, ans n alhpartofiarevolutionQlets off the requisite warp, and during a beat of the lay the Strain of the yarn on the whip-bar does not cause thei-pawl 1 .set over so 1 many teeth of the ratchet as when the beam is nearly empty,

and revolves the quickest. Having-described its constructiontand-operation, what I claim as my invention, and desire to secure by Letters Patent, is-

1. The worm-shaft holder I, provided with a slit and groove, in combination withthe arm J,pro vided,with a set-screw, S, projection; r,

andguide-eye-T, whereby the rod j is main; tained iuposition, all being constructed to op erateas shown and described.

2, The combination of the whip-bar arm rod j, arm L, rodguide and friction-clamp J,

slitted stand Lpawl-lever N,-.ra tchet-wheel O,

worm-wheel-G, worm H, worm-shaft 1b,; shaft F,iwith.the pinion-which gears into the spurf gear on thebeam-head, essentially as d escribed. i i v a GUSTAVUS TAET. "Witnesses: L a

R0131. K. BROWN, "HENRY B. OSGOOD.

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