US104949A - Improvement in let-off mechanism for looms - Google Patents

Description

waited gisten tlirnt @Wina LEWIS N. FLETCHER? ANI)A IRA M. PAGE, 0F LOWELLVMASSAGHUSETTS.

Leners Patent No. 104,949, aan .my .5, 1870.

IMPROVEMENT IN LET-OPF lIVIIlCHIAIi'llfoM'IOIIR LQOMS.

The Schedule referred to in these Letters Patent and making pari: of the same To all whom it may concern Be it known that we, LnWIs'N. FLETCHER and- IRA M. PAGE, both of Lowell, in the county of Middlesex and State of Massaclmsetts, have invented certain new and Auseful Improvements Aiu, Looms, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing making part of this specification, in which- Figure 1, sheet 1, represents the front side of anordinary loom, having our improvements applied thereto.

Flligure 1, a plan of detached parts connected therewit Figures 2 and 3, sheet 2, opposite transverse sections of g. 1, the former on the lineA B, and the latter on the line C D thereof.

y Figure 4 represents a rear-side view of that portion .ofthe loom where our improvements are applied, the

same being shown in this figure.

` Figure 5 represents a horizontal section on the line E F of figs. 2 or 4, as the sameappears after the stand I, gears N and P, and the incline shaft g and the yarn-beam A' have beenl removed purposely, to show the operative devices which are arranged -beneath the parts named above. 7

This invention relates-to that part of a loom which is called the let-oil", being a certain combination or combinations of devices arranged and connected with the yarn-beam and with some' other operating vmechanism for regulating the uniform delivery of warp vfrom the beam. i

, This invention has for its object to provide a positive let-off for looms, or a let-ofi' that will be so near positive in its operation and eli'ect that it would seem to be diicult to make it more positive, and at' the same time readily adjustable, to increase or diminish the tension ou the warp to any desired degree, and also to provide'for detachng the let-off mechanism from the operating mechanism, when the driving-belt is changed or shipped from the fast or tight drivingpulley tothe loose one, thereby preventing the escape of warp from the beam, when the filling has run out of the shuttle, and the belt is shifted to stop the loom and rene-w the filling.

In carrying' out our invention, the yarn-beam A', the cam-shaft IV, and the crank-shaft Z, the connecting-girts S and 'I, breast-beam V, and back-roll or bar X, may remain the same as on'almost any loom,

but on the carnshaft and near one en d of it, we sei cure a friction-disk, A, and at one end of this a hinged stand, B, the collar a of which loosely encircles the shaft.

The foot b of the hinged stand is fastened to the girt S, and the shank and collar are movable from or toward the disk A, by swinging'on a pivot, 4, seen in Iig. 5. Y

Tothe opposite side of the collar a one end of a crossshaft, d, is loosely connected.

The other end ot ythis shaft has a bearing or step .in the stand C, which is fastened on the back girtl.

Near the first-named end ofthe cross-shaft d, and on the same, we arrange a friction-Wheel, j, which bears or is pressed against the face of the disk A, and this wheel is adjustable for greater or less pressure by an adjusting screw-bar, D, the endsof which are set in centers or sockets in the side ot the box F of the cam-shaft, and in thesidc of the hinged stand On the central portion of the shaft d is a worm, E, which engages with a gear G, on a longitudinal. shaft supported in the box or barrel H projecting from one side of a stand,-I, which also forms a support for one end of `a gear-shaft, J, above the shaft rl, seen in tig. 5.

The opposite end of the shaft J is supported by an arm, h, projecting inward from the vertical rack-guide K, rising from the back stand 0. A

' A curved arm, L, extending downward andA outward from one end of the barrel H, forms a step for an inclined transverse shaft g, the upper portion of y which is held by a bearing-bracket, M, seen in tig. 4.

On the last-named shaft we arrange a bevel-gear, N, which slides on a spline, c, and rotates with the shaft.

The upp'er end of this bevel-gear has a necked hub and a serrated-or toothed collar, e, the former for moving the gear on the shaft, and the latter for stopping the motion of the gear and shaft when thrown out of gear'or from contact with the bevel-gear P, which is fastened to'oneeud of the shaft in the barrel- H, a toothed'stand, g1, being fastened to the end of the loom, in the right position to engage with the serrated upper edge of the collar e.

On the upper portion of the incline shaft is a worm,

R, which. meshes into the gear U on the end of the l yarn-beam A', and a wheel, B, furnishes means for turning the sha-ft g and the yarn-beam backward when desired.A p

On the shaft J we arrange two gears, Cl and G2. The former meshes into a horizontal rack, D, which is movable in the upper grooved side ofthe rearstand C, and the latter meshes into a vertical rack, K', which is movable in the grooved guide K.

On the top of the vertical rack-bar is a pressure or friction-pad, El, whichpre'sses against the body of yarn on the beam A', when actuated by the connecting mechanisms.

On one end of the rack-bar Dl we apply a'guide,

vn, which forks onto each end of the `friction-wheel f,

the bevel-gear N, the shaft g, and the worm R, which operates the gear U and thc yarn-beam to -unwnd the warp, and, in order to hasten or to retard the nnwinding action of the warp from the beam, a larger or a smaller gear is substituted for the gear G, or` a larger or smaller friction-wheel, j', may be applied to'l the shaft d, and thus operate the shaft d and the connected parts slower or faster; or for any slight change in the unwinding action of the warp the screw-bar D may be slackened, so as to relieve thcfriction between the wheel f and the face of the disk A; butthis is not advisable, and should only he resorted to temporarily.

The ,best inode of operating the device is to keep the wheel f pressingfhard against the face of the disk A, and this, in connection with the other operating and actuating devices, makes our invention a positive let-ofi', or so near positive that it would seem to be difficult tol make it more positive.

When the friction-wheel f is pressing against the face of the revolving disk A, and is operating as described, the tendency of said friction-wheel is outward, or toward the periphery of' the disk. Taking advan- Itage of this outward tendency or crowding action of the friction-wheel, the guide n is purposely forkedonto the wheel, and connected with the rack-bar D'.

By this means the crowding action of the frictionwheel is transferred to the lack-bar, thence to the gear C', and through the shaft J to the gear C2, and through this to the vertical rack and bar K' and. the pad El, and this keeps a constant frictional pressure ot' the pad `against the body of the warp or yarn on the beam, whether the bevelgears N and P are lneshed in together or thrown ont by sliding the former upward on the shaft y.

This last-named operation is only necessary when lthe belt is shifted from the fast or tight driving-pnlleys I' onto the loose one, m, when the loom is to be stopped to renew the lling in the shuttle.

At such times the lay or lathe will generally beat np, or perform from one to three or more backward and forward motions before its momentum is fully overcome.

This, in the use of theordinary let-oli', which allows the warp to unwind from the beam while the lay has motion, makesa thin place in the fabric, by drawing the web and the warp forward by the action ofthe take up, and when the lling has all run out of the sh ttle, by leaving partially blank space of one, two, or'more picks, whichwould have been full had the filling not run out of the shuttle.

Against the above-named diiiculties we have amply provided, `not only by the forked guide and the combination of horizontal and vertical racks, gears, and friction-pad, for retaining frictional pressure .on the warp and beam, but means for shipping, disengaging, or throwing the let-0H mechanism out of action when the driving-belt is shifted. Y l

The means above referred to are as follows:

A longitudinal rod, E?, is supported beneath the breast-beam by a depending hanger, E, and `by passing through the end-frame portion.

This rod extends Ato near the opposite end of the loom, andtherc connects with one arm of a bell-crank,

E, which is pivoted to a stand, E", secured to the in ner edge of .the beam V.

The other arm of the bell-crank passes through the top end of a lever, El, which swings on a screw, 2, passing through it into the end of the frame.

To the lower end ot' the last-named lever one end of a rod, E, is connected, and its other end connects with a clutch-lever, E?, whichy is pivotedjto the loom' end, and its lower end engages with the groovei), between the bevel-gear N and the serrated collar c, (sceV ig..2.)

lhe shipper-handle D is connected with one cud, 8, of the rod E, as clearly shown in fig. 1, and when the shipper is moved to run the driving-belt from the ,tight pulley onto the loose one, the rod t is moved l endwise, operating the bell-crank, the lever El, the rod E", and the clutch-lever E, which disengages the bevel-gear N from its mate P, and the unwinding motion ofthe yarn-beam ceases, and no backward or forward motion of the lay will canse the yarn-beam. to yturn or the warp to unwind therefrom, until the shipper is moved in the opposite direction, which slides the gear N downward on the incline shaft g, and brings the latter gear Vinto acting contact with the gear4 P, at the same instant the belt is shifted from the loose pulley onto the tight one, and the lay set in motion.

Then the gear N is tln'own upwardon the shaft g, the serrated rim of the collar c comes in contact with the stop g', and the rotary motion of the gear N is instantly suspended, and the yarn-beam is at rest, as before described.

It will be obvious that a roll may be substituted for the pressure-pad on the top end of the vertical rackbar K', and serve the same purpose of the pad, which we prefer.

Having described our invention,

What we claim as new, and desire to secure by Letters Patent, is

1. The combinatiom substantially as described,l of the friction-disk A and friction-'wheel f, the shaft d, worm E, gear G, bevel-gears N and l?, shaft g, and

worm It, with the gear U of the yarn-beam, altar-N.

ranged and operating in the manner and for the purpose set forth.

2. Thehinged stand B, in combination with the shaft d and friction-wheel f and with the disk A, as described. l

3. The adjustable screw-bar D, in combination with the hinged stand B, in the manner and for the purpose specified.

4. The combination, snbstantiallyas described, of the disk-A, wheel f, forked gnide'n, rack D, gears C and Crack K', and friction-pad El, or its equivalent, with the yarn-beam, all arranged and operatingfin the manner and for the purpose specified.

5. The forked guide n, in combination with the rack Dl and friction-wheel f, and with the gear G1, shaft J, gear .02, vertical' rack K', andpad El, all arranged and operating substantially in the manner and for the purpose set forth.

6. The combination, substantially as described, of the stand I, barrel bearing H, and curved arm L, which 4serve as supports for the gears P and G and their shaft, for one end of the shaftJ, and fora step for the inclined shaft g, as set forth.

7. The combination, substantially as described, of the rear stand'O, havinga shaft-supporting arm, h, land guides for the rack-bars Dl .and K', and a step for the shaft d, as set forth. `1 Y 8. The combination withv the shipper D4 of therod E, the bell-crankv E5, the lever E",the rod E, and the lever l, with the necked gea'rN, and the stop g', all combined, arranged, and operating substantially in themanner described, to release the let-off and allow the unwinding action of the yarn-beam to cease, and to return such partsto action oroperation. Y

9. The combination of the shipper D", the rodEl',

bell-crankvE, lever E1, rod E", lever El, shaft g, splincd and sliding gear N, toothed rim e, stop g', worm R,

gear U, the friction-pad El and rack K', and its conneetions, all arranged and operating substantially as described, for the purpose of regulating or controlling and stopping' and restoring the unwinding action of vthe yarn-beam.

10. The shipper D* and rod E, combined with the bell-crank lever E5, the lever L7, the connecting-rod E, and. the clutch-lever E, arranged and operating as set forth.

11. In connection with the disk A and wheel f, as- I described, the combination of two branches or sets of AWitnesses:

J. S. WHITREY, JOHN E. CRANE.

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