US475595A - Island - Google Patents

Description

(No Model.)

JLMO RTON. LET-OFF MECHANISM FOR LOOMS.

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Patented May 24, 1892.

INVENTUR mws:

NORRIS rrrzns 20., morb-umon WASKINGTO STATES PATENT OFFICE.

JAMES MORTON, OF VALLEY FALLS, ASSIGNOR TO THE GEO. \V. STAFFORD MANUFACTURING COMPANY, OF PROVIDENCE, RHODE ISLAND.

LET-OFF MECHANISM FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 475,595, dated May 24, 1892.

Application filed October 2, 1890. Serial No. 366,809. (No model.) Patented in England October 22, 1890, No. 16,865.

To all whom it may concern: The warp-beam shown at O has the gear Be it known that I, JAMES MORTON, of Valformed on the head thereof or connected thereley Falls, in the county of Providence and with. The pinion which engages with the State of Rhode Island, have invented certain gear 0 is shown at 19 this pinion being fixed 55 newand usefulImprovementsinLet-OffMechupon the shaft of the gear 13. Into the gear anism for Looms; and I do hereby declare that p meshes the pinion 0, which is connected or the following is a full,clear, and exact descripformed in one with the friction-pulley j, the tion thereof, reference beinghad to the accomsaid pinion and pulley turning together upon pan ying drawings, and to the letters and ting the stud e, projecting outward from the lever 60 1o ures of reference marked thereon, which form h. Lever h is pivoted upon the stud 727, made a part of this specification. fast in the loom-frame, and the part thereof This invention (for which I have received adjacent to the stud eis widened and has piv- Letters Patent in Great Britain, No. 16,865, oted thereto two pawls w, the points of these dated October 22, 1890) relates to the devices pawls resting upon and engaging with the 65 I 5 or mechanisms which are called let-off moreverselydirected ratchetteeth which tions for looms, and which are applied to are formed upon the interior of pulley j. looms for the purpose of regulating the ten- The periphery of pulley j is grooved at f for sion and the delivery or supply of the warpthe reception of friction band or strap f, threads during the operation of weaving. which band or strap passes partly around the 70 My invention consists in a novel and imsaid pulley and has the end of its upper proved construction and combination of the length connected with the upper arm of a ledevices constitutingalet-off motion for looms, ver 1), while the end of the lower length or the same being intended to maintain an even portion of the band is connected with the rod tension on the warp during the weaving and d, this rod (1 being at its forward end con- 75 maintain a proper resistance to the beating nected with the lower arm of lever b. The up of the weft or filling, and also to provide upper length of band or strap f is formed in for the proper delivery of the warp from the part of a spring g, which is employed for the warp-beam as the weaving progresses. purpose of holding the band tight around the The invention will first be described with pulley j. The rear end of the rod cl is con- 80 reference to the accompanying drawings, and nected to an arm a, projecting downwardly then be particularly pointed out and disfrom the shaft (1. of the whip-roll a, the said tinctly defined in the claims atthe close of this whip-roll having the wing thereof extended specification. forwardly from the shaft thereof. A pin on In the drawings, Figure 1 is a view in side the lower arm of the lever b enters a slot in 85 elevation of sufficient of a loom having my the link 0, which is pivoted to the lay-sword invention applied thereto to make clear the B. One end of a stud a (see Fig. 4c) enters a character and mode of operation of the latter, hole formed in lever 17 and is secured therein parts being removed or broken away to secure by screw 2. The other end of the said stud clearness. Fig. 2 is a view in side elevation, has a hearing at the inner end of the hollow c partly broken away, of the friction-pulley and hub of a bracket m, which is bolted to the connected pinion, the supporting-lever, the loom-frame, while at a point adjacent to the pawls carried by the said lever, the holdinglever b the stud has another bearing in abolbracket for the said lever, and the pivot of the ster if, set in the outer end of the opening in lever. Fig. 3 is a view in horizontal section the hub and secured therein by a screw '1). 95 on the plane indicated at ca x in Fig. 2. Fig. Within the hub the stud is surrounded by a 4 is a View in section, and Fig. 5 a View in spiral spring 7*, one end of which spring enside elevation of certain parts which will be ters a notch 3, formed in an enlargement or referred to fully hereinafter. collar 3, formed on the inner end of the stud,

One of the side frames of a loom is shown while the other end of the spring enters a 100 at A in Fig. 1, one of the lay-swords at B, the notch or slot 4 in the bolster t.

lay rock-shaft at B, and the fiy-wheel at D. The spring 7' acts with a tendency to bear thus to act.

m whenever it is necessary toadjustthetenthe lower arm of the lever 1) forward and through. the connections described operates to cause the whip-roll to bear upward against the warp-yarns passing over the same. At the same time the said spring, in acting to draw the rod d. forward, causes. the lower length or portion of band. f to bed'rawn forward in a manner which causes the teeth to on the interior of the friction-pulleyj to be held firmly against the pointsof. thepawlsww, these latter being mounted on pivots carried by lever h and serving to prevent rotation of the friction-pulley while the spring continues By thisaction upon the frictionpulley and whip-roll theproper-tensionon thewarp-yarns is maintained. As the weaving proceeds and the cloth is drawn-forward by the take-up,, the: strain on the'warp-ya-rns .will. increase andtend to. bear down the whiproll. When the whip roll is depressedflhe, arme.',,rod d,,and lower arm of lever b-will-be. carriedbackwardagainst thetension of spring '1', and as they are thuscarried backward=the band 1? will be drawn. upon in a; mannerto cause the firiction-pulley j andconnected im ion o-to be rotated, and thesaid. pinion 0 will operate: through: the, gearing described to partly turn the. warp-beamandl'et 01f apolition of. the warp-yarns. This canhappen, however, only when the lay: is: back. in its heat, for when the lay swings. fiorward the. link 6. Willa-ct todraw forward'positively the. lower arm. of lever b,.an;d: thereby" raise the: whip-roll andv hold the friction-pulley from turningby keeping theteeth. to of said; pulley pressed against thepawls w. The bolster t is intended to be rotatedlinthehub ofi bracket sionofi the spring '2". For thispurpose. it is provided with. a squared or hexagonal head fitted to-be engaged by a. suitable tool.

When it is desired to adj ustthe. tension'of. thespring, the screw v, by which thebolster is clamped in. position in the; hub of bracket m,.is.first loosened, then the-bolsteris turned in the required direction,,andfinally screw 0 is tightened again. The objeetin mounting frictiom-pulleyjand pinion 0 upon lever h is to enable piniono to be disengaged from gear 19 whenever it is desired to rotate the warpbeam by hand. The free end of the lever is formed as a handle to enable it to be conveniently grasped, and the plate 70', which is af- ,fixed to'the loom-frame, is formed with two notches. It? 70 one. above the other, into either of which the lever may be pressed, so as to hold the lever in either its raised or its depressed and normal position. I claim as my invention- 1. The combination, with the friction-pulley j and pinion 0 connected therewith, a train of gears adapted to be placed in gear connection 1 with thewarp-beam of a loom, the whip-roll having an arm a, the lay-sword,and the link '0, connected with thetla-y-sword, of the lever b, the rodd', connecting the arm a and the lever .b,rthestraprorband f, passing partly around the; friction-pulley and connected atits ends with the=saidlleverb and. rod (1, respectively,

the: stud/n, servingas a; pivot for leverband' thespring. r,.sur.rounding: the stud n andhav- .ingone end thereof connected therewith, all 3 snbstantiallyas and for. the purposes setforth. 2.. The combination,withathefriction-pulley ,j and pinion 0 connectedutherewi-th,.atrain' of gears adapted to beplacedjin gear'connection {witlrthe warp-beam of. aloom, theiWhip-roll havingan. arm 01/, the; lay-sword, and the link :c,,connected" with the lay-sword, of thelever b, therod d, connecting. the arm a! and the jlever b, the. band: or strap f, passing partly garonnd the firict-iompulley' and connected: at lits endswith the said lever band the said rod d, respectively,.the stud n, serving as a pivot. for leverb; the spring'r, surrounding I said stud and having oneend connected there- ;with,,and theadj ust'able bolster t, with which the; other end of the. saidspring is connected, T the said bolster having provisions for holding it inset position, substantially as andfor the purposes described.

JAMES MORTON.

Witnesses:

GEO. W. STAFFORD, J. A. VICKERY.

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