US1245290A - Let-off mechanism for looms. - Google Patents

Description

1. wARuR0N.` LET-OFF MECHANISM FOR LUOMS.

APPLICATION EILED FEB. 1.6. 19th 1,245,290. mma Nov. 6, 1917.

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I. wAIIBURmN.

LET-OFF MECHANISM FOR LOOMS. APPLICATION FILED FEB. I6. |911.

1 ,245,2901, I Patented Nov. 6,1917'.

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1,245,290. Patented Nov. 6, 191?.

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UNITED STATES PATENT oEEicE.

J CHN WABBUBTON, 0F PATTERSON, NEW JERSEY, ASSIGN-'R 0F ONE-HALF T0 DANIEL WARD, 0l' PATEBSQN, NEW JERSEY.

i A LET-OFF MECHAN'ISM 'FOB LOOKS.

pecication of Letters Patent.

Application led February 18, 1917. Serial No. 148,967.

To all whom z't may concern:

Be it known that I, JOHN WARBUETON, a citizen of the United States, residin at Paterson, in the county of Passaic and tate of New Jersey, have invented certain new and useful lmprovementsin Let-Off Mechanisms for Looms, of which the following is a specification.

This invention relates to means for controlling the advance under tension of the :cloth and warp in a loom, and it has reference particularly to the so-called let-0H part of such means. I seek by this invention principally to obtain an equable tension on the warp under all conditions. For attaining this object the commonly employed expedient involves ropes or chains wound on the let-oli warp-supply beam and held tight by Weights, which are varied to suit the character of the goods being woven and other conditions. But, especially where the weights require to be heavy, such means develops failure to produce the desired condition of absolute constancy of tension; for instance, if ropes are employed, they will exert diiierent degrees of resistance to rotation of the beam according as they absorb more or less humidity from the atmosphere; in any case, such means is unreliable, the action of the beam beine' alternate dwells and slips, which lead to shiers (2. e., undue spacing of the weft and other imperfections in the cloth.

My invention contemplates a novel combination of parts whereby, given means to take up the warp at a denite rate of advance,

the warp is let oi at a rate different from that at which it is taken up and is at the -same time held taut,the part of the combination which causes the warp to be held taut governing the part which eEects the letting oif so that from time to time the difference between the rate of letting oi and the rate of taking up is compensated for; in the construction herein shown and described 'by way of illustration, the wfarp is let ofi faster than it is taken up, and the com ensation involves stopping the let-off actlon from time to'time while the take-up continues.

In the accompanying drawings, in which Figure l is a side elevation of a loom embodying my invention; K

Fig. 2 is a rear elevation of the improved mechanism;

Fig, 3 is a side elevation, partlyin sectlon;

4r is a plan view; l

Fig. 5 1s a plan view like Fig. d excepting that the arts are in the position that they occupy w en the warp is let back;

F1g. 6 is an inside elevation of a fragment of pawl 'w and its actuating lever; and,

Fig. 7 is a sectional view 'on the line 7 7 of Fig. 5.

. ln the loom frame a there are a take-up means a hatten structure c equipped with a reed @Z and a shuttle or shuttles and picklng mechanism therefor (not shown); and means e to drive the take-up mechanism at a deiinite take-up rate.

Two stands f form a rearwardly projecting part of the frame a. They acrd a bearlng for a shaft g having keyed thereto two upwardly proJecting arms z.,-in which is lournaled the warp-supply or let-od beam @,-and a rearwardly projecting arm j; parts g, It and j form in eiiect a ll-crank lever.

J ournaled in frame a are two bell-crank levers equipped with weights Zand connected with the trunnions links fm., so that levers g-ib-j and the levers la move 'together` on their respective fulcra.

There is a ratchet wheel o journaled on shaft g, and a system of gearingp, g r and c connectlng the ratchet wheel with the beam, the member p of such gearing being fast with the ratchet wheel, the members Patented Nov. 6, 1917.

of the beam by g-Jr thereof fixed to rotate together on a .the idle end of the pawl and adapted to retract it when the lever swings to the left. For actuating pawl w there is ulcrumed in bar u another lever y adapted to strike a lug fw on pawl fw when the lever swings to the right and retract the pawl. The levers arey connected by a link e so as to swing together on their ulcra, and they are made a golng part of the loom by being connected i with a crankc on the'batten structure e by a pitman 2. There is thus produced an escapement means which, with the levers y kept oscillating and assuming there is a rotating influence belng exerted on the ratchet wheel, results in the ratchet wheel and hence the beam rotating step by step in the direction to deliver the warp; the parts are timed so that the rate of delivery of the warp is different from that of its taking up by the take-up mechanism, in the present case at a faster rate. The fulcrumvof the lever y is a stud 3 (as shown, also the ivot for pawl lw) and the lever is shiftable t ereon by virtue ofa slot y which receives it and allows the lever to descend to a position where instead of continuing to strike the pawl a recess y2 formed therein will oppose the lug w on the pawl 'and the pawl will remain unretracted. Lever y is carried by a stirrup piece 4 which is pivotallypendent from arm j and has its lower end turned oif and penetrated by a rod 5 and interposed between two springs 6 coiled around lever, which support the rod (Figs. 6 and 7).

Assume the position of the parts to be as shown in Fi 3, and the loom to be stopped: The freely iftable means g, 1' and i, under the pressure of the train of parts Z, k, m, h, g and y' is exerting a tautening influence on warp A, the beam i beln held against rotation to unwind the war ecause geared with the ratchet wheel, which is locked by one of the pawls. If the loom be now started, the pawls will free the ratchet wheel step by step at a faster rate than the warp 1s taken up, in consequence of vwhich the means Z, la, m, h g and 7' will lforce the beam back, which wi depress the lever y until nally its recess y2 opposes the lug w', so

that the lever will cease to withdraw the pawl fw; this hiatus in the retracting movements of the pawl may endure for one or more oscillations of t e levers, but since pawl fw remains holding the ratchet wheel and only pawl fv continues in motion, it will terminate as soon as the take up means has returned the beam forward and consequently elevated the lever y to the position where it will again actuate pawl w, whereupon the warp will again be delivered at a rate in excess of its taking up, and so on. It will be observed that always the tension remains absolutely equable.

If it should be necessary toadvance the warp for any purpose to bring the fell of the cloth forward of its normal position (indicated by arrow B in Fig. 1), or if due to a smash it be forced forward, or if it is necessary to let back the warp, the abnormal movement of stirrup 4 incident thereto is taken up by one or the other of the s rings 6. Aume the warp to be advanced, or instance, so as to leavea cut-olf mark in the the rodbetween two lugs 7 on thetion of said beam includin cloth byk absence of filling, the parts h, j 4would be tilted forward, which w0u l compress upper spring 6; the mechanism, on being now set in motion, would dellver the warp at a rate exceeding its taking up until said sprin became restored to normal condition an the lever y thereupon falls suficiently to clear the pawl w and cease to actuate it. Conversely, assume the warp to be let back (Fig. 5), lower sprin 6 would be compressed; on setting the mec anism in motion, since pawl 'w is now idle due to lug lw of pawl w being opposed to it, the beam remains held against rotation until the takeup, through the warp, has drawn it forward and consequently elevated lever y to such position that in vibrating it will again put pawl w in motion.

I do not wish to be limited to the details of construction herein set forth, what I claim being:

1. In combination, with a take-up mechanism, a let-off mechanism including a freely shiftable warp-tautening rotary warp-supply beam and means, controlled by the shifting beam, for controlling the letting-off rotation of the beam, said means including a rotary element connected to rotate with ,the beam and a going ste -by-step means controlling the rotation o said element.

2. In combination, with a take-up mechanism, a let-off mechanism including a freely shiftable warp-tautening rotary warp-sugiply beam and means, controlled by the shi ing beam, for controlling the letting-off rotation of the beam, said means including a Y rotary element connected to rotate with the beam, a pair of check devices movable into and out of and normally held in checking relation to said element, and separate going instrumentalities to impart retracting movement to each of said devices.

3. -In combination, with a take-up mechanism, a let-olf mechanism including a shiftable fulcrumed warp-tautening structure having a warp-rotated beam, and means, controlled by the shifting fulcrumed structure, for controlling the rotation of said beam including a rotary element connected to rotate with the beam and a going stepby-step means controlling the rotation of said element.

4. In combination, with a take-up mechanism, a let-off mechanism including 'a shiftable fulcrumed` warp-tautening structure having a warp-rotated warp-supply beam,

and means, controlled by the shifting fulcrumed structure, for controlling the rotaa rotary element connected to rotate wit the beam and a going step-by-step means controlling the rotation of said element.

5. In combination, with a take-up mechanism, a let-off mechanism including a shiftable ,fulcrumed warp-tautening structure having a warp-rotated beam, and means,

controlled by the shifting fulcrumed structure, for controlling the rotation of said beam including a rotary element journaled concentric with the fulcrum of said structure and connected to rotate with the beam and a going step-by-step means controlling the rotation of said element.

6. In combination, with a take-up mechanism, a let-oil' mechanism including a shiftable, fulcrumed Warp-tautening structure having a Warp-rotated Warp-supply beam, and means, controlled by the shifting fulcrumed structure, for controlling the rotation of said beam includin a rotary element journaled concentric Wlth the fulcrum of said structure andv connected to .rotate with the beam and a going step-by-step means controlling the rotation of said element. Y

7. In combination, With the frame, a take up mechanism arranged therein and a letoff mechanism including a shiftable upstanding Warp-tautening structure having a Warp-rotated beam and ulcrumed in the frame with its axis parallel to the beam, means normally acting to move said structure relatively away from the take-up mechanism, and means, controlled by the shifting Warp-tautening structure, to control the rota-tion of the beam.

8. In combination, with the frame, a takeup mechanism arranged therein and a leto" mechanism including a shiftable upstanding Warp tautening structure having a Warp-rotated beam and fulcrumed in the frame with its axis parallel to the beam, a rotary element journaled in the frame concentric with said axis and connected to rotate with the beam, and means, controlled by the shifting Warp-tautening structure, to control the rotation of said element.

In testimony whereof I aiix m si ature.

JOI-IN WARB IIFON.

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