US1548995A - Let-off means for looms - Google Patents

Description

Aug. 11, 1925.

1,548,995 W. HARRIS LET-OFF MEANS FOR LQOMS Original Filed Dec. 14. 1925 WITNESS TTKG,

A TTORIVEY Patented Aug. 11, 1925.

UNITE ST'E'ES WILLIAM HARRIS, OF PATERSQN, NEW JERSEY.

LET-OFF MEANS FOR LOOMS.

Ap lication filed December 14, 1923, Serial No. 680,601. Renewed March 7, 1925.

To all whom 2'25 may concern Be it known that I, NumIAM Haunts, a citizen of the United States, residing at Paterson, in the county of Passaic and State of New Jersey, have invented certain new and useful Improvements in Let-Off Means for Looms, of which the following is a specification. y

In let-oft mechanisms for looms of the kind'in which. slip-friction is resorted to to ,control the rotation of the warp-beam (characterized usually by a rope wound around the beam head and carrying weights at its ends, the forward or lighter weight being adapted to contact with the floor at intervals to cause relaxation of the rope) there is the tendency for the beam to turn under the pull of the warp in a jerky fashion, due when analyzed to the braking element alternately adhering to the beam and allowing it to slip, and this tendency becomes an active factor in producing faulty fabrics in respects into which it is unnecessary to go in detail in this specification, since, this type of let-off mechanism being the one most commonly used, they are well known to those skilled in the art of weaving. Suffice it to say that many expedients have in practice been resorted to to alleviate the troublesome conditions that obtain when slip-friction is relied on to afford resistance to the rotation of the beam whereby to maintain the proper tension on the warp, none of which fully accomplishes the principal object under all the different conditions that prevail in practical weaving and most of which encumber the loom and require such skill and attention to obtain the best results as exceed the capacity of the ordinary loom attendant.

Instead of using slip-friction, which is responsible as stated for jerky rotary delivery movements of the beam, I arrange in permanent tractive engagement with a part of a rotary means to supply the warp a flexible attenuated device which extends from said part relatively reversely to the direction in which the warp extends from the beam or other element of said means on which it is wound and is connected to a paying-out means confined to move in synchrony with means (as the takeup of the loom) for exerting a pull on the warp, said connection being tensioned.

By this system the resistance to the rotation of the beam and hence to the advance of the warp is constantly present, sudden release-impulses thereof never ensuing, and a consequence no faults can occur in the weaving such as those attributable to let-oft mechanisms employing slip-friction as a medium of resistance to the delivery movements of the beam, and no special skill is required either to establish or to maintain the system in proper working order at all times and under all the different and varying conditions that are incident to weaving.

In the drawings,

Fig. 1 is a side elevation of a loom embodying my invention; and

Fig. 2 is a sectional view on the line 2-2, Fig. 1.

A supporting means is afforded by the loom frame a which has the usual means, as the breast-beam b and a roller 0, over which the warp A (having interwoven with it the weft or filling and so as to its forward portion being a part of the fabric B) is extended as usual. At the front of the loom is arranged a take-up mechanism of any usual form, the same being here represented by a sand roller. d and a cloth-beam e on which to wind up the part of the warp with which the weft or filling has been incorporated to form the fabric, the latter being maintained in a bend around the sand roller by two other rollers 7, as usual. The sand roller is kept from backward rotation by any suitable means, here shown as a holding paw d engaging a ratchet d fixed to r0- tate with the sand roller. It is not material to the present invention in what manner or what means the sand roller and beam e are rotated to advance and Wind up the fabric.

At the rear of the loom is journaled the warp beam 9. It has fixed on the end of one of its gudgeons h a double-flanged head which is arranged outward of the loom frame in the present case.

7' is the aforementioned attenuated flexible device (which may be a rope or chain) and Z2 Z: guides in engagement with which said device extends, the guides being here two peripherally grooved pulleys journaled in the upper part of the loom frame and projecting laterally therefrom.

The rearward end of the device is secured to the periphery of the head cl between its flanges, being wound more or less thereon in the direction reverse to the winding thereon of the warp.

The mentioned tensioning is obtained by means here in the form of a weight, being shown as comprising the carrier 0 having a pulley engaged in a bight or bend y" of device j between pulleys 7 and carrying one or more weights 9.

A double-flanged head 1 is shown fixed on the end of the sand roller shaft and having the other or forward end of the device wound thereon reversely to the direction in which the fabric extends around the sand roller. Therefore the device is continually and automatically paid out at one end while, during advance of the sheet of warp and fabric, itis wound up at the other, the tension means being active to exert a pull on both end portions of the warp. A bend such as j in the device j is not indispensable because as fast as said device is on the one hand taken up it is on the other hand paid out, unless, of course, (as in the case illustrated by the drawings) the winding up at 2' and the unwinding at r involve change of the wound mass in respect to diameter, when such a bend will be necessary to afford compeusation for the difference in the rates of advance of the two end portions of the device then exiting. ll hen the device becomes fully paid out from head r it may be uncoiled from head 7r having removed the weights) and recoiled on head r.

The means (Z may be regarded as means to exert a pull on the warp and the means r as a paying-out means confined to move in synchrony with the paying-out means and adapted to pay out said device when the first-named means is exerting a pull on the warp.

h loreover, while generally it will perhaps be best to apply the tensioning force so that it acts on a device such as j transversely thereof the invention is not correspondingly limited. Any tensioning connection as jg) connecting the paying-out means and a part of the rotary warp-supply means and having a portion thereof in permanent trac tive engagement with said part and extending therefrom relatively re-versely to the direction in which the warp extends from the element on which it is wound and being adapted to be paid. out by the paying-out means when the means to exert a pull on the warp is exerting such pull is to be regarded as falling within the scope of this invention. By the term permanent tractive engagement as herein used I mean a tractive engagement not permitting slippage.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a loom, the combination of a support, rotary means to supply the warp journaled in said support and including a rotary element on which the warp is wound, means to exert a pull on the warp and thereby unwind it from said element, causing rotation of the first means, a paying-out means con lined to move in synchrony with the second amed means independently of the warp, and a flexible tensioning connection connecting said paying-out means and a part of said rotary means and having a portion thereof in permanent tractive engagement with said part and extending therefrom relatively reversely to the direction in which the warp extends from said element and said connection being adapted to be paid out by the paying-out means when the second-named means is exerting a pull on the warp.

2. In a loom, the combination of a support, rotary means to supply the warp journaled in said support and including a rotary element on which the warp is wound, means to exert a pull on the warp and thereby unwind it from said element, causing rotation of the first means, a rotary payingout member confined to rotate in synchrony with the second-named means, and a flexible tensioning connection connecting said 1nember and a part of said rotary means and hav-- ing a portion thereof in permanent tractivc engagement with said part and extending therefrom relatively reversely to the direc tion in which the warp extends from said element and another portion thereof connected to said member and adapted to be paid out thereby when the second-named means is exerting a pull on the warp.

3. In a loom, the combination of a support, rotary means to supply the warp journaled in said support and including a rotary element on which the warp is wound, means to exert a pull on the warp and thereby unwind it from said element, causing rotation of the first means, a paying-out means confined to move in synchrony with the secondnamed means independently of the Warp, a flexible attenuated device connected with and adapted. to be paid out by the payingout means when the second-named means is exerting a pull on the warp and having a portion thereof arranged in permanent tractive engagen'lent with a part of said ro tary means and extending therefrom relatively r-evei'sely to the direction in which the warp extends from said element, and tension means acting on said device transversely thereof.

4. In a loom, the combination of a support, rotary means to supply the warp journaled in said support and including a rotary element on which the warp is wound, means to exert a pull on the warp and thereby unwind it from said element, causing rotation of the first means, a rotary paying-out meinber confined to rotate in synchrony with the second-named means, a flexible atenuated device having a portion thereof in permanent tractive engagement with a part of said rotary means and extending therefrom relatively reversely to the direction in which the warp extends from said element and another portion thereof arranged in permanent tractive engagement withsaid member and arranged to be paid out thereby when the second-named means is exerting a pull on the warp, and tension means acting on said device transversely thereof.

5. In a loom, the combination of a sup port, rotary means to supply the warp journaled in said support and including a rotary element on which the warp is wound, means to exert a pull on the warp and thereby un- Wind it from said element, causing rotation of the first means, a rotary paying-out means confined to rotate in synchrony with the sec ond-named means, and a tensioning connection in permanent tractive engagement with a part of the first means and a part of the paying-out means and imparting force to rotate the former part relatively contrary to the pull of the warp and to rotate the latter part in relatively the same direction as the warp is pulled.

In testimony whereof I afiix my signature.

WILLIAM HARRIS.

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