US416025A - wilkinson - Google Patents

Description

2 Sheets-Sheet 1.

(No Model) J. WILKINSON. LET-OFF MOTION FOR LOOMS.

No. 416,025. Patented Nov. 26, 1889.

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.2 SheetsSheet (No Model.)

J. WILKINSON. LET-OFF MOTION FOR LOOMS. 110.416.025. a Patented Nov. 26, 1889.

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UNITED STATES PATENT OFFICE.

J ABEZ .IVILKINSON, OF FALL RIVER, MASSACHUSETTS.

LET-OFF MOTION FOR LOOMS.

SPECIFICATION formingpart of Letters Patent No. 416,025, dated November 26, 1889.

Application filed August 13, 1888. Serial No. 282,502. (No model.)

To aZZ whom it may concern:

Be it known that I, JABEZ WILKINSON, of Fall River, in the county of'Bristol and State of Massachusetts, have invented certain new and useful Improvements in Let-Off Motions for Looms, of which the following is a specification.

My invention relates to let-01f motions for looms, and has for its object, first, the provision of improvements whereby the requisite quantity of warps for each shoot or pick may be delivered from the yarn-beam V at the time such pick is made; second, the provision of improvements whereby an even tension may be preserved on the warp from a full beam to the last round of warp thereon.

In bob-wire let-off motions, or such as employ a pallet and toothed wheel, the motion, when operated at all, is moved to the extent of one tooth of the wheel, and each of these movements effects the delivery from the yarn-beam of warp enough or from four to eight or more picks, resulting in the variation of the tension on the warp and a consequent variation of the texture of the cloth being woven. Again, as is well known, the tension on the warp varies as the amount of warp on the yarn beam varies, since with a full beam the warp being drawn off exerts a greater leverage, as it were, in turning the beam than when the latter is nearly empty. By my improvements, hereinafter fully described and claimed, these obj ections and difficulties are entirely overcome.

Reference is to be had to the accompanying drawings, and to the letters of reference marked thereon, forming a part of this specification, of which drawings- Figure 1 represents a rear view of a loom, or a portion of a loom, equipped with my invention. Fig. 2 is an end view of the same. Fig. 3 is a vertical sectional view taken on the line 00 of Fig, 1, looking in the direction of the arrow. Fig. 4 is a vertical sectional view taken on the line y y, Fig. 2. Figs.

-5 and 6 are detail views, hereinafter referred provided on its inner end with a pinion g,

engaging with a gear-wheel h, secured on the shaft of yarn-beam b, so that by the rotation of the yarn-beam the pulley (Z will also be rotated.

i designates a strap, one end of which is secured at j to a rotary hub k on a stud Z of a bracket m, adj ustably secured, as shown, to

one end of a rock-rod If, as hereinafter explained. From the point j the strap t' passes around the periphery of pulley (Z and around a curved spring a, secured to the hub k, and is at its opposite end secured at 0 to said hub.-

designates a lever attached at its inner end to the hub is and at its outer endpassing through a loop or slot formed in a strip se cured to the weight g on the lower end of a wire or rod 1', attached at its upper end to the outer end of vibrator-arm s.

\Vith this construction and arrangement of devices, when the lay (not shown) is back from the fell of the cloth 'or cloth-making point, the warp 10 will be sufficiently slack to permit the vibrator o to assume its normal position, and with the latter device in this position the outer end of arm .9, carrying Weight g, through the medium of rod or wire 7', will be allowed to fall, carrying with it the outer or free end of lever p, and so turning hub 7a, to which spring a is attached, as to tighten the band or strap 0' around the periphery of pulley cl and frictionally hold said pulley, and consequently the yarn-beam b, from turning. lVhen, however, the lay moves forward to beat up a pick or shoot of weft, the warp will be drawn quite taut over vibrator c, causing the latter to rock forward and to momentarily raise the outer end of arm 5, and, through the medium of its attached devices, operating in the direction the reverse of that just described, loosen friction-strap 11 on pulley (Z sufficiently to permit the latter to beam.

respond to the stress brought upon the yarnbeam by the warp and turn to an extent that will allow of the delivery or letting off of warp from the yarn-beam sufficient to compensate for the amount taken up by the shoot of weft put in. v

The degree of frictional resistance to the rotation of pulley d imparted by strap or band t can readily be regulated by the adj ustment of bracket m, to which the hub 7c is attached. The adj usting mechanism is shown in detail in Figs. 5 and 6. An arm having a longitudinal slot 25, extends at right angles from the rod 2, and an adj Listing-screw Z in the bracket m passes through and engages with the slot t.

As has already been explain ed, the warp is drawn offthe yarn-beam much more easily when the beam is full than when it is nearly empty, and to regulate or render even what would otherwise be an unequal tension resulting from this cause I arrange a rock-rod t in suitable bearings attached to the loom-frame below the yarn-beam, as shown, and secure the lower end of an arm to to said rod, providing the upper end with a roller 1 or it may be a pad adapted to rest on the warp on the yarn- (See Figs. 1, 3, and 4.) A spiral spring .2, surrounding rock-rod t and connected therewith and with the frame of the loom, serves to rock said rod, so as to keep roller 4; in contact with the warp on the warpbeam. As shown in Figs. 5 and 6, the stud Z,

on which is arranged the hub 70, is eccentrically connected with rock-rod 25 through the medium of bracket m, so that as the upper end of arm a is moved outward from the axis of the yarn-beam, as it will be when the yarn-beam is full, hub will be moved away from the axis of pulley (1, so as to tighten the strap about said pulley, and as the upperend of arm 14 moves inward toward the axis of the yarn-beam hub It will be moved toward the axis of pulley d, and so slacken the frictionstrap passing therearound, thus compensating for the increase in draft necessary to unwind the warps from the yarn-beam when the latter is nearly empty.

Having thus described my inven tion,what I claim is 1. The combination, with the vibrator and its arm, of a friction-pulley and its journalshaft, a pinion 011 said shaft, the yarn-beam, a gear 011 the yarn-beam engaging with said pinion, a strap surrounding the pulley to retard .its rotation, a hub j ournaled below said pulley and with which said strap is connected, the spring n, lever p, a connection from the vibrator-arm to said lever, and a weight attached to said connection, as set forth.

2. The combination, with the loom-frame and pulley d, of a bracket provided with a stud, a hub journaled on said stud and provided with a springn, afriction-strap passing around said pulley and spring and having an end secured to said hub, and a lever 1), secured at one end to said hub, the vibrator, a connection from the vibrator to said lever 17, and a weight, as set forth.

3. The combination, with the loom-frame, the vibrator, and its arm, of the pulley d, its shaft, a pinion on said shaft adapted to be engaged by the gear on ayarn-beam, a bracket provided with a stud, a hub j ournaled on said stud and provided with a spring, a frictionstrap passing about said pulley and having its ends secured to said hub, a lever 19, secured at one end to said hub, a Weight connected with the other end of said lever, and a rod or wire connecting said weight with the vibratorarm, as set forth.

4. The combination, with the loom-frame, of the rock-rod 25, arranged below the beam and having an eccentrically-mounted hub at its outer end, the pulley d, the strap surrounding the same and connected to said hub, the arm u, and the spring .2, the combination being and operating as set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, t'his 1st day of August, A. D. 1888.

JABEZ ILKINSON.

\Vitnesses:

HORDEN HOWARD, HENRY H. SHERMAN.

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