US379173A - Homee litchpield - Google Patents

Description

(No Model.)

H. LITOHPIELDL LET-OFF MECHANISM FOR LOOMS.

No. 379,173. Patented Mar-L6. 1888.

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HOMER LITOHFIELD, OF NORTH ADAMS, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO ENOOH H. BEER, OF SAME PLACE.

LET-OFF MECHANISM FOR LOOMS.

SPECIFICATION forming part of Letters Patent No. 379,173, dated March 6, 1888.

Application filed May 17, 1887. Serial No. 238,503.

To all whom it may concern:

Be it known that I, HOMER LITOHFIELD, a citizen of the United States, residing at North Adams, in the county of Berkshire and State of Massachusetts, have invented new and useful Improvements in Let-Off Mechanism for Looms, of which the following is a specification.

This invention relates to looms, and has for ID its object to provide novel means for automatically letting on the warp-yarn from the warpbeam. This object I accomplish by the combination of devices hereinafterdescribed and claimed, reference being made to the ac- I5 companying drawings, in which Figure 1 is a side elevation of a portion of a loom-frame, showing the invention applied thereto. Fig. 2 is a detail perspective of the curved shoe or yoke composing a part of the '20 friction let-oil devices.

In the drawings, the reference-numeral 1 designates a pulley upon a shaft, 3, which has a pinion, 1, engaging a gear-wheel, 1", on the shaft of the warp-beam 2, and 2 indi- 2 cates the whip-roll. The shaft of the warpbcam is supported in a loom-frame, 3, in the usual manner, or substantially so, and need not differ in essential particulars from those already known. The pulley is of any suitable 0 dimensions, is made of cast-iron or other metal, and has a perfectly smooth plain periphery, similar to that on ordinary belt'pulleys; but it may have flanges 011 both sides to keep the strap in place.

Overhanging the pulley 1 is a curved shoe or yoke, 45, having an inner concave surface, which is curved to approximate the surface of the pulley, which is partly surrounded by said shoe. One end, 5, of the latter is bent 4o outward and provided with an eye, 6, which receives a pivot-bolt, 7, passing into a part of the loom-frame, and giving suitable support to the shoe at that end, leaving the other end free to rise and fall, the latter end being weighted, as at 8, so that the shoe is normally drawn down toward the pulley 1. The whiproll 2 is provided with a projecting arm, 5, from which is suspended a vertical rod, 12, carrying at its lower end a weight, 8 and provided with a loop, 11, from which a finger, 10, projects into a vertical slot, 9, in the weighted free end of the curved shoe or yoke.

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Drawn around the face of the pulley 1, under the shoe or yoke, is a strap, 13, one end of which is fastened to a stud or projection, 14, upon the loom-frame 3, while the other end is secured to the free end of the shoe 4, the length of the strap being such that it may be subjected to tension upon the periphery of the pulley 1 by lowering the weighted end of the shoe, and such tension increased to the maximum, thereby bringing the curved face of the shoe down upon and into contact with the strap 13.

In operation the additional tension on the warp-yarn incident to the shedding motion produced by the usual loomliarncss-opcrati ng mechanisnifor example, as disclosed by Letters Patent No. 64,14t7acts on the whip-roll 2, raising the arm 5 with the weighted rod 12, thereby lifting the curved shoe or yoke4 and relieving the pulley 1 from the friction of the strap 13, thus allowingthe yarn beam to turn until sufficient warp is let oil. When this is effected, the weighted rod 12 descends and 5 moves the shoe or yoke toward the pulley 1, and thus draws the strap 13 into close frictional contact with said pulley to stop the let- Off and hold the yarn-beam firm, thereby producing tension on the warpyarn, as in the patent named.

I do not broadly claim an automatically-operated brake acting on a pulley for holding and releasing the warp-beam; but

WVhat I do claim is-- In a letoff mechanism for looms, the combination, with the loom-frame, a warp-beam, a pulley geared thereto, and the whip-roll, of a shoe or yoke overhanging the pulley and pivoted at one end to the loom-frame and pro- 0 vided at its free end with a weight and a slot,

a flexible friction-strap extending around the pulley under the shoe or yoke and fastened at one end to the loom-frame and at the other end to the weighted free end of the shoe or 5 yoke, and a weight-rod having a finger engaging the slot of the shoe or yoke to loosen and tighten the strap, substantially as described.

In testimony whereof I affiX my signature in presence of two witnesses.

HOMER LITGHFIELD.

Vitn esses:

JNo. E. DREW, ENOOH H. BEER.

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