US14120A - Yakn-dkessikg fkame - Google Patents

Description

'Ll-Mis?? N. PETERS. PHOTO-LIYMOGRAPHEH, WASHINGTON D G Unir STS

YARN-DRESSING FRAME.

Specification of Letters Patent No.

To all whom t may concern.'

Be it known that I, ABNER J. SUTHER- LAND, of Lowell, in the county of Middlesex and Commonwealth of Massachusetts, have invented certain new and useful Improvements in the Friction Let-Off Motion of Yarn-Beams on Dressers and Similar Machines; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings and to the letters of reference marked thereon.

Figure l, represents the plan of a frame, holding a yarn beam which has my improved friction-let-off-motion attached. Fig. 2, is a front elevation of the same, and Fig. 3, is an end elevation of it.

Similar letters of reference in each of the several figures indicate corresponding parts.

The nature of my invention consists in the addition of such improvements to the common friction-let-o, as shall make it self regulating.

A, Figs. l, 2 and 3, represents the frame which supports the yarn beam. As my invention relates simply to the method of controlling the beam, it is unnecessary to show the whole machine on which the beam is used ;-therefore, this frame A may be considered as a detached portion of the frame of a dresser or similar machine.

B, is the beam with the yarn or war wound about it, and represented by blue lines.

C, is the friction strap, one end of which is fastened by means of a hook to the frame A. The other end, after being passed over the barrel of the beam, is attached to one end of a spiral spring D. The other end of this spring is fastened to the short arm of the regulating lever E. t

F, is a stand attached to the frame, and carrying a stud on which the lever E, vibrates.

fy, is the long arm of the lever E, and is provided at its extremity with a shoe, friction plate or roll, which presses against the roll of yarn, wound on the beam.

IVe will now suppose the beam to be full of yarn and the action of the machine to which it is attached begins to unwind it. It

is evident that if we allow the friction on 14,120, dated January 15, 1856.

the barrel of the beam to be the same, it will require a less amount of tension or stretch of the yarn or warp to revolve the beam on its axis when it is nearly or quite full, than when it is nearly empty,-because, while the force exerted on the barrel is the same, the force exerted by the yarn must be constantly increased on account of the loss of leverage, by the diminishing in the size of the roll as the yarn is unwound. But my improvements obviate this difficulty in the following manner, viz: 'When the beam is full of yarn the long arm y of the lever E is pressed down, and consequently the short arm, m, is also down, and causes the spring D, to exert its greatest force on the friction strap C. In this position then, when the yarn has its greatest advantage of leverage by reason of the beams being full, the spring is made to exert its greatest force on the friction strap C. Now when the beam is empty, or nearly so, this advantage is lost; but it is compensated for by a less amount of friction of th-e strap on the barrel; for, as the yarn unwinds, the end of the long arm of the lever E, pressing against the roll, rises; which causes the short arm to rise, and lessens the tension of the spring. Thus it will be seen that in the proportion by which the power of the yarn diminishes to overcome the friction, in just the same ratio the friction is diminished; so that the two forces are thus equalized throughout the whole unwinding of the yarn, and consequently an equal tension of the warp is maintained, which is very essential to the making of good and perfect cloth.

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

I claim the use and application of a lever or its equivalent, one end of which presses on the surface of the yarn wound about the beam, and to the other end of which, the friction spring is attached for the purpose and substantially as herein described.

I am aware that James and John Haworth obtained a patent in 1848 for a contrivance acting on the same principle as that above described; but that contrivance was applicable only to looms, and could not without material modieationbe applied to dressers. In Witness whereof I have hereunto set I do not claim the use of my let off motion my signature this 17th day of July A. D. as applied to looms, but only as applied to 1855. dressers and similar machines, excepting ABNER J. SUTI-IERLAND.

5 looms. I do not claim the friction strap, In presence o nor the spiral spring, as they have been used AARON S. HADLEY,

before. O. E. CUSHING.

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