US392284A - Let-off mechanism for looms - Google Patents

Description

(No Model.)

, P.OTT.

LET-OFF MECHANISM FOR LOOMS.

No. 392,284. Patented Nov. 6, 1888; I

WITNESSES: INVENTOR I QMM LK 7H: NuRms PETERS 00.. PHOTO-LITHOQ WASHINGTON, u. c:

U ITED STATES PATENT ()FFICE.

F tEDERIOK OTT, OF GLOUCESTER CITY, NEW JERSEY.

LET-OFF MECHANlSM FOR LOOMS.

EPECIPICATION forming part of Letters Patent No. 392,284, dated November 6, 1888.

Application filed February 26, 1887. Serial No. 228,920. (No modeLl.

To all whom iv may concern:

Be it known that l. FREDERICK Orr, a citizen of Germany, residing at Gloucester City, State of New Jersey, have invented certain new and useful Improvements in Let-Off Meolr anisms for Looms; and I dohcreby declare that the following is a full, clear, and exact description of my invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention has reference to looms used for weaving what are called crinkles or crinkled fabrics. In order to produce these it is necessary that some of the warpthreads should be let off faster than others.

My invention consists more especially in mechanism for accomplishing this, which may readily and cheaply be applied to looms of the ordinary construction.

In the accompanying drawings,Figure 1 represents in section the cloth -beam and two warp-beams of a'loom, the warps and woven fabric and the essential parts of my mechanism being shown in position. The remainder :of the loom is entirely omitted, not being necessary to an understanding of my invention. Fig. 2 shows portions of the frictionrollers A B, Fig. 1, and part of one of their supports on a larger scale as viewed from the back of the loom. Figs. 3,4, 5, and 6 show detail parts.

Grinkles is the-name commonly given to a cotton fabric having stripes which are alternately smooth and wrinkled or erinkled. This crinkling is obtained by weaving the fabric with two warps and causing the warp-threads which form the crinkled stripes to be let off faster than the warp of the rest of the fabric.

E, Fig. 1, is the plain warp-beam.

h is the cloth--beam, and O is asecond warpbeam containing the warp which is to form the crinkled part of the fabric.

It is necessary that the warps from the beam 0 should be delivered somewhat faster than those from beam E.

My invention consists of simple mechanism very easily attached to an ordinary loom, by which the feed of the warps from the beam 0 can be regulated and varied in accordance with any desired pattern by the use of a patternchain.

The plain warp from the beam E passes over the rod H and through the heddles in the usual manner. The rest of the warpfrom the beam 0. before passing under the rod I, describes a sigmoid curve around the rollers A 1-3. These rollers are quite heavy,and the upper one rests with all its weight upon the lower,for its axle does not rest in bearings,but plays within the slots formed by the U-shaped projections m upon the inside of the part of the frame Z, which carries the lower roller, A. The surface of these rollers is covered with a rough cloth. The result is that there is suffieient friction for the revolution of A to impart a corresponding motion to B, and also to firmly control the warp which passes around them, so that the motion of the warp from the beam 0 is absolutely dependent upon the motion of the roller A. This motion is obtained by a wormgear, A", at the end of the roller A engaging with an endless screw, 9, upon the shaft 9, which passes th rough the block it, fastened to the frame of the loom, and carries the ratchet-wheel f. This wheel is controlled in the usual way by the holding-ratchet h and the act-uati ng-pawl 6. This latter is fastened to the plate (Z, which rotates upon the axis of the shaft 9 in accordance with the motion of the rod to, which has free vertical play. Attached to the rod near its lower end is a finger, Z), secured in any desired position by a thumb-screw, 0*.

D is the main shalt of the loom. It carries the cam c. The finger is so adjusted as to be raised by the revolution of this cam, and, according as it is set higher or lower upon the 'rod,the amount of motion of the rod will vary and with it the revolution of the plate d, and consequently the number ofdents of theratchet which are passed over each time by the pawl (2; hence the motion of the roller A, and therefore of the warp from the beam 0, is varied at will by placing the finger b higher or lower upon the rod o. If it is raised above a certain point, there will be no let-off motion at all.

YVhen it is desired that the 1etoff motion shall be constant, this is all that is required. W hen it is desired that it shall vary according to a pattern, a pattern-chain must be used. This is shown in position at M, Fig. 1. It is carried by a shaft,K, which obtains its motion by a chain-belt, K, either from the main shaft or from any convenient part of the loom, in

accordance with the rapidity of rotation desired. The bobs or risers of this patternehain play against the projecting end of the finger b. \Vhen they raise it, the amount of motion given to it by the cam c is decreased or reduced to nothingaecording to the size of the riser. They may be thus made to produce a stripe alternately wrinkled and smooth.

Having thus described my invention, I claim 1. The combination of the warp-beam (J, the friction-rollers A B,ithe rod 1 geared to one of them by an endless screw and cog, the ratchet-wheelf upon said rod, the oscillating plate d, having a pawl engaging the ratchet-wheel, 15 the rod a, the adjustable finger Z) upon said rod, and the cam c.

2. The combination of the warp-beam G,the friction-rollers A I the' rod 9, geared to one of them by an endless screwand cog, the ratchet-wheel f upon said rod, the oscillating plate (I, having a pawl engaging the ratchet-wheel, the rod to, the adjustable finger b upon said rod, theeam c, and the pattern-chain M.

Witnesses:

A than!) S. Ml 1.1.nn, J. H. Bnnl,

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