US2061020A

US2061020A - Method of and machine for balancing the twist of elastic yarn

Info

Publication number: US2061020A
Application number: US50666A
Authority: US
Inventors: Fayette D Chittenden; Kenneth J Rupprecht
Original assignee: Us Rubber Prod Inc
Current assignee: Uniroyal Inc
Priority date: 1935-11-20
Filing date: 1935-11-20
Publication date: 1936-11-17
Anticipated expiration: 1953-11-17

Description

Nov. 317, 11936. F. D. CHITTENDEN ET AL 2,061,020

METHOD OF AND MACHINE FOR BALANCING THE TWIST OF ELASTIC YARN Filed Nov. 20, 1935 WAX 7% ATTORNEY.

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Patented Nov. 17, 1936 UNITED STATES METHOIl OF AND MACHINE FOR BALANC-- ING THE TWIST OF ELASTIC YARN Fayette D. Chittenden, Providence, and Kenneth -.'i. Rupprecht, Harrington, R. L, assignors to United States Rubber Products, Inc., New York, N. Y., a corporation of Delaware Application November-'20, 1935,, Serial No. 50,666

3 Claims. (01. 117-26) This invention relates to a yarn rewinding machine for correcting the twist of an off-balance elastic yarn, and to a method of balancing the yarn.

Elastic yarn comprising a rubber core havin a covering of textile yarn spirally wound thereupon in one direction and a second covering of textile yarn spirally wound thereupon in an opposite direction is manufactured in large quantities. The rubber core is held by the covering yarns in a tensioned condition and as a result the elastic yarn tends to curl and kink under the contractive force of the stretched. core unless the oppositely wound spiral covers are so, applied that they exert a balanced actionupon the, core.

It is important that elastic yarn and particularly the finer sizes intended for use in shuttles or knitting machines be balanced when readyfor use so that a suspended free length thereof will hang straight and not tend to kink when free from tension, for if the yarn is unbalanced it will not work well in a shuttle or knitting machine.

In covering elastic yarn it is diflicult to always secure the desired balanced effect and it, has been the practice heretofore when the finished yarn was found tobe kinky or unbalanced to correct or reclaim the yarn by removing the .excess twist, the direction in which the yarn should be untwisted depending upon the direction in which the yarn is off-balance.

yarn over the, head of the spool. This operation removes one twist from the yarn for each revolution or coil of the yarn about the spool, but the repeated drawing of the yarn off the end of I one spool and winding it on another to correct the twist is time consuming,

The present invention therefore contemplates a machine for correcting the twist of off-balance elastic yam in aslngle operation instead of a number of winding operations as heretofore, and

an important feature of the invention resides in yarn-winding mechanism including a spool-supporting spindle and means for rotating the ,spindle and spool at a predetermined ratio tothe speed at which the yarn is pulled fromthe spool so as to'untwist the-yarn just enough'to tomcaits off-balance condition.

pull roll between the spindle-operateds mews u which whi h! W 4 a is operable to deliver the yarn to the :latterat substantially a constant tension. Other features of the invention andnovel combination of parts'in addition to theabove will be hereinafter described in connection with j the 5 accompanying drawing which illustrates one good practical form thereof. In the drawing:- Fig. 1 is a-diagrammatic side elevation of winding mechanismconstructed in accordance with 210 the present invention; Y N Fig. 2 is a frontelevation of the mechanism ofFig.1;. Eig. 3 is a view ofaportion of the yarn spool of Fig. 1 showing the kinked elastic yarn extending therefrom, part of the yarn being magnified to show the inner and outer spiral covering;

and

Fig. .4 is a view similar t Fig. 3 but sh ws the rubber core as provided with a single spiral cov- 0 ering.

In order to reclaim unbalanced elastic yarn by correcting its unbalanced condition in accordance with the present invention the off-balance yarn is wound on a spool such as l0 so that the yarn may be pulled over the head thereof, and

this spool is mounted upon a spindle II which is rotatably mounted in supporting means l2.

The elastic yarn I3 has beenshown in Fig. 3

as in an unbalanced kinky condition prior to having this condition corrected, and as here shown the elastic or rubber core l4 has spirally wound thereupon an inner cover of yarn l5 and outer cover of yarn IS. The present invention, however, may be employed to correct the unbalanced condition of other types of elastic yarn. The yarn I3 is drawn from the spool In in an axial direction and a fixed guide ii for the yarn is preferably provided near the upper end of the spool to guide the yarn and cause it to balloon as 40 it leaves the spool, as shown, so as to clear the head of the spool. The yarn i3 is shown as passing from the guide IT to a second guide I8,positioned below a yarn-tensioning'pulley l9 about which the yarn islooped as shown. The yarn passes from the pulley l9 through the fixed guide 20 to a guide 2| of the traversing bar 22, and then about the skein drum 23 which is driven at the desired surface speed by the drive roll 24.

The pulley. I9 is preferably driven at a surface Qsileed several times faster than the surface speed "of thedrum '23 andth'e slippage of the yarn on the r-.pulley'compensates for variations in elonga- .r,tion'of the'elastic yarn in spooling so that the yarn is delivered to the drum under constant tension.

The spool-supporting spindle ll may be driven by a belt 25 or otherwise but means should be provided for controlling the speed of this spindle relative to the speed at which the yarn is drawn off the spool H] by the winding mechanism, so that the present mechanism may be employed to vary the amount of twist that is to be removed from the yarn.

In reclaiming 0r correcting the twist of elastic yarn in accordance with the present invention the skeins or other packages of off-balance yarn may be sorted into batches according to the degree af balance. They are then spooled, that is, wound on spools such as H) and placed on the spindles II. The operator then adjusts the spindle to the proper speed for the batch on hand. It is found that the operator after some experience will be able to judge accurately the correct spindle speed for any batch of yarn to be balanced. The yarn when balanced will hang limp when tested.

As the yarn is drawn over the end of the spool ID by the rotation of the drum 23 one twist will be removed from the yarn I3 for each revolution of the spindle plus one turn for each wrap of yarn upon the spool, and as a result any desired number of twists can beremoved from the yarn in a single unwinding operation.

In Fig. 4 is shown a difierent type of elastic yarn comprising a rubber core 26 having spirally wound thereupon a single covering of yarn 21.

It is apparent that if the covering 21 is wound upon an untwisted core 26 the elastic yarn thus produced will be badly out of balance and will tend to kink as shown in Fig. 4. This condition, however, may be readily corrected upon the machine of Fig. 1 by so operating this machine that it will twist the core 26 and decrease the twist of the covering yarn 21 sufficiently to produce a balanced elastic yarn having a single spiral covering, the core being twisted in one direction and the covering in the oppposite direction in the balanced yarn.

eration, the important feature of both the method and apparatus being the rotation of the package at the proper speed as the yarn is drawn therefrom.

Having thus described our invention what we claim and desire to protect by Letters Patent is:

1. The method of correcting the twist of offbalance elastic yarn, which consists in winding the ofi-balance yarn in a package so that the yarn may be pulled endwise from the package as it is unwound therefrom, pulling the yarn endwise from said package, and rotating the package as the yarn is pulled therefrom at a rate to change the twist of the yarn by a plurality of twists for each turn unwound from the package.

2. The method of correcting the twist of offbalance elasticyarn,which consists in winding the off-balance yarn in a package so that the yarn may be pulled endwise from the package as it is unwound therefrom, pulling the yarn endwise from said package, and rotating said package as the yarn is pulled therefrom at a predetermined ratio to the speed at which the yarn is drawn from the package.

3. The method of correcting the twist of offbalanced elastic yarn formed of a rubber core having an inner cover helically wound thereupon in one direction and an outer cover helically wound thereupon in the opposite direction, which consists in winding the off-balanced yarn in a package so that the yarn may be pulled endwise from the package as it is unwound therefrom, pulling the yarn endwise from said package, and rotating said package as the yarn is pulled therefrom at a predetermined ratio to the speed at which the yarn is drawn from the package.

FAYETTE D. CHITTENDEN. KENNETH J. RUPPRECHT.