US2076270A - Method of making covered elastic threads - Google Patents

Description

Aprlfl 6, 1937. T HARR|$ 2,076,270

METHOD OF MAKING COVERED ELASTIC THREADS Filed Aug. 15, 1955 2 Sheets-Sheet 1 mum" ATTORNEYS.

April 6, 1937.. T. HARRIS 2,076,270

METHOD OF MAKING COVERED ELASTIC THREADS Filed Aug. 15, 1935 '2 Sheets-Sheet 2 IINVENTOR. .7 %o/fiaz.s z czr/uris A TTORNEYS.

Patented Apr. 6, 1937 v h i UNITED STATES PATENT- OFFICE MErnonor na iiggvsann msrrc Thomas Harris, Providence, R. L, assignor to Harris Textile Machinery Corporation, a-

corporation of Rhode Island Application August 15, 1935, Serial No. 36,300

1 Claims. (01. 117-35) i This invention relates to covered elastic threads Fig. '7. is an elevation of a fragmental portion and the method of making the same; and has of the covered thread. for one of its objects a method by which an im- Commercial elastic yarn usually consists of a proved elastic thread may be, made which will rubber core about which there is helically wrapped 5 be more completely covered and yet will have atwisted thread of fibrous material. Thistwisted 5 more freedom of expansion and contraction than thread is wrapped about the core when the'core is one which is covered by a twister thread wrapped stretched and prevents contraction of the thread about an elastic core. from its original. size to leave the core constantly Another object of the invention is the method under tension. on the other hand, if the thread by which untwisted fibers may be positioned about were not stretched to its limit when covered, this 10 an elastic core and securely held thereon. covering will restrict the thread to a certain Another object of the invention is the utiliza amount and prevent it from stretching to the tion of a method by which the covering! mags b: fgielnthiit wouldwithout thefcoverngt Furthrer formed from a sin 1e end or a plurality 0 en 0 5, spaces are usually orme ween e fibrous material ei rtending through the same detwisted thread which covers the rubber core when 15 livery. rolls and wrapped either singly or in multistretched and also frequently when contracted; pie about an elastic core, without having been in 01318; Fiat a margedimprovedrmthreadfiitnay previously, separately twisted. e orme ve pro 8. cove g o ers Another object of the invention is a tinaethog gIhich hanfrbgei: refalativeg'1r gytgtigfiigg by which the usual drafting frame may use eusual a g rame o w c e s 20 and the elastic core merely introduced to be are delivered and introduce into this machine a delivered through the rolls which deliver the atcore of rubber which may be passed through the as i tt d iiifi 31 fif iis 2 1? afifi um d witt thitflvifi 3 a d asi is o e p r0 0 e a fig; 31 o? 3 1 s $125M desired. bers and then cause the untwisted fibers as they 25 Another object of the invention is the stretchare delivered from the drafting frame and while ing of an elastic core simultaneously with the atin the usual process of being twisted into a thread tenuation of the yarn used for covering the core to at the same time be twisted about a rubber core and in some instances by the same means as that which may be stretched as desired and when used for operating upon the covering yarn. contraction takes place I have a more completely w' t in covered core and one in which there is more freeith these and other objects in view, e ven d to both stretching and contracting than tion consists of certain novel featuresof conw i e re of core is covered with a previously twisted struction as W111 be more fully gg thread which is of such strength as to restrict a particular-1y minted the P and bind the ,rubber limiting its stretching and the accompanying. drawings contracting, and I may use for my covering either Fig. 1 is a sectional view looking endwise of a a single end drafted fibers or a plurality of spinning frame and showing the creel, the draftends of fibers depending upon certain results ing rolls and the ring and traveler for operating which I desire; and the f llowi g is a more 40 P the finished Yam; tailed description of the present embodiment o 4 I 2 is a enlarged sectimal View similar this invention illustrating the preferred means Figure 1, showing the drafting rolls and clearer b m th adymtageous results may b board; accomplished. r

Fig. 3 is a view similar to'Figure 2 showing an with Leefinge to 21580153128252]! geziglnvais additional set of rolls; a stand draf Fig. 4 is a view similar to Figure 2 of a modified Pairs 01 T0118 receiving P s 0 '0 II.

h bbe d intermediate pairs of rolls IS. A cleaning board amqgemeI-m f t e m r core an H is shown in engagement with the upper rolls. showing twlst-t ere 1 i sh I A usual weighting means for the rolls is pro- 5 is a dlagrammanc top p an v ew vided, there being shown only the common weight 50 the arrangelnent of the rolls and the plum y it for applying pressure to the front or delivery 0f ends passmg therethrtugh; 'pairs of rolls II which is positioned beneath the 6 is a WP P v Similar. to Figure 5 platform [5. upon which the standards in of the of a diagrammatic formation showing a single 'frame'are t d, end of covering thread; I The usual creel, consisting of decks l1, II is 55 shown in Figure at 23 naked rubber designated 26 superimposed above the platform It, supports the supply packages ll, I8, l9 and of non-elastic covering material and also the supply packages 28 and 22 of elastic material for each of the frames, it being understood that there are a plurality of the ends supplied through different rolls or roll sections along the length of the frame.

The showing in Figure 1 illustrates a pair of ends which are more clearly diagrammatically and 24, being drawn from a pair of packages such as H and I8 through a trumpet 25 and passing between the sets of the upper and lower roll sections i i, l2 and it where draft occurs; while the elastic core of is supplied from a package such as2l and is so arranged as to pass beneath the intermediate pairs of nip rolls It and then through the delivery pairs of nip rolls ll from which last pair of nip rolls the entire strand is twisted. There is more tension upon the rubber than upon the non-elastic fibers, causing the non-elastic fibers to be twisted about the rubber as a core in such a manner as to completely cover the same as at 40 in Figures 3, 4 and '7. This twist takes place between the nip oi the delivery roll Ii and the traveler 2'5 on the ring 28 mounted on the rail 29, which ring encircles a bobbin and by the usual traverse motion of this rail 29 the thread is caused to be laid upon the bobbin 30 in the usual manner. The spindle for the bobbin 30 is driven by a belt 3i from a drum 32.

In order to suitably guide the non-elastic strand which is to be attenuated through the rolls, I provide a guide 33 at the desired elevation just ahead of the trumpet 25, while a guide 36 is provided for the naked rubber core which may be so arranged as to cause the rubber to clear contact with the lower receiving roll l2 and by reason of the provision of another rod 35 between the lower rolls of the pairs l2 and it, see Figure 2 for a large showing of this structure shown in Figure 1, the rubber core will clear a large portion of the surface of the lower intermediate roll. By this arrangement the non-elastic fibers as they are attenuated at the time of their being twisted are twisted about the rubber core rather than being previously twisted and then wound upon a rubber core as is usual. By passing the rubber core 26 through the pairs of rolls l3 and l Lit is placed under the desired degree of stretch just prior to its being covered with the untwisted fibers.

This rubber core 26 instead of being passed through the pairs of rolls l3 and l l, as shown in Figures 1, 2 and 4, may be passed between a separate and distinct pair of nip rolls designated 36, 3?, in Figure 3, which may be driven at a different rate than the pairs of rolls it so as to provide a different stretch in the rubber than could be afforded by the same rolls as it and ii in Figure 2, which are used to attenuate the yarn, or in some cases the rubber may be supplied directly to the delivery rolls with the elimination of rolls 36 and 37 and without stretching it by means of rolls in any manner, see Figure 4.

The covering is supplied through one trumpet. either in the form of a single end or a pair of ends 23 and 24, or any desired number of ends, the combined amount being that which is desired for the thickness of covering on the elastic core when finished.

In Figure 6, I have illustrated a single end 26 utilized with a single core of rubber 26 which for most purposes is desirable as I have found that a sinale end of the desired weight is better than twist being placed in twoends of half the weight and the single end will provide a more compact covering than where the two ends are used as it seems in the use of two ends that the rubber tends to separate the two ends of covering, causing spaces to be formed along the length, whereas when a single strand is used it wraps more tightly about the rubber core and provides a better covered yarn which is more desirable for most purposes.

The non-elastic strands as they come through the drafting rolls are relatively untwisted, the the strand between the nip of the delivery pair of rolls ii and the traveler. However, at the same time the twist occurs in the cover a twist will also be placed in the rubber core and as it is frequently desirable to have no twist in the rubber core, or a very slight amount of twist, I will twist the rubber core in the opposite direction the same number of turns which would be placed in it between the pair of rolls ii and the traveler, so that the twist will balance and there will be no twist in the rubber core in the finished product, or if I wish a little twist I may vary this amount of twist previously put into the rubber core to obtain the desired result.

Thus by my method of operation, I am enabled to utilize the ordinary drafting machine and in= stead of first twisting the fibers which come through the drafting machine and then wrapping, them about a rubber core, I will wrap the fibers directly around the rubber core previous to the twisting, the twisting all taking place in wrapping them about the core; and by this method I am enabled to provide a thread which is more flexible in its extension and contraction than threads which have heretofore been formed of twisted non-elastic fibers, and yet my thread is one which is more completely covered and thus one which is more desirable for knitting, weaving, braiding or for other purposes of use.

The foregoing description is directed solely towards the construction illustrated, but I desire it to be understood that I reserve the privilege of resorting to all the mechanical changes to which the device is susceptible, the invention being defined and limited only by the terms of the appended claims.

I claim:

1. The method of forming a covered elastic thread, which consists in attenuating non-elastic fibers and by the same means stretching an elastic strand, and then twisting said non-elastic fibers and elastic strand in a manner to cause the nonelastic fibers to twist about said elastic strand and cover the same.

2. The method of forming a covered elastic thread, which consists in attenuating non-elastic fibers and by the same means attenuating an elastic strand, and then twisting said non-elastic fibers and elastic strand and maintaining them under such relative tensions as to cause the nonelastic fibers to twist about said elastic strand and cover the same.

3. The method of forming a covered elastic thread, which consists in attenuating a plurality of non-elastic fibers and by the same means stretching an elastic strand, and then twisting said non-elastic fibers and elastic strand and maintaining them under such relative tensions as to cause the non-elastic fibers to twist about said elastic strand and cover the same.

4. The method of forming a covered elastic thread comprising a tensioned twisted elastic strand having an outer covering of attenuated non-elastic fibers which consists in attenuating the non-elastic fibers and without frictionally holding the elastic strand to tension the same, and by the same means positively controlling and 5 stretching the elastic strand, and then twisting said non-elastic fibers and the elastic strand in a manner to cause the non-elastic fibers to twist about said elastic strand and cover the same.

5. The method of forming a covered elastic 10 thread, which consists in passing a sliver of raw non-elastic fibers and an elastic strand between separated pairs of nip rolls which are in nipping engagement with the non-elastic fibers and the elastic strand, attenuating the non-elastic fibers 15 during passage between one pair of the nip rolls and simultaneously elongating the elastic strand by passage between another pair of nip rolls, and thereafter twisting said non-elastic fibers and elastic strand in a manner to cause the non- 20 elastic fibers to twist about said elastic strand and cover the same.

6. The method of forming a covered elastic thread, which consists in passing a plurality of ends of loose untwisted non-elastic fibers and an elastic strand between separated pairs of nip rolls which are in nipping engagement with the non elastic fibers and the elastic strand, attenuating the non-elastic fibers during passage between one pair of the nip rolls and simultaneously elongating the elastic strand by passage between another pair of nip rolls, and thereafter twisting said nonelastic fibers and elastic strand in a manner to cause the non-elastic fibers to twist about said elastic strand and cover the same.

7. The method of forming a covered elastic thread, which consists in pulling a strand of loose untwisted non-elastic fibers and an elastic strand by retarding each strand at a plurality of separated points simultaneously and at points spaced from each strand supp y, said points for each strand being different to ttenuate the nonelastic fibers and at the same time to provide a desired stretch in the elastic strand, and then twisting the attenuated and stretched strands at the final nip point in a manner so as to cause the non-elastic fibers to twist about said elastic strand and cover the same.

I THOMAS HARRIS.

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