US3686845A

US3686845A - Apparatus for producing a non-irregular twist yarn

Info

Publication number: US3686845A
Application number: US667144A
Authority: US
Inventors: Sadayuki Okada; Seinosuke Nomura
Original assignee: Daido Keori KK
Current assignee: Daido Keori KK
Priority date: 1966-09-16
Filing date: 1967-09-12
Publication date: 1972-08-29
Anticipated expiration: 1989-08-29
Also published as: DE1685665A1; GB1205264A

Abstract

An apparatus and process for providing twisted yarn with a uniform distribution of twists along the length of the yarn. The process is utilized to set the yarn, after the yarn has been twisted, with a suitable treating or setting medium such as hot water, chemicals etc.

Description

United States Patent Okada et al. 1 Aug. 29, 1972 [54] APPARATUS FOR PRODUCING A NON- 2,089,199 8/1937 Finlayson et a1 ..57I35 IRREGULAR TWIST YARN 2,089,239 8/ 1937 Whitehead ..57/35 721 inventors: Sadayuki Okatla; smite Nomug'ggg'gl'g $1331 ,Y f n both of] wahi J o0 m i 2,838,903 6/1958 Sutter.... ..........57/77.3 X [73] Assignees: GijIlMl my" Kumhi Alllliit 3,064,413 11/1962 Stames.. ...........57/58.59 Kenkyuflo, lnazawa-shi; Daido 3,151,438 10/1964 Althof ..57/51 Kwri Kgbuslflkl Kflgha, Tokyo, 3,377,790 4/1968 Brocke]....................57/58.59 FOREIGN PATENTS OR APPLICATIONS [22] 1967 585,450 10/1959 Canada ..s7/34 [2]] App]. No.: 667,144 1,440,294 4/1966 France ..57/58.59 642,970 3/1937 Germany ..57/34 364,938 1/1932 Great Britain ..57/35 [301 Fm 701,964 111954 Great Britain ..57/51 Sept. 16,1966 Japan......................41I6l297 Sept. 16, 1966 Japan "41/612918 OTHER PUBUCMTONS Sept. 16, 1966 Japan ..4ll61296 OAS 1,112,928, Germany, Althof, publ. 9-1957 [52] US. Cl. ..57I34 HS, 57/35, 57/62 P i ry Mun-Stanley N, Gilreath [51] Int. Cl. mlll 13/30 A i tant Examiner-Werner H, Schroeder [58] Field of Search ..57/34, 35, 51, 58.49, 58.57, Attorney-Robert E, Burns 157 MS, 164 [57] ABSTRACT An apparatus and process for providing twisted yarn [56] References Cited with a uniform distribution of twists along the length UNITED STATES PATENTS of the yarn. The process is utilized to set the yarn, after the yarn has been twisted, with a suitable treating 3,050,819 8/1962 Allman, Jr. 01.81. .......s7/34 x in h h t w h 1 t 1,987,449 1/1935 Schweiur e181 ..57/62 )1 gm mm Suc as W c 5 e c 2,089,198 8/1937 Finlayson e1 a1.........57/157 X 6 Claims, 18 Drawing Figures PATENTED IBTZ 3.686.845

saw u or 4 APPARATUS FOR PRODUCING A NON- IRREGULAR TWIST YARN The method of obtaining twisted yarn by twisting fibrous material, for example, wool or other natural fiber material, or fibrous material such as various kinds of synthetic fibers is known in the art.

The prior art discloses a number of systems having methods for twisting yarn, namely, the ring-twisting system, the captwisting system, the flyer-twisting system, and the up-twisting or double-twisting system, etc. It can be said with respect to these yarn-twisting methods that, during the operation thereof, the twist tends to be concentrated in the thin section of the yarn, thereby increasing twist irregularity, i.e., varying amounts of twists per unit length because the twisting zone or distance between the yarn cop and the winding device is relatively long.

In addition, it has been known to set yarn thatis al ready twisted. But generally, in each of these cases, the wound cop is subjected to a steam set in the usual atmosphere or vacuum chamber with the cop wound as it is. Therefore, a difference in the steam set inevitably occurs between the outer layer and the inner layer of the copy yarn layers, resulting in difliculty of application of a uniform treatment to all of the layers of yarn. As a result, when a satisfactory steam set is applied to the inner layer, the outer layer may be overtreated, resulting not only in the deterioration of the quality of the fiber material, but also in a increase of so-called snarls. In addition, it increases the difficulty of obtaining yarn having twist uniformity, i.e., unvarying amounts of twists per length.

An object of the present invention is to provide uniformly twisted yarn without twist back, yarn irregularity, yam strain and unevenness of snarl due to insufficient set, etc.

Another object of the present invention is to provide improved yarn, especially wool yarn having the characteristics of twist uniformity.

Still another object of the present invention is to provide yarn products having excellent appearance, good touch, good physical properties and other desirable characteristics, and most importantly yarn that is well suited for manufacturing wool fiber products.

A further object of the present invention is to provide a novel method including novel apparatus suitable for manufacturing such yarn products easily, continuously and efficiently.

A still further object of the present invention is to provide improved and economically feasible apparatus for such yarn products.

According to the objects as described above and as will be described hereinafter, the present invention provides that uniformly twisted yarn having none of the above-mentioned irregularities can be obtained efficiently by applying twisting or setting to the yarn along a relatively short length of the yarn.

In order to attain the objects described above, the yarn according to the present invention is provided with a uniform twist distribution in the axial direction by shortening substantially the treatment portion of the fiber material comprising the yarn. Further, according to the present invention, improved textile products such as novel and improved yarns, knitted and woven fabrics, industrially used textile products and the like are produced from fabric material provided by the present invention. Clothing, including stockings, gloves, mufflers, hats, and fancy and delicate material, cushion material, carpet, chair cover material, wall material and other articles of high quality having good appearances and touch can be produced from such woven goods utilizing the yarn provided by the present invention.

In order to provide such products by utilizing the present invention, a false twisting device is provided suitably close to the winding area between the yarn cop and said winding device, which false twisting device is rotated in the same direction as the twist of the yarn. The yarn is passed through the false twisting device, and after passing through the device a real or true twist is applied to the yarn in the short distance between the false twisting and the winding device. Further, the invention provides a continuous treatment for setting the twisted yarn and the means for preventing the transfer of the twist during the continuous treatment.

With the above and additional objects and advantages in view as will hereinafter appear, this invention comprises the devices, combinations, and arrange ments of parts hereinafter described and illustrated in the accompanying drawings of preferred embodiments.

FIGS. la and lb are enlarged views showing the yarn provided by the present invention and the corresponding yarn provided by the prior art apparatus and method, respectively.

FIG. 2 is a schematic perspective view of one embodiment of the present invention.

FIGS. 3 and 4 are schematic drawings in section of two different arrangements of a portion of the present invention.

FIGS. 5 and 6 are enlarged views of a portion of the twisted yarn provided by the present invention with the twisting device operated at two different speeds relatively to the speed of rotation of the yarn cop.

FIG. 7 is a schematic perspective view, partially broken away, showing another embodiment of the present invention.

FIG. 8 is a schematic perspective view of a modified portion of the arrangement shown in FIG. 7.

FIG. 9 is a schematic perspective view, partially broken away of a modification of the treating apparatus shown in FIG. 7.

FIG. 10 is an enlarged schematic view showing a segment of the yarn as it passes between the false twisting devices of the present invention.

FIG. 11 is a schematic perspective view, partially broken away of another embodiment of the present invention.

FIG. 12 is a schematic perspective view partially broken away, of another embodiment of the present invention.

FIG. 13 is a graph of the strength and elongation curves of the yarn obtained by using the device shown in FIG. 11.

FIG. 14 is an enlarged schematic view showing a segment of the yarn during twisting and twist setting operation of the arrangement shown in FIG. 12.

FIG. 15 is a schematic perspective view, partially broken away, showing a modification of a portion of the apparatus shown in FIG. I].

FIG. 16 is a schematic perspective view, partially broken away, showing a modification of a portion of the apparatus shown in FIG. 1 l.

FIG. 17 is a schematic perspective view of a modified portion of the apparatus shown in FIG. 16.

DESCRIPTION OF THE PREFERRED EMBODIMENTS.

In FIG. In there is shown a section of yarn 3 according to the present invention. In FIG. 1b there is shown a corresponding section of yarn as is conventional in the prior art. The length of the section of yarn shown in each of FIGS. la and lb is 20 cm. Each section of the yarn has a thin part between two thick parts and parts of varying intermediate thickness between the thick and thin parts. In practice, there are many variations in the shape of the yarn, but for simplicity only one shape is shown. In this case, the yarn sections in FIGS. la and 1b are gripped by their ends. The yarn sections in FIGS. la and 1b are divided by the dotted line into 20 parts and a total number of I twists [100T (turns)] are applied. Yarn number, fuzz, etc., will not be considered here.

Thus, when 100 revolutions of twist are applied to each of the yarn sections in FIGS. la and lb, the numerical value of the twist for each section as a whole is the same. But in the yarn section in FIG. lb the parts I to 4 each have three twists, 3T, the part 5, 4T, the part 6T, the parts '7 to to 14, 7T, the part 15, GT, the part 16, 4T., and the parts 17 to 20, 3T. Therefore, in the narrow section the twist is concentrated relatively to the thick sections where less twist per length is available: accordingly, twist irregularity and other irregularities are produced and a uniform or regular section of yarn cannot be obtained. In contrast, in the yarn section in FIG. la the number of twists per length remains the same throughout the entire length. Thus, in the section in FIG. Ia five twists (ST) per part are shown for each of the parts 20 irrespective of the variation in the thickness of the yarn: thus, the twist uniformity of the yarn in FIG. la is greatly improved over that of the prior art yarn as shown in FIG. lb.

In ring-twisting systems and other conventional twisting systems, including advanced up-twisting systems and double-twisting systems, the twist irregularity or nonuniforrnity of the yarn to be produced is substantially equivalent to that of the yarn shown in FIG. lb. Further, in the up-twisting system in which the twist is transmitted to the cop for the yarn, even the fuzz of the cop yarn adjacent to the cop tends to be twisted in, so that the separation of the yarn is poor and yarn having a large amount of undesirable fuzz is produced.

According to the present invention, as has been briefly explained above, a false twisting device is arranged between a yarn cop and the winding device for the yarn, preferably close to the winding device and the distance between the yarn cop and the winding device is shortened as much as possible to prevent twist concentration in the thin sections of the yarn. Thus, twisted yarn having a small amount of twist irregularity can be produced, and owing to the false twisting means, the twist of the yarn between the false twisting means and the cop of the yarn can be decreased to nearly zero or as small as possible, whereby the bobbin-unwinding operation is greatly improved and twisted yarn having a small amount of fuzz can be produced.

Among the drawings showing the preferred embodiments of the invention, FIG. 2 discloses a cop 4 about which is wound the yarn 3 that is to be twisted. The cop 4 is mounted on a spindle 5 and is rotated in the direction of an arrow 6, the yarn 3 being led through a yarn guide 8. A winding roller assembly 9 includes driving rollers 94 and 9c rotating in the direction of the arrows 7 and 70, respectively, and supported by the

shafts

9b and 9d, respectively. A yam-winding cone I0 is supported by the shaft 11 and rotated in the direction of the arrow 12 by friction through

rollers

9a and 9c.

In the conventional up-twisting system, the twisted yarn is wound on the cone through a yarn guide, but in the present invention, a false twisting device is arranged in the system. Thus, a false twisting device I3 holds the yarn temporarily between the false twisting device and the other portion, and can apply a false twist to the yarn for a time, which twist may be increased or decreased.

The false twisting device 13 includes a supporting piece 14, that supports a tube 15 for rotation in the direction of the arrow [5a. A ring 16 is provided on the upper part of the tube 15, the yarn being passed through the ring 16. Accordingly, the yarn unwound from the yarn cop is passed through the ring I6 on the upper part of the tube 15 of the false twisting device 13 through the yarn guide 8 and is passed through a winding roller assembly 9. The false twisting device is rotated in the same direction and at the same speed as that of the spindle 5 to apply nearly the same number of twists to the yarn between the cop 4 and the device 13 as that produced by spindle rotation. In addition, the desired number of twists is applied to the yarn in the short distance between the false twisting device and the winding roller; thus, a uniformly twisted yarn having no twist irregularities or fuzz is obtained.

Further, in the case of non-twist filament or parallelspun yarn, especially parallel winding cops, when the non-twist filament or the parallel-spun yarn is likely to become separated and tangled due to the ballooning by the rotation of the spindle, the rotation of the false twisting device may be made somewhat slower than the rotation of the cop spindle, thereby to apply some twist to the yarn between the yarn cop and the false twisting device, and the number of twists that remain may be applied between the false twisting device and the winding roller.

The state of the yarn during the described twisting operations will be explained by referring to the drawings. Initially, as shown in FIG. 5, when the rotation of the false twisting device is in the same direction and at the same speed as the spindle, the twisting device 13 and the cop 4 is decreased, as shown by the segment 30, so that there is no twist, but after passing the false twisting device the desired twist is applied as shown by the segment 30. Further, when the speed of rotation of the false twisting device is decreased to a somewhat slower rotational speed than that of the spindle, as shown in FIG. 6, a small amount of false twist is applied to the yarn section 3b between the spindle and the false twisting device, and after passing the false twisting device a true twist can be applied to the yarn in the short section 3c above the false twisting device.

FIG. 3 shows an embodiment in which a cover 114 surrounds the cop spindle 4. The cover 114 can decrease the air resistance due to the ballooning of the yarn, and decrease the tension of the twist yarn. FIG. 4 shown an embodiment in which a cover IIS is fixed to the spindle 5, thereby to decrease undesirable twist yarn tension. In this embodiment (FIG. 4), the cop spindle and the false twisting device rotate at the same speed, the false twisting means 13 being attached to the cover 115 thereby eliminating the necessity for a means to drive the false twisting device.

Setting the twist yarn properly is an important consideration in the production of non-irregular or uniformly twisted yarn. According to the present invention, the method for setting the twist by a steam treatment, with the cop as it is, is not adopted. This method is known in the prior art. The yarn to be subjected to a twist set is unwound from the cop and wound by the winding roller assembly and during the unwinding operation the yarn is treated, using a suitable treating or setting medium such as hot water, chemical agents, etc., the operation being combined with a false twist provided by the false twisting device. The resulting yarn has no snarls so that a good yarn appearance is obtained.

Utilizing the present invention, the yarn is not as likely to be damaged as is the yarn tested by the usual coptwisting system. In addition, the present invention provides that uniform twist set may be applied under very mild conditions and yet can be accomplished by simple means. According to the present invention, the treating hours can be shortened to about H100 to l/l,000 or more.

The embodiment shown in FIG. 7 differs from the embodiment shown in FIG. 2, as can be understood from the following. A cover 116 has protecting means 17 such as fur in the inner part thereof while 18 is a tension compensator and 25 is a treating apparatus. The tension compensator 18 has two friction plates 19 and 190, a bolt 20 projecting from the plate 190 on one side, a spring 21 wound on the bolt 20 to press the

friction plates

19 and 19a together. Thus, the tension of the yarn can be adjusted. The treating apparatus 24 includes a hollow treating cylinder 27 provided with

yarn passages

28 and 29 and an entrance conduit 25 and an outlet conduit 26 for a treating medium such as dry heat or wet heat or a chemical agent, etc. The yarn 3 to be unwound from a yarn cop 4a is lightly contacted by the fur 17 within the cover 116 and comes out unwrinkled, and thereafter passes through the yarn guide 8 and the tension compensator 18 where suitable tension is applied, and it thereafter advances to the false twisting device 13 through the treating apparatus 24. In the false twisting device 13, the speed of rotation relative to the number of twists applied to the yarn is not limited at all theoretically but in practice up to twice the twist number is sufficient. The yarn is heated in the treating apparatus 24 by the treating medium, for example, steam, and immediately after passing the false twisting device, the part having the increased twist due to the false twist is returned rapidly to the number of twists of the former yarn, namely, the yarn whose twist has not been increased, and is wound on the cone attached to the winding roller assembly 9.

The condition of the yarn in the false twist state described above is shown in FIG. 10, and will be explained by reference thereto. Thus, when the yarn 3 passes the treating apparatus 24 through the tension compensator 18 a twist as shown by 3d is applied'having two or three times as many twists per unit length as that of the sections before and after the appropriate false twisting device 13, the section 3d being subjected to the heat medium in the apparatus 24. Only the increased or false twists are set as the yarn is heated; thus the generation of snarl produced by twist return can be prevented.

FIG. 8 shown another embodiment of the present invention that functions to prevent the snarl mentioned above. In this embodiment, a drawing roller assembly 30 is provided with a pair of rotatable parallel

contiguous rollers

30a and 30b which are mounted between the tension compensator l8 and the treating apparatus 24, the other elements being the same as in FIG. 7. The yarn is passed between the

rollers

30a and 30b, and a speed difference can be provided between the cooperating

drawing rollers

30a and 30b and said cooperating driving rollers %r and 9c whereby the tension of the yarn during the heat treatment can be adjusted within a wider range than that provided by the embodiment shown in FIG. 7. Thus, a yarn of better appearance and improved properties can be obtained. In addition, in order to prevent a snarl from developing prior to setting the twist in the yarn as it is unwound from the yarn cop, a protecting means such as the fur is provided as in FIG. 7. Further, to decrease the yarn twist temporarily, for example, the false twisting device may replace the yarn guide 8.

FIG. 9 shows another embodiment of the present invention disclosing another arrangement for applying a heat treatment to the yarn, wherein a pair of

parallel drawing rollers

31 and 31a are arranged in a treating box 27a of the treating apparatus 24a, the apparatus 240 being arranged to keep the yarn in the heating zone for a longer time. Thus, the treating effect on the yarn can be increased. In one experiment, a result of 0-l/S0m of the number of snarls was obtained, which is a substantial improvement over prior known methods.

In the present invention, the yarn to be treated includes hydrophilic fibers such as worsted yarn or hydrophobic fibers such as nylon yarn, and to these fibers are applied methods disclosed herein to effect the prevention of twist irregularity, the prevention of snarl and other undesirable occurrences. There is no limit to the kinds of forms or the yarns and fibers to which the methods of the present invention can be applied.

In this case, for example, the twisting system utilizing the rotary spindle of the cop to be twisted, such as used in the up-twisting system or double-twisting system, is used for twisting and the twisted yarn is subjected to a heat treatment in a twist set treatment zone between the drawing roller and the winding roller, whereby twist set treatment is carried on continuously. Thus, the operation of twisting and setting can be carried on under very mold conditions.

FIG. 11 discloses a continuous twist and twist-setting means according to the present invention. Thus, a cop spindle 5 rotates constantly, and untwisted yarn composed of wool or a mixed material comprising wool and synthetic fiber is unwound therefrom, twisted, and passed through the yarn guide 8, tension compensator l8, drawing

rollers

30a and 30b and is subjected to a heat treatment by the treating apparatus 24. According to the system shown in FIG. 4, twist yarn of wool or wool-blended yarn is given a twist set with safety and uniformity.

The following table I was prepared utilizing yarn having a common twist of 2/3Ss wool 100 percent, a spindle rotating at 7,000 r.p.m. to compare the length of the heating zone, and the speed ratio of the rollers for the winding roller assembly to the rollers for the drawing roller assembly with the number of snarls:

Further, when the yarn is wound upon the seriplane, good yarn appearance can be obtained at a smaller value of the speed ratio of the rollers for the winding roller assembly to the rollers for the drawing roller assembly. Thus, the apparatus for driving the rollers for the respective assemblies may be adjusted to vary the speed ratio therebetween. FIG. 13 discloses a graph of the yarn as described above. In the drawing, it is shown that the yarn treated at the small value of the speed ratio of the rollers for the winding roller assembly to the rollers for the drawing roller assembly has good extension qualities.

FIG. 12 is a modification of the system shown in FIG. 11. The only difference between FIG. 11 and FIG. 12 is the addition of the false twisting devices 13 and 130 which provide for more uniform twist operation and a surer twist set operation that can be carried on more efficiently. Namely, by placing the false twisting device 13 as close as possible to the drawing roller assembly 30, the twist is applied in the short distance between the drawing roller assembly 30 and the false twisting device 13, and the twist irregularity caused by the yarn irregularity is reduced substantially. By placing another false twisting device 130 between the heat-treating apparatus 24 and the winding roller assembly 9, the effect of the twist set by the heat treatment is increased and the heat treatment zone can be shortened and made more compact. Further, by shortening the distance between the drawing roller assembly 30 and the false twisting device 130, it has been found that an effective twist can be obtained without decreasing the uniformity of the yarn and without increasing twist irregularity at the twisting zone.

The condition of the yarn provided by the system shown in FIG. 12 is shown in FIG. 14. In FIG. 14: the section 3c of the yarn 3 indicates a small amount of false twist the section 3f discloses a real or true twist, the section 3 discloses an increased false twist in the heating zone, and the section 311 discloses the same number of twists per length as the section 3f. Thus, section 3f shows yarn having a true or real twist, i.e., the completed twist yarn, in which the twist set is finished by the increased false twist 3g.

Regardless of the means utilized, by setting the yarn in a short distance by shortening the length of the yarn at the twisting zone during twist operation, a uniform twist, as shown in FIG. la, is obtained. The movement of the twist along the axial length of the yarn is restrained for stabilizing the uniformly applied twist until the twist set is completed.

FIG. 15 is a further modification which may be combined with the structure shown in each of the embodiments described above. In FIG. 15, 32 shows means for applying a setting medium to the twisted yarn. The means 32 is mounted on

rotary shafts

33, 33a, 34 and 340. An endless belt 35 is mounted on the

shafts

33 and 34 and an endless belt 350 is mounted on the

shafts

33a and 34a. The

endless belts

35, 35a are made of wire net and have adjacent faces that move in the same direction and between which is sandwiched the yarn 3. The

shafts

33, 33a, 34 and 340 are driven by means not shown in FIG. 15. There are also provided noules 36 and 360 which direct streams of the treating medium at the belt 350. The uniformly twisted yarn obtained by the above-described method passes between the

endless belts

35 and 35a of the means 32 from the drawing roller assembly 30. During this process movement of the twists along the length of the yarn is prevented by the uneveness of the wire net.

To set the twist, the treating means 32 may utilize heating, cooling, water, steam, dehydration, drying and other suitable media and methods. Any type of device may be used if the twist yarn can be held by restraining it to such a degree that the twist will not move during the twist set treatment, for example, the devices shown in FIGS. 16 and 17. In FIG. 16, a wire net 38 is mounted on the periphery of the cylinder 37 rotated by the shaft 37a. As the yarn advances, movement of its twist is restrained by the uneveness of the wire net. In FIG. 17, in place of the wire nets a V-shaped groove 39 (in cross-section) is provided in the cylinder 37 which again is driven by the shaft 370. The twist yarn is inserted into the groove 39 to prevent movement of the twists along the length of the yarn.

In addition to the treating medium described above, other media such as oil agents, paste, etc., may be used. Although it is not limited thereto, the following is preferable: for synthetic fibers a dry heating-cooling treatment, for natural fibers a dry heating-cold treatment and wet heating-dry treatment. After all the twist set treating means for preventing the movement of these twists is the twist set means itself, and other means too may be used if it performs the same fu nctions. Accordingly, the device shown in FIG. 2 can restrain the movement of the twist. Namely, in FIG. 2, the twist yarn coming out of the winding roller 9 is wound on the cone 10 immediately thereafter so that the movement of the twist is restrained.

From the above description, it can be understood that the twist yarn produced according to the present invention has a very uniform quality. According to the present invention another excellent characteristic has been found, namely, that integrated work can be realized, and when a treating medium is used, each treatment of sizing, oiling, or waxing, etc. can be used combined optionally, and further simplification of the apparatus and working may be possible. The invention may be realized as follows:

EXAMPLE 1 Using two parallel yarns of I percent worsted yarn l/48s (first twist Z 60t/l0cm), a cross winding yarn cop is made. Such a cop is used and carried by a cop spindle such as the one shown in FIG. 4. Comparing the twist yarn obtained according to the process of the invention with the twist yarn obtained by the up-twisted and ring-twisting systems of Irregularity prior art, the

result shown in table Note: No. of final twist is S56ll0cm.

Twist irregularity is the standard deviation of cm of test length.

EXAMPLE 2 Under the same conditions as in the above-described example I, the clearance between the false twisting device and the winding roller assembly decreased as much as possible, which in practice is about 10mm due to the characteristics of the device. The result obtained thereby shows that the amount of fuzz is very small, and the twist irregularity is 2.8 percent. Accordingly, it can be understood that by bringing the false twisting device close to the winding means a much better result is obtained.

The following examples relate to the prevention of snarl.

EXAMPLE 3 100 percent worsted yarn l/48s (secured twist S56tll0cm, first twist Z60t/l0cm) is utilized with the device shown in FIG. 8 under the following conditions:

Yarn speed: No. ofincreased twist due to the false twist applied:

about m/min.

Sl.7tll0cm (No. oftwist of yarn x 0.03

Heat treating part: Length lOem (Treating time about 5: sec.)

Winding roller assembly:

Drawing roller assembly: 0.98/L00 The degree of the twist set of the yarn treated by the method described above is: no. of snarls; average 2/50cm, maximum 3/50cm, minimum l/50cm. There was no irregular distribution of the snarl. In contrast, in the case of the conventional twist set in the vacuum chamber; no. of snarls; average 8/50cm, greatest l3/50cm, least l/50cm. Both the number of snarls and the irregularity of the yarn was high.

EXAMPLE 4 In this example, the conditions are the same as those in example 3 except:

Increased No. of twists due to false twist:

ll.2t/l0cm (No. of twist of the yarn X02) and as an extreme condition it was carried on without any heat treatment. The degree of the twist set thereof has a value of: no. of snarls; average 3/50cm.

EXAMPLE 5 In this example, nylon filament d is used and a twist of 800t/m is put on the device shown in FIG. 9 under the following conditions:

No. of increased twists due 400 t/m (No. of twists of to the false twist: yam X 0.5)

Yarn Speed: About Zorn/min Heat treatment part: length 30cm Heat treatment time: About one second 200C dry Heat treatment Winding roller assembly] Drawing roller assembly: 1.0/1.0

The degree of the twist set of the yarn obtained no. of snarls under 1.50cm.

The following samples relate to twist irregularity and the snarl.

EXAMPLE 6 Using two parallel cops of I00 percent worsted yarn l/48s (first twist Z60t/l0cm), by the up-twisting system, second twist Mp/S 56t/ 10cm, speed ratio of winding roller assembly/drawing roller assembly being 0.97. The device shown in FIG. 12 is used and the result shown in table no. 3 is as follows:

TABLE 3 The present The Prior Invention Art Yarn Speed 20 mlmin. Length of Steam Set l0 cm I00C) Number of Increased Twists due to False Twist Application l/7T/ l 0 cm Draft 0.97 Number of Snarls Average 2 5 Maximum 3 9 Minimum 1 l Twist Irregularity 5.0 [0.0

As is clear from the table, compared with the results obtained in the prior art using a conventional ringtwisting system and yam-steaming kettle, the present invention provides a greatly improved product.

EXAMPLE 7 Applying the present invention under the same conditions as those set forth in example 6, but using worsted yarn 2/48s (polyester 55 percent, wool 45 percent), the following results were obtained:

TABLE 4 The Present The Prior Invention Art Yarn Speed 20 m/min.

Length of Steam Set 20 cm lOG'C) Number of Increased Twists due to False Twist Application Drafi 1.00

Number of Snarls Average 3 10 Maximum 18 Minimum 2 4 Twist irregularity 5.2 l 1.0

EXAMPLE 8 Using the up-twisting system in: (A) the prior art process, B) the process of the present invention utilizing the apparatus in FIG. 2, (C) the process of the invention utilizing the apparatus in FIG. 15, and in each case using 2/52s worsted mouline yarn, yarn of second twist S59s/l0cm made the following result was obtained:

TABLE 5 The The The Prior Present Present Art invention invention FIG. 2 FIG. 15

Length of Twisting Portion 30 cm 2 cm 2 cm Distance Between the Drawing Roller Assembly and the 4 cm Twist Setting Device Twist irregularity l0.0 L7 3.0

Note: Twist irregularity is the standard deviation of the number of twists per 10cm of length. According to the process of the present invention, woven fabric made with the twist yarn was found to have an excellent appearance and the least amount of irregularity as compared with fabric made from the twist y rn obtained by the conventional processes of the prior art.

The foregoing detailed description is given for clearness of understanding only and no unnecessary limitations are to be understood therefrom, as some modifications will be obvious to those skilled in the art.

What we claim and desire to secure by Letters Patent 1. An apparatus for twisting and setting yarn, said apparatus comprising means for rotating a cop of the yarn to be twisted, means for pulling said yarn from the cop while continuously engaging said yarn, first false twisting means rotating in the same direction as the rotation of the cop of yarn and positioned between said cop of yarn and said pulling means, said first false twisting means being disposed relatively close to said pulling means to apply a true twist to the yarn in the short area between said pulling means and said first twisting means, thereby applying a uniform axial twist distribution to the yarn, yarn winding means, second false twisting means positioned between said pulling means and said yarn winding means, said second false twisting means being rotated in such a way that the number of twists of said yarn between the pulling means and the second false twisting means will be increased over the number of twists in the yarn between the first false twisting means and the pulling means, and means for applying a setting medium to the yarn in the increased twisted state between said second false twisting means 1 2 and said pulling means.

2. An apparatus as set forth in claim 1 wherein said yarn winding means includes a rotatable roller and said means for pulling said yarn includes a rotatable roller and including means for varying the ratio of the speed of rotation between said rollers.

3. A system for twisting and setting yarn comprising a cop of yarn, means for winding the yarn drawn from said cop, first means for twisting the yarn drawn from said cop between said cop and said winding means, second means for twisting the yarn drawn from the cop between said first twisting means and said winding means, means for pulling and continuously engaging the yarn between said first twisting means and second twisting means and means for applying a setting medium between said pulling and engaging means and said second twisting means.

4. An apparatus for twisting and setting yarn, said apparatus comprising means for rotating a cop of the yarn to be twisted, means for pulling said yam from the cop of yarn while continuously engaging said yarn, false twisting means rotating in the same direction as the rotation of said yarn cop and positioned between said yarn cop and said pulling means, said false twisting means being positioned relatively close to said pulling means, said false twisting means applying a true twist to the yarn in the short distance between the pulling means and the false twisting means thereby to apply a uniform axial twist distribution to said yarn, means for applying mechanical friction to the twisted yarn to prevent movement of the twists of the yarn along the length of the yarn to which the mechanical friction is applied, means for applying a setting medium to the length of the yarn to which the mechanical friction is applied and means for winding said set yarn, said means for applying mechanical friction comprising a pair of endless belts constructed with wire net, each of said endless belts having an opposing face adjacent each other and means for driving said belts, the yarn being sandwiched between the adjacent opposing faces of the belts.

5. An apparatus for twisting and setting yarn, said apparatus comprising means for rotating a cop of the yarn to be twisted, means for pulling said yarn from the cop of yarn while continuously engaging said yarn, false twisting means rotating in the same direction as the rotation of said yarn cop and positioned between said yarn cop and said pulling means, said false twisting means being positioned relatively close to said pulling means, said false twisting means applying a true twist to the yarn in the short distance between the pulling means and the false twisting means thereby to apply a uniform axial twist distribution to said yarn, means for applying mechanical friction to the twisted yarn to prevent movement of the twists of the yarn along the length of the yarn to which the mechanical friction is applied, means for applying a setting medium to the length of the yarn to which the mechanical friction is applied and means for winding said set yarn, said means for applying mechanical friction comprising a rotatable cylinder, means for rotating said cylinder, and a wire netting having an uneven surface and mounted on the cylinder, whereby the yarn is advanced in contact with the uneven surface of the wire netting.

6. An apparatus for twisting and setting yarn, said apparatus comprising means for rotating a cop of the yarn to be twisted, means for pulling said yarn from the cop of yarn while continuously engaging said yarn, false twisting means rotating in the same direction as the rotation of said yarn cop and positioned between said yarn cop and said pulling means, said false twisting means being positioned relatively close to said pulling means, said false twisting means applying a true twist to the yarn in the short distance between the pulling means and the false twisting means thereby to apply a uniform axial twist distribution to said yarn, means for applying mechanical friction to the twisted yarn to i t i i I

Claims

2. An apparatus as set forth in claim 1 wherein said yarn winding means includes a rotatable roller and said means for pulling said yarn includes a rotatable roller and including means for varying the ratio of the speed of rotation between said rollers.
3. A system for twisting and setting yarn comprising a cop of yarn, means for winding the yarn drawn from said cop, first means for twisting the yarn drawn from said cop between said cop and said winding means, second means for twisting the yarn drawn from the cop between said first twisting means and said winding means, means for pulling and continuously engaging the yarn between said first twisting means and second twisting means and means for applying a setting medium between said pulling and engaging means and said second twisting means.
4. An apparatus for twisting and setting yarn, said apparatus comprising means for rotating a cop of the yarn to be twisted, means for pulling said yarn from the cop of yarn while continuously engaging said yarn, false twisting means rotating in the same direction as the rotation of said yarn cop and positioned between said yarn cop and said pulling means, said false twisting means being positioned relatively close to said pulling means, said false twisting means applying a true twist to the yarn in the short distance between the pulling means and the false twisting means thereby to apply a uniform axial twist distribution to said yarn, means for applying mechanical friction to the twisted yarn to prevent movement of the twists of the yarn along the length of the yarn to which the mechanical friction is applied, means for applying a setting medium to the length of the yarn to which the mechanical friction is applied and means for winding said set yarn, said means for applying mechanical friction comprising a pair of endless belts constructed with wire net, each of said endless belts having an opposing face adjacent each other and means for driving said belts, the yarn being sandwiched between the adjacent opposing faces of the belts.
5. An apparatus for twisting and setting yarn, said apparatus comprising means for rotating a cop of the yarn to be twisted, means for pulling said yarn from the cop of yarn while continuously engaging said yarn, false twisting means rotating in the same direction as the rotation of said yarn cop and positioned between said yarn cop and said pulling means, said false twisting means being positioned relatively close to said pulling means, said false twisting means applying a true twist to the yarn in the short distance between the pulling meaNs and the false twisting means thereby to apply a uniform axial twist distribution to said yarn, means for applying mechanical friction to the twisted yarn to prevent movement of the twists of the yarn along the length of the yarn to which the mechanical friction is applied, means for applying a setting medium to the length of the yarn to which the mechanical friction is applied and means for winding said set yarn, said means for applying mechanical friction comprising a rotatable cylinder, means for rotating said cylinder, and a wire netting having an uneven surface and mounted on the cylinder, whereby the yarn is advanced in contact with the uneven surface of the wire netting.
6. An apparatus for twisting and setting yarn, said apparatus comprising means for rotating a cop of the yarn to be twisted, means for pulling said yarn from the cop of yarn while continuously engaging said yarn, false twisting means rotating in the same direction as the rotation of said yarn cop and positioned between said yarn cop and said pulling means, said false twisting means being positioned relatively close to said pulling means, said false twisting means applying a true twist to the yarn in the short distance between the pulling means and the false twisting means thereby to apply a uniform axial twist distribution to said yarn, means for applying mechanical friction to the twisted yarn to prevent movement of the twists of the yarn along the length of the yarn to which the mechanical friction is applied, means for applying a setting medium to the length of the yarn to which the mechanical friction is applied and means for winding said set yarn, said means for applying mechanical friction comprising a rotatable cylinder and means for rotating said cylinder, said cylinder provided with a groove and said yarn being received by the groove as it is pulled by said winding means.