US3732677A

US3732677A - Yarn dual twister and doubler

Info

Publication number: US3732677A
Application number: US00032875A
Authority: US
Inventors: W Seem; N Stoddard; R Stoddard
Original assignee: Individual
Current assignee: Individual
Priority date: 1970-04-29
Filing date: 1970-04-29
Publication date: 1973-05-15
Anticipated expiration: 1990-05-15

Abstract

Disclosed is a textile yarn twisting apparatus consisting of a rotating hollow tube with a twist trapping device at one end thereof and means to periodically reverse the direction of rotation of said tube. The twisting apparatus may be positioned on the traverse mechanism of a yarn winding machine in close proximity to yarn take-up means, and serves to insert a measurable twist in the yarn. Disclosed is a method and apparatus for the insertion of a twist of alternately opposing directions in selected successive sections of textile yarn, while being advanced in a continuous process with or without the application of heat while under controlled tension. Also disclosed is a method and apparatus for producing a finished take-up package of yarn suitable for further handling or processing. This abstract of the invention is furnished solely for the purpose of satisfying Rule 72(a).

Description

United States Patent [191 Seem et al.

[541 YARN DUAL TWISTER AND DOUBLER [76] Inventors: Warren A. Seem, 2000 South Ocean Lane, North Wales, Pa. 33316; Nicholas J. Stoddard, 307 Country Road, Berwyn, Pa. 19312; Robert W. Stoddard, 1316 West Chester Pike, Apt. 12-H, West Chester, Pa. 19380 [22] Filed: Apr. 29, 1970 [21] Appl. No.: 32,875

[ 1 May 15, 1973 Corrall et al ..57/77.3 X Mattingly et a1 ..57/77.45 X

[57] ABSTRACT Disclosed is a textile yarn twisting apparatus consisting of a rotating hollow tube with a twist trapping device at one end thereof and means to periodically reverse the direction of rotation of said tube. The twisting apparatus may be positioned on the traverse mechanism of a yarn winding machine in close proximity to yarn take-up means, and serves to insert a measurable twist in the yarn. Disclosed is a method and apparatus for the insertion of a twist of alternately opposing directions in selected successive sections of textile yarn, while being advanced in a continuous process with or without the application of heat while under controlled tension. Also disclosed is a method and apparatus for producing a finished take-up package of yarn suitable for further handling or processing.

This abstract of the invention is furnished solely for the purpose of satisfying Rule 72(a).

9 Claims, 5 Drawing Figures 1 YARN DUAL TWISTER AND DOUBLER The invention of this application may be employed for several separate functions in the textile arts.

First, this invention may be employed in the production of novel and attractive false-twist textured yarn by using it to impart a continuously reversing false-twist to a strand of yarn, wrapping said twisted yarn on a takeup package and subsequently subjecting the package of yarn to heat and moisture, as in an autoclave.

Second, this invention may be used to combine a plurality of individual filaments or individual strands of yarn into a lightly twisted strand of yarn to thereby facilitate handling during further processing of the yarn.

It is well known that when a plurality of strands of textile yarn are gathered together and wound on a takeup package, the filaments will tend to separate during processing unless then are plied together. Also, the unplied filaments of one circumferential pass around the take-up package will tend to become entangled with other such passes already in place, and create a package that is very difficult to unwind or process further.

In the past this problem has been solved by a special operation wherein a binders or producers twist is inserted in the yarn as it is wound on a take-up package. This binders twist has been a true twist that is, one end of the yarn strand is twisted or rotated relative to the other end. A true twist is to be distinguished from a false-twist as the latter is one in which the two ends of a yarn strand are fixed relative to each other and the yarn is twisted about its axis at a point between the two ends of the strand. For certain purposes, false-twisting a yarn is considerably more desireable but falsetwisting has not been used in the past to insert a binders twist in yarn being wound upon a take-up package because of the fact that when a yarn strand is moved linearly through a false-twist spindle at the same time that the spindle rotates, twist is inserted only in the upstream side and when steady state conditions are achieved, simultaneously taken out of the downstream side. As such, once steady state conditions are achieved, the false-twist will not remain in the yarn downstream and the yarn cannot be wound on the take-up package with a twist imparted thereto. Further discussion of this phenomenon may be found in the text entitled Woven Stretch and Textured Fabrics by Berkeley L. Hathorne, copyright 1964 by John Wiley & Sons, New York, N.Y., at page 36.

The textile machine presently used in the throwing industry to ply a plurality of yarn strands is known as a doubler-twister or downtwister. lts purpose is to impart a unidirectional real twist to single strands or to combine multiple strands of textile yarn and insert a twist therein. This machine is complicated and is expensive in its unit cost per spindle station. It requires a large area of floor space and extra ceiling height. As the creels are on top of the machine the operator often requires a step ladder to install the supply packages on the creels and to thread up the tension devices associated with each supply package. The electrical power consumption is high because the take-up packages must be revolved at high speed to accomplish the twisting and winding.

The nature of the traverse mechanism on these machines does not permit the winding ofa precision package because the traveler ring and traveler employed thereon are too far from the takeup package to guide the yarn precisely. The strand material being processed is passed through a traveler ring and traveler which circumscribe the revolving take-up package thereby creating a large balloon. The take-up package, the large balloon of the yarn and massive traverse mechanism of the downtwister limit its productive output.

SUMMARY OF THE INVENTION We have discovered that by rapidly reversing the direction of rotation of a false-twist spindle as yarn is passing through the spindle, a false-twist can be passed through the spindle to the downstream yarn, and if a take-up package is placed in close proximity to the false-twist spindle, the yarn can be wound on the takeup package with a measurable twist of constantly reversing direction imparted thereto. As previously ex-' plained, this twist is a false-twist, as neither end of the yarn strand is rotated relative to the other end, but if measured over a small increment of yarn wound on the take-up package, the twist appears as a true twist as one end of the incremental piece of yarn is rotated relative to the other incremental end. Consequently, by employing our novel reversible false-twist spindle we are able to double yarn that is, gather strands from a plurality of supply packages twist it with frequent reversals of twist direction and wind the twisted yarn on a take-up package, all in one continuous operation.

The number of twists per inch in the twisted strand may be controlled so that in the case of a high number of twists per inch the finished take-up package may be subjected to additional processing, such as the addition of heat to set the reversing twist in the yarn, thereby producing a stretch yarn of varying characteristics. Alternately, in the case ofa low number of twists per inch, the twist imparted to the yarn may simply serve as a binders twist.

It is to be understood that a plurality of supply packages is not essential in our invention and that a yarn filament or filaments may be taken from a single supply package, reversibly twisted and wound on a package which may, if desired, then be subjected to further processing such as the application of heat to set the twist.

The term yarn will be understood to embrace all textile strand-like material including continuous filament and staple fibers, natural and man made.

An object of the invention is to provide a rapid economical means to combine textile strand material from a plurality of supply packages.

Another object of the invention is to provide a means to wind a take-up package with a plurality of yarn filaments combined into a single strand while preventing separation of said yarn filaments during the winding.

A further object of the invention is to provide means to enable a yarn or a plurality of yarns to be wound on a take-up package with a twist imparted thereto of alternately reversing direction.

Another object of the invention is to provide a tinished take-up package of yarn wound with yarn having a twist imparted thereto of alternately reversing direction, suitable for further handling or processing.

Still another object of the invention is to provide a means which may be employed as an integral part of existing textile machinery on which strand material is processed or converted into finished fabric.

Still other objects will become apparent when the present specification and drawings are fully considered.

This invention relates to a textile spindle and associated apparatus for the purpose of combining and imparting measurable twist in a continuously traveling textile yarn or multiples thereof by means of a falsetwist spindle which is periodically reversed from clockwise to counterclockwise rotation during the processing. When the term true twist is used, it is to be understood that only a small increment of the textile yarn is being considered and that as measured from one end of the incremental piece of yarn to the other end, true twist appears to exist. As has been previously explained, the entire yarn measured from beginning to end will consist of false-twisted yarn, as neither end is rotated relative to the other.

The textile spindle comprises a hollow tube with twist trapping means at one extremity thereof. The hollow tube may be an integral part of an electric motor shaft upon which the rotor or armature is secured and is designed for reversible rotation in suitable bearings. The electric motor should be designed to have the capability of delivering high torque, a very tiny rotor for minimum inertia and three phase windings for rapid reversal of magnetic field. Instead of a portion of a motor shaft, the hollow tube may also be mounted in suitable bearings and rotated by external driving means.

It is of the utmost importance to position the twist trapping extremity of the spindle in a closely spaced relationship to the yarn take-up or other yarn advancing means, to prevent loss of twist imparted by the rapidly rotating and reversing spindle. The distance between the twist trapping means and the yarn take-up or advancing means is referred to as the Twist Propagating Zone. The inserted real twist is controlled directly by the length of the Twist Propagating Zone, the speed of the rotating spindle, the rate of periodic reversal of spindle rotation and the linear speed of travel of the yarn in process. If the Twist Propagating Zone is too long, the inserted real twist will be of very low magnitude and defeat the purpose of the invention.

The rotating and reversing spindle may be mounted directly upon a textile machine member such as a standard traverse guide mechanism on an existing textile machine. The reciprocating motion of the traverse guide mechanism serves to guide the yarn back and forth to produce a symmetrical yarn package. In this application, the spindle would replace a standard traverse yarn guide.

The rotating spindle may also be mounted in a fixed position on a textile machine member to insert twist of opposing spirals and to function as a yarn feed in some other process, such as a knitting process. Controlled heat may also be applied to temperature sensitive textile yarn to continuously thermally process a yarn strand through the invention. Regulatable tension means such as positively driven rolls or gate tensions may be used to selectively control the yarn tension and to maintain it at a prescribed constant level during the continuous processing. The textile yarns to be processed may be supplied by a single package of monofilament or multifilament yarns. A multiplicity of supply packages may also be combined to form a continuous strand of yarn composed of different types and deniers of fiber. This latter instance of a multiplicity of supply packages is of great importance as it enables an operator to combine a doubling operation with that of taking-up or winding yarn that has been formed into a single strand.

The invention lends itself admirably to single deck or multiple deck machine construction with minimal space requirement and electrical power consumption.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front elevation schematic view of the apparatus of FIGS. 3 and 4 and related elements, all forming a part of the disclosed invention.

FIG. 2 is a side view of the schematic view of FIG. 1.

FIG. 3 is a transverse cross section of a preferred embodiment of a portion of the disclosed invention through off-set section plane line 33 of FIG. 4.

FIG. 4 is a front elevation view of FIG. 3 taken through section plane line 44 of FIG. 3.

FIG. 5 is a schematic block diagram depicting the essential elements to control the supply of electrical energy to the invention and the necessary elements to synchronize the operation of the invention.

DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION A preferred embodiment of the invention will now be described with reference to the drawings. The apparatus of the instant invention will be described in the environment of a single station of a textile machine that has supply packages of yarn, tensioning devices, guides, a take-up mechanism consisting of cork roll and a takeup package, and a traverse rod having a lateral displacement equivalent to the length of the finished takeup package.

With specific reference to FIGS. 1 and 2, a schematic representation of one station of such a textile machine is shown. Cree] assembly 10 is adapted to have yarn supply packages 11 mounted thereon, each in alignment with gate tensions 12. Individual strands of yarn Y are drawn from each supply package, passed through the appropriate tensioning device 12, and through the appropriate faller eye 13. Faller eyes 13 are pivotally mounted mechanisms that will interrupt the operation of the individual station in the event that a strand of yarn should break or a supply package 11 should be depleted.

The individual strands of yarn Y are gathered through centering eye 61, passed through the hollow shaft 34 of motor 30, wrapped one or more times around twist trapping member or pin 32 and passed through yarn guide 33.

Motor 30 is mounted on motor plate 50 which in turn is mounted on pivot block plate 60. Pivot block plate is attached to traverse rod 20 so that the motor assembly will reciprocate with traverse rod 20. In this manner, the yarn passing through guide 33 will be reciprocated along take-up package 41 to produce a symmetrically shaped package of yarn. Take-up package 41 is rotated by its peripheral contact with cork roll 40 which in turn rotates at a speed determined by the rotary speed of drive roll shaft 42.

With particular reference to FIG. 2 it is seen that twist trapping pin 32 is positioned at a distance P from the point of contact between take-up package 41 and cork roll 40. Distance P is referred to as the Twist Propagating Zone.

Attached to drive roll shaft 42 is gear 43 which in turn meshes with gear 44. Attached to gear 44, and rotating therewith, is power sequence control drum 45.

This power sequence control drum has on its surface a set of interrupted electrical contacts and, as power sequence control drum rotates, the electrical energy supplied to motor 30 will be switched in a manner to cause rapid reversal of the direction of rotation of motor shaft 34.

The rotary speed of drive roll shaft 42 is coordinated in a known manner with the reciprocal speed of traverse rod and, by choosing appropriate gear ratios with

gears

43 and 44, the rotary speed of power sequence control drum 45 is also synchronized therewith. In this manner, perfect placement on the take-up package of the twists in one direction, null points between alternate directions of twist, and twist in the other direction is assured.

The electrical energy necessary for the operation of the instant invention is schematically illustrated in FIG. 5. Electrical energy is supplied from source 110 and is conducted to motor-generator set 130 through switch 11 1. By means of controller 120 the speed, output voltage and output frequency of motor-generator set 130 may be controlled. Preferably, the output voltage should not exceed 24 volts for personal safety. Electrical leads 46 issue from motor-generator set 130 with two leads contacting the peripheral surface of power sequence control drum 45 and one lead by-passing the power sequence control drum 45.

As described above, the rotation of drive roll shaft 42 drives gear 43 which in turn drives gear 44 and power sequence control drum 45. As the power sequence control drum rotates the electrical energy is reversibly switched between two of the three contacts '47. Twisting motor 30 is connected to the three phase power lines 46 through sliding contacts 47 and the shaft of motor 30 will rapidly reverse its direction of rotation in a manner that is synchronized with the rotation of power sequence control drum 45.

It is to be understood that motor-generator set 130 should have the capacity to operate at least one textile yarn processing machine having at least 200 operating stations, each with a twister motor 30.

The twister motor assembly is shown in greater detail in FIGS. 3 and 4 and consists of two main parts. The first is means to reversibly false twist the strand of yarn passing through the apparatus and the second is means for attaching the assembly to the reciprocating traverse rod.

Twister motor 30 is shown in cross section in FIG. 4 and consists of a hollow shaft 34 mounted for rotations in

bearings

36 and 37. Motor shaft 34 functions as a false twist spindle blade and has twist trapper body 31 mounted on one end thereof. Twist trapping member or pin 32 is transversally mounted in twist trapper body 31 and is in alignment with yarn guide 33. Motor rotor 33 surrounds and is attached to motor shaft 34 and is itself surrounded by a three phase field winding and lamenated stator 39.

Motor 30 is mounted on motor plate 50 by rubber bushings 51. Motor plate 50 is pivotally mounted at 52 on pivot block plate 60. Pivot 52 permits motor plate 50 to oscillate as the attached follower assembly 70 is guided by taper bar 71. The function of taper bar 71 is to control the follower assembly 70 and attached motor plate 50 in a manner that, as the diameter of take-up package 41 constantly increases as it is being wound, the edge configuration of the package will be tapered as is visible in FIG. 1. This function of control is old in the art and consequently is not shown in great detail.

As described above, motor plate 50 is attached to pivot block plate 60 which in turn is mounted on pivot block 90. Pivot block plate 60 serves as a support for both the electrical connection devices associated with the instant invention and the pivot assembly that locks the twister motor onto the traverse rod 20.

As the entire motor assembly will reciprocate with the traverse rod when the two are locked together, it is necessary to provide a sliding electrical contact running the full extent of the textile machine. Insulated power conductor assembly 47 is rigidly mounted to the main textile machine and has on its surface three elongated sliding contacts 48. Insulated assembly 81 is attached to one side of pivot block plate 60 and has placed thereon three brushes that are spaced in a manner to each contact one of the three sliding electrical contacts 48. In this manner, as the assembly reciprocates with the traverse rod, the electrical connection between the motor and the power sequence control drum 45 will be maintained.

Pivot block and its associated parts are releaseably connected to traverse rod 20 by means of a tapered dog 96 which engages a tapered hole 21 drilled into traverse rod 20.

Once the main textile machine is put into operation, traverse rod 20 continually reciprocates. Thus, when it is necessary to thread up the twisting motor at a given station on the main textile machine, it is necessary to disconnect the assembly from both the electrical energy source and the moving traverse rod 20. With particular reference to FIG. 4 pivot block 90 has pivot block hole 91 passing therethrough and a pivot bearing 92 within hole 91 and rigidly attached to block 90. Lock-out tube 94 is positioned within pivot bearing 92 and the outer and inner diameters of these two elements are of a size to permit relative motion between each other. Lock-out tube 94 extends the full length of the textile machine and traverse rod and is rigidly mounted at its extremeties to the main textile machine. Lock-out tube 94 has a lock-out tube slot 101 that is cut the full extent of lock-out tube 94. Lock-out tube slot 101 is necessary to allow tapered dog 96 to pass along the length of lock-out tube 94 as the traverse rod 20 reciprocates back and forth along the extent of takeup package 41.

The twister assembly may be disconnected from traverse rod 20 by pulling down on release knob 100 and, as seen in FIG. 3, pushing same to the right. Tapered dog 96, which is normally biased by spring 98 in a direction toward tapered hole 21, is withdrawn from tapered hole 21 and rotated along with pivot block 90 and pivot block bearing 92 until the end of tapered dog is aligned with locking groove 102. Locking groove 102 is cut into lock-out tube 94 and must extend the full length of lock-out tube 94 as the position of the assembly at any given time varies throughout the extent of the reciprocal motion of the traverse rod.

When tapered dog 96 is in alignment with locking groove 102, release knob 100 is released and spring 98 biases the end of tapered dog 96 into groove 102. Tapered dog 96 is mounted to pivot block 90 by means of a threaded bushing and spring 98 is supported by a split-ring 99 mounted in threaded bushing 95.

It is noted that when tapered dog 96 is withdrawn from tapered hole 21 the entire assembly may be pivoted about traverse rod 20. Traverse rod 20 will continue its reciprocal motion but when tapered dog 96 is engaged in locking groove 102, the pivot block 90 and its associated parts will be stationery relative to the traverse rod 20. When the assembly is pivoted about traverse rod 20, insulated assembly 81 which is attached to pivot block plate 60 breaks contact with insulated power conductor assembly 47. As no power is being supplied to motor 30, motor shaft 34 will stop rotating and the apparatus may be threaded up with one or more strands of yarn.

After motor 30 is threaded up it is only necessary to disengage tapered dog 96 from locking groove 102 and, after pivoting the assembly in the opposite direction, re-engaging tapered dog 96 in tapered hole 21 on traverse rod 20. It is of course understood that a plurality of holes 21 must be drilled along the full length of traverse rod 20, with one hole positioned at each station on the machine.

OPERATION To operate the instant invention supply packages 11 of yarn are placed on creels and yarn Y is threaded through tension devices 12, faller eyes 13 and gathering eye 61.

Assuming that main power switch 111 is closed, the twisting assembly motor will be reciprocating with traverse rod and shaft 34 will be rotating with rapid, periodic reversals of direction. In order to thread up the twister assembly, it is necessary to disconnect same from both the electrical power source and the traverse rod.

This disengagement is performed, with specific reference to FIG. 3, by pulling down on release knob 100 and pushing it to the right, thereby pivoting the entire assembly about traverse rod 20. Tapered dog 96 is disconnected from The hole in traverse rod 20 and knob 100 is released when the dog is in alignment with lockout groove 102. The electrical connection is automatically broken, as the brushes of insulated assembly 81 no longer contact strips 48.

Yarn Y is now passed through shaft 34 and wrapped one or more times around the twist trapping member or pin 32. After passing the yarn through guide 33, the yarn is securely looped around the core of take-up package 41.

The twisting apparatus is put into operation by reversing the manipulation heretofore explained. Tapered dog 96 is disengaged from lock-out groove 102 by pulling out on knob 100 and rotating the assembly in the opposite direction. When tapered dog 96 engages hold 21 in traverse rod 20 the assembly will pick up the reciprocal motion of the traverse rod and, at the same time, the brushes of assembly 81 will contact strips 48. Motor shaft 34 will begin rotating and as power sequence drum 45 revolves about its axis and switches the electrical power supplied to the motor, the direction of the motor shaft's rotation will periodically reverse. As cork roll 40 rotates take-up package 41, the yarn will be wrapped on the take-up package with an alternately reversing twist being constantly imparted to the yarn.

As is apparent, the twister assembly at each individual station on the textile machine may be selectively disconnected for thread-up without interrupting the operation at the other stations.

It is to be noted that the twister motor is placed in close proximity to take-up package 41. With specific reference to FIG. 2 distance P is designated as the Twist Propagating Zone and the length of distance P is one of the factors that affects the amount of twist passed through the false twist spindle and onto take-up package 41.

As previously described, when a yarn strand is moved linearly through a rotating false twist spindle, twist is inserted in the upstream" side and, when steady state conditions are achieved, simultaneously taken out of the downstream" side. It is to be emphasized that this phenomenon occurs only when steady state conditions are achieved.

The operation of the instant device is made possible by the rapid reversals of direction of motor shaft 34 which in turn prevents steady state conditions from being achieved. As such the twist imparted upstream of the motor shaft is not given the opportunity to pass downstream of pin 32 and fully cancel the twist that was imparted downstream" and which was of an opposite hand.

Normally, when steady state conditions are achieved an equal number of twists, for example, S-twist would be imparted upstream and Z-twist would be imparted downstream. As the yarn is moved linearly through the motor shaft or false twist spindle blade the S-twist from the upstream side is pulled around the pin and cancels out the Z-twist downstream of the pin. By rapidly reversing the direction of motor shaft 34 we have found that this downstream cancellation may be prevented and in fact some twist will remain downstream of the motor shaft 34. By positioning the motor assembly a distance P from take-up package 41, all or substantially all of the uncanceled downstream twist may be trapped on take-up package 41.

Take-up package 41 will now be wrapped with yarn having periodically reversing false twist imparted thereto and the package is suitable for further processing as previously described.

EXAMPLE To produce a take-up package of textile yarn with low density or hardness, two supply packages of previously processed denier nylon stretch yarn of opposing torques are placed upon creel 10. The yarns Y are passed through gate tensions 12 which are set at about 3 grams tension and then individually passed through separate faller eyes 13, through centering and gathering eye 61, and through the hollow tube 34, of twister motor 30. The yarns are then wrapped one time around twist trapping member 32 and securely looped around the core of take-up package 41 for winding thereon. The maximum speed of motor 30 is set for about 10,800 R.P.M. by means of motor controller 120, the speed of roll shaft 42 is geared to produce a linear surface speed of roll 40 of about 150 yards per minute, and gears 43 and 44 are selected to produce a repetition rate of two twister motor reversals for every traverse movement of motor 30. Release knob is set so that the assembly engages traverse rod 20 and picks up its reciprocal motion and, simultaneously, cork roll 40 is brought into frictional contact with the core of take-up package 41. Take-up package 41 will now be wound with the strands of yarn Y and as a repetition rate of two twister motor reversals for every traverse movement of motor 30 has been set into the machine, the yarn will have two reversals of twist for every pass along the longitudinal extent of the take-up package.

From one null point between twists to another null point, the twist imparted to the yarn will appear as a true twist. The yarn take-up package thus wound is ready for further processing such as the application of steam or as a supply package for subsequent processing in knitting or weaving fabrics.

In addition to the applications of this invention discussed above, other applications exist and the following are given merely as examples thereof.

The present invention may also be practiced in combination with our present US. Pat. No. 2,864,229 to produce thermally processed yarns under conditions as stated in the patent. It would be understood that the down-twisting elements of the aforementioned patent would be replaced with the up-twister of the instant invention.

As another alternative, the strands of yarn from the plurality of supply packages may be individually passed through conventional false-twist spindles and heaters to first false-twist and heat set each strand and then pass on to the doubling and reversible twisting described above. This combination of machine elements will form a multiple process machine which will continuously spin, double and twist the yarn.

It is understood that the-description and example given herein are merely exemplary and that our invention is to be interpreted only by reference to the amended claims.

We claim:

1. A textile yarn processing machine comprising a traverse means reciprocally mounted on said machine, a mounting plate pivotally mounted on said traverse means, false twist means to impart twist to yarn, said false twist means being carried by said mounting plate, reversing means associated with said false twist means to periodically reverse the direction of said twist imparted to said yarn, take-up means upon which yarn is wrapped positioned in such close proximity to said false twist means that twist downstream of said false twist means is wrapped on said take-up means before steady state false twist conditions which would automatically cancel said twist downstream are achieved, drive means to rotate said take-up package and synchronizing means correlating the reversal of said twist the drive means and the reciprocation of said traverse means, whereby a strand of yarn can be evenly wrapped on said take-up means in an alternately twisted state.

2. The apparatus of claim 1 wherein said mounting plate pivotally mounted on said traverse means comprises locking means for locking said plate to said tra' verse means in either an operative position or an inoperative position, and release means both for disengaging said locking means and for pivoting said mounting plate between said operative and inoperative positions whereby said false twist means may be pivoted to said inoperative position to facilitate threading with said yarn.

3. The apparatus of claim 2 wherein said false twist means comprises an electric motor with a hollow shaft having a twist trapping pin therein and wherein said mounting plate has electrical contact means thereon to contact a power source on said yarn processing machine, said electrical contact means contacting said power source only when said mounting plate is in said operative position.

4. The apparatus of claim 3 wherein said electric motor has three phase windings to facilitate a rapid reversal of magnetic field.

5. In a method of wrapping at least one alternately twisted yarn on a textile yarn take-up package including the steps of passing said yarn through a false twisting means, false twisting said yarn in a given direction, periodically reversing the direction of said twisting, and wrapping said yarn on said take-up package, the improvement comprising said periodic reversals of twist being performed before the achievement of steady state false twisting conditions for each given direction and comprising positioning said take'up package in such close proximity to said false twist means that twist in said yarn downstream of said false twist means remains uncancelled by upstream twist of opposite hand passing through said false twist means and said yarn is wrapped on said take-up package with measurable, alternating twist.

6. The method of alternating the direction of twist imparted to only one strand of multifilament yarn while said yarn is being fed to yarn advancing means comprising false twisting a yarn in a given direction, periodically reversing the direction of said twisting before the achievement of steady state false twisting conditions and concurrently advancing said yarn in said alternately twisted state.

7. The method of alternating the direction of twist imparted to only one strand of multifilament yarn while said yarn is being wrapped on a take-up package comprising false twisting a yarn in a given direction, periodically reversing the direction of said twisting before the achievement of steady state false twisting conditions and concurrently wrapping said take-up package with said alternately twisted yarn.

8. The method of wrapping a textile yarn take-up package comprising passing only one strand of multifilament yarn through a false twister, rotating said false twister in a given direction, periodically reversing the direction of rotation of said false twister, positioning a take-up package in such close proximity to said false twister that twist downstream of said false twist means is wrapped on said take-up package before steady state false twist conditions which would automatically cancel said twist downstream are achieved such that said yarn is wrapped on said take-up package with a twist of alternating direction imparted thereto.

9. The method of wrapping a textile yarn take-up package comprising passing only one strand of multifilament yarn through a guide means false twisting said yarn in a given direction as it passes through said guide means, periodically reversing the direction of said twist, positioning a take-up package in such close proximity to said guide means that twist downstream of said guide means may be wrapped on said take-up package before steady state false twist conditions which would automatically cancel said twist downstream are achieved, and simultaneously with said twisting causing said guide means to reciprocate relative to said take-up package and rotating said take-up package such that said yarn is evenly distributed on said take-up package with a periodically reversing twist imparted thereto.

Claims

2. The apparatus of claim 1 wherein said mounting plate pivotally mounted on said traverse means comprises locking means for locking said plate to said traverse means in either an operative position or an inoperative position, and release means both for disengaging said locking means and for pivoting said mounting plate between said operative and inoperative positions whereby said false twist means may be pivoted to said inoperative position to facilitate threading with said yarn.

5. In a method of wrapping at least one alternately twisted yarn on a textile yarn take-up package including the steps of passing said yarn through a false twisting means, false twisting said yarn in a given direction, periodically reversing the direction of said twisting, and wrapping said yarn on said take-up package, the improvement comprising said periodic reversals of twist being performed before the achievement of steady state false twisting conditions for each given direction and comprising positioning said take-up package in such close proximity to said false twist means that twist in said yarn downstream of said false twist means remains uncancelled by upstream twist of opposite hand passing through said false twist means and said yarn is wrapped on said take-up package with measurable, alternating twist.