JP2944647B1 - Method and apparatus for manufacturing alternate twisted yarn - Google Patents

Abstract

An object of the present invention is to provide a method and an apparatus capable of manufacturing an alternately twisted yarn by simple and inexpensive means. SOLUTION: The pulley 2 is hung on a pulley 2 so as to be bent in the middle of the running path of the yarn 1, and the shaft 1 of the pulley 2 is inclined with respect to a plane on which the yarn 1 runs, so that the yarn 1 is a flange of the pulley 2. By causing the yarn 1 to run in the opposite direction on both sides of the pulley 2 by running while contacting the inner surface of the portion 2a,
Is perpendicular to the plane on which the yarn 1 travels to eliminate contact of the yarn 1 with the inner surface of the flange portion 2a of the pulley 2 so that the yarn 1
The alternately twisted yarn is manufactured by alternately repeating the running of the yarn 1 in a neutral state in which no twist is applied by the neutral / inclination switching means 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing an alternately twisted yarn in which the twisting directions are alternately different along the longitudinal direction of the yarn (Z twisted regions and S twisted regions are alternately present). is there.

[0002]

2. Description of the Related Art Such an alternately twisted yarn can generate irregular wrinkles by post-processing, so that a soccer ground or a wrinkled ground can be easily manufactured.

As a means for producing this alternately twisted yarn, the present inventor has already proposed Japanese Patent Application Laid-Open No. Hei 8-246280. In this proposal, the yarn is continuously or intermittently pulled out from a stationary feeding bobbin, inserted into a twisting device that rotates intermittently in one direction, intermittently twisted, and wound on a winding bobbin. After that, heat set. As the twisting device, a pin provided with a V-groove for winding the thread in the center of the inside of the rotating cylindrical body was wound around in the direction perpendicular to the axis, and a nipper for gripping the thread using centrifugal force was provided. In any case, the yarn is twisted by the rotation of the cylindrical body when passing through the cylindrical body, and the twist given to the yarn is before and after the twisting device (the entrance side and the delivery side). In the opposite direction.

In this case, the total number of twists generated before and after the twisting device is the same, but the yarn is wound around the winding bobbin even during the intermittent rotation stop period of the twisting device. As the twist on the side is passed through the twisting device and sent to the sending side, which untwists the twist given to the sending side, the twisting is eliminated as it is. However, in practice, the yarn on the sending side cannot be untwisted by being wound on the take-up bobbin, so the number of twists remaining untwistable on the yarn on the sending side is the total twist on the ingress side. Less than the number. The extra twist sent from the entering side to the sending side is wound up on a winding bobbin as a twist opposite to the previous twist. Next, the twisting device resumes intermittent rotation, and a new twist is applied to the sending side and the entry side in the opposite direction, and the remaining twist is untwisted at the sending side, and then a new twist is applied. Then, the rotation is stopped and the above phenomenon occurs, and thereafter, the rotation and the stop are repeated to repeat the above phenomenon. Thereby, an alternately twisted yarn is manufactured.

[0005]

However, in the above-mentioned proposal, it is necessary to positively drive the cylindrical body serving as the twisting device in the direction in which the yarn is twisted, and to control the rotation and stop alternately and repeatedly. However, there is a problem in that the structure of the twisting device becomes complicated, and equipment costs, operation costs, maintenance management costs, and the like become expensive.

[0006] The present invention has been proposed in view of the above problems, and an object of the present invention is to provide a method and an apparatus capable of producing an alternately twisted yarn by simple and inexpensive means.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a pulley which is placed on a pulley so as to be bent in the middle of a running path of a yarn, and which is mounted on a plane on which the yarn runs. By inclining the shaft and running the yarn in contact with the inner surface of the collar of the pulley, the yarn is twisted in the opposite direction on both sides of the pulley, and the axis of the pulley is perpendicular to the plane on which the yarn runs. By alternately repeating the running of the yarn in a neutral state where the yarn is not twisted on both sides of the pulley by eliminating the contact of the yarn with the inner surface of the collar of the pulley, alternately twisted yarn is manufactured. is there.

That is, when the yarn is hung on the pulley so that the running path thereof is bent, the groove bottom of the pulley that comes into contact with the yarn is rotated by frictional force due to running of the yarn by winding the yarn. .

When the axis of the pulley is inclined with respect to the plane on which the yarn travels, the yarn entering the pulley comes into contact with the inner surface of one (eg, upper) flange portion in the groove of the pulley and is sent out from the pulley. The yarn to be brought into contact with the inner surface of the other (for example, lower) flange portion in the groove of the pulley.

In this case, the pulley is given a rotation by a frictional force to the yarn running at the bottom of the groove, and the direction of rotation of the flange of the pulley is substantially perpendicular to the running direction of the yarn. The yarn that comes into contact with the inner surface of the collar of the pulley is twisted by the inner surface of the collar of the pulley.

Further, since the inner surface of the collar portion of the pulley where the yarn contacts the entrance side and the delivery side of the pulley is upside down as described above, the twist given to the yarn is different from the entrance side of the pulley and the delivery side. The opposite is true on the side.

On the other hand, when the axis of the pulley is perpendicular to the plane on which the yarn runs, the yarn comes into non-contact with the inner surface of the collar portion of the pulley, and runs only in contact with the groove bottom of the pulley. For this reason, no twist is given to the yarn. However, since the yarn continues to travel, the twist given to the entrance side of the pulley passes through the pulley and is sent to the sending side. As a result, the same phenomenon as that described in the section of the related art will occur, and if this is repeated, an alternately twisted yarn is manufactured.

As described above, according to the present invention, the conventional means for positively driving the twisting device to rotate is unnecessary. That is, in the present invention, an alternately twisted yarn can be manufactured only by repeatedly inclining or returning the pulley shaft to neutral.

Further, according to the present invention, the pulley is composed of a plurality of front pulleys arranged in parallel and one rear pulley, and the plurality of front pulleys have a traveling path of a plurality of yarns traveling in parallel. It is hung on the way so as to be in a bent state, and then, while being threaded through a concentrator, it is hung on one rear pulley to bend and run. The axis of each front pulley and the axis of the rear pulley are controlled by computer control in any mode. In order to manufacture any alternate twisted yarn by tilting operation, alternate twisted yarns having various variations by changing the inclination mode of each front pulley and the tilting mode of the rear pulley are switched by computer software, etc. Easy and easy to obtain.

In the present invention, the direction of inclining the pulley axis with respect to the plane on which the yarn travels is alternately inclined in the opposite direction with respect to the neutral state, thereby producing an alternately twisted yarn having a change. Things.

Further, in the present invention, the pulley has an inner / outer double structure comprising an inner pulley for forming a groove bottom and an outer pulley for forming a flange portion, wherein the inner pulley is freely rotatable, and the outer pulley is rotated in forward and reverse directions. The rotation speed can be controlled, thereby producing a more varied alternating twisted yarn.

Further, the present invention provides a pulley which is installed rotatably in the middle of a running path of a yarn and is hung so as to bend the running path of the yarn, and a shaft of the pulley with respect to a plane on which the yarn runs. It is provided with a neutral / inclination switching means for performing a switching operation between an orthogonal neutral state and an inclined twist applying state, thereby enabling a method of manufacturing an alternately twisted yarn to be implemented.

Further, the present invention provides the pulley having an inner / outer double structure comprising an inner pulley for forming a groove bottom and an outer pulley for forming a flange portion, wherein the inner pulley is freely rotatable, and the outer pulley is driven by a motor, or The forward / reverse rotation direction and the rotation speed can be controlled by the air blowing direction and the blowing pressure, thereby making it possible to carry out a method of manufacturing an alternately twisted yarn that is rich in changes.

Further, the present invention is to improve the action of imparting twist to the yarn by making the inner surface of the collar portion of the pulley rough.

Further, the present invention provides the pulley having a polygonal, elliptical, or other irregular shape on the outer peripheral surface thereof,
Thereby, the action of imparting twist to the yarn is changed.

Further, according to the present invention, one or both of the front pulley and the rear pulley can be rotated via a tilted support shaft in a cylindrical body which can be driven to rotate forward and reverse around a central axis. Alternately twisted yarns may be produced by replacement application to a twisting spindle with a supported sheave. In this case,
Since alternate twisted yarn can be produced by forcibly imparting twist to the yarn, strong twisted alternate twisted yarn can also be easily produced.

[0022]

1 (A), 1 (B) and 1 (C) are perspective views for explaining the principle of a method for producing an alternately twisted yarn according to the present invention, and FIGS.
(A), (B) and (C) are side views for explaining the principle of the method for producing an alternately twisted yarn according to the present invention.

As shown in FIGS. 1 and 2, the method for producing an alternately twisted yarn according to the present invention is carried out on a pulley 2 so as to bend in the middle of the traveling path of the yarn 1 and a plane on which the yarn 1 travels. The shaft 1 of the pulley 2 is tilted with respect to the
a) The yarn 1 is twisted in the opposite direction on both sides of the pulley 2 by running while being in contact with the inner surface, and the shaft 3 of the pulley 2 is By alternately repeating running of the yarn 1 in a neutral state in which the yarn 1 is not twisted on both sides of the pulley 2 without contact of the yarn 1 with the inner surface of the flange portion 2a, an alternately twisted yarn is manufactured. Things. The pulley 2 to be used preferably has a deep groove.

The traveling route of the yarn 1 may be, for example, on the way from the feeding bobbin to the winding bobbin. FIG. 1 illustrates the case where the auxiliary pulley 4 is used, but this is not an essential member.

The above-described pulley 2 exemplifies a case in which the bending angle of the traveling path of the yarn 1 is set to approximately 90 °.
An arbitrary bending angle of 80 ° or less can be set.

As shown in FIG. 3, the support member 5 of the pulley 2 exemplifies a case in which the shaft 3 of the pulley 2 is a double-supported type, but may be a cantilevered type.

The support member 5 of the shaft 3 of the pulley 2 is rotatably supported by a suitable stationary member 7 around a neutral / inclination switching shaft 6, and the switching shaft 6 is neutralized / inclined via a lever 8. By performing a switching operation by the operating member 9a of the switching means 9, the shaft 3 of the pulley 2 can be switched and held between a neutral position orthogonal to a plane on which the yarn 1 travels and a position inclined.

The neutral / inclination switching means 9 comprises an air cylinder, a rotary solenoid, a cam, and other appropriate means. Note that the lever 8 can be manually switched.

The neutral / incline switching shaft 6 is provided with a thread 1
Is supported by the stationary member 7 so as to be rotatable on a plane formed by the traveling path of the thread 1 and on a bisector of a bending angle of the traveling path of the yarn 1.

In this case, the direction of inclining the shaft 3 of the pulley 2 with respect to the plane on which the yarn 1 travels by the neutral / inclination switching means 9 may be performed only at two positions between the neutral state and the right side. You may implement so that it may incline in the opposite direction alternately to the right side and the left side with respect to a state, and may switch in three positions. Alternating twist yarns with three changes can be manufactured at three positions more than at two positions.

FIG. 4 shows another embodiment of the pulley 2 used in the present invention.
The inner pulley 2b has an inner / outer double structure including an inner pulley 2b for forming a groove bottom and an outer pulley 2c for forming a flange. The inner pulley 2b is loosely fitted to the shaft 3 so as to be freely rotatable, and the outer pulley 2c is fixed to the shaft 3. The shaft 3 can be controlled in the forward and reverse rotation directions and rotation speed by a motor 2d via an appropriate control device. According to this configuration, it is possible to apply a stronger twist or weaken the twist, and it is possible to change the application of twist to the yarn 1 in various ways, and it is possible to manufacture an alternately twisted yarn with more variety. .

FIG. 5 shows still another embodiment of the pulley 2 used in the present invention. In this embodiment, the pulley 2 has an inner pulley 2b for forming a groove bottom and an outer pulley 2 for forming a flange.
c and the shaft 3 are freely rotatable by separate bearings, and the outer pulley 2c for forming a flange is rotated on the principle of an air motor. Specifically, an outer pulley 2c for forming a flange on both sides of the inner pulley 2b for forming a groove bottom,
An impeller portion 2f is formed on one of the outer peripheral portions of the boss portions 2c ′ and 2c ′ of 2c.
Is mounted on a part of the supporting member 5 through the holder 2h. The air nozzles 2g are tangentially attached to the impeller 2f, and are installed at two symmetrical positions for forward and reverse rotation. To each of the air nozzles 2g and 2g, air with an adjusted pressure is selectively supplied to one of the air nozzles from an air supply source via a pressure adjustment valve and a switching valve,
In some cases, the air nozzles 2g and 2g are configured to have a differential pressure and supply the air nozzles in parallel so that the number of rotations and the rotational direction are adjusted and controlled by the degree of the differential pressure. The outer pulleys 2c, 2c for forming the flange portions on both sides in FIG.
The nut 3 'is tightened on the shaft 3 so as to rotate integrally. Air defense disks 2i, 2i are provided on the bosses 2c ', 2c' of the outer pulleys 2c, 2c for forming the flanges on both sides, so that the traveling yarn is not adversely affected by the air.

Further, according to the present invention, the inner surface of the flange portion 2a of the pulley 2 is roughened, whereby the action of imparting twist to the yarn 1 can be improved. The pulley 2 may be made of metal, synthetic resin, or ceramics. The pulley 2 is configured to prevent charging of the yarn 1 in order to cope with a case where static electricity is generated by contact with the yarn 1. Is preferred. Further, the pulley 2 may have a contour shape of the outer peripheral surface of the flange portion 2a which is not circular but polygonal, elliptical, or other irregular shape. By doing so, the action of imparting twist to the yarn 1 is varied in various ways, and it is possible to manufacture an alternately twisted yarn with further variations.

The first embodiment of the present invention has the above-described structure. Next, the procedure for producing an alternately twisted yarn will be described with reference to FIGS.

First, as shown in FIG. 1, when the yarn 1 is hung on the pulley 2 so that its running path is bent, the pulley comes into contact with the yarn 1 by running the yarn 1 by winding the yarn 1 or the like. The groove bottom of No. 2 is given rotation by frictional force.

As shown in FIG. 2A or 2C, when the shaft 3 of the pulley 2 is inclined with respect to the plane on which the yarn 1 runs, the yarn 1 entering the pulley 2 The thread 1 coming into contact with the inner surface of one (for example, upper side in (A)) 2a of the pulley 2 in the groove, and the other thread (for example, lower side in (A)) in the groove of the pulley 2 It contacts the inner surface of the portion 2a.

In this case, the pulley 2 is given a rotation by a frictional force to the yarn 1 on which the groove bottom 2e runs, and the rotation direction of the flange 2a of the pulley 2 is a direction substantially orthogonal to the running direction of the yarn 1. 1 (A) and (C) in FIG. 1, the thread 1 that comes into contact with the inner surface of the collar 2 a of the rotating pulley 2 is appropriately positioned upstream of the pulley 2 and the approach side by the inner surface of the collar 2 a of the pulley 2. , And between the pulley 2 and the auxiliary pulley 4 on the delivery side.

Further, the yarn 1 is connected between the approach side and the delivery side of the pulley 2.
As shown in FIG. 2A or 2C, the inner surface of the flange 2a of the pulley 2 with which the pulley 2 contacts is turned upside down. And conversely. That is, in the state of (A), the yarn 1 on the entry side is twisted clockwise, and the yarn 1 on the sending side is twisted counterclockwise. In the state of (C), the situation is reversed.

On the other hand, as shown in FIGS. 1B and 2B, when the axis 3 of the pulley 2 is perpendicular to the plane on which the yarn 1 runs, the yarn 1 The inner surface 2a is brought into a non-contact state, and the yarn 1 travels in contact with only the groove bottom 2e of the pulley 2. Therefore, no twist is given to the yarn 1. However, since the yarn 1 continues to travel, the twist given to the entrance side of the pulley 2 passes through the pulley 2 and is sent to the sending side. Thereby, the twist on the sending side is untwisted by the twist on the ingress side. However, since the twist on the sending side is sequentially wound on the winding bobbin over the auxiliary pulley 4, the twist is fixed without being untwisted. Then, the twist that has been subtracted from the number of twists already wound on the winding bobbin is untwisted, but since the number of twists on the ingress side is larger, this amount of twist remains, and the winding bobbin continues winding Taken.
This twist is a twist in the opposite direction to the previous twist, whereby a wire having a different twist direction is continuously wound. Next, if the shaft 3 of the pulley 2 is tilted again, the same twist is applied in opposite directions on both sides of the pulley 2. When the shaft 3 of the pulley 2 is returned to the neutral position, the reverse twist is wound around the winding bobbin by the above-described phenomenon. Thereafter, by repeating this, an alternately twisted yarn is manufactured.

As described above, the present invention is applied to the middle of a yarn traveling route such as a twisting machine or a twining machine, and is particularly applied to a preparation process of a woven yarn for manufacturing a soccer ground or a wrinkled ground. Is preferred.

Next, a second embodiment of the present invention will be described with reference to FIGS. 6A and 6B and FIG. In the second embodiment of the present invention, as shown in FIGS. 6A and 6B, a plurality of pulleys (the figure shows the case of three pulleys) and front pulleys 21, 22, and 23 are arranged in parallel. It is composed of one rear pulley 24 and a plurality of front pulleys 21, 22, and 23 running in parallel (three are shown in the figure).
13, so as to be bent in the middle of the traveling route, and then, while being threaded through the bunching device 16, is hung on one rear pulley 24 to bend and travel. To each of the front pulleys 11, 1
2, 13 shafts 31, 32, 33 and shaft 34 of rear pulley 24
Are tilted in an arbitrary manner by computer control to produce an arbitrary alternately twisted yarn 14. Each of the front pulleys 21, 22, 23 and the rear pulley 24
Means that the configuration shown in FIGS. 3 to 5 is applied.

Since the second embodiment of the present invention has the above structure, for example, each of the front pulleys 21, 22, 23 and the rear pulley 2
4 are simultaneously inclined alternately as shown by a dotted line and a solid line, as shown in FIG. 7, three twisted yarns in which S-twist and Z-twist are synchronously provided by front pulleys 21, 22, and 23. After the yarns 11, 12, and 13 are combined, a yarn 14 in which the S twist and the Z twist are twisted in synchronism with the three yarns by the rear pulley 24 is obtained.

Further, in FIG. 6 (A), if the shafts 31, 33 of the two outer front pulleys 21, 23 are inclined in opposite directions, the yarns 11, 13 on both sides are oppositely twisted, and There are various variations depending on the combination of the difference in the inclination mode between the front pulleys and the inclination mode of the rear pulleys by computer control, such as changing the switching cycle of the axis inclination of each of the pulleys 21 to 24, changing the start base point, and the like. Alternating twist yarn can be obtained easily and easily.

The present invention also relates to the front pulley 2 shown in FIG.
The twist spindle 40 shown in FIG. 8 is applied to one or both of the first pulley 24,
Alternatively, the twisted yarn may be manufactured by forcibly twisting 7.

The twisting spindle 40 shown in FIG. 8 has a support shaft 40b inclined inside a cylindrical body 40a, and U- or V-grooves 4 for winding the yarn 17 around the center of the support shaft.
A grooved wheel 40d provided with a shaft 0c is rotatably mounted on a shaft. The cylindrical body 40a is rotatably supported on its outer peripheral side by a bearing (not shown), and is connected to a rotational drive source that can rotate forward and reverse. An electric motor or an air motor can be used as the rotation drive source. The support shaft 40b which supports the sheave 40d of the twist spindle 40 is a sheave 40.
The thread 17 deviated from the center of the circle and the singing 40a by a distance equal to the radius of d and wrapped around the groove 40c of the sheave wheel 40d.
Is located on the central axis of the cylindrical body 40a.

The twist spindle 40 is arranged so that the central axis of the cylindrical body 40a coincides with the yarn path. The thread 17 is inserted into the cylindrical body 40a, wound only once around the sheave 40d, and pulled out from the opposite side. Due to the fact that the sheave 40d is attached to the inclined support shaft 40b, both ends of the thread 17 wound around the sheave 40d are drawn obliquely from the grooves 4c and enter the sheave 40d. The incoming and outgoing yarns do not contact. By using such a sheave wheel 40d, in a case where the yarn on the entry side is strongly twisted and the twist is untwisted when the yarn is sent out from the sheave 40d, the yarn on the entry side is used. It is possible to avoid a situation in which the yarn on the sending side is rubbed with each other to generate fluff, or the yarn is entangled and the yarn is broken.

[0047]

According to the method of the present invention, the conventional means for positively driving the twisting device to rotate is unnecessary. That is, in the present invention, an alternately twisted yarn can be manufactured only by repeatedly inclining or returning the pulley shaft to neutral.

Further, according to the present invention, the pulley is constituted by a plurality of front pulleys arranged in parallel and one rear pulley, and the plurality of front pulleys have a traveling path of a plurality of yarns running in parallel. It is hung on the way so as to be in a bent state, and then, while being threaded through a concentrator, it is hung on one rear pulley to bend and run. The axis of each front pulley and the axis of the rear pulley are controlled by computer control in any mode. In order to manufacture any alternate twisted yarn by tilting operation, alternate twisted yarns having various variations by changing the inclination mode of each front pulley and the tilting mode of the rear pulley are switched by computer software, etc. Easy and easy to obtain.

Further, in the present invention, by alternately inclining the axis of the pulley with respect to the plane on which the yarn travels in the opposite direction to the neutral state, it is possible to manufacture an alternately twisted yarn having a change. .

Further, according to the present invention, the pulley has an inner / outer double structure comprising an inner pulley for forming a groove bottom and an outer pulley for forming a flange portion, the inner pulley can be freely rotated, and the outer pulley can be rotated in the forward and reverse directions. By making the rotation speed controllable, alternately twisted yarns with more variety can be manufactured.

Further, according to the apparatus of the present invention, an alternately twisted yarn can be manufactured at a low cost with a simple structure. Further, in the present invention, the inner surface of the collar portion of the pulley is made rough, whereby the action of imparting twist to the yarn can be improved. Further, in the present invention, the contour shape of the outer peripheral surface of the collar portion of the pulley is made to be polygonal, elliptical, or any other irregular shape, whereby various effects can be imparted to the twist imparting action to the yarn.

Further, according to the present invention, one or both of the front pulley and the rear pulley can be rotated via a tilted shaft in a cylinder which can be driven to rotate forward and reverse around a central axis. Alternately twisted yarns may be produced by replacement application to a twisting spindle with a supported sheave. In this case,
Since alternate twisted yarn can be produced by forcibly imparting twist to the yarn, strong twisted alternate twisted yarn can also be easily produced.

[Brief description of the drawings]

1 (A), 1 (B) and 1 (C) are perspective views for explaining the principle of a method for producing an alternately twisted yarn according to the present invention, and FIGS. 1 (A) and 1 (C) show the pulley axes inclined in opposite directions. (B) shows a neutral state.

2 (A), 2 (B) and 2 (C) are side views for explaining the principle of the method for producing an alternately twisted yarn according to the present invention, wherein (A) and (C) have the axes of the pulleys inclined in opposite directions to each other. (B) shows a neutral state.

FIG. 3A is a partially cutaway side view showing a first embodiment of a pulley used in the present invention, FIG. 3B is an end view seen from the right side, and FIG. 3C is a partially cutaway plan view.

FIG. 4 is a partially cutaway side view showing a second embodiment of the pulley used in the present invention.

FIG. 5 is a partially cutaway side view showing a third embodiment of a pulley used in the present invention.

FIG. 6A is a schematic plan view showing a second embodiment of the present invention, and FIG. 6B is a side view thereof.

FIG. 7 is an explanatory view showing an example of forming an alternately twisted yarn in a second embodiment of the present invention.

FIG. 8 is a schematic longitudinal sectional side view of a main part of a twist spindle used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thread 2 Pulley 2a Collar 2b Inner pulley 2c Outer pulley 2d Motor 2e Groove bottom 3 Axis 4 Auxiliary pulley 5 Supporting member 6 Neutral / incline switching shaft 7 Stationary member 8 Lever 9 Neutral / incline switching means 9a Operating members 11-14 17 Yarn 21-23 Front pulley 24 Rear pulley 31-34 Shaft 40 Twist spindle 40a Cylindrical body 40b Support shaft 40c Groove 40d Groove

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) D01H 7/02 D01H 7/92 D02G 1/08

Claims (9)

(57) [Claims] 1. A pulley is mounted on a pulley so as to be bent in the middle of a traveling path of a yarn, and the axis of the pulley is inclined with respect to a plane on which the yarn travels so that the yarn comes into contact with an inner surface of a flange portion of the pulley. By running, the yarn is twisted in the opposite direction on both sides of the pulley, and the axis of the pulley is perpendicular to the plane in which the yarn runs, eliminating the contact of the yarn with the inner surface of the flange of the pulley and the pulley. And alternately repeating running the yarn in a neutral state in which the yarn is not twisted on both sides of the yarn. 2. The pulley is composed of a plurality of front pulleys arranged in parallel and one rear pulley.
Hook so that the middle of the traveling path of the plurality of yarns running in parallel is in a bent state, and then, while tying through a bunching device, hang on one rear pulley and bend and run. The method for producing an alternately twisted yarn according to claim 1, wherein an arbitrary twisted yarn is manufactured by inclining the pulley shaft and a shaft in an arbitrary manner by computer control. 3. The method according to claim 1, wherein the direction in which the axis of the pulley is inclined with respect to the plane on which the yarn travels is alternately inclined in the opposite direction to the neutral state. A method for producing the alternately twisted yarn according to the above. 4. The pulley has an inner / outer double structure comprising an inner pulley for forming a groove bottom and an outer pulley for forming a flange portion. The inner pulley can be freely rotated, and the outer pulley can be controlled in the forward / reverse rotation direction and rotational speed. The method for producing an alternately twisted yarn according to claim 1, 2, or 3. 5. A pulley that is freely rotatable in the middle of the running path of the yarn and is hung so as to bend the running path of the yarn, and a neutral state in which the axis of the pulley is perpendicular to the plane on which the yarn runs. And a neutral / inclination switching means for performing a switching operation between a twisted state and an inclined twist application state. 6. The pulley has an inner / outer double structure comprising an inner pulley for forming a groove bottom and an outer pulley for forming a flange portion, wherein the inner pulley is freely rotatable, and the outer pulley is driven by a motor or in a direction in which air is blown. The apparatus for producing an alternately twisted yarn according to claim 5, wherein the forward and reverse rotation directions and the rotation speed can be controlled by the spray pressure. 7. The alternate twisted yarn producing apparatus according to claim 5, wherein the inner surface of the collar portion of the pulley is roughened. 8. The apparatus according to claim 5, wherein the outer peripheral surface of the collar portion of the pulley has a polygonal shape, an elliptical shape, or another irregular shape. 9. A sheave rotatably supported via a tilted support shaft in a cylindrical body capable of driving one or both of a front pulley and a rear pulley around a center axis in a forward / reverse rotation. 3. The alternate twisted yarn manufacturing apparatus according to claim 2, wherein said twisted spindle is replaced and applied.