JPH0959829A - Twisting of fiber assembly, apparatus for twisting and production of spun yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the efficient performance of twisting and untwisting, the speed-up of yarn manufacturing and the achievement of stable twisting. SOLUTION: A fiber assembly S runs and passes between a pair of running bodies t10 and t10' which run crossing to each other, and the fiber assembly is imparted with twisting and feed by the running bodies. The fiber assembly is nipped so that the components, in the feed direction of the fiber assembly, of the speeds of the running bodies substantially coincide with the running speed of the fiber assembly at a nip point.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a twisting method of a fiber assembly, a twisting device, and a twisting device for twisting a fiber aggregate such as a sliver or a bundle of filaments which is an aggregate of short fibers. The present invention relates to a spun yarn manufacturing method for manufacturing spun yarn.

[0002]

2. Description of the Related Art Conventionally, a first air nozzle has been used in a fiber assembly by using a first air nozzle in which the swirling directions of air flows are opposite to each other and a second air nozzle located downstream of the first air nozzle. A kind of united spun yarn in which a twist opposite to the twisting direction is applied by the second air nozzle, and the fibers are wound around the core fiber that is almost untwisted by the untwisting action after the second air nozzle. A twisting method and a twisting apparatus for a fiber assembly for producing a fiber are known.

[0003]

FIG. 4 is a schematic explanatory view as an example of the conventional twisting method and twisting device for a fiber assembly described above, and the yarn produced by the twisting method of the present invention and the conventional method. The problem to be solved by the present invention will be described with reference to FIG. 5, which is a front view of a yarn manufactured by the twisting method of No. 1.

In FIG. 4A, reference numeral 1 is a fiber supply roller composed of a pair of nipping rollers such as a front roller of a draft device of a spinning machine and a feed roller of a fiber processing machine, and 2 is a fiber supply roller 1. The downstream side (the direction away from the fiber supply roller 1, that is, the left side direction,
It is called "downstream side". ) Is a first air nozzle having an air injection nozzle for generating a swirling air flow, and 3 is a first air nozzle 2 arranged downstream of the first air nozzle 2. Is a second air nozzle having an air jet nozzle for generating an opposite swirling air flow, and 4 is a pair for sandwiching the manufactured yarn Y and sending it out in a winding package direction (not shown). It is a nip roller consisting of a roller.

First, the fiber assembly S discharged from the fiber supply roller 1 passes through the first air nozzle 2 and then the second air nozzle 3.
And then twisted by the swirling air flow of the second air nozzle 3 to cause the nip point 1 of the fiber supply roller 1 to move.
When the twist reaches a, most of the fibers (hereinafter, "core fiber")
Called. ) Is twisted and bundled. On the other hand, the second
The remaining fibers (hereinafter, referred to as “wound fibers”) that have not been twisted and focused by the air nozzle 3 are swirled by the swirling air flow opposite to that of the second air nozzle 3 of the first air nozzle 2. The core fiber twisted by the second air nozzle 3 is wound around the core fiber in the direction opposite to the twisting direction of the core fiber.

The twist imparted to the core fiber by the second air nozzle 3 begins to untwist when it passes through the twisting region of the second air nozzle 3. , The wound fiber that is wound around the core fiber in the direction opposite to the twisting direction of the core fiber is unwound around the core fiber more strongly by untwisting in the same direction as the twist direction of the wound fiber, As a result, a kind of united spun yarn in which the wound fiber is wound around the core fiber which has been twisted to be substantially non-twisted is manufactured.

As described above, the fiber assembly S is twisted by the second air nozzle 3, but since the fiber assembly S is twisted by the swirling air flow,
Compared with mechanical twisting by sandwiching two rollers,
The efficiency is low, and therefore, the swirling rotational speed of the swirling air flow does not directly effect the twisting of the fiber assembly S, and the efficient twisting,
Untwisting work cannot be performed. Therefore, as shown in FIG. 4B showing the number of twists per unit length of the core fiber of the fiber assembly S between the fiber supply roller 1 and the nip roller 4, the fiber assembly by the second air nozzle 3 The untwisting operation of the body S continues from the second air nozzle 3 to the nip roller 4, and when it reaches the nip roller 4, it becomes almost zero.

As shown in FIG. 4B, the number of twists per unit length imparted to the core fibers of the fiber assembly S by the second air nozzle 3 is the twisting of the second air nozzle 3. It is the largest in the region, decreases from the second air nozzle 3 toward the fiber supply roller 1, decreases from the second air nozzle 3 toward the nip roller 4, and is almost zero at the nip roller 4. Become.

As described above, in the conventional method and apparatus for twisting a fiber assembly, the fiber assembly S is twisted and untwisted by the swirling airflow of the second air nozzle 3. Therefore, since the twisting and untwisting efficiency is low, the production speed of the yarn Y cannot be increased, and the winding of the wound fiber around the core fiber is performed during the ballooning in the untwisting region. However, there is a problem in that the fiber end is ejected from the core fiber due to centrifugal force to form fluff, and the yarn Y having many fluffs is manufactured. Further, the untwisting operation of the fiber assembly S is gradually performed between the second air nozzle 3 and the nip roller 4, and the core fiber is loosened due to the magnitude of the tension between the front roller and the nip roller. In this state, the wound fiber is wound around the core fiber, so the cross section of the yarn Y does not become round,
There is a problem in that a part of the surface becomes flat (as shown in FIG. 5B, it becomes squiggly).

An object of the present invention is to solve the problems of the above-described conventional twisting method and twisting apparatus for fiber aggregates, and to provide a twisting method and twisting apparatus for fiber aggregates with little twist fluctuation. Especially.

[0011]

In order to achieve the above-mentioned object, the present invention firstly comprises running a fiber assembly,
The fiber assembly is passed between a pair of traveling bodies that cross each other to give twist and feed to the fiber assembly by the pair of traveling bodies, and a component of the pair of traveling bodies in the fiber assembly feeding direction. The fiber assembly is sandwiched so that the traveling speed of the fiber assembly substantially matches the traveling speed of the fiber assembly at the nip point. Secondly, the fiber assembly that has passed through the front roller of the draft device is It is introduced into a twisting device that applies twist by sandwiching the aggregate, and the twist generated in the twisting device is propagated to the front roller, and the twist is eliminated within the contact range with the yarn in the twisting device. Thirdly, a pair of running bodies that cross each other and travel are provided, and at least a contact portion of the pair of running bodies with the fiber assembly is formed of an elastic member, and A pair of The row bodies are pressed against each other with a predetermined pressure to elastically deform the contact portion with the fiber assembly, and at least one contact portion with the fiber assembly of the traveling body is formed into a convex curved surface. .

[0012]

EXAMPLE FIG. 1 is a perspective view of a twisting device for a fiber assembly according to the present invention. FIG. 1 is a vertical sectional view taken along the axis of a twisting unit constituting the twisting device for a fiber assembly according to the present invention. Figure 2
Also, the twisting method and twisting device of the fiber assembly of the present invention will be described with reference to FIG. 3, which is a schematic explanatory view of the twisting method and twisting device of the fiber aggregate of the present invention, but the gist of the present invention The present invention is not limited to this embodiment as long as it does not exceed the above.

Reference numeral 5 denotes a fiber supply roller similar to the fiber supply roller 1 shown in FIG. 4, and specifically, a front roller of a drafting device for drafting a fiber aggregate S such as a sliver made of staple fibers. Is. Reference numeral 6 is an air nozzle similar to the first air nozzle 2 having an air jet nozzle for generating a swirling and suction air flow, which is arranged on the downstream side of the fiber supply roller 5. T is a twisting member composed of a pair of twisting units having rotating shafts arranged so as to intersect with each other, which will be described later, and is provided on the downstream side of the air nozzle 6. 7
Is a nip roller similar to the above nip roller 4, that is, a yarn feeding roller.

The fiber assembly S sent from the fiber supply roller 5 is sucked and focused by the air nozzle 6, and the core fiber of the fiber assembly S that has been focused is twisted by the twisting member T to the fiber supply roller 5. Between the twisting member T and
Twisting in the direction opposite to the twist applied by the air nozzle 6 is applied, and the wound fiber is wound around the core fiber by the air nozzle 6 in the direction opposite to the twist direction of the core fiber. The twist imparted to the core fiber by the twisting member T is instantly untwisted at a time when it passes through the nip point of the twisting member T and before it passes through the contact region of the twisting member T, as described later. , By untwisting the core fiber, the wound fiber wound around the core fiber in the direction opposite to the twisting direction of the core fiber is untwisted in the same direction as the twisted direction of the wound fiber, and the core fiber is instantly released. A kind of bound spun yarn in which the wound fiber is wound around the core fiber which is wound around the core and untwisted to be almost non-twisted. The yarn Y manufactured in this manner is pulled out by the nip roller 7 and then wound up in a winding package (not shown).

Next, a twisting member T consisting of a pair of twisting units T1 and T2 arranged on the downstream side of the air nozzle 6 will be described.

Reference numeral t1 denotes a vertical frame, and one twisting unit T of the twisting member T is provided above the vertical frame t1.
1 is provided. t2 is a horizontal frame attached approximately in the middle of the vertical frame t1, and the horizontal frame t
The other twisting unit T2 of the twisting member T is disposed at the tip of the twisting member 2.

Next, the twisting units T1, T2, etc. will be described. Since the twisting units T1, T2 have the same structure and attachment means, the twisting unit T1 arranged on the vertical frame t1 will be described. explain. A portion of the twisting unit T2 corresponding to the twisting unit T1 has a dash (') added to its reference numeral.

Reference numeral t3 is a rotary shaft supported by a boss t5 attached to the vertical frame t1 via a bearing t4. t6 is a holding member in which a flat plate-shaped brim portion t7 and a cylindrical brim portion t8 are arranged at a predetermined interval, and the holding member t6 has the flat-plate brim portion t7 positioned on the tip end side of the rotating shaft t3. Is attached to the rotating shaft t3 by a suitable fixing means, and a predetermined gap is provided in the cylindrical flange portion t8.
A part of the boss t5 is arranged. In addition, the cylindrical flange t
An edge portion t9 is provided on the outer circumferential side of the opening located on the vertical frame t1 side of 8 in a circumferential direction.

Reference numeral t10 denotes a hollow roller as a running body, which has a barrel shape with an appropriately soft and elastic central portion formed of a soft elastic material such as rubber or soft resin, and is a hollow roller t10. One end t11
Is attached to the outer peripheral portion of the flat plate-shaped flange portion t7 of the holding member t6,
In addition, the other end t12 of the hollow roller t10 is
By inserting into the cylindrical collar portion t8 of the holding member t6,
The hollow roller t10 is configured to be fitted to the holding member t6. One end portion t12 of the hollow roller t10 fitted to the holding member t6 in this manner abuts on the edge portion t9 projecting from the cylindrical flange portion t8 of the holding member t6, and the hollow roller t10 forms the edge portion. It is configured so as not to move to the vertical frame t1 side beyond t9. Further, one end portion t11 of the hollow roller t10 fitted to the holding member t6 has an inner diameter of the end portion t11 of the hollow roller t10 attached to the end surface of the rotary shaft t3 by a suitable fastener such as a bolt t13. Flange t1 having a slightly larger outer diameter
4, so that the hollow roller t10 does not move beyond the flange t14 toward the end of the rotary shaft t3.

As described above, the hollow roller t inserted into the flat plate-shaped brim portion t7 and the cylindrical brim portion t8 of the holding member t6.
10, the end portions t11 and t12 are configured to abut on the flange t14 attached to the end surface of the rotation shaft t3 and the edge portion t9 protruding from the cylindrical flange portion t8, respectively. The movement of the rotating shaft t3 in the axial direction is blocked,
It can rotate in a stable state without shaking.

If the outside air temperature is lower than the air in the warm hollow roller t10 when the warm twisting unit T1 is stopped during operation, when the hollow roller t10 cools, the hollow roller t10 contracts or It may be deformed. In order to prevent such shrinkage or deformation of the hollow roller t10, an appropriate number of through holes t15 are provided in the cylindrical flange portion t8. The through hole t15 is a hollow roller t
Since it is provided on the cylindrical collar portion t8 instead of 10,
The through hole t15 does not contact the fiber assembly S.

Reference numeral t16 denotes a hollow roller t as a running body.
10 is a pulley attached to the end of the rotating shaft t3 on the side opposite to the side where it is arranged. By rotating the pulley t16 with a belt t17 connected to a drive source, the rotating shaft t3 is driven, The hollow roller t10 inserted into the holding member t6 is configured to rotate.

As shown in FIG. 1, the rotating shaft t3 of one twisting unit T1 of the twisting units T1 and T2 having the above-described structure and the other twisting unit T1.
The two rotation axes t3 ′ are arranged so as to intersect with each other, and the twisting units T1 and T2 are so arranged that the hollow rollers t10 and t10 ′ are in surface contact with each other in a large diameter region in a substantially central portion. The fiber aggregate S is gripped and twisted and untwisted in the contact area between the hollow rollers t10 and t10 ′ which are disposed and are in surface contact with each other. In addition, the hollow rollers t10 and t10 ′ are
The hollow rollers t10 and t10 ′ are configured in a barrel shape so as to have a convex curved surface in the contact area between the hollow rollers t10 and t10 ′, and at least in the nip area of the fiber assembly S, and the nip force is strongest in the central portion of the nip area, It becomes weaker toward the entrance and exit of the assembly S.

The hollow rollers t10 and t10 'completely nip the fiber assembly S and give false twist to the fiber assembly S. Since it is completely nipped, the hollow roller t
10, t10 ', the velocity of the component in the feed direction of the fiber assembly S, and the hollow rollers t10, t1 of the fiber assembly S.
The running speed in the 0'nip region substantially matches. In this way, the fiber assembly S is passed through the hollow roller t.
Since the contact area between the t and 10 'is completely gripped, the fiber assembly S can be provided with about the same number of twists as the twisting component of the rotation speed of the hollow rollers t10 and t10'. Hollow rollers t10, t1
Since the untwisting can be performed in almost the same number as the twisting component having the rotation speed of 0 ', the untwisting and untwisting work by the twisting member T can be effectively performed. Therefore, since the supply speed of the fiber assembly S and the take-up speed of the manufactured yarn Y can be increased, the manufacturing speed of the yarn Y can be increased.
Further, the fiber assembly S is replaced with the hollow rollers t10, t10 ′.
Since the fiber aggregate S is gripped by the contact area between the fiber aggregates S, the fiber aggregate S can be reliably sent out. Therefore, the fiber aggregate S is stabilized between the fiber supply roller 5 and the twisting member T. Since the tension can be maintained, stable twisting is possible, and the uniform yarn Y can be manufactured.

Further, the fiber assembly S is replaced with the hollow roller t1.
Since it is completely gripped by the contact area between 0 and t10 ′, the untwisting force of the same number as the twisting component of the rotation speed of the hollow rollers t10 and t10 ′ is applied to the hollow rollers t10 and t1.
It can be performed immediately after leaving the center of the contact area between 0's, that is, immediately after leaving the nip point. Therefore, as shown in FIG. 3B showing the number of twists per unit length of the core fiber of the fiber assembly S between the fiber supply roller 5 and the nip roller 7, the twisting member T twists The twist imparted to the core fiber of the fiber assembly S located between the member T and the fiber supply roller 5 is the hollow rollers t10, t10 ′.
Immediately after exiting the nip point of, and immediately before exiting the contact area, the yarn is instantly untwisted to almost zero.

As described above, the twist imparted to the core fiber of the fiber assembly S between the twisting member T and the fiber supply roller 5 is immediately after leaving the nip point of the hollow rollers t10 and t10 '. Moreover, since it is instantly untwisted to almost zero before it leaves the contact area, the wrapping fiber wound around the core fiber in the direction opposite to the twisting direction of the core fiber is instantly untwisted. Around the untwisted core fiber more strongly, and since the wound fiber is wound around the core fiber while being in contact with the hollow rollers t10 and t10 ′, the wound fiber may pop out. Therefore, the winding of the fiber around the core fiber is promoted, and the yarn Y having a small number of fluffs and a round cross section and a uniform shape (see FIG. 5A) is obtained.

The change of the sending speed component and the twisting component of the twisting member T is appropriately adjusted by the rotation speed of the hollow rollers t10, t10 'or the inclination angle of the hollow rollers t10, t10' with respect to the fiber assembly S. By maintaining the tension of the core fiber between the fiber supply roller 5 and the twisting member T, the core fiber is not loosened and the twisting member T effectively changes the core fiber. It can be twisted. To bring the core fiber into a tension state between the fiber supply roller 5 and the twisting member T, that is, to apply a predetermined tension to the core fiber,
Required to propagate to fiber feed roller 5 position. Therefore, as an example, the peripheral speed of the fiber supply roller 5 and the speed of the component in the feeding direction of the fiber assembly S in the hollow rollers t10, t10 ′ are made substantially the same, or Hollow roller t1
The speed at 0 and t10 'is slightly increased. However, this speed relationship is not an absolute condition, but is changed depending on the twisting direction, the type of fiber to be supplied, and the like.

The above-mentioned fiber supply roller 5 and twisting member T
Between the twisting member T and the nip roller 7, as in the case where the fiber assembly S is brought into a tensioned state.
By making the core fiber forming the yarn Y into a tension state,
A yarn Y having an internal torque and in an unstable state does not shrink and a yarn Y having a bad shape is not produced, and a yarn Y that is stable and has a good shape can be produced. it can. It is preferable that the speeds of the components of the hollow rollers t10 and t10 ′ in the feeding direction and the peripheral speed of the nip roller 7 are adjusted so that the yarn Y is not broken.

As described above, since the hollow roller t10 as the running body is formed of the soft elastic material and the barrel is bulged in the central portion, the pair of hollow rollers t10, t10 '. By contacting each other at the swelled central portion and adjusting the contact state by approaching / separating between the hollow rollers t10 and t10 ′.
The contact pressure and the like can be adjusted appropriately. The contact area between the hollow rollers t10 and t10 ′, the contact pressure, and the like are determined by the length of the fiber assembly S, the type of fibers constituting the fiber assembly S,
Considering the rotation speeds of the twisting units T1 and T2, etc., it is appropriately set so that the contact surfaces do not form a curved surface when the hollow rollers t10 and t10 ′ are brought into contact with each other. Also,
The softness or elasticity of the hollow rollers t10, t10 ′ formed of a soft elastic material is similar to the length of the fiber assembly S, the type of fibers forming the fiber assembly S, the rotation of the twisting units T1, T2. It is appropriately set in consideration of speed and the like.

Further, when the contact portion of the running body with the fiber assembly is formed into a convex curved surface, instantaneous untwisting can be effectively performed in the contact region between the running body and the fiber assembly. The convex curved surface may be formed on at least one traveling body of the pair of traveling bodies. For example, one traveling body has a roller shape and the other traveling body has an endless belt shape, and one traveling body The contact portion of the body with the fiber assembly may be formed into a convex curved surface, and the contact portion of the other traveling body with the fiber assembly may be formed into a flat surface.

The running body is not limited to the hollow roller, but may have another shape and structure.
The fiber aggregate to which the false twist is applied in the running body is not limited to the staple fiber aggregate, and may be the filament aggregate.

[0032]

Since the present invention is configured as described above, it has the following effects.

Since the twisting and untwisting operations can be effectively performed, the yarn production speed can be increased and stable twisting can be performed.

Since the twist imparted to the fiber assembly is untwisted to almost zero immediately after passing through the nip point between the traveling bodies and before passing through the contact area between the traveling bodies, the wound fiber is It is instantly untwisted and wraps around the untwisted core fiber more tightly.

Moreover, since the wound fiber is wound around the core fiber while coming into contact with the running body, it is possible to prevent the wound fiber from jumping out due to centrifugal force.
Wrapping around the core fiber promotes the winding of the fiber,
It is possible to manufacture a round yarn having a small cross-sectional shape with less fluff.

[Brief description of drawings]

FIG. 1 is a perspective view of a twisting device for a fiber assembly according to the present invention.

FIG. 2 is a vertical cross-sectional view taken along the axis of a twisting unit that constitutes the twisting device for a fiber assembly of the present invention.

FIG. 3 is a schematic explanatory view of a twisting method and twisting device for a fiber assembly according to the present invention.

FIG. 4 is a schematic explanatory view as an example of a conventional twisting method and twisting device for a fiber assembly.

FIG. 5 is a front view of a yarn manufactured by a twisting method of the present invention and a yarn manufactured by a conventional twisting method.

[Explanation of symbols]

 S ・ ・ ・ ・ Fiber aggregate T ・ ・ ・ ・ Twisting member Y ・ ・ ・ ・ Yarn t10 ・ ・ ・ Cavity roller (running body) 5 ・ ・ ・ ・ ・..Fiber supply roller 6 ... Air nozzle 7 ... Nip roller

Claims (3)

[Claims] 1. A fiber assembly is run, and the fiber assembly is passed between a pair of running bodies that cross each other to run, and the pair of running bodies twists and feeds the fiber assembly.
A twisting method of a fiber assembly, wherein the fiber assembly is sandwiched so that the speed of the component of the pair of running bodies in the fiber assembly feeding direction substantially coincides with the running speed of the fiber assembly at the nip point. 2. A fiber assembly that has passed through a front roller of a drafting device is introduced into a twisting device that applies twist by sandwiching the fiber assembly, and the twist generated by the twisting device is propagated to the front roller. In addition, the twisting is canceled within a contact range with the yarn in the twisting device. 3. A pair of running bodies that cross each other and run, wherein at least a contact portion of the pair of running bodies with a fiber aggregate is formed of an elastic member, and the pair of running bodies have a predetermined mutual shape. The twisting device is characterized in that the contact portion with the fiber assembly is elastically deformed by being pressed by the pressure of 1 and the contact portion of at least one of the running bodies with the fiber assembly is formed into a convex curved surface. .