JPH07173728A - Air-spinning device - Google Patents

Abstract

PURPOSE:To provide an air-spinning device capable of stabilizing a filament- collecting point for a filament bundle by the false-twisting action of an air- spinning nozzle, reducing the breakage of the filaments, and producing a spun yarn high in the composing ratio of the wound filaments and excellent in the strength. CONSTITUTION:An air spinning device is provided with a winding nozzle N1 disposed on the downstream side of a draft device and capable of generating a revolving air flow and with a false-twisting nozzle N2 disposed on the downstream side of the winding nozzle, two filament bundle passages 3a, 3b being disposed between the winding nozzle and the draft device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic spinning device.

[0002]

2. Description of the Related Art Conventionally, in an air spinning device, a sliver supplied from a can is drafted by a draft device composed of three or more draft roller pairs, and then the sliver is arranged in series downstream of the draft device. The false spinning is performed by an air spinning nozzle including a first nozzle (defibration winding nozzle) and a second nozzle (twisting nozzle) that generate swirling airflows in opposite directions.

That is, when the sliver drafted by the drafting device and spread flatly is fed from the front roller, the sliver goes up to the vicinity of the front roller.
It is bundled by false twisting of the nozzle, but by the ballooning by the first nozzle in the direction opposite to the false twisting, the rear end is gripped by the front roller and is in the fiber bundle constituting the sliver, but the tip is free. Unrestrained fibers are produced.

[0004] The fibers with the tip unconstrained are wound around the core fiber bundle in the direction opposite to the false twisting as a core fiber bundle by the action of the swirling air current in the first nozzle. In the process of untwisting the false twist through the second nozzle, the false twist is further tightly wound around the core fiber bundle, and as a result, the wound fiber is present around the parallel core fiber bundle that is almost untwisted. A bundled spun yarn in a twisted state is formed.

However, in the spinning process, when the fiber bundle forming the sliver undergoes a momentary mass change due to irregularities in draft, ballooning in the first nozzle collapses, and the false twisting of the second nozzle proceeds to the upstream side. When the sliver's focusing point becomes unstable and vibrates or moves downstream, the twisted state of the spun yarn changes and yarn breakage occurs due to insufficient twist. occured. In particular, a cotton raw material containing a lot of dust and clogging tends to increase the yarn breakage during spinning.

In order to increase the yarn strength of the bound spun yarn, it is essential to increase the amount of the wrapping fiber and keep the wrapping fiber at a constant level. Since the uncertain factors such as the ballooning of the fiber bundle due to the swirling airflow of the first nozzle and the influence of the accompanying airflow due to the rotation of the front roller are involved in the generation, the amount of the wound fiber is intentionally controlled. Was difficult. In particular, when spinning cotton with an asymmetric fiber length, the wound fiber appears intermittently, and it is difficult to secure the yarn uniformity and yarn strength.

[0007]

In view of the above-mentioned problems of the prior art, the present invention makes it possible to stabilize the focusing point of the fiber bundle by false twisting of the air spinning nozzle and reduce the yarn breakage. It is an object of the present invention to provide a pneumatic spinning device capable of producing spun yarn having a high constituent ratio of wound fibers and excellent yarn strength.

[0008]

[Means for Solving the Problems] A winding nozzle disposed downstream of a draft device and capable of generating a swirling airflow therein, and a false twist nozzle provided downstream of the winding nozzle are provided.
Two fiber bundle passages were provided between the winding nozzle and the draft device.

[0009]

The part of the fiber bundle drafted by the drafting device and delivered is collected by the false twisting of the false twisting nozzle which is transferred upstream through the one fiber bundle passage and introduced into the one fiber bundle passage. However, the remaining fibers are separated from the part of the fiber bundle and introduced into the other fiber bundle passage. Then, in the winding nozzle, the fiber bundle passing through the one fiber bundle passage is wrapped with the fiber passing through the other fiber bundle passage.
Form a spun yarn of a book.

[0010]

Embodiments will be described with reference to the drawings.

In FIG. 1, an air spinning device 1 according to an embodiment of the present invention comprises an air spinning nozzle composed of a first nozzle N1 and a second nozzle N2 arranged in series on the downstream side of a front roller pair 2 of a draft device. Two fiber bundle passages 3a and 3b provided on the introduction side of one nozzle N1, and the first nozzle N
The leading end portion 41 is located inside 1 and is mainly configured by the introduction tube 4 which penetrates the yarn guiding hole 42 extending from the leading end portion 41 to the second nozzle N2 in the center.

The first nozzle N1 is formed inside the stepped cylindrical nozzle block 5, and the nozzle block 5 is fitted into the housing 7 with the bush 6 fitted on the large-diameter base end side. The nozzle cap 8 is fixed to the housing 7 by fitting the nozzle cap 8 onto the tip end side of the small diameter and screwing the cover 9 onto the tip end of the housing 7 while the nozzle cap 8 is supported by the cover 9. .

Further, on the inner surface of the first nozzle N1, an annular air supply passage 10 formed between the nozzle block 5 and the nozzle cap 8 penetrates the side wall of the nozzle block 5 to form a compressed air injection hole n1. Is open. The compressed air injection hole n1 is provided obliquely toward the downstream side in the yarn traveling direction with an appropriate inclination angle with respect to the central axis of the first nozzle N1 in the tangential direction of the inner surface of the first nozzle N1. And is directed to the tip 41 of the yarn guide tube 4. Further, the air supply passage 10 is communicated with an air supply hole 11 which extends vertically through the upper part of the housing 7, and an air supply pipe (not shown) is connected to an introduction portion 12 of the air supply hole 11. Then, from the air supply pipe, through the air supply hole 11, the air supply path 10
It is possible to inject compressed air into the first nozzle N1 through the compressed air injection hole n1.

As shown in FIG. 4, the fiber bundle passages 3a and 3b are located on the introduction side of the first nozzle N1, and one fiber bundle passage 3a has the same axial center as that of the first nozzle N1 in the nozzle block 5. Is provided so as to penetrate through the center of a cylindrical portion 51 provided coaxially with the outlet portion 52, and its outlet 52 projects into the first nozzle N1 and faces the tip portion 41 of the yarn guiding tube 4. In addition, the exit 5
The circumference of 2 may have a tapered conical shape.

The other fiber bundle passage 3b is parallel to the fiber bundle passage 3a, and is parallel to the fiber bundle passage 3a, and is connected to the outer surface of the upper half of the cylindrical portion 51 and the inner surface of the first nozzle N1. Is a hollow portion having a fan-shaped (arc-shaped) cross section, and the lower half is solid, and the cylindrical portion 51 and the nozzle block 5 are integrally formed.

A compressed air injection hole na is opened on the inner surface of the fiber bundle passage 3a. The compressed air injection hole na penetrates through the nozzle block 5 from an annular air supply passage 13 formed between the nozzle block 5 and the nozzle cap 8 toward the inner surface tangential direction of the fiber bundle passage 3a, The bundle path 3a is provided obliquely toward the downstream side in the yarn traveling direction with an appropriate inclination angle with respect to the central axis.

Further, an air supply hole 14 is communicated with the air supply passage 13 through the nozzle cap 8, and an air supply pipe (not shown) is connected to the air supply hole 14, and the air supply pipe is connected to the air supply pipe 14. As a result, compressed air can be supplied to the air supply passage 13 through the air supply hole 14 and injected into the fiber bundle passage 3a from the compressed air injection hole na.

Further, the first nozzle N1 inside the nozzle block 5 is widened conically from the first nozzle N1 to the delivery port 53, and the delivery port 53 is communicated with the exhaust passage 15 formed by cutting the housing 7 from below. .

The second nozzle N2 is provided inside a stepped cylindrical nozzle block 16 which is integrally formed with the cylindrical yarn guiding tube 4 having a tapered conical shape at its tip portion 41 so as to have the same axial center. It is formed and communicates with the yarn guide hole 42. Then, the nozzle block 16 is fitted into the housing 7 with the flange 17 and the bush 18 fitted onto the yarn guiding tube 4, and then the hollow bolt 20 is screwed into the housing 7 via the nozzle guide 19 to thereby It is fixed in the housing 7, and in the fixed state, the tip end side of the yarn guiding tube 4 penetrates the exhaust passage 15 and is located inside the first nozzle N1.

On the inner surface of the second nozzle N2, an air supply passage 21 formed between the nozzle block 16 and the housing 7 is provided with a compressed air injection hole n2 penetrating the side wall of the nozzle block 16. ing. The compressed air injection hole n2 is
The second nozzle N2 is provided obliquely toward the inner side surface tangential direction, with an appropriate inclination angle with respect to the central axis of the second nozzle N2, and toward the downstream side in the yarn traveling direction. Further, an air supply hole 22 is communicated with the air supply passage 21 through the housing 7, and an air supply pipe (not shown) is connected to the air supply hole 22. It is possible to supply compressed air to the air supply path 21 through 22 and inject compressed air into the second nozzle N2 through the compressed air injection hole n2.

The pneumatic spinning device 1 has a central axis line of the pneumatic spinning device 1, that is, as shown in FIG.
The central axis C common to the fiber bundle passage 3a, which passes through the first nozzle N1 and the yarn introducing hole 42 and reaches the second nozzle N2, is offset slightly downward with respect to the nip line K of the front roller pair 2. Is provided. In addition, 2 in FIG.
4, 25, 26, 27 and 28 are sealing members such as O-rings.

Next, the operation will be described based on the embodiments.

The pneumatic spinning device 1 constructed as described above is
The following air flows are generated in each part. That is, in the fiber bundle passage 3a, a suction swirling airflow is generated from the introduction port 5a through the outlet 52 to the inside of the first nozzle N1 by the compressed air injection from the compressed air injection hole na. The swirling direction of the airflow is the same as the swirling airflow direction in the second nozzle N2 described later, but the swirling airflow of the second nozzle N2 and the swirling airflow of the first nozzle N1 described below is compressed air. The injection pressure is set relatively low. It should be noted that the above-mentioned compressed air injection must be always performed when the sliver S is introduced, but it may be stopped later.

In the first nozzle N1, the swirling airflow in the fiber bundle passage 3a and the swirling airflow in the second nozzle N2 are opposite to each other by the compressed air injection from the compressed air injection hole n1 as shown in FIG. A swirling airflow is generated as shown by arrow A1,
The swirling airflow goes around the yarn guiding tube 4 while being sent around the delivery port 53.
To reach the exhaust passage 15, and diffuse and exhaust. Along with this, in the fiber bundle passage 3b located on the introduction side of the first nozzle N1, a suction airflow from the introduction port 5b to the inside of the first nozzle N1 is generated, and the suction airflow is at the position of the fiber bundle passage 3b. Due to the influence of the cross-sectional shape, the airflow is parallel and contains almost no swirl component.

Then, in the second nozzle N2, swirling airflow as shown by an arrow A2 in FIG. 3, which is opposite to the swirling airflow in the first nozzle N1, is generated by the pressurized air injection from the pressurized air injection hole n2. The swirling airflow is generated by the nozzle guide 19,
The air is exhausted from the delivery port 23 through the hollow bolt 20, and accordingly, in the yarn guide tube 4, a suction airflow is generated from the tip portion 41 to the second nozzle N2 through the yarn guide hole 42.

Next, a spinning process by the air spinning device 1 which produces an air flow in each section as described above will be described with reference to FIGS. 2 and 3.

When the sliver (fiber bundle) S drafted by the draft device is fed while being spread flatly by the front roller pair 2, a part of the central portion of the fibers forming the sliver S is sent out. The fiber fa is introduced into the fiber bundle passage 3a while being converged by false twist provided by the suction swirling airflow generated in the fiber bundle passage 3a.

However, most of the remaining fibers, in particular, the fiber tips on both sides of the sliver S widened by the entrained airflow of the front roller pair 2 are not focused by the above false twist, but the above-mentioned part of the focused fibers. It is separated from the fiber bundle fa and sent out in a free state like fb, and most of it is fed into the other fiber bundle passage 3b provided in parallel along the upper half of the outer periphery of the fiber bundle passage 3a. It is sucked by the suction airflow that does not include the swirl generated by the compressed air injection in the first nozzle N1, and is introduced in a substantially parallel state.

At this time, the center axis C of the pneumatic spinning device 1 is provided so as to be positioned below the nip line K of the front roller pair 2, and the fiber bundle passage 3b is provided.
Is located on the extension of the front roller pair 2 in the delivery direction of the sliver S, so that the free state of the fiber fb is relatively easily introduced into the fiber bundle passage 3b.

The fibers fb in the free state are fed into the first nozzle N1 via the fiber bundle passage 3b, and in the first nozzle N1 via the fiber bundle passage 3a to the first nozzle N1.
Fiber bundles f that are continuously drawn out in a state of being bundled in 1
It is wound around a as follows.

That is, when the fiber fb in the free state reaches the first nozzle N1, the fiber fb is swirled in the direction opposite to the false twist of the fiber bundle fa by the swirling air flow in the first nozzle N1. The fiber tip of the fiber fb has a second nozzle N2.
It is sucked by the suction airflow into the yarn guiding tube 4 generated by the compressed air jet inside, and is introduced into the yarn guiding hole 42 while being wound in the fiber bundle fa in the false twist state.

On the other hand, the fiber rear end of the fiber fb generates a compressed air jet in the first nozzle N1 and a swirling air current flowing toward the delivery port 53 while circling around the yarn guide tube 4 generated thereby. By the action, it is separated from the fiber bundle fa, and is once spirally wound along the swirling direction of the air flow around the tip end portion 41 of the yarn guiding tube 4 as indicated by fb 'in FIG.

Next, the fiber rear end fb 'wound around the yarn guide tube 4 is drawn into the yarn guide tube 4 as the fiber bundle fa advances, and the fiber bundle fa is used as a core fiber bundle. Winding is performed around the core fiber bundle fa in the direction opposite to the false twist to form a wound fiber fb.

Then, through the yarn introducing hole 42, the second nozzle N2
In the process of untwisting the false twist of the core fiber bundle fa on the downstream side of
The wound fiber fb can be wound around the core fiber bundle fa more strongly, and as a result, the bundled spun yarn Y is twisted due to the existence of the wound fiber fb around the parallel core fiber bundle fa which is almost untwisted.
Is obtained.

After the spun yarn Y is delivered to the downstream side through the above spinning process, the false twist added to the core fiber bundle fa by the second nozzle N2 is the first nozzle N1 and the fiber bundle passage 3a. After that, the fiber bundle fa is bundled by being retroactively transmitted to the vicinity of the nip line K of the front roller pair 2 and false twisted by the second nozzle N2. Therefore, after the spun yarn Y is delivered to the downstream side, the fiber bundle passage 3
The compressed air injection in a may be stopped.

The portion of the fiber bundle fa on which the swirling air current of the first nozzle N1, which is in the direction opposite to the false twist direction of the second nozzle N2, acts on the fiber bundle fa and the tip portion 41 of the yarn guiding tube 4 and the fiber bundle passage 3a.
Of the fiber bundle fa is guided by the fiber bundle passage 3a within the fiber bundle passage 3a, and its ballooning is suppressed. Therefore, even if an instantaneous mass change occurs in the fiber bundle fa, the situation in which false twist transmission is hindered by collapse of ballooning does not occur. Therefore, the focusing point of the fiber bundle fa is always stable, and the occurrence of yarn breakage due to insufficient twist is prevented.

Further, by the fiber bundle passage 3b, the free fiber fb to be a wound fiber is fed into the first nozzle N1 independently of the fiber bundle fa, so that the second nozzle to the free fiber fb is supplied. Since the influence of false twisting of N2 is eliminated, not only is a large amount of wound fiber fb generated and secured, but
The amount of the wound fiber fb is kept constant, and the wound fiber fb is guided by the tip portion 41 of the yarn guiding tube 4 and the core fiber bundle fa.
Since it is wound around the yarn, the yarn is evenly distributed over the entire yarn at a substantially constant winding angle, whereby the spun yarn Y is greatly improved in uniformity and yarn strength.

In the above embodiment, the two fiber bundle passages 3a and 3b are connected to the first nozzle N1 and the first nozzle N1.
An example provided on the introduction side of the device including the yarn guide tube 4 having the tip end portion 41 opened therein and the second nozzle integrated with the yarn guide tube 4 is shown, but the present invention is not limited to this. However, the present invention can be applied to air spinning nozzles having other shapes and arrangements.

Further, when the distance between the nip point K of the front roller 2 and the compressed air jet hole n1 is longer than the maximum fiber length, all the fibers have already been swung by the swirling airflow. Since the rear end is out of the nip of the front roller 2 and the fibers cannot be bundled, it is preferable to set the position of the compressed air injection hole n1 so that the distance is shorter than the maximum fiber length.

[0040]

The pneumatic spinning device of the present invention, as described above,
A winding nozzle that is arranged on the downstream side of the draft device and that can generate a swirling airflow inside, and a false twist nozzle provided on the downstream side of the winding nozzle are provided, and between the winding nozzle and the draft device, Since the two fiber bundle passages are provided, it is possible to manufacture a spun yarn having a high constituent ratio of wound fibers and excellent yarn strength.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an air spinning device according to an embodiment of the present invention.

FIG. 2 is a side sectional view of a main part showing a spinning process by the pneumatic spinning device according to the embodiment of the present invention.

FIG. 3 is a main part perspective view showing a spinning process by the pneumatic spinning device of the embodiment of the present invention.

FIG. 4 is a perspective view of a main part of the pneumatic spinning device according to the embodiment of the present invention.

[Explanation of symbols]

 1 Pneumatic spinning device 2 Front roller pair 3a, 3b Fiber bundle passage 4 Yarn guide tube 5,16 Nozzle block N1 First nozzle N2 Second nozzle n1, n2, na Compressed air injection hole S Sliver Y Spun yarn fa Fiber bundle (core fiber) Bundle) fb free fiber (wrapping fiber)

Claims (1)

[Claims] 1. A winding nozzle, which is disposed on the downstream side of the draft device and is capable of generating a swirling airflow inside, and a false twist nozzle provided on the downstream side of the winding nozzle. An air spinning device characterized in that two fiber bundle passages are provided between them.