JPH07173727A - Air-spinning device - Google Patents

Abstract

PURPOSE:To provide an air spinning device capable of producing a bound spun yarn high in the composing ratio of wound filaments and excellent in the strength of the yarn. CONSTITUTION:In the air spinning of a sliver, the sliver S is fed from a pair of the front rolls of a draft device in a flat press-spread state. The central filaments (fa) of the sliver S are collected by the false-twisting action imparted with the sucking and revolving flow of air into an auxiliary nozzle Na and simultaneously guided into the nozzle Na. Simultaneously, the tips of the filaments (fb) on both the sides of the sliver S are sucked into the outer peripheral filament bundle passage 3 of the auxiliary nozzle Na in a free state. When the tips reach a winding nozzle N1, the filaments (fb) are revolved in the direction opposite to the false-twisting direction and wound on the filaments (fa). In the subsequent process for untwisting the false-twisting of the core filament bundle comprising the collected filaments (fa) on the downstream side of a twisting nozzle N2, the wound filaments (fb) are further strongly wound to form a bound spun yarn Y.

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]

There are provided three types of air spinning nozzles, which are an auxiliary nozzle, a winding nozzle, and a twisting nozzle, which are arranged in series.

[0009]

In the fiber bundle sent from the draft device, a part of the fiber group is bundled by the false twist of the twisting nozzle, and the remaining fiber is separated. At this time, the twisting of the twisting nozzle is assisted by the auxiliary nozzle, and the twisting and converging point is stabilized and the amount of the wound fiber is stabilized because the twisting of the twisting nozzle is assisted and is transmitted to the nip point of the front roller of the draft device.

[0010]

Embodiments will be described with reference to the drawings.

Referring to FIG. 1, an air spinning device 1 according to an embodiment of the present invention has three types of auxiliary nozzles Na, a winding nozzle N1, and a twisting nozzle N2 arranged in series on the downstream side of a front roller pair 2 of a draft device. An air spinning nozzle, a fiber bundle passage 3 provided on the introduction side of the winding nozzle N1 in parallel with the auxiliary nozzle Na, and a tip portion 41 located inside the winding nozzle N1. It is mainly configured by the introduction tube 4 which penetrates the yarn guiding hole 42 reaching the twisting nozzle N2 in the center.

The winding nozzle N1 is formed inside a stepped cylindrical nozzle block 5, and the nozzle block 5 is
While the bush 6 is fitted on the large-diameter base end side, the bush 6 is fitted on the housing 7, the nozzle cap 8 is fitted on the small-diameter tip end side, and further, the nozzle cap 8 is supported by the cover 9. The cover 9 is fixed to the housing 7 by being screwed onto the tip of the housing 7.

On the inner side surface of the winding nozzle N1, an air injection passage 10 formed between the nozzle block 5 and the nozzle cap 8 is passed through 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 directed toward the inner side surface tangential direction of the winding nozzle N1.
The winding nozzle N1 is obliquely provided toward the downstream side in the yarn traveling direction with an appropriate inclination angle with respect to the central axis of the winding nozzle N1, and is further directed to the tip portion 41 of the yarn guiding 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, compressed air is supplied from the air supply pipe to the air supply passage 10 through the air supply hole 11 so that the compressed air can be injected into the winding nozzle N1 from the compressed air injection hole n1.

The auxiliary nozzle Na is located on the introduction side of the winding nozzle N1 as shown in FIG. 4, and the cylindrical portion 51 is provided coaxially in the nozzle block 5 with its axis aligned with the winding nozzle N1. Is provided through the center of the outlet 52
Is projected into the winding nozzle N1 and the tip portion 41 of the yarn guiding tube 4 is
Is facing.

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

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. By supplying compressed air to the air supply passage 13 through the air supply hole 14, compressed air can be injected from the compressed air injection hole na into the auxiliary nozzle Na.

The fiber bundle passage 3 is formed in parallel with the auxiliary nozzle Na between the outer surface of the upper half of the cylindrical portion 51 and the inner surface of the upper half connected to the inner surface of the winding nozzle N1. Further, it is a hollow portion having a sectoral shape (arc shape) in cross section, the lower half is solid, and the cylindrical portion 51 and the nozzle block 5 are integrally formed.

Further, the winding nozzle N1 inside the nozzle block 5 is widened conically from the winding 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 twisting nozzle N2 is provided inside a stepped cylindrical nozzle block 16 which is integrally formed with the cylindrical yarn guide 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 positioned inside the winding nozzle N1.

Further, on the inner side surface of the twisting nozzle N2, a compressed air injection hole n2 is opened from an air supply passage 21 formed between the nozzle block 16 and the housing 7 through the side wall of the nozzle block 16. ing. The compressed air injection hole n2 is
The twisting nozzle N2 is provided obliquely toward the inner side surface tangential direction toward the downstream side in the yarn traveling direction with an appropriate inclination angle with respect to the central axis of the twisting nozzle N2. 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 passage 21 through 22 and to inject compressed air into the twisting nozzle N2 from 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.
A central axis C common to the auxiliary nozzle Na, the winding nozzle N1, the yarn introducing hole 42, and the twisting nozzle N2.
Is offset slightly downward with respect to the nip line K of the front roller pair 2. 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 auxiliary nozzle Na, a suction swirling airflow is generated from the introduction port 5a through the outlet 52 to the inside of the winding 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 twisting nozzle N2 described later, but the swirling airflow of the twisting nozzle N2 and the swirling airflow of the winding nozzle N1 described below is compressed air. The injection pressure is set relatively low.

Further, in the winding nozzle N1, the swirling airflow in the auxiliary nozzle Na and the swirling airflow in the twisting nozzle N2 are opposite to each other by arrows in FIG. A swirling airflow as shown by A1 is generated, and while circulating around the yarn guiding tube 4, the swirling airflow reaches the exhaust passage 15 through the delivery port 53, diffuses, and is exhausted. Accordingly, in the fiber bundle passage 3 located on the introduction side of the winding nozzle N1, the winding nozzle N1 is introduced from the introduction port 5b.
A suction airflow reaching the inside is generated, but the suction airflow is a parallel airflow containing almost no swirl component due to the influence of the position of the fiber bundle passage 3 and the cross-sectional shape.

In the twisting nozzle N2, a swirling airflow as shown by an arrow A2 in FIG. 3, which is opposite to the swirling airflow in the winding 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 1
9. The air is exhausted from the delivery port 23 through the hollow bolts 20, and accordingly, in the yarn guide tube 4, a suction airflow is generated from the tip portion 41 through the yarn guide hole 42 into the twisting nozzle N2.

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 flatly spread by the front roller pair 2, a part of the central portion of the fibers forming the sliver S is sent. The fiber fa is introduced into the auxiliary nozzle Na while being converged by false twist provided by the suction swirling airflow generated in the auxiliary nozzle Na.

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 is sent out in a free state like fb, and most of it is fed into the fiber bundle passage 3 provided in parallel along the upper half of the outer periphery of the auxiliary nozzle Na, and the winding nozzle. It is sucked by the suction airflow that does not include the swirl generated by the compressed air injection in N1,
It is introduced in a substantially parallel state.

At this time, the center axis C (see FIG. 1) 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 located at the front. Since the roller pair 2 is positioned on the extension of the sliver S in the delivery direction, the fibers fb in the free state are relatively easily introduced into the fiber bundle passage 3.

The fibers fb in the free state are fed into the winding nozzle N1 through the fiber bundle passage 3 and are then converged in the winding nozzle N1 through the auxiliary nozzle Na in the winding nozzle N1. It is wound around the fiber bundle fa continuously drawn out in the closed state as follows.

That is, when the fiber fb in the free state reaches the winding nozzle N1, the fiber fb is wound around the winding nozzle N1.
By the swirling airflow inside the fiber bundle fa, the fiber bundle is swirled in the direction opposite to the false twist, but the fiber tip of the fiber fb is introduced into the yarn guiding tube 4 generated by the compressed air injection in the twisting nozzle N2. It is sucked by the suction airflow and introduced into the yarn introducing hole 42 while being wound around the fiber bundle fa in the false twist state.

On the other hand, the fiber rear end of the fiber fb is a jet of compressed air in the winding nozzle N1, and a swirling air current is generated around the yarn guiding tube 4 while traveling around the yarn guiding tube 4 toward the delivery port 53. By the action, it is separated from the fiber bundle fa,
Once it is spirally wound around the tip portion 41 of the yarn guiding tube 4 as indicated by fb 'in FIG. 3 along the swirling direction of the air flow.

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, the twisting nozzle N2 is passed through the yarn introducing hole 42.
In the process of untwisting the false twist of the core fiber bundle fa on the downstream side of
The wound fiber fb is further strongly wound around the core fiber bundle fa, 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 having almost no twist. 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 twisting nozzle N2 is applied to the winding nozzle N1 and the auxiliary nozzle Na. After that, the fiber bundle fa is retroactively transmitted to the vicinity of the nip line K of the front roller pair 2, and the fiber bundle fa is converged by the false twist of the twisting nozzle N2, and the auxiliary nozzle Na assists the transmission of the false twist. .

That is, when the false twist of the twisting nozzle N2 is transmitted to the front roller pair 2 over the swirling airflow of the winding nozzle N1 in the direction opposite to the direction of the false twist, the false twist is momentarily introduced in the fiber bundle. A situation in which a change in the focusing point is caused due to a large change in mass or the like is prevented by the twist provided by the swirling airflow in the same direction as the false twist by the auxiliary nozzle Na located near the front roller pair 2.

Further, the fiber bundle passage 3 feeds the free fiber fb, which is a wound fiber, into the winding nozzle N1 independently of the fiber bundle fa, so that the twisting nozzle for the free fiber fb is twisted. 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 free fiber fb is provided by the fiber bundle passage 3 provided in parallel with the auxiliary nozzle Na.
Although an example of feeding the fiber into the winding nozzle N1 has been shown, the introduction route of the free fiber fb is not limited to this.

[0039]

The pneumatic spinning device of the present invention, as described above,
Since three types of air spinning nozzles, which are an auxiliary nozzle, a winding nozzle, and a twisting nozzle arranged in series, are provided, the false twisting of the twisting nozzle is reliably transmitted retroactively by the auxiliary nozzle, and the core fiber bundle by the false twisting is provided. It is possible to manufacture a spun yarn not only capable of stabilizing the focusing point and reducing the yarn breakage but also having a high constituent ratio of the wrapping fiber 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 3 Fiber bundle passage 4 Yarn guide tube 5,16 Nozzle block Na Auxiliary nozzle N1 Winding nozzle N2 Twisting nozzle na, n1, n2 Pneumatic injection hole S Sliver Y Spun yarn fa Fiber bundle (core) Fiber bundle) fb free fiber (wrapping fiber)

Claims (1)

[Claims] 1. An air spinning device comprising three types of air spinning nozzles, which are an auxiliary nozzle, a winding nozzle, and a twisting nozzle, which are arranged in series.