JPH06330414A - Pneumatic spinning apparatus - Google Patents

Abstract

PURPOSE:To provide a pneumatic spinning apparatus capable of preventing the production of loss fiber in the 1st nozzle and the consequent thin yarn defect and the yarn breakage caused by the fluctuation of the sliver collection point and giving a yarn having stable quality. CONSTITUTION:A nip roller 13 is placed between a 1st nozzle 11 and a 2nd nozzle 12 arranged in series immediately after the front roller 24 of a drafting apparatus. The distance L between the nip roller and the front roller is made to be shorter than the average fiber length.

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 a pneumatic spinning device, a sliver supplied from a can is drafted by a draft device composed of three or more draft roller pairs and then arranged in series downstream of the draft device. First nozzle and second
False twist spinning is performed with an air spinning nozzle composed of a nozzle and a nozzle.
Hereinafter, an example thereof will be described with reference to FIG.

In FIG. 3, swirling airflows a and b in mutually opposite directions due to compressed air injection are generated inside the first nozzle 31 and the second nozzle 32 which constitute the air spinning nozzle 30, and At the introduction portion of the nozzles 31 and 32, a suction airflow is generated along with the compressed air jet.

Then, the sliver S drafted by the drafting device and flattened and expanded is a front roller.
When it is delivered from the roller 33, it is converged by false twisting by the second nozzle 32, which is transmitted retroactively to the vicinity of the front roller 33, but the front roller 33 and the first nozzle 3
1 and the sliver S is ballooned by the first nozzle in the direction opposite to the false twist, and the rear end is gripped by the front roller 33 by this ballooning, and the fiber bundle constituting the sliver S is bundled. Although it is inside, a fiber f0 that is released and is in an unrestrained state is generated at the tip.

The unrestricted fiber f0 is moved by the suction swirling airflow a of the first nozzle 31 into the second nozzle 3 as shown by f1.
The core fiber bundle f2 is wound in the direction opposite to the false twist of 2.
The wound fiber f1 is further strongly wound around the core fiber bundle f2 in the process of passing the second nozzle 32 and untwisting the false twist, and as a result, about 15 to 20 of the entire core fiber bundle f2 is wound around the parallel core fiber bundle f2.
% Of the wound fiber f1 is present, the bundled spun yarn Y in a twisted state is formed.

However, in the above spinning process, the fibers f0 whose tips are unconstrained due to the vibration associated with the ballooning between the front roller 33 and the first nozzle 31 are sufficiently contained in the core fiber bundle f2. When the rear end of the fiber f0 is released from the grip of the front roller 33 without being wound around the fiber f0, the fiber f0 falls off and becomes a loss fiber f3. The loss fiber f3 is constantly present to some extent and is collected as dust in the dust collector 34 or the like. However, if the amount of the loss fiber f3 increases, the spun yarn Y may have a fine yarn defect. It was.

The sliver S is converged by the false twist of the second nozzle 32 in the vicinity of the front roller 33. However, when the fiber bundle constituting the sliver S undergoes a momentary mass change due to draft unevenness, There is also a problem that the ballooning in the nozzle 31 is broken, the transmission of the false twist of the second nozzle 32 to the upstream side is hindered, the focusing point of the sliver S becomes unstable, and yarn breakage occurs.

[0008]

SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, the present invention prevents the generation of loss fiber in the first nozzle and the accompanying failure of fine yarn, and the sliver focusing point. An object of the present invention is to provide a pneumatic spinning device capable of preventing yarn breakage due to fluctuations and having stable yarn quality.

[0009]

A nip roller is provided between a first nozzle and a second nozzle arranged in series immediately after a front roller of a draft device, and a distance between the nip roller and the front roller is shorter than an average fiber length. did.

[0010]

When the sliver delivered from the front roller of the draft device reaches the nipple roller through the first nozzle, most of the fibers forming the sliver are held by the front roller and the nip roller at both ends. During this period, no slack occurs, and the parallel state is still maintained without ballooning. In addition, the focusing point by false twist of the second nozzle is located on the downstream side of the first nozzle and immediately before the second nozzle. It is located and the false twist transmission path is extremely short.

The fibers of the surface layer of the sliver are the first
By the action of the swirling airflow of the nozzle, the fibers in the parallel state are wound around the core fiber bundle to form a wound fiber. The fiber bundle composed of the core fiber and the wrapping fiber is bundled by false twist in the direction opposite to the winding direction of the wrapping fiber by the swirling airflow of the second nozzle, and further untwisted on the downstream side of the second nozzle. As a result, a bundled spun yarn in which a wound fiber exists around a parallel core fiber bundle and is in a twisted state is obtained.

In the above spinning process, since the sliver maintains a parallel state without ballooning between the front roller and the nip roller, the fibers in the surface layer portion are liable to be broken due to the ballooning and the accompanying vibration. There will be no situation of leaving and becoming a loss fiber. Further, even if the front roller is ungripped while the winding of the wound fiber due to the swirling airflow of the first nozzle is released, the front end side of the wound fiber is already gripped by the nip roller, so Generation of loss fiber due to detachment is prevented. Furthermore, the false twist transmission path by the second nozzle is extremely short, and even when the fiber bundle undergoes an instantaneous mass change, movement of the focusing point and accompanying yarn breakage of the spun yarn are prevented.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the embodiment will be described with reference to the drawings.

In FIG. 1, a pneumatic spinning device 1 according to an embodiment of the present invention comprises a back roller pair 21, a saddle roller pair 22, a middle roller pair 23 mounted with an apron belt e, and a front roller pair 24. Is provided on the downstream side of the four-wire type draft device 2 including the first nozzle 11 provided immediately after the front roller pair 24, and the first nozzle 11 is connected in series on the downstream side of the first nozzle 11 with its axis aligned. A second nozzle 12 arranged and a nip roller 13 provided between them are provided, and a delivery roller 3 is provided downstream of the second nozzle 12.

The first nozzle 11 opens the introduction port 4 near the nip point of the front roller pair 24, and the first nozzle 1
Inside the nozzle 1, a compressed air injection hole 5 is provided in the tangential direction of the inner peripheral surface of the nozzle 11. Since the compressed air injection holes 5 are provided obliquely with respect to the yarn traveling direction, by injecting compressed air from the compressed air injection holes 5, the delivery port 6 from the introduction port 4 is introduced into the first nozzle 11. To generate a swirling suction airflow (Fig. 2a). Further, the first nozzle 11 has an extremely short overall length so as to be accommodated between a nip roller 13 and a front roller 24 which are provided close to each other for a reason described later.

The nipple roller 13 is provided close to the outlet 6 of the first nozzle 11, and the distance L between the nip points between the nipple roller 13 and the front roller 24 is larger than the average fiber length of the spun fiber. It should be provided so as to be short. The peripheral speed of the nip roller 13 is set to be the same as the peripheral speed of the front roller 24.

The second nozzle 12 connects the inlet 7 with a nipple.
Opening near the nip point of the roller 13
Inside the nozzle inner peripheral surface along the tangential direction, the above-mentioned first
The compressed air injection hole 8 is provided in the opposite direction to the nozzle 11. By injecting compressed air from the compressed air ejection port 8, a swirling airflow (FIG. 2b) in the direction opposite to that of the first nozzle 11 is generated in the second nozzle 12. In addition, the peripheral speed of the Deli Berry Roller 3 is
It is set slightly slower than the peripheral speed of the nipple roller 13.

Next, the operation will be described based on the above-mentioned embodiment.

When the sliver S drafted by the draft device 2 and flattened and spread is delivered from the front roller 24, the first nozzle 11 is fed from the introduction port 4 opened immediately after the front roller 24. The gas is introduced into the nozzle 11 by the swirling suction air flow a, and is sent to the nip roller 13 from the outlet 6. At this time, the distance L between the nip points between the front roller 24 and the nip roller 13 is determined by the sliver S
Since it is shorter than the average fiber length of the fibers that compose the fiber, the rollers between the front roller 24 and the nipple roller 13 are
There are always fibers whose ends are gripped by the laps 24, 13. Furthermore, the front roller 24 and the nipple
Since the la 13 has a constant circumferential speed, during this period, the core fiber bundle f2 centering on the above-mentioned both-end-holding state of the fiber forming the sliver S is not loosened and is not drafted. Therefore, even if the swirling airflow a of the first nozzle 11 is received, it is not ballooned, and the false twist does not occur, and the parallel state is maintained.

However, among the fibers forming the sliver S sent from the front roller 24, the rear end is still held by the front roller 24, but the tip has not yet reached the nip point of the nip roller 13. Fibers f0 of the surface layer portion (particularly both side portions of the sliver S spread and spread flat)
Is wound around the core fiber bundle f2 in the parallel state by the swirling airflow a of the first nozzle 11 to form a wound fiber f1.

Then, the fiber bundle Y0 composed of the core fiber bundle f2 and the wound fiber f1 in the parallel state is a nipple roller 13.
Immediately after, the swirling air flow b of the second nozzle 12 converges the falsely wound fiber f1 by false twisting in a direction opposite to the winding direction,
Further, when the yarn is passed through the second nozzle 12 and untwisted, the bundled spun yarn Y in a twisted state is formed due to the presence of the wound fiber f1 around the parallel core fiber bundle f2.

In the above spinning process, the front roller 2
4 and the nipple roller 13, the sliver S (and the fiber bundle Y0) is not ballooned, and therefore, the fiber f0 in the surface layer is released and dropped due to the vibration associated with the ballooning. However, the situation that a loss fiber is generated does not occur. Further, in the process in which the sliver S passes through the first nozzle 11 and becomes the fiber bundle Y0, the fibers f0 in the surface layer portion are the core fiber bundles f2.
Even if the rear end of the fiber f0 is released from the grip of the front roller 24 without being sufficiently wound around, the front end side of the fiber f0 (wrapped fiber f1) is already gripped by the nip roller 13 at this time. In addition, since the fibers are wound into the core fiber bundle f2 when they are bundled by false twisting of the second nozzle 12 on the downstream side of the nipple roller 13, the fibers f0 are separated on the downstream side of the first nozzle 11 and are lost. It never becomes a fiber.

Further, the converging point is on the downstream side of the nip roller 13 and immediately before the second nozzle 12, and the false twist transmission path by the second nozzle 12 is extremely short. Therefore, when a momentary mass change occurs in the fiber bundle. However, twist transmission is less likely to be hindered, and movement of the focusing point and accompanying yarn breakage during spinning are prevented.

[0024]

As described above, in the pneumatic spinning device of the present invention, the nip roller is provided between the first nozzle and the second nozzle which are arranged in series immediately after the front roller of the draft device.
Since the distance between the nip roller and the front roller is shorter than the average fiber length, the front roller and the nip roller are
Both ends of the fiber bundle are gripped by the blades before and after the first nozzle, and the ballooning in the first nozzle and the resulting loss fiber are suppressed. In addition to preventing reduction in yarn strength, the sliver's focusing point is stable, yarn breakage can be prevented, and yarn quality can be stabilized.

[Brief description of drawings]

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

FIG. 2 is a perspective view of essential parts 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 a conventional pneumatic spinning device.

FIG. 4 is a front view of a conventional spinning machine.

[Explanation of symbols]

 1 Pneumatic spinning device 2 Draft device 11 1st nozzle 12 2nd nozzle 13 Nip roller 24 Front roller S sliver Y Spun yarn f1 Wound fiber f2 Core fiber bundle

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[Procedure amendment]

[Submission date] October 14, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 4

[Correction method] Delete

Claims (1)

[Claims] 1. A nip roller is provided between a first nozzle and a second nozzle arranged in series immediately after a front roller of a draft device, and a distance between the nip roller and the front roller is shorter than an average fiber length. Pneumatic spinning device.