JPH0770833A - Air fine spinning device - Google Patents

Abstract

PURPOSE:To produce an air fine spinning device capable of producing a spun yarn high in the constituting ratio of wound fibers, having a real twist-like appearance and excellent in the tenacity of the yarn. CONSTITUTION:The air fine spinning device has a nozzle 3 installed on the downstream side of a yarn guide from the front roller 24 of a draft device, and a yarn guide pipe 4 installed in the nozzle. An air-jetting port 34 for generating a revolution air flow in the inlet of the yarn guide pipe is placed in the nozzle, and a fiber bundle twist setter 5 is placed between the nozzle and the front roller.

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 (introduction nozzle) and a second nozzle (twisting nozzle) that generate swirling airflows in opposite directions.

That is, the sliver drafted by the drafting device and flattened and spread, when fed from the front roller, 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] When the above-mentioned unconstrained fibers are wound around the core fiber bundle as a core fiber bundle in the direction opposite to the false twist due to the action of the swirling air current in the first nozzle. In addition, as a result of being further wound around the core fiber bundle in the process of untwisting the false twist passing through the second nozzle, there is almost no twist and there are wound fibers around the parallel core fiber bundle. A twisted spun yarn is formed.

In order to increase the yarn strength of the bundled spun yarn in such an air spinning device, it is essential to increase the amount of the wound fiber and to keep the amount of the wound fiber constant. 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 marrow-associated airflow due to the rotation of the front roller are involved in the generation of the restrained fiber, the amount of the wound fiber Was difficult to control intentionally. 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.

[0006]

In view of the above-mentioned problems of the prior art, the present invention provides a spun yarn which has a high constituent ratio of wound fibers and which has a true twist appearance and which is excellent in yarn strength. An object of the present invention is to provide a manufacturable pneumatic spinning device.

[0007]

A nozzle disposed on the downstream side of a yarn path of a front roller of a draft device and a yarn guide tube provided inside the nozzle, the nozzle including the yarn guide tube An air injection port for generating a swirling airflow was provided at the inlet, and a twisting member for the fiber bundle was provided between the nozzle and the front roller.

[0008]

The fiber bundle drafted by the draft device and delivered from the front roller is introduced into the nozzle through the twisting member. The false twist imparted to the fiber bundle by the swirling airflow in the nozzle is By the twisting member of the fiber bundle,
Since the transmission to the upstream side is blocked, the fiber bundle is introduced into the nozzle in a substantially parallel state, during which the rear end free fibers that have passed through the nip point of the front roller and become unrestrained Generate a large amount.

When the fiber bundle accompanied by the large amount of the trailing-end free fibers is introduced into the nozzle, the trailing-end free fibers are moved by the action of the swirling airflow in the nozzle, and the trailing-end free fibers are gathered in the central portion by false twisting. It is separated from a part of the fiber bundle, and is spirally wound around the tip of the yarn guiding tube once along the swirling direction of the air flow. Furthermore,
As the bundled fiber bundle advances in the yarn guide tube, the trailing end free fiber wound around the yarn guide tube is wound around the bundled fiber bundle as a core fiber bundle to form a wound fiber. As a result, a spun yarn having a true twisted appearance, in which the wound fibers are uniformly distributed over the entire length of the yarn around the core fiber bundle, can be obtained.

In the above-mentioned spinning process, the twisting member not only prevents the false twist from going up, but also restricts the swirling region of the air flow in the nozzle to promote the production of the trailing end free fiber which becomes the wound fiber. First, it stabilizes the ballooning of the fiber bundle in the nozzle, improves the evenness of the yarn, and improves the yarn strength.

[0011]

Embodiments will be described with reference to the drawings.

1 to 3 show an air spinning device 1 according to a first embodiment of the present invention, and FIG. 4 shows an air spinning device 1 according to the second embodiment of the present invention. In the figure, pneumatic spinning device 1
Is a nozzle (twisting nozzle) 3 provided on the downstream side of a four-wire draft device 2 including a back roller pair 21, a third roller pair 22, a middle roller pair 23 mounted with an apron belt e, and a front roller pair 24. Mainly composed of a yarn guide tube 4 having a tip end portion 41 located inside the nozzle 3 and an axis center with the nozzle 3 and a twisting member 5 provided on the upstream side of the yarn guide path of the yarn guide tube 4. Has been done.

The nozzle 3 penetrates the nozzle block 32 fitted in the housing 31, is widened in a conical shape at the central portion from a small-diameter inlet 35, and is drilled in a stepped cylindrical shape to reach a large-diameter outlet 36. In addition, the nozzle block 32 is laterally penetrated, and a compressed air injection hole 34 is opened from the air supply passage 33 in the housing 31 in the tangential direction of the inner surface of the nozzle 3. The compressed air jet holes 34 are inclined with respect to the yarn path at an angle of 60 ° toward the downstream side, so that the suction airflow is easily generated on the upstream side of the yarn path of the nozzle 3.

The yarn guide tube 4 has a cylindrical shape, and the tip portion 41 has a tapered conical shape. Further, the rear end side is integrated with the nozzle block 62 of the suction nozzle 6, and a yarn guide hole 42 penetrates from the yarn guide tube front end portion 41 toward the suction nozzle 6 in the central portion. On the inner side surface of the suction nozzle 6, the nozzle block 62 is penetrated from the air supply passage 63 in the housing 61, and the compressed air injection hole 64 is inclined and opened to the downstream side, and the suction nozzle 6 is opened from the compressed air injection hole 64. By injecting compressed air into the inside, it is possible to generate a suction airflow from the tip portion 41 of the yarn guiding tube 4 to the delivery port 65. The housing 61 and the housing 3 of the nozzle 3
An exhaust portion 8 of the nozzle 3 is provided between the nozzle 1 and the nozzle 1.

As shown in FIG. 3, the twist preventing member 5 penetrates both sides of a disk-shaped member to form a fiber bundle guide path 51. The fiber bundle guide path 51 has a substantially circular shape at the introduction port 52, but has a slit shape at the delivery port 53 (or in the vicinity of the delivery port 53). Opposing guide surfaces 54, 5
5 has an asymptotically inverted V-shaped cross section, and is basically formed in a flat funnel shape. The flat direction is the front roller pair 24.
Is preferably parallel to the width direction of.

Further, at least one of the upper and lower guide surfaces 54, 55 reaching the slit-shaped delivery port 53 is connected to the yarn guiding tube 4 from the nip point of the front roller pair 24 through the introduction port 71 of the nozzle cap 7 described later. It has ridges (55p, 54p) that bulge beyond the running line of the fiber bundle, and allows the fiber bundle S to come into contact with the ridges while slightly bending the fiber bundle S. In the first embodiment shown in FIGS. 1 to 3, one ridge portion 55p is formed only on the lower guide surface 55. Further, in the second embodiment shown in FIG. 4, the upper guide surface 5
4, the ridges 54p are formed in the vicinity of the delivery port 53 and the ridges 55p are formed alternately in the center of the lower guide surface 55 and slightly near the introduction port 52, so that the fiber bundle guide path 51 is bent into a substantially S-shape. ing. Instead of bulging the peak portions (55p, 54p) with respect to the fiber bundle running line, the fiber bundle running line itself may be refracted at the portion.

The anti-twisting member 5 is fixed to the end face of the inlet port 35 of the nozzle 3 by fixing the nozzle cap 7 to the nozzle block 32 in a state of being fitted in the nozzle cap 7. As a result, the inside of the nozzle 3 and the inside 72 of the nozzle cap 7 and the front roller pair 24 side are separated by the twist stopper 5.

The nozzle cap 7 has a conical shape with a flat tip, and has a flat introduction port 71 which is parallel to the width direction of the front roller pair 24 and is opened close to the nip portion of the front roller pair 24. .

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

When the compressed air is injected into the nozzle 3 through the compressed air injection hole 34, a swirling airflow is generated inside the nozzle 3, and the swirling airflow circulates the yarn guide tube 4 and the delivery port 36 of the nozzle 3.
After that, it reaches the exhaust unit 8 and is diffused and exhausted. Accordingly, on the introduction side of the nozzle 3, a suction airflow is generated from the introduction port 71 of the nozzle cap 7 to the inside of the nozzle 3 through the inside 72 and the fiber bundle guide path 51 of the twisting preventing member 5. At this time, the inside of the nozzle 3 and the inside of the nozzle cap 72 are partitioned by the twist stopper 5 and communicated only with the slit-shaped delivery port 53, so that the suction airflow does not substantially swirl and is parallel. It has a nice air flow.

On the other hand, the draft device 2 is introduced from the introduction guide 25.
When the sliver (fiber bundle) S introduced into the nozzle cap 2 is drafted by the draft device 2 and sent in a state of being flatly spread by the front roller pair 24, the sliver (fiber bundle) S is introduced into the nozzle cap interior 72 from the introduction port 71 by the suction airflow. It is sucked and introduced into the nozzle 3 via the fiber bundle guide path 51 of the twist stopper 5.

At this time, in the fiber bundle guide path 51 of the twisting member 5, the fiber bundle S is provided with upper and lower guide surfaces 54 and 55.
Since it is slightly bent by the ridges 54p, 55p and is in contact with the ridges 54p, 55p, the false twist due to the swirling airflow in the nozzle 3 is transmitted to the upstream side from the ridges 54p, 55p of the anti-twisting member 5. Is blocked. Further, the suction airflow on the upstream side of the twisting preventing member 5 is a parallel airflow without swirling as described above. Therefore, the fiber bundle S delivered from the front roller pair 24 is not converged but is delivered into the nozzle 3 in a substantially parallel state by the suction airflow. During this time, free fibers fo (mainly trailing end free fibers) that have passed through the nip of the front roller pair 24 and are in an unrestrained state are generated and increase in the fiber bundle S.

When such a parallel fiber bundle S containing a large amount of trailing end free fibers fo is introduced into the nozzle 3 through the twisting member 5, the false twisting due to the swirling air flow in the nozzle 3 is carried out. Then, a part of the fibers (f2) in the central portion are bundled and sucked into the yarn guiding tube 4 by the suction airflow from the suction nozzle 6. However, the trailing-end free fibers fo are separated from the bundled fiber bundles f2 due to the fact that compressed air is blown in the nozzles 3 and the airflow flowing to the delivery port 36 of the nozzles 3 while circulating around the yarn guiding tube 4. Then, as shown by f1 in FIGS. 2 and 4, the spiral tip is once wound around the conical tip portion 41 of the yarn guiding tube 4 along the swirling direction of the air flow.

Next, the rear end free fibers f1 wound around the yarn guide tube 4 are drawn into the yarn guide tube 4 as the fiber bundle S advances, and the fiber bundles f2 bundled by the false twist are core fibers. As a bundle, it is wound around the core fiber bundle f2 in the same direction as the swirling direction of the air flow to form a wound fiber f1. And
Since the winding direction of the wound fiber f1 is opposite to the false twisting direction of the core fiber bundle f2, it is wound in the process of untwisting the false twist of the core fiber bundle f2 in the yarn guiding tube 4. Attached fiber f1 is core fiber bundle f2
Is further wound around to form a spun yarn Y, passes through the suction nozzle 6, and is delivered from a delivery roller (not shown). After the spun yarn Y is taken up by the delivery roller, the suction of the suction nozzle 6 is stopped.

FIG. 5 shows a spun yarn Y obtained through the above spinning process by the pneumatic spinning device 1 of the embodiment of the present invention. As shown in the figure, the spun yarn Y has a structure of a bundled spun yarn that is twisted due to the presence of the wound fiber f1 around the substantially parallel core fiber bundle f2. The amount is much larger than that of the conventional bound spun yarn, and is evenly distributed over the entire yarn at a substantially constant wrapping angle (about 40 °). It has a twisted appearance.
In addition, the yarn strength is also greatly improved by this. The front end side (left side in FIG. 5) of the wound fiber f1 is twisted with the yarn itself to form the core fiber bundle f2, and the rear end side is partially loose fluff, but the amount of fluff is comparative. It is getting scarce.

These characteristics of the spun yarn Y produced by the pneumatic spinning device 1 according to the embodiment of the present invention are due to the following structural characteristics. That is, the twisting member 5 is interposed between the tip end portion 41 of the yarn guiding tube 4 serving as the twisting portion and the nip point of the front roller pair 24, so that the portion where the swirling air flow acts on the fiber bundle S can be extended. This is because the fiber bundle S is extremely short, and the fiber bundle S is supported on both sides thereof, so that the ballooning of the fiber bundle S is small and stable.

In particular, even when spinning cotton having an asymmetric fiber length, a sufficient amount of the wound fiber f1 can be secured, the wound fiber f1 appears intermittently, and the yarn strength is increased. In addition to preventing such a situation, the ballooning is less likely to be broken even if a momentary mass change occurs in the fiber bundle, and the occurrence of yarn breakage associated therewith is suppressed.

[0028]

The pneumatic spinning device of the present invention is, as described above,
An air jet that has a nozzle arranged on the downstream side of the yarn path of the front roller of the draft device and a yarn guide tube provided inside the nozzle, and an air jet that generates a swirling airflow at the inlet of the yarn guide tube in the nozzle. Since a mouth is provided and a twisting member for the fiber bundle is further provided between the nozzle and the front roller,
It is possible to produce a spun yarn having a high constituent ratio of the wrapping fiber, a uniform twisted appearance that is evenly distributed over the entire yarn, a good evenness of the yarn, and an excellent yarn strength. It is possible.

[Brief description of drawings]

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

FIG. 2 is a cross-sectional plan view of essential parts showing the pneumatic spinning device according to the first embodiment of the present invention.

FIG. 3 is a perspective view showing a twist stopper and a nozzle cap.

FIG. 4 is a side sectional view of a main part showing an air spinning device according to a second embodiment of the present invention.

FIG. 5 is a view showing the appearance of spun yarn by the pneumatic spinning device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pneumatic spinning device 2 Draft device 3 Nozzle 4 Yarn guide tube 5 Twisting member 24 Front roller 34 Compressed air injection port S Fiber bundle (sliver) Y Spun yarn f1 Wound fiber f Core fiber bundle

Claims (1)

[Claims] 1. A nozzle arranged on a downstream side of a yarn path of a front roller of a draft device, and a yarn guide tube provided inside the nozzle, wherein the nozzle has a swirling airflow at an inlet of the yarn guide tube. An air spinning device, which is provided with an air injection port for generating a fiber, and further provided with a twisting member for the fiber bundle between the nozzle and the front roller.