JPH10317231A - Spindle member for air fine spinning frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spindle capable of increasing the yarn strength of spun yarn in an air fine spinning frame for carrying out spinning by a spindle member and a turning air flow. SOLUTION: Since the tip part of a spindle 1 is rounded into a spherical shape and the surface of the spindle comprises a ceramic member lustered by polishing, the rotation of yarns by a turning air flow from a jetting nozzle (n) is smoothed at the tip part 3a of the spindle 1 and an unreasonable force is not applied to the yarns when sucked in the spindle and the winding of the yarns on a yarn bundle and sucking in the spindle 1 are performed while maintaining stable tension. Consequently yarn strength and physical properties of yarn are both improved and reducing effects on end breakage during spinning are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air spinning machine for producing a spun yarn by twisting a non-twisted short fiber bundle drafted by a drafting device by applying a swirling airflow thereto.

[0002]

2. Description of the Related Art The present applicant has previously proposed an air spinning machine for producing a real twist spun yarn using a spinning device shown in FIG.
A separate application has already been filed.

The spinning device has a nozzle member having a nozzle for applying a swirling airflow to a fiber bundle exiting a draft device, and has a tip portion located at a point where the swirling airflow acts from the nozzle member, and serves as a yarn passage. Consisting of a spindle member having a hollow portion and a guide member projecting toward the tip thereof toward the entrance thereof, the fiber bundle exiting the draft device is driven by a suction flow generated by the action of an air flow ejected from a nozzle. The front ends of all the fibers of the fiber bundle are drawn into the spindle from around the guide member by the fiber bundle being formed into a yarn. Further, the rear end of the fiber is inverted from the spindle inlet by the suction flow and the swirling airflow from the nozzle, and is separated into fibers. The separated fibers at the rear end are exposed to the swirling airflow from the nozzle, and are introduced into the spindle while being wound around the fiber bundle being formed into the yarn as the yarn travels, thereby forming a true twist. This results in the formation of a spun yarn.

[0004]

In the conventional spinning apparatus described above, the spun yarn has insufficient yarn strength, and research has been conducted by trial and error with various nozzle shapes and spindle shapes.

An object of the present invention is to solve the problems of the above-mentioned conventional spinning machine and to provide a spindle shape which can increase the yarn strength.

[0006]

According to a first aspect of the present invention, there is provided a nozzle member for applying a swirling airflow to a fiber bundle exiting a draft device, and a hollow portion serving as a yarn passage. In an air spinning machine having a spinning section constituted by a spindle member, the tip of the spindle member is spherically rounded. Accordingly, when the fibers at the rear end separated by the swirling airflow are wound around the fiber bundle being formed into the yarn as the yarn travels and become a real twisted spun yarn, the fibers are generated by the swirling airflow. While the rotation of the fiber is performed smoothly, no excessive force is applied when the fiber is drawn into the spindle, and while maintaining a stable tension, winding around the fiber bundle and drawing into the spindle are performed. As a result, the yarn strength could be increased. The gist of the present invention is that the surface of the spindle member is gloss-polished. Therefore, at the tip of the spindle, winding of the separated fiber around the fiber bundle and drawing into the spindle are performed more stably,
This was effective in stabilizing yarn strength and improving spinnability. Claim 3
The gist of the present invention is that the spindle member is made of ceramic. Therefore, the spindle member can be manufactured as an integrally molded product, and a stable yarn quality can be obtained without being worn even after long-time spinning.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is an enlarged view showing the tip shape of a spindle according to the present invention,
(A) is a spindle tip shape according to the present invention,
(B) is a conventional spindle tip shape. FIG. 2 is a sectional view of a spinning device to which the present invention is applied. FIG. 3 is an overall front view of a spinning machine to which the present invention is applied. FIGS. 4A and 4B show the state of air flow by numerical analysis. FIG. 4A shows the state of air flow in the case of a spindle having a spherical tip according to the present invention, and FIG. Is shown.

First, a spinning machine to which the present invention is applied will be described. As shown in FIG. 3, the spinning machine has a spinning unit U
After the sliver L is sent to the draft device D and formed into a spun yarn Y by the spinning unit Sp, the spun yarn Y passes through the nip roller Rn and the slab catcher Z, and is wound around the winding unit. W is wound up. P is a piecing device that performs piecing, and is configured to run below the inside of the spinning machine along the longitudinal direction of the spinning machine.

As shown in FIG. 2, the spinning device to which the present invention is applied is composed of a draft device D and a spinning unit Sp. The drafting device D is a so-called 4-wire drafting device including a back roller Rb, a third roller Rt, a second roller Rs having an apron, and a front roller Rf, each of which includes a pair of rollers. The drafting device D is a device for extending a sliver L supplied through a sliver guide T to a predetermined fineness, and performs drafting by gradually increasing the rotation speed of each roller.

The sliver L drafted to a predetermined thickness by passing through the draft device D is supplied to a spinning section Sp composed of a nozzle member N and a spindle member S, and is formed into a spun yarn Y. The spindle member S includes a stationary or rotating spindle 1. The nozzle member N has a plurality of air injection holes (nozzles) n perforated in a tangential direction. Spindle 1
The spun yarn Y is formed by a swirling airflow generated by injecting toward the front end of the spun yarn Y.

The fiber bundle that has exited the front roller Rf of the draft device is drawn into the casing from the hole 6 of the support member 5 of the guide member 4 by the suction flow generated by the action of the air flow ejected from the air ejection hole n. The front end of almost all the fibers of the fiber bundle is
The yarn is drawn by the fiber bundle being formed into the yarn and guided to the yarn passage 2 in the spindle 1. The rear end side of the fiber is inverted from the spindle tip 3 by the suction flow and the swirling airflow from the air injection hole n and is separated into fibers.

The separated fibers are exposed to the swirling airflow from the air injection holes n, and are introduced into the spindle while being spirally wound around the fiber bundle being formed into the yarn as the yarn travels. By doing so, there is a mechanism for forming a spun yarn having a real twist style. Guide member 4 at this time
A non-twisted core fiber that prevents the propagation of twist in the yarn forming process or temporarily acts as a substitute for the central fiber bundle, acts as a so-called pseudo-core, and appears remarkably in the conventional pneumatically bound spun yarn. It functions to prevent the formation and to form the yarn with only the wound fiber.

As shown in FIG. 1- (a), in the present invention, since the spindle tip 3a is chamfered in a spherical shape and the outer periphery of the tip is an arc-shaped corner, the air injection hole is provided at the spindle tip. While the fiber is swirled smoothly by the swirling airflow from n, no excessive force is applied when it is drawn into the spindle, and the fiber is wound around the fiber bundle and pulled into the spindle while maintaining a stable tension. Came to be. Further, when the spindle is made of ceramic (alumina) and the surface is gloss-polished (surface roughness of about 0.8 s), the rotation of the fiber and the drawing into the spindle described above are performed stably. Thus, yarn breakage was reduced and spinnability was clearly improved.

Here, a spindle tip 3a having a spherical shape shown in FIG. 1A according to the present invention, and FIG.
A comparison was made between yarn properties when a spinning experiment was performed using a conventional spindle tip 3b having a flat tip shown in (b). Table 1 shows the results. The machine conditions at this time are as follows: when the yarn speed is 350 m / min, the total draft is 153, the main draft is 45, the injection air pressure is 4 kg / cm ² , and cotton yarns Ne20 and Ne30 are spun.

[Table 1]

As shown in Table 1, all of the yarn strength, elongation, and uniformity indicating the degree of yarn unevenness are improved when a spindle having a spherical tip according to the present invention is used. The effect of the product of the present invention was confirmed. A computer was used to perform a numerical analysis on the flow of air when compressed air was injected from the air injection holes n to the tip of the spindle. FIG. 4 shows the results. (A) shows the air flow at the tip of a spindle having a spherical tip according to the present invention;
(B) shows the air flow at the tip of the conventional spindle. The numerical calculation is performed on the section AA of the spindle tip, and shows a quarter area including the compressed air jet n1 in the section, and the end 3at of the spherical spindle tip and the nozzle member are respectively shown. It shows the state of the air flow between the end 3 bt of the conventional spindle tip and the nozzle member inner wall Nt between the inner wall Nt, and the direction of the arrow indicates the direction of the air flow, and the length of the arrow indicates the wind speed. It shows the approximate size. As is apparent from FIG. 4, in the conventional spindle, a vortex SW is generated at a part of the tip, but in the case of the spindle having a spherical tip according to the present invention, the vortex does not occur and a smooth laminar flow is generated. It turns out that it is flow SS. Even from this result, the spindle with a spherical tip according to the present invention is
It is understood that the air spinning using the swirling air flow is effective.

[0016]

As described above, according to the present invention,
Since the shape of the tip of the spindle is rounded into a spherical shape, the fiber is smoothly swirled by the swirling airflow from the air injection hole n at the tip of the spindle, and excessive force is not applied when the fiber is drawn into the spindle. Without
As a result of winding around the fiber bundle and drawing into the spindle while maintaining stable tension,
As compared with a conventional yarn spun in a spindle shape, effects such as improved yarn strength and improved yarn physical properties and reduced yarn breakage during spinning were obtained. Further, since the surface of the spindle is made of ceramic and gloss-polished, the spindle can be manufactured as an integrally molded product, and stable yarn quality can be obtained without abrasion even after long-term spinning.

[Brief description of the drawings]

FIG. 1 is an enlarged view showing a tip shape of a spindle according to the present invention, wherein (a) is a spindle tip shape according to the present invention, and (b) is a conventional spindle tip shape.

FIG. 2 is a sectional view of a spinning device to which the present invention is applied.

FIG. 3 is an overall front view of a spinning machine to which the present invention is applied.

4A and 4B are views showing an air flow obtained by numerical analysis, in which FIG. 4A shows the air flow at the tip of a spindle having a spherical tip according to the present invention, and FIG. 2 shows the state of airflow in the section.

[Explanation of symbols]

 Reference Signs List 1 spindle 2 yarn passage 3a spindle tip (spherical shape) 3b spindle tip (flat shape) 4 guide member 5 support member Sp spinning section N nozzle member Nt nozzle member inner wall S spindle member D draft device P piecing device L sliver Y spun yarn

Claims (3)

[Claims] 1. An air spinning machine having a spinning section comprising a nozzle member for applying a swirling airflow to a fiber bundle exiting a draft device and a spindle member having a hollow portion serving as a yarn passage, A spindle member of an air spinning machine, wherein a tip portion is rounded into a spherical shape. 2. The spindle member according to claim 1, wherein the surface of the spindle member is gloss-polished. 3. The spindle member according to claim 1, wherein the spindle member is made of ceramic.