JPH05156527A - Front roller - Google Patents

Abstract

PURPOSE:To prevent diffusion of yarn by an accompanying air flow and to improve uniformity of yarn by forming inclined grooves in a right-handed screw or left-handed screw direction on the whole periphery of a front roller corresponding to the twisting direction of yarn bundle. CONSTITUTION:In feeding a yarn bundle through a front roller 4 to an air circling nozzle in an air type fasciated spinning, when the yarn bundle immediately after passing through the front roller 4 is converged in S twist, grooves G inclined in the right-handed screw direction are formed on the whole periphery of a bottom roller 4a and when the yarn bundle is converged in Z twist, the grooves inclined in the left-handed screw direction are made. The grooves G may be arranged on a top roller 4b or both on the top and the bottom rollers 4a and 4b. An accompanying air flow shown by a thick arrow produced at the front roller 4 part with high-speed revolution flows along the grooves G at the contact part between the top roller 4b and the bottom roller 4a and the yarn bundle rides on the accompanying air flow, is drafted to an air circling nozzle side, wrapped in the revolving yarn bundle and will not diffuse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front roller used in a high-speed spinning device such as a pneumatic bound yarn spinning device having two air jet nozzles in which jetted air streams have different swirling directions.

[0002]

2. Description of the Related Art An air spinning device as shown in FIG.
An air spinning device in which a twisting device 8 including two air injection nozzles 6 and 7 that eject swirling air streams in different directions next to the draft device 5 is arranged is already widely known.

[0003]

The pneumatic spinning device has a high productivity of spinning about 15 times (180 to 300 m / min or more) as compared with a ring spinning machine, and a wide spinning range (Ne10 to N).
e80), omission of steps, and energy saving. However, since the front roller 4 used in the draft device 5 of this pneumatic spinning device also rotates at a very high speed, as shown by the arrow in FIG. 4, along the outer peripheral surfaces of the bottom roller 4a and the top roller 4b thereof. As a result, an associated air flow is generated in the rotation direction, and the fibers are diffused in the axial direction of the front roller 4 by riding on the associated air flow to reduce the yarn uniformity.

It is an object of the present invention to provide a front roller for high speed rotation which can prevent the diffusion of fibers due to the accompanying air flow.

[0005]

In order to achieve the above object, the front roller of the present invention, depending on whether the twist direction of the fiber bundle immediately after passing through the front roller is S twist or Z twist, A groove that is inclined in the right-hand screw direction and the left-hand screw direction is formed on the entire circumference.

[0006]

[Operation] In the front roller configured as described above, the fiber bundle is drafted while moving along with the accompanying airflow that flows along the inclined groove of the roller from the contact portion between the top roller and the bottom roller. After passing through the contact portion between the roller and the bottom roller, the fiber bundle is wound into a rotating fiber bundle.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring first to FIGS. 1 and 2, first, an outline of the entire pneumatic spinning device adopting the front roller of the present invention will be described.

This pneumatic spinning device includes a draft device 5 composed of a pair of back roller 1, a middle roller 3 equipped with an apron 2 and a front roller 4, and two drafting devices for ejecting swirling air streams in mutually different directions. A twisting device 8 including air injection nozzles 6 and 7 and a pair of delivery rollers 9 are provided.

In this pneumatic spinning device, the staple fiber bundle S pulled out from the can is introduced between the roller pairs of the drafting device 5 and sent out to be drafted to a predetermined thickness, and then introduced into the first air jet nozzle 6. Then, the jet swirling airflow causes a balloon to be generated in the staple fiber bundle S, and then the jet swirling airflow in the opposite direction of the second air jet nozzle 7 causes the staple fiber bundle S to be discharged.
Is twisted. Thus, the spun yarn Y having the appearance shown in FIG.
Is formed, and is taken out by the pair of delivery rollers 9 and wound around the package P.

Looking at the manufacturing process of this spun yarn Y in more detail, a substantial portion of the fiber bundle emerging from the front roller 4 is false-twisted by the second air injection nozzle 7 (the twisting is carried out to the front roller inlet). However, some of the fibers are still gripped by the front roller 4 at the rear end and free at the front end by the balloon of the first air injection nozzle 6 in the direction opposite to the false twist. There is. This fiber is wound around the convergent fiber bundle in the direction opposite to the false twist by the action of the swirling air flow ejected from the balloon and the first air injection nozzle 6. The wound fiber is wound more and more strongly with a sufficient number of turns in the process of passing through the second air injection nozzle 7 and being untwisted. As shown in FIG. 2, the yarn produced in this way becomes a bundled spun yarn composed of parallel core fibers F ₁ and wound fibers F ₂ wound around the core fibers F ₁ .

Next, an embodiment of the present invention will be described with reference to FIGS. 3 and 5 by taking a front bottom roller as an example.

The front bottom roller 4a is inclined in the right-hand screw direction when the fiber bundle immediately after passing through the front roller 4 is converged into S twist, and is inclined in the left-hand screw direction when converged into Z twist. The groove G is provided all around. The inclination angle of the groove G is in the range of 5 ° to 60 °. The roller forming the inclined groove G may be a front top roller or both.

The accompanying airflow generated by the thick arrow at the front roller portion flows along the inclined groove G of the bottom roller 4a at the contact portion between the top roller 4b and the bottom roller 4a. Therefore, most of the fiber bundles are drafted on the side of the first air injection nozzle along with the accompanying airflow, are caught by the rotating fiber bundles, and do not diffuse.

To repeatedly describe, when the fiber bundle is converged by S twist immediately after passing through the front roller, the front bottom roller 4a having the groove G inclined in the direction (right-hand screw direction) shown in FIG. 3 is used. In the spinning device, the twist of the yarn finally becomes the Z twist. On the contrary, in the case of converging by Z twist, the front bottom roller 4a having a groove inclined in the direction opposite to that shown in FIG. 3 (left-hand screw direction) is used. It becomes S twist. This relationship will be further clarified by FIG. The front bottom roller 4a is not limited to an air spinning device having two air jet nozzles having different swirling directions of the jetted airflow, and any spinning device having a very high spinning speed can be used. It can also be used in devices,
This is particularly effective when applied to a binding yarn spinning device.

[0015]

Since the present invention is constructed as described above, it has the following effects.

That is, it is possible to prevent the fibers from diffusing due to the accompanying air flow generated by the high speed rotation of the front roller,
Therefore, the evenness of the yarn can be increased and the yarn quality can be improved. Moreover, the cotton drop rate can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic side view of a pneumatic spinning device.

FIG. 2 is an external view of spun yarn spun by an air spinning device.

FIG. 3 is a perspective view of a front roller of the present invention.

FIG. 4 is a perspective view of a conventional front roller.

FIG. 5 is a perspective view of a main part of an air spinning device that employs a front roller of the present invention.

[Explanation of symbols]

 4 Front roller 4a Front bottom roller 4b Front top roller G groove

Claims (1)

[Claims] 1. A front roller in which a groove inclined rightward or leftward is formed on the entire circumference depending on whether the twisting direction of the fiber bundle immediately after passing through the front roller is S twisting or Z twisting. ..