JPH0546974U - Front roller - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a front roller for high-speed rotation, which can prevent the diffusion of fibers due to an entrained air flow and improve the yarn evenness. [Structure] A central portion A in which a lateral groove G ₁ parallel to the axial direction is formed on the entire circumference and vertical grooves G formed around the respective sides thereof.
₂ and a side portion B adjacent to the side portion B having no groove.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a front roller of a draft device used for a pneumatic bound yarn spinning device or the like having two air jet nozzles in which jetted air streams have different swirling directions.

[0002]

[Prior Art]

 An air spinning device as shown in FIG. 1, that is, 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, It is already widely known.

[0003]

[Problems to be solved by the device]

 Pneumatic spinning equipment has excellent productivity such as high productivity, about 15 times faster than ring spinning machine (180-300m / min or more), wide spinning range (Ne10-Ne80), omission of process, and energy saving. It has different characteristics. 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 thick arrow in Fig. 4, the bottom roller 4a and the top roller 4b have outer peripheral surfaces. Along with this, an associated airflow is generated in the rotation direction, and the fibers spread on the associated airflow in the axial direction of the front roller 4 to reduce the yarn uniformity.

An object of the present invention is to provide a front roller for high speed rotation, which can prevent the fibers from diffusing due to the accompanying air current and improve the evenness of the yarn.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the front roller of the present invention has a central portion in which transverse grooves parallel to the axial direction are formed on the entire circumference, vertical grooves formed on the peripheries of the respective sides, and adjacent circumferential grooves It is composed of a side portion having no groove on the surface.

[0006]

[Work]

 In the front roller configured as described above, the associated airflow that flows axially from each side toward the central portion suppresses the associated airflow that flows axially from the central portion to the fibers that pass through the central portion. The diffusion of the bundle to both sides in the axial direction is suppressed. At that time, the accompanying airflow per unit width generated on each side is strong because there are no lateral grooves.

[0007]

【Example】

 First, with reference to FIG. 1 and FIG. 2, an outline of the whole pneumatic spinning device in which the front roller of the present invention is adopted will be described.

This pneumatic spinning device includes a draft device 5 including a back roller 1, a middle roller 3 equipped with an apron 2 and a front roller 4, and two drafting devices that eject swirling airflows in different directions. The twisting device 8 includes air injection nozzles 6 and 7, and a pair of delivery rollers 9.

In this air spinning device, the staple fiber bundle S 2 drawn out from the can is introduced between the roller pairs of the drafting device 5 and is sent out to be drafted to a predetermined thickness, and the first air jet nozzle 6 When introduced, the jetted swirling airflow causes a balloon to be generated in the staple fiber bundle S, and then the jetting swirling airflow in the opposite direction of the second air jet nozzle 7 imparts a twist to the staple fiber bundle S. Thus, the spun yarn Y having the appearance shown in FIG. 2 is formed, drawn out by the pair of delivery rollers 9, and wound into the package P.

Looking at the manufacturing process of this spun yarn Y in more detail, a substantial portion of the fiber bundle discharged from the front roller 4 is false-twisted by the second air injection nozzle 7 (the twist is 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. Has become. The fibers are wound around the convergent fiber bundle in the direction opposite to the false twist by the action of the swirling air flow jetted from the balloon and the first air jet nozzle 6. The wound fiber passes through the second air injection nozzle 7 and is untwisted, and is wound more and more strongly with a sufficient number of windings. As shown in FIG. 2, the yarn thus produced is a bundled spun yarn composed of parallel core fibers F ₁ and wound fibers F ₂ wrapped around the core fibers F ₁ .

Next, referring to FIG. 3, an embodiment of the present invention will be described by taking a front bottom roller as an example. The present invention may be applied to either one or both of the front rollers.

The front bottom roller 4a has a central portion (a portion for gripping a fiber bundle) A in which a lateral groove G ₂ parallel to the axial direction is formed all around, and vertical portions formed around each side thereof. It is made of metal and is composed of a groove G ₁ and a side portion B adjacent to the groove G ₁ having no groove. The front top roller is made of rubber. Thus, the bottom roller is usually made of metal and the top roller is made of rubber, but the material is not particularly limited. If a metal roller is provided with grooves, it is advantageous in terms of durability.

The front bottom roller 4a includes a central portion A, side portions B and two vertical grooves G. ₁ The total width of the above is about 40 mm, and the width of the central part A must be enough to pass a fiber bundle of about 5 mm.

Also in the front roller 4 having the front bottom roller 4a having such a configuration, as shown by the thick line in FIG. 3, the accompanying airflow is generated by the high speed rotation.

By the way, in the process of devising the front bottom roller of the present invention, a trial trial was made of a front bottom roller 4a in which lateral grooves parallel to the axial direction were formed on each side B as well. An accompanying air flow is generated. That is, the associated airflow flows toward the nip point along the peripheral surface of the front top roller 4b and the peripheral surfaces of the parts B, A, B of the front bottom roller 4a, and from the respective parts from the nip point. It spreads out on both sides in the axial direction and flows into the vertical groove G ₁ , and flows out forward. At this time, the airflow flowing from each side portion B toward the central portion A in the axial direction suppresses the airflow flowing from the central portion A to both sides in the axial direction. Therefore, even if the lateral groove is formed in the side portion B, it is possible to prevent the fiber bundle passing through the central portion A from spreading to both sides in the axial direction.

When the lateral groove is not provided on each side portion B as in the front roller 4 of the present invention, the strength of the accompanying airflow generated on each side portion B is stronger than when the lateral groove is provided on each side portion B. Since the size is large, the effect of suppressing the airflow flowing from the central portion A to both sides in the axial direction is greater. Therefore, it is possible to more reliably suppress the diffusion of the fiber bundle passing through the central portion A to both sides in the axial direction. From the results of actual experiments, the strength of the accompanying airflow generated in the side portion B was larger in the case where the lateral groove was not provided than in the case where the lateral groove was provided.

The front bottom roller 4a is not limited to an air spinning device having two air jet nozzles in which jetted air streams have different swirling directions, and any other high-speed spinning device having a very high spinning speed can be used. It can be applied to any spinning device.

[0018]

[Effect of the device]

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

That is, it is possible to prevent the fibers from diffusing due to the accompanying airflow generated by the high-speed rotation of the front roller, and thus to improve the evenness of the yarn and improve the yarn quality. 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 bottom roller of the present invention.

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

[Explanation of symbols]

4 Front Roller 4a Front Bottom Roller 4b Front Top Roller A Front Bottom Roller Central Part B Front Bottom Roller Side Part G ₁ Horizontal Groove G ₂ Vertical Groove

Claims (1)

[Scope of utility model registration request] 1. A central portion in which lateral grooves parallel to the axial direction are formed on the entire circumference, and vertical grooves formed around the respective sides thereof.
A front roller consisting of a side portion having no groove on the peripheral surface adjacent to it.