JPH0413274B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a yarn feeding roller device, and more particularly to a yarn feeding roller device used in a feed device or a drawing device that supplies yarn at high speed.

The present invention is preferable as a roller device for drawing thermoplastic synthetic fiber yarns such as polyester and polyamide. In this case, the roller device of the present invention is arranged in parallel with a large-diameter drive roller such as a cylindrical heating roller connected to a drive motor, and the yarn is wound between them and driven to rotate. It consists of separate rollers.

The present invention is particularly suitable for implementing the direct spinning drawing method and the direct spinning drawing false twisting method.

[Conventional technology]

A large-diameter cylindrical heating roller that is driven and rotated as a heated drawing section for the yarn in the direct spinning drawing method;
The yarn is wound between the heating roller and a small-diameter separate roller arranged in parallel.

[Problem that the invention seeks to solve]

When the circumferential speed of the roller increases in such a device consisting of a large-diameter drive roller and a small-diameter separate roller, the separate roller is exposed to tension fluctuations due to the accompanying airflow generated around the large-diameter drive roller. The upper thread swings in the axial direction of the separate roller. In particular, in the case of a heating roller, since the wound yarn is heated, elongated and relaxed, the yarn tends to sway in the axial direction of the roller when it receives the accompanying airflow with the yarn tension reduced due to elongation.

Because of this yarn sway, adjacent yarns wound between the large-diameter heating roller and the small-diameter separate roller may come into contact with each other, or when the yarn moves on the roller, the axial direction of the roller may change. Due to friction etc., fuzz,
Single yarn cracking (a phenomenon in which the single yarns of a multifilament come apart due to yarn shaking), yarn breakage, etc. occur. Furthermore, in order to prevent the yarns from coming into contact with each other when the yarns sway, it is necessary to increase the yarn pitch, which increases the length of the rollers and increases costs.

[Purpose of the invention]

The present invention changes the flow of the airflow that accompanies the large-diameter heating roller to prevent the airflow that accompanies the large-diameter heating roller from directly hitting the yarn on the separation roller, so that the yarn is separated from the axis of the separation roller. The purpose of the present invention is to prevent swinging in the direction of the drawn yarn, reduce fuzz, single yarn cracking, yarn breakage, etc. of the drawn yarn, and reduce costs by shortening the roller length.

[Means for solving problems]

The present invention comprises a large-diameter drive roller connected to a drive motor, and a small-diameter separate roller arranged in parallel with the drive roller and rotated by a yarn wound between the drive roller, A windbreak plate is provided between the drive roller and the separate roller to prevent the yarn from swinging due to the accompanying airflow of the drive roller, and the tip of the windbreak plate is located near the circumferential surface of the drive roller, and the other end is located near the circumferential surface of the drive roller. The above object is achieved by a yarn swing prevention device in a yarn feeding roller device, which is biased closer to the center of the two rollers than the yarn path of the yarn wound around the separate rollers.

It is preferable that the windbreak plate of the present invention is provided in a range of 1/2 to 2/3 from the tip side to the root side of the drive roller.

[Effect]

In a yarn feeding roller device consisting of a large-diameter drive roller and a small-diameter driven separate roller, a large amount of airflow accompanying the large-diameter drive roller is likely to be generated compared to a small-diameter separate roller. On the other hand, since the separation roller is frictionally driven and rotated by the yarn, the yarn tension before and after the separation roller tends to fluctuate, and yarn swinging is more likely to occur on the separation roller than on the drive roller. Moreover, in this type of yarn feeding device, the drive roller and separate roller are usually very close to each other, and the accompanying airflow generated by the rotation of the drive roller described above tends to act on the yarn on the separate roller. This will encourage the yarn to sway.

In the present invention, a windbreak plate is provided between the drive roller and the separate roller, and the airflow accompanying the drive roller rotating at high speed is changed by the windbreak plate.
The accompanying airflow generated by the drive roller hits the yarn wound around the separate roller, preventing the yarn from swinging.

In the present invention, in order to sufficiently enhance the effect of the windbreak plate, the tip of the windbreak plate is located near the large-diameter drive roller where entrainment airflow is likely to be generated. According to the present invention, the accompanying airflow generated by the rotation of the large-diameter drive roller is stopped by the windbreak plate, thereby significantly reducing the occurrence of the accompanying airflow.

Furthermore, in order to prevent the accompanying air flow stopped by the windbreak plate from blowing onto the separate roller provided very close to the drive roller and hitting the yarn on the separate roller and causing the yarn to sway, other than the windbreak plate of the present invention is used. The end is biased closer to the center of both rollers than the yarn path of the yarn wound around the drive roller and the separate roller, and the windbreak plate is directed inward from the yarn path. As a result, the accompanying airflow generated by the rotation of the drive roller and stopped by the windbreak plate is guided by the windbreak plate to a location where the separate roller is not located, so the accompanying airflow does not blow against the separate roller, reducing the amount of accompanying airflow. Combined with this, the yarn swinging on the separate rollers is prevented.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 7 is a schematic front view of a direct spinning drawing and take-off apparatus according to the present invention, in which downstream of a melt spinneret (not shown) there is a spinning tube 10 that cools the yarn with cooling air, and an oil agent applied to the yarn. Adhesive oil application device 11
A thread guide 12 is provided downstream of the thread guide 12 for collecting the single threads constituting the thread into threads. A yarn feed roller device according to the present invention is provided downstream of the yarn guide 12. A yarn feeding roller device according to the present invention is also provided diagonally above the yarn feeding roller device, and the yarn is drawn between both yarn feeding roller devices. The stretched yarn passes through a traverse yarn guide 13, is traversed left and right by a traverse guide 14, and is wound onto a bobbin 16 driven and rotated by a friction roller 15 as a yarn package 17.

The yarn feed roller device of the present invention will be explained based on FIG.

In FIG. 1, a large-diameter cylindrical heating roller 4, which has a known heating mechanism inside and is connected to a drive motor (not shown), is rotatably protruded from the machine base.

Substantially parallel to the cylindrical heating roller 4, a small-diameter separate roller 1 is freely rotatably supported on a machine stand.

The yarn Y fed from the upper right side of FIG. Wind it clockwise, then from the right side of the separate roller 1 to the right side of the heating roller 4, and then wind it around the heating roller 4 and the separate roller 1 in the same manner.
It is sent out from the heating roller 4 to the upper left.

A bracket 5 is attached by a bolt 6 to a position on the machine base between the separate roller 1 and the heating roller 4, which corresponds to a location surrounded by the yarn wound around the separate roller 1 and the heating roller 4.
A supporter 2 is attached to a bracket 5 and fixed with a set screw 7. Supporter 2 has
The windbreak plate 3 is attached with set screws 8.
The tip of the windbreak plate 3 is located near the yarn path from the heating roller 4 to the separate roller 1, with a space of about 1 mm from the large-diameter heating roller 4.
On the other hand, the other end of the windbreak plate 3 is located at the supporter 2, and is located closer to both rollers 1 and 4 than the yarn path of the yarn Y wound around the drive roller 4 and separate roller 1.
It is biased towards the center of the

The rotation of the large-diameter drive heating roller 4 generates an airflow that accompanies the heating roller 4. In this embodiment, the windbreak plate 3 whose tip is positioned near the circumferential surface of the heating roller 4 prevents such airflow. Reduces the generation of entrained airflow. Furthermore, the other end of the windbreak plate 3 is biased toward the center of both rollers 1 and 4 rather than the yarn path of the yarn Y wound around the heating roller 4 and the separate roller 1, and the windbreak plate is directed inward from the yarn path. Therefore, the accompanying airflow stopped by the windbreak plate 3 can be prevented from directly hitting the yarn on the separate roller 1, and together with the reduction in the amount of accompanying airflow, yarn sway can be prevented.

The length l of the windbreak plate 3 of the present invention is set to 1/2 to 2/3 of the length L of the drive roller 4, and the windbreak plate 3 is set to the drive roller 4.
It is preferable to provide it on the distal end side.

When attaching the windbreak plate 3, it is preferable to find the optimum angle while visually checking the effect on yarn swaying, and then fix the supporter 2 to the bracket 5. By setting the length l of the windbreak plate 3 to 1/2 to 2/3 of the length L of the drive roller 4, there are no obstacles (i.e.,
There is no windbreak plate, making it easy to adjust and fix.

In addition, even if the yarn were to wrap around the entrance side of the roller device, the length l of the windbreak plate 3 could be set to 1/2 to 2/3 of the length L of the drive roller 4. Since there is no windbreak plate on the side, the wound yarn does not come into contact with the windbreak plate, making it difficult for wind lint to occur. Moreover, by shortening the windbreak plate as described above, it becomes compact, making manufacturing, installation, etc. easy and inexpensive.

A 75 denier polyester yarn is placed between the large diameter heated drive roller 4 and the small diameter separate roller 1.
Figure 8 shows an example of yarn tension when winding 10 turns and feeding the yarn at 2500 m/min. As is clear from FIG. 8, the yarn tension decreases as the yarn is wound from the upstream side to the downstream side due to the heating effect from the heating drive roller. When the yarn is subjected to accompanying airflow in a state where the yarn tension is reduced in this way, yarn swinging occurs. However, on the upstream side, the yarn tension is sufficiently large (in the example shown in FIG. 8, it is 15 g or more for turns 1 to 3), and the yarn is tightly wound around the drive roller 4 and the separate roller 1. Even when subjected to some accompanying airflow, the yarn hardly sways. Therefore, as described above, the length l of the windbreak plate 3 may be shortened to 1/2 to 2/3 of the length L of the drive roller 4.

Although the windbreak plate 3 of this embodiment is fastened to the supporter 2 with 8 screws, it may be constructed integrally with the supporter 2.

Furthermore, Teflon resin (tetrafluoroethylene resin) is suitable as the material for the windbreak plate 3 in terms of heat resistance and flexibility, but other materials such as other synthetic resins or metals may also be used.

Further, in this embodiment, the distance between the windbreak plate 3 and the heating roller 4 is 1 mm, but in order to enhance the effect of blocking the accompanying airflow, the distance may be further reduced to about 0.1 mm.

The tip of the windbreak plate 3 positioned close to the heating roller 4 may be shaped perpendicular to the windbreak plate as shown in Fig. 1, or one side (Fig. 2) or both sides (Fig. 3) may be chamfered. Other shapes may be used, such as a V-shape with a rounded tip or an R-shape with a rounded tip (FIG. 4).

In this embodiment, the windbreak plate 3 is fixed to the machine base via the bracket 5, but the windbreak plate 3 is made swingable, so that when the yarn wraps around the heating roller 4, it swings and the heating roller 3 It may also be possible to separate it from the

In addition, a limit switch or a detector (not shown) such as a photoelectric sensor is attached to the windbreak plate 3 or the supporter 2, or a stress detector (not shown) is attached to the supporter 2, so that the yarn is wrapped around the heating roller 4. When this is detected, the yarn supplied from the spinneret to the take-off device may be mechanically cut, the spun yarn may be sucked by a yarn suction means, and then the entire drawn take-off device may be stopped. In this case, when the yarn is wound around the heating roller 4, it is preferable to swing the windbreak plate 3 manually or by an appropriate driving means to prevent damage to the windbreak plate 3.

In the above-mentioned embodiment, as shown in FIGS. 1 to 4, the windbreak plate 3 was provided so that the tip of the windbreak plate 3 was located near the yarn path leading from the heating roller 4 to the separate roller 1. However, as shown in FIG. 5, a windbreak plate 3 may be provided near the yarn path from the separate roller 1 to the heating roller 4. Furthermore,
As shown in FIG. 6, windbreak plates 3 may be provided symmetrically in the vicinity of the yarn path from the heating roller 4 to the separate roller 1 and in the vicinity of the yarn path from the separate roller 1 to the heating roller 4. The effect of preventing yarn sway due to accompanying airflow is the highest.

In the above embodiments, the large diameter drive roller was a heated roller, but the drive roller of the present invention does not necessarily need to be heated.

〔Effect of the invention〕

According to the present invention, the generation of the accompanying airflow can be reduced by locating the tip of the windbreak near the large-diameter drive roller where the accompanying airflow is likely to occur, and the other end of the windbreak can be placed between the driving roller and the separate roller. Since the windbreak plate is biased towards the center of both rollers rather than the thread path of the wound yarn, and the windbreak plate faces inward from the yarn path, the accompanying airflow stopped by the windbreak plate is a separate roller for small diameter rollers that tend to cause the yarn to sway. Make sure that it does not get sprayed on. Therefore, due to the synergistic effect of reducing the generation of accompanying airflow caused by the large-diameter drive roller and preventing the accompanying airflow from blowing onto the separate rollers, it is possible to eliminate the yarn shaking caused by the accompanying airflow of the driving roller, and the winding yarns This can prevent the threads from coming into contact with each other and from moving in the axial direction of the roller and causing friction with the roller surface. Therefore, generation of fluff and single yarn breakage can be prevented, and yarn breakage can also be prevented, improving yarn quality and productivity. Furthermore, since the thread swing can be prevented, the thread pitch can be narrowed (as an example, the conventional 5 mm
(The pitch was reduced to 3 mm instead of the pitch.) Therefore, the roller length can be shortened and the roller cost can be reduced.

Further, when the yarn feeding roller device of the present invention is used as a drawing roller, it is possible to fix the drawing point by preventing the yarn from swinging, and the quality of the obtained drawn yarn is improved. Further, since the roller length can be shortened, multi-filament drawing becomes easy.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIGS. 2 to 6 are partial front views of other embodiments, and FIG.
The figure is a schematic front view of a direct spinning drawing and take-off device implementing the device of the present invention, and FIG. 8 is a diagram showing the yarn tension on the yarn feed roller of the present invention. 1...Separate roller, 2...Supporter,
3...Windbreak plate, 4...Heating roller.

Claims (1)

[Scope of Claims] 1. A large-diameter drive roller connected to a drive motor, and a small-diameter separate roller arranged in parallel with the drive roller and rotated by a thread wound between the drive roller and the drive roller. A windbreak plate is provided between the drive roller and the separate roller to prevent the yarn from swinging due to the accompanying airflow of the drive roller, and the tip of the windbreak plate is located near the circumferential surface of the drive roller, and the other end is located near the circumferential surface of the drive roller. A yarn swing prevention device in a yarn feed roller device, characterized in that the yarn path of the yarn wound around the drive roller and the separate roller is biased toward the center of the rollers. 2. The yarn swing prevention device in a yarn feed roller device according to claim 1, wherein the windbreak plate is provided in a range of 1/2 to 2/3 from the tip side to the root side of the drive roller.