JPS6214461B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for detecting movement of a single yarn in high-speed yarn winding.

In recent years, in order to increase productivity, high-speed spinning and winding techniques for multi-filament yarns, such as direct spinning, drawing and winding of multi-filament yarns and highly oriented undrawn yarn take-up, have been studied.

The biggest problem in such multi-filament, high-speed yarn winding is yarn sway on the drawing roller (usually a Nelson roller is used in direct spinning and drawing). In other words, since the yarn is wound at a high speed of 2,000 m/min or more (currently up to about 8,000 m/min), the pair of drawing rollers (second Godet rollers) made of Nelson rollers are particularly prone to the accompanying airflow that is inherent to high-speed rotation. This causes severe yarn sway, and in the case of multi-filament yarns, the pitch between each yarn is narrow, so the effects of yarn sway - single yarn movement and single yarn breakage - are more pronounced.

When single yarn movement or single yarn breakage occurs due to yarn swinging, the quality of the wound raw yarn (to become a product) deteriorates. In particular, in raw yarn for tricots, it appears as vertical stripes and stripes, and in raw yarn for textiles, it appears as horizontal row unevenness, both of which result in defects.

The inventors of the present invention have found that the cause of the above-mentioned defects is the yarn swaying on the drawing roller, and furthermore, the location where single yarn movement is most likely to occur due to the yarn swaying is the yarn on the drawing roller. The present invention was achieved by discovering that it is between the separation point and the exit guide.

In other words, the purpose of the present invention is to quickly detect single yarn movement caused by yarn swaying that is typical of multi-filament yarns and high-speed yarn winding, to prevent defects from occurring at that point, and to improve the quality of product raw yarn. An object of the present invention is to provide a single yarn movement detection method that can be improved.

In order to achieve this object, the present invention provides a yarn path sensor between the yarn separation point of the drawing roller and the exit guide in multi-filament, high-speed yarn winding where the take-up and winding speed is 2000 m/min or more. Of the multifilament yarns that are set up and run while maintaining distance from each other,
If one or more filaments constituting each yarn move between adjacent yarns, the yarn path sensor detects this and generates an alarm. be.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 1 is a front view of the direct spinning/drawing device (part) equipped with a yarn path sensor, and Figure 2 is the same as in Figure 1.
A sectional view taken in the direction of arrows and FIG. 3 are perspective views for explaining the operation of the yarn path sensor.

In FIG. 1, multifilament multi-filament threads Y (four threads Y1 to Y4 in the example) are spun from spindle 1 and cooled and solidified through cooling chimney 2.
After being oiled by the oiling roller 3 and taken over by the Godet rollers 5, 5' (made of Nelson rollers) via the direction change guide 4, it is stretched and stretched by the stretching hot rollers 6, 6' (made of Nelson rollers). It is heat treated and wound up as a package via an exit guide 9 in a winder (not shown). 7 is a heat insulation cover.

In FIG. 2, 7' is the openable/closeable lid of the heat insulation cover 7, and 8 and 8' are the stretching hot rollers 6,
6' are each drive motors.

What is important here is that the yarn path sensor 10 is provided between the yarn separation point P of the drawing hot roller 6' and the exit guide 9.

In other words, the yarn tension is usually lower on the yarn winding side than on the yarn supply side, and since the tension fluctuates due to the traverse for winding, the yarn path is likely to fluctuate. More yarn swing occurs on the winding side than on the winding side. In particular, when the speed is increased and the number of yarns is increased, the yarn sway on the winding side becomes more noticeable.

Based on this knowledge, the inventors of the present invention conducted extensive studies, and as a result of the above-mentioned stretching (hot)
When the yarn path sensor 10 is provided between the yarn separation point P of the roller 6' and the exit guide 9 located on the winding side, movement of a single yarn can be detected most reliably. It was discovered that the occurrence of defects can be most effectively prevented, and the present invention was developed.

In the apparatus of the above embodiment, in order to eliminate steps and increase productivity, drawing hot rollers 6 and 6' were used which perform drawing and heat treatment at the same time.
The heat treatment may be performed later. In short,
The yarn path sensor 10 may be provided between the yarn separation point P of the stretching roller 6' and the exit guide 9 to quickly and reliably detect movement of a single yarn.

The operation of the yarn path sensor 10 will be explained using FIG. 3.

Thread path sensor 1 consisting of an embodiment shown in FIG.
0 uses a photoelectric element. That is, the holder H, which is formed in a substantially U-shape, has light projecting parts L1 to L3 on one inner side of the opposite sides, and has light receiving parts R1 to R3 at corresponding positions on the other side. In addition, in the embodiment, three pairs of light emitting/receiving sections L1, R1 to L3, and R3 are provided for four yarns, but generally when running n yarns (n≧2, integer) in parallel, (n -1) It is sufficient to provide a pair of light emitting and light receiving sections.

Now, suppose that the four yarns Y1 to Y4 are running between the yarn separation point P and the exit guide 9 as shown in FIG. The yarn path sensor 10 is installed at a position. Therefore, in a normal running state in which no single yarn movement occurs, each light beam does not intersect with each yarn, and each of the light receiving sections R1 to R3 receives the maximum amount of light.

However, due to the accompanying airflow of the drawing (hot) roller 6' rotating at high speed, the yarn sways violently, causing the yarns to sway between adjacent yarns (Y1 and Y2, Y2 and Y2).
3, one or more filaments among the multifilaments constituting each yarn moved somewhere between Y3 and Y4). That is, when a single yarn (filament) moves, it is immediately detected by the yarn path sensor 10 as a decrease in the amount of light received, and an alarm is generated by a known warning means (not shown).

As a result, two yarns Yi, Yi+
Regarding No. 1, winding can be interrupted at that point to prevent the occurrence of defective rolls. Note that for the yarns (other than Yi, Yi+1) where single yarn movement has not occurred, winding may continue as is, or winding may be continued in the same way as for the two yarns (Yi, Yi+1) where single yarn movement has occurred. You may interrupt the session.

In the above embodiment, a combination of photoelectric elements was used as the thread path sensor 10, but if even higher precision is required, an integrated circuit chip formed by densely arranging semiconductors such as photodiodes may be used. Sensors can also be used.

As explained above, since the present invention has the above configuration, it is possible to quickly and reliably detect single yarn movement caused by yarn shaking that is typical of high-speed yarn winding with multiple yarns of 2000 m/min or more. Therefore, it is possible to prevent the occurrence of defective fabrics, thereby improving the quality of the product yarn.

[Brief explanation of the drawing]

Figure 1 is a front view of the direct spinning/drawing device (part) equipped with a yarn path sensor, and Figure 2 is the same as in Figure 1.
A sectional view taken in the direction of arrows and FIG. 3 are perspective views for explaining the operation of the yarn path sensor. 6, 6'... Stretching (hot) roller, 9... Exit guide, 10... Yarn path sensor, P... Yarn separation point.

Claims (1)

[Claims] 1. In multi-filament/high-speed yarn winding where the take-up/winding speed is 2000 m/min or more, a yarn path sensor is installed between the yarn separation point of the drawing roller and the exit guide, and If one or more filaments constituting each of the filament yarns moves between adjacent yarns, the yarn path sensor detects the movement and generates an alarm. A method for detecting single yarn movement in high-speed yarn winding.