JPS6153971B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for switching and winding yarn in the manufacturing process of threads such as synthetic fibers, and particularly to a method for switching and winding yarn suitable for a turret-type continuous yarn switching and winding device.

In recent years, the processing speed of yarn has increased in the textile industry, and the processing speed of filament yarn has increased to 2500 m/min.
It has become common to exceed the In the case of such high-speed processing, operations that were previously performed smoothly without any trouble may no longer be applicable as they are. For example, in order to obtain a good wound package shape under high-speed conditions, the winding angle, contact pressure, and tension are important factors, and it is known that the winding tension has a particularly large influence. Therefore, in order to obtain a good wound package shape, it is required to wind the yarn with as low a winding tension as possible. However, when the automatic winder switches the yarn under such low tension conditions, yarn sagging occurs momentarily between the final stage yarn feed roller and the winder, causing the running yarn to There is a tendency for the thread to become wrapped around the rollers and cause the thread switching to fail, which has become a serious problem.

When thread switching is performed manually, even if the thread switching fails due to the reasons mentioned above, there is a worker who can immediately rethread the thread, so the problem is not as serious. There isn't. However, when switching the yarn using the automatic winder as described above, it is virtually impossible to re-thread the yarn. Therefore, it is absolutely necessary to maintain a high first thread switching success rate.

The present invention has been made to meet such demands. That is, the present invention, when switching the spun yarn supplied from upstream via the yarn feed roller using a tarratt type automatic winding device, changes the traveling yarn guide of the yarn before switching the yarn. The yarn is run through a grooved section of the yarn feeding roller that has a large number of grooves in the axial direction formed in a certain area, and after yarn switching is completed, the yarn is transferred from the grooved section of the yarn feeding roller to the adjacent smooth section. This is a thread switching method for an automatic winding machine, which is characterized by the following.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. In FIG. 1, the yarn Y is spun from a spinneret (not shown), passes through a yarn feed roller 1, further passes through a traversing fulcrum guide 2, and is then spun onto an automatic winder 3 installed below the traversing guide 2. It is rolled up.

The automatic winding machine used in the present invention is a commonly used turret type winder, and the details of its mechanism will be omitted. has a turret plate 4 and two winding bobbins 5, 5' which are rotatably supported by the turret plate 4 and rotated by a drive device (not shown). A traverse device 6 for traversing the yarn Y is provided above the turret type winder 3. 7 is a guide for traverse. Further, above the yarn feed roller 1, a guide 8 for changing the running direction of the yarn Y and a reciprocating cylinder 9 for moving the guide 8 are provided.

Next, the yarn feed roller used in the present invention will be explained. In FIGS. 2 and 3, 11 is the main body of the yarn processing roller, and as shown in FIG. A collar 15 is provided at the rear end, and a large number of narrow grooves 1 are provided at the front end of the roller shell 12 in the axial direction.
6 are provided alternately around the entire circumference, and the other surfaces are made smooth.

As shown in FIG. 3, this groove 16 is formed in a smooth wave-like uneven shape so that the outermost peripheral portion does not have an adverse effect on the processed yarn. Although the groove 16 is shown as being provided at the front end of the roller, it may be provided at any position such as the rear end or the middle depending on the winding or threading conditions. In addition, when providing a groove at the front end of the roller, it is preferable to leave the front end of the roller smooth over a length of several millimeters. It is also possible to prevent dangerous situations that can easily occur.

Next, a yarn switching method for an automatic winding machine according to the present invention will be specifically explained. When the package being wound onto the bobbin 5 is completely wound, the reciprocating cylinder 9 that carries out yarn guiding movement receives a complete winding signal from the automatic winding machine 3, and the yarn guiding change guide 8 is activated. It moves to the right in FIG. 1, and moves the yarn guide of the running yarn Y to the position indicated by the two-dot chain line.
That is, the running yarn is moved from the smooth portion of the yarn feed roller 1 to the groove portion 16. Groove portion 16 of yarn feed roller 1
Under the condition in which the winding is being carried out, the running yarn Y is switched from the bobbin 5 being wound to the empty winding bobbin 5'.

When the switching is completed, the reciprocating cylinder 9 that performs the yarn guiding movement described above is made inactive, and the yarn guiding of the running yarn Y is moved again to the position shown by the solid line in FIG.
The running yarn is moved from the groove portion 16 of the yarn feed roller 1 to the smooth portion. In this case, the yarn guide of the running yarn Y is transferred to the groove 16 of the yarn feed roller 1 immediately before the yarn switching of the automatic winding machine, so that the yarn feeding caused by the decrease in tension at the time of yarn switching, which has been a problem in the past, is avoided. Thread sagging of the roller 1 does not substantially occur.

That is, since the yarn is processed in the groove 16 on the roller, the phenomenon of instantaneous tension drop that causes yarn sagging is directly transmitted to the upstream side of the yarn feed roller 1. In other words, since the surface of the processing roller is grooved, the adhesion force of the yarn to the roller 1 is extremely small, and the yarn sag is directly propagated upstream and is no longer wrapped around the roller 1.

In addition, problems with yarn quality caused by processing running yarn in the groove portion 16 at the time of yarn switching can be reduced to a substantially non-problematic level by optimizing the groove shape.

As described above, according to the present invention, there is no problem that the yarn sag and wrap around the processing roller when switching the yarn of an automatic winding machine, and the success rate of yarn switching can be significantly increased. In addition, since the running yarn Y is immediately transferred from the groove to the adjacent smooth part after the yarn change, defective yarns such as single yarn breaks are not wound up, and from the time the yarn change is completed until the winding is complete. There is no need to worry about defective yarn being mixed in between the threads, and the use of an automatic winder can fully demonstrate the labor-saving effect while also ensuring quality, which has an extremely large effect. .

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of a device showing an embodiment of the thread switching method according to the present invention. FIGS. 2 and 3 are cross-sectional views of the grooved roller used in the present invention. 1... Yarn feed roller, 3... Turret type winder, 8... Guide, 9... Reciprocating cylinder, 16
……groove.

Claims (1)

[Claims] 1. When switching the spun yarn supplied from upstream via the yarn feed roller using a turret type automatic winding device, the running yarn guide of the yarn is changed prior to the yarn switching to change the yarn to a yarn. The yarn is caused to run through a grooved portion having a large number of grooves in the axial direction formed in a certain area of the feed roller, and after yarn switching is completed, the yarn is transferred from the grooved portion of the yarn feed roller to an adjacent smooth portion. Thread switching method for automatic winding machine.