JPS5818304B2 - Thread switching method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a yarn switching method in a revolving type winder.

In recent years, the spinning speed of synthetic fibers has been gradually increasing, but the key issue in this spinning process is how to make the thread winding process continuous.

In a general continuous winding method, two winders are installed for one spinning machine, and the bobbins are alternately switched and wound.

However, in this winding method, the thread switching operation is complicated and it is difficult to switch automatically, and the equipment cost increases and a large installation area is required. This is a problem in facility construction.

As mentioned above, there are various problems with the method of installing two winders in parallel and winding continuously, but in order to solve these problems, a method using a revolving type winder has been studied. There is.

A revolving type winder has multiple spindles supported on a revolving shaft, and when the winding bobbin is full, the revolving shaft is rotated to transfer yarn from the full bobbin to the empty bobbin. be.

This winding machine has the characteristic that it is easy to change the yarn continuously compared to other winding machines, but the yarn speed is only 3000.
m/min or higher, there is a problem in that the success rate of thread switching decreases significantly.

As a means for holding the yarn end on the bobbin, a narrow groove is cut into the surface of the bobbin, a small piece of a fastener with hook-shaped bristles is attached, or in some cases, an adhesive tape is attached.

This yarn gripping means has a high success rate when the yarn speed is lower than the above value, but as the speed increases, there is a problem in that the yarn skips over the yarn gripping means.

In particular, in the case of a narrow groove (blade cut), the yarn does not fall into the groove, which has the disadvantage that the operator must monitor when changing the yarn.

As a result of studying the causes of the drawbacks of the prior art, the present inventor found that there is a close relationship between yarn tension and the success rate of yarn switching, and that when the yarn tension is high, the success rate is relatively high. found.

The present invention was obtained based on the above findings, and
It is characterized by the use of rollers configured to temporarily increase tension when switching threads.

Specifically, a roller that rotates in contact with the bobbin is formed with sections with different circumferential speeds, and when switching threads, the thread is guided to this section where the circumferential speed is slow, and while this state is maintained, the thread is transferred to the thread gripping section. It is characterized by being configured to capture and stir threads, automatically switch threads, and increase the success rate of thread switching.

The present invention will be described in detail below with reference to the drawings, but the present invention is not limited thereto, and details may be changed within the scope of the technical idea.

. FIG. 1 is a perspective view showing the relationship between a rotating roller and a bobbin for carrying out the present invention.

In FIG. 1, W indicates the traverse width of the yarn traversing the roller L, and T indicates the yarn shifting position at the time of yarn switching.

Reference numeral 1 denotes a bobbin that is fitted onto a spindle and driven. A thread gripping part 2 is provided on the surface of the end of this bobbin 1, and a thread gripping part 2 is provided on the surface of the end of this bobbin 1 so that a touch roller 3 can be rotated by contacting this bobbin 1. A groove-shaped small diameter portion 4 is provided at a position corresponding to the thread gripping portion 2.

FIG. 2 shows another structure of the roller 3'.
A small diameter portion 4' is formed at a position facing the thread gripping portion 2' of the bobbin 1 and the portion where the package is formed.

FIG. 3 is a side view showing an example of a revolving type winder, and FIG. 4 is a front view.

10. 11 is a spindle, 12 is a revolving arm that supports the spindle, 13 and 14 are motors that drive the spindles io and ii, 15 is a device that drives the revolving spindle that supports the revolving arm 12, 16 is a main body, Above this is the traverse device 17
is provided.

This traverse device 17 is provided with a touch roller 3 that rotates in contact with the bobbin or package.
A small diameter portion 4 is formed at the end of the touch roller, avoiding the portion that contacts the package.

(This embodiment shows a winding machine equipped with two traverse devices, and two packages are formed on the spindle 10.

Therefore, two small diameter portions 4 are formed at both ends of the touch roller 3.) Next, the yarn switching method of the present invention will be explained using the revolving type winder.

As shown in FIGS. 3 and 4, when the package P reaches a predetermined winding diameter, a switching signal is issued from the control device, and the first drive device 15 is driven once to rotate the revolving arm 12 in the direction of arrow A. .

During this thread switching operation, the spindle 10 continues to be driven, so the thread Y is wound around the five package P as it is.

When the revolving arm 12 rotates 180 degrees, the bobbin fitted on the spindle 11 contacts the roller 3 and is driven once.

At this time, the yarn Y is guided to the small diameter portion 4 by a yarn guide (not shown).

The circumferential speed of the small diameter portion 4 decreases in proportion to the outer diameter of the roller 3.

The yarn Y that comes into contact with the small diameter portion 4 is taken off at a normal speed, so that the frictional force at the small diameter roll portion increases, and the tension increases accordingly.

Therefore, the yarn Y is pressed against the surface of a new bobbin to which the yarn is to be switched, and is securely gripped by the yarn gripping section.

FIG. 2 shows a touch roller 3' that includes a traverse and a thread handling position and forms a small diameter section 4', and the operation of the small diameter section 4' in this case is exactly the same as in the case of FIG. However, the ratio of the diameter of the small diameter part of the touch roller to the diameter of the other part is approximately 99:100, and if this ratio is made too large, it may have an adverse effect on the yarn quality and should be avoided.

In addition, in the example, a spindle and drive type winding machine was shown, so a driven roller was shown as a touch roller.
Needless to say, in a surface 1 drive type winding machine, the touch roller becomes a drive roller.

As described above, the present invention is characterized in that a small diameter portion is formed in the portion of the roller corresponding to the thread shifting position during thread switching.
For this purpose, the following effects are achieved.

(a) The thread guided to the thread gripping part of the bobbin is guided to the small diameter part of the roller that contacts the bobbin or the package, so the thread tension increases due to the frictional effect of this part.
The yarn is strongly pressed against the yarn gripping portion, and as a result, the success rate of yarn switching is significantly improved.

In the case of a conventional device using rollers of the same diameter, the thread switching success rate is around 90%, but in the present invention, it is close to 100%. As shown in FIG. 1, the device used in the present invention has an extremely simple structure, and the present invention can be carried out by only making some changes to the conventional device.

[Brief explanation of the drawing]

1 and 2 are perspective views showing the relationship between a touch roller and a bobbin for carrying out the present invention, and FIGS.
The figures are a side view and a front view of a revolving winder for implementing the present invention. 1... Bobbin, 2, 2'... Thread gripping section, 3, 3'... Touch roller, 4, 4'...
... Small diameter part, 10, 11 ... Spindle, 1
2... Revolving arm, 13.14...
... Motor, 15 ... Revolving spindle drive device, 16 ... Main body, 17 ...
・Traverse device.

Claims (1)

[Claims] 1 A revolving arm supports a plurality of spindles, and from a bobbin in a bobbin winding area fitted to the spindles,
In the method of switching the thread to the empty bobbin fitted to the next spindle, when the running thread is polluted by the thread gripping part of the rotating empty bobbin, the thread is rotated corresponding to the empty bobbin. The feature is that the thread is threaded by running it on a roller that is holding the thread at a circumferential speed that is slower than the circumferential speed of the thread gripping part of the empty bobbin on which the thread is hooked, and after the thread is switched, normal winding is performed. Thread switching method.