JPH1095568A - Thread unwinding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To longitudinally untie a thread from a coiled thread body of elastic thread like rubber in which the thread can not be smoothly released by a conventional method, by untying the thread while applying micro vibrations to the coiled thread body. SOLUTION: When a thread Y is untied from a coiled thread body 4 formed by coiling the thread, micro vibrations are applied to a frame 3 by a vibrator fixed to the frame 3 and the coiled thread body 4 is vibrated by the micro vibrations transmitted via a creel peg 2 and the thread Y untied from the coiled thread body 4 is also vibrated on the coiled thread body 4. Therefore, when the thread Y in the back side of the coiled thread body 4 is untied, contact friction between it and the thread coiled in the front side is reduced to easily untie the thread Y without large variations in tension.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for unwinding a yarn from a wound body, and more particularly to a method for unwinding a yarn from a wound body made of elastic yarn.

[0002]

2. Description of the Related Art To wind a thread in a cylindrical, conical or spindle shape, unwind the thread from the wound thread, and supply the thread to the next processing step, leave the wound thread stationary. It is generally performed to pull out the yarn in the extending direction of the central axis of the cylinder or frustum formed by the winding shape of the winding portion of the yarn, and in this case, it is generally called "vertical unwinding". It is said. It is also common to unwind the yarn in a direction perpendicular to the central axis while rotating the wound body about its central axis. In this case, it is generally called "horizontal unwinding". .

Further, a detailed description will be given of a conventional method of unwinding a yarn from a wound body. As a method of unwinding a technique, the following method is known.

[0004] That is, a winding method in which the wound body is allowed to stand still and the yarn is drawn out in the axial direction (over-end unwinding / longitudinal unwinding). A method of unwinding in which the yarn is drawn out vertically and in the tangential direction of the wound body (rolling unwinding / horizontal unwinding) An unwinding method of rotating the wound body in order to prevent unwinding twist (Japanese Utility Model No. 39) No. 35909, Kosho 4
Japanese Unexamined Patent Publication No. 0-11654, Japanese Utility Model Publication No. 41-8414) An unwinding method of rotating a wound body about an axis, pulling out a yarn in an axial direction, twisting the yarn, and unwinding the yarn. No.

[0005] In the above unwinding method, the horizontal unwinding is generally performed in a rubber-like elastic yarn represented by spandex, and in some rubber-like elastic yarns, a vertical unwinding is also used. This is the unwinding method used. However, the longitudinal unwinding easily expands and contracts due to a slight change in tension due to the inherent properties of the rubber-like elastic yarn, which often makes it difficult to unwind the yarn smoothly.

Another disadvantage of the horizontal unwinding is that when all the yarns forming the wound body are unwound, the supply of the yarns is interrupted once, and the process is stopped at this point. Then, the next winding body must be set up and restarted.

On the other hand, in the vertical unwinding, a tail thread (transfer tail) can be provided at the beginning of the winding of the wound body, and the next thread can be connected in advance. Therefore, even if all the yarns of the preceding winding body are unwound, the supply of the yarn continues without interruption from the succeeding winding body by the transfer tail immediately, so that there is no need to stop the process. There is. Further, in the unwinding method using the longitudinal unwinding, a failure in unwinding property occurs due to contact with the winding portion generated when the yarn is unwound, which causes a yarn breakage, a tension variation, and the like. Have the disadvantages of
It is not usually done on a production scale.

As described above, since the rubber-like elastic yarn cannot be unwound substantially in the longitudinal direction as described above, the yarn must be supplied in the unwound state. Since it was forced, improvement was desired.

[0009]

That is, an object of the present invention is to provide a longitudinal unwinding of a wound body such as a rubber-like elastic yarn which cannot be smoothly unwound by a normal unwinding method. It is an object of the present invention to provide a method for unwinding a yarn that has been made possible.

[0010]

The present inventors have made intensive efforts to solve these problems by the method described below.

That is, according to the present invention, in a method of unwinding a yarn from a wound body formed by winding the yarn around a bobbin in a direction in which a central axis of the wound body extends. A yarn unwinding method characterized by unwinding a yarn from a wound body while applying a slight vibration to the yarn body.

Here, the effect of the method of the present invention is maximized when the elastic yarn is unwound from a wound body formed by the elastic yarn.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a front view for explaining the unwinding method of the present invention. In the figure, reference numeral 1 denotes a creel device. here,
The creel device 1 is composed of a creel peg 2 for supporting an individual wound body 4 and a frame 3 for fixing the creel peg 2, and the frame 3 is provided with a yarn wound on a bobbin 12. A vibrator device 9 for applying micro-vibration to the formed winding body 4 during unwinding is attached. Reference numeral 5 denotes a take-out guide for taking out the yarn Y from the wound body 4.

In FIG. 1, the unwound yarn Y is taken off by the take-up roller 7 and the nip roller 8 via the intermediate guide 6, and is thereby continuously unwound from the wound body 4. It is then transported to the next step. Further, a tension measuring device 10 and a recorder 11 are provided to measure the unwinding tension of the yarn Y unwound between the intermediate guide 6 and the take-up roller 7 and the nip roller 8. The change in tension of the unwound yarn Y was recorded.

FIG. 2 shows the unwinding tension measured when the yarn Y was unwound from the wound body 4 in the state where the vibrator device 9 was not attached to the creel device 1 using the recorder 11. It is a tension fluctuation chart. FIG. 3 is a tension variation chart showing the time lapse of the unwinding tension of the yarn in a state where the vibrator device 9 is positively attached to the creel device 1.

As described above, in the present invention,
When the yarn Y is unwound from the winding body 4 formed by winding the yarn on the bobbin 12, the frame 3 is given a slight vibration by the vibrator device 9 attached to the frame 3. Then, along with this, the fine vibration propagated through the creel peg 2 causes the wound body 4 to vibrate. Therefore, the yarn Y unwound from the wound body 4 also slightly vibrates on the wound body 4. For this reason, the winding body 4
When the yarn Y on the back side (the winding position of the yarn as viewed from the take-out guide 5) is unwound, the yarn Y is moved forward (the winding position of the yarn as viewed from the take-out guide 5). The contact friction with the wound yarn is reduced. If the yarn Y unwound from the wound yarn body 4 does not cause slight vibration, it goes without saying that the contact friction with the yarn wound forward is increased.

The above-described increase and decrease in the contact friction appears as the magnitude of the fluctuation width of the unwinding tension, and clearly appears in the charts of FIG. 2 and FIG. In other words, in the case of FIG. 2 in which the contact friction increases, the unwound yarn Y causes a stick-slip on the outer periphery of the wound thread body 4, which causes a large fluctuation in tension. On the other hand, in the method of the present invention, since the contact friction is reduced, the yarn Y is easily unwound without a large fluctuation in tension.

The above-described unwinding method has an effect regardless of the type of yarn constituting the wound body 4. For this reason, the yarn forming the wound body is not particularly limited, but it goes without saying that this method is most effective for elastic yarn that easily expands and contracts even with a slight change in tension.

[0019]

As described above, according to the present invention, the vibrator device 9 fixed to the frame 3 of the creel device 1 when unwinding the wound body 4 having the yarn wound on the bobbin. The micro-vibration generated by the creel device 1
From the creel peg 2 to the wound body 4 and the unwinding yarn Y from the frame 3. For this reason, the Y yarn continuously unwound does not slide and stick-slip with the winding yarn wound on the surface of the winding body 4 and is unwound in the air floating state. Abnormality of unwinding tension, which has been a problem in the past, does not occur, and smooth continuous unwinding is always performed. In addition, in particular, an extremely remarkable effect is obtained in that the longitudinal unwinding of the elastic yarn, which has not been conventionally performed as a productive method, is enabled.

[Brief description of the drawings]

FIG. 1 is a schematic front view illustrating a method for unwinding a wound body of the present invention.

FIG. 2 is a chart showing the lapse of time of unwinding tension when normal unwinding is performed in the longitudinal unwinding of a wound body.

FIG. 3 is a chart showing a lapse of time when unwinding a wound body according to the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Creel apparatus 2 Creel peg 3 Frame 4 Winding body 9 Vibrator apparatus 10 Tension measuring device Y Unwinding thread

Claims (2)

[Claims] 1. A method for unwinding a yarn from a wound body formed by winding a yarn on a bobbin in a direction in which a center axis of the wound body extends, wherein minute vibration is applied to the wound yarn. While giving
A method for unwinding a yarn, comprising unwinding the yarn from a wound body. 2. The yarn unwinding method according to claim 1, wherein the elastic yarn is unwound from a wound body formed by the elastic yarn.