JP2002046938A - Yarn winding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a yarn winding method capable of obtaining a superior package shape and superior process passableness in an additional work process. SOLUTION: A rotating speed of a spindle 8 at yarn winding time is detected, and a rotating speed of a traverse motor is controlled so that the winding ratio W calculated from a spindle speed and a winding shaft directional moving speed of a traverse chip 3 becomes a preset value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method of winding a synthetic fiber yarn, particularly a synthetic fiber yarn having a large fineness, and more particularly, to a method of winding a synthetic fiber yarn having a good package shape and a good shape. The present invention relates to a yarn winding method capable of obtaining a good processability in a post-processing step such as unwinding property.

[0002]

2. Description of the Related Art Generally, in the process of winding a yarn,
When the wind ratio W calculated from the spindle speed and the moving speed of the traverse tip in the winding axis direction becomes an integer of a certain value shown as a representative value, for example, the yarns wound on the package overlap through the same place. A ribbon is generated, and this ribbon induces vibration of the contact roller to cause a thread drop, and causes a problem that a thread that overlaps is unwound as a bundle when the thread is unwound from the package. .

A traverse device (hereinafter referred to as a cam traverse device) that reciprocates a traverse tip on the groove in a winding axis direction by rotating a groove cam having an endless spiral groove formed by a traverse motor. ) And a spindle device for rotating a spindle with a bobbin mounted thereon by a spindle motor. In the case of using a high-speed winding machine that forms a winding package on a bobbin while traversing a synthetic fiber yarn, the ribbon In order to avoid the occurrence of the traverse reciprocating speed, a control method of vibratingly changing the traverse reciprocating speed from a preset constant value and a control method of greatly changing the traverse reciprocating speed in the ribbon generating region have been adopted.

However, in the above-described control method, especially when using a winding machine that winds a synthetic fiber yarn having a thick line at a high speed, the winding of the package is fast and the ribbon area generated per unit time is reduced. Since the number of times is large, if the method of changing the traverse reciprocating speed greatly for the purpose of avoiding the ribbon is adopted, the variation of the traverse reciprocating speed per unit time must be large.

However, if the variation of the traverse reciprocating speed per unit time is increased, the change in the winding width of the package cannot be ignored, and an annual ring-shaped pattern centering on the bobbin axis is generated on the package end face. In the case where such an annual ring-shaped pattern is extremely generated, a thread drop may occur, and the yarn may be loosened at the time of unwinding, and the yarn sending tension may change. In addition to the problem of the passage property, there have been problems such as unfavorable quality in the package form.

[0006]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of studying to solve the problems in the prior art described above.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a yarn winding method comprising winding a synthetic fiber yarn having a particularly large fineness into a package while traversing the yarn by a cam traverse device. It is an object of the present invention to provide a yarn winding method capable of obtaining a good process passability in a post-processing step such as a property.

[0008]

In order to solve the above-mentioned problems, a yarn winding method according to the present invention is characterized in that a groove cam having an endless spiral groove formed thereon is driven to rotate by a traverse motor. It has a traverse device for reciprocating the traverse chip on the groove in the winding axis direction, a spindle device for rotating a spindle equipped with a bobbin by a spindle motor, and a control device for controlling the traverse motor and the rotation speed of the spindle motor. In a method of winding a yarn using a yarn winding device, a winding speed calculated from a spindle speed and a moving speed of a traverse tip in a winding axis direction is detected during the winding of the yarn. The rotation speed of the traverse motor is controlled so that the ratio W becomes a preset value.

In the yarn winding method of the present invention,
The following conditions (1) to (3) are preferable conditions, and when these conditions are satisfied, more excellent effects can be expected. (1) The rotation speed of the traverse motor
To vibrate from a fixed value set in advance for a fixed time from the start of bobbin winding. (2) The winding ratio W is determined by the number of leads indicated by the number of end positions at which the yarn turns are folded during one round of the package by reciprocating the traverse, and the yarn for one round of the package is wound around the package. The number of ribbons indicated by the number of intersections where a straight line drawn in parallel with the package axis between both widths of the package with respect to the yarn stitches generated by the thread crossing, and the number of the leads, While the winding is performed so as to produce the yarn folding position, the final folding position is set in advance from the amount of deviation indicated by the angle deviated in the winding direction with respect to the first folding position. (3) The control device can set the wind ratio to three decimal places.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a yarn winding method according to the present invention will be specifically described with reference to the drawings. FIG. 1 is a schematic front view illustrating an example of a yarn winding device provided with a cam traverse device used in the method of the present invention, and FIG. 2 is a diagram illustrating an embodiment of the present invention. FIG. 3 is a schematic perspective view showing one embodiment of a package wound by a control method for controlling the traverse reciprocating speed so that the wind ratio becomes a predetermined constant value. (A), the number of ribbons is shown in (b), and the shift amount is shown in (c). FIG. 4 is a diagram showing a method of determining a set time when winding by a method of vibratingly changing the traverse speed from a preset constant value until a preset time elapses from the completion of the yarn switching according to the present invention. FIG. 5 is a schematic diagram showing an example of a control loop of the traverse control method in the method of the present invention.

As shown in FIG. 1, in a yarn winding device used in the method of the present invention, a groove cam 2 having an endless spiral groove 1 is rotationally driven by a traverse motor (not shown). Accordingly, a cam traverse device for reciprocating the traverse tip 3 on the groove 1 along the traverse guide 5 in the winding axis direction, and a spindle 8 on which the bobbin 7 is mounted are rotationally driven by a spindle motor (not shown). And a control device (not shown) for controlling the rotation speed of the traverse motor and the spindle motor.
Is set to be wound as a yarn package 6.

When the yarn winding method of the present invention is performed, the traverse reciprocating speed and the spindle rotation speed are controlled by a control device as shown in the time diagram of FIG.

That is, the rotational speed of the spindle during the winding of the yarn is normally detected, and the wind ratio W calculated from the spindle speed and the moving speed of the traverse tip in the winding axis direction becomes a predetermined value. Then, the rotation speed of the traverse motor is generally controlled at substantially the same time. That is, when the yarn is traversed by the cam traverse device and the yarn is wound around the bobbin to form a package, the traverse reciprocating speed is vibrated from a predetermined constant value from the time when the yarn switching is completed to a predetermined time. Then, the traverse reciprocating speed is controlled so that the wind ratio W becomes a predetermined constant value until the winding is completed.

The variation width when the traverse reciprocating speed is vibrated is also set to a predetermined constant value.

In winding the yarn, the preset wind ratio W is determined as follows.

First, as shown in the schematic view of the package in FIG. 3 (a), the number of ends (black spots) at the end where the yarn thread turns back during one round of the package due to reciprocation of the traverse is defined as the number of leads. As shown in the schematic view of the package in FIG. 3 (b), the yarn of one round of the package is wound around the package, and the yarn is parallel to the package axis between both widths of the package. Is the number of ribbons where the straight line drawn in (1) intersects the yarn thread).

Further, as shown in the schematic view of the package in FIG. 3C, while the yarn is wound so that the number of turns is equal to the number of leads, the first folded position is shifted with respect to the first folded position. The angle at which the last turning position is shifted in the winding direction is defined as a shift amount, and is expressed as a ratio with respect to 360 degrees.

Assuming that the number of leads is J, the number of ribbons is N, and the amount of deviation is ε, the wind ratio W can be expressed by the following equation.

W = N / J + ε / J In the above equation, for example, J = 7, N = 76, ε = 445 ×
Assuming 10-5, the wind ratio W is 10.857. The shift amount ε is a small value of 0.01 or less as in this example. The above-described determination of the wind ratio W is performed by trially winding the yarn into a package at a wind ratio calculated from a number of leads, the number of ribbons, and a shift amount, and determining an optimum wind ratio from the package shape and unwinding property. In particular, the number of leads and the number of ribbons are determined from the package shape, and the amount of deviation with respect to the number of leads and the number of ribbons is set to several values. The winding ratio W is calculated based on the result of trial winding the yarn into a package at the calculated winding ratio W.
Should be determined.

In the present invention, it is preferable to wind the traverse reciprocating speed from a predetermined constant value until the predetermined time elapses from the completion of the yarn switching.

That is, when the yarn is wound on the package at a constant speed, the spindle rotation speed decreases as the winding diameter of the package increases. In order to control the traverse reciprocating speed so that the traverse reciprocating speed becomes a set constant value, the traverse reciprocating speed immediately after the completion of the yarn switching becomes large, and the traverse tip of the cam traverse device is worn by the high-speed reciprocating motion and is received every time the traverse tip passes through the folded portion. There is a problem that the traverse tip is damaged early due to fatigue due to impact force.

Accordingly, winding is performed by a method in which the traverse reciprocating speed is changed from a preset constant value in a vibrating manner until a preset time elapses from the time when the yarn switching is completed, and thereafter, the wind ratio is preset until the full winding. It is desirable to take a method of controlling the traverse reciprocating speed so as to be a constant value.

The determination of the set time is performed as follows. That is, as shown in FIG. 4, when the package is wound at a winding speed at which the winding is actually performed, a time diagram of the spindle rotation speed as the package diameter increases becomes roughly determined. Next, a time diagram of the traverse speed when the traverse speed is controlled so that the wind ratio becomes a predetermined constant value from the start of winding immediately after the completion of the yarn switching, and the following equation from the time diagram of the spindle rotation speed: Approximately calculated using

Ntr = Nsp / W (where Ntr is the traverse reciprocating speed (cp.
m), Nsp indicates the spindle rotation speed (rpm), and W indicates the wind ratio. This set time may be determined from the reciprocating limit speed due to wear or repetitive stress due to the high-speed movement of the cam traverse device and the intersection of the time diagram of the traverse reciprocating speed.

Next, the above control by the control device will be described with reference to the schematic diagram of the control loop shown in FIG.

That is, in order to carry out the control method of the present invention, a control device capable of setting the wind ratio W to three digits after the decimal point and a feedback control so that the traverse motor rotational speed is set to a preset wind ratio. In addition, a motor speed detector for detecting the actual spindle motor rotation speed and traverse motor rotation speed is required for each spindle motor and traverse motor. Then, the feedback control device needs to be able to set the wind ratio W to three decimal places, as in the example of the wind ratio 10.857 described above.

From the completion of the thread switching to the elapse of a preset time, the traverse reciprocating speed is oscillated from a preset constant value in a manner of vibrating.
The controller has a disturb function that changes the traverse reciprocating speed from a constant value in a vibrating manner, and this control method is used immediately after the completion of thread switching until the set time, and after the set time, the wind ratio is kept constant. It is necessary to have a function to switch the control method so as to perform the control.

In the above control method, by setting the wind ratio W to an appropriate value, even when the winding of the package is fast and the number of ribbon regions generated per unit time is large, the generation of the ribbon is avoided. In addition, it is possible to avoid the generation of an annual ring-shaped pattern centered on the bobbin axis on the package end surface caused by increasing the variation per unit time of the traverse reciprocating speed.

Therefore, there is a problem in the thread dropping that occurs when such an annual ring-shaped pattern is extreme, or in the process passability with a subsequent process, such as when the yarn is loosened during unwinding and the yarn sending tension changes. Not only can be avoided, but also a good package form can be obtained in terms of quality.

The yarn winding method of the present invention is particularly suitable for
It is effective for high-speed winding of synthetic fiber yarns having a fineness of 00 decitex or more.

[0031]

EXAMPLES The structure and effects of the present invention will be further described below with reference to examples. Example 1 In the yarn winding device shown in FIG.
40 polyester fiber yarn of 40 decitex, winding speed 6
Under the condition of 000 m / min, inner diameter is 940 mm, outer diameter is 110 m
m and wound using a paper bobbin (paper tube) having a length of 230 mm. In this case, when the winding is performed with the winding ratio W constant (W = 10.286) from the beginning to the end of the winding, a winding shape without ribbon winding is obtained, the yarn is hardly dropped, and the unwinding property is good. there were.

[Embodiment 2] In Embodiment 1, the vibration width of the traverse rotation speed during the first 60 seconds of winding was changed to 5
Winding was performed by a control method of changing the vibration in the range of 800 to 6200 m / min. Thereafter, the yarn was wound under the same conditions as in Example 1. As a result, a winding shape without ribbon winding was obtained, the yarn was hardly dropped, and the unwinding property was good.
In addition, a beautiful wound shape was obtained without generation of an annual ring-shaped pattern centered on the bobbin axis on the package end surface.

[Comparative Example 1] In Example 1, as a result of winding by a conventional winding method with a constant twill angle without keeping the wind ratio W constant, a ribbon shape is generated and the yarn is easily dropped. And the unwinding property was poor.

[0034]

As described above, according to the yarn winding method of the present invention, even if the number of ribbon regions generated per unit time is large, the ribbon is prevented from being generated even when the package is thickened rapidly. In addition, it is possible to avoid the generation of an annual ring-shaped pattern centered on the bobbin axis on the package end surface, which is caused by increasing the variation of the traverse reciprocating speed per unit time.

Therefore, there is a problem in thread dropping that occurs when such an annual ring-shaped pattern is extreme, or in the process passability with a subsequent process, such as when the yarn is loosened during unwinding and the yarn sending tension changes. Not only can be avoided, but also a good package form can be obtained in terms of quality.

[Brief description of the drawings]

FIG. 1 is a schematic front view illustrating an example of a yarn winding device provided with a cam traverse device used in the method of the present invention.

FIG. 2 is a time diagram of a spindle rotation speed and a traverse reciprocating speed for explaining an embodiment of the present invention.

FIG. 3 is a schematic perspective view showing one embodiment of a package wound by a control method of controlling a traverse reciprocating speed so that a wind ratio becomes a preset constant value, and the number of leads serving as a basis for determining a wind ratio; Is shown in (a), the number of ribbons is shown in (b), and the shift amount is shown in (c).

FIG. 4 is a spindle speed showing a method of determining a set time when winding is performed by a method of vibratingly changing a traverse speed from a predetermined constant value until a predetermined time elapses from the completion of thread switching in the present invention. FIG. 7 is a time diagram of the traverse reciprocating speed.

FIG. 5 is a schematic diagram showing an example of a control loop of a traverse control method in the method of the present invention.

[Explanation of symbols]

 1: groove 2: groove cam 3: traverse tip 4: yarn 5: traverse guide 6: yarn package 7: bobbin 8: spindle

Claims (4)

[Claims] A traverse device for reciprocating a traverse tip on the groove in a winding axis direction by rotating a groove cam having an endless spiral groove formed by a traverse motor, and a spindle equipped with a bobbin. In a method of winding a yarn using a yarn winding device having a spindle device that is driven to rotate by a spindle motor and a control device that controls the rotation speed of the traverse motor and the spindle motor, a method of winding the yarn during winding is performed. Detecting the rotation speed of the spindle, and controlling the rotation speed of the traverse motor so that a wind ratio W calculated from the spindle speed and the moving speed of the traverse tip in the winding axis direction becomes a preset value. A yarn winding method characterized by the following. 2. The yarn winding method according to claim 1, wherein the rotation speed of the traverse motor is vibrated from a predetermined constant value during a predetermined time from the start of bobbin winding. . 3. The winding ratio W is determined by the number of leads indicated by the number of end positions at which the yarn stitches are turned over during one round of the package by reciprocating the traverse, and the yarn for one round of the package is formed on the package. The number of ribbons represented by the number of intersections where a straight line drawn in parallel with the package axis between the two widths of the package intersects with the twill of the yarn generated by winding, and the number of the leads Is set in advance from the amount of deviation indicated by the angle at which the last fold position is shifted in the winding direction with respect to the first fold position during winding so that the number of folds of the yarn occurs. The yarn winding method according to claim 1 or 2, wherein: 4. The yarn winding method according to claim 1, wherein the control device can set the winding ratio to three digits after the decimal point.