JPH05178537A - Ribbon winding preventing method for package - Google Patents

Abstract

PURPOSE:To escape a ribbon occurring area in a short time and to prevent the occurrence of ribbon winding by switching the rotation speed of a traverse drum from traverse in a decelerating direction to that in an accelerating direction on a specified condition when a package is formed by means of the traverse drum. CONSTITUTION:In an automatic winder, a yarn Y is wound around a package 2, rotating in a state to be in contact with a traverse drum 1, as the yarn is traversed by means of the traverse drum (a grooved drum for traverse) to form the package 2 with a given diameter. In a winding method described above, control is performed such that, at a point of time when the number of windings of the package 2 attains 1.0, the rotation speed of the traverse drum 1 is switched from a traverse state in a decelerating direction to a traverse state in an accelerating direction. Regulation of the rotation speed is effected through the working of a gear shifting device or the frequency control device of a drive motor run by an inverter. This method escapes a ribbon occurring area in a short time and prevents the occurrence of ribbon winding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ribbon winding preventing method for a package formed by a traverse drum.

[0002]

2. Description of the Related Art As an automatic winder, as shown in FIG. 3, a yarn Y is traversed by a traverse drum (traverse grooved drum) 1 and wound on a package 2 which comes into contact with the traverse drum 1 and rotates. , Package 2 of specified diameter
There is known an automatic winder configured to form a.

In such an automatic winder, the diameter of the traverse drum 1 is D, the diameter of the package 2 is d, the number of winds of the traverse drum 1 is W, and the number of winds of the package 2 is w.
Then, there is a relationship of DW = dw. In this case, since D and W are constants, the winding number w of the package changes in inverse proportion to the diameter d of the package as shown in FIG.
Here, the number of winds means the number of windings of the groove from one end to the other end in the traverse drum 1, and the number of windings of the yarn from one end to the other end in the package 2.

By the way, in the package, a ribbon wind is generated when the number of decimal points becomes 0 or 5 such as 1.0, 1.5 and 2.0. .. This ribbon winding becomes a resistance when pulling the yarn of the wound package from its axial direction to release it. However, when the diameter of the package becomes smaller, the yarn is lifted from the surface of the yarn layer by the balloon when unwinding, so problems such as yarn breakage do not occur easily, but when the diameter of the package is large, the yarn rubs the surface of the yarn layer. Therefore, trouble is likely to occur. The most dangerous part is a part where the number of winds of the package is 1.0, and before and after the part, ribbon winding is likely to occur. For example, in a 6-inch traverse, a traverse drum having a diameter of 200 mm and a wind number of 2.0 is often used. Ribbon winding with a winding number of 1.0 appears prominently, and many problems are likely to occur when unwinding.

Therefore, in order to avoid such a trouble at the time of unwinding the yarn, in the conventional package, the power source of the motor for rotationally driving the traverse drum is alternately turned on and off, and the rotational speed is maintained by the inertial force. On the other hand, by changing the number of revolutions of the traverse drum and causing a slip between the package and the traverse drum, the winding number of the package is dispersed as shown in FIG. The method of preventing the ribbon winding from concentrating is adopted in the shaded area around 1).

[0006]

However, in the above-described conventional ribbon winding prevention method, it takes a long time Ta to get out of the ribbon winding generation area, so that the ribbon winding cannot be sufficiently prevented.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above problems and to provide a ribbon winding preventing method for a package which can quickly remove the ribbon winding generation area and prevent ribbon winding.

[0008]

In order to achieve the above-mentioned object, the present invention, when forming a package by a traverse drum, changes the rotation speed of the traverse drum at the time when the winding number of the package becomes 1.0. The feature is that the state of swinging in the deceleration direction is switched to the state of swinging in the speed increasing direction to prevent ribbon winding.

[0009]

According to the above method, the traverse drum rotating in the decelerating direction is swung in the speed increasing direction on the opposite side when the package winding number is 1.0. It is possible to pass through or leave the area in a short time and prevent ribbon winding.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

In this embodiment, the package 2 is formed by using the automatic winder having the traverse drum 1 described above (see FIG. 3). When the package 2 is formed by the traverse drum 1, the package 2 is traversed. The rotation speed of the swing drum 1 is switched from the state of swinging in the deceleration direction to the state of swinging in the speed-up direction at the time when the winding number of the package 2 becomes 1.0 to prevent ribbon winding.

Shaking the rotational speed of the traverse drum in the decelerating direction (or the increasing direction) means that the rotating speed of the traverse drum is deviated from the certain reference rotational speed by a certain width in the decelerating direction (or the increasing direction). It means changing back and forth many times. When the rotation speed of the traverse drum is decelerated, slippage occurs between the package whose rotational speed is maintained by inertial force and the traverse drum whose rotational speed changes, as shown by A in FIG. The curve showing the relationship between the wind number and the wind number is a curve in which a number of upward hills are connected. On the contrary, when the rotational speed of the traverse drum is swung in the increasing direction, the curve is downward as shown by B in the figure. It will be a curve that connects many small mountains.

Therefore, the number of winders in the package is 1.0
By switching the swinging state from the former to the latter at the time point C, the mountain of the curve is divided into upper and lower parts at the time point C, and as a result, the ribbon winding generation area (the shaded area where the wind number is around 1) is generated. It can be removed quickly in a short time Tb, and ribbon winding can be prevented.

As means for swinging the traverse drum in the decelerating direction and the speed increasing direction, a speed change device provided between the traverse drum and its drive motor or a frequency control device for the drive motor by an inverter may be used. .. In the case of using the above-mentioned transmission, for example, a continuously variable transmission in which an endless belt is wound between tapered belt wheels on the driving side and the driven side is used, and the endless belt is swung in the deceleration direction and the acceleration direction by an actuator. do it.

In the case of using the frequency control device, for example, FIG.
When the reference frequency is 100 Hz as shown in,
It suffices to perform frequency control in a low frequency direction (deceleration direction) and a high frequency direction (acceleration direction) with a swing width (amplitude) of 8% and a predetermined cycle (dt = about 2 seconds).

[0016]

In summary, according to the present invention, the traverse drum is rotated in the deceleration direction while the traverse drum is swung in the deceleration direction at the time when the package winding number is 1.0. Therefore, the ribbon can be passed through or removed from the ribbon generation area in a short time, and the ribbon winding can be prevented.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a ribbon winding prevention method of the present invention.

FIG. 2 is a diagram showing a state in which a motor frequency is changed.

FIG. 3 is a perspective view showing a state in which a package is formed by a traverse drum.

FIG. 4 is a diagram showing the relationship between the package diameter and the number of winds.

FIG. 5 is a diagram for explaining a conventional ribbon winding prevention method.

[Explanation of symbols]

 1 traverse drum 2 package

Claims (1)

[Claims] 1. When forming a package with a traverse drum, the rotational speed of the traverse drum is changed from a state of swinging in a deceleration direction to a state of swinging in a speed-up direction at the time when the package winding number becomes 1.0. A method for preventing ribbon winding of a package, which comprises preventing ribbon winding.