JP2000247544A - Ribboning preventing method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ribboning preventing method and device for surely preventing the ribboning. SOLUTION: In this ribboning preventing method in the winding of a thread while rotating a package on a traversing drum, the winding is executed under the disturb control to reduce a speed ratio of the traversing drum from a winding start T0 of the package P to a point Tb in some degree before a winding diameter Tr forming a large ribbon, and the winding is executed without the disturb control from the point Tb in some degree from the winding diameter forming the large ribbon to a point Tc just before the same. Then the winding is executed under the disturb control to increase the speed ratio of the traversing drum from the point Tb just before the winding diameter to form a large ribbon to a point Tc over the winding diameter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for preventing ribbon winding of an automatic winder or the like.

[0002]

2. Description of the Related Art An automatic winder winds a spinning bobbin produced by a spinning machine into a package rotating on a traverse drum to form a package having a predetermined yarn amount and shape.

When the number of revolutions of the traverse drum and the package becomes an integral multiple or a fraction of an integer during the winding of the package, the traverse cycle and the package winding cycle are synchronized, and the yarn to be wound is wound. Gather at the same place and overlap, so-called ribbon winding occurs.

[0004] In the package in which the ribbon winding has occurred, the ribbon winding yarns are entangled with each other, and when the yarn of the package is unwound in a subsequent process, the sluffing is performed by unwinding the ribbon winding yarn from the package at once. Will cause.

When the number of winds of the traverse drum is Dw, the diameter of the drum is Dd, the number of winds of the package is Pw, and the diameter of the package is Pd, the following equation (1) is established.

Pw = Dw × Dd / Pd (1) The rotational speed of the drum is Nd, and the rotational speed of the package is N.
Assuming that p, the winding number Pw of the package has the relationship of the following equation (2).

Pw = Dw × Np / Nd (2) According to the above equation (1), the ribbon diameter is Dd = 98 m.
m and the number of drum winds Dw = 2.5, the package diameters Pd are 81 mm (3 W) and 98 mm, respectively.
(2.5 W), 122 mm (2 W), 163 mm (1.
5 W) and 245 mm (1 W).

Conventionally, in order to prevent the ribbon winding, as proposed by the present inventor in Japanese Patent Publication No. 2-40577, disturb control is performed, that is, the rotation of the traverse drum near the ribbon winding diameter. Is accelerated and decelerated to cause a slip between the package and the drum, and the yarn path of the traversing yarn is dispersed and wound, whereby the ribbon can be broken.

That is, even if the rotational speed of the drum (Nd) is increased or decreased, the package rotates at a substantially constant rotational speed (Np) due to its inertia force. Pw) can be changed to break the ribbon.

[0010]

As described above, when disturbance control is performed by increasing / decreasing the number of revolutions of the drum near the ribbon winding diameter, the number of winds wound around the package changes minutely. Changes, the ribbon enters the ribbon winding area, and in reality, fine ribbon winding occurs other than the ribbon generation diameter, and when the package is unwound, the ribbon yarns become entangled with each other, causing latching and new yarn breakage. It was found that a serious problem occurred.

When this latching is performed by unwinding a large number of packages, the number of windings of the packages is remarkable near 1 W where a large ribbon is formed.
It has been found that with a package diameter such as 2 W and 3 W, the occurrence of latching due to the disturbance control is small.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a ribbon winding prevention method and apparatus capable of more completely preventing ribbon winding.

[0013]

SUMMARY OF THE INVENTION In order to achieve the above object, a first aspect of the present invention is a method for preventing a ribbon from winding when winding a yarn while rotating the package on a traverse drum. This is a ribbon winding prevention method in which winding is performed while performing disturbance control, and winding is performed without performing disturbance control some time before a winding diameter at which a large ribbon can be formed.

According to a second aspect of the present invention, the winding of the traverse drum is performed by disturb control with a small acceleration / deceleration ratio from the start of the package winding to the winding diameter at which a large ribbon can be formed. Winding without disturb control from some time before to immediately before, and then winding with disturb control with a large traverse drum increase / decrease ratio from just before the winding diameter where a large ribbon can be formed until it passes through the winding diameter A ribbon winding prevention method according to claim 1.

According to a third aspect of the present invention, there is provided a ribbon winding prevention device for winding a yarn while rotating a package on a traverse drum, and an inverter device for controlling rotation of the traverse drum and a winding device capable of forming a large ribbon. A package diameter sensor that detects the package diameter from a certain point before the diameter, and the detection value of the package diameter sensor are input. Disturbance control is performed until a short time before and just before the winding diameter where a large ribbon can be formed, and then the traverse drum has a large acceleration / deceleration ratio until it passes the winding diameter where a large ribbon can be formed. A logic circuit that outputs a disturb command signal to the inverter device to perform control. It is a down-winding prevention device.

[0016]

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

First, the basic structure of an automatic winder to which the ribbon winding prevention method and apparatus of the present invention is applied will be described with reference to FIG.

The unit body 10 includes a traverse drum 11
A cradle 13 that is rotatable around a shaft 12 is provided behind the unit 10. Package P
Is rotatably held by the cradle 13 and is rotated in contact with the traverse drum 11 so that the yarn Y from the spinning bobbin is guided by the groove 14 of the traverse drum 11 and wound around the package P while being traversed. It has become.

The traverse drum 11 is connected to a drive motor 16 via a transmission device 15, and the drive motor 16
Can be driven by the inverter device 18 so as to be variable in rotation speed.

The shaft 12 of the cradle 13 has a package diameter transmitting member 19 that rotates with the cradle 13.
And a package diameter sensor 20 for detecting the diameter of the package P, particularly the diameter of the package P some time before one wind (1 W) from the rotational position of the package diameter transmitting member 19, is provided in the unit body 10. , The detection value of the sensor 20 is input to a programmable logic circuit 21.

The inverter device 18 temporarily converts AC from the commercial power supply 22 to DC, and turns on / off the transistor.
The F control converts a direct current into a variable frequency alternating current power supply.

The logic circuit 21 outputs a frequency command signal 23 to the inverter device 18 from the start to the end of the winding of the package P based on a control program of the number of rotations of the traverse drum 11.

The control program of the logic circuit 21 performs disturb control in which the acceleration / deceleration ratio of the traverse drum 11 is reduced from the beginning of winding of the package P to a point a little before the winding diameter at which a large ribbon can be formed. The traverse drum 11 is rotated at a constant speed without disturb control until just before the winding diameter at which a large ribbon can be formed.
Thereafter, the disturbance control in which the acceleration / deceleration ratio of the traverse drum 11 is increased is performed until the traverse drum 11 passes the winding diameter where a large ribbon can be formed.

FIG. 1 shows an example in which the logic circuit 21 controls the rotational speed of the traverse drum 11 to increase or decrease the number of package winds with respect to the package diameter.

In this case, the drum winding number Dw of the traverse drum 11 is 2.5 W, the drum diameter Dd is 98 mm, and the package diameter Dp of 1 W (the number of package windings) for forming a large ribbon is as described above (1). 24)
4 mm.

Therefore, in the present invention, as shown in FIG. 1, winding is performed by disturb control of, for example, ± 5%, 2/2 sec from the start of winding (T0) to the package diameter of 232 mm (Ta). Done, package diameter 23
During the period of 2 to 240 mm (Tb to Tc), winding is performed without performing disturbance control (0% acceleration / deceleration = constant speed rotation),
Package diameter Dp is 240 to 248 mm (Tc to Td)
Winding is performed under a large disturbance control of ± 15%, 2/2 sec, and the package diameter Dp is 248 mm.
± 5%, 2 / 2s from (Td) or more to the end of winding
By performing the winding with the disturb control of ec or the constant-speed rotation, a package in which the ribbon winding is completely eliminated can be obtained.

First, the present inventor unwinds a package wound by performing a disturbance control as in the prior art to some extent before a package diameter (244 mm, Tr) of 1 W at which a large ribbon is generated. An experiment was conducted to determine whether or not the frequency of occurrence of latching was high. As a result, it was found that latching occurred even when the package diameter was 240 mm or less before reaching 1 W. Then, when it was further examined at which package diameter 230 to 250 mm the latching occurred, it was found that there was a peak of the latching at the package diameter of 238 mm.

FIG. 4 shows the result of analyzing the amount of deviation when performing the disturbance control in order to find the cause and determining the influence of the ribbon winding by the disturbance control.
6 to FIG.

FIGS. 4 to 6 show the amounts of deviation with respect to the number of turns.

Here, the shift and the number of turns will be described with reference to FIG.

FIG. 3 shows the yarn path on the large diameter side wound around the package P at a certain diameter. The yarn path 27 wound in the next turn (traverse) with respect to the dotted line 26 is shown. Is wound as shown by the solid line, each yarn path 2
Corners 26a and 27a are formed by turning back the portions 6 and 27, and their circumferential positions are referred to as "shifts". in this case,
With respect to the rotation direction of the angle 26a, the deviation of each turn can be analyzed as positive if the angle 27a formed in the next turn deviates in the rotational direction and negative if deviated in the opposite direction.

Therefore, for various package diameters somewhat before 1 W, the speed is increased when the acceleration / deceleration ratio is ± 15% for 3 seconds, and then the 3 second deceleration is alternately repeated to perform a large disturbance control. The number and deviation were determined.

FIG. 4 shows a wind pattern of a shift from the package diameter of 242 mm with respect to the number of turns when disturb control is performed, and FIG.
7 shows a wind pattern of deviation from the number of turns when disturb control is performed from mm.

In FIGS. 4 and 5, when the deviation is 0 mm, the ribbon winding occurs, and the ribbon winding does not occur unless the region crosses this 0 mm area.

4 and FIG. 5, the center of the shift in FIG. 4 is at 0 mm, and the center of the shift in FIG.
m.

Here, the diameter (24) at which a ribbon of 1 W is generated
When performing the disturbance control from 242 mm immediately before (4 mm), the disturbance control having a small acceleration / deceleration ratio (for example,
When the acceleration / deceleration ratio is ± 3%, 3/3 sec), the wind pattern passes through the center of deviation (0 mm) many times, and the number of ribbon windings in the number of turns increases, which is not effective. As shown in (1), by performing a large disturbance control of ± 15%, the number of traversing the displacement of 0 mm can be reduced as much as possible, and the generation of a large ribbon can be eliminated.

However, as shown in FIG. 5, when a large disturb control of ± 15% is performed from a package diameter of 238 mm, which is a little before the diameter (244 mm) at which a ribbon of 1 W is generated, the wind pattern crosses a displacement of 0 mm. It was found that this was the cause of latching.

Therefore, as shown in FIG. 6, when the drum was rotated at a constant speed without disturb control from a package diameter of 238 mm to a package diameter of 240 mm, the deviation was constant at -80 mm, and no ribbon winding occurred. It turned out to be a stable region.

In other words, the package diameter 238 shown in FIG.
Performing the disturbance control of ± 15% based on mm results in the reverse winding of the ribbon, which was found to be useless control.

However, since a fine ribbon is generated up to a package diameter of 238 mm, which is a little before the winding diameter (244 mm) at which a large ribbon of 1 W is generated from the beginning of winding of the package, disturbance control is necessary.

Therefore, according to the present invention, as shown in FIG.
A certain distance (23 mm) before the diameter (244 mm) at which a large ribbon of 1 W is generated from the start of winding of the package (T0).
Until 8 mm, Ta), a small disturbance control of ± several% is performed, and from a certain time before (Ta) to just before (23).
In the case of 8 to 242 mm, Ta to Tb), by winding at a constant speed without performing disturbance control, the slip between the package and the drum is eliminated, and the diameter at which a large ribbon winding of 1 W occurs becomes accurate, and the ribbon winding occurs. Diameter (244m
m, Tr), the occurrence of ribbon winding is reduced as much as possible by performing a large disturb control of more than 10% from (242 mm, Tb), and thereafter, the diameter ("displacement") which passes through the ribbon winding generation diameter and increases 250mm, Tc)
By winding up without a few percent of disturbance control or disturbance control, a more complete package without ribbon winding can be obtained.

The control for preventing the winding of the ribbon shown in FIG.
The logic circuit 21 is programmed with a pattern in which the command frequency change of the frequency command signal 24 to the inverter device 18 based on the disturbance control is set as the disturbance command signal, and the control is performed by the diameter of the package P detected by the package diameter sensor 20. Determine the timing of

In the above-described embodiment, the disturbance control of ± several% is performed from the start of the winding of the package (T 0) to a point before the diameter at which a large ribbon of 1 W is generated (Ta) to some extent. Although an example in which control is performed at ± 5%, 2 seconds acceleration and 2 seconds deceleration has been described, the control is not limited to this value as long as it is a control that can perform a fine ribbon break, and a range of several% is suitable in the meantime. Disturb control may be performed by changing the acceleration / deceleration ratio. Further, immediately before the diameter at which a large ribbon of 1 W is generated (Tb), the ribbon winding generation diameter (Tr)
), A large disturb control (Tc) up to a diameter where the "displacement" becomes large (Tc) is shown as an example in which the control is performed with. +-. 15%, 2 seconds acceleration and 2 seconds deceleration. Is not limited to this value.

Although the description has been made mainly on the drum 11 of 2.5 W, it is needless to say that the invention can be applied to drums of 3 W, 2 W and 1.5 W. In this case, the package diameter at which the ribbon winding of 1 W is generated is 3 mm when the drum diameter is 100 mm.
300mm with W drum, 200mm with 2W drum, 1.
The above-described Ta, Tb, and Tc change depending on the number of drum winds. However, when Ta is slightly larger than the package diameter (Tr) at which a large ribbon of 1 W is generated, the deviation is 0 mm. Is sufficient if it is a stable region sufficiently distant from T. The immediately preceding Tb is performed when the deviation immediately before the occurrence of the 1 W ribbon winding is within, for example, 20 mm, and the Tc does not require disturb control. Set when the diameter is in the stable area.

[0045]

In summary, according to the present invention, by rotating at a constant speed without performing disturb control some time before a large ribbon is generated, the ribbon winding diameter becomes accurate. By doing
Large ribbon breaks can be made more effectively and reliably, and a more complete package without ribbon can be wound up.

[Brief description of the drawings]

FIG. 1 is a diagram showing disturbance control on a package diameter and the number of package winds in ribbon winding prevention in the present invention.

FIG. 2 is a view schematically showing a ribbon winding prevention device in the present invention.

FIG. 3 is a diagram illustrating a yarn path wound on a package in the present invention.

FIG. 4 is a diagram showing the relationship between the number of turns and deviation when winding is performed with disturb control performed at a package diameter of 242 mm.

FIG. 5 is a diagram showing the relationship between the number of turns and deviation when winding is performed by performing disturbance control with a package diameter of 238 mm.

FIG. 6 is a diagram showing the relationship between the number of turns and the deviation when winding is performed without performing disturbance control at a package diameter of 238 mm.

[Explanation of symbols]

 11 Twilling drum T0 Beginning of winding Tb Some time before Tc Just before P Package

Claims (3)

[Claims] In a method for preventing winding of a ribbon when winding a package while rotating the package on a traverse drum, winding is performed while controlling the disturbance from the start of winding of the package, and the winding diameter is increased to some extent before a winding diameter for forming a large ribbon. Wherein the winding is performed without performing disturbance control. 2. Winding is performed by disturb control in which the acceleration / deceleration ratio of the traverse drum is reduced from the beginning of winding of the package to a point a little before the winding diameter at which a large ribbon is formed, and from a point a little before the winding diameter at which a large ribbon is formed. The winding is performed without performing the disturbance control until the winding is performed, and thereafter, the winding is performed by the disturbance control in which the acceleration / deceleration ratio of the traverse drum is increased from immediately before the winding diameter at which a large ribbon is formed until the ribbon passes through the winding diameter. How to prevent ribbon winding. 3. A ribbon winding prevention device for winding a yarn while rotating a package on a traverse drum, an inverter device for controlling the rotation of the traverse drum, and a winding diameter before a certain diameter of a large ribbon. A package diameter sensor that detects the diameter of the package and the detection value of the package diameter sensor are input.Disturbance control with a small traverse drum acceleration / deceleration ratio is performed from the beginning of the package to a point before the winding diameter where a large ribbon can be formed. In this case, disturb control is not performed until a short time before the winding diameter at which a large ribbon can be formed, but immediately before the winding diameter at which the large ribbon can be formed. And a logic circuit for outputting a disturb command signal to the inverter device. Anti-winding device.