JP2663825B2 - Management method in stretch false twisting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a management system capable of controlling the quality of a filament yarn produced by a false twisting device such as a belt-type nip twister which twists and feeds a yarn between crossed belts. About the method.

[0002]

2. Description of the Related Art The construction of this type of draw false twister will be described with reference to FIG. This drawing false twisting machine is composed of a large number of false twisting units 1 arranged side by side in the direction perpendicular to the paper surface. Each false twisting unit 1 draws a yarn (filament yarn) Y from a yarn supply package 3 supported by a creel stand 2. 1 feed roller 4
It has. The yarn Y that has passed through the first feed roller 4, the primary heater 5, and the balloon control plate 6 in this order is subjected to false twist by the nip twister 7. The false twisted yarn Y passes through the second feed roller 8, the secondary heater 9, and the third feed roller 10 and is wound by the winding device 11 on the winding package 12, completing the false twisting.

The nip twister 7 is provided with a pair of crossed belts 13 and 14, and twists and feeds the yarn Y between the belts 13 and 14. The twist formed by the nip twister 7 propagates to the first feed roller 4 and is thermally fixed by the primary heater 5. That is, the upstream side of the nip twister 7 is the twisting side, and the downstream side is the untwisting side.

[0004]

In such a nip twister (false twisting device), the tension on the untwisting side has an important effect on the quality or physical properties (e.g., expandability and dyeability) of the yarn. Therefore, various proposals have been made for controlling the contact pressure of the belt in order to maintain the untwisting tension at a certain value.

[0005] However, there is a problem that even if the untwisting tension is simply controlled to a constant value, a false-twisted yarn having a stable quality cannot always be produced. Particularly in recent years, partially drawn yarns (PO
Y, Partially Oriented Yar
n) is used, there is no guarantee that the quality will be constant even if the untwisting tension is controlled to be constant, such as when the stretching ratio is poor, and when the heater etc. upstream of the nip twister is defective, the nip twister If the operating conditions are different, such as abnormal belt wear, the quality cannot be guaranteed.

Accordingly, an object of the present invention is to provide a management method in a false twisting apparatus capable of producing false twisted yarn with stable quality.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a false twisting device for detecting the untwisting tension of a yarn downstream of a false twisting device and for setting the untwisting tension within a target range. In the management method in the stretch false twisting device for controlling the
If the untwisting tension exceeds the allowable limit, it is judged as abnormal
In addition, the upper limit and lower limit of the control range of the false twisting device
It can be set, and when the yarn feeding or drawing false twisting machine is abnormal, the upper
Even if the control value of the false twist device is maintained at the upper or lower limit,
Set the above false twisting device so that the untwisting tension does not fall within the target range.
This is set by limiting the control range .

[0008] The allowable limit range is set to a range exceeding the target range. It is preferable that the control range of the false twist device is limited. It is more preferable that the control range of the false twist device can be set. As the false twisting device, for example, a nip type false twisting device that performs false twisting and feeding by sandwiching a yarn between a pair of nip members is used. For example, a belt-type nip twister using a crossed belt as a pair of nip members is used. In this belt type nip twister, the contact pressure between belts or the speed of the belt is controlled by untwisting tension control means so that the detection result of the sensor falls within a predetermined range,
The control range of the contact pressure between the belts or the belt speed is limited. For example, in order to limit the contact pressure control range between belts, contact pressure control means including a cylinder that changes the contact pressure of the belt, and two valves that respectively supply the upper limit air pressure and the lower limit air pressure to the cylinder is provided. To be provided.

[0009]

According to the above construction, the untwisting tension is detected by the sensor, and when the untwisting tension does not reach the target range and exceeds the permissible limit value even when controlled by the false twisting device, it is determined that there is an abnormality. Abnormality of twisting device and detection of defective yarn can be easily performed.

[0010]

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

In FIG. 1, reference numeral 7 denotes a nip twister used in a draw false twisting machine. The nip twister 7 has a pair of crossed endless belts 13 and 14 for twisting and feeding the yarn Y.
Each of the belts 13 and 14 is wound around a driving pulley 16 and a driven pulley 17 supported by a frame 15, respectively, and is driven in directions of arrows A and B. The belt 13 indicated by a two-dot chain line is on the fixed side, and the other belt 14 is swingably supported on the same axis as the drive pulley 16 as a fulcrum to adjust the contact pressure on the fixed side belt 13. The contact pressure is adjusted by being pressed by the fixed belt 13 by a contact pressure adjusting means 40 including a cylinder 25 and valves 31 and 32 described later.

First, the driving pulley 16 and the driven pulley 17
Is supported by the touch roller 18 and the touch roller 1
8 is rotatably supported by a frame 15, and by rotating a touch roller 18, the belt 14 is driven by a driving pulley 16.
Can be swung in the direction of arrow C shown in FIG.

A drive shaft (not shown) is inserted through the touch roller 18, and the drive pulley 16 is driven by a motor or the like.
Is driven. Also, the touch roller 18
Is rotatably supported by the frame 15, and a holder 19 is attached to the touch roller 18. This holder 19
Has three lever portions 20, 21 and 22, and the first lever portion 20 is provided with the swinging belt 14 and the fixed belt 1.
A contact pressure adjusting pin 24 provided with a spring 23 for urging in a direction away from the contact member 3 is in contact with the contact pressure adjusting pin 24. Second lever part 2
1 is in contact with a piston 26 of a cylinder 25 that presses and biases the oscillating belt 14 against the fixed belt 13 against the force of the spring 23. A stopper pin 27 for restricting the maximum swing position of the swing side belt 14 is in contact with the third lever portion 22. Also, the stopper pin 27
By rotating the lever 27a connected to the belts 13, 1
It is also possible to open the four spaces greatly.

The cylinder 25 is connected to a reserve tank 28, and an air pressure supply pipe 29 is connected to the reserve tank 28. The air pressure supply pipe 29 has an orifice 30 of, for example, about 0.1 mm inside, and has an upstream side branched into two branches, and a valve (hereinafter, referred to as a first valve) 31 for supplying an upper limit air pressure Pu to one of them. Is connected, and the other side supplies a lower limit air pressure Pd (hereinafter referred to as a second valve).
32 are connected.

First valve 3 for supplying the upper limit air pressure Pu
1 upstream is connected to a pneumatic supply, and the lower air pressure P
The upstream side of the second valve 32 that supplies d is connected to a supply source that is separate from the upstream air pressure supply source, or is connected to the upper limit side air supply source via a pressure reducing valve or the like.

The upper limit air pressure Pu and the lower limit air pressure Pd are:
As will be described later, the setting is made according to the type of yarn and the belt speed.

A sensor 33 for detecting the untwisting tension T of the yarn Y is provided on the yarn path downstream of the belts 13 and 14, and the detection signal is input to the control unit 34.

A control range (target range) of untwisting tension is input to the control unit 34. In this control range, an upper limit value and a lower limit value are set with respect to the target value. The first valve 31 is opened (at this time, the second valve 32 is closed) while exceeding the upper limit value, and while the lower limit value is exceeded, the first valve 31 is opened. The second valve 32 is opened (the first valve 31 is closed at this time). As a result, the belts 13, 1
4 is controlled so that the untwisting tension T is maintained in a control range.

The control section 34 and the contact pressure adjusting means 40 constitute untwisting tension control means. The orifice 30 and the reserve tank 28 are provided to prevent air pressure pulsation.

In the above, the yarn Y sent by the nip twister 7 is wound around the package 12 (see FIG. 4), during which the untwisting tension T is detected by the sensor 33, and the detected value is sent to the control unit. 34. Control unit 3
In 4, a target value of the untwisting tension is input in advance, and at the same time, an upper limit value Tu and a lower limit value Td of the tension, which are control ranges for the target value To, are input, and based on the untwisting tension from the sensor 33. The contact pressure adjusting means 40 is controlled to adjust the contact pressure between the belts 13 and 14 so that the untwisting tension is controlled to the target value To.

This will be described in more detail with reference to FIGS.

FIG. 3 shows the relationship between the air pressure P supplied to the cylinder 25 and the untwisting tension T. From FIG. 3, the relationship between the air pressure P and the untwisting tension T is such that the untwisting tension T decreases as the air pressure P corresponding to the contact pressure between the belts 13 and 14 increases. Therefore, first, the upper limit Tu and the lower limit Td of the tension that can be produced stably with respect to the target value To of the untwisting tension T are set, and then the control range of the air pressure P is determined. That is, the upper limit Pu of the air pressure with respect to the upper limit Tu of the untwisting tension is obtained, and the lower limit Pd of the air pressure with respect to the lower limit Td of the untwisting tension is obtained. The air pressure supplied to the first valve 31 and the second valve 32 is set to be substantially equal to the upper limit value Pu and the lower limit value Pd.

In this manner, the upper limit air pressure Pu and the lower limit air pressure Pd for appropriately controlling the tension with respect to the target value To of the untwisting tension can be supplied to the valves 31 and 32, respectively. On the other hand, a control upper limit Tmax and a control lower limit Tmin, which are allowable limits exceeding the target range, are input to the control unit 34.

The contact pressure is adjusted by adjusting the untwisting tension T detected by the sensor 33 during the false twisting operation as shown in FIG.
While exceeding u, the first valve 31 is opened. Then, the upper limit air pressure Pu acts on the reserve tank 28 via the orifice 30. As a result, the pressure acting on the cylinder 25 gradually increases, and the contact pressure P between the belts 13 and 14 increases. As the contact pressure P increases, the yarns Y of the belts 13 and 14
Is increased in proportion to the contact pressure P, so that the untwisting tension T decreases. Then, the untwisting tension T becomes the upper limit Tu.
, Falls within the control range, the first valve 31 is closed,
The cylinder 25 maintains the pressure increased during that time, and the belts 13 and 14 are maintained at the same contact pressure.

Conversely, the controller 34 opens the second valve 32 while the untwisting tension T detected by the sensor 33 is lower than the lower limit Td. Then, the lower limit air pressure Pd acts on the reserve tank 28, and the air pressure of the cylinder 25 decreases, whereby the contact pressure P of the belts 13, 14 decreases.
The untwisting tension T increases. And the untwisting tension T is lower limit value T
When the pressure rises from d and enters the control range, the second valve 32 is closed, and the belts 13 and 14 are maintained at the same contact pressure.
In this way, the untwisting tension T is maintained in a constant control range with respect to the target value To.

However, when the yarn supply package 3 is a defective package or when an abnormality occurs on the draw false twister side, the air pressure P is kept at the upper limit Pu or the lower limit Pd (the first valve 31 or the second valve 32). Is kept open), the untwisting tension T detected by the sensor 33 does not enter the control range. That is, in the configuration of this control device, the belt 13,
Since the control range of the contact pressure between 14 is limited to the range determined by the upper limit air pressure Pu and the lower limit air pressure Pd, in such a case, the untwisting tension T does not fall within the control range. Further, in the present apparatus, when the control value exceeds the control upper limit Tmax, or when the control value falls below the control lower limit Tmin, that is, when the untwisting tension T cannot be converged to the control range, the apparatus is determined to be abnormal. You can discover the condition. When it is determined to be abnormal, for example, a warning is made or the thread is cut. If the yarn is cut, winding of a defective yarn is prevented, and a false-twisted yarn of stable quality can be produced.

When it is determined that there is an abnormality, the duration and the number of times of the abnormal state are stored for each winding package, so that the quality of the winding package can be determined.

In this case, the length of the yarn defect is determined based on the time (yarn length) during which the yarn is out of the upper and lower limits Tmax and Tmin, the number of defects is measured to determine the number of defects, and the yarn defect length is determined. The determination of the lightness of the defect is also performed at the same time according to the number of defects and the number of defects. The range of the upper and lower limits Tmax and Tmin can be set arbitrarily according to the yarn or the operating condition. Further, a judgment value of the lightness of the defect can be set. In addition, even if it is determined as abnormal above, the thread is not cut or warned, and if the defect is determined to be a serious defect based on the result of the determination of the minority of the defect, the thread is cut and a warning is issued. Is also good.

As described above, the quality of the package can be determined, and in the case of a defective package, the defective state can be determined, and the package having stable quality can be easily identified.

When it is determined that there is an abnormality, it is preferable to investigate whether the false twist device is abnormal or whether the POY is abnormal, and remove the cause.

The setting of the upper and lower limits of the control range with respect to the target value To can be freely changed according to the operating conditions and the untwisted yarn.

In the above embodiment, the contact pressure adjusting means 4
The cylinder 25 and the valves 31 and 32 have been described as examples with 0, but the untwisting tension may be adjusted by changing the speed of the belts 13 and 14 of the nip twister 7, or may be adjusted by other means. You may. A device other than the nip twister may be used as the false twisting device.

[0033]

In summary, according to the present invention, the untwisting tension is detected by the sensor, and when the untwisting tension is out of the allowable range without being controlled by the false twisting device, it is determined to be abnormal. Thereby, a yarn with stable quality can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of the present invention.

FIG. 2 is a diagram showing a control of a valve with respect to a change in untwisting tension and a change in air pressure thereof in the present invention.

FIG. 3 is a diagram showing a relationship between air pressure and untwisting tension in the present invention.

FIG. 4 is a diagram showing a schematic configuration of a drawing false twisting machine using the false twisting device.

[Explanation of symbols]

 7 Nip twister (false twist device) 13, 14 Belt 25 Cylinder 31, 32 Valve 33 Sensor 34 Control unit 40 Contact pressure adjusting means T Untwisting tension Y Yarn

Claims (1)

(57) [Claims] In a management method of a drawing false twisting device for detecting a untwisting tension of a yarn downstream of a false twisting device with a sensor and controlling the false twisting device so that the untwisting tension falls within a target range ,
If the untwisting tension exceeds the allowable limit, it is judged as abnormal.
And the upper and lower limits of the control range of the false twisting device.
Can be set, and when the yarn feeding or drawing false twisting machine is abnormal,
Even if the control value of the false twist device is maintained at the upper limit value or the lower limit value
The false twisting device so that the untwisting tension does not fall within a target range.
A method for managing a draw false twist apparatus, wherein the control range is set to be limited .