JP3114415B2 - Management method of false twisting machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for managing a false twisting machine which can determine the maintenance time of a weight in a false twisting machine which twists a yarn supplied by a false twisting device such as a belt type nip twister and winds the yarn around a package. Things.

[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 vertical (horizontal)
Each of the false twist units 1 includes a first feed roller 4 that draws out a yarn (filament yarn) Y from a yarn supply package 3 supported by a creel stand 2. This first feed roller 4
The yarn Y that has passed through the primary heater 5 and the balloon control plate 6 in this order is subjected to false twist by a nip twister (false twist device) 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]

However, in such a false twisting machine, the tension on the untwisting side has an important effect on the quality or physical properties (e.g., expandability and dyeability) of the yarn.
Various proposals have been made to control the contact pressure of the belt of the false twisting device 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, Polyethylen Oriented Yarn) is used, and when the stretching ratio is poor, there is no guarantee that the quality will be constant even if the untwisting tension is controlled to be constant, and the flow of the heater and the temporary In the case where the belt of the twisting device is abnormally worn, or the wear of the contaminated belt of the heater increases with time, the quality cannot be similarly guaranteed.

Accordingly, an object of the present invention is to provide a method of managing a false twisting machine that can easily determine a weight that needs maintenance from among a plurality of weights of the false twisting machine in order to guarantee yarn quality.

[0007]

In order to achieve the above object, an invention according to claim 1 comprises a false twisting device and a downstream of the false twisting device.
And a sensor that detects the untwisting tension of the yarn.
And the untwisting tension is set in the target range based on the detection value of the sensor.
To control the false twisting device to maintain the untwisting tension.
Changes in sensor values over time indicate whether maintenance is required.
This is a method of managing a false twisting machine that determines whether
The invention of claim 2 provides a false twist device and a yarn downstream of the false twist device.
And a sensor that detects the untwisting tension of the yarn
And a sensor for detecting false twist tension.
False twist that determines whether maintenance is necessary from the output value
It is a management method of the machine .

[0008]

When the contamination of the heater and the abrasion of the belt increase with time, the untwisting tension also increases with time. Therefore, provisional
False twisting to keep the untwisting tension downstream of the twisting device within the target range
Control of the sensor, and the change in
Configuration that determines whether maintenance is necessary from
In its untwisting by looking at the change over time of tension, for example, when the number-time untwisting tension is out of the target range is increased with time, can be determined that the need for the preservation of its weight. Ma
Of the yarn on the upstream side of the false twisting device and untwisting tension on the downstream side
Is detected by each sensor, and the detection value of both sensors is
Can determine if the weight needs maintenance.
You.

[0009]

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

FIG. 1 shows the overall structure of a false twisting machine 40. A plurality of winding devices 11 for winding false twisted yarn around a package 12 are provided vertically in three stages. The drive of these winding devices 11 is controlled by a control unit 34 described later. The package 12 wound by the winding device 11 is carried out to a transport line 41 after being doffed, although not described in detail. In this case, the control unit 34 stores information on which weight the package on the transport line 41 has produced in the transport order, and package discrimination data as described later. When being conveyed, quality is sorted and labeling, printing or marking is performed, and good products flow to the packing device 43 and defective products flow to the line 44 for sorting. The quality of these packages is stored for each weight, and this can be printed out 45 in package units or weight units.

FIG. 2 shows the details of adjusting the contact pressure and detecting the untwisting tension by the nip twister.

In FIG. 2, reference numeral 7 denotes a nip twister (false twisting device) used in a drawing false twisting machine, which 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. 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 the arrow 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.

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 inside, and the upstream side is branched into two branches.
One of them is connected to a valve (hereinafter, referred to as a first valve) 31 for supplying an upper limit air pressure Pu, and the other is connected to a valve (hereinafter, referred to as a second valve) 32 for supplying a lower limit air pressure Pd.

The 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 air pressure supply source on the upstream side, or is connected to the air pressure supply source on the upper limit side 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 36 for detecting the false twisting tension T1 of the yarn Y is provided on the upstream side of the belts 13 and 14, and a sensor 33 for detecting the untwisting tension T2 of the yarn Y is provided on the downstream yarn path. These detection signals are input to the control unit 34 described above.

The untwisting tension T2 downstream of the nip twister 7 is previously stored in the control unit 34 depending on the operating conditions and the type of POY.
A control range (target range) is input.
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 32 is closed at this time).
As a result, the contact pressure between the belts 13 and 14 is controlled, and the untwisting tension T2 is maintained in the control range.

In FIG. 2, reference numeral 35 denotes a handle. By operating the handle 35 at the start of the false twisting operation or the like, the handle 35 is released from the belt 13 on the swinging side, and threading can be performed.

In the above, the yarn Y is first detected by the upstream sensor 36 for the false twisting tension T1, enters the nip twister 7 and twisted and fed.
2 is detected and wound around the package 12 (see FIG. 4). Untwisting tension T2 detected by the downstream sensor 33
Is input to the control unit 34, and the contact pressure of the nip twister 7 is adjusted based on the input detection value.

That is, the controller 34 receives the target value To of the untwisting tension in advance and simultaneously receives the upper limit value Tu and the lower limit value Td of the tension, which are control ranges for the target value To. The contact pressure adjusting means 40 is controlled on the basis of the untwisting tension T2 to adjust the contact pressures of the belts 13 and 14 so that the untwisting tension T2 becomes the target value To.

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

FIG. 4 shows the relationship between the air pressure P supplied to the cylinder 25 and the untwisting tension T2. From FIG. 4, the relationship between the air pressure P and the untwisting tension T2 is such that as the air pressure P increases, the untwisting tension T2 decreases. Accordingly, 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 T2 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, the upper limit Pu of the air pressure with respect to the lower limit Td of the untwisting tension is obtained, and the upper limit Pu and the lower limit Pd are determined based on the obtained upper limit Pu and the lower limit Pd. 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 way, 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 opening the first valve 31 while the untwisting tension T2 detected by the sensor 33 exceeds the upper limit Tu during the false twisting operation as shown in FIG. 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. By increasing the contact pressure P, the feed speed of the yarn Y of the belts 13 and 14 increases in proportion to the contact pressure P.
The untwisting tension T2 decreases. Then, when the untwisting tension T2 falls below the upper limit Tu and enters 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 maintain the contact pressure as they are. Will be maintained.

Conversely, the controller 34 opens the second valve 32 while the untwisting tension T2 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, and the untwisting tension T2 increases. Then, when the untwisting tension T2 rises above the lower limit Td and enters the control range, the second valve 32 is closed, and the belts 13, 14 are maintained at the same contact pressure. In this way, the untwisting tension T2 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 enter 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. Also, the upper and lower management limits Tmax, T
The range of min can be set arbitrarily according to the yarn or the operating conditions. Further, the judgment value of the minority of the defect can be set. In addition, even if it is determined that there is an abnormality, the yarn is cut when it is determined to be a serious defect based on the result of the determination of the minority of the defect without cutting or warping the yarn. Alarms and warnings may be performed on display devices provided (corresponding to each weight). The yarn quality data is stored in the control unit 34 for each package, and the control unit 34 classifies each package based on the data for each package. That is, the determination data of each package is stored in the control device 34. When the package is doffed and taken out to the transport line 41 as shown in FIG. 1 after the completion of the winding of the package, the discrimination data is sent to the sorting device 42 in the package transport order to perform the sorting and labeling as described above. .

Further, the control unit 34 determines whether the number and the number of times that the untwisting tension T2 exceeds the allowable limit range and the time have increased with time based on the detected value of the untwisting tension T2 for each weight. If the weight has increased over time, it is determined that maintenance is necessary for the weight, and a display 46 provided for each weight notifies the weight by an alarm or the like. Moreover, the control unit 34 determines, for each weight,
The maintenance location is specified in consideration of the temporal change of the detected value of the false twist tension T1. That is, when the primary heater 5 shown in FIG. 5 is contaminated, the abnormality of the untwisting tension T2 tends to increase with time, and the detected value of the false twisting tension T1 tends to increase with time. If both the T2 false twist tension T1 tend to increase, it is determined that the primary heater 5 needs to be maintained. When the belts 13 and 14 of the nip twister are worn, the abnormal twist of the false twist tension T2 increases with time or the detected value of the false twist tension T1 tends to decrease with time. The tension T2 tends to increase, and the false twist tension T1
If there is a tendency to decrease, it is determined that the belts 13 and 14 are worn.

The display device for displaying that the untwisting tension is abnormal and the display device for displaying the weight requiring maintenance may be common, but are preferably provided separately from each other.

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.

[0034]

According Effect of the Invention] In summary the present invention, Sunawa
In order to keep the untwisting tension on the downstream side of the false twisting device within the target range,
Controls the false twisting device and controls the detection value of the sensor in the control.
Depends on the configuration that determines whether maintenance is necessary from aging
If, by observing the change with time of the untwisting tension, for example, by the number and time of untwisting tension is out of the predetermined set range seen that has increased over time, is the need for the preservation of its weight Therefore, the yarn quality can be stabilized.
In addition, the false twist of the yarn on the upstream side of the false twisting device and the untwisting of the yarn on the downstream side
The force is detected by each sensor, and the values detected by both sensors are
Can determine if the weight needs maintenance.
You.

[Brief description of the drawings]

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

FIG. 2 is a view showing details of a false twist portion in FIG. 1;

FIG. 3 is a diagram showing a control of a valve with respect to a change in untwisting tension and a change in air pressure in the present invention.

FIG. 4 is a diagram showing the relationship between air pressure and untwisting tension in the present invention.

FIG. 5 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) 11 Winding device 12 Package 33 Sensor 34 Control device

Claims (2)

(57) [Claims] 1. A false twisting device and untwisting a yarn downstream of the false twisting device.
A false twisting machine having a sensor for detecting tension,
Keep the above untwisting tension in the target range based on the detection value of the sensor.
Control the false twisting device in
Determine if maintenance is required based on the changes over time in the sensor values
A method of managing a false twisting machine. 2. A false twist device and untwisting a yarn downstream of the false twist device.
Sensor for detecting tension and false twisting of the yarn upstream of the false twisting device
And a sensor for detecting the force.
A method for managing a false twisting machine, comprising determining whether maintenance is necessary from the false twister.