JPH07138828A - Quality controlling apparatus for draw false-twister - Google Patents

Abstract

PURPOSE:To provide a quality controlling apparatus for a draw false-twister capable of getting the data for tension control, the data for yarn evaluation and the data for the inspection of the false-twisting unit at respective optimum time intervals. CONSTITUTION:This quality controlling apparatus is provided with a sampling means 15 for sampling measured tension data at a prescribed time interval (t), a memory 20 for separately storing at least the sampled tension data S, the mean value (m1) of the n1 tension data and the mean value (m2) of the n2 tension data, an evaluation means 17 for evaluating the tension data and generating an alarm when the evaluation result is out of a control limit, a controlling means 18 for controlling the tension according to the mean value (m1) and a transmission means 16 for transmitting the mean value (m2) to an upper surveillance apparatus 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a quality control device of a draw false twisting machine for digitally processing tension measurement data to control / evaluate / monitor tension, and particularly to data for tension control and evaluation of yarn. The present invention relates to a quality control device for a draw false twisting machine which can obtain data for monitoring and data for monitoring a false twisting unit at optimal time intervals and reduce the load on a computer.

[0002]

2. Description of the Related Art A drawing false twisting machine has a large number of false twisting units, and each false twisting unit runs a yarn while applying twist and tension to the yarn to perform false twisting. The nip twister provided in the false twisting unit consists of two endless belts that cross each other and come into contact with each other. The yarn is sandwiched between the belts, the yarns are run while rotating both belts, It gives a twist. The untwisting tension of the yarn immediately downstream (untwisting side) of the nip twister is greatly related to the quality and properties of the processed yarn. Therefore, each false twisting unit is provided with a measuring device for measuring the tension of the yarn on the untwisting side of the nip twister.

In recent years, digital processing is performed in order to accurately and diversify the processing of measured values such as tension.
If the device for sampling the measured value is provided for each false twisting unit, the equipment cost becomes too large, so that it is provided for each of the plurality of false twisting units together with the channel switch.

One method of utilizing the measured tension is tension control. The valve for tension control of each false twist unit is opened and closed according to the tension. The contact pressure of the belt of the nip twister is adjusted by opening and closing the valve. When the contact pressure of the belt is adjusted, the tension of the yarn changes downstream thereof. By performing the feedback control of the tension in this way, the quality and properties of the wound yarn are stabilized. In such feedback control, if the response is made too sensitive, hunting may occur. Therefore, it is preferable that the tension fluctuation is detected within a certain time width and the tension fluctuation is suppressed according to the detection result.

Another way to use the measured tension is to evaluate the yarn and monitor each false twist unit. Even if the tension control is performed as described above, a large tension fluctuation may occur instantaneously. In the yarn evaluation, if the tension exceeds the control limit for the yarn quality, it is judged as abnormal.
In monitoring, an alarm for abnormality determination is issued, the cause is analyzed, production is stopped in some cases, the yarn is discarded, and production is continued in some cases. A host computer that centrally manages the entire drawing false twisting machine is provided in order to display an abnormality alarm based on the evaluation of the yarn and to analyze the cause of the abnormality. The host computer collects abnormality alarm data and tension data of each false twisting unit and displays the data so that the operator can easily understand the data. The normal display is 1 so that the tension fluctuation of the whole drawing false twisting machine can be monitored at a glance.
It is preferable to display the tension data of all false twisting units on the screen, but since the number of false twisting units is large, the numerical values of the respective tension data are displayed side by side.

In the yarn evaluation, in order to detect the instantaneous tension fluctuation, it is necessary to improve the temporal resolution, that is, to shorten the sampling interval of the measured values. On the other hand, the timing to notify the host computer of the abnormal alarm is
Since it depends on the polling of the host computer, the interval is considerably longer than the sampling interval. Since the timing of evaluation may be in time for this notification, it may be a long time interval as compared with the sampling interval.

In monitoring each false twisting unit, the numerical value of the tension data displayed on the host computer is updated every time polling is performed, so that the tension data sampled over a long time width is required. Further, in order to analyze the cause when an abnormality occurs in the host computer, the raw tension data used for the evaluation, that is, the tension data with a short sampling interval is required.

[0008]

Problems to be solved by digital processing of untwisting tension in a drawing false twisting machine are summarized as follows.

It is necessary to shorten the sampling interval for evaluation. On the other hand, in tension control by adjusting the contact pressure of the belt, it is necessary to feed back the tension fluctuation within a time width that does not cause hunting, and this time width is considerably longer than the sampling interval. The display interval of the displayed tension data is even longer.
Thus, it is necessary to obtain sampling data of different time widths with one measurement system.

The host computer wants to display the status of many false twisting units in real time. For this purpose, it is necessary to constantly communicate with each false twist unit. Since the communication capacity is limited, we want to minimize the amount of data sent.

Since the measurement values of a plurality of false twist units are sampled by switching the channels, at least a time obtained by multiplying the sampling time for one channel by the number of false twist units is required to sample all the false twist units. Become. The sampling interval is constrained to this time. Further, in parallel with the sampling, it is necessary to reduce the time required for transmitting the tension data to the host computer and making the abnormality determination as short as possible.

Therefore, an object of the present invention is to solve the above-mentioned problems and obtain tension control data, yarn evaluation data, and false twist unit monitoring data at optimum time intervals, and An object of the present invention is to provide a quality control device for a draw false twisting machine that reduces the load on the computer.

[0013]

To achieve the above object, the present invention provides a sampling means for sampling tension measurement values at predetermined time intervals, and at least n1 average values m1 of sampled tension data S and tension data. And n2 average values m2 of tension data are separately held, evaluation means for evaluating the tension data and generating alarm data when the control limit is exceeded, and tension control according to the average value m1. The control means and the transmitting means for transmitting the average value m2 to the upper monitoring device.

[0014]

With the above structure, the predetermined time interval t of the sampling means for sampling the tension measurement value can be set to a sampling interval sufficient to detect an instantaneous tension fluctuation. Here, the memory data consisting of the sampled tension data S is D1, and the n1 average value m1 of the tension data is
Let B be memory data consisting of n and average data m2 of n2 average values of tension data be memory data C. n1 is made sufficiently larger than 1, n2 is made larger than n1, and the average value m1 of the tension data in the latest n1 samplings
Can be held as the memory data B, and the average value m2 of the tension data in the latest n2 samplings can be held as the memory data C.

Since the memory data D1 includes the tension data S, the tension can be evaluated based on the memory data D1. The evaluation means generates alarm data when the tension data S deviates from the control limit. On the other hand, the memory data B is the average value m1 of the tension data of the latest predetermined number of times n1. Since this average value m1 represents the average tension in the time width of t × n1, if the control means controls the tension according to the value of the memory data B, hunting does not occur. On the other hand,
The memory data C is the average value m2 of the latest tension data of a predetermined number of times n2. Since the average value m2 indicates the average tension in the time width of t × n2, the memory data C is suitable for display.

The transmitting means transmits the memory data C to a host monitoring device such as a host computer. The upper monitoring device can display the state of the false twist unit in real time using the memory data C.

The data transmitted by the transmitting means is the minimum necessary. The transmission data is prepared as the memory data C. Therefore, the time required for transmission can be shortened.

[0018]

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

First, the mechanical structure of the draw false twisting machine will be described. As shown in FIG. 6, the false twisting unit of the draw false twisting machine includes a yarn supplying package 62 and a yarn supplying package 62 that are mounted in multiple stages on a creel stand 61 in the order in which the yarn Y moves.
Yarn cutter 63 for cutting the yarn Y that is unwound from and supplied through the lower portion of the creel stand 61, a first feed roller 64 that causes the yarn Y to travel upward, and a first feed roller 64 that is set up above the creel stand 61. And a primary heater 65 that heats the yarn Y on the way,
Balloon control plate 66 that cools while guiding the yarn Y emitted from the outlet of the primary heater 65 to the nip twister side, the yarn Y
Nip twister 67 and nip twister 67
A tension sensor 68 for measuring the tension of the yarn Y downstream of the
The second feed roller 69 for moving the yarn Y downward, the second
A secondary heater 70 that is lowered from the feed roller 69 toward the floor F to heat the yarn Y, a third feed roller 71 that runs the yarn Y outside the secondary heater 70, and a yarn that detects the presence or absence of the yarn Y. The feeler 72 is provided in multiple stages along the outside of the secondary heater 70, and includes a winding device 74 that winds the yarn Y into a winding package 73. One drawing false twisting machine has, for example, 2
16 weights are provided.

The nip twister 67 has two endless belts 67a and 67b which intersect and contact each other, and twists the yarn Y by rotating the belts 67a and 67b. A desired twist number can be given by controlling the rotation speed of the belt. Further, the tension of the yarn Y can be changed by adjusting the contact pressure between the belts. In the above configuration, the twist given to the yarn Y from the nip twister 67 propagates to the first feed roller 64, and the twist is fixed after being heated and cooled by the primary heater 65, the balloon control plate 66, etc.
The false twist is imparted to the yarn Y by being untwisted in the downstream of.

To briefly explain the method for adjusting the contact pressure of the nip twister 67, one of the belts 67a and 67b is fixed and the other is swingably supported. The cylinder for swinging is provided with two valves for expanding and contracting the cylinder. One valve causes the cylinder to act in the direction of pressing the swingable belt against the fixed belt, and the other valve swings. The cylinder acts on the movable belt in a direction away from the fixed belt. The contact pressure adjusting mechanism will be described in detail with reference to FIG.

As shown in FIG. 8, the nip twister 6
7 is provided with a pair of endless belts 67a and 67b which cross each other by sandwiching the yarn Y to provide twisting and feeding. Each belt 6
7a and 67b are respectively wound around a drive pulley 116 and a driven pulley 117 supported by the frame 115. The rotation directions of the belts 67a and 67b are arrows B1 and B2, respectively. The belt 67a shown by the chain double-dashed line is the fixed side, and the other belt 67b is the drive pulley 116.
With the same shaft center as the fulcrum, it is swingably supported to adjust the contact pressure to the belt 67a on the fixed side, and is composed of a cylinder 125 and valves 131, 132, which will be described later, and a contact pressure adjusting means 140
The contact pressure is adjusted by being pressed by the fixed side belt 67a.

The drive pulley 116 and the driven pulley 117 are
The touch roller 11 is supported by the touch roller 118.
8 is rotatably supported by the frame 115, and by rotating the touch roller 118, the belt 67b can be swung in the direction of arrow R in the figure with the same shaft center as the drive pulley 116 as a fulcrum. A drive shaft (not shown) is inserted into the touch roller 118, and the drive pulley 116 is driven by a motor or the like. The touch roller 118 is rotatably supported by the frame 115, and the holder 119 is attached to the touch roller 118. This holder 119 has three lever parts 120,
A contact pressure adjusting pin 124 having 121 and 122 and provided with a spring 123 that biases the swinging belt 67b in a direction to separate the swinging belt 67b from the fixed belt 67a is in contact with the first lever portion 120. Has been done. A piston 126 of a cylinder 125, which presses and urges the swinging belt 67b against the stationary belt 67b against the force of the spring 123, is in contact with the second lever portion 121. Third lever portion 123
A stopper pin 127 that restricts the maximum swing position of the swing-side belt 67b is in contact with. Further, by rotating a lever 127a connected to the stopper pin 127, the belt 67a and 67b can be opened widely.

The cylinder 125 is a reserve tank 128.
, And an air pressure supply pipe 129 is connected to the reserve tank 128. The air pressure supply pipe 129 has an orifice 130 having a diameter of, for example, about 0.1 mm inside, and its upstream side is bifurcated and at the same time supplies a maximum air pressure Pu (hereinafter referred to as a first valve). 1
31 is connected, and to the other, a valve (hereinafter referred to as a second valve) 132 that supplies the lower limit air pressure Pd is connected. The orifice 130 and the reserve tank 128 are provided to prevent air pressure pulsation. An upstream side of the first valve 131 that supplies the upper limit air pressure Pu is connected to an air pressure supply source, and an upstream side of the second valve 132 that supplies the lower limit air pressure Pd is a supply source different from the upstream air pressure supply source. It is connected or is connected to an 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 set according to the type of yarn and the belt speed.

For adjusting the contact pressure, when the first valve 131 is opened, the upper limit air pressure Pu acts on the reserve tank 128 via the orifice 130. As a result, the pressure acting on the cylinder 125 gradually increases, the contact pressure between the belts 67a and 67b increases, and the untwisting tension decreases. When the first valve 131 is closed, the cylinder 125 maintains the pressure increased during that time, and the belts 67a and 67b are maintained at the contact pressure as it is. When the second valve 132 is opened, the lower limit air pressure Pd acts on the reserve tank 128, and the air pressure in the cylinder 125 decreases, which reduces the contact pressure between the belts 67a and 67b and increases the untwisting tension. When the second valve 132 is closed, the belts 67a and 67b are maintained at the contact pressure as they are.

In FIG. 8, a tension sensor 68 for detecting the untwisting tension T of the yarn Y is provided on the yarn path downstream of the belts 67a and 67b, and the detection signal from the tension sensor 68 is provided.
4 is input.

The structure of the tension sensor 68 and the principle of measuring the tension will be described with reference to FIG. Tension sensor 68
Is mainly a case 202, a substrate 203, a rotation angle detector 204, a rotating member 205, a movable yarn guide 206, a biasing means 207, an eccentric shaft 208, an upper stopper 209, an inlet side fixed yarn guide 210, and an outlet side fixed. It consists of a thread guide 211. The substrate 203 is the horizontal columns 202a, 202 of the case 202.
The rotation angle detector 204 is fixed to the substrate 203 with bolts or the like, and the rotation member 205 is directly fitted to the rotation shaft 204a of the rotation angle detector 204. The rotary member 205 is rotatable about the rotary shaft 204a as a fulcrum 220 and protrudes in one direction so as to rotate counterclockwise by its own weight. This rotating member 205
Is provided with a movable yarn guide 206, and the yarn Y is bent by being hung on the movable yarn guide 206, and a force to rotate the rotating member 205 in the counterclockwise direction is given by the tension. In order to oppose the movable yarn guide 206 as the force point 221,
The biasing means 207 for rotating the rotating member 205 in the clockwise direction is provided with the pin 205a and the pin 208a of the eccentric shaft 208.
And the pin 205a is the action point 222. The rotation angle detector 204 electrically detects a rotation angle of a magnetic angle sensor, an optical angle sensor, or the like.

In the state where the yarn Y is not applied to the movable yarn guide 206, the rotating force of the rotating member 205 due to its own weight W and the urging force F of the urging means 207 balance each other and the rotating member 205.
Attitude is decided. When the distance ε between the upper stopper 209 and the rotating member 205 is set to zero, the rotating member 205 becomes the reference horizontal posture. Then, when the eccentric shaft 208 is rotated, the rotating member 205 moves up and down via the biasing means 207, and the interval ε
Is adjusted to practically zero so that a minute gap gauge can be inserted.
The rotation angle detector 204 is set such that the rotating member 205 in this state corresponds to zero thread tension. Rotating member 20
Since the rotating force of the self-weight W of 5 and the rotating force of the urging force F of the urging means 207 are balanced and the reference horizontal posture is maintained, when a slight yarn tension is applied to the movable yarn guide 206, 205 rotates, and the rotation angle detector 204 detects the rotation angle. The detected rotation angle will represent the thread tension.

FIG. 1 shows a main part of an electric system of a quality control device for a draw false twisting machine according to the present invention. The part separated by the chain line corresponds to the management device 1 that manages the false twisting unit of 12 spindles, and 18 management devices 1 are provided to manage 216 spindles. The control unit 134 shown in FIG. 8 is configured by this management device 1.

The management device 1 is an 8-bit microcomputer 2 including a CPU, ROM, RAM, etc., a time interrupt device (not shown) built in the microcomputer 2, and a communication interface also built in the microcomputer 2. 27, bus 2 to microcomputer 2
A / D with 12-bit resolution connected via
The converter 4, which has 12 input terminals, selects one signal from these input terminals and outputs it to the A / D converter 4, and is connected to the I / O 28 incorporated in the microcomputer 2. 24 output interfaces 6
It consists of

Measuring means 7 for measuring the untwisting tension of each false twisting unit is connected to 12 input terminals of the channel switcher 5. The measuring means 7 corresponds to the tension sensor 68 in FIG. 7. The measuring means 7 sets a voltage corresponding to a tension of 0 g to 150 g into a full range, and the A / D converter 4 can convert the full range into a digital value of 0 to 4095. The A / D converted tension data is read in 2 bytes via the bus 3. Microcomputer 2, A
The / D converter 4 and the channel switch 5 are sampling means 15 for sampling the tension measurement values at predetermined time intervals.
Are configured. The output voltage of the measuring means 7 is usually in the range of 2 to 6 volts.

The 24 output interfaces 6 have 12
The valve 8 for increasing the tension and the valve 9 for decreasing the tension of each false twist unit are connected. Here, the valve 8 for increasing the tension is the second valve 132 in the contact pressure adjusting mechanism of the nip twister 67, and the valve 9 for decreasing the tension is the first valve 131. Although not shown, the red lamp of each valve is lit when the valve is operating, and the green lamp is lit when the valve is not operating.

The communication interface 27 of the microcomputer 2 of the management apparatus 1 operates by a program of the microcomputer 2 and constitutes a transmitting means 16 for transmitting memory data C, alarm data, and memory data D, which will be described later. Each management device 1 has a communication interface 27.
Via an RS485 compliant network 10 which has a 9600 baud communication line. A repeater 11 is connected to the network 10. The relay device 11 is used for RS of the communication of the network 10.
It can be relayed to the centralized management device 13 via the serial communication line 12 conforming to 232C. The communication speed of the serial communication line 12 is 1200 bps. The centralized management device 13 is composed of a personal computer equipped with a display, a keyboard and the like.

Next, the memory 20 comprising the RAM in the microcomputer 2 mainly has the latest 125 pieces of the sampled tension data S (corresponding to the holding time Ts = 5 sec), the alarm data, and the latest data. n1
= 10 (corresponding to 400 msec) tension data average value m1 memory data B, latest n2 = 100 (corresponding to 4 sec) tension data average value m2 memory data C, and alarm data are generated. At this time, the memory data D1 is transferred and saved, and the memory data D formed by successively storing 125 pieces of tension data (250 pieces in total; 5 seconds before and after) D2 are held. These memory data are retained for each of the 12 false twist units.

Further, various set values are stored in advance in the microcomputer 2, the main ones of which are control limit values H2 and H1 for evaluating the tension data and a contact pressure adjusting device. The upper and lower control values L1 and L2, and the upper limit of the number of continuous valve operations = 10 times.

The time management of the microcomputer 2 is mainly performed by the time interrupt device for an interrupt every 10 msec and T = for evaluating the tension data S in the memory data D1.
Evaluation cycle of 300 msec, valve operating time Ta =
0.5 sec, valve control prohibition time Tb = 2.0 s
ec, etc. The task activated in the evaluation cycle T constitutes the evaluation means 17 of the management device 1, and the task of managing the operation time Ta and the valve control inhibition time time Tb constitutes the control means 18 of the management device 1.

On the other hand, the memory of the central control unit 13 has a capacity of 120 megabytes, of which about 1.1 megabytes is transferred as the memory data D, and is an area for storing 2 bytes × 250 pieces of data for 10 times for each weight. Applied to. Further, the number of alarms of each weight, the cumulative time of alarms, the transferred memory data C, etc. can be stored.

Next, the operation of the embodiment will be described.

As shown in the timing chart of FIG. 2, the management device 1 receives an interrupt every 10 msec.
Sampling of three channels is performed sequentially. For example,
Sampling of the first, second, and third channels is performed by a certain interrupt, and sampling of the fourth, fifth, and sixth channels is performed by the next interrupt. In this way, 12 channels are sampled by four interrupts. The time required for A / D conversion and accompanying data update is 5 msec for the three channels. The sampling interval t is 40 msec for one channel. The sampled tension data are stored in chronological order as memory data D1 for each weight corresponding to the S channel, and the oldest tension data is discarded. By the continuation of this interruption, the memory data D1 of each weight becomes the latest tension data S for 125 pieces. The holding time Ts for holding the sampled tension data S is 5 sec.

The management device 1 updates the memory data B and the memory data C simultaneously with the sampling. Mean value m1 of the latest ten pieces of tension data to be the memory data B
Is equivalent to the tension data sampled at 400 msec intervals, and instantaneous fluctuations are removed to provide data suitable for tension control. Also, the average value m2 of the latest 100 pieces of tension data to be the memory data C is 4 se
It is equivalent to the tension data sampled at intervals of c and is suitable for display.

In the timing chart of FIG. 2, 5 msec from the end of the task of sampling by the interrupt to the next interrupt is assigned to the running of other tasks such as evaluation, control and communication described below, or idle time.

The graph of FIG. 3 is a tension fluctuation waveform in which sampled tension data are arranged in order over about 10 seconds. The memory data D1 is the latest 5 sec of this waveform.
Equivalent to. This waveform is obtained when the control target is about 75 g. Two reference values H2, H1, L1, and L2 above and below the control target are shown together with the waveform.

The management device 1 uses the evaluation cycle T = 300 mse.
The tension data S in the memory data D1 is evaluated for each c.
The evaluation is determined by whether the tension data S deviates from the control limit values H2 and L2, and if deviates, alarm data is generated and stored in the memory 20. Alarm data is 1
It consists of the number of childbirths of warnings at Doff and the duration of the warnings. In other words, the management device 1 calculates the number of times of miscarriage every time the package is replaced, integrates the number of times of miscarriage every time an alarm is judged, and the time when the tension data is out of the control limit value (sampling interval unit). To measure. Simultaneously with the alarm determination, the memory data D1 is transferred as the first half of the memory data D. After that, the memory data D is sampled at each sampling.
Although the data of 1 is updated, the first half of the memory data D is still at the time of transfer, and the tension data is continuously accumulated in the second half of the memory data D. This accumulation is performed up to 125 times of sampling times.

In the above evaluation operation, since the evaluation cycle T is longer than the sampling interval, it is easy to measure the time out of the control limit value. It can also be detected that there is a peak of individual tension data. In the microcomputer 2 of the management device 1, since the evaluation task does not have to be run every time sampling is performed, the time consumed by the evaluation task is reduced, which contributes to shortening the sampling interval or ensuring idle time. It will be. On the other hand, the evaluation cycle T
Is shorter than the holding time Ts, so that one sampled tension data S is always used once for evaluation while remaining in the memory data D1, and there is no omission in evaluation.

The management device 1 compares the memory data B with the upper and lower management values H1 and L1. When the memory data B is within the range between the upper and lower control values H1 and L1, nothing is done, but when it is larger than the upper control value H1, the valve 9 for weakening the tension is operated, and conversely the lower control value is set. When it is smaller than the value L1, the valve 8 for increasing the tension is operated. Since the upper and lower control values H1 and L1 have a range, minute tension fluctuations near the control target do not participate in valve control. When operating the valves, each valve is operated for an operating time Ta = 0.5.
It lasts for sec and then becomes inactive. As a result, the contact pressure of the belt is adjusted, and the tension is increased or decreased so as to converge within the control value range. After that, during the valve control inhibition time Tb = 2.0 sec, the valve control is not performed regardless of the comparison result. As a result, the valve control is performed every 0.5 sec in 2.5 sec cycles, and the tension is excessively increased or decreased in spite of the simple control of valve actuation or non-actuation in a long control period. Never. In the microcomputer 2 of the management device 1, the control cycle and the operation time are fixed, the time interval is sufficiently long, and the control is simplified because it is the operation or the non-operation. The load on the microcomputer 2 can be reduced.

When the memory data B is still out of the control value range after the valve operation and the prohibition time have expired, the control device 1 repeatedly performs the valve control, but counts the number of times the control in the same direction increases and decreases continuously. , This is the maximum number of continuous operations =
When it exceeds 10 times, the valve is continuously opened. Such out-of-control conditions are usually detected in the evaluation and alarm data is generated. Further, in the false twist unit, the red or green lamp is continuously turned on as the bulb is continuously opened.

Communication is performed in response to polling from the centralized management device 13. The contents transmitted by the management device 1 are
The memory data C for 12 spindles is normally used. When the alarm data exists, the alarm data and the memory data D are added.

The operation of the centralized management device 13 will be described.

The centralized management device 13 sequentially polls each management device 1 via the network 10. The response of each management device 1 to this is as described above.
Here, the number of times the alarm has passed through the alarm contained in the alarm data is stored, and the duration of the alarm is integrated. However, since the data area for the memory data D is only ten times, it is discarded or overwritten after the eleventh time. The number of childbirths and the cumulative duration are used for package judgment. Package judgment may be made by cutting the thread and stopping the production when the number of alarms in a single doff or the cumulative duration time exceeds a predetermined value, or the production is continued,
The number of alarm crossings and cumulative duration may be used to rate the package.

The normal display of the central control device 13 is real-time tension data of all weights. On the display screen of the display, the numbers of the weights up to 216 and the numerical values of the tension data are displayed in a list. The tension data displayed here is the average value m of 4 sec which is the transfer data of the memory data C described above.
2 and is updated with the result of polling of the management device 1 having the weight. A numerical value displayed in a color different from the others (for example, in red) is an alarm display, and indicates that the alarm data and the memory data D have been obtained. There is a cursor display that can be moved on this display screen by keyboard operation etc.When the cursor is placed on the weight where the alarm is displayed and the raw data display command is executed, the display screen displays the raw data of the weight. Switch to.

The raw data display is a graph of continuous dots, and is composed of 125 pieces of tension data before and after the alarm. Of these, 125 in the first half are raw data used for evaluation in the management device 1, and 125 in the latter half are tension data accumulated after the evaluation. The graphs of FIGS. 4 and 5 are display examples based on actual examples. The method of analyzing the cause of the abnormal tension will be described using these examples.

In the graph of FIG. 4, the tension data before and after the time point t ₀ when the alarm data is generated are shown for 5 seconds, respectively. t
_{At 0} , a large peak P1 that exceeds the control limit value H2 appears, and nothing else stands out. This peak P1 is considered to be due to the tail. Since the tail is generated by splicing the yarn in the package production process,
It appears for a long time and sporadicly. The operator looks at this graph, determines that the cause of the alarm is the tail, and continues production. It is also possible to predict the number of tails included in one package and allow the alarm for that number in the package determination. On the other hand, in the graph of FIG. 5, the peak P1 at the time point t ₀ when the alarm data is generated and the peak P 1 slightly after that.
2 and are appearing. It is considered that these peaks P1 and P2 are not caused by the tail but are caused by tight spots in which the yarn quality is uneven. The operator looks at this graph, determines that the cause of the alarm is a tight spot, and stops production. In this way, not only the alarm is displayed, but also the raw data on which the alarm is based and the raw data immediately after that are displayed, so that the cause analysis is easy.

Next, another embodiment of the evaluation method in the management device 1 will be described. In this method, four values, large and small, are used as the evaluation criteria of tension. Here, the control limit values H2 and L2 and the control values H1 and L1 in the valve control in the evaluation method of the above-described embodiment are diverted to the reference value H2, H1,
It will be described with reference to the graph of FIG. 9 with L1 and L2.

First, the management device 1 measures the time when the peak of the tension peak exceeds the reference value H1, and if it is equal to or less than the time reference TL, generates alarm data of type SO (above for a short time) and The time is stored as time ta. If the time exceeds the time reference TL, alarm data of the type LO (longer than a long time) is generated and the time is stored as the time tc. Further, the time when the trough-shaped peak of the tension falls below the reference value L1 is measured, and if it is equal to or less than the time reference TL, alarm data of type SU (short-term undershoot) is generated and the time is stored as the time td. . If the time exceeds the time reference TL, warning data of the type LU (longer than a long time) is generated and the time is set to the time tb.
Memorize as.

Further, the management device 1 determines whether the peak exceeding the reference value H1 does not reach the reference value H2 or the reference value L is exceeded.
When the peak below 1 does not fall to the reference value L2, the alarm data is classified into the first alarm rank A1. Further, when these peaks exceed the reference value H2 or the reference value L2, the above alarm data is set to the second alarm rank A.
Classify into 2.

As a result, the alarm data is classified into four types SO, LO, SU, LU according to the vertical direction and the time width, and two ranks A1 depending on the intensity of the peak.
It is classified into A2. The classification table is shown in Table 1.

[0057]

[Table 1]

The peaks a, b, c and d in FIG. 9 are classified in the corresponding columns of Table 1. That is, since the peak a exceeds the reference value H1 for the time reference TL or less and does not reach the reference value H2, the peak a corresponds to the type SO of the first warning rank A1. Similarly, the peak b corresponds to the type LU of the alarm rank A1, the peak c corresponds to the type SU of the second alarm rank A2, and the peak d corresponds to the type LO of the second alarm rank A2.

According to this evaluation method, the content of the alarm data does not simply indicate that the tension is out of the control limit, but is in eight forms depending on the vertical deviation direction, the deviation time width, and the severity. Since it is classified into, it can be greatly useful for analyzing the cause of an abnormality.

The yarn defect length shown in the rightmost column of Table 1 is the yarn defect length. The yarn defect length is calculated by multiplying the total time during which the alarm data is generated, that is, ta + tb + tc + td by the yarn speed. To be done.

[0061]

The present invention exhibits the following excellent effects.

(1) The data for evaluating the yarn is obtained at a sampling interval sufficient to detect the instantaneous tension fluctuation, and the data for the tension control are averaged with a sufficiently large number of samples so as not to cause hunting. The data for monitoring is averaged over a larger number of samples, and each data is obtained at the optimum time interval.

(2) The minimum amount of data to be transmitted and the data for transmission is prepared in a predetermined memory, so that the time required for transmission can be shortened and the load on the computer is reduced. Can be lightened.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a main part of an electric system of a quality control device for a draw false twisting machine according to an embodiment of the present invention.

FIG. 2 is a timing chart of CPU operation in the management apparatus of the present invention.

FIG. 3 is a graph of tension fluctuation according to sampled tension data.

FIG. 4 is a graph of tension data before and after an alarm displayed on the centralized management device.

FIG. 5 is a graph of tension data before and after an alarm displayed on the centralized management device.

FIG. 6 is a side view showing a mechanical configuration of a drawing false twisting machine.

FIG. 7 is a schematic side view showing the measurement principle of the tension sensor.

FIG. 8 is a perspective view showing a contact pressure adjusting mechanism.

FIG. 9 is a graph of tension fluctuations used by the management device to generate alarm data.

[Explanation of symbols]

 13 Upper Monitoring Device 15 Sampling Means 16 Transmitting Means 17 Evaluation Means 18 Control Means 20 Memory

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display location G07C 3/14

Claims (1)

[Claims] 1. Sampling means for sampling tension measurement values at predetermined time intervals, at least sampled tension data S, n1 average values m1 of tension data, and n2 average values m2 of tension data are held separately. Memory, an evaluation means for evaluating the tension data and generating alarm data when it exceeds the control limit, a control means for controlling the tension according to the average value m1, and the average value m2 to a higher monitoring device. A quality control device for a draw false twisting machine, comprising: a transmitting means for transmitting.