JP2000160441A - Abnormality-detecting device in spinning machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To determine the yarn break and the abnormality of a power-supplying part to a motor in a spinning machine having each spindle independently driven by the motor installed for each of the spindles. SOLUTION: An electric current value at the input side of an inverter installed for each spindle is measured by a currant sensor to control the drive of a spindle motor. A judging circuit judges the presence or absence of yarn break and abnormality of a power-supplying part by comparing the measured current value with threshold Iα. The measured value of the current by the current sensor when the spindle motor is normally rotated in the state in which an empty bobbin is attached to the spindle is used as the threshold Iα. The judging circuit judges that the state is the yarn break state when the measured current shows a constant value not less than the threshold Iα and the value continues for a prescribed time, and that the state is the abnormality of the power-supplying part when the value is a prescribed constant value less than the threshold Iα and continues for a prescribed time. The judging circuit distinguishes the abnormality of the power-supplying part into the partial abnormality of a phase wiring in the inverter, and the abnormality without the phase wiring in the inverter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality detecting apparatus for a spinning machine such as a ring spinning machine or a ring twisting machine, which independently drives a spindle of each spindle by a motor provided for each spindle.

[0002]

2. Description of the Related Art In recent years, in order to increase the number of spindles in a spinning frame, increase the spindle rotation speed, reduce noise, and save energy, etc., instead of driving all spindles of a spinning frame with a single motor, each of the spinning frames is driven by a single motor. An apparatus in which a spindle driving motor is provided for each weight has been proposed. For example, Japanese Patent Application Laid-Open No. 9-13235 discloses a drive system for a ring spinning machine as shown in FIG. In this system, an inverter 52 is provided for each drive motor 51 of the spindle of each weight, and the inverter 52 is connected to a DC power supply network
4 is connected. The DC power supply network 54 is powered from only one rectifier 55. Each inverter 52 is connected to a motor control mechanism 5 via a control lead 56 and a common lead 57.
8 and is controlled by the motor control mechanism 58 so that the drive motor 51 is rotated at a desired rotational speed. A measuring unit 59 for detecting a current supplied to each inverter 52 is connected to the conductor 53. Each measurement unit 59 is connected to an evaluation unit 60. Then, the evaluation unit 60 calculates the difference between the average output of each inverter 52 and the output of each inverter 52, and determines that the thread is broken when the value is equal to or more than a predetermined amount.

[0003]

Problems to be Solved by the Invention Japanese Patent Laid-Open No. 9-13235
According to the method disclosed in Japanese Patent Application Laid-Open No. H11-265, if the difference between the average value of the output of the inverter 52 of all weights and the output of the inverter 52 of each weight deviates by a predetermined value or more, it is determined that the thread is broken. Therefore, a decrease in current due to the disconnection of the motor is also determined to be a thread break. In the case of a ring spinning machine, if a yarn break is left, the bobbin is rotated in a state where it is not wound up, and not only wasteful energy is consumed, but also the yarn end that is not wound up by the bobbin is swung, and it is In some cases, the yarn being entangled with the yarn being spun out of the weight to be cut off. Therefore, when the yarn break is detected, the drive of the spindle of the weight is stopped, the operator performs splicing, and the spinning is restarted. In the case of yarn breakage, since the yarn wound on the bobbin is normally twisted, there is no problem even if the yarn is simply spliced and spinning is resumed.

[0004] However, in the case of a current drop due to the disconnection of the motor, the yarn is wound around the bobbin in a state where a predetermined twist is not applied until the motor is stopped by the stop command. Then, when the worker performs the restarting operation and the winding is restarted, the yarn is wound with the defective portion remaining on the bobbin. A similar problem occurs when a part of the internal wiring of the inverter 52 is disconnected. When winding is resumed without the operator noticing when a part of the internal wiring of the inverter 52 is broken and the motor cannot rotate normally, the evaluation unit 60 again determines that the yarn is broken as described above. Therefore, there is a problem that the motor is repeatedly stopped.

Further, in a spinning machine, since the yarn is wound on a bobbin on a spindle, a load applied to a motor for driving the spindle changes as time elapses from the start of winding.
In addition, the ring rail repeatedly moves up and down during winding,
The balloon shape of the yarn from the snell wire to the traveler differs depending on the position of the ring rail, and the load changes accordingly. Then, the weight in which the yarn breakage occurred during winding has a smaller winding amount than other weights, and the load applied to the driving motor also becomes smaller. Therefore, in the method disclosed in Japanese Patent Application Laid-Open No. 9-13235, in which the weight simply deviating from the average value is determined to be a thread breakage weight, it takes a long time to repair due to thread breakage and the winding amount is different. There is a problem that erroneous detection of a thread break increases for the changed weight.

The present invention has been made in view of the above problems, and has as its object to provide a spinning machine in which spindles of respective weights are independently driven by motors provided for the respective weights.
It is an object of the present invention to provide a spinning machine abnormality detecting device capable of distinguishing between a yarn break and an abnormality in a power supply section to a motor.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a large number of weights are provided, and the spindles of each weight are independently controlled by a motor provided for each weight. In the driving spinning machine, a driving unit for shifting the speed of the motor of each of the weights, a measuring unit provided for each of the weights, and measuring a current supplied to the motor of each of the weights, based on an output signal of the measuring unit. Determining means for determining whether the weight of the weight is broken or an abnormality of the power supply unit of the weight to the motor.

According to a second aspect of the present invention, in the first aspect of the present invention, there is provided an abnormality display section capable of displaying the thread break and the abnormality of the power supply section based on the output signal of the determination means. Was.

According to a third aspect of the present invention, in the first or second aspect of the invention, the determination means is configured to perform the measurement when the motor is normally rotated with an empty bobbin mounted on the spindle. Assuming that the measured current value of the means is a threshold value, and that the measured current value of the measuring means has continued for a predetermined time at a constant value equal to or greater than the threshold value, it is determined that the thread breakage,
It is determined that the power supply unit is abnormal when a predetermined constant value less than the threshold value continues for a predetermined time.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the driving means is an inverter provided for each weight, and the measuring means is an inverter. The amount of direct current input to is measured.

According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the determining means is provided when the current value measured by the measuring means is larger than zero and smaller than the threshold value for a predetermined time. It is determined that a part of the phase wiring in the inverter is abnormal, and when the measured current value of the measuring means is zero and continues for a predetermined time, it is determined that there is an abnormality other than the phase wiring in the inverter, and the determination results are stored in the storage unit. Is done.

According to the first aspect of the present invention, the spindle of each weight is independently driven by a motor provided for each weight. The motors of the respective weights are speed-change driven by driving means. The current supplied to the motor of each weight is measured by measuring means provided for each weight. Then, the thread breakage of the weight and the abnormality of the power supply unit to the motor of the weight are determined by the determination means based on the output signal of the measurement means.

According to the second aspect of the present invention, in the first aspect of the present invention, the thread break and the abnormality of the power supply section are displayed separately on the abnormality display section. According to a third aspect of the present invention, in the first or second aspect of the present invention, the current measured by the measuring means when the motor is normally rotated with the empty bobbin mounted on the spindle, The determining means is used as a threshold when determining an abnormality.
If the measured current value is equal to or more than the threshold value and continues for a predetermined time, it is determined that the thread breaks. If the measured current value is less than the threshold value and continues for a predetermined time, it is determined that the power supply unit is abnormal.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the motor of each of the weights is driven by an inverter provided for each of the weights. Then, the DC current input to the inverter is measured by the measuring means.

According to a fifth aspect of the present invention, in the invention according to the fourth aspect, if the measured current value continues to be a constant value larger than zero and smaller than the threshold value for a predetermined period of time when the motor is driven, the discriminating means determines whether or not the current in the inverter is high. Is determined to be partially abnormal. When the current value measured by the measuring means is zero and continues for a predetermined time, the determining means determines that there is an abnormality other than the phase wiring in the inverter. Then, those determination results are stored in the storage unit.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 shows a first embodiment in which the present invention is embodied in a ring spinning machine.
3 will be described with reference to FIG.

As shown in FIG. 3, the AC power supply 1
The DC converter 2 is connected. The draft motor 3 constituting the draft part drive system is connected to the AC / DC converter 2 via the inverter 4. The draft part drive system is operatively connected to a lifting drive system for raising and lowering the ring rail and the lappet angle via rotation transmission means (neither is shown), and the draft motor 3 also drives the lifting drive system. It has become.

Each spindle (not shown) is attached to each weight of the spinning machine.
Spindle motors 5 are provided as spindle driving motors for independently driving the motors. Each spindle motor 5 is connected to an AC / DC converter 2 via an independent spindle controller 6 and an independent chopper circuit 7.
It is connected to the. The chopper circuit 7 changes the output of the AC / DC converter 2 to a voltage suitable for a power supply for driving the spindle motor 5 and outputs the changed voltage. The spindle motor 5 is provided with a pulse generator 8 as a spindle rotation speed monitor that outputs a pulse proportional to the rotation speed of the spindle motor 5.

Inverter 4 and each spindle control device 6
Are electrically connected to the main controller 9. The main controller 9 includes a central processing unit (CPU) 10, a program memory (ROM) 11, a working memory (RAM) 12, an input device 13, an input interface 14a, an output interface 14b, and a serial interface 15. The CPU 10 is connected to the input device 13 via the input interface 14a, connected to the inverter 4 via the output interface 14b, and connected to each spindle control device 6 via the serial interface 15.

The CPU 10 operates based on predetermined program data stored in the program memory 11. The program memory 11 is a read-only memory (ROM), and stores the program data and various data necessary for executing the program data. The program data includes data relating to spinning conditions such as various fiber types, spun yarn counts and number of twists, and the spindle rotation speed during steady operation and the rotation speed of the draft motor 3.

As shown in FIG. 2, the spindle control device 6
Includes an inverter 16 as driving means for converting DC power into AC power, a control circuit 17, a determining circuit 18 as determining means, a gate driving circuit 19, and a serial interface 20. The control circuit 17 includes a central processing unit (CPU) 21 and a program memory (ROM) 22
And a working memory 23 as a storage unit.
The CPU 21 operates based on a program stored in the program memory 22. The CPU 21 can communicate with the main controller 9 via the serial interface 20, and can receive a command signal from the main controller 9 and transmit data to the main controller 9. In this embodiment, an AC power supply 1, an AC / DC converter 2,
The chopper circuit 7 and the inverter 16 form a power supply unit to the spindle motor 5.

The inverter 16 has six transistors T1
2, the collectors of the upper three transistors T1 to T3 are on the positive pole side of the chopper circuit 7, and the emitters of the lower three transistors T4 to T6 are on the negative pole side of the chopper circuit 7 in FIG. It is connected. The connection points between the emitters of the upper transistors T1, T2, and T3 and the collectors of the lower transistors T4, T5, and T6 serve as output terminals and are connected to the spindle motor 5. As the spindle motor 5, a synchronous motor (for example, a DC brushless motor) is used.

The CPU 21 is connected to the determination circuit 18 and the pulse generator 8 via an input interface (not shown), and connected to the gate circuit 19 via an output interface (not shown). The CPU 21 controls the inverter 16 via a gate drive circuit 19 based on a command from the main controller 9 and performs feedback control on the spindle motor 5 based on an output signal from the pulse generator 8.

The inverter 16 of each spindle control device 6
The power supply line 24 connected to the input side is provided with a current sensor 25 as measuring means for measuring a current supplied to the spindle motor 5. The determination circuit 18 is formed of, for example, a one-chip microcomputer, receives an output signal of the current sensor 25, compares the measured current value Im with a threshold value Iα, and determines whether there is a yarn break or an abnormality in the power supply unit. Is output to the control circuit 17. As the threshold value Iα, a current value measured by the current sensor 25 when the spindle motor 5 is normally rotated with an empty bobbin mounted on the spindle is used, and a value obtained by an experiment in advance is used. . The determination circuit 18 determines that the thread break has occurred when the measured current value Im has a constant value equal to or greater than the threshold value Iα and continues for a predetermined time, and when the measurement current value Im continues for a predetermined time with a predetermined constant value less than the threshold value Iα, the power supply unit Is determined to be abnormal.

Further, the determination circuit 18 further determines the abnormality of the power supply unit into an abnormality outside the inverter and an abnormality inside the inverter. That is, when the measured current value is zero and continues for a predetermined time, it is determined that the power supply unit other than the inverter is abnormal, and when the measured current value is greater than zero and smaller than the threshold value Iα and continues for a predetermined time, the inverter is stopped. It is determined that there is an abnormality. The determination circuit 18 outputs to the control circuit 17 an abnormality signal that distinguishes between an abnormality in the inverter and an abnormality in the power supply unit other than the inverter.

Each of the weights has two indicator lamps 26a as an abnormality display section capable of displaying a thread break and an abnormality in the power supply section.
26b are provided respectively. Both indicator lights 26a, 2
6b is illuminated in a different color. In this embodiment, the indicator light 26a for thread breakage is illuminated in orange, and the indicator light 26b for abnormality of the power supply unit is illuminated in red. CPU
Reference numeral 21 is connected to both indicator lights 26a and 26b via an output interface (not shown).

Based on the output signal of the determination circuit 18, the CPU 21 discriminates a thread break and an abnormality in the power supply section, and outputs a lighting signal to a thread break indicator light 26a when the thread breaks, and an indicator light when the power supply section is abnormal. A lighting signal is output to 26b. CP
If the power supply unit is abnormal, U21 stores in the working memory 23 the result of discrimination between a partial abnormality of the phase wiring in the inverter and an abnormality other than the phase wiring in the inverter. Also, CPU
When the abnormality signal is output from the determination circuit 18, the stop control of the spindle motor 5 is immediately performed.

Next, the operation of the device configured as described above will be described. Prior to the operation of the spinning machine, spinning conditions such as the fiber raw material, the spun yarn count, and the number of twists are input to the main controller 9 by the input device 13. Then, when the operation of the spinning machine is started, the CPU 10 of the main control device 9 controls the draft motor 3 via the inverter 4 so as to have a predetermined rotation speed based on the input spinning conditions, A speed command signal is output to each spindle control device 6. The spindle control device 6 controls each of the spindle motors 5 at a predetermined rotational speed corresponding to a command signal from the main control device 9.

If the load applied to each spindle motor 5 is in a normal spinning state, the load gradually increases from the start of winding with an increase in the winding amount, and the power supplied to the inverter 16 also increases with it. . And during normal spinning,
The load is smallest in the state of an empty bobbin. In addition, since the winding amount does not increase in the thread break state, the load has a constant value corresponding to the winding amount at the time of the yarn break, and the value is set so that the spindle motor 5 rotates normally with the empty bobbin mounted. It becomes a value more than the load at the time of.

When an abnormality such as a disconnection occurs on the inverter 16 constituting the power supply unit or on the upstream side of the inverter 16 (on the side of the AC power supply 1), the power supplied to the inverter 16 decreases. If a disconnection occurs upstream of the inverter 16, the current supplied to the inverter 16 becomes zero. Further, when a part of the phase wiring in the inverter 16 is broken, the amount of current flowing through the inverter 16 is constant at a value smaller than the amount of current flowing when the empty bobbin is mounted. The phase wiring is the transistor T of the inverter 16
1 to T6 and thereafter. The determination circuit 18 determines whether an abnormality such as a thread break has occurred based on the current value measured by the current sensor 25.

Each determination circuit 18 determines whether the current sensor 2
5 to determine whether there is a yarn breakage or an abnormality in the power supply unit. The determination circuit 18 determines that the measurement is normal if the measured current value Im of the current sensor 25 is larger than the threshold value Iα, and determines that the measurement current value Im is constant and continues for a predetermined time. Whether the measured current value Im has changed or has continued for a predetermined time at a constant value depends on whether the plurality of measurement current values Im captured during the predetermined time gradually increases within an error range or is constant within the error range. Is determined by

As shown in FIG. 1, the determination circuit 18 determines that the thread breakage has occurred when the measured current value Im has continued for a predetermined time at a constant value equal to or greater than the threshold value Iα. When the measured current value Im is greater than zero and is smaller than the threshold value Iα and continues for a predetermined time, the determination circuit 18 determines that a part of the phase wiring in the inverter 16 is abnormal. If continued, it is determined that there is an abnormality other than the phase wiring in the inverter 16.
When the determination circuit 18 determines that an abnormality has occurred, the determination circuit 18 outputs an abnormality signal indicating the determination result of the abnormality to the control circuit 17. Note that FIG. 1 shows a state where the measured current value Im is slightly deviated from zero in order to make it easy to understand when the measured current value Im is zero.

When an abnormal signal is input to the CPU 21, stop control of the spindle motor 5 is immediately performed, and the spindle motor 5 stops. Further, a lighting instruction of the indicator light is output from the CPU 21, and if the yarn is broken corresponding to the type of abnormality, the display light 26a for indicating the broken yarn is lit,
If the power supply unit is abnormal, the indicator lamp 26b is turned on.

When the abnormality signal is a signal indicating an abnormality of the power supply unit, the type of abnormality, that is, a part of the phase wiring in the inverter 16 and an abnormality other than the phase wiring of the inverter 16 are stored in the working memory 23. Is done. Further, the CPU 21 outputs an abnormal data signal indicating the abnormality of the power supply unit to the main control device 9. The main controller 9 stores the type of abnormality in the abnormality storage area for each weight provided in the working memory 12.

When the indicator light 26a for indicating the yarn breakage is turned on, the operator or the piecing device performs the piecing operation of the weight,
When the indicator lamp 26b indicating the abnormality of the power supply unit is turned on, the piecing operation is not performed. When an abnormality occurs in the power supply unit, the maintenance worker confirms the abnormality and performs processing. The maintenance worker causes the display unit (not shown) provided in the main control device 9 to display the abnormal data of the abnormal weight,
After confirming whether there is any abnormality in the phase wiring in the inverter 16 or an abnormality other than the phase wiring in the inverter 16, the processing is performed. After the processing is completed, the abnormality display data stored in the working memory 23 is deleted. When the weight is spliced, in order to remove the yarn at a portion where the normal twist is not applied, the worker draws out a yarn of a predetermined length from the bobbin, removes the yarn, and then splics the yarn.

This embodiment has the following effects. (1) Based on the output signal of the current sensor 25 provided for each weight, the determination circuit 18 can determine the thread breakage of the weight and the abnormality of the power supply unit of the weight to the spindle motor 5. Therefore, by displaying the determination result, it is possible to selectively perform the splicing operation and the restart of the spindle motor 5 only for the thread breakage stop weight other than the abnormality of the power supply unit.

(2) Since there is provided an abnormality display unit which can display the thread break and the abnormality of the power supply unit separately, the operator can easily determine the yarn break and the abnormality of the power supply unit based on the display of the abnormality display unit. You can check.

(3) Since the indicator lamps 26a and 26b are provided for each weight as an abnormal display section, the operator can perform the splicing operation only on the weights for which the indicator lights 26a indicating thread breakage are lit. There is no need to perform unnecessary piecing work on the weight stopped due to an abnormality in the power supply unit.

(4) The determination circuit 18 determines the measured current value as the threshold value Iα when the spindle motor 5 is normally rotated with the empty bobbin mounted on the spindle, and the measured current value is the threshold value Iα. It is determined that the thread has been cut when a predetermined value equal to or more than the threshold value Iα has been continued for a predetermined time. Therefore, even if there is a weight whose winding amount is different from that of another weight due to the occurrence of a yarn break, the presence or absence of a yarn break can be accurately detected for each weight. Further, unlike the prior art in which the yarn breakage is determined based on the amount of change in the current value, the yarn breakage determination is also performed at the time of start-up in which the torque fluctuation of the spindle motor 5 is large, or at the time of sudden deceleration due to a full tube stop or halfway stop. Hard to make mistakes.

(5) The spindle motor 5 is controlled via an inverter 16 provided for each weight, and the current sensor 2
5 measures the amount of direct current input to the inverter 16. Therefore, even if the spindle motor 5 is a three-phase motor, an abnormality of the spindle motor 5 can be detected by one current sensor, and a DC sensor that is less expensive than an AC current sensor can be used as the current sensor 25.

(6) The judging circuit 18 discriminates the abnormality of the power supply section into a partial abnormality of the phase wiring in the inverter 16 and an abnormality other than the phase wiring in the inverter 16. It is stored in the memory 23 and the working memory 12 of the main control circuit 9. Therefore, when performing the process for eliminating the abnormality of the power supply unit, the maintenance worker can easily set the standard of the abnormal portion, which contributes to shortening of the operation time.

(7) A common AC / DC converter 2 as a power source for the draft motor 3 and the spindle motor 5
And the power after the chopper circuit 7 changes the voltage to a small voltage suitable for driving the spindle is supplied to the inverter 16 of each weight. Therefore, the inverter 16 of each weight
Capacity can be reduced.

(Second Embodiment) Next, a second embodiment will be described with reference to FIG. In this embodiment, the point that the number of spindle motors 5 of a large number of spindles is speed-controlled through a common inverter 27 and the point that a current sensor is provided for each spindle motor 5 on the output side of the inverter 27 are described above. This is significantly different from the embodiment. The same parts as those of the above-described embodiment are denoted by the same reference numerals, and the detailed description is omitted.

Each spindle motor 5 is connected to a common inverter 27 via three power supply lines 28. The inverter 27 is electrically connected to the main controller 9 and controls the driving of each spindle motor 5 based on a command from a CPU (not shown) of the main controller 9. Each feed line 28 is provided with a normally closed contact 29b of an electromagnetic contactor 29 for each weight. Further, an AC current sensor 30 as a measuring means for measuring a current supplied to each spindle motor 5 is provided on the two power supply lines of each weight. The electromagnetic contactor 29 is connected in series with the relay 31, and is controlled to be demagnetized by a command signal from the determination circuit 32.

A judging circuit 32 as a judging means is provided for each weight, and each judging circuit 32 judges a yarn breakage and an abnormality of the power supply section based on an output signal of the current sensor 30. The determination circuit 32 determines that the thread breakage has occurred when the measured current value has continued for a predetermined time at a constant value equal to or greater than the threshold value Iα, and has determined that the power supply unit has failed when the measurement current value has continued for a predetermined time at a constant value smaller than the threshold value Iα. I do. Then, when it is determined that there is an abnormality, the determination circuit 3
2 outputs an excitation command to the relay 31 and the electromagnetic contactor 2
9 is excited, the normally closed contact 29b is opened, and the spindle motor 5 is stopped. When the thread breaks, the display lamp 26a is turned on, and when the power supply unit is abnormal, the display lamp 26b is turned on. When the operator or the piecing device performs piecing, the normally closed contact 29b is closed and the spindle motor 5 is driven.

If the power supply section including the inverter 27 is abnormal, the determination circuit 32 for all weights determines that the abnormality is other than the thread breakage. Since the judgment circuit 32 outputs a signal indicating the abnormality to the main control device 9, the main control device 9 outputs a machine stop command when a signal indicating an abnormality other than the thread break is input from all the judgment circuits 32. .

Therefore, in this embodiment, the first
In addition to having the same effects as (1) to (4) of the embodiment, the following effects are also obtained. (8) Since the drive of the spindle motor 5 having a plurality of spindles is controlled by the common inverter 27, the number of inverters for controlling the drive of the spindle motor 5 can be reduced, and the manufacturing cost is reduced.

The embodiment is not limited to the above, and may be embodied as follows, for example. In the first embodiment, the output of the current sensor 25 is input to the control circuit 17 via the A / D converter without providing the determination circuit 18 separately from the control circuit 17, and the CPU 21 performs the operation based on the measured current value. Alternatively, the same determination as that of the determination circuit 18 of the first embodiment may be performed. In this case CPU
21 constitutes the determination means. In the control circuit 17 provided for each weight, the amount of work to be processed by the CPU 21 is small, so that there is no problem even if the CPU 21 is also used as the discriminating means. Further, the structure is simplified as compared with the case where the determination circuit 18 is separately provided.

In the first and second embodiments,
Each of the weights is provided with an indicator light for displaying only the abnormality without providing the indicator lights 26a and 26b for indicating the abnormality of each weight, and the thread is broken at a display unit (display) provided in the main controller 9. And an abnormality other than thread breakage may be confirmed. In this case, the number of indicator lights provided on each weight is halved. Also,
Instead of providing an indicator light for each weight, an indicator light is provided at the top of the frame of the spinning machine, and when an abnormality occurs, the indicator light is turned on,
The operator who has confirmed the lighting of the indicator light may confirm on the display of the main control device 9 whether the weight has an abnormality, the thread breakage, and the abnormality of the power supply unit. In this case, the display serves as an abnormal display section.

In the second embodiment, instead of controlling the drive of the spindle motor 5 of all weights via one inverter, the spindle motor 5 is divided into a plurality of groups and one inverter is provided for each group. May be used.
In this case, when the inverter fails, only the weights of the group need to be stopped, and a decrease in the operating rate of the machine is suppressed as compared with a configuration in which all weights are controlled by one inverter.

The induction motor may be used as the spindle motor 5 instead of the synchronous motor. Further, instead of the AC motor driven by the inverter, a motor driven by DC may be used. In this case, the speed control of the motor is performed via a chopper circuit.

In the first embodiment, instead of detecting the number of rotations of each spindle motor 5 and performing feedback control, control may be performed only by the inverter 16. In this case, the pulse generator 8 becomes unnecessary, and the configuration and control are simplified.

The measuring means may measure the current indirectly by measuring the voltage instead of directly measuring the current. In the first embodiment, when the abnormality data of the power supply unit is stored in the working memory 23, the restart of the spindle motor 5 is disabled even if the start switch of the spindle motor 5 is operated. In this case, the operator or the piecing device erroneously performs the piecing and restarting operation in a state where a measure for eliminating the abnormality of the power supply unit is taken and the abnormal data of the power supply unit stored in the working memory 23 is not erased. Even if the operation is performed, the spindle motor 5 is not started. Therefore, it is possible to prevent the yarn from being wound in a state where the defective portion where the predetermined twist is not applied remains on the bobbin.

The CPU 21 of the control circuit 17 outputs a signal indicating the result of the determination of the abnormality of the power supply unit or the yarn breakage to the determination circuit 1.
8, the data may be stored in the working memory 23, and the data signal may be output when the main controller 9 inquires about the presence or absence of abnormality and the type.
In this case, the CPU 21 outputs abnormal data to the main controller 9 only when necessary.

The chopper circuit 7 may be omitted. The present invention is not limited to the ring spinning machine, and may be applied to a single-spindle drive type ring twisting machine or the like.

The technical ideas (inventions) other than those described in the claims that can be understood from the above embodiments will be described below together with their effects. (1) In the invention according to any one of claims 1 to 3, the driving means is an inverter commonly provided to a plurality of weights, and a normally closed contact of a relay is provided on a power supply line of a motor of each weight. Is provided, and based on the abnormality determination signal of the determination means, the relay of the weight is excited to stop the motor.
In this case, the number of inverters that drive and control the spindle driving motor is reduced, and the manufacturing cost is reduced.

(2) In the invention according to claim 2,
The abnormality display section is two indicator lights of different colors provided for each weight. In this case, the operator can easily identify the abnormal weight by the color of the illuminated indicator lamp, and can easily identify the thread break and the abnormality of the power supply unit.

(3) In a spinning machine equipped with a large number of weights and independently driving the spindle of each weight by a motor provided for each weight, the current supplied to the motor of each weight is adjusted for each weight. It is measured by the measuring means, and when the measured current value of the measuring means continues for a predetermined time at a current value larger than the measured current value at the start of winding, it is determined that the thread breaks, and the measured current value is the measured current value at the start of winding. An abnormality detection method in a spinning machine that determines that an abnormality has occurred in a power supply unit when a current value smaller than the current value has continued for a predetermined time. In this case, even if there is a weight whose winding amount is different from that of other weights due to the occurrence of a yarn break, the presence or absence of a yarn break can be accurately detected for each weight, and the yarn breakage and a power supply unit to the motor can be detected. Abnormality can be determined.

[0059]

As described in detail above, according to the first to fifth aspects of the present invention, in a spinning machine in which a spindle of each weight is independently driven by a motor provided for each weight, The disconnection and the abnormality of the power supply unit to the motor can be determined.

According to the second aspect of the present invention, the operator can easily confirm the thread break and the abnormality of the power supply unit based on the display on the abnormality display unit. According to the third aspect of the present invention, even if there is a weight whose winding amount is different from that of another weight due to the occurrence of a yarn break, the presence or absence of a yarn break can be accurately detected for each weight.

According to the fourth aspect of the present invention, even if the motor for driving the spindle is a three-phase motor, the abnormality of the motor can be detected by one current sensor, and the measuring means can be replaced by the AC current sensor. Inexpensive DC sensors can be used.

According to the fifth aspect of the present invention, when performing a process for eliminating an abnormality in the power supply unit, the maintenance worker can easily give an indication of an abnormal location, thereby contributing to a reduction in work time.

[Brief description of the drawings]

FIG. 1 is a graph showing the operation of the first embodiment.

FIG. 2 is a circuit diagram showing a configuration of a spindle control device for one spindle.

FIG. 3 is a block circuit diagram showing an electrical configuration of the spinning machine.

FIG. 4 is a block circuit diagram of another embodiment.

FIG. 5 is a block circuit diagram of a conventional device.

[Explanation of symbols]

1: AC power supply constituting the power supply unit, 2: AC / DC
Converter, 5 ... Spindle motor as motor, 1
6, 27... Inverters as drive means constituting the power supply unit, 18, 32... Determination circuits as determination means, 25, 3
0 ... Current sensors as measuring means, 26a, 26b ... Indicator lamps as abnormality display section, 23 ... Work memory as storage section.

Continued on the front page (72) Inventor Yutaka Shinozaki 2-1-1 Toyota-cho, Kariya-shi, Aichi Pref. Inside Toyota Industries Corporation (72) Inventor Masaka Tsuboi 2-1-1 Toyota-cho, Kariya-shi, Aichi Co., Ltd. F term in Toyota Industries Corporation (reference) 4L056 AA02 AA32 BD32 DA33 EA12 EA19 EA32 EA43 EB12 EB18 EB30 EC70 EC85 ED11

Claims (5)

[Claims] 1. A spinning machine equipped with a large number of weights and independently driving a spindle of each weight by a motor provided for each weight, a driving means for shifting and driving the motor of each weight, A measuring unit provided for each of the weights and measuring a current supplied to the motor of each of the weights; judging, based on an output signal of the measuring means, a thread break in the weight and an abnormality in a power supply unit to the motor of the weight. An abnormality detecting device for a spinning machine, comprising: 2. The spinning machine abnormality detection device according to claim 1, further comprising: an abnormality display unit capable of displaying a thread break and an abnormality of the power supply unit in a distinguishable manner based on an output signal of the determination unit. 3. The method according to claim 1, wherein the determining unit sets a current value measured by the measuring unit when the motor is normally rotated in a state where the bobbin is mounted on the spindle as a threshold value.
It is determined that the thread break has occurred when the current measured by the measuring means has continued for a predetermined time at a constant value equal to or greater than a threshold value, and determined as an abnormality of the power supply unit when the current has continued for a predetermined time at a predetermined constant value less than the threshold value. The spinning machine abnormality detection device according to claim 1 or 2, wherein 4. The device according to claim 1, wherein the driving unit is an inverter provided for each weight, and the measuring unit measures a DC current input to the inverter. Spinning machine abnormality detection device. 5. The determination means determines that a part of the phase wiring in the inverter is abnormal when the measured current value of the measuring means is larger than zero and is smaller than the threshold value and continues for a predetermined time. When the measured current value of the means is zero and continues for a predetermined time, it is determined that there is an abnormality other than the phase wiring in the inverter,
The spinning machine abnormality detection device according to claim 4, wherein the determination results are stored in a storage unit.