JP2010202988A - Pneumatic device for spinning machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve the energy saving of a motor drive in a state of securing the reliability of a pneumatic device without installing a sensor for detecting a flow velocity and a pressure in a sucking duct. <P>SOLUTION: The pneumatic device is obtained by connecting the sucking duct for sucking fly waste and fiber waste generated in a spinning machine to a filter box generating a sucking air flow by the drive of a blower. The drive of a motor 16 for driving the blower by the electric power fed from an inverter 21 is controlled by the inverter 21. A controller 22 has a CPU 23 for measuring the output power of the inverter 21, and commanding the frequency to the inverter 21 so that the measured value may be the target value. The CPU 23 calculates the output power of the inverter 21 based on a signal detected by a current detector 25 for detecting the electric current fed to the motor 16. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a pneumatic device for a spinning machine.

  Generally, in spinning machines such as spinning machines and drawing machines, the fleece sent from the draft part when the yarn breaks is prevented from adversely affecting the weights other than the yarn breakage weight. It is equipped with a pneumatic clearer (pneumatic device) that sucks the fluff generated in the part. A spinning machine pneumatic apparatus includes a suction duct arranged so as to extend along a longitudinal direction of a machine base of the spinning machine, and a suction nozzle connected to the suction duct. The suction duct is one end of the machine base. Connected to the filter box. The filter box includes a fan driven by a filter and a motor. A negative pressure acts on the suction duct by driving the motor, and a suction action is generated on the suction nozzle by the action of the negative pressure. Then, fiber scraps such as fleece and fluff sucked from the suction nozzle are transported to the filter box through the suction duct, are captured by the filter, and are stored in the storage section partitioned by the filter. When a certain amount of fiber waste is stored in the filter box, the operator opens the door and appropriately collects the fiber waste in the accommodating portion.

  2. Description of the Related Art Conventionally, a pneumatic device has been proposed that prevents a malfunction from occurring when a yarn breaks due to a delay in operations such as collection of fiber waste from the filter box (see Patent Document 1). The pneumatic device of Patent Document 1 includes detection means for detecting the pressure or flow velocity in the suction duct corresponding to the suction force of the suction nozzle farthest from the filter box. In addition, the pneumatic device determines whether or not the detection value detected by the detection means is out of the set range, and outputs a notification signal notifying the detection value when the detection value is out of the set range, and notification of the determination means And a control means for driving the blower at an increased speed based on the signal. Therefore, when the pressure or flow velocity in the suction duct is out of the set range, the blower is increased in speed, and a reduction in suction force is prevented.

  Further, Patent Document 2 includes a control device connected to a ventilation motor in a device that controls suction ventilation by changing the rotation speed of the ventilation motor, achieves a negative pressure at the set reference rotation speed, and adjusts the negative pressure adjusted. A lint suction device that controls rotation with pressure has been proposed. The sensor for detecting the negative pressure is provided at the end of the suction device (suction duct) opposite to the side to which the filter box (filter box) is connected.

JP-A-11-302931 Japanese Patent Laid-Open No. 2003-96628

  However, in the apparatus described in Patent Document 1, the blower is accelerated so as to prevent a reduction in the suction force, but the suction force is controlled to an appropriate suction force in accordance with the accumulation amount of fiber waste in the filter box. That is, no consideration is given to avoid unnecessary power consumption without increasing the suction force more than necessary. Moreover, in the apparatus of patent document 1 and patent document 2, the flow velocity or pressure in a suction duct is detected with a sensor, and the blower and the ventilation motor are controlled based on the detection result. However, it is technically difficult to accurately estimate the actual suction amount of the filter box from the detection signal of one sensor provided in the suction duct. In particular, it is more difficult in the case of a long suction duct such as a suction duct of a spinning machine. In addition, when the sensor is provided at the end of the suction duct opposite to the side to which the filter box is connected, the length of the wiring connecting the sensor and the control device becomes long, and the wiring work takes time. There is a problem that it becomes easy to ride noise.

  The present invention has been made in view of the above-mentioned conventional problems, and its object is to provide a motor device in a state in which the reliability of the pneumatic device is ensured without providing a sensor for detecting the flow velocity and pressure in the suction duct. An object of the present invention is to provide a spinning machine pneumatic apparatus capable of achieving energy saving.

  In order to achieve the above object, the invention according to claim 1 is characterized in that a suction duct for sucking fluff and fiber waste generated in a spinning machine is connected to a filter box that generates a suction airflow by driving a blower. In a spinning machine having an output power measuring unit for measuring the output power of the variable frequency power source, and a measured value of the output power measuring unit. And a control unit for instructing the variable frequency power supply to have a frequency so as to achieve a target value. Here, the “variable frequency power supply” refers to the frequency and voltage, such as an inverter that converts DC power into AC power and outputs it, and a cycloconverter that directly converts three-phase AC power into AC power of another frequency and voltage. It means a device that can convert and output AC power.

  The present invention has been made by paying attention to the fact that the suction flow rate of the suction airflow toward the filter box by driving the blower is substantially proportional to the power consumption of the motor driving the blower. Strictly speaking, when the amount of fiber waste in the filter box changes, for example, there is a work loss, but it is relatively small. Electric power is supplied from a variable frequency power supply to the motor that drives the blower. The variable frequency power supply is controlled to have a frequency instructed by the control unit. The control unit instructs the frequency to the variable frequency power source so that the measured value of the output power measured by the output power measuring unit that measures the output power of the variable frequency power source becomes a target value. That is, unlike the prior art, the suction flow rate of the suction airflow toward the filter box is maintained at an appropriate value while suppressing wasteful energy consumption without detecting the pressure or flow velocity in the suction duct with a sensor. . Therefore, the energy saving of the motor can be achieved without providing a sensor for detecting the flow velocity or pressure in the suction duct while ensuring the reliability of the pneumatic device.

  According to a second aspect of the present invention, in the first aspect of the invention, the output power measuring unit is based on a detection signal of a current detector that detects a current supplied from the variable frequency power source to the motor. Calculate the output power. In general, variable frequency power supplies such as inverters and cycloconverters are equipped with a current detector that detects the current output from the variable frequency power supply in order to prevent overcurrent from flowing through the motor when the motor is controlled. Yes. Therefore, if the output power of the variable frequency power supply is calculated based on the detection signal of the current detector, the output power of the variable frequency power supply can be measured without providing a new sensor for power measurement.

  According to a third aspect of the invention, in the first or second aspect of the invention, the target value is set in relation to the suction flow rate of the filter box. Therefore, in this invention, it is easy to grasp whether or not the suction flow rate is in an appropriate state from the output power of the variable frequency power source, and it is easy to appropriately perform energy saving.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the spinning machine is a spinning machine, and the control unit calculates the suction flow rate from the number of spindles and the spinning yarn weight.
In the spinning machine, the suction flow rate necessary for performing an appropriate suction action is determined by the number of spindles and the weight of the spun yarn (weight per unit length of the spun yarn). In the present invention, since the control unit calculates the suction flow rate from the number of spindles of the spinning machine and the spun yarn weight, the control is performed based on an appropriate suction flow rate necessary for energy saving.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the control unit has no clogging in the filter of the filter box and is in an average atmospheric pressure state. The control of the variable frequency power supply is started at the basic frequency with the frequency instructed to the variable frequency power supply as a basic frequency.

  The fundamental frequency does not necessarily have to be a frequency that is output to the variable frequency power source in order to ensure a necessary suction flow rate in an average atmospheric pressure state without clogging the filter of the filter box. However, according to the present invention, the filter in the filter box is not clogged, and the energy consumption for driving the motor is maximized by setting the frequency instructed to the variable frequency power supply in the state of average atmospheric pressure as the basic frequency. Can be achieved.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the control unit drives the alarm means when the state in which the frequency value instructed to the variable frequency power supply is higher than the fundamental frequency continues. A command signal is output.

  If the state where the fiber waste is accumulated in the filter box is left, the instruction frequency to the variable frequency power supply becomes higher than the fundamental frequency in order to secure a necessary suction flow rate. When this state continues, energy consumption for driving the motor increases. In this invention, if the state of the frequency value instructed to the variable frequency power source continues to be higher than the fundamental frequency, the alarm means is driven, so that the operator needs to remove the fiber waste accumulated in the filter box. Recognize that this is likely and take the necessary action.

  According to the present invention, it is possible to provide a pneumatic device for a spinning machine that can achieve energy saving of a motor in a state in which the reliability of the pneumatic device is ensured without providing a sensor for detecting the flow velocity and pressure in the suction duct. it can.

(A) is a schematic diagram of the filter box part vicinity, (b) is a partial schematic plan view of a suction duct. The block diagram which shows an electrical structure. The graph which shows the relationship between a frequency, suction | attraction flow volume, and electric power used.

Hereinafter, an embodiment in which the present invention is embodied in a single nozzle type pneumatic apparatus of a spinning machine will be described with reference to FIGS.
As shown in FIG. 1A, a filter box 13 of a pneumatic device 12 is disposed at an end portion on the out-end side of the spinning machine 11. The filter box 13 is partitioned by a filter 14 into a housing part 13a in which fiber waste and the like are stored, and a chamber 13b in which a blower 15 equipped with a fan 15a is housed. A suction air flow is generated in the filter box 13 by driving the blower 15. A three-phase AC motor is used as the motor 16 of the blower 15. At the position corresponding to the accommodating portion 13a of the filter box 13, an outlet for taking out fiber waste such as cotton dust captured by the filter 14 from the accommodating portion 13a is formed. 17.

  The suction duct 18 of the pneumatic device 12 extends along the longitudinal direction of the spinning machine 11, and the first end thereof is connected to the filter box 13. As shown in FIG. 1 (b), a single type suction nozzle 19 having one suction port 19a is connected to the suction duct 18 at a predetermined pitch. A hole for securing an air flow rate for conveying the fleece sucked from the suction nozzle 19 to the filter box 13 at the time of yarn breakage at the end opposite to the end connected to the filter box 13 of the suction duct 18. (Not shown) is formed. Further, a warning lamp 20 as an alarm means is provided on the out-end side of the spinning machine 11 (the right side in FIG. 1A).

  As shown in FIG. 2, the motor 16 is supplied with electric power from an inverter 21 as a variable frequency power source, and the inverter 21 is controlled by a control device 22 as a control unit. Note that the control device 22 is configured to control not only the inverter 21 but also the spinning machine. The control device 22 includes a CPU 23 and a memory 24. The memory 24 stores various control programs necessary for driving the motor 16 and various data, maps or relational expressions necessary for the execution.

  As a control program, there is a control program for instructing the frequency to the inverter 21 so that the power supplied to the motor 16, that is, the output power of the inverter 21, becomes a target value. As a control program, there is a control program for measuring the output power of the inverter 21. The CPU 23 functions as an output power measuring unit that measures the output power of the inverter 21. The CPU 23 also functions as a control unit that instructs the inverter 21 on the output frequency so that the measurement value of the output power measurement unit becomes the target value. In this embodiment, the CPU 23 calculates the output power based on the detection signal of the current detector 25 that detects the current supplied from the inverter 21 to the motor 16. The current detector 25 is provided between the inverter 21 and the motor 16, and the current detector 25 is a two-phase (U in this embodiment) of the three-phase currents Iu, Iv, and Iw supplied to the motor 16. Currents Iu and Iw of the phase and W phase) are detected.

  The relational expression stored in the memory 24 includes a suction flow rate (hereinafter referred to as a pneumatic flow rate) of the filter box 13 required from the number of spindles of the spinning machine 11 and the spun yarn weight (weight per unit length of spun yarn). There is also a relational expression for calculating. The relational expressions include a relational expression between the pneumatic flow rate and the power consumption of the motor 16 and a relational expression between the pneumatic flow rate and the fundamental frequency. In this embodiment, the frequency indicated to the inverter 21 in a state where the filter box 13 is clean, that is, the filter 14 of the filter box 13 is not clogged and is in an average atmospheric pressure is used as a basic frequency. The average atmospheric pressure state means, for example, a state in which the average atmospheric pressure of the environment in which the spinning machine 11 is installed is taken.

  The CPU 23 starts the operation of the motor 16 at the fundamental frequency with the frequency instructed to the inverter 21 as the fundamental frequency. Thereafter, while measuring the output power of the inverter 21, the CPU 23 feedback-controls the instruction frequency to the inverter 21 so that the output power becomes the target power obtained from the relationship with the calculated required pneumatic flow rate. That is, the target value when the CPU 23 controls the inverter 21 is set in relation to the pneumatic flow rate.

Next, the operation of the apparatus configured as described above will be described.
The pneumatic device 12 is driven from a state where the filter 14 is not clogged. Prior to the operation of the spinning machine 11, spinning conditions are set in the control device 22, and the spinning machine 11 is operated under this spinning condition. The CPU 23 calculates a required pneumatic flow rate from the number of spindles of the spinning machine 11 and the spun yarn weight, obtains a basic frequency from the calculated pneumatic flow rate, and starts control of the inverter 21 at the basic frequency, that is, starts the operation of the motor 16. To do. The motor 16 is supplied with electric power capable of ensuring a necessary pneumatic flow rate from the inverter 21.

  When the motor 16 is driven, the fan 15a is rotated, the inside of the filter box 13 becomes negative pressure, and a suction air flow from the suction duct 18 toward the filter box 13 is generated. A suction action is generated in each suction nozzle 19 by the action of the suction air flow, and an air flow from the hole toward the filter box 13 flows. The fluff attached to the fleece and the fleece sent out from the draft device when the yarn breaks are sucked by the suction nozzle 19 and are carried to the filter box 13 along the airflow toward the filter box 13 through the suction duct 18. And the fiber wastes, such as fluff conveyed to the filter box 13, are captured by the filter 14 and stored in the accommodating portion 13a. When fiber waste has been stored to some extent in the storage portion 13a, the operator opens the door 17 and performs an operation of taking out the fiber waste in the storage portion 13a. There is no problem even if the fiber waste is taken out while the spinning machine 11 is in operation.

  The CPU 23 inputs the detection signal of the current detector 25 at a predetermined cycle after the operation of the motor 16 is started, and calculates (measures) the output power of the inverter 21 based on the detection signal. And the frequency instruct | indicated to the inverter 21 is set so that this electric power becomes the target electric power calculated | required from the relationship with a pneumatic flow rate, a frequency is instruct | indicated to the inverter 21, and the inverter 21 is feedback-controlled. Therefore, even if the pressure and flow velocity in the suction duct 18 are not detected by the sensor, the suction flow rate (pneumatic flow rate) of the suction air flow toward the filter box 13 is maintained at an appropriate value while suppressing wasteful energy consumption. The Further, unlike the case where the pressure or flow velocity in the suction duct 18 is detected by a sensor to estimate the pneumatic flow rate, it is difficult to be affected by disturbances such as an increase in cotton dust and a change in atmospheric pressure.

The relationship between the frequency (indicated by X) of the inverter 21 and the pneumatic flow rate (indicated by Y) or the electric power used by the motor 16 (indicated by Z) is as shown in FIG. In FIG. 3, the solid line indicates the case where the filter box 13 is clean, and the broken line indicates the case where the filter box 13 has fiber waste. When the target flow rate is Y ₀ , Y ₁ , Y ₂ , the frequency of the inverter 21 in which the corresponding filter box 13 is clean becomes X _0-1 , X _1-1 , X _2-1 , and the filter box 13 has fiber waste. The frequency of the inverter 21 in the state where there is is X _0-2 , X _1-2 , X _2-2 .

For example, when the target flow rate is Y2, the frequency of the inverter 21 to obtain the flow rate is X _2-1 when the filter box 13 is clean, and X _2-2 when the filter box 13 has fiber waste. . The electric power used by the motor 16 when the filter box 13 is clean and the frequencies X _2-1 and X _2-2 are Z _2-1 and Z _2-2 , respectively. Conventionally, so as not to fall below the pneumatic flow target flow Y ₂ even in a state in which there is lint, during operation was always drives the motor 16 at a frequency X _2-2. On the other hand, in this embodiment, the motor 16 is driven at the frequency X _2-1 corresponding to the target flow rate Y ₂ when the filter box 13 is clean. Therefore, if the frequency of the inverter 21 with respect to the target flow rate is set on the basis of the clean state of the filter box 13 and the inverter 21 is controlled at that frequency, the amount of energy consumption reduced, that is, the energy saving power is ( _Z2-1 )-( _Z2-2 ).

  If the state in which the fiber waste is accumulated in the filter box 13 is left as it is, the output power decreases as the pneumatic flow rate decreases even if the filter box 13 is driven at the same frequency as shown by the dotted line in FIG. The control device 22 detects this decrease from the output power measurement value, and instructs the inverter 21 to increase the frequency from the fundamental frequency in order to compensate for this decrease in output power. The control device 22 continues the frequency increase control until the output power measurement value matches the target value. However, if the CPU 23, that is, the control device 22, continues the increase control of the instruction frequency to the inverter 21 for a predetermined period (for example, several minutes), the fiber waste has accumulated to such an extent that the required pneumatic flow rate cannot be secured by the frequency increase control. It is estimated that a command signal for turning on the warning lamp 20 is output, and the warning lamp 20 is turned on. When the operator confirms that the warning light 20 is turned on, the operator recognizes that there is a high possibility that the fiber waste collection operation is necessary, confirms the state of the filter box 13, and performs the collection operation if fiber waste collection is necessary. Do.

According to this embodiment, the following effects can be obtained.
(1) In the pneumatic device 12, the suction duct 18 is connected to the filter box 13 that generates a suction airflow by driving the blower 15, and power is supplied from the inverter 21 to the motor 16 that drives the blower 15. The motor 16 is controlled by the control device 22 via the inverter 21. The control device 22 instructs the frequency to the inverter 21 so that the output power measurement unit (CPU 23) that measures the output power of the inverter 21 and the measurement value of the CPU 23 become the target value. Therefore, energy saving of the motor 16 can be achieved in a state in which the reliability of the pneumatic device 12 is ensured without providing a sensor for detecting the flow velocity and pressure in the suction duct 18.

  (2) The output power measuring unit (CPU 23) calculates the output power of the inverter 21 based on the detection signal of the current detector 25 that detects the current supplied from the inverter 21 to the motor 16. In general, the inverter 21 is equipped with a current detector 25 that detects a current output from the inverter 21 in order to prevent an overcurrent from flowing through the motor 16 when the motor 16 is controlled. The output power of the inverter 21 is calculated based on the detection signal of the device 25. Therefore, the output power of the inverter 21 can be measured without newly providing a sensor for power measurement.

  (3) The target value is set in relation to the suction flow rate (pneumatic flow rate) of the filter box 13. Therefore, it is easy to grasp from the output power of the inverter 21 whether the pneumatic flow rate is in an appropriate state, and it is easy to appropriately carry out energy saving.

  (4) Applied to the pneumatic device 12 of the spinning machine 11, the CPU 23 calculates the pneumatic flow rate from the number of spindles of the spinning machine 11 and the spun yarn weight (weight per unit length of spun yarn). In the spinning machine 11, the pneumatic flow rate necessary for performing an appropriate suction action is determined by the number of spindles and the weight of the spun yarn. Therefore, the CPU 23 can perform control based on an appropriate suction flow rate necessary for energy saving.

  (5) The CPU 23 starts the control of the inverter 21 at the fundamental frequency with the filter 14 in the filter box 13 not clogged and the frequency instructed to the inverter 21 in an average atmospheric pressure state as the fundamental frequency. The fundamental frequency does not necessarily need to be a frequency output to the inverter 21 in order to ensure a necessary suction flow rate in an average atmospheric pressure state without clogging the filter 14 of the filter box 13. However, the filter 14 of the filter box 13 is not clogged, and the energy consumption for driving the motor 16 is maximized by setting the frequency instructed to the variable frequency power supply in the state of average atmospheric pressure as the basic frequency. can do.

  (6) When the frequency value instructed to the inverter 21 continues to be higher than the fundamental frequency, the CPU 23 outputs a command signal for driving the warning lamp 20. Therefore, the operator can recognize that there is a high possibility that it is necessary to remove the fiber waste accumulated in the filter box 13 by visually confirming the lighting of the warning lamp 20, and can take necessary measures.

The embodiment is not limited to the above, and may be configured as follows, for example.
The control device 22, that is, the CPU 23 is not limited to the case where the filter 14 is not clogged and the frequency instructed to the inverter 21 in the state of average atmospheric pressure is set as the fundamental frequency. For example, the operation of the motor 16 is started with the frequency instructed to the inverter 21 as a fundamental frequency in a state where the filter 14 is somewhat clogged, and thereafter, this power secures the pneumatic flow rate while measuring the output power of the inverter 21. Therefore, the instruction frequency to the inverter 21 may be set so that the target electric power (target value) is obtained. In this case, unlike the case where the filter 14 is not clogged and the frequency instructed to the inverter 21 is set to the fundamental frequency in the state of average atmospheric pressure, the energy consumption for driving the motor 16 can be achieved to the maximum. Although not possible, energy saving of the motor 16 can be achieved with the reliability of the pneumatic device 12 secured.

  The output power measuring unit is not limited to measuring (calculating) the output power of the inverter 21 based on the detection signal of the current detector 25 that detects the current supplied from the inverter 21 to the motor 16. For example, the torque of the motor 16 may be measured by a sensor, and the output power of the inverter 21 may be measured (calculated) based on the value.

A cycloconverter that directly converts three-phase AC power into AC power of another frequency and voltage may be used as a variable frequency power supply instead of the inverter 21.
○ Instead of a configuration in which the operator collects the fiber waste collected in the storage portion 13a as the filter box 13, the storage portion 13a is connected to a duct connected to a central cotton collecting apparatus provided in a spinning factory via a connection portion. In addition, an electromagnetic opening / closing device that opens and closes the communication path is provided at the connecting portion. Then, the CPU 23 may output a command signal for opening the switchgear when the frequency value instructed to the inverter 21 continues to be higher than the fundamental frequency. In this case, fiber waste or the like stored in the storage portion 13a is sucked into the duct, and the operator does not need to collect fiber waste.

  ○ The lighting control of the warning lamp 20 as an alarm means is not a simple one in which the warning lamp 20 is turned on when the frequency value instructed to the inverter 21 is higher than the basic frequency. The lighting state of the warning lamp 20 may be changed depending on the state. For example, the warning light 20 is blinked when the collection of the fiber waste is necessary at an early stage from the degree of the high state and the duration, and the warning light 20 is continuously turned on when the collection of the fiber waste is simply required. To do. Moreover, you may make it the structure which distinguishes a lighting state by providing two with a different lighting color as the warning light 20 as an alarm means.

O Without providing an alarm means, an operator may periodically check the state of the filter box 13 and collect fiber waste.
The suction nozzle 19 may be applied to a pneumatic device 12 having a so-called flute type suction nozzle having a pipe having a plurality of suction ports formed at the same pitch as the weight.

  ○ Not limited to spinning machines, for example, applied to a pneumatic device of a spinning device that manufactures special yarns called slab yarns or design yarns where the thickness of the spun yarn is not constant and the thickness is partially thick. May be. Also in this case, the suction duct 18 becomes long as in the case of the spinning machine. Moreover, you may apply to the pneumatic apparatus of a spinning machine with a short suction duct like a drawing machine.

  Iu, Iv, Iw ... current, 12 ... pneumatic device, 13 ... filter box, 14 ... filter, 15 ... blower, 16 ... motor, 18 ... suction duct, 20 ... warning light as alarm means, 21 ... as variable frequency power supply Inverter, 22 ... Control device as control unit, 23 ... CPU as output power measuring unit, 25 ... Current detector.

Claims (6)

A suction duct for sucking fluff and fiber waste generated in a spinning machine is connected to a filter box that generates a suction airflow by driving a blower, a motor that drives the blower, and a variable frequency power supply that supplies power to the motor In the pneumatic equipment of a spinning machine having
An output power measuring unit for measuring the output power of the variable frequency power supply;
A spinning machine pneumatic apparatus comprising: a control unit that instructs the variable frequency power supply to set a frequency so that a measurement value of the output power measurement unit becomes a target value.   The spinning machine pneumatic device according to claim 1, wherein the output power measuring unit calculates the output power based on a detection signal of a current detector that detects a current supplied from the variable frequency power source to the motor.   The pneumatic apparatus of the spinning machine according to claim 1 or 2, wherein the target value is set in association with a suction flow rate of the filter box.   The spinning device according to claim 3, wherein the spinning machine is a spinning machine, and the controller calculates the suction flow rate from the number of spindles of the spinning machine and the weight of the spun yarn.   The control unit starts control of the variable frequency power supply at a basic frequency with a frequency instructed to the variable frequency power supply in a state of an average atmospheric pressure as a basic frequency without clogging a filter of the filter box. A pneumatic apparatus for a spinning machine according to any one of claims 1 to 4.   The spinning device according to claim 5, wherein the controller outputs a command signal for driving an alarm means when a state in which a value of a frequency instructed to the variable frequency power supply is higher than the fundamental frequency continues.

Images