JP2010155302A - Dust collector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To control the drive of a dust collector motor 20 interlocking with the operational status of the body 40 of an electric tool 200 without the influence of a subsidiary device 50 included in the electric tool 200 connected to an electric outlet 11. <P>SOLUTION: An interlock controller 30 measures current passing through the electric outlet 11 during operation of the electric tool 200, and a voltage value of an alternate power supply, and then discriminates the operational status of the body 40 of the electric tool 200 by calculating an effective value and a form factor of the current of the electric outlet from these measured values, and by comparing them with their respective threshold values. The interlock controller controls the operation (drive/stop) of the dust collector motor 20 based on the discrimination result. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dust collector having a function of supplying power to an external power tool or other device.

  Patent Document 1 and the like describe a dust collector for an electric tool that includes an outlet and has a function of supplying power from the outlet to an electric tool to be collected.

  Among these types of dust collectors for electric tools, there are those that determine the operating state of the electric tool and control the operation of the dust collecting motor based on the operating state. Specifically, it is determined whether or not the power tool is in operation based on the magnitude of the current (outlet current) supplied from the outlet to the power tool. When not in operation, the dust collection motor is controlled to OFF.

JP 2000-246672 A

  Some electric power tools include an accessory device having a semiconductor circuit such as a hand lamp or an inking laser light source. In this type of accessory device, a relatively large current flows for several milliseconds when the phase of the power supply voltage is in the vicinity of 90 ° and 270 °, and the peak current is substantially equal to the no-load current of the power tool body. For this reason, when a power tool equipped with such an accessory device is connected to the outlet of the dust collector for the power tool and only the accessory device is turned on, the dust collector for the power tool misclassifies that the power tool body is in operation, There is a possibility of turning on the dust motor.

  The present invention has been made in view of the above problems, and provides a dust collector capable of controlling the drive of a dust collecting motor in conjunction with the operating state of an electric tool main body without being affected by an accessory device. With the goal.

In order to achieve the above object, a dust collector according to the first aspect of the present invention comprises:
A dust collector having a function of supplying power to an external power tool,
An outlet for supplying power to the external power tool;
A dust collection motor drive means for controlling the drive of the dust collection motor of the dust collector for electric tools;
Parameter acquisition means for measuring a current supplied from the outlet to the power tool connected to the outlet, and obtaining a predetermined parameter of the current waveform;
Discrimination of outputting an ON signal to the dust collection motor drive means when the parameter acquired by the parameter acquisition means satisfies a predetermined condition, and outputting an OFF signal to the dust collection motor drive means when the predetermined condition is not satisfied Means,
It is comprised from these.

  The predetermined condition is preferably a condition in which the parameter indicates that at least the motor of the motor and accompanying equipment provided in the external power tool is in operation.

  The parameter may include a parameter indicating a distortion of a current flowing through the outlet.

The parameter includes a parameter indicating an effective value and a waveform rate of the current flowing through the outlet,
The predetermined condition may be that an effective value of a current flowing through the outlet exceeds a predetermined threshold and a waveform rate is equal to or lower than a predetermined threshold.

The parameter includes a parameter indicating an effective value and a crest factor of the current flowing through the outlet,
The predetermined condition may be that an effective value of a current flowing through the outlet exceeds a predetermined threshold and a crest factor is equal to or lower than a predetermined threshold.

  The parameter acquisition means may determine a parameter of a half wave region of the current flowing through the outlet.

  The parameter acquisition means sets a predetermined interval in the current waveform for acquiring the parameter to eliminate the influence of the current flowing in the semiconductor circuit included in the external power tool from the current flowing in the outlet, and in the predetermined interval Means for obtaining a parameter of the current may be provided.

  The parameter acquisition means may acquire a parameter for a current in a predetermined section where the phase of the power supply voltage applied to the outlet includes 180 degrees and a predetermined section including 360 degrees.

The parameter obtaining means obtains a parameter corresponding to the magnitude of the current for a predetermined section including a phase of the power supply voltage applied to the outlet including 180 degrees and a predetermined section including 360 degrees,
The discrimination means may output an ON signal when the magnitude of the current indicated by the parameter exceeds a predetermined threshold value.

  ADVANTAGE OF THE INVENTION According to this invention, the drive of a dust collection motor can be controlled in response to the driving | running state of an electric tool main body, without being influenced by an incidental apparatus.

(First embodiment)
The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is an external view showing a power tool dust collector 100 according to a first embodiment of the present invention and a power tool 200 connected to an outlet 11 of the power tool dust collector 100. In the present embodiment, the power tool is an electric circular saw and will be described below.

  A hose 300 is connected to the suction port 110 of the power tool dust collector 100. The tip of the hose 300 is connected to a suction port 210 of an electric circular saw that is the electric tool 200.

  The power tool dust collector 100 operates by receiving power from an external AC power source (commercial power source) (not shown) such as a home AC power source. The power cable 220 of the electric tool 200 is connected to an outlet 11 provided on the operation panel 10 of the electric power tool dust collector 100, and the electric tool 200 operates by receiving electric power supplied from the outlet 11.

  The power tool dust collector 100 is turned on / off in conjunction with the turning on / off of the power tool 200, and collects dust such as dust to be cut and ground dust generated when the power tool 200 processes a workpiece from the hose 300. Dust.

  FIG. 2 shows a circuit configuration diagram of the power tool dust collector 100 and the power tool 200 connected to the power tool dust collector 100.

  The power tool dust collector 100 includes an operation panel 10, a dust collection motor 20, and an interlock control unit 30.

  The operation panel 10 is a panel on which switches and the like operated by the user are installed and exposed to the outside. On the operation panel 10, an outlet 11, a power switch 12, and an interlock / single action switch 13 are arranged.

  A power plug of the electric tool 200 is connected to the outlet 11 to supply electric power to the electric tool 200. In this embodiment, as shown in FIG. 1, the electric power tool 200 is an electric circular saw.

  The power switch 12 is a switch for switching on / off the power supply to the dust collector 100 for the electric power tool.

  The interlock / single action switch 13 is a switch for switching the operation mode of the power tool dust collector 100 between the interlock mode and the single action mode.

  When the operation mode is the single action mode, the dust collecting motor 20 of the power tool dust collector 100 is in a driving state when the power switch 12 is turned on regardless of the value of the current flowing through the outlet 11 (outlet current).

  When the operation mode is the interlocking mode, the dust collection motor 20 of the power tool dust collector 100 is in a drive state or a stop state according to the value of the outlet current even when the power switch 12 is in an ON state.

The dust collection motor 20 rotates a dust collection fan (not shown).
When the dust collecting fan rotates, the power tool dust collector 100 collects dust generated by the operation of the power tool 200 via the hose 300. Further, in the single mode, the dust collection motor 20 is driven when the power switch 12 is on and stops when it is off. On the other hand, in the interlocking mode, driving / stopping is controlled by a signal from a dust collection motor driving circuit 32 of the interlocking control unit 30 described later.

  The interlock control unit 30 determines the operating state of the main body 40 of the electric power tool 200 based on the value of the current flowing through the outlet 11 (outlet current), and operates (drives / stops) the dust collection motor 20 in conjunction with the determined operating state. ) To control. The interlock control unit 30 includes an operation mode detection circuit 31, a dust collection motor drive circuit 32, a power supply voltage detection circuit 33, an outlet current detection circuit 34, a microcomputer 35, a DC power supply 36, a power transformer 37, A memory 38 and a current transformer CT are provided.

  The operation mode detection circuit 31 detects the operation mode selected by the interlock / single action selector switch 13 (on / off of the interlock / single action selector switch 13), and provides information indicating the detected operation mode of the microcomputer 35. Output to the digital input port P00.

  The dust collection motor drive circuit 32 controls the operation (drive / stop) of the dust collection motor 20 based on an instruction signal from the digital output port D 0 of the microcomputer 35.

  The power supply voltage detection circuit 33 detects the voltage value of the AC power supply that is the power supply of the power tool dust collector 100. Then, the power supply voltage detection circuit 33 outputs a signal indicating the detected voltage value to the analog input port Ain1 of the microcomputer 35.

  The outlet current detection circuit 34 is connected to the secondary side of the current transformer CT that detects the value of the outlet current, and outputs a signal indicating the current value detected by the current transformer CT to the analog input port Ain0 of the microcomputer 35.

  The microcomputer 35 calculates an effective value and a waveform rate (effective value / average value) of the outlet current by interruption processing every time when a half of the power cycle of the AC power supply elapses, and stores it in the memory 38. Record. Details of the process will be described later.

  Further, as a main process (main routine), the microcomputer 35 compares the effective value and the waveform rate recorded in the memory 38 with the threshold value, and based on the comparison result, the dust collecting motor driving circuit 32 supplies the dust collecting motor. The process (Dust collection motor control process) which transmits the instruction | indication signal which instruct | indicates 20 drive / stop from digital output port D0 is performed. Details of the dust collection motor control process will be described later.

  The DC power source 36 is a power circuit that converts AC power supplied from the AC power source into DC power that can be used by each unit of the interlock control unit 30 and outputs the DC power.

  The memory 38 stores a program for operating the microcomputer 35 and various fixed data. The memory 38 stores the effective value of the outlet current and the waveform rate in real time. The memory 38 stores in advance a threshold value Ier for determining the effective value of the outlet current and a threshold value Ifr for determining the waveform rate, which are used in the dust collection motor control process.

  Next, a circuit configuration of the electric power tool 200 connected to the electric power tool dust collector 100 will be described. The electric power tool 200 includes a main body 40 and an accompanying device 50.

  The main body 40 is a part that functions as a tool for processing a workpiece. The main body 40 includes a series commutator motor 41 and a power switch 42.

  The series-winding commutator motor 41 is an electric motor that operates with electric power supplied from the outlet 11 and serves as a power source for processing a workpiece of the electric tool.

  The power switch 42 is a switch for switching on / off the power of the electric tool.

  The auxiliary device 50 is a device having a function of assisting the main body 40. In the present embodiment, the auxiliary device 50 will be described as a light. The auxiliary device 50 includes a DC power supply device 51, a laser light generator 52, and an auxiliary switch 53.

  The DC power supply device 51 is a power supply circuit that converts alternating current power supplied from the outlet 11 into direct current that can be used by each unit of the auxiliary device 50 and outputs the direct current. The DC power supply device 51 includes, for example, a diode full bridge circuit and a smoothing circuit. The full bridge circuit full-wave rectifies the input AC voltage and outputs a pulsating voltage. The smoothing circuit smoothes the pulsating current output from the full bridge circuit and outputs a constant voltage. Since the full bridge circuit is composed of diodes, the current flows from the AC power source to the DC power source 36 only when the voltage phase of the AC power source is around 90 ° and 270 ° and the absolute value of the voltage value is relatively large. .

  The laser light generation device 52 is configured by, for example, an LED (Light Emitting Diode) having a semiconductor circuit or the like, and receives direct current power from the DC power supply device 51 to emit light, thereby assisting the user's work. Since the laser beam generator 52 includes a semiconductor circuit, it forms a distorted current waveform whose crest value is higher than the effective value compared to a sinusoidal current waveform of a motor or the like.

  The auxiliary switch 53 is a switch for switching the auxiliary device 50 on and off.

  Next, the operation of the interlock control unit 30 of the power tool dust collector 100 will be described in detail.

  When the power tool dust collector 100 is connected to an AC power source and the power switch 12 is turned on, power is supplied to the interlock control unit 30. Then, after the restart process (initialization) is completed, the microcomputer 35 executes the process of calculating and storing the current value and the waveform rate of the outlet current for each half cycle of the AC power supply voltage by the interrupt process. .

  Specifically, the microcomputer 35 includes the current value of the outlet current input to the analog input port Ain0 via the current transformer CT and the outlet current detection circuit 34, and the analog input port Ain1 via the power supply voltage detection circuit 33. The voltage value of the AC power source input to is associated with information indicating the current time and is continuously stored in the memory 38 at predetermined minute time intervals (for example, 0.2 milliseconds). With this processing, the current waveform of the outlet current and the voltage waveform of the AC power supply are recorded in the memory 38.

  Then, for example, the microcomputer 35 monitors the change in the voltage of the AC power source stored in the memory 38, and changes the voltage after the noise removal processing from the positive polarity to the negative polarity or from the negative polarity to the positive polarity. Timing, that is, a zero cross point is detected. In response to the detection of the zero cross point, the microcomputer 35 halves the latest AC power supply cycle (the phase is 0 ° to 180 ° or 180 ° to 360 °: 10 mm when the frequency of the AC power supply is 50 Hz). Current value (instantaneous value) stored in (second) is read from the memory 38.

Then, the microcomputer 35 based on the read current value (instantaneous value) I 1 _~I n _(n is the number of samples), the effective value Ie outlet current half cycle, the average value Ia, the form factor If for example Calculate according to the following formula.
Ie = (√ (ΣI _i ² ) / n) (i = 1 to n)
Ia = | (ΣI _i ) / n | (i = 1 to n)
If = Ie / Ia

  Through the above processing, the effective value Ie and the waveform rate If of the outlet current are continuously recorded (updated) in the memory 38 in real time.

  Next, a dust collection motor control process that is a main process (main routine) of the microcomputer 35 will be described.

  When the power switch 12 is turned on, the microcomputer 35 executes the dust collection motor control process shown in FIG. 3 at a predetermined time interval (for example, every 1 second).

  When the dust collection motor control process is started, the microcomputer 35 determines whether or not the current operation mode is the interlock mode based on a signal input from the operation mode detection circuit 31 to the digital input port P00. (Step S11).

  When it is determined that the current operation mode is not the interlock mode (that is, the single action mode) (step S11; No), the dust collection motor 20 is always in an operating state with the power on, and the dust collection motor control process is finish.

  When it is determined that the current operation mode is the interlocking mode (step S11; Yes), the microcomputer 35 reads the current outlet current effective value Ie and the waveform rate If from the memory 38 (the previous half cycle) ( Step S12).

  Subsequently, the microcomputer 35 determines that the effective value Ie of the read outlet current is equal to or greater than the threshold value Ier for determining the effective value (Ie ≧ Ier), and the waveform rate If is equal to or less than the threshold value Forr for determining the waveform rate (If ≦ Ifr). ) Is determined (step S13).

  The microcomputer 35 determines that the effective value Ie of the outlet current is not less than the threshold value Ier for determining the effective value and the crest factor If is not more than the threshold value Ifr for determining the waveform rate (Ie ≧ Ier and If ≦ Ifr). In the case (step S13; Yes), it is determined that the power tool 200 is in operation, and an instruction signal (ON signal) indicating that the dust collecting motor 20 is driven is transmitted from the digital output port D0 to the dust collecting motor driving circuit 32. (Step S14). In response to an instruction from the microcomputer 35, the dust collection motor drive circuit 32 controls the dust collection motor 20 to an operating state.

On the other hand, the microcomputer 35 determines that the effective value Ie of the outlet current is less than the threshold value Ier for determining the effective value (Ie <Ier), or the waveform rate If is greater than the threshold value Ifr for determining the waveform rate (If> Ifr). If it is determined (step S13; No), it is determined that the power tool is stopped, and an instruction signal (off signal) indicating that the dust collection motor 20 is stopped is transmitted from the digital output port D0 to the dust collection motor drive circuit 32. (Step S15). In response to an instruction from the microcomputer 35, the dust collection motor drive circuit 32 controls the dust collection motor 20 to be stopped after several seconds.
It should be noted that the interval of several seconds is provided from when the instruction of the off signal of the microcomputer 35 is received until the dust collecting motor 20 is controlled to be stopped. The dust collecting motor 20 is not interrupted after the instruction of the off signal. This is to prevent dust or the like during dust collection from remaining in the hose 300 when the operation is stopped.

  When the microcomputer 35 transmits an instruction signal to the dust collection motor drive circuit 32 (steps S14 and S15), the dust collection motor control process is completed.

  As described above, the power tool dust collector 100 according to the embodiment of the present invention controls the operation (drive / stop) of the dust collection motor 20 based on the effective value and the crest factor of the outlet current.

  Then, the operation | movement of the dust collector 100 for electric tools is demonstrated concretely, exemplifying the electric current waveform of outlet current. FIG. 4A is a diagram showing a current waveform of the outlet current when only the main body 40 of the electric power tool 200 operates in a no-load state. As the load increases, the current value gradually increases. Next, FIG. 4B is a diagram showing a current waveform of the outlet current when only the auxiliary device 50 of the electric power tool 200 is operated.

  From the current waveforms shown in these figures, the outlet current at the time of no load of the main body 40 and the outlet current at the time of operation of the auxiliary device 50 are substantially equal, but the outlet current at the time of operation of the auxiliary device 50 is more It can be seen that the waveform rate is larger than the outlet current during operation of the main body 40.

  Therefore, in the conventional method of determining the operating state of the electric tool 200 only by the effective value of the outlet current, when only the auxiliary device 50 of the electric tool 200 is operating, the effective value of the outlet current is the operating value of the main body 40. Therefore, it is determined that the main body 40 of the electric power tool 200 is in a driving state. And the dust collection motor 20 will be controlled by the drive state.

  On the other hand, in the present embodiment, the operating state of the electric power tool 200 is determined in consideration of the waveform rate, which is a parameter indicating the distortion of the current waveform, in addition to the effective value. Therefore, when the main body 40 is stopped and only the auxiliary device 50 is driven, the effective value of the outlet current is similar to that when the main body 40 is driven, but the crest factor is Since it takes a high value, it is determined that the main body 40 of the electric power tool 200 is in a stopped state. And the dust collection motor 20 is controlled to a stop state. Therefore, the dust collector 100 for an electric tool according to the present embodiment can control the dust collection motor 20 in conjunction with the operation state of the electric tool 200 main body without being influenced by the driving of the auxiliary device 50 of the electric tool 200. it can.

  In addition, this invention is not limited to the said embodiment, A various deformation | transformation and application are possible.

  For example, in the above embodiment, the operation (drive / stop) of the dust motor 20 is controlled by comparing the effective value of the outlet current and the waveform rate, which is a parameter indicating the distortion of the current waveform, with a threshold value. However, not only the waveform rate, but also a crest factor (maximum value / effective value) which is a parameter indicating waveform distortion may be used.

In this case, for example, the microcomputer 35 receives the current value of the outlet current input to the analog input port Ain0 via the current transformer CT and the outlet current detection circuit 34, and the analog input port Ain1 via the power supply voltage detection circuit 33. The voltage value of the AC power source input to is associated with information indicating the current time and is continuously stored in the memory 38 at predetermined minute time intervals (for example, 0.2 milliseconds). The microcomputer 35 monitors, for example, a change in the voltage of the AC power source stored in the memory 38 and detects a zero cross point. In response to the detection of the zero cross, the microcomputer 35 halves the latest AC power supply cycle (phase is 0 ° to 180 ° or 180 ° to 360 °: 10 milliseconds when the frequency of the AC power supply is 50 Hz). ) Is read from the memory 38. Then, the microcomputer 35 reads the current value (instantaneous value) I 1 _~I n _(n is the number of samples) absolute value among the selected maximum one as maximum value Im, further half cycle outlet The effective value Ie of the current is obtained, and the crest factor Ip is obtained according to the following equation.
Ip = | Im | / Ie

Through the above processing, the effective value Ie and the crest factor Ip of the outlet current are continuously recorded (updated) in the memory 38 in real time.
A threshold Ipr for discriminating the crest factor is stored in the memory 38 in advance. In the dust collection motor control process, the microcomputer 35 determines that the effective value Ie is not less than the threshold value Ier for determining the effective value (Ie ≧ Ier), and the crest factor Ip is not more than the threshold value Ipr for determining the crest factor (Ip). It is determined whether or not ≦ Ipr).
When the effective value Ie is not less than the threshold value Ier for determining the effective value and the crest factor Ip is not more than the threshold value Ipr for determining the crest factor (Ie ≧ Ier and Ip ≦ Ipr), the microcomputer 35 is connected to the dust collection motor drive circuit 32. Send on signal. In other cases, that is, when the effective value Ie is less than the threshold value Ier for determining the effective value or the crest factor Ip is greater than the threshold value Ipr for determining the crest factor (Ie <Ier or Ip> Ipr), the microcomputer 35 An off signal is transmitted to the motor drive circuit 32.

(Second Embodiment)
In the above-described embodiment, on / off of the main body 40 is determined using parameters (waveform rate, crest factor, etc.) indicating the degree of distortion on the assumption that the current waveform is distorted by the semiconductor circuit. The present invention is not limited to this.

  As described above, the DC power supply device 51 includes the diode bridge circuit, and the absolute value of the power supply voltage in the vicinity of the phase of the power supply voltage of 180 ° and 360 ° is relatively small as shown in FIG. In the region, almost no current flows through the auxiliary device 50.

  Therefore, if the outlet current is measured at a timing when no current flows through the auxiliary device 50, only the current flowing through the main body 40 can be detected without being affected by the auxiliary device 50, and the series-winding commutator motor 41 is detected. Can be accurately detected.

Hereinafter, operation | movement of the dust collector 100 for electric tools of such a structure is demonstrated.
In this case, as in the first embodiment, the microcomputer 35 associates the current value of the outlet current and the voltage value of the AC power source with information indicating the current time, and performs a predetermined minute time (for example, 0.2 mm). (Second) intervals and continuously stored in the memory 38. With this processing, the current waveform of the outlet current and the voltage waveform of the AC power supply are recorded in the memory 38.

  Then, for example, the microcomputer 35 monitors the change in the voltage of the AC power source stored in the memory 38, and changes the voltage after the noise removal processing from the positive polarity to the negative polarity or from the negative polarity to the positive polarity. Timing, that is, a zero cross point is detected. The zero cross point is a point whose phase is 180 ° or 360 °. Next, the microcomputer 35 sets a predetermined period (for example, 50 ° to 20 °) before and after, as indicated by a rectangular wavy line in FIG. 4D, using the detected zero cross point as a reference. That is, for example, a period in which the phase is 130 ° to 230 ° or 310 ° to 410 ° (when 50 °) and the phase is 160 ° to 200 ° or 340 ° to 380 ° (when 20 °) is set.

  Next, the microcomputer 35 obtains the effective value of the current within the set period, and compares the obtained effective value with the threshold for determining the effective value set in the memory 35 in advance.

  When the microcomputer 35 determines that the calculated effective value is equal to or greater than the threshold value, the microcomputer 35 determines that a current is flowing through the main body 40 and that the main body 40 is operating, and causes the dust collecting motor drive circuit 32 to Send on signal. If the microcomputer 35 determines that the calculated effective value is less than the threshold value, the microcomputer 35 determines that no current flows through the main body 40 and that the main body is stopped, and causes the dust collecting motor drive circuit 32 to Send off signal.

  Thus, in the present embodiment, by setting a period in which no current flows through the auxiliary device 50 and measuring a parameter (effective value) indicating the magnitude of the outlet current in the period, Only the current flowing through the main body 40 can be detected without being affected by the auxiliary device 50, and the on / off of the series commutator motor 41 can be accurately detected.

  The parameter indicating the magnitude of the current is not limited to the effective value, but may be an average value (however, an average value of the absolute value of the current), a total value (however, a total value of the absolute value of the current), or the like. In either case, a corresponding threshold value is set.

  Further, when the series commutator motor 41 is phase-controlled, a distorted current waveform as shown in FIG. Even in this case, by setting an appropriate effective value and a threshold value of the waveform rate (or crest factor), the current waveform during operation of the incidental device 50 formed in a pulse shape in FIG. Therefore, it is possible to control the operation of the dust collection motor 20 in conjunction with the operation state of the main body 40 that is not affected by the accessory device 50.

  Moreover, this invention is applicable not only to the dust collector 100 for electric tools used for an electric tool but to the dust collector used for the apparatus which generate | occur | produces other dust.

  In addition, this invention is not limited to the said embodiment, A various change is possible within the range which does not deviate from the summary.

It is the external view which showed the dust collector for electric tools which concerns on this embodiment, and the electric tool connected to this dust collector for electric tools. It is a circuit block diagram of the said dust collector for electric tools, and an electric tool. It is a flowchart of a dust collection motor control process. It is the figure which showed the electric current waveform of the outlet current at the time of electric tool operation | movement.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100: Dust collector for electric tools 10: Operation panel 20: Dust collection motor 30: Interlocking control part 31: Operation mode detection circuit 32: Dust collection motor drive circuit 33: Power supply voltage detection circuit 34: Outlet current detection circuit 35: Microcomputer 36 : DC power source 37: Power transformer 38: Memory CT: Current transformer 200: Electric tool 40: Main body 41: Series commutator motor 42: Power switch 50: Auxiliary device 51: DC power device 52: Laser light generator 53: Auxiliary switch

Claims (9)

A dust collector having a function of supplying power to an external power tool,
An outlet for supplying power to the external power tool;
A dust collection motor drive means for controlling the drive of the dust collection motor of the dust collector for electric tools;
Parameter acquisition means for measuring a current supplied from the outlet to the power tool connected to the outlet, and obtaining a predetermined parameter of the current waveform;
Discrimination of outputting an ON signal to the dust collection motor drive means when the parameter acquired by the parameter acquisition means satisfies a predetermined condition, and outputting an OFF signal to the dust collection motor drive means when the predetermined condition is not satisfied Means,
Dust collector characterized by comprising. The predetermined condition is a condition in which the parameter indicates that at least the motor is operating among the motor and accompanying equipment provided in the external power tool.
The dust collector according to claim 1. The parameter includes a parameter indicating distortion of current flowing through the outlet.
The dust collector according to claim 1 or 2, characterized by the above-mentioned. The parameter includes a parameter indicating an effective value and a waveform rate of the current flowing through the outlet,
The predetermined condition is that the effective value of the current flowing through the outlet exceeds a predetermined threshold and the waveform rate is equal to or lower than a predetermined threshold.
The dust collector of any one of Claims 1 thru | or 3 characterized by the above-mentioned. The parameter includes a parameter indicating an effective value and a crest factor of the current flowing through the outlet,
The predetermined condition is that the effective value of the current flowing through the outlet exceeds a predetermined threshold and the crest factor is equal to or lower than a predetermined threshold.
The dust collector according to any one of claims 1 to 4, wherein the dust collector is provided. The parameter obtaining means obtains a parameter of a half-wave region of the current flowing through the outlet;
The dust collector according to any one of claims 1 to 5, wherein the dust collector is provided. The parameter acquisition means sets a predetermined interval in the current waveform for acquiring the parameter to eliminate the influence of the current flowing in the semiconductor circuit included in the external power tool from the current flowing in the outlet, and in the predetermined interval Means for determining a parameter of the current;
The dust collector according to any one of claims 1 to 5, wherein the dust collector is provided. The parameter acquisition means acquires parameters for current in a predetermined section including a phase of 180 degrees and a predetermined section including 360 degrees of the power supply voltage applied to the outlet,
The dust collector according to any one of claims 1 to 7, wherein the dust collector is characterized in that The parameter obtaining means obtains a parameter corresponding to the magnitude of the current for a predetermined section including a phase of the power supply voltage applied to the outlet including 180 degrees and a predetermined section including 360 degrees,
The determination means outputs an ON signal when the magnitude of the current indicated by the parameter exceeds a predetermined threshold;
The dust collector according to any one of claims 1 to 7, wherein the dust collector is characterized in that

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