JP3132702B2 - Electric vacuum cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner for controlling an electric blower in a state set by operating means.

[0002]

2. Description of the Related Art In a conventional vacuum cleaner of this type, an electric blower and a control means for controlling the electric blower are provided in a main body of the vacuum cleaner, and a control means such as a hose connected to the main body of the vacuum cleaner is provided. Operating means is provided from the means via a two-wire transmission line.

[0003] The operating means controls, for example, the current value, and the control means controls the driving of the electric blower, such as on and off.

[0004]

However, in the conventional vacuum cleaner, when the input state of the electric blower is notified in accordance with the operation state of the operation means, the light emitting diode is turned on or off, the buzzer is sounded, or the like. The current value detected by the control means differs depending on the notification state such as silence. Therefore, when the control means changes the driving state of the electric blower by controlling the current value, the current value differs depending on the notification state even when the same operation is performed.

[0005] Therefore, when performing the notification, a storage means for storing a current value when the operation means is caused to perform the notification is required in the operation means, and there is a problem that the apparatus becomes complicated and expensive. . Further, when the cleaning is interrupted, the hose is likely to be subjected to an impact, for example, when the hose is placed on the floor, and the storage means may be damaged.

In order to perform the notification without using the storage means, the number of transmission lines from the control means must be increased.
There is a problem that the productivity of the hose is reduced and the weight is increased, and the cost of the hose is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an electric vacuum cleaner for notifying the driving state of an electric blower without making the apparatus complicated and expensive.

[0008]

According to a first aspect of the present invention, there is provided a vacuum cleaner including a main body for housing an electric blower, a base end detachably connected to the main body, a hand-operated operation portion provided at a front end, and a two-wire electric wire. A hose provided with, and operating means provided on the hand operating portion of the hose to set a driving state of the electric blower,
Control means provided in the main body, connected to the operating means via the two wires, and controlling the electric blower in a driving state of the electric blower set by the operating means, the operating means comprising: A resistance means for varying the current value stepwise with different resistance values according to the set driving state; a light emitting diode connected in series with the resistance means for at least turning on and off according to the set driving state; A diode connected in anti-parallel to the diode, wherein the control means includes a resistor connected to one of the light emitting diode and the diode.
And a constant voltage means for applying a constant voltage via the two wires, and switching a current direction from the constant voltage means in accordance with the set driving state, and in response to the set driving state. When the light emitting diode is turned off, the current direction is switched in the forward direction with respect to the diode to apply a voltage to the two-wire wire, and when the light emitting diode is turned on, the light emitting diode is turned off. Switching the current direction in the forward direction and applying a voltage to the two wires while applying a current in the forward direction to the light emitting diode in a pulse shape for a shorter time than the time for flowing the current in the forward direction. and current switching means for switching the voltage to the resistance means via a wire of the two-wire and the current direction is switched in the forward direction with respect to the this current switching means diode The applied stepwise variable current value by and a current detecting means for detecting through the wire of the two-wire, is detected by the current detection means and said resistance
The driving state of the electric blower is controlled in accordance with the current value set by the resistance means.

According to a second aspect of the present invention, there is provided a vacuum cleaner including a main body accommodating the electric blower, a hose having a base end detachably connected to the main body, a hand-operated portion provided at a distal end, and a two-wire electric wire; Operating means for setting the driving state of the electric blower, which is provided on the hand operating section of the hose , and which is connected to the operating means via the two-wire wire provided in the main body, and which is set by the operating means; and control means for controlling said electric blower on the driving state of the electric blower, the operation means includes a resistance means you stepwise variable the <br/> current at different resistance values according to the set driving condition A sounding means connected in series to the resistance means and having a current directionality capable of sounding according to the set driving state; and a current directionality connected in parallel to the sounding means and having a current direction opposite to the sounding means. Daio And a de, said control means, one of said sound generating means and a diode to the resistor <br/> means and
A constant voltage means for applying a constant voltage via the two electric wires; and a current direction from the constant voltage means for switching the current direction from the constant voltage means in a forward direction with respect to the sound generating means in accordance with the set driving state. Current switching for switching the current direction in a forward direction with respect to the diode in a pulse shape for a time shorter than the time for flowing a current in the forward direction to the sounding means while applying a voltage to the wire to cause the sounding means to sound. Means, and the current direction is switched in a forward direction with respect to the diode by the current switching means, and a voltage is applied to the resistance means via the two-wire wire to thereby change a stepwise variable current value. Current detecting means for detecting through the two electric wires, and setting by the resistance means detected by the current detecting means.
The driving state of the electric blower is controlled in accordance with the supplied current value.

[0010]

According to a first aspect of the present invention, in the vacuum cleaner, the control means includes:
From the constant voltage means through the two wires of the hose,
When the direction of the current of the constant voltage applied to the resistance means is displayed in a light-emitting diode in series with the resistance means in accordance with the driving state set by the current switching means, the anti-parallel to the light-emitting diode is When the current direction is switched in the forward direction with respect to the diode, and the light emitting diode is turned on and displayed in accordance with the set driving state, the diode is shaped like a pulse having a shorter time than the time in which the current flows in the forward direction to the light emitting diode. The current direction is switched in the forward direction with respect to the light emitting diode while the current direction is switched in the forward direction.
Pulsed forward voltage to the diode in a sufficiently short time.
If the current flows, the light emitting diode will be
While it looks like it is lit , the current direction is switched by the current switching means by the current detection means, and the current value in the forward direction is detected for the diode that is changed stepwise according to the drive state set by the resistance means, In order to control the driving state of the electric blower in accordance with the detected current value, the current detecting means corresponds to the setting operation by the resistance means even if the light emitting diode of the operating means is in the lighted state as well as in the off state. It is possible to control the electric blower by detecting the current value that does not pass through the light emitting diode, which can be changed in a variable manner, and with a simple configuration, regardless of whether the light emitting diode is turned on or off, the current value accurately set by the resistance means Detect.

According to a second aspect of the present invention, the control means controls the direction of the current of the constant voltage applied from the constant voltage means to the resistance control means of the operation means via the two wires of the hose.
In response to the driving state set by the current switching means, the sounding means having a current directivity in series with the resistance means is switched in the forward direction to the sounding means so that the sounding means is sounded. The current direction is switched in the forward direction to the diode in anti-parallel to the sounding means in a pulse shape shorter than the time for flowing the current in the forward direction, and the current is switched in the forward direction to the sounding means.
Forward to the diode in a time sufficiently shorter than the flow time
If the pulse-like current of
And the current direction is switched by the current switching means by the current detection means, and the current is switched forward by the stepwise variable diode according to the driving state set by the resistance means. In order to control the driving state of the electric blower in accordance with the detected current value, even if the sounding means of the operating means is in the mute state as well as the sounding state, the current detecting means is controlled by the resistance means. The electric blower can be controlled by detecting the current value that is changed stepwise according to the setting operation, and with a simple configuration, regardless of the sounding or mute of the sounding means, the current accurately set by the resistance means Detect the value.

[0012]

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

In FIG. 2, reference numeral 1 denotes a vacuum cleaner main body. A base end of a hose 2 is detachably connected to the vacuum cleaner main body 1, and a distal end of the hose 2 is branched backward. A hand operation unit 3 having a shape is provided. A suction port body 5 is attached to a tip of the hand operation unit 3 via a telescopic extension tube 4.

As shown in FIG. 3, the hand operating section 3 branches backward and has a free end at the grip.
11 and the upper surface of the hand operation unit 3 is extended
, A button 12 for a stop setting, a button 13 for an automatic setting, a button 14 for a weak / strong setting, a light emitting diode 15 and a button 16 for a power brush are sequentially arranged in a line. .

Next, the internal configuration will be described with reference to FIG.

First, an electric blower 21 provided in the vacuum cleaner main body 1 and a power brush 22 provided in the suction port body 5 are provided with power control triacs 23 and 24, respectively.
Is connected to the commercial AC power supply E via the. The gates of the triacs 23 and 24 are connected to control means 25 built in the vacuum cleaner main body 1.
Reference numeral 25 includes power supply means 26 as constant voltage means for applying a constant voltage, current switching means 27 for switching the direction of the current of the power output from the power supply means 26, and current detection means 28 for detecting the current. ing. Further, an operation means 29 is connected to the control means 25. The operation means 29 includes a button 12 for setting a stop, a button 13 for automatic setting, a button 14 for weak / strong setting, and a button 16 for power brush. resistance means for controlling the current in accordance with the operation 30, a light emitting diode 15 and a diode 31 connected in antiparallel to the light-emitting diode 15 for displaying in accordance with the driving state of the electric blower 21.

A part of the control means 25 and the operation means 29
Is as shown in FIG.

The control means 25 includes, in the microcomputer 32, the above-described power supply means 26, current switching means 27, and current detecting means 28.

The power supply means 26 outputs a constant voltage from the constant voltage three-terminal regulator 33 and the capacitor 34. The power supply means 26 includes a microcomputer 32
A switch 35 controlled by the terminal P1, a switch 36 controlled by the terminal P2, and a switch 37 controlled by the terminal P3. The switch 35 includes a power supply unit 26 and a current detection unit 28.
The switch 36 is intermittent between the operation means 29 and the ground, and the switch 37 is intermittent between the power supply means 26 and the operation means 29.
Intermittently.

The current detecting means 28 includes resistors 41, 42,
It is composed of 43 and capacitors 44 and 45, and detects the current value of the operating means 29.

Further, the control means 25 is connected to the operation means 29 via two-wire transmission lines 51 and 52 which are two wires . The operating means 29 has a current limiting resistor 56 connected between the two-wire transmission lines 51 and 52 via the light-emitting diode 15 and the diode 31 connected in anti-parallel. And
In parallel with the resistor 56, a series circuit of a normally closed switch 57 and a resistor 58 operated by a stop setting button 12 and a normally closed switch 59 and a resistor 60 operated by an automatic setting button 13 are connected. Button for series circuit, weak / strong setting
A series circuit of a normally closed switch 61 and a resistor 62 operated by 14 and a series circuit of a normally closed switch 63 and a resistor 64 operated by a power brush button 16 are connected. Note that the resistance values of the resistors 58, 60, 62, and 64 are set to different resistance values.

Next, the operation of the above embodiment will be described.

First, at normal times, the terminals P1 and P2 of the microcomputer 32 are set to the H level, the terminal P3 is set to the L level, and the switches 35 and 36 are turned off.
37 is turned on, and current flows in the direction A shown in FIG. In this state, current flows through the diode 31 and the light emitting diode 15
Turns off.

On the other hand, as will be described later, when the button 13 for automatic setting is operated, the terminals P1 and P2 of the microcomputer 32 are set to L level, the terminal P3 is set to H level,
The switch 35 and the switch 36 are turned on, and the switch 37 is turned off. The current flows in the direction B shown in FIG. 4 and the current flows through the light emitting diode 15, so that the light emitting diode 15 is turned on.

Then, as shown in FIGS. 5E and 5F, when the current flows in the direction A in a pulsed state while the light emitting diode 15 is on, the light emitting diode 15 is turned off. Also, as shown in FIG. 5C, the current direction is reversed in a pulsed manner by the current switching means 27, and as shown in FIG. 5F, the current flows in the A direction, and the light emitting diode 15 is turned off. If only the current sensing means 28 is a light emitting diode are
Since the current value not passing through 15 is detected, the current value of the applied voltage is constant, so that the threshold value can be fixed.

Next, a specific example will be described with reference to FIG.

First, the current detection means 28 detects the current at the pulse timing shown in FIG. 5 (g). If the detected current is 0, the two-wire transmission lines 51 and 52 are opened. Therefore, it is determined that the hose 2 is disconnected. Further, when the current is detected by current detector 28 that exceeds the threshold value i ₅ of the hose connection shown in FIG. 5 (c), as shown in FIG. 5 (d), the hose 2 is connected, the operating unit 29 Each button 12,
It is determined that 13, 14, and 16 have not been operated.

When the automatic setting button 13 is operated and the switch 59 is opened, the current value exceeds the threshold value i ₃ and becomes equal to or less than the threshold value i ₄ .
The current is detected by the current detecting means 28 at the timing shown in FIG. 5G, and as shown in FIG. 5A, the input of the electric blower 21 is controlled in correspondence with the automatic output. Then, the control unit 25 controls the triac 23 to control the electric blower 21.
At this time, the control means 25 determines that the button 13 for automatic setting has been operated, and as shown in FIG.
The current direction is switched from the direction A to the direction B at a pulse-like timing at which no current is detected by 27, and the light emitting diode 15 is turned on as shown in FIG.
Then, the current direction is reversed in a pulse manner by the current switching means 27, and the current is detected by the current detection means 28 in synchronization with the reversal of the current as shown in FIGS. 5 (f) and 5 (g).

Since this pulse-like reversal of the current is for a short time, the cleaning operator cannot recognize that the light emitting diode 15 has been turned off, and looks as if it has been turned on.

Further, when the switch 61 is operated button 14 for weak / strong setting is opened, the current value becomes the threshold value i ₃ following the current value exceeds the threshold value i _2, FIG. 5 a current value
At the timing shown in (g), the current is detected by the current detecting means 28, and as shown in FIG. 5 (a), the input of the electric blower 21 is reduced to a weak output and controlled. At this time, the current switching means
At 27, the current direction is switched from the B direction to the A direction, and the light emitting diode 15 is turned off as shown in FIG.

Furthermore, when the switch 61 is again the operated button 14 for weak / strong setting again is opened, similarly, the current value becomes the threshold value i ₃ following the current value exceeds the threshold value i _2, the current The value is detected by the current detecting means 28, and as shown in FIG. 5A, the input of the electric blower 21 is increased to a strong output and is controlled to correspond.

Further, beyond the switch 57 button 16 for power brush is operated is opened, the current value is the threshold value i ₁
Since the current value is equal to or smaller than the threshold value i ₂ , this current value is
At the timing shown in FIG. 5G, the current is detected by the current detecting means 28, and as shown in FIG. 5B, the power brush 22 is turned on.

[0033] When the switch 63 is operated button 12 for stop setting is opened, the current value becomes the threshold value i ₅ following current value exceeds the threshold value i _4, 5 the current value
At the timing shown in FIG. 5G, the current is detected by the current detecting means 28, the input of the electric blower 21 is stopped as shown in FIG. 5A, and the power brush 22 is turned off as shown in FIG. 5B. .

In the embodiment shown in FIGS. 1 to 5, the light emitting diode 15 is turned on when the button 13 for automatic setting is operated. However, the light emitting diode 15 may be turned on when dust is clogged. .

Next, another embodiment of the vacuum cleaner according to the present invention will be described with reference to FIGS.

In the embodiment shown in FIGS. 6 to 8, the sound emitting means 71 is used instead of the light emitting diode 15 shown in FIGS.
Is provided.

That is, as shown in the circuit of FIG. 7, the sounding means 71 includes a diode in a parallel circuit of a buzzer 72 and a resistor 73.
74 are connected in series, and have a current directivity so that a current flows only in the B direction, similarly to the light emitting diode 15 shown in FIG. Further, the diode 31 is connected to the sound generating means 71 so as to have a characteristic opposite to that of the diode 74.

In parallel with the resistor 56 of the operating means 29, a diode 75 is provided in the same direction as the forward direction of the diode 74 of the sound generating means 71.
Connect.

Next, the operation of the embodiment shown in FIGS. 6 to 8 will be described.

First, the microcomputer 32 normally operates.
The terminal P1 and the terminal P2 are set to the H level, the terminal P3 is set to the L level, and the switches 35 and 36 are turned off.
37 is turned on, and a current flows in the direction A shown in FIG. In this state, current flows through the diode 31 and the buzzer
Reference numeral 72 denotes a mute state, that is, a state in which no sound is generated.

Conversely, when the buttons 13, 14, 16 described later are operated, the terminals P1 and P2 of the microcomputer 32 are set to L level, the terminal P3 is set to H level, and the switches 35 and 36 are turned on. Then, the switch 37 is turned off, and a current flows in the direction B shown in FIG. Then, by the reversal of the current direction, the sound generating means 71
Current flows, and the buzzer 72 of the sound generator 71 sounds.

As shown in FIGS. 8 (e) and 8 (f), when a current flows in the direction A in a pulse-like state while the buzzer 72 is sounding, the buzzer shown in FIG. Is muted. Also, as shown in FIG. 8C, the current direction is reversed in a pulsed manner by the current switching means 27, and as shown in FIG. 8F, the current flows in the A direction and the buzzer 72 is muted. Only in this case, since the current detecting means 28 detects the current value not passing through the sound generating means 71, the current value of the applied voltage is constant, so that the threshold value can be fixed.

Note that, during one cycle in which the current flows in the direction A in the pulsed state shown in FIG. 5G, the cleaning operator cannot confirm that the buzzer 72 is muted because the time is short. Therefore, the sounding time of the buzzer 72 is as shown in FIG.
As shown in (f), for example, a control command for appropriately reversing the current is provided in advance by the microcomputer so that the cleaning worker can hear the sound of "beep".
Store it in 32.

Next, a specific example will be described with reference to FIG.

By operating the buttons 13, 14, 16 of the operating means 29, the current value is changed in the same manner as in the embodiment shown in FIG.
8 at the timing shown in FIG.
As shown in (a), the electric blower 21 and the power brush
The triac shown in FIG.
23 are controlled and set to predetermined states, respectively.

At this time, the current direction is changed to A by the current switching means 27.
The direction is switched from the direction B to the direction B, and the buzzer 72 of the sounding means 71 is sounded as shown in FIG. Then, the current direction is reversed in a pulsed manner by the current switching means 27, and FIG.
As shown in (g), the current is detected by the current detecting means 28 in synchronization with the reversal of the current.

After the current has been reversed for a predetermined time during which the cleaning operator can confirm the sound of the buzzer 72, the current direction is switched from the B direction to the A direction again, and the operation means 29 is in a standby state.

When the stop setting button 12 is operated, the current value is changed to the same value as in the embodiment shown in FIG.
At the timing shown in (g), the current is detected by the current detecting means 28, and control is performed to stop the input of the electric blower 21 and the power brush 22 as shown in FIGS. 8 (a) and 8 (b). Then, the current direction is switched from the direction A to the direction B by the current switching means 27,
The buzzer 72 of the sounding means 71 sounds for a predetermined time as shown in FIG. 8E, and the current switching means 27 as shown in FIG.
8 (f), (g).
As shown in FIG. 7, in synchronization with the reversal of the current, the current detection means 28 constitutes a standby state in which the current is detected by the operation of the next operation means.

In the embodiment shown in FIGS. 6 to 8, the buzzer 72 is sounded when each of the buttons 13, 14, 16 of the operating means 29 is operated. You can do it.

[0050]

According to the vacuum cleaner of the first aspect, the current direction is switched in the forward direction with respect to the light emitting diode in accordance with the set driving state, so that the light emitting diode is turned on and displayed. The current direction is switched in the forward direction with respect to the diode in a pulse shape shorter than the time in which the current flows in the forward direction, the current direction is switched by the current switching means by the current detection means, and the current is switched stepwise according to the driving state set by the resistance means. In order to control the driving state of the electric blower by detecting the forward current value of the diode in the changed reverse blocking state, the light emitting diode is supplied with the reverse blocking direction.
Even though the current flows, the light emitting diode appears to be lit
In addition, the current detection means detects the current value that does not pass through the light emitting diode even if the light emitting diode of the operating means is off or on, of course, so that the set current value can be kept constant and a simple configuration. Therefore, regardless of whether the light emitting diode is turned on or off, the current value set by the resistance means can be accurately detected, and even if the variation is large like a light emitting diode, the current can be accurately detected, and storage means and the like are not required. Therefore, an increase in cost can be suppressed.

According to the second aspect of the present invention, a current is caused to flow in the forward direction to the sounding means while switching the sounding means in the forward direction in accordance with the set driving state to cause the sounding means to sound. The current direction is switched in a pulse shape shorter than the time in the forward direction with respect to the diode in antiparallel to the sounding means, the current direction is switched by the current switching means by the current detection means, and the current is switched by the driving state set by the resistance means. In order to control the driving state of the electric blower by detecting the forward current value of the diode that is in the reverse blocking state that has been changed, the sound is generated even if the current in the reverse blocking direction is supplied to the sound generator.
It sounds like the means are sounding continuously,
Even if the sounding means of the operation means is in the mute state or the sounding state, the current value in the forward direction of the diode where no current flows in the sounding means is detected, so the set current value can be always kept constant and simple. With this configuration, the current value set by the resistance means can be accurately detected regardless of the sounding or mute of the sounding means, and even if the sounding means is used, the current can be accurately detected, and the storage means and the like are unnecessary. Therefore, an increase in cost can be suppressed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of a vacuum cleaner according to the present invention.

FIG. 2 is a perspective view showing an appearance configuration of the same.

FIG. 3 is a perspective view showing the same permission operation unit.

FIG. 4 is a circuit diagram showing a circuit configuration of the electric vacuum cleaner.

FIG. 5 is a timing chart showing the operation of the electric vacuum cleaner. (A) Waveform diagram showing the input of the electric blower (b) Waveform diagram showing the input of the motor of the power brush (c) Waveform diagram showing the current detected by the current detecting means (d) Waveform diagram showing the connection of the hose ( e) Waveform diagram showing lighting state of light emitting diode (f) Waveform diagram showing current direction (g) Waveform diagram showing detection timing of detection means

FIG. 6 is a block diagram showing another embodiment of the vacuum cleaner of the present invention.

FIG. 7 is a circuit diagram showing a circuit configuration of the electric vacuum cleaner.

FIG. 8 is a timing chart showing the operation of the electric vacuum cleaner. (A) Waveform diagram showing the input of the electric blower (b) Waveform diagram showing the input of the motor of the power brush (c) Waveform diagram showing the current detected by the current detecting means (d) Waveform diagram showing the connection of the hose ( e) Waveform diagram showing sounding state of buzzer of sounding means (f) Waveform diagram showing current direction (g) Waveform diagram showing detection timing of detecting means

[Explanation of symbols]

15 Light emitting diode 21 Electric blower 25 Control means 26 Power supply means as constant voltage means 27 Current switching means 28 Current detection means 29 Operating means 30 Resistance means 31 Diode 71 Sounding means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A47L 9/28

Claims (2)

(57) [Claims] 1. A main body accommodating an electric blower, a hose having a base end detachably connected to the main body, a hand-operated portion provided at a distal end, and a two-wire electric wire, and a hand-operated operation of the hose .
Operating means for setting the driving state of the electric blower provided in the unit , and driving state of the electric blower set in the main body and connected to the operating means via the two-wire electric wire and set by the operating means And control means for controlling the electric blower, wherein the operating means has different resistors according to the set driving state.
A variable resistance means a current value in a stepwise manner with anti-value, a light-emitting diode at least turned on and off the display in accordance with the set driving conditions are connected in series with the resistor <br/> means,
And a diode connected in antiparallel relative to the light-emitting diode, wherein, the light emitting diode Contact to the resistive means
And one of the diodes and the two wires
Te a constant voltage means for applying a constant voltage, in response to the set driving condition switching the current direction from the constant voltage means, when turning off the display of the light emitting diode in response to the set driving condition Switch the current direction in the forward direction with respect to the diode, apply a voltage to the two-wire wire, and switch the current direction in the forward direction with respect to the light emitting diode when the light emitting diode is lit and displayed. Current switching means for switching the current direction in the forward direction with respect to the diode in a pulse shape having a shorter time than the time in which the current flows in the light-emitting diode while applying a voltage to the two wires; stage by application of voltage to said resistance means via a wire of the two wire is switched current direction in the forward direction with respect to the diode switching means A variable current value and a current detecting means for detecting through the wire of the two-wire, the electric blower in response to a current value set by the resistance means detected by the current sensing means A vacuum cleaner characterized by controlling a driving state. 2. A hose for accommodating an electric blower, a hose having a base end detachably connected to the main body, a hand-operated portion provided at a distal end thereof, and a two-wire electric wire, and a hand-operated operation of the hose .
Operating means for setting the driving state of the electric blower provided in the unit , and driving state of the electric blower set in the main body and connected to the operating means via the two-wire electric wire and set by the operating means And control means for controlling the electric blower, wherein the operating means has different resistors according to the set driving state.
And resistance means you stepwise variable the current value at the anti-values, a sound generating means having a programmable current directional sound according driven state of being connected in series to the set to the resistance <br/> means, the pronunciation and a diode having an opposite current direction from said sound generating means connected in parallel with the means, the control means, said sound generating means and da said resistance means
Constant voltage means for applying a constant voltage through one of the electrodes and the two wires, and a current direction from the constant voltage means in a forward direction with respect to the sound generating means in accordance with the set driving state. And applying a voltage to the two wires to cause the sounding means to emit sound while causing the current to flow forward to the sounding means in a pulse shape shorter than the time for flowing the current in the forward direction to the diode. Current switching means for switching the direction, and the current switching means switches the current direction in the forward direction with respect to the diode, and the voltage is applied to the resistance means via the two-wire wire, thereby varying stepwise. and a current detecting means for detecting a current value through an electric wire of the two-wire, the current said detected by detecting means corresponding to the current value set by the resistance means driving like the electric blower Vacuum cleaner and controlling the.