JPH0685758B2 - Vacuum cleaner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an electric vacuum cleaner provided with a rotary brush for cleaning a carpet.

(Prior Art) Generally, in this type of vacuum cleaner, as shown in FIG. 4, for example, a cleaner body (2) having an intake port (1) and an elbow (3) on the base end side are provided. And a hose (5) provided with a hand switch (4) on the tip side and an extension tube (6)
In addition, the floor suction device (7) is provided, and at the time of use, the elbow (3) is inserted into the intake port (1), and the floor suction device (7) is inserted into the hose (5) through the extension pipe (6). 7) is connected and assembled, while the power cord (8) provided on the cleaner body (2) is plugged into an outlet for household AC power, and the hand switch (4) is turned on, the cleaner body ( The suction motor (9) built into 2) starts to rotate,
Floor suction tool (7) to extension tube (6) and hose (5)
The dust on the surface to be cleaned is sucked into the cleaner body (2) via the.

By the way, in recent years, a vacuum cleaner capable of efficiently cleaning a carpet surface has been demanded due to a remarkable change in living environment due to westernization. To meet this demand, the floor suction device (7)
In addition, it is widely used that a rotary brush (10) for knocking out dust in the deep part of the carpet surface and a brush drive motor (12) for driving the rotary brush (10) via a belt (11) are built in. With such a rotating brush, the rotating brush (10) is rotated by the brush driving motor (12), and even the dust in the deep part of the carpet is struck by the superposition friction between the brush and the carpet surface. Take it out and inhale.

Further, the brush drive motor (12) normally forms a circuit in series with the household AC power supply (13) when connected to the AC power supply (13), as shown in FIG.

In an electric vacuum cleaner having such a configuration, conventionally, when cleaning a carpet, a brush driving motor continuously rotates during the cleaning to knock out dust in a deep portion.

(Problems to be Solved by the Invention) By the way, what is important in carpet cleaning is the hammering out action of dust in the deep part of the carpet, and in order to make the rotating brush (10) perform the hammering out action, It is more effective to give a strong rotating torque than to rotate the rotating brush (10) at a high speed.

However, in the type in which the rotary brush (10) is continuously rotated as in the above-mentioned conventional example, even if dust on the carpet surface can be sucked, dust in the deep portion cannot be easily knocked out and sucked.

For this reason, it is possible to equip the floor suction device with a motor having a large rotational torque. However, in this case, the motor (12) becomes large and the floor suction device (7) inevitably becomes bulky.
Since the weight becomes large, it is difficult to commercialize the product, and it is impossible to clean the carpet with high efficiency.

The present invention has been made in order to solve the above-mentioned conventional problems, and a high-torque can be generated by a relatively small motor that is not different from the conventional one, so that the carpet is small and lightweight, but is also small. It is an object of the present invention to provide an electric vacuum cleaner that can knock out even deep dust by suction.

(Means for Solving Problems) A technical means of the present invention for achieving the above object is a motor for driving a rotary carpet cleaning brush, and an intermittent operation section for outputting a signal for intermittently operating the motor. A continuous operation section that outputs a signal for continuously operating the motor; a dust detection section that detects dust and outputs the signal to the continuous operation section; and a signal that receives signals from the intermittent operation section and the continuous operation section. The motor drive unit for intermittently or continuously operating the motor is operated by the signal output of the continuous operation unit when the dust detection unit detects dust, and the dust detection unit detects dust. If not, it operates by the signal output of the intermittent operation unit.

(Operation) According to the above configuration, when no dust is detected by the dust detection unit, a signal is output from the intermittent operation unit to the motor, the motor is intermittently operated, high torque is generated, and a deep carpet is generated. Can knock out dust. The dust that has been knocked out is detected by the dust detection unit, the detection signal is output from the continuous operation unit, the motor continuously rotates at high speed, and the dust is efficiently sucked.

(Example) Hereinafter, one example of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a block circuit diagram of an electric vacuum cleaner according to an embodiment of the present invention. In this figure, elements having the same functions as those in FIGS. The description is omitted.

In FIG. 1, (14) is an intermittent operation part, which sets ON time and OFF time for intermittently operating the brush driving motor (12). (15) is a motor drive unit, which is an intermittent operation signal (ON signal or ON signal output from the intermittent operation unit (14).
The OFF signal) drives the motor (12) intermittently. Reference numeral (16) is a continuous operation section, which outputs an ON signal for continuously operating the motor (12) to the motor drive section (15). Reference numeral (17) is a dust detection unit that detects dust struck by the rotational drive of the rotary brush (10) and outputs a detection signal to the continuous operation unit (16).

FIG. 2 shows an example of a circuit diagram showing a concrete configuration of each of the above parts, and FIG. 3 shows waveforms of each part of the circuit diagram of FIG. 2, and further description will be given with reference to these drawings. , The power supply voltage of the AC power supply (13) is half-wave rectified by the capacitor (C1), Zener diode (D1), diode (D2), and resistor (R1), and the DC voltage is obtained from this waveform. (18)
Is a timer IC, which is used here as an astable multivibrator, and its ON and OFF times have the potential charged in the capacitor (C2) by the resistor (R2) and the timer IC (18) itself. It is determined by the correlation with the reference potential.

That is, during the time (t ₁ ) when the capacitor (C2) is being charged through the resistor (R2), the output of the timer IC (18) becomes'H 'level, the transistor (TR1) is ON, and the bidirectional The motor (12) is driven because the thyristor (SCR) also turns on. (T _{0 to} T ₁ and T _{2 to} T ₃ ) When the charge potential of the capacitor (C2) reaches the first reference potential preset in the timer IC (18), the charge of the capacitor (C2) is discharged. To start. At this time (t ₂ ),
The output becomes'L 'level and the transistor (TR1) is OF
F, bidirectional thyristor (SCR) also turned off, motor (12)
Will stop. (T _{1 to} T ₂ and T _{3 to} T ₄ ) When the discharge of the capacitor (C2) progresses and reaches the second reference potential preset in the timer IC (18), charging is performed and the motor (12 ) Is driven again.

In this way, the motor (12) is repeatedly started and stopped, but a large inrush current flows at the moment when the motor (12) is started, so that a large output can be obtained. Therefore, a high torque can be obtained at the time of starting, and the dust in the deep part of the carpet can be knocked out sufficiently.

The dust thus blown out is sucked into the cleaner body (2) through the floor suction device (7), the extension pipe (6) and the hose (5), and the dust detection unit ( 17) is provided. The specific operation of the dust detector (17) is to irradiate the passage through which dust is emitted with the light emitted by the emitting diode (D3), and to place the light receiving photodiode (D4) facing the emitting diode (D3). It is provided to receive the light of the light emitting diode (D3). When dust passes through the passage,
The light from the light emitting diode (D3) is blocked by dust, and the amount of light received by the light receiving photodiode (D4) decreases and the light is turned off. Conversely, if there is no dust in the passage, the light-receiving photodiode (D4) will be the light-emitting diode (D3).
It is turned on by the light of.

Now, if there is no dust, the photo diode (D4) is on, so the transistor (TR2) is off, and the bidirectional thyristor (SCR) is repeatedly turning on and off as described above.
However, if there is dust, the photo diode (D4) will be turned off, so the transistor (TR2) will remain on, and the bidirectional thyristor (SCR) will remain on regardless of the operation of the transistor (TR2). For motors (12)
Performs continuous operation (time _{T 3, T 5 ~T 8)} .

As a result, the motor (12) is a continuous operation state in _{(T 4) ~ (T 9} ). When the dust is gone, the motor (12) repeats ON / OFF again.

That is, even the dust in the deep part of the carpet is knocked out by the intermittent operation, and the hammered dust can be easily sucked by automatically returning to the continuous operation by detecting the hammered dust.

(Effect of the invention) According to the present invention, the motor performs intermittent operation,
Even if the motor has the same output, high torque can be obtained at the time of starting the motor.Therefore, even if a motor with a large output is not used, dust in the deep part of the carpet can be knocked out sufficiently, By detecting and automatically switching to continuous operation, it is possible to obtain an excellent effect that efficient carpet cleaning can be performed by easily sucking dust blown out from the deep part of the carpet to the surface. .

[Brief description of drawings]

FIG. 1 is a block diagram of an electric vacuum cleaner according to an embodiment of the present invention,
FIG. 2 is a circuit diagram showing an example of its concrete structure, FIG. 3 is a waveform diagram of each part of the circuit diagram of FIG. 2, FIG. 4 is a perspective view showing a general vacuum cleaner, and FIG. FIG. 3 is a circuit diagram of a floor suction tool of a conventional electric vacuum cleaner. (10) …… Rotating brush, (12) …… Motor, (14) ……
Intermittent operation part, (15) …… Motor drive part, (16) …… Continuous operation part, (17) …… Dust detection part.

Claims (1)

[Claims] 1. A motor for driving a rotary brush for cleaning a carpet, an intermittent operation section for outputting a signal for intermittently operating the motor, a continuous operation section for outputting a signal for continuously operating the motor, and dust detection. And a dust detection unit that outputs the signal to the continuous operation unit, and a motor drive unit that receives signals from the intermittent operation unit and the continuous operation unit to intermittently or continuously operate the motor, wherein the motor drive unit An electric vacuum cleaner that operates by the signal output of the continuous operation unit when dust is detected by the dust detection unit, and operates by the signal output of the intermittent operation unit when dust is not detected by the dust detection unit.