JPH0779788B2 - Vacuum cleaner - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to vacuum cleaners.

2. Description of the Related Art Generally, an electric vacuum cleaner has a structure as shown in FIG. In FIG. 6, the elbow 3 connected to the hand portion 1 and the hose 2 is inserted into the intake port 5 installed in the cleaner body 4, and the extension pipe 6 connected to the hand portion 1 is connected to the nozzle 7. When the power cord 8 is plugged into a household outlet and the hand switch 1a of the hand portion 1 is turned on, the motor 9 built in the cleaner body 4 rotates, and dust is sucked into the cleaner body 4 through the nozzle 7 and the hose 2. Then cleaning is done. Also, when cleaning is finished, the hand switch 1a of the hand unit 1
Is turned off, the rotation of the motor 9 is stopped, and the vacuum cleaner is stored.

Problems to be Solved by the Invention However, when cleaning work is performed using a vacuum cleaner, there are cases in which it is inadvertently forgotten to turn off the hand switch 1a due to another urgent business or the like. Then,
The vacuum cleaner will continue to operate unattended,
When the nozzle intake port is blocked and the airtight state is closed, the intake air is completely lost, and the safety of the product is impaired due to abnormal heating of the motor and accompanying abnormal temperature rise of each part. There is also a problem that there is a high risk that flammable materials may be blown into the fire or the fire itself may be blown.

The present invention solves the above problems, and an object thereof is to provide an electric vacuum cleaner in which the motor automatically stops even if a person leaves without turning off the hand switch during the cleaning work. It is a thing.

Means for Solving the Problems In order to solve the above-mentioned problems, the first means of the present invention is a light emitting section that emits light, receives light from the light emitting section, and outputs a signal according to the amount of light received. A light-receiving part, a light-blocking part provided between the light-emitting part and the light-receiving part so that the light-receiving part transmits or blocks light to change the signal of the light-receiving part, and a signal from the light-receiving part. A motor control unit for controlling the operation of the motor, and a structure for advancing / retreating the barrier according to the hose state detecting means for detecting the state of the hose which is not on the floor surface when in use and is on the floor surface when not in use. It was done.

Further, the second means of the present invention is to provide a light emitting unit which emits light, a light receiving unit which receives light from the light emitting unit and outputs a signal according to the amount of received light, and between the light emitting unit and the light receiving unit. A blocking object that is swingably provided and changes the signal of the light receiving unit by transmitting or blocking the light of the light emitting unit, a time measuring unit that measures time by a signal from the light receiving unit, and a time that sets a reference time It is equipped with a setting unit, a time comparing unit for comparing the time setting unit and information of the time setting unit, and a motor control unit for controlling the operation of the motor by receiving a signal from the time comparing unit. In the unused state, the barrier is advanced and retracted according to a hose state detecting means for detecting the state of the hose on the floor.

Further, a third means of the present invention is configured by incorporating the light emitting portion, the light receiving portion and the blocking object in the hose hand operation portion in the above means.

Action With the above-described configuration, when the state of the obstacle changes due to the hose of the vacuum cleaner being placed on the floor, a motor stop signal is sent to the motor control unit, and the motor stops its operation. Alternatively, even if the hose of the vacuum cleaner is placed on the floor and a person leaves, if the time measured by the time measuring unit exceeds the time preset in the time setting unit, a motor stop signal is sent to the mower control unit. The motor stops its operation. As a result, it is possible to prevent abnormal heating of the motor, abnormal temperature rise of each part, and various dangers due to exhaust.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit block diagram of an electric vacuum cleaner according to a first embodiment of the present invention. In FIG. 1, reference numeral 11 denotes a light emitting section that emits light, and uses, for example, an infrared LED. Reference numeral 12 denotes a light receiving portion that receives this light, and uses, for example, a photodiode. In addition, 13 is a blocker whose state changes according to the state of the hose, for example, as shown in FIGS.
A and liquid 13b are enclosed in a case 13c. 1
A motor controller 4 controls the motor 9 according to a signal from the light receiver 12, and normally operates the motor 9.

The light emitting unit 11, the light receiving unit 12, and the blocker 13 are incorporated in the proximal portion of the hose. The relationship between the blocker 13 and the hose state and the signal of the light receiving unit 12 resulting therefrom are further described with reference to FIG. explain. When cleaning with a hose,
Since the hand switch 1a is used so as to face upward, at this time, since the blocker 13 has the bubble 13a on the top surface side as shown in FIG. 3 (a), the infrared light from the light emitting unit 12 is liquid. The light receiving unit 12 is blocked by 13b and does not reach the light receiving unit 12, and the light receiving unit 12 is in the OFF state. At this time, the motor control unit 14 causes the motor 9
Is operating. However, if a person puts the hose on the floor in an attempt to leave, the hand switch 1a will be turned sideways or downward due to the elasticity of the hose, and the blocker 13 will move the bubble 13a as shown in Fig. 3 (b). The infrared light from the light emitting unit 11 passes through the bubbles 13a of the blocker 13 and reaches the light receiving unit 12, and the light receiving unit 12 is turned on. The ON signal of the light receiving unit 12 causes the motor control unit 14 to drive the motor. Stop 9 As a result, it is possible to prevent various risks due to abnormal heating of the motor, abnormal temperature rise of each part, and exhaust.

Although a combination of bubbles and liquid is used here as the blocker, small balls or a rigid body may be used.

FIG. 4 is a circuit block diagram of the vacuum cleaner of the third embodiment of the present invention. In FIG. 4, 11 to 13 are the same as those in FIG. 1, and therefore their explanations are omitted. 15 has a light receiving part
When the time is ON, the time measuring unit that measures time, 16 is a time setting unit that presets the maximum value of the time to be measured, the time comparing unit 17 compares the information of the time measuring unit 15 and the time setting unit 16, and The time measured by the measuring unit 15 is the time setting unit 16
If it is shorter than the set time set in, "motor ON signal"
Is output for a long time, a "motor OFF signal" is output. A motor controller 18 controls the motor 9 according to a signal from the time comparator 17.

FIG. 5 is a waveform diagram for explaining the operation of the block diagram of FIG. The signal of the light receiving section 12 outputs the OFF signal as shown in FIG. 5 (a) during the cleaning work as in FIG. 3 (a).
When the person leaves, the state shown in FIG.
The ON signal is output as shown in Fig. 5 (b).
Start time measurement as in. If the measured time is less than the set time set in the time setting unit 16, the time comparing unit 17 outputs a "motor ON signal" to the motor control unit 18 as shown in FIG. Remains ON as shown in FIG. 5 (d). However, when the measured time exceeds the set time, the time comparison unit 17 outputs a "motor OFF signal" to the motor control unit 18 as shown in Fig. 5 (c), and the motor 9 is shown in Fig. 5 (d). Turn off like. Therefore, when a person releases the hose for a certain period of time, the motor automatically stops.

Effects of the Invention According to the present invention, when the state of the barrier is changed by releasing the hand from the hose in order to perform another work during the cleaning work, the motor is automatically stopped or the cleaning work is performed. Even if a person leaves without turning off the hand switch inadvertently, the motor will automatically stop after the time set in the time setting section elapses. It can prevent the danger.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of the electric vacuum cleaner according to the first embodiment of the present invention, and FIGS. 2 (a) and 2 (b) are blockers of the electric vacuum cleaner.
A perspective view and a partial cross-sectional side view showing the structures of the light emitting portion and the light receiving portion, FIGS. 3 (a) and 3 (b) are state diagrams of an obstacle during operation, and FIGS. FIG. 6 is a circuit block diagram of the electric vacuum cleaner of the embodiment of the present invention and its operation explanatory view, and FIG. 6 is a general external view of the electric vacuum cleaner. 9 ... Motor, 11 ... Light emitting part, 12 ... Light receiving part, 13 ... Blocker, 13a ... Bubble, 13b ... Liquid, 13c ... Case, 15
…… Time measuring unit, 16 …… Time setting unit, 17 …… Time comparing unit, 14,18 …… Motor control unit.

Claims (3)

[Claims] 1. A light emitting portion which emits light, a light receiving portion which receives light from the light emitting portion and outputs a signal in accordance with the amount of received light, and a swingably provided between the light emitting portion and the light receiving portion. It includes a blocker that transmits or blocks the light of the light emitting part to change the signal of the light receiving part, and a motor control part that controls the operation of the motor by the signal from the light receiving part. An electric vacuum cleaner that advances and retracts the barrier according to a hose state detecting means for detecting the state of the hose on the floor when not in use. 2. A light emitting section which emits light, a light receiving section which receives light from the light emitting section and outputs a signal in accordance with the amount of received light, and a swingably provided between the light emitting section and the light receiving section. A blocker that transmits or blocks the light of the light emitting unit to change the signal of the light receiving unit, a time measuring unit that measures time by a signal from the light receiving unit, a time setting unit that sets a reference time, and this time A time comparison unit that compares the information of the setting unit and the time setting unit,
It is equipped with a motor control unit that receives the signal from this time comparison unit and controls the operation of the motor, and according to the hose state detection means that detects the state of the hose that is not on the floor surface when in use and on the floor surface when not in use. An electric vacuum cleaner that advances and retracts the barrier. 3. The electric vacuum cleaner according to claim 1, wherein the light emitting portion, the light receiving portion, and the barrier are incorporated in the hose hand operation portion.