JPS639849B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vacuum cleaner.

Generally, vacuum cleaners collect dust from the suction port using airflow from an electric blower built into the main body case. A rotating brush that touches the floor is installed at the suction port.
There is a device in which this rotating brush is rotated by an electric motor provided inside the main body case. This method makes it easy to collect dust near the suction port by cleaning while rotating a rotating brush in contact with the floor surface, and is suitable for cleaning carpets and the like. The electric blower and the electric motor are operated by turning on a power switch provided on the operating handle. Therefore, after the power switch is turned on, the rotating brush is always rotating, and if the vacuum cleaner body is stopped against the floor, it will continue to rotate in the same place, and it will damage the floor and carpet. It's something that can hurt. Conversely, when the power switch is turned on, the vacuum cleaner body must be constantly moved, and it is not possible to collect dust while it is stopped at a certain location.

The present invention has been made in view of the above points, and when the main body case is in a stopped state with respect to the floor, the current to the electric motor is automatically cut off to stop the rotation of the rotating brush. An object of the present invention is to provide a vacuum cleaner in which a rotating brush does not damage a floor surface or a carpet, and the rotation of the rotating brush does not stop frequently.

In the present invention, a rotating brush is provided facing the suction port formed in the main body case, and an electric motor that is connected to the rotating brush and rotates it is provided in the main body case, and the movement and stoppage of the main body case is detected. A detection section is provided to turn on/off by the operation of this detection section.
The present invention is characterized in that it is provided with an energization control section consisting of a switch that turns off and a timer circuit that cuts off the power to the motor after a certain period of time has elapsed from when the switch is turned off. Therefore, the detection section detects the movement or stoppage of the main body case, and the energization control section, which operates based on the signal from the detection section, turns on the rotating brush when the stoppage time has elapsed for a certain period of time set by the timer circuit. As a result, when the main body case is moved back and forth in use, the rotating brush can continue to rotate without having to stop frequently, and in the case of a long stop time, the rotation can be stopped. It is designed so that it will not stop and damage the floor or carpet.

A first embodiment of the present invention will be explained based on FIGS. 1 to 4. First, reference numeral 1 denotes a main body case in which an electric blower 2 is built-in, and this main body case 1 is movable by wheels 3. A suction port 4 is formed on the lower surface of the front side of the main body case 1, and a dust collecting section 5 is mounted inside the suction port 4. A communication port 6 is formed between the dust collecting section 5 and the electric blower 2. In addition, the suction port 4
A rotary brush 7 is rotatably provided nearby, with its lower part protruding and in contact with the floor surface. An electric motor 8 for rotating this rotating brush 7 is provided near the electric blower 2, and both are connected by a belt 9. Furthermore, an operation handle 10 that faces rearward and extends diagonally upward is connected to the rear side of the main body case 1. This operation handle 10
has a power switch 12 in its grip 11, and a cord 14 is wired along the operating handle 10, having a power plug 13 at one end and connected to the electric blower 2 and motor 8 at the other end. .

Thus, while the main body case 1 and the operating handle 10 are simply connected, a mounting portion 15 is provided for the wheel 3 on the rear side, and springs 18 and 19 are provided in guide recesses 16 and 17 of this mounting portion 15.
A two-circuit switch 2 is provided in which a wheel holder 23 serving as a detection unit is provided so as to be freely displaceable in the front-rear direction while holding the wheel 3 therebetween, and is closed by displacement of the wheel holder 23.
4 is provided.

Furthermore, as shown in FIG. 5, the electrical circuit basically consists of a power plug 13 and a power switch 12
There is an electric blower 2 and a motor 8 connected in parallel through a step-down transformer 25, and a timer circuit 26 serving as a power supply control section is provided on the motor 8 side via a step-down transformer 25. This timer circuit 26 and the wheel holder 23 constitute an energization control section. That is, step-down transformer 25
Rectifying diodes 27 and 28 are connected to the secondary side of the diodes 27 and 28, and Zener diodes 29 and 30 are connected between these diodes 27 and 28 and the grounded center tap, respectively. An operational amplifier 31 receiving operating voltage from these Zener diodes 29 and 30 is provided. Further, a resistor 32 and the two-circuit switch 24 are connected in parallel to the Zener diodes 29 and 30, and the midpoint thereof is connected to the negative input terminal of the operational amplifier 31 via the resistor 33. An integrating capacitor 34 is connected to the feedback circuit of the operational amplifier 31, and a series circuit of a resistor 35 and a two-circuit switch 24a interlocked with the two-circuit switch 24 is connected in parallel to the integrating capacitor 34. Also, a resistor 3 is connected to the output side of the operational amplifier 31.
6 is connected to the base of a transistor 37, and a parallel circuit of a resistor 38 and an electromagnetic switch 39 is connected to the collector side of the transistor 37. Here, the transistor 37 becomes conductive between the collector and the emitter when the base voltage becomes 0.6 V or more with respect to the emitter voltage. Further, the relay contact 40 of the electromagnetic switch 39
are connected in series to the electric motor 8.

In such a configuration, when the main body case 1 is moving, the wheel holder 23 receives a force in the opposite direction to the moving direction due to friction between the wheels 3 and the floor, and resists the spring 18 or the spring 19. It is displaced along the guide recesses 16 and 17. This closes the two-circuit switch 24. On the other hand,
When the main body case 1 is in a stopped state with respect to the floor surface, no force in the longitudinal direction acts on the wheel holder 23, so that the wheel holder 23 is returned to the neutral position by the sprigs 18 and 19. This opens the two-circuit switch 24.

Here, if the main body case 1 immediately changes from forward movement to backward movement or vice versa,
There is no need to stop the rotating brush 7. Therefore,
In this embodiment, unlike the previous embodiment, the main body case 1
A timer circuit 26 is provided to provide a certain amount of delay time from when the rotating brush 7 stops moving until the rotating brush 7 stops moving. That is, for example, if the main body case 1 changes from a moving state to a stopped state, the two-circuit switches 24 and 24a open. As a result, a positive power supply voltage is applied to the point A relative to the - input terminal of the operational amplifier 31, and the integrating capacitor 34 in the operational amplifier 31 is charged. On the other hand, the voltage at point B on the output side of the operational amplifier 31 drops to approximately the negative power supply voltage and remains at that voltage, so the transistor 37 is momentarily cut off and the relay contact 40 of the electromagnetic switch 39 is opened. . As a result, the power to the electric motor 8 is quickly cut off, and the rotation of the rotating brush 7 is stopped. In such an operation, it takes a certain amount of time for the voltage at point B to drop to 0.6V or less due to the charging time for the integral co-capacitor 34.
This time is the delay time from the stop of the main body case 1 to the stop of the electric motor 8, as shown in FIG. Therefore, if the stop is for a short time, the electric motor 8 is kept energized and the rotating brush 7 continues to rotate.

Further, when the main body case 1 changes from the stopped state to the moving state, the two-circuit switches 24 and 24a are closed. As a result, the potential at point A becomes a negative power supply voltage. On the other hand, the charged integrating capacitor 3
4 constitutes an inverting amplifier while being discharged through the resistor 35, and the potential at point B immediately becomes 0.6V or more, so the transistor 37 becomes conductive and the electromagnetic switch 39
Close the relay contact 40 of. As a result, the electric motor 8 is energized and the rotating brush 7 immediately starts rotating.

Next, a second embodiment of the present invention will be described based on FIG. This embodiment shows only the detection section, and the other structures are the same as those of the previous embodiment. First, two guide recesses 16 and 17 are formed in the front and rear of the mounting portion 15 on the side of the main body case 1, and these guide recesses 16 and 17 are made to be freely displaceable in the front and rear direction by springs 18 and 19 provided with the guide recesses 16 and 17. An operating handle 10 is fixed to a handle pedestal 20 serving as a detection section located at the center thereof.
Furthermore, a switch 24 is provided which is closed when the handle holder 20 moves forward or backward from the center position.

In such a configuration, the main body case 1 is moved back and forth via the handle 10, but at this time, the handle holder 20 is moved by the force from the handle 10.
moves forward or backward from the center position, switching the switch 24. As a result, the rotation of the rotary brush 7 is controlled in the same way as in the previous embodiment.

Since the present invention is configured as described above, the detection section detects the movement or stoppage of the main body case, and the energization control section, which operates based on the signal from the detection section, controls the stoppage time for a certain period of time set by the timer circuit. The rotating brush can be stopped when the period of In this case, the rotation is stopped and the floor surface or carpet is not damaged.

[Brief explanation of the drawing]

Fig. 1 is a vertical side view showing a first embodiment of the present invention, Fig. 2 is a longitudinal side view showing an enlarged view of the main parts, Fig. 3 is a circuit diagram, and Fig. 4 is a waveform diagram showing its operation. ,
FIG. 5 is a longitudinal sectional side view showing a second embodiment of the present invention. 1...Body case, 4...Suction port, 7...Rotating brush, 8...Electric motor, 20...Handle holder (detection part), 23...Wheel holder (detection part), 24
...Switch, 26...Timer circuit (energization control section).

Claims (1)

[Scope of Claims] 1. A rotating brush is provided facing the suction port formed in the main body case, and an electric motor connected to the rotating brush and rotating it is provided inside the main body case, and the motor is configured to move and rotate the main body case. A detection unit for detecting a stop is provided, and an energization control unit is provided, which includes a switch that is turned on and off by the operation of the detection unit, and a timer circuit that cuts off the power to the motor after a certain period of time has passed from the switching of the switch. A vacuum cleaner featuring: 2. Claim 1, characterized in that the detection section is formed by a wheel holder that moves in the front-rear direction.
Vacuum cleaner as described in section. 3. The vacuum cleaner according to claim 1, wherein the detection part is formed by a handle holder that moves in the front and back direction.