JPH05253158A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To prevent a rotary brush and a floor nozzle main body from being damaged by deciding that a large piece of dust or solid and weighty dust is wound across the rotary brush with a control means by shielding light from the light emitting element of a foreign matter sensor to be received with a light receiving element, and stopping the rotation of the rotary brush transiently. CONSTITUTION:When a foreign matter intrudes into a suction room, the foreign matter is scraped up to the rear upper part of the suction room in the rotating direction of the rotary brush, thereby, the light received from a light emitting diode 11 by a phototransistor 12 is shielded. At this time, a voltage at a point (b) goes to the same voltage as that of a power source 15. When such state lasts for a prescribed time, the control means 13 judges that the foreign matter intrudes into the suction room, and decreases the rotating speed of a motor 1. When the foreign matter is removed from the suction room and a state where the voltage at the point (b) shows zero continues, the control means 13 judges that no foreign matter exists in the suction room, and rotates the motor 1 normally, and rotates the rotary brush again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a floor nozzle for an electric vacuum cleaner equipped with a rotating brush effective for cleaning carpets and the like.

[0002]

2. Description of the Related Art FIG. 3 is a schematic view of a floor nozzle of a conventional electric vacuum cleaner.

In FIG. 4, 1 is a drive means (hereinafter referred to as a motor), 2 is a shaft of the motor 1, 3 is a power transmission means (hereinafter referred to as a belt), which is a circumferential belt. .. 4 is a gear that receives power from the motor 1 through the belt 3, 5 is a suction chamber, 6 is a rotating brush installed in the suction chamber 5 to wind up dust on the floor by rotating 7 Is a rotary shaft of the rotary brush 5, and the gear 4 and the rotary brush 6 are connected through a rotary shaft 7. Reference numeral 8 is a blade of the rotary brush 6, which is made of flexible resin, 9 is a suction port, and 10 is a floor nozzle body.

The floor nozzle constructed as above will be described. When cleaning a carpet or the like, first, when the motor 1 is driven, the shaft 2 of the motor 1 rotates, and this rotation causes the gear 4 to rotate through the operation of the power transmission means (hereinafter referred to as a belt) 3. The rotating brush 6 installed in the gear 4 and the suction chamber 5 rotates at the same number of rotations with the rotating shaft 7 as the center of rotation when the gear 4 rotates. As the rotary brush 6 rotates, the blades 8 of the rotary brush 6 wind up the dust that has entered into the deep layer on the floor surface such as the carpet, and the dust is sucked into the suction port 9.

[0005]

However, in the above-mentioned conventional configuration, when the rotating brush 6 is rotating, if a large dust or a hard and heavy dust enters the suction chamber 5, the large dust or Hard and heavy dust is not sucked into the suction port 9 and the rotary brush 6 is rolled in. If the rotary brush 6 continues to rotate, the blade 8 of the rotary brush 6 and the floor nozzle body 10 may be damaged. It had the drawback that it would end up.

The present invention solves the above-mentioned problems of the prior art. When the rotary brush encloses large dust or hard and heavy dust, the rotation of the rotary brush is temporarily stopped or stopped. It is an object of the present invention to provide a floor nozzle for an electric vacuum cleaner that prevents the rotary brush and the floor nozzle main body from being damaged when dropped.

[0007]

In order to achieve this object, a floor nozzle of an electric vacuum cleaner according to the present invention comprises a rotary brush, a suction chamber containing a foreign matter sensor including a light emitting element and a light receiving element, and the rotary brush. Drive means for rotationally driving,
A configuration is provided that includes control means for controlling the drive means by a signal from the dust sensor and power transmission means for transmitting power from the drive means to the rotary brush.

[0008]

With this configuration, when the rotating brush entrains large dust or hard and heavy dust while the rotating brush is rotating, the light emitting element of the foreign matter sensor including the light emitting element and the light receiving element By blocking the light received by the light receiving element, the control means determines that the rotating brush is enclosing large dust or hard and heavy dust, and temporarily stops the rotation of the rotating brush installed in the suction chamber. However, it is possible to prevent damage to the rotating brush and the floor nozzle body.

[0009]

Embodiments will be described below with reference to the accompanying drawings. The same parts as those of the prior art are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 1, 1 is a motor which is a driving means, 2 is a shaft of the motor 1, 3 is a belt which is a power transmission means, 4 is a gear, 5 is a suction chamber, 6 Is a rotary brush, 7 is a rotary shaft of the rotary brush 6, 8 is a blade of the rotary brush 6, 9 is a suction port, and 10 is a floor nozzle body. Reference numeral 11 is a light emitting element composed of a light emitting diode which emits integrated light,
Reference numeral 12 is a light receiving element composed of a phototransistor which is turned on / off by receiving or not receiving light.
Reference numeral 13 is a control means for controlling the number of rotations of the motor 1 by a signal from the phototransistor 12. 1 in FIG.
Reference numeral 4 denotes a foreign matter sensor, 15 a power source for the light emitting diode 11 and the phototransistor 12, and 16 a resistor. In FIG. 3, 17 indicates a foreign substance.

The floor nozzle constructed as above will be described. When the motor 1 rotates, rotational power is transmitted to the gear 4 through the belt 3 and the rotary brush 6 rotates in the direction indicated by a in FIG. The light emitting diode 11 and the phototransistor 12 are installed so as to face each other from both sides of the rear upper part in the suction chamber 5, and the phototransistor 12 does not react to minute dust and reacts to a certain size or more. The sensitivity is adjusted so that The light emitting diode 11 constantly emits light, and when there is no foreign matter such as large and heavy dust in the suction chamber 5, the phototransistor 12 is always receiving light and the voltage at the point indicated by b in FIG. 2 is zero. And
The control means sees that the voltage at the point indicated by b is zero, and if the state where the voltage at the point indicated by b is zero continues for a certain period of time or more, it judges that there is no foreign matter in the suction chamber 5 and the motor 1 It outputs a signal to make normal rotation. Assuming that the foreign matter enters the suction chamber 5 as shown in 17 of FIG. 3, the foreign matter is scraped up to the upper rear portion of the suction chamber 5 by the rotating direction of the rotary brush 6, and the light emitting diode 11 causes the phototransistor 1 to move.
The light received by 2 is blocked. At this time, the voltage at the point indicated by b becomes the same voltage as that of the power supply 15, and if this state continues for a certain time or longer, the control means 13 determines that the foreign matter has entered the suction chamber 5, and the foreign matter easily enters the suction port 9. When the light received by the phototransistor 12 from the light emitting diode 11 is intermittently cut off without being absorbed, a pulsed voltage appears at the point b, but the control means 13 counts the number of pulses, and a certain number or more of pulses are detected. When it appears, it is determined that foreign matter has entered the suction chamber 5, and the rotation speed of the motor 1 is reduced. If foreign matter is removed from the suction chamber 5 and the voltage at the point indicated by b continues to be zero for a certain time or longer, the control means 13 determines that there is no foreign matter in the suction chamber 5 and causes the motor 1 to rotate normally. A signal is output so that the rotary brush 6 rotates normally again.

As described above, according to this embodiment, a light emitting diode that constantly emits integrated light and a phototransistor whose sensitivity is adjusted so as not to react to minute dust but to a certain size or more are provided. It is installed facing each other from both sides of the rear upper part in the suction chamber, and by providing a control means for controlling the number of rotations of the motor by judging the presence of foreign matter in the suction chamber by the output of the phototransistor, When foreign matter such as heavy dust enters, the rotation speed of the rotary brush can be reduced to prevent damage to the rotary brush and the floor nozzle body.

Although the control means 13 is supposed to reduce the number of rotations of the motor 1, it also includes stopping.

[0014]

As described above, according to the present invention, a suction chamber having a foreign substance sensor composed of a rotating brush, a light emitting element and a light receiving element, a driving means for rotating the rotating brush,
By providing a control means for controlling the drive means with a signal from the dust sensor and a power transmission means for transmitting power from the drive means to the rotary brush, foreign matter such as large and heavy dust in the suction chamber. It is possible to realize an excellent floor nozzle for an electric vacuum cleaner that can prevent the rotary brush and the floor nozzle main body from being damaged by lowering or stopping the rotation speed of the rotary brush when an intrusion occurs.

[Brief description of drawings]

FIG. 1 is a perspective view of a floor nozzle of an electric vacuum cleaner according to the present invention and a diagram showing its operation.

FIG. 2 is a diagram showing an operation of a foreign matter sensor of a floor nozzle of the electric vacuum cleaner according to the present invention.

FIG. 3 is a sectional view of the floor nozzle of the electric vacuum cleaner of the present invention seen from the front.

FIG. 4 is a schematic configuration diagram of a floor nozzle of a conventional electric vacuum cleaner.

[Explanation of symbols]

 1 Motor 2 Shaft 3 Belt 4 Gear 5 Suction Chamber 6 Rotating Brush 7 Rotating Shaft 8 Blade 9 Suction Port 10 Floor Nozzle Main Body 11 Light Emitting Diode 12 Phototransistor 13 Control Means 14 Foreign Object Sensor 15 Power Supply 16 Resistance

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Murata 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Yoshitaka Murata 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A suction chamber containing a foreign matter sensor consisting of a rotating brush, a light emitting element and a light receiving element, a driving means for rotating the rotating brush, and a control means for controlling the driving means by a signal from the dust sensor. And a floor nozzle of an electric vacuum cleaner, which has power transmission means for transmitting power from the driving means to the rotary brush.