JPH0662990A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To prevent damages to an electric motor for rotating a driving wheel with a simple structure by a method wherein a semiconductor switch adapted to switch the electric motor between the regular and reverse rotation is controlled by a switching device operable by the push and pull manipulation of a sucker body. CONSTITUTION:The sucker body 1 is pushed forward to rock an operating lever 12 so as to turn on a switch 14. Electric current is then applied to a gate of TRIAC 21 through the switch 14 and a diode 23 to turn TRIAC on and an electric motor 8 is then rotated in the regular direction to rotate a rotary brush 16 counterclockwise, whereby a driving wheel is rotated in the regular direction to move the sucker body 1 forward. The sucker body 1 is pulled to turn on a switch 15, the rotary brush 16 is rotated clockwise and the sucker body 1 is moved rearward. The space between the switches 14 and 15 is made wider to lengthen the non-energized period of the electric motor 8 and the track resistance produced upon switching current to the electric motor 8 is made smaller to lower the load.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric vacuum cleaner, and more particularly to an improvement of an electric vacuum cleaner having a floor suction tool having a traveling mechanism.

[0002]

2. Description of the Related Art Conventionally, as a floor suction tool of this kind of vacuum cleaner, a drive wheel for traveling the suction tool body is provided, and the drive wheel is interlocked with the pushing / pulling operation of the suction tool body. In order to improve the push-pull operability of the suction tool body by rotating the suction tool body toward the front, there is known from JP-A-1-310630.

In this floor suction device, a switch device for switching the direction of rotation of an electric motor for rotating and driving a drive wheel in tandem with a push / pull operation moves an extension pipe connected to the suction device body back and forth. After that, the switch is held in the switched position until it is switched in the opposite direction.The switch is operated to prevent the motor from burning out and to perform stable operation regardless of the operation speed of the push-pull operation. A delay circuit is inserted between the device and the electric motor to switch the rotation direction of the electric motor after a predetermined time has elapsed from the switching operation of the switch device.

However, since the delay circuit is inserted between the switch device and the electric motor and is supplied with a high voltage, it has to be composed of pressure-resistant parts, which is disadvantageous in that it is expensive. Further, since a high voltage is supplied to the switch device, there is a drawback that the service life is shortened, for example, spark discharge is generated during the switching operation, the contacts are melted and the contacts are fused.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks, and it is possible to prevent damage to an electric motor for driving a drive wheel with a simple structure, and to improve reliability of switching of a rotating direction of the electric motor. An object of the present invention is to provide an electric vacuum cleaner having a floor suction tool that can be improved.

[0006]

A floor suction device according to a first means of the present invention is a suction device body having an intake port on a bottom surface, and a suction device body, at least a part of which is provided outside the suction device body. Drive wheels facing the, and an electric motor that rotationally drives the drive wheels,
A semiconductor switch that switches the rotation direction of the electric motor between forward and reverse,
And a switch device which is operated by push-pull operation of the suction tool body to control energization of the semiconductor switch.

According to a second aspect of the present invention, there is provided a floor suction tool, a suction tool body having an intake port on a bottom surface thereof, and a drive wheel which is disposed on the suction tool body and at least a part of which is exposed to the outside of the suction tool body. An electric motor that rotationally drives the drive wheels, a bidirectional semiconductor switch that switches the rotation direction of the electric motor between normal and reverse directions, and a switch device that is operated by a push-pull operation of the suction tool body to control the energization direction of the semiconductor switch. It is characterized by that.

The floor suction device of the third means of the present invention is a suction wheel body having an intake port on the bottom surface, and a drive wheel which is disposed on the suction wheel body and at least a part of which is exposed to the outside of the suction wheel body. An electric motor that rotationally drives the drive wheels, and a pair of unidirectional semiconductor switches that switch the rotation direction of the electric motor between forward and reverse,
And a switch device which is operated by push-pull operation of the suction tool body to control energization of each semiconductor switch.

According to a fourth aspect of the present invention, there is provided a floor suction tool, a suction tool body having an intake port on a bottom surface thereof, and a drive wheel which is disposed on the suction tool body and at least a part of which is exposed to the outside of the suction tool body. An electric motor that drives the drive wheels to rotate, a semiconductor switch that switches the direction of rotation of the electric motor between normal and reverse, a switch device that is operated by pushing and pulling the suction tool body, and the semiconductor switch is energized after a predetermined time has passed from the operation of the switch device. And a delay circuit for controlling.

[0010]

According to the first means of the present invention, when the push-pull operation is performed with the suction tool body placed on the surface to be cleaned, the switch device is operated by the push-pull operation to control the energization of the semiconductor switch. The electric motor rotates the drive wheel in the direction corresponding to the push / pull operation of the suction tool body. That is, when the suction tool body is pushed, the electric motor drives the drive wheels to rotate in the direction in which the suction tool body travels forward, and when the suction tool body is pulled, the electric motor drives the drive wheels and the suction tool body. It is driven to rotate backward.

When the operating direction of the suction tool body is changed, no current flows through the electric motor until the switch device is switched, and the inertia of the electric motor is reduced or eliminated during that time.
The starting resistance of the electric motor when the current in the opposite direction starts to flow is reduced, and the heat generation of the electric motor is reduced.

According to the second means of the present invention, when the push-pull operation is performed with the suction tool body placed on the surface to be cleaned, the switch device is operated by the push-pull operation, and the bidirectional semiconductor switch is energized. The direction is controlled so that the electric motor rotates in the forward and reverse directions, and the drive wheels are rotated in the direction corresponding to the push-pull operation of the suction tool body. That is, when the suction tool body is pushed, the electric motor drives the drive wheels to rotate in the direction in which the suction tool body travels forward, and when the suction tool body is pulled, the electric motor drives the drive wheels and the suction tool body. It is driven to rotate backward.

When the operating direction of the suction tool body is changed, no current flows through the electric motor until the switch device is switched, and the inertia of the electric motor is reduced or eliminated during that time.
The starting resistance of the electric motor when the current in the opposite direction starts to flow is reduced, and the heat generation of the electric motor is reduced.

According to the third means of the present invention, when the push-pull operation is performed with the suction tool body placed on the surface to be cleaned, the switch device is operated by the push-pull operation, and a pair of one-way semiconductor switches. Is controlled so that the electric motor rotates the drive wheel in the direction according to the push / pull operation of the suction tool body. That is, at the time of pushing operation of the suction tool body, one of the semiconductor switches is energized, and the electric motor drives the drive wheel to rotate in the direction of causing the suction tool body to travel forward. The semiconductor switch is energized, and the electric motor rotationally drives the drive wheels in the direction in which the suction tool body travels backward.

When the operating direction of the suction tool body is changed, no current flows through the electric motor until the switch device is switched, and the inertia of the electric motor is reduced or eliminated during that time.
The starting resistance of the electric motor when the current in the opposite direction starts to flow is reduced, and the heat generation of the electric motor is reduced.

According to the fourth means of the present invention, when the push-pull operation is performed with the suction tool body placed on the surface to be cleaned, the switch device is operated by the push-pull operation, and the delay circuit operates to operate the switch. A predetermined time after the device is operated, the semiconductor switch is energized, and the electric motor rotates the drive wheel in the direction corresponding to the push-pull operation of the suction tool body. That is, when the suction tool body is pushed, the electric motor drives the drive wheels to rotate in the direction in which the suction tool body travels forward, and when the suction tool body is pulled, the electric motor drives the drive wheels and the suction tool body. It is driven to rotate backward.

When the operating direction of the suction tool body is changed, no current flows through the electric motor until the switch device is switched, and the inertia of the electric motor is reduced or eliminated during that time.
The starting resistance of the electric motor when the current in the opposite direction starts to flow is reduced, and the heat generation of the electric motor is reduced.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail with reference to FIGS.

Reference numeral 1 denotes a suction body, which is detachably attached to the cleaner body 4 via the extension tube 2 and the bellows hose 3. Reference numeral 5 denotes a brush chamber formed in the front part (upper part in FIG. 2) of the suction tool body 1 having a suction port 6 on the lower surface,
A rotary brush 16, which will be described later, faces the suction port 6 and is rotatably supported. Reference numeral 7 denotes a connecting pipe which is supported at the rear central portion (lower central portion in FIG. 2) of the suction tool body 1 so as to be vertically swingable with respect to the suction tool body 1 and to which the extension tube 2 is detachably connected. It has become so. Reference numeral 8 denotes an electric motor housed in the rear left space (lower left space in FIG. 2) of the suction tool body 1 and is adapted to rotate and drive a rotary brush 16 described later via a belt 9.

Reference numeral 10 denotes a switch device housed in the rear right space (the lower right space in FIG. 2) of the suction tool body 1 and has a case 11 whose lower surface is opened. Reference numeral 12 denotes an operation lever pivotably supported by the case 11 and having a lower end extending from an opening on the lower surface of the case 11 to the lower side of the suction tool body 1, and a spring erected between the upper end and the upper surface of the case 11. The operation lever 12 is held in the neutral position by the biasing force of 13. Reference numeral 14 is a first switch arranged on the front side of the case 11, and 15 is a second switch arranged on the rear side of the case 11, which is the suction tool body with the suction tool body 1 placed on the surface to be cleaned. By pushing and pulling 1, the operating lever 12 is swung back and forth by the surface to be cleaned, and when the suction tool body 1 is pushed, the upper end of the operating lever 12 is swung forward and the first switch is moved. 14 is operated to drive the electric motor 8 to rotate the rotary brush 16 described later in the counterclockwise direction in FIG. 3, and by pulling the suction tool body 1, the upper end of the operation lever 12 swings backward. Operate the second switch 15,
The electric motor 8 is driven to rotate a rotary brush 16 described later in a clockwise direction in FIG.

The mounting distance between the first switch 14 and the second switch 15 is wide so that when the pushing / pulling operation of the suction tool body 1 is switched, the operating lever 12 pushes one switch to move the other switch. It takes a sufficient time for the pressing operation to be performed, and there is a time during which the electric motor 8 is de-energized even when the suction tool body 1 is quickly pushed and pulled. Therefore, for example, when the suction tool main body 1 is moved from the pushing operation to the pulling operation, the operation lever 12 moves to the first position.
The state in which the switch 14 is pressed is changed to the state in which the second switch 15 is pressed, and the first switch 14 also moves to the second position between both positions.
The switch 15 is also not pressed, that is, in the OFF state, and the driving of the electric motor 8 is stopped, so that the inertial force of the electric motor 8 is reduced or eliminated by the rotational resistance during that time. Therefore, compared to a configuration in which the rotation of the electric motor 8 is instantaneously switched from the forward rotation direction to the reverse rotation direction, the starting resistance in the reverse rotation direction when the operation lever 12 is switched is small, and the load on the electric motor 8 is significantly reduced. As a result, the heat generation of the electric motor 8 is significantly reduced.

16 is in the brush chamber 5 of the suction tool body 1,
A rotary brush disposed so as to face the suction port 6 has both ends rotatably supported by bearings 17 formed on the side wall of the brush chamber 5, and is rotationally driven by the electric motor 8. Reference numeral 18 is a drive wheel formed at both ends of the rotary brush 16, and has a diameter smaller than the rotation locus of the scraping piece of the rotary brush 16.

Reference numeral 19 is a front wheel rotatably supported in front of the suction tool body 1, and 20 is a rear wheel rotatably supported behind the suction tool body 1.

Next, the circuit will be described with reference to FIG.

Reference numeral 21 is a triac connected in series with the commercial power source 22 and the electric motor 8, and has a gate connected to the series circuit of the first switch 14 and the diode 23 and the series circuit of the second switch 15 and the diode 24 via the resistor 25. Are connected in parallel. 26
Is a false ignition prevention circuit connected in parallel to the TRIAC 21,
It is composed of a resistor 27 and a capacitor 28 so as to prevent erroneous ignition due to a load current.

Reference numeral 29 is a display circuit for displaying the rotating direction of the electric motor 8 which is connected in parallel to the electric motor 8.
30 First display section composed of erroneous lighting prevention Zener diode 31 and reverse withstanding diode 32, LED33, LED33 Second display section composed of erroneous lighting prevention Zener diode 34 and reverse withstanding diode 35, and current limiting resistor 36 It is configured.

Then, the suction tool main body 1 is placed on the surface to be cleaned to perform cleaning by pushing and pulling. When the suction tool main body 1 is pushed forward, as shown in FIG. The lower end of 12 swings backward due to the surface to be cleaned, and the upper end of the operating lever 12 swings forward to turn on the first switch 14.

When the first switch 14 is turned on, current is supplied to the gate of the triac 21 via the first switch 14 and the diode 23, the triac 21 is turned on, and the electric motor 8
To rotate the rotating brush 16 in the counterclockwise direction in FIG. 3, and the drive wheel 18 rotates to move the suction tool body 1 forward. Further, the LED 30 is turned on by the voltage supplied through the triac 21, and the user is informed that the suction tool body 1 is traveling forward.

When the suction tool body 1 is pulled backward, the operation lever 12
The lower end of the
The upper end of the oscillates forward to turn on the second switch 15.

When the second switch 15 is turned on, a current is supplied to the gate of the triac 21 via the second switch 15 and the diode 24, the triac 21 is turned on, and the electric motor 8
Is rotated in the reverse direction to rotate the rotating brush 16 clockwise in FIG. 3, and the suction wheel body 1 is caused to travel rearward by the rotation of the drive wheel 18. Moreover, the LED 33 is turned on by the voltage supplied via the triac 21, and the user is informed that the suction tool body 1 is traveling backward.

When the operating direction of the suction tool body 1 is changed, for example, when the pushing operation is changed to the pulling operation, the operation lever 12
Shifts from the state of pressing the first switch 14 to the state of pressing the second switch 15, and between the two positions, the first switch 14
Neither the second switch 15 is pressed, that is, the second switch 15 is turned off, and the driving of the electric motor 8 is stopped. First switch
Since the distance between 14 and the second switch 15 is wide, the non-energized state of the electric motor 8 becomes long, the inertial force of the electric motor 8 is reduced by the rotational resistance during that time, and the rotation of the electric motor changes from the forward rotation direction to the reverse rotation direction. When the current direction is switched, the starting resistance is reduced and the load on the electric motor 8 is reduced.

Further, when the suction tool body 1 is lifted and separated from the surface to be cleaned, no force is applied to the lower end portion of the operating lever 12, so that the operating lever is biased by the spring 13.
12 automatically returns to the neutral position, both the first switch 14 and the second switch 15 are turned off, the drive of the electric motor 8 is stopped, and the rotation of the rotary brush 16 is stopped.

Since the current flowing through the first switch 14 and the second switch 15 is only the gate current of the triac 21,
It becomes a minute current, so that the welding of the contacts of the first and second switches 14 and 15 can be prevented, and the early damage can be prevented.

The circuit of the second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

A first thyristor 37 has a gate to which the first switch 14, a diode 38 and a resistor 39 are connected in series. A second thyristor 40 has a gate to which the second switch 15, a diode 41 and a resistor 42 are connected in series.

In the second embodiment, when the suction tool body 1 is pushed forward, the operating lever 12 turns on the first switch 14, and when the first switch 14 is turned on, the first switch 14, the diode 38 and the resistor are turned on. Voltage is supplied to the gate of the first thyristor 37 via 39, the first thyristor 37 is turned on to rotate the electric motor 8 in the forward direction, rotate the rotating brush 16 counterclockwise in FIG. 3, and rotate the drive wheel 18. The suction tool main body 1 is caused to travel forward.

When the suction tool body 1 is pulled backward, the operation lever 12
Turns on the second switch 15, and the second switch 15 turns on.
When N, a voltage is supplied to the gate of the second thyristor 40 via the second switch 15, the diode 38 and the resistor 39, the second thyristor 40 is turned on to rotate the electric motor 8 in the reverse direction, and the rotary brush 16 is moved in FIG. The suction tool main body 1 is caused to travel rearward by rotating the drive wheels 16 in a clockwise direction.

When the operating direction of the suction tool body 1 is changed, for example, when the pushing operation is changed to the pulling operation, the operation lever 12
Shifts from the state of pressing the first switch 14 to the state of pressing the second switch 15, and between the two positions, the first switch 14
Neither the second switch 15 is pressed, that is, the second switch 15 is turned off, and the driving of the electric motor 8 is stopped. First switch
Since the distance between 14 and the second switch 15 is wide, the non-energized state of the electric motor 8 becomes long, the inertial force of the electric motor 8 is reduced by the rotational resistance during that time, and the rotation of the electric motor changes from the forward rotation direction to the reverse rotation direction. When the current direction is switched, the starting resistance is reduced and the load on the electric motor 8 is reduced.

Further, when the suction tool body 1 is lifted and separated from the surface to be cleaned, no force is applied to the lower end portion of the operating lever 12, so that the operating lever is biased by the spring 13.
12 automatically returns to the neutral position, both the first switch 14 and the second switch 15 are turned off, the drive of the electric motor 8 is stopped, and the rotation of the rotary brush 16 is stopped.

The circuit of the third embodiment of the present invention will be described with reference to FIG. 6. Reference numeral 50 is a triac serially connected to a commercial power source 51 and an electric motor 8, and its gate has a full-wave rectification circuit 52.
Constant voltage smoothing circuit 53, switch device 54, first delay circuit 55,
Second delay circuit 56, first drive control unit 57 and second drive control unit
58 is connected.

The constant voltage smoothing circuit 53 comprises a Zener diode 59 and a capacitor 60, and outputs a DC constant voltage. The movable contact 61 of the switch device 54 has a first contact 62 when the suction tool body 1 is pushed.
In addition, it switches to the second contact 63 during the pulling operation and maintains the neutral position in the normal state.
The space between 62 and 63 is wide.

The first delay circuit 55 is connected to the first contact 62 of the switch device 54, is composed of resistors 64 and 65, and a capacitor 66, and delays for a predetermined time determined by their time constants and outputs. ing. The second delay circuit
56 is connected to the second contact 63 of the switch device 54 and has a resistance of 6
It is composed of 7, 68 and a capacitor 69, and outputs with a delay of a predetermined time determined by their time constants.

The first drive controller 57 includes a transistor 7
0, LED71 for display, LED72, photo triac 73
And the diode 74, the display LED 71 is caused to emit light based on the output of the first delay circuit 55, the triac 50 is brought into conduction, and the electric motor 8 is normally rotated. The second drive controller 58 includes a transistor 75, a display LED 76, an LED 77, a phototriac 78, and a diode 79. The second drive control unit 58 causes the display LED 76 to emit light based on the output of the second delay circuit 56, and the triac 50.
And the electric motor 8 is rotated in the reverse direction.

When the suction tool body 1 is placed on the surface to be cleaned and the suction tool body 1 is pushed forward, the switch device 54
The movable contact 61 is switched to the first contact 62, and after a predetermined time, the display LED 71 is turned on by the output from the first delay circuit 55 to display the traveling direction of the suction tool body 1 to the user, and the triac 50 is turned on. Then, the electric motor 8 is normally rotated to rotate the rotary brush 16 in the counterclockwise direction in FIG. 3, and the suction wheel body 1 is caused to travel forward by the rotation of the drive wheel 18.

When the suction tool body 1 is pulled backward, the switch device
The movable contact 61 of the switch 54 is switched to the second contact 63, and after a predetermined time, the display LED 76 is turned on by the output from the second delay circuit 56 to display the traveling direction of the suction tool body 1 to the user, and the triac 50 is turned on. When turned on, the electric motor 8 is rotated in the reverse direction, the rotary brush 16 is rotated clockwise in FIG. 3, and the suction wheel body 1 is caused to travel rearward by the rotation of the drive wheel 18.

When the suction tool body 1 is lifted and moved away from the surface to be cleaned, the movable contact 61 of the switch device 54 automatically returns to the neutral position, the drive of the electric motor 8 is stopped, and the rotation of the rotary brush 16 is stopped. To do.

The current flowing through the switch device 54 becomes a minute current for controlling the photodiodes 73 and 78, and the welding of the movable contact 61 to the first and second contacts 62 and 63 can be prevented. It is possible to prevent damage.

Further, the first and second delay circuits 55 and 56 are provided,
Triac 50 after a predetermined time from switching of the switch device 54
Since it is turned on, for example, when the suction tool body 1 is changed from a pushing operation to a pulling operation, a sufficient time is generated until the electric motor 8 is switched from the forward rotation to the reverse rotation, and the inertial force of the electric motor 8 is reduced. Then, the starting resistance at the time of reverse rotation is reduced and the load on the electric motor 8 is significantly reduced, so that the heat generation of the electric motor 8 is reduced.

[0049]

As described above, according to the constitutions of the claims of the present invention, it is possible to prevent the damage of the electric motor or the like at a low cost with a simple constitution, and to provide the switch device for switching the rotation direction of the drive wheels. It has effects such as a longer life and improved reliability.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a first embodiment of the present invention.

FIG. 2 is a transverse sectional view of the suction tool body.

FIG. 3 is a vertical cross-sectional view of the suction tool body.

FIG. 4 is an external perspective view of the same electric vacuum cleaner.

FIG. 5 is a circuit diagram of a second embodiment of the present invention.

FIG. 6 is a circuit diagram of a third embodiment of the present invention.

[Explanation of symbols]

 1 Suction tool body 6 Intake port 8 Electric motor 10 Switch device 18 Drive wheel 21 Triac 37, 40 Thyristor 50 Triac 54 Switch device 55, 56 Delay circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshikazu Ota 2-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (4)

[Claims] 1. A cleaner main body having a built-in electric blower, a bellows hose connected to a suction port formed in the cleaner main body, an extension pipe connected to the bellows hose, and an extension pipe connected to the extension pipe. A floor suction device, the floor suction device having a suction port on a bottom surface, and a drive wheel disposed on the suction device body and at least a part of which is exposed to the outside of the suction device body. An electric motor that rotationally drives the drive wheel, a semiconductor switch that switches the rotation direction of the electric motor between normal and reverse directions, and a switch device that is operated by push-pull operation of the suction tool body and controls energization of the semiconductor switch. An electric vacuum cleaner characterized by that. 2. A cleaner body having a built-in electric blower, a bellows hose connected to a suction port formed in the cleaner body, an extension pipe connected to the bellows hose, and an extension pipe connected to the extension pipe. A floor suction device, the floor suction device having a suction port on a bottom surface, and a drive wheel disposed on the suction device body and at least a part of which is exposed to the outside of the suction device body. An electric motor that rotationally drives the drive wheels, a bidirectional semiconductor switch that switches the rotational direction of the electric motor between normal and reverse directions, and a switch device that is operated by pushing and pulling the suction tool body to control the energizing direction of the semiconductor switch. An electric vacuum cleaner comprising: 3. A cleaner body having a built-in electric blower, a bellows hose connected to a suction port formed in the cleaner body, an extension pipe connected to the bellows hose, and an extension pipe connected to the extension pipe. A floor suction device, the floor suction device having a suction port on a bottom surface, and a drive wheel disposed on the suction device body and at least a part of which is exposed to the outside of the suction device body. An electric motor that rotationally drives the drive wheels, a pair of unidirectional semiconductor switches that switch the rotation direction of the electric motor between normal and reverse directions, and control the energization of each of the semiconductor switches that is operated by pushing and pulling the suction tool body. An electric vacuum cleaner, comprising: 4. A cleaner body having a built-in electric blower, a bellows hose connected to a suction port formed in the cleaner body, an extension pipe connected to the bellows hose, and an extension pipe connected to the extension pipe. A floor suction device, the floor suction device having a suction port on a bottom surface, and a drive wheel disposed on the suction device body and at least a part of which is exposed to the outside of the suction device body. An electric motor that rotationally drives the drive wheels, a semiconductor switch that switches the rotation direction of the electric motor between normal and reverse directions, a switch device that is operated by push-pull operation of the suction tool body, and a predetermined time after the operation of the switch device. An electric vacuum cleaner comprising a delay circuit for controlling energization of a semiconductor switch.