JP3183413B2 - Electric vacuum cleaner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner having improved operability when a suction port body is pushed or pulled.

[0002]

2. Description of the Related Art In a conventional vacuum cleaner, suction is performed by a negative pressure of an electric blower having a constant output set by an operation switch or the like, that is, suction power, or a motor for rotating a traveling wheel has a constant speed. It rotates with and assists running.

[0003]

In the above structure, when the suction port main body is advanced, the operator pushes the hose, so that a downward force acts on the suction port main body, so that the suction port main body needs a force to travel. Have.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a vacuum cleaner in which the operability is improved when the suction port body is pushed or pulled without lowering the cleaning ability. Aim.

[0005]

According to a first aspect of the present invention, there is provided an electric vacuum cleaner, comprising: an electric blower, a suction port body for sucking dust by a negative pressure generated by the electric blower, and a contact surface to be cleaned.
Rotate in the direction according to the forward and backward movement of the suction port body
Rotating body, which performs a pressing operation in accordance with the rotating direction of the rotating body.
Switch according to the pressing body and the pressing operation of the pressing body.
That includes the change-over switch, the traveling direction detecting means for detecting the forward and reverse <br/> of the suction inlet main body, said electric compared with the case where the advanced this traveling direction detecting means retracting the suction port body to be detected Electric blower control means for reducing the output of the blower.

According to a second aspect of the present invention, there is provided an electric vacuum cleaner, an electric blower, a suction main body for sucking dust by a negative pressure generated by the electric blower, and a lower part from a lower surface of the suction main body.
A rotating body that protrudes and assists the traveling of the suction port body in the traveling direction, an electric motor that rotationally drives the rotating body, traveling direction detecting means for detecting advance and retreat of the suction port body, and forward traveling by the traveling direction detecting means. Motor control means for increasing the output of the motor when the suction port body is retracted, as compared with the case where the suction port body is retracted.

[0007]

According to the first aspect, the vacuum cleaner contacts the surface to be cleaned.
Rotates in the direction according to the forward and backward movement of the suction body
The changeover switch is turned off by the pressing body according to the rotating direction of the rotating body.
When the forward direction is reliably detected by the traveling direction detecting means for detecting the forward and backward movement of the suction port main body , the electric blower control means reduces the output of the electric blower as compared with the case where the suction main body is retracted. Even if the operator pushes the suction port body downward and advances the suction port body, the output of the electric blower is surely reduced , the negative pressure is weakened, and the suction force of the suction port body to the floor surface is weakened. Operability is improved.

According to the second aspect of the present invention, when the forward direction is detected by the traveling direction detecting means, the motor control means increases the output of the motor as compared with the case where the suction port body is retracted. Even if the suction port body is advanced by pressing the suction port body downward, the output of the electric motor increases to protrude downward from the lower surface of the suction port body to assist in traveling. Therefore, operability is surely improved.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

First, the entire vacuum cleaner will be described with reference to FIG.

In FIG. 2, reference numeral 1 denotes a vacuum cleaner main body, which has a built-in electric blower 2 and a base end of a hose 3 is detachably connected to the vacuum cleaner main body 1; A handle 4 having a shape branched toward the rear is provided at the tip of 3. A suction port main body 7 having a built-in electric motor 6 is attached to an end of the handle portion 4 via a telescopic extension tube 5.

[0013] Then, as shown in FIG.
On the upper surface, a fitting hole 11 for connecting the extension pipe 5, an electric blower speed difference setting switch 12 for setting a speed difference between a forward speed and a backward speed of the electric motor 6 of the suction port main body 7, and an electric blower Power control switch to change output of 2
13 are provided.

Further, as shown in FIG. 4, the suction port main body 7 is a suction chamber having a horizontally long front side and an opening formed on the bottom side.
An air passage chamber 16 communicates with the suction chamber 15 on the rear side and a motor chamber 17 located on one side of the air passage chamber 16.
Are sectioned.

Further, a communication pipe 18 is vertically rotatably supported at the center of the rear portion of the suction port main body 7, and the front end of the communication pipe 18 is rotatably fitted inside the air passage chamber 16. At the same time, the interior communicates with the suction chamber 15 via the air passage chamber 16.

A driven follower wheel 19 is rotatably supported on both sides of a rear portion of the suction port main body 7.

Further, a cleaning blade 21 is rotatably supported in the suction chamber 15 of the suction port main body 7, and is provided to protrude downward from the suction port so as to come into contact with a surface to be cleaned. In addition, a traveling wheel 22 as a rotating body is rotatably supported by a rotating shaft 23 on the suction port main body 7 on the both sides of the air path chamber 16 in front of the electric motor chamber 17 at a rear portion of the cleaning blade 21, The running wheel 22 projects below the lower surface of the suction port main body 7 and rotates in contact with the surface to be cleaned.

The electric motor room 17 is provided with an electric motor 6 for driving the cleaning blade 21 and the running wheels 22. A belt 24 for power transmission is connected to a pulley 25 fixed to an output shaft of the electric motor 6, a lower side of a tension roller 26, and a running wheel.
It passes over the pulley 25 of the output shaft of the electric motor 6 via the upper side of the pulley 27 fixed to the rotating shaft 23 of the motor 22 and the lower side of the pulley 28 fixed to the end of the cleaning blade 21. Then, the cleaning blade 21 and the traveling wheel 22 are rotated by the belt 24 in directions opposite to each other.

Further, a substantially rectangular parallelepiped traveling direction detecting means storage chamber 31 is defined and formed on the other side of the motor chamber 17 of the suction port main body 7. As shown in FIG. 5, the detection means storage chamber 31 has a lower surface opened to face the surface to be cleaned, and one side surface opened at an opening portion 32 to communicate with the suction chamber 15. Are surrounded by the partition wall 33. The detection direction storage means 31 for detecting the direction of movement of the suction port main body 7 is stored in the detection means storage chamber 31.

The traveling direction detecting means 34 is provided in the suction port main body 7.
A rotating shaft 35 is rotatably supported along the longitudinal direction of the shaft, and a columnar rotating body 36 is provided coaxially with the rotating shaft 35. Also,
A projection 37 facing the surface to be cleaned is provided to protrude in the radial direction of the rotating body 36. Further, a pressing body 38 is attached to one end of the rotating shaft 35, and the pressing body 38 operates an operating body 42 of a changeover switch 41 that detects a traveling direction in accordance with the rotation of the rotating body 36.

Next, the circuit configuration of the above embodiment is shown in FIG.
This will be described with reference to FIG.

In FIG. 1, E is a commercial AC power supply, and this commercial AC power supply E is connected to the electric blower 2 via a fuse F and an electric blower control circuit 51 as electric blower control means for controlling the output of the electric blower 2. Have been. Also,
To the electric blower 2, noise-prevention capacitors C1, C2, and C3, which are Δ-connected between both ends of a commercial AC power supply E for noise prevention, are connected.

The electric blower control circuit 51 triggers a power supply synchronous rectifier circuit 52 for stepping down the current of the commercial AC power supply E and resetting the charging of the charging circuit, a charging circuit 53, and a charging voltage according to the charging voltage of the charging circuit 53. And a power control circuit 55 connected between the commercial AC power supply E and the electric blower 2 for varying the output of the electric blower 2.

The power supply synchronous rectifier circuit 52 includes a fuse F
Transformer Tr1 at both ends of the commercial AC power supply E via
Primary winding Tr1a is connected, and the secondary winding of this transformer Tr1
A rectifying diode bridge 56 including diodes D1, D2, D3, and D4 is connected to Tr1b. A resistor R1 and a zener diode ZD1 are connected from the positive side to the negative side of the diode bridge 56.

Further, the Zener diode ZD1 has
A series circuit of a resistor R2, an operation circuit 57 and a capacitor C4 for charging and a series circuit of a resistor R3 and a resistor R4 connected in series are connected in parallel.

The anode of the programmable unijunction transistor PUT1 as a trigger element is connected to the capacitor C4, and the gate is connected to the connection point between the resistors R3 and R4. The cathode of the programmable unijunction transistor PUT1 is connected to the diode bridge 56 through the primary winding Tr2a of the insulating transformer Tr2.
Is connected to the negative side. Also, the secondary winding of the transformer Tr2
One end of Tr2b is connected to the gate of Triac Tri via a stabilization circuit for preventing false firing consisting of a resistor R5 and a diode D5, and the other end of the secondary winding Tr2b is connected to Triac Tri.
Is connected to the other end. Also, Triac Tri
It has a snubber circuit consisting of a resistor R6 and a capacitor C5.

Further, the operation circuit 57 is connected to a trigger voltage setting terminal 60 connected to the capacitor C4, via an electric blower speed difference setting circuit 58 for setting a difference depending on the direction of movement of the suction port main body 7, and via a power control switch 13. Are connected in parallel, and a first conductor 62 and a second conductor 63 are connected to the sliding resistors R7 and R8. Further, a first conductor 62 and a second conductor 63 are connected to the circuit ground side terminal 61 connected to the resistor R2.
A shorter third conductor 64 is connected. A first slider 65 is provided between the sliding resistor R8 and the first conductor 62, and electrically connects the sliding resistor R8 and the first conductor 62 to each other.
A second slider 66 is provided between the second conductor 63 and the third conductor 64, and has a portion to be opened for turning off.
And the third conductor 64 are electrically connected. Furthermore, the first
The slider 65 and the second slider 66 are linked and driven by the power control switch 13.

The electric blower speed difference setting circuit 58 is set to be open, a resistor R12 or a short circuit by the electric blower speed difference setting switch 12. Further, a traveling direction detecting means 67 is connected to the electric blower speed difference setting circuit 58.
It is composed of 0 parallel circuits.

Next, the operation of the above embodiment will be described.

First, when the power control switch 13 of the handle portion 4 is slid, the power control switch
13, the first slider 65 and the second slider 66 follow, and the sliding resistance R8 and the first conductor 62, the second conductor 63 and the third conductor 64
Are electrically connected. As a result, a closed circuit is formed between the resistor R2 and the capacitor C4 through the operation circuit 57, and the charging voltage of the capacitor C4 applied to the anode of the programmable unijunction transistor PUT1 is applied to the gate of the programmable unijunction transistor PUT1. Therefore, the programmable unijunction transistor PUT1 is turned on and the electric blower 2 is driven.

The voltage of the commercial AC power supply E is
Stepped down by Tr1, rectified by diode bridge 56,
Make the voltage constant with R1 and Zener diode ZD1. Then, the capacitor C4 of the charging circuit 53 is charged, and this capacitor C4
When the charging voltage becomes higher than the set voltage set by the operation circuit 57, the programmable unijunction transistor PUT1 is turned on. The capacitor C4 discharges in synchronization with the voltage of the power supply synchronous rectifier circuit 52.

When the programmable unijunction transistor PUT1 is turned on, the transformer Tr2 triggers on the gate of the triac Tri of the power control circuit 55 to turn on the triac Tri, and controls the phase of the power according to the phase angle at which it turns on. And controls the output of the electric blower 2.

When controlling the output of the electric blower 2, the power control switch 13 of the handle 4 is
The resistance value of the sliding resistor R8 is varied according to the medium and low levels.

For example, an electric blower 2 such as a curtain
If the output of the power control switch 13 is small, the power control switch 13 is slid to set it to a low value, and the resistance value of the sliding resistor R8 is increased. As a result, the combined resistance value of the operation circuit 57 increases, the voltage of the gate of the programmable unijunction transistor PUT1 increases, and the charging time to the set voltage of the capacitor C4 increases.
The time during which the unijunction transistor PUT1 is turned on is delayed, thereby increasing the phase control angle of the triac Tri, so that the output of the electric blower 2 is reduced.

On the other hand, like the carpet, the electric blower 2
When a large output is required, the power control switch 13 is slid and set to a high value, and the resistance value of the sliding resistor R8 is reduced. As a result, the phase control angle of the triac Tri becomes smaller, so that the output of the electric blower 2 becomes larger.

When the power control switch 13 is slid and set to off to open the second conductor 63 and the third conductor 64, the gate voltage of the power control switch 13 becomes much higher than the charging voltage of the capacitor C4. Therefore, the programmable unijunction transistor PUT1 is not turned on and the electric blower 2 is not driven.

When the hose 3 is detached from the vacuum cleaner body 1, the circuit ground side terminal 61, the trigger voltage setting terminal
Similarly, when at least one of 60 is opened, the electric blower 2 is not driven.

The electric blower speed difference setting switch 12
Is set to "a" shown in FIG. 1, the advancing direction detecting means 34 is short-circuited in any case.
Regardless of whether or not is moved forward, the input amount input to the electric blower 2 is set to the same input amount as shown in FIG. 6B.

On the other hand, when the setting of the electric blower speed difference setting switch 12 is set to b or c shown in FIG. 1, the changeover switch 41 is used for moving the suction port main body 7 forward.
Is turned off to set the resistance value via the resistor R10, and in the case of retreat, the changeover switch 41 is turned on to short-circuit the resistor R10. That is, as shown in FIGS. 6C and 6D, the suction port main body 7 is pushed forward and moved forward as compared with the case where the suction port main body 7 is pulled and retracted during cleaning and the changeover switch 41 is turned on. Is smaller, the input to the electric blower 2 is reduced. The changeover switch 41 causes the pressing body 38 to switch the operating body 42 by rotating the rotating body 36.
When set to c, the resistor R10 is used alone, and when set to b, the resistance value is higher than the combined resistance value of the resistors R9 and R10 connected in parallel. The difference increases.

The electric fan speed difference setting switch 12
It is possible to set the output difference of the electric blower 2 when the suction port main body 7 advances and retreats according to a desired difference, to increase the input difference in a heavily operated carpet, and to reduce the input difference between lightly operated boards. do it.

As described above, the input of the electric blower 2 when the suction port main body 7 is pressed is made smaller than the input when the suction port main body 7 is pulled. Since the suction port main body 7 is pressed against the floor surface, even if the negative pressure is reduced, the suction force between the suction port main body 7 and the floor surface is reduced without lowering the cleaning ability, and the operability is improved. In addition, when the suction port body 7 is pulled, the suction force of the suction port body 7 is increased to improve the cleaning ability and the operability.

Another embodiment will be described with reference to FIG.

The embodiment shown in FIG. 7 is obtained by removing the electric blower speed difference setting circuit 58 from the embodiment shown in FIG.

As described above, the electric blower speed difference setting circuit 58
, The input of the electric blower 2 can be made different according to the movement of the suction port main body 7.

Further, another embodiment will be described with reference to FIG.

The embodiment shown in FIG. 9 differs from the embodiment shown in FIG. 1 in that the electric motor 6 is replaced by the electric motor 6, the electric motor control circuit 51 is replaced by the electric motor control circuit 71 as electric motor control means, and , The traveling direction detecting means 34 is connected to the operation circuit 57. The motor control circuit
71 has the same configuration as the electric blower control circuit 51.

In this case, when the suction port body 7 is advanced, the changeover switch 41 is turned on and the resistor R10 is short-circuited to set the resistance value. In the case of retreat, the changeover switch 41 is turned off and the resistance R10 is set. Let through. That is, as shown in FIG. 10 (b), when the suction port body 7 is pushed forward and the changeover switch 41 is turned on, as compared with the case where the suction port body 7 is pulled and retracted during cleaning and the changeover switch 41 is turned off. Input to the motor 6 is increased.

As described above, the operability is improved by increasing the input of the electric motor 6 when the suction port main body 7 is pressed, compared with the input when the suction port main body 7 is pulled. When the operator presses the suction port body 7 against the floor surface, the suction port body 7 is prevented from floating, and the operability is maintained without reducing the cleaning ability even when the speed of the traveling wheels 22 is increased. Conversely, when the suction port body 7 is pulled, the speed of the traveling wheel 22 is reduced, and even if the suction port body 7 is lifted, the cleaning time per unit area is increased, so that the cleaning performance is not reduced. Since the tensile force of the main body 7 is originally weak, power saving can be achieved.

The rotating body is not limited to the traveling wheel 22 , but may be a cleaning means such as a rotating brush or a cleaning blade having a function of assisting traveling.

[0049]

According to the first aspect of the present invention, a vacuum cleaner is provided.
With the rotation of the rotating body that contacts the cleaning surface,
Forward direction is ensured by the traveling direction detecting means equipped with an operating pressing body
Once detected, the electric blower control means for reducing the output of the electric blower compared to the case to retract the suction port body, the operator to advance the suction port main body so as to press the suction port body downward In addition, the output of the electric blower is reliably reduced , the negative pressure is weakened, and the suction force of the suction port body on the floor is reduced, so that the operability can be reliably improved.

According to the second aspect of the present invention, when the forward direction is detected by the traveling direction detecting means, the motor control means increases the output of the motor as compared with the case where the suction port body is retracted. Even if the user pushes the suction port body downward and moves the suction port body forward, it will run downward from the bottom surface of the suction port body due to the increase in the output of the motor.
Since the running assisting force of the assisting rotating body is increased, the operability can be surely improved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing one embodiment of a vacuum cleaner according to the present invention.

FIG. 2 is a perspective view showing an external appearance of the electric vacuum cleaner.

FIG. 3 is a plan view showing a handle unit according to the embodiment.

FIG. 4 is an explanatory view showing the suction port main body.

FIG. 5 is an explanatory diagram showing a traveling direction detecting means according to the embodiment.

FIG. 6 is a waveform chart showing the same operation. (A) Waveform diagram showing the forward and backward directions of the suction port main body. (B) Waveform diagram showing the electric blower input amount when the changeover switch is set to a. (C) The electric blower input amount when the changeover switch is set to b. (D) Waveform diagram showing the input amount of the electric blower when the changeover switch is set to c

FIG. 7 is a circuit diagram showing another embodiment.

FIG. 8 is a waveform chart showing the same operation. (A) Waveform diagram showing forward and backward directions of the suction port main body (b) Waveform diagram showing electric blower input amount

FIG. 9 is a circuit diagram showing another embodiment.

FIG. 10 is a waveform chart showing the same operation. (A) Waveform diagram showing the forward and backward directions of the suction port body (b) Waveform diagram showing the motor input amount

[Explanation of symbols]

2 electric blower 6 motor 7 suction port main body 22 the rotary body as the travel wheels 34 the traveling direction detecting means 36 rotating body 37 projection 38 as an electric blower control circuit 71 motor control means as a pressing member 41 switch 51 electric blower control means Motor control circuit

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-4-176423 (JP, A) JP-A-5-123276 (JP, A) JP-A-1-310629 (JP, A) JP-A-3- 275024 (JP, A) JP-A-5-7541 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) A47L 9/28

Claims (2)

(57) [Claims] 1. An electric blower, a suction main body for sucking dust by a negative pressure generated by the electric blower, and an advancing and retreating of the suction main body in contact with a surface to be cleaned.
Rotating body that rotates in the direction
The pressing body that performs the pressing operation and the pressing operation of the pressing body
Therefore, a changeover switch is provided for switching , and
Traveling direction detecting means for detecting forward and backward movement, and electric blower control means for lowering the output of the electric blower when the forward direction is detected by the traveling direction detecting means as compared with a case where the suction port body is moved backward. An electric vacuum cleaner characterized by the above. 2. An electric blower, a suction main body for sucking dust by a negative pressure generated by the electric blower, and a rotating body projecting downward from a lower surface of the suction main body to assist the traveling of the suction main body in a traveling direction. An electric motor that rotationally drives the rotating body; a traveling direction detecting unit that detects forward and backward movement of the suction port main body; An electric vacuum cleaner comprising: electric motor control means for increasing the output of the electric motor.