JP2795381B2 - Vacuum cleaner suction body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Object of the invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suction port of a vacuum cleaner having a traveling mechanism capable of moving forward and backward.

[0003]

2. Description of the Related Art Conventionally, as described in, for example, Japanese Patent Application Laid-Open No. 63-197427, a rotating brush driven by an electric motor is rotated forward or backward in accordance with the traveling direction of a suction port main body. Thus, there is known an inlet body of a vacuum cleaner which assists the traveling of the inlet body.

In the suction port body of the vacuum cleaner, as a detecting means for detecting a front-back operation force applied from the outside to the suction port body by a user, a lower surface of the suction port body is provided with a surface to be cleaned. A structure is employed in which a lever that swings due to frictional resistance is supported, and this lever is linked to an actuator of a changeover switch that switches the polarity of the electric motor.

When the user pushes the suction port main body forward, the lever swings backward with respect to the suction port main body, and the rotary brush rotates in the forward direction by the forward rotation of the electric motor. When the suction port main body is pulled backward, the lever swings forward, and the rotating brush rotates in the retreating direction due to the reverse rotation of the electric motor. That is, the rotating direction of the rotating brush is reversed according to the operating force applied to the suction port main body by the user.

[0006]

However, in the conventional traveling apparatus described above, the rotational speed is constant, and the traveling speed is constant irrespective of the strength of the operating force. Fast, on the contrary slow,
There is a problem that current is interrupted due to binary control of running and stopping, and pulse noise often occurs.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a suction port of an electric vacuum cleaner in which electric power supplied to an electric motor is continuously changed.

[Configuration of the Invention]

[0009]

According to a first aspect of the present invention, there is provided a vacuum cleaner having a suction body having a suction chamber with an open lower surface, and a traveling body provided in the suction body so as to be rotatable forward and reverse. Means, a driving means having an electric motor for driving the traveling means to rotate forward and reverse at a variable speed, the driving means and the traveling means
Clutch means provided so that transmission between the row means can be brought into and out of contact
And when the electric motor of the driving means is stopped,
And the transmission of the traveling means is separated by the clutch means.
Switching control means, detecting means for detecting an operation force in the front-rear direction applied to the suction port body from the outside in the front-rear direction, and a pressure-sensitive element for performing an output that changes in accordance with the operation force, and receiving a signal from the detection means. When a forward operation force is applied to the suction port body, a signal for rotating the traveling means in the forward direction is applied.When a rearward operation force is applied to the suction port body, a signal for rotating the traveling means in the backward direction is applied to the operation force. Ri sent to the drive means at the output according to the operation of the pressure sensing element to detect
If the force is less than the predetermined value is obtained; and a main control unit that Ru stopping the motor. According to a second aspect of the present invention, there is provided a suction port body for a vacuum cleaner, comprising: a suction port main body having a suction chamber with an open lower surface; in a drive means having a forward and reverse rotation drive to the motor, the drive means and the run
Clutch means provided so that transmission between the row means can be brought into and out of contact
And when the electric motor of the driving means is stopped,
And the transmission of the traveling means is separated by the clutch means.
Switching control means for detecting the operating force applied to the suction port main body from the outside in the front-rear direction by being urged to a neutral position, and detecting means having a high impedance value at the neutral position of the detecting means. And an impedance means for decreasing the impedance value in accordance with an increase in the amount of rotation of the motor and supplying a current to the electric motor.

[0010]

According to the first aspect of the present invention, when the user attempts to run the suction port body on the surface to be cleaned while the traveling means is grounded during cleaning, the suction port body is pressure-sensitive. A detecting means comprising an element detects an operation force and strength in the front-rear direction applied from the outside to the suction port main body by a user, and the main control means sends a signal to the driving means in response to a signal from the detecting means, Transmits the output of the driving means to the traveling means
Then, the rotation direction and speed of the traveling means by the driving means are controlled. That is, when a forward operating force is applied to the suction port main body, the running means is rotated in the forward direction by the electric motor of the driving means, and further, the suction main body advances due to the rotation of the running means at a speed according to the operating force. . On the other hand, when a backward operation force is applied to the suction port main body, the traveling means is rotated in the reverse direction by the electric motor, and similarly, the suction port main body moves backward at a speed according to the operation force. Therefore,
The operating force applied to the suction port main body is detected by the detecting means including the pressure-sensitive element, and the motor is continuously operated according to the operating force of the user, and the traveling means operates at a predetermined speed. When the motor is stopped, it is driven by the switching control means.
Transmission of means and running means is separated by clutch means
Not only do not drive the running means, but also when the motor is stopped.
Do not drag the running means on the floor.

According to a second aspect of the present invention, when the user attempts to run the suction port main body on the surface to be cleaned while the traveling means is grounded during cleaning, the detecting means is provided. Is rotated, the front-rear operation force applied to the suction port body by the user from the outside is detected, and the impedance value is reduced in accordance with the increase in the amount of rotation, and the clutch means is driven by the drive means.
The force is transmitted to the traveling means to drive the electric motor of the driving means,
The rotation direction and speed of the traveling means by the electric motor are controlled. That is, when a forward operating force is applied to the suction port main body, the traveling means is rotated in the forward direction by the electric motor of the driving means. On the other hand, when a backward operation force is applied to the suction port main body, the traveling means is rotated in the reverse direction by the electric motor, and the suction port main body is similarly moved backward. Further, at the neutral position of the detecting means, the impedance is high, so that the power supplied to the motor decreases. When the motor is inverted, the power always passes through the neutral position. To prevent flow. In addition,
When the motive is stopped, the driving means and the running
The transmission of the running means is separated by the clutch means,
Not only drive but also run on the floor when the motor is stopped
Do not drag the means.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a suction port of a vacuum cleaner according to an embodiment of the present invention.

2 and 4, reference numeral 11 denotes a horizontally long suction main body, which is composed of a lower main body case 12 and an upper main body case fixedly connected to the lower main body case 12.
It consists of thirteen. In the suction port main body 11, a horizontally long suction chamber 16 is defined at the front side, and a wheel drive mechanism chamber 17, an air path chamber 18, and a brush drive mechanism chamber 19 are formed.
Are formed side by side on the rear side. The suction chamber 16 has an opening at the lower surface, and this opening serves as a suction port 20.

At the center of the rear of the suction port main body 11,
A first communication pipe 21 is supported by a rotation shaft 22 so as to be rotatable vertically by a predetermined angle. The first communication pipe 21 has a front end rotatably fitted in the air passage chamber 18 and a rear part protruding rearward and outward from the suction port main body 11. , And the inside thereof communicates with the suction chamber 16. Further, as shown in FIG.
In the communication pipe 21, a rotating shaft 22 formed to protrude outward from both left and right side surfaces of the front end is rotatably supported by bearings 23, respectively, and these bearings 23 are provided inside the lower body case 12. Are sandwiched and held by a support wall 24 formed in the upper body case 13 and a support wall (not shown) formed in the upper body case 13.

Further, the front end of the bent second communication pipe 25 is coaxially and rotatably fitted to the rear end of the first communication pipe 21. The second communication pipe 25 is detachably connected to a hose connected to a cleaner body (not shown) via an extension pipe. Then, the suction chamber 16
Is connected to a dust collection chamber in the cleaner body via both communication pipes 21, 25, an extension pipe, and a hose.

As shown in FIG. 3, at least one of the bearings 23 of the first communication pipe 21 has a pentagonal shape in which a lower portion is pointed downward, and front and rear sides of a lower surface are respectively front and rear. And inclined surfaces 23a and 23b inclined backward. Then, sheet-shaped pressure-sensitive variable resistance elements 26 and 27 as pressure-sensitive elements are attached to these inclined surfaces 23a and 23b, respectively. On the other hand, the bearing wall 23
Inclined surfaces 24a, 24 opposing inclined surfaces 23a, 23b, respectively.
The pressure-sensitive variable resistance elements 26 and 27 are respectively in contact with the inclined surfaces 24a and 24b. These pressure-sensitive variable resistance elements 26 and 27 change their electrical resistance values when subjected to pressure.

A rotary brush 31 is rotatably supported by a bearing 32 in the suction chamber 16 of the suction port main body 11. On the other hand, in the brush drive mechanism chamber 19, there is provided a rotating brush electric motor 33 for rotatingly driving the rotating brush 31, and a pulley fixed to an output shaft 34 of the electric motor 33 and the rotating brush 31 are provided. A belt 35 for power transmission is stretched over a pulley fixed to the end.

Further, on the lower side near the rear center of the suction port main body 11, rear wheels 41 and 42 as running means positioned on both left and right sides of the communication pipes 21 and 25 are provided with the left and right directions as the rotation axis direction. It is supported so that it can rotate forward and backward. These rear wheels 41, 42
Are coaxially fixed to an axle 43 pivotally supported by the suction port main body 11 and passing below the communication pipes 21 and 25, respectively.
In the wheel drive mechanism chamber 17 of the suction port main body 11, a wheel electric motor 44 for driving the rear wheels 41 and 42 in the forward and reverse directions is provided.
, A gear box 45, a transmission shaft 46, and clutch means.
And all the electromagnetic clutch mechanisms 47 are provided. The output shaft 48 of the motor 44 for the wheel through the reduction gear train in the gear box 45 is mechanically connected to the transmission shaft 46, the axle 43 this transmission shaft 46 via an electromagnetic clutch mechanism 47 Is connected to and detachable from.

On the left and right sides of the front edge of the lower surface of the suction port body 11, front wheels 51 and 52 are supported so as to be rotatable forward and backward with the left-right direction as the rotation axis direction.

Further, a cord 53 for supplying power to the two electric motors 33 and 44 is led out from the rear surface of the suction port main body 11.

Next, the structure of an electric circuit relating to the wheel motor 44 will be described with reference to FIG. This electric circuit is built in the suction port main body 11.

First, the structure of the driving means 61 including the motor 44 for the wheels will be described. A rectifier circuit 63 is connected to an external commercial AC power supply 62, and a resistor is connected between both output terminals of the rectifier circuit 63.
64, 65, diodes 66, 67 and field-effect transistor 68,
A series circuit with 69 is connected in parallel. In addition, an NPN is connected to the series circuit of the resistors 64 and 65 and the diodes 66 and 67.
The series circuit of the type transistors 71 and 72, the motor 44 for the wheel, and the diodes 73 and 74 is connected in parallel.

Further, the positive output terminal of the rectifier circuit 63 is connected to both terminals.
PN between the base of NPN type transitors 71 and 72
P-type transistors 75 and 76 and resistors 77 and 78 are connected in series, and the bases of both PNP transistors 75 and 76 are connected via resistors 79 and 80 to the intermediate point between the resistors 64 and 65 and diodes 66 and 67, respectively. Connected. Note that protection diodes 81, 82, 83 and 84 are connected between the emitters and collectors of the transistors 68, 69, 71 and 72, respectively.

Therefore, one field effect transistor
When the transistor 68 is turned on, a current flows through the diode 66, turning on one of the PNP transistors 75 and
NPN transistor 71 is turned on and transistor 7
1. An electric current flows through the path of the wheel electric motor 44 and the diode 73. On the other hand, when the other field-effect transistor 69 is turned on, a current flows through the diode 67 and the other PN
When the P-type transistor 76 is turned on, the other NPN
The mold transistor 72 is turned on, and a current flows through the path of the transistor 72, the motor 44 for the wheel, and the diode 74.

Thus, the current flowing through the motor 44 for wheels is reversed by turning on and off the field-effect transistors 68 and 69, and the motor 44 is rotated forward and backward.
Of course, if both field effect transistors 68, 69 are off, motor 44 is off.

The two pressure-sensitive variable resistance elements 26 and 27 are
A detecting means 91 is configured to detect a front-rear direction operation force applied from the outside to the suction port main body 11 by the user at the rotation shaft 22 of the communication pipe 21.

Reference numeral 92 denotes a main control means.
When a forward operation force is applied to the suction port main body 11 in response to a signal from the detection means 91, a signal for rotating the rear wheels 41, 42 in the forward direction is sent to the drive means 61, and the rearward operation of the suction port main body 11 is performed. When a force is applied, a signal for rotating the rear wheels 41 and 42 in the reverse direction is sent to the driving means 61. Specifically, the main control means 92 compares the resistance values of the two pressure-sensitive variable resistance elements 26 and 27, and when the resistance value of the pressure-sensitive variable resistance element 26 on the front side is smaller, one of the field-effect transistors 68 The transistor 68 is turned on by applying a voltage to the gate, and when the resistance value of the pressure-sensitive variable resistance element 27 on the rear side is smaller, a voltage is applied to the gate of the other field-effect transistor 69 to turn on the transistor 69. is there.

The main control means 92 includes a phase control means 93. The phase control means 93 has a time constant circuit and a triac, and outputs a time constant to the outputs from the pressure-sensitive variable resistance elements 26 and 27. The circuit is connected to adjust the input to the electric motor 44 by changing the on / off timing of the triac connected in series to the power supply and changing the waveform.

Reference numeral 94 denotes a sub-control means.
94 determines whether or not the pressure-sensitive variable resistance elements 26 and 27 have received a certain pressure or more based on the resistance values of the pressure-sensitive variable resistance elements 26 and 27. The means 92 is operated. In other words, the sub control means 94 turns off the signal for rotating the rear wheels 41, 42 from the main control means 92 to the driving means 61 when the pressure applied to the pressure-sensitive variable resistance elements 26, 27 is equal to or less than a certain pressure. Then, both the field effect transistors 68 and 69 are turned off.

Further, reference numeral 95 denotes a switching control unit serving as switching control means.
The electromagnetic clutch mechanism 47 is controlled in conjunction with driving or stopping of the electric motor 44 for wheels corresponding to turning on / off of 68 and 69. That is, when one of the field effect transistors 68, 69 is turned on, the switching control unit 95 causes the electromagnetic clutch mechanism 47 to connect the rear wheel 41,
42 are mechanically connected, and both field effect transistors 68, 69
When both are turned off, the rear wheels 41 and 42 are mechanically separated from the electric motor 44 for wheels by the electromagnetic clutch mechanism 47.

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

In cleaning, the tip of the extension pipe connected to the cleaner body via a hose is connected to the second communication pipe 25 in advance. Then, the user grips the end of the hose on the extension pipe side and moves the suction port body 11 with the rear wheels 41 and 42 and the front wheels 51 and 52 grounded on the surface to be cleaned mainly in the front-rear direction. While cleaning. At this time, the suction body 11
The first communication pipe 21 rotates vertically with respect to the second communication pipe 21 and the second communication pipe bent with respect to the first communication pipe 21.
By rotating the 25 in the circumferential direction, the state in which the suction port 20 faces the surface to be cleaned is easily maintained.

Dust is sucked into the suction chamber 16 from the suction port 20 of the suction port body 11 by driving of the electric blower provided in the cleaner body, and the air path chamber 18, the communication pipes 21, 25, and the extension are extended. It is guided through a pipe and a hose into the dust collection chamber of the cleaner body. When cleaning the carpet or the like, it is preferable to drive the electric motor 33 for the rotating brush to rotate the rotating brush 31, and to scrape dust from the carpet by the rotating brush 31.

When the user wants to move the suction port body 11 forward on the surface to be cleaned, the user pushes forward the end of the hose on the extension pipe side as shown by an arrow F1 in FIG. Power is
It is transmitted from the communication pipes 21 and 25 to the bearing 23 via the rotation shaft 22 thereof, and further transmitted from the bearing 23 to the suction port main body 11 via the front pressure-sensitive variable resistance element 26 as shown by an arrow F2. You. Since frictional resistance is applied to the suction port main body 11 from the surface to be cleaned, at least a part of the operation force applied by the user is applied as pressure to the pressure-sensitive variable resistance element 26 on the front side as described above. As a result, the resistance value of the front pressure-sensitive variable resistance element 26 changes according to this pressure.

On the other hand, when the suction port body 11 is to be run backward, the force pulled by the user backward as shown by the arrow F3, on the contrary, as shown by the arrow F4, the rear-side pressure-sensitive variable Resistance element
27 is applied as pressure. As a result, depending on this pressure,
The resistance value of the rear pressure-sensitive variable resistance element 27 changes.

On a floor surface such as a carpet or the like, which has poor running properties, that is, on a surface to be cleaned having a large resistance to the traveling of the suction port main body 11, a front-back operation force applied by the user to the suction main body 11 increases. As a result, the pressure-sensitive variable resistance elements 26, 27
However, when the resistance value of the pressure-sensitive elements 26 and 27 corresponding to this pressure becomes equal to or less than a set value, the main control means 92 is operated by the sub-control means 94, and the The electric motor 44 is driven, and the switching control unit 95 is operated in conjunction therewith, and the electric motor 44 for wheels is connected to the rear wheels 41 and 42 by the electromagnetic clutch mechanism 47.

At this time, in response to a signal from the detecting means 91, the main control means 92 controls the rear wheels by the electric motor 44 of the driving means 61.
The rotation speed is controlled by the rotation direction and phase control means 93 of 41 and 42. That is, when a forward operating force is applied to the suction port main body 11, the resistance value of the front pressure-sensitive variable resistance element 26 is lower than the resistance value of the rear pressure-sensitive variable resistance element 27. When a voltage is applied to the base of the transistor 68, the transistor 68 is turned on. In conjunction with this, the transistors 71, 75 are turned on, and the electric motor 44 rotates forward. Therefore, the rear wheels 41,
42 is driven to rotate in the forward direction.
Moves forward. On the other hand, when a backward operation force is applied to the suction port main body 11, the resistance value of the rear pressure-sensitive variable resistance element 27 is lower than the resistance value of the front pressure-sensitive variable resistance element 26. When a voltage is applied to the base of the transistor 69, the transistor 69 is turned on. In conjunction with this, the transistors 72 and 76 are turned on, and the motor 44 is reversed. Accordingly, the rear wheels 41 and 42 are driven to rotate in the reverse direction, whereby the suction port body 11 is retracted.

On the other hand, on a floor surface having good running properties, such as a space between plates, that is, on a surface to be cleaned having a small resistance to traveling of the suction port body 11, as a result, the operation force applied to the suction port body 11 by the user in the front-rear direction is reduced. Become smaller. As a result, the pressure applied to the pressure-sensitive variable resistance elements 26 and 27 also decreases, and the resistance value of the pressure-sensitive variable resistance elements 26 and 27 corresponding to this pressure increases.
The rotation speed of the electric motor 44 decreases according to the operation force.

Further, since the operating force decreases and the resistance values of the pressure-sensitive variable resistance elements 26 and 27 become equal to or higher than the set values, the sub-control means
By 94, the signal from the main control means 92 to the driving means 61 is turned off regardless of the resistance values of the pressure-sensitive variable resistance elements 26 and 27,
The transistors 68, 69, 71, 72, 75, 76 are all turned off. Therefore, the electric motor 44 for wheels is stopped. In conjunction with this, the electric motor is driven by the electromagnetic clutch mechanism 47.
The rear wheels 41, 42 are separated from 44, and these rear wheels 41, 42
Not only are not driven, but also can rotate freely independently of the electric motor 44.

Thus, on the surface to be cleaned, such as between the plates that can travel lightly, the rear wheels 41 and 42 do not resist the traveling of the suction port main body 11, so that the rear wheels 41 and 42 are not susceptible to small forward and backward movements. The suction port body 11 can easily move freely,
Easy to clean even in small places.

Further, at this time, the motor 44 for wheels is automatically stopped, and there is no need to manually stop the motor 44, so that operability is good.

On the other hand, when the suction port main body 11 travels and requires a certain operating force or more for traveling, as described above, the pressure applied to the pressure-sensitive variable resistance elements 26 and 27 increases. As a result, the rear wheels 41 and 42 are rotationally driven by the electric motor 44, and the speed is increased according to the operating force.
Will be able to help the run.

That is, as shown in FIGS. 5 and 6,
When the operating force exceeds a certain set value, the input to the electric motor 44 increases substantially in proportion, so that unlike the conventional example shown in FIGS. In addition, proper rotation can be obtained on any floor surface. Also, the input to the electric motor 44 has a smaller voltage difference at the time of starting and stopping at the time of ON compared to the conventional example shown in FIG.
The occurrence of pulse noise is also reduced.

Further, when the user temporarily lifts the suction port body 11 into the air during cleaning, no operation force is applied to the communication pipe 21 in the front-rear direction, and the gravity acting on the suction port body 11 causes Both pressure-sensitive variable resistance elements 26 of the bearing 23 of the communication pipe 21
27 moves away from the support wall 24, and similarly, the pressure applied to both pressure-sensitive variable resistance elements 26 and 27 becomes equal to or lower than a predetermined pressure.

Therefore, the main control means 92 is not operated by the sub-control means 94, and the rear wheels 41 and 42 are stopped even if they have been rotated up to that time. In this way, when the suction port body 11 is floated in the air, the rear wheels 41 and 42 do not rotate, so that hands are not pinched between the rotating rear wheels 41 and 42 and hair is not entangled. Is safe.

Next, detection means 100 of another embodiment will be described.

As shown in FIG. 11, the detecting means 100 has an opening 102 formed in the lower surface of a suction port main body 101, and a rotatable cylinder 103 is provided in the opening 102.
A projection 104 is formed on 103. And this cylindrical body 10
A winding spring 105 is attached to 3, and the projection 104 of the winding spring 105 is urged so as to face directly below the neutral position. In addition, an impedance means is provided above the cylindrical body 103.
111 are provided. This impedance means 111
Has an arc-shaped resistor 112 coaxial with the cylindrical body 103,
The resistor 112 is driven by the rotation of the cylindrical body 103 and
The contact 113 that comes into contact with the contact 112 comes into contact.

The control circuit of the detection means 100
As shown in FIG.

A rectifier circuit is provided between the output terminals of the commercial AC power supply 62.
63 is connected, and a contact 113 is connected to the positive output terminal of the rectifier circuit 63. The contact 113 comes into sliding contact with the resistor 112. And this resistor 11
2 are connected to input terminals of the electric motor 44. A switch 114 linked to the contact 113 is connected to the negative terminal of the rectifier circuit 63, and the switch 114 is further connected to both ends of the electric motor 44.

The operation of this embodiment will be described.

First, when the suction port main body 101 is stopped, the protruding portion 104 is located immediately below as shown in FIG. 11, and the contact 113 and the switch are provided as shown in FIG.
114 is in the state shown in a. Then, an equivalent circuit as shown in FIG. 17 is obtained, and no current is supplied to the electric motor 44 as shown in FIG.

When the suction port main body 101 is slightly advanced, the projection 104 is positioned slightly rearward as shown in FIG. 10, and the contact 113 and the switch 114 are shown by b in FIG. It becomes a state of direction. And FIG.
It becomes an equivalent circuit as shown in FIG.
Supply current in the direction to rotate 44 forward. Therefore, the current supplied to the electric motor 44 is small as shown in FIG.

Further, when the suction port main body 101 is advanced,
As shown in FIG. 9, the projection 104 is located rearward, and as shown in FIG.
Becomes the state shown in b. Then, an electric current is directly supplied to the electric motor 44 in an equivalent circuit as shown in FIG. Therefore, a large current is supplied to the electric motor 44 as shown in FIG.

On the other hand, when the traveling direction of the suction port main body 101 is reversed and slightly retracted, the projection 104 is positioned slightly forward as shown in FIG. 12, and as shown in FIG. The switch 114 is in the state shown in c. Then, an equivalent circuit as shown in FIG.
A current is supplied via 112 in the direction of reversing the electric motor 44. Therefore, the current supplied to the electric motor 44 is small as shown in FIG. At this time, FIG. 16 and FIG.
After the circuit state shown in FIG. 7, the length of current flowing through the resistor 102 is increased to increase the impedance value.
As shown in FIG. 0 and FIG. 21, the current is gradually decreased, the current is once turned off, and then the current is inverted.
No large current flows or no pulse noise occurs.

Further, when the suction port main body 101 is retracted,
As shown in FIG. 13, the projection 104 is positioned forward, and as shown in FIG.
Becomes the state shown in c. Then, an electric current is directly supplied to the electric motor 44 in an equivalent circuit as shown in FIG. Therefore, a large current is supplied to the electric motor 44 as shown in FIG.

Further, when the traveling direction of the suction port main body 101 is reversed and then slightly advanced, the projection 104 is positioned slightly rearward. Then, a current in a direction for rotating the electric motor 44 forward is supplied. At this time, FIG. 18 and FIG.
After the circuit state shown in FIG. 7, the length of current flowing through the resistor 102 is increased to increase the impedance value.
As shown in FIG. 1 and FIG. 22, the current is gradually decreased, the current is once turned off, and then the current is inverted.
No large current flows or no pulse noise occurs.

Therefore, the current flowing through the motor 44 is determined by the impedance value of the resistor 112,
The current value is changed continuously even when the motor 44 is reversed, so that a large current is prevented from flowing.

Further, the suction port main body 101 stops, and the projection 104
When is located immediately below, turning off the switch 114 causes no current to flow and does not rotate the electric motor 44, so that the rear wheels 41 and 42 do not rotate. It is safe without pinching or entanglement of hair.

Further, since the projection 104 is urged directly downward, the motor 44 is always stopped when the suction port main body 101 is lifted, which is safe.

In each of the above embodiments, the running means is a rear wheel, but may be a cleaning body such as a rotating brush or a blade.

[0061]

According to the first aspect of the present invention, when the user attempts to run the suction opening main body on the surface to be cleaned while the running means is grounded during cleaning, the suction opening body of the vacuum cleaner according to the first aspect of the present invention can be used. Detection means consisting of a pressure-sensitive element detects the operation force and the strength in the front-rear direction applied from the outside to the suction port main body by the user,
The main control means sends a signal to the driving means in response to the signal from the detecting means, and the clutch means outputs the output of the driving means to the traveling means.
Transmission, and controls the rotational direction and speed of the traveling means by the drive means. Therefore, the speed of the suction port body can be set according to the strength of the operating force, and the input to the electric motor is continuously changed in order to continuously change the speed. compared, wear pulse noise small <br/> of Kude. When the motor stops, the switching control means
The transmission of the driving means and the traveling means is performed by the clutch means.
Not only do not drive the driving means, but also
Do not drag the traveling means on the floor when stopping
Damage to the means and the floor surface can be prevented.

In the suction body of the vacuum cleaner according to the present invention, when the user attempts to run the suction body on the surface to be cleaned while the running means is grounded during cleaning, the detection means is provided. Is rotated, the front-rear operation force applied to the suction port body by the user from the outside is detected, and the impedance value is reduced in accordance with the increase in the amount of rotation, and the clutch means is driven by the drive means.
The force is transmitted to the traveling means to drive the electric motor of the driving means,
The rotation direction and speed of the traveling means by the electric motor are controlled. Further, at the neutral position of the detecting means, the impedance is high, so that the power supplied to the motor decreases. When the motor is inverted, the power always passes through the neutral position. To prevent flow. Therefore, the speed of the suction port body can be set according to the strength of the operating force, and the input to the electric motor is continuously changed in order to continuously change the speed. compared, Ru-out small Kude <br/> pulse noise. When the motor is stopped, it is driven by the switching control means.
Transmission of means and running means is separated by clutch means
Not only do not drive the running means, but also when the motor is stopped.
Do not drag the running means on the floor
And floors can be prevented from being damaged.

[Brief description of the drawings]

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

FIG. 2 is a side view showing a part of the above as a cross section.

FIG. 3 is a perspective view showing a pressure-sensitive element portion of the same.

FIG. 4 is a plan view partially cut away from the above.

FIG. 5 is a graph showing a relationship between an electric motor input and floor resistance.

FIG. 6 is a graph showing a relationship between the operation load and the resistance of the floor surface.

FIG. 7 is a graph showing a relationship between a motor input and a floor resistance according to a conventional example.

FIG. 8 is a graph showing a relationship between an operation load and a floor resistance according to a conventional example.

FIG. 9 is a cross-sectional view illustrating a case where a detection unit according to another embodiment moves forward.

FIG. 10 is a cross-sectional view showing a case where the detection unit has slightly advanced.

FIG. 11 is a sectional view showing a case where the detecting unit is in a neutral state.

FIG. 12 is a cross-sectional view showing a case where the detection unit has retreated slightly.

FIG. 13 is a cross-sectional view showing a case where the detecting unit is retracted.

FIG. 14 is a circuit diagram showing a control circuit of the detecting means according to the second embodiment;

FIG. 15 is an equivalent circuit diagram showing a case where the detection unit moves forward.

FIG. 16 is an equivalent circuit diagram showing a case where the detection unit advances slightly.

FIG. 17 is an equivalent circuit diagram showing a case where the detection unit is in a neutral state.

FIG. 18 is an equivalent circuit diagram showing a case where the detection unit is slightly retreated.

FIG. 19 is an equivalent circuit diagram showing a case where the detection unit moves backward.

FIG. 20 is a diagram showing a current waveform supplied when the detecting means moves forward.

FIG. 21 is a diagram showing a current waveform supplied when the detecting means advances slightly.

FIG. 22 is a diagram showing a current waveform supplied when the detecting means is in a neutral state.

FIG. 23 is a diagram showing a current waveform supplied when the detecting means retreats slightly.

FIG. 24 is a diagram showing a current waveform supplied when the detecting means moves backward.

[Explanation of symbols]

11 Suction port body 16 Suction chamber 21, 25 Communication pipe 26, 27 Pressure-sensitive variable resistance element 41, 42 as pressure-sensitive element Rear wheel 44 as running means 44 Electric motor 47 Electromagnetic clutch mechanism as clutch means 61 Drive means 91, 100 Detection means 92 Main control means 95 Switching control section 111 as switching control means 111 Impedance means

Continuation of the front page (56) References JP-A-63-49116 (JP, A) JP-A-3-275024 (JP, A) JP-A-2-224630 (JP, A) JP-A-4-30824 (JP) JP-A-4-28810 (JP, A) JP-A-2-144030 (JP, A) JP-B-54-28673 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB Name) A47L 9/00 102 A47L 9/02-9 / 04,9 / 28

Claims (2)

(57) [Claims] 1. A suction port body having a suction chamber with an open lower surface, a traveling means provided in the suction port body so as to be rotatable in forward and reverse directions, and an electric motor for driving the traveling means in forward and reverse directions at a variable speed. The drive means, and the transmission between the drive means and the traveling means can be brought into contact with and separated from the drive means.
Clutch means provided, and the drive means and the front when the motor of the drive means is stopped.
The transmission of the traveling means is disconnected by the clutch means.
Exchange control means, detection means having a pressure-sensitive element for detecting an operation force in the front-rear direction applied to the suction port main body from the outside in the front-rear direction, and outputting an output that changes in accordance with the operation force. When a forward operation force is applied to the suction port main body, a signal for rotating the traveling means in the forward direction is applied.When a rearward operation force is applied to the suction port body, a signal for rotating the traveling means in the reverse direction is applied to the operation force. Ri in accordance with the output sent to the drive means, the pressure-sensitive element is
If the detected operating force is equal to or less than a predetermined value, the motor is stopped.
Suction port body of the electric vacuum cleaner, characterized by comprising a main control unit Ru is. 2. A suction port main body having a suction chamber having an open lower surface, a traveling means supported by the suction port main body so as to be rotatable in forward and reverse directions, and an electric motor for driving the traveling means to rotate forward and reverse at a variable speed. The drive means, and the transmission between the drive means and the traveling means can be brought into contact with and separated from the drive means.
Clutch means provided, and the drive means and the front when the motor of the drive means is stopped.
The transmission of the traveling means is disconnected by the clutch means.
Switching control means, detecting means for detecting the front-rear direction of an operation force externally applied to the suction port main body by being urged to a neutral position and rotating, the impedance value of the detecting means at the neutral position being high, An inlet for an electric vacuum cleaner, comprising: impedance means for lowering an impedance value in accordance with an increase in the amount of rotation to supply a current to the electric motor.