JPH0732749B2 - Driving method of electric suction tool in vacuum cleaner - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of driving an electric suction tool in an electric vacuum cleaner having an electric agitator and a drive roller.

2. Description of the Related Art Conventionally, in a suction tool of an electric vacuum cleaner having an agitator, the rotation direction of the agitator is always fixed. The rotation direction is set to be the forward direction when the suction tool is moved forward. However, in this case, the agitator becomes an operational resistance when the suction tool is retracted, and when it is advanced, the operability is certainly good, but the dust scraping property is poor. As described above, in the case where the rotation direction of the agitator is fixed, it is impossible to improve both the operability and the dust scraping property.

Therefore, in order to solve the above-mentioned problems, conventionally, various things have been considered, one with a focus on improving operability and the other with a focus on improving dust scraping performance.

For example, in the one disclosed in Japanese Patent Laid-Open No. 58-94823, the forward movement and the backward movement of the suction tool are detected by the movement detection means, the rotation direction of the electric motor is switched each time, and the rotation direction of the agitator is changed to that of the suction tool. Some have been reversed so that the direction of movement is forward, that is, the rotation of the agitator assists the movement of the suction tool.

The one described in JP-A-57-148924 uses an air turbine as a drive source, and reverses rotation by changing the air blowing direction to the air turbine according to the forward movement and the backward movement of the suction tool, Again, the rotation direction of the agitator is always the forward direction of the moving direction of the suction tool.

On the contrary to the air turbine type suction tool described in Japanese Utility Model Laid-Open No. 60-9450, the rotation direction of the agitator is always opposite to the moving direction of the suction tool by switching the meshing of gears. I'm trying to flip it.

Further, the one described in Japanese Patent Laid-Open No. 56-68418 detects the forward movement and the backward movement of the suction tool by the movement detection means, switches the rotation direction of the electric motor each time, and changes the rotation direction of the agitator with respect to the movement direction of the suction tool. So that they are always reversed in the opposite direction.

Japanese Utility Model Laid-Open No. 60-134448 and Japanese Patent Publication No. 48-2743 have a so-called drive roller for assisting the movement of the suction tool so that the suction tool can be moved forward and backward in the same direction. I am trying to turn the rollers over.

In the one disclosed in Japanese Utility Model Laid-Open No. 55-101546, the drive roller is rotated in the forward direction only when moving forward, and the drive roller is separated from the driving source when moving backward so that the suction roller is driven to rotate backward. .

In Japanese Utility Model Publication Nos. 54-24268, 59-70654, and 59-174143, a pair of agitators, which are rotationally driven in opposite directions, are installed in front of and behind the suction tool. is doing.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention In the above conventional suction device, as described in JP-A-58-94823 and JP-A-57-148924,
The one that reverses the rotation direction of the agitator to the forward direction of the suction tool movement is improved in terms of operability, but the relative movement amount of the agitator with respect to the carpet, that is, the scraping movement amount is small. As a result, the dust collection characteristic itself deteriorates.

On the contrary, the suction tools described in Japanese Utility Model Laid-Open No. 60-9450 and Japanese Patent Application Laid-Open No. 56-68418 are arranged such that the rotation direction of the agitator is always opposite to the moving direction of the suction tool. Since it was reversed, the scraping characteristics of the dust collection were improved, but there was a problem that the operation became heavy by that amount.

The models described in Japanese Utility Model Laid-Open No. 60-134448, Japanese Patent Publication No. 48-2743, and Japanese Utility Model Laid-Open No. 55-101546 have a drive roller, so the operability is good, but on the other hand, rotation of the agitator Since the direction is fixed, there was also a problem in terms of dust collection characteristics.

As described above, none of the conventional suction tools have both dust collection characteristics and operation characteristics.

Further, like those described in Japanese Utility Model Publication No. 54-24268, Japanese Utility Model Publication No. 59-70654 and Japanese Utility Model Publication No. 59-174143,
If a pair of agitators that are driven to rotate in opposite directions are arranged in front of and behind the suction tool, it will be possible to achieve both the dust collection characteristics and the operation characteristics to some extent.

However, arranging the pair of agitators in front of and behind the suction tool leads to an increase in the size of the suction tool, which leads to a fatal defect as the suction tool when cleaning a narrow space.

The present invention has solved such a conventional problem, and aims to achieve both dust collection characteristics and operation characteristics with a small suction tool.

Means for Solving the Problems The method of the present invention for achieving the above object is provided in a suction tool body operated to reciprocate on a surface to be cleaned and a suction chamber of the suction tool body. An agitator that is rotatably driven by a first electric motor, a drive roller that is disposed at the bottom of the suction tool body and that is rotatably driven by a second electric motor, and a moving direction detection unit of the suction tool body. The rotation directions of the first and second electric motors are set so that the rotation directions of the agitator and the drive roller are opposite to each other, and based on the detection result of the movement direction detection unit, the rotation direction of the suction tool main body is changed. The rotation directions of the first and second electric motors are switched so that the rotation direction of the agitator rotates in the reverse direction and the rotation direction of the drive roller rotates in the forward direction. .

Operation According to the driving method of the present invention, since the agitator is reversely controlled to rotate in the direction opposite to the moving direction of the suction tool body, the relative movement amount of the agitator with respect to the carpet, that is, , The amount of movement for scraping increases. Then, although the operation load increases correspondingly, the actual operation force becomes small because the rotation direction of the drive roller is reversed so as to rotate in the forward direction with respect to the moving direction of the suction tool body. .

Example Hereinafter, the example will be described with reference to the accompanying drawings.

In FIGS. 1 to 4, an electric vacuum cleaner body 2 having an electric blower 1 inside and a dust collecting portion (not shown) on its suction side and an electric suction tool 3 are an extension pipe 4a and a hose 4b. Are connected and connected via. The power cord 5 led out from the electric vacuum cleaner body 2 using the conductor embedded in the hose 4b follows the longitudinal direction of the outer circumference of the extension tube 4a and the electric suction tool 3
Is electrically coupled to.

The electric suction tool 3 has a suction chamber 6 opened at the bottom face in front of the suction tool body 7, and a part of the suction chamber 6 is
An auxiliary hose 8 whose one end communicates with the extension pipe 4a is connected. In the longitudinal direction of the suction chamber 6, an agitator 9 in which an agitator comes into contact with the surface to be cleaned is rotatably arranged, and rotation of a first electric motor 10 provided on one side inside the suction tool body 7 is rotated via a belt 11. I got to receive it. At the bottom of the suction tool body 7 located behind the agitator 9, there is disposed a drive roller 12 that rotates in contact with the surface to be cleaned. The drive roller 12 is provided on the other side of the suction tool body 7. 2 The electric motor 13 is adapted to be received via a rotary belt 14.

Numeral 15 is a supporting wheel located on both rear sides of the suction tool body 7, which is attached to both ends of a shaft 16 which penetrates the suction tool body 7 in the horizontal direction. A pair of arms 17 extend from both sides of the tip of the extension pipe 4a, and a substantially triangular hole 18 formed at each tip is fitted to the shaft 16. Ie extension tube
4a is displaceable in a vertical direction about an axis 16 via an arm 17.

When advancing the suction tool body 7, a pushing force is applied to the extension tube 4a. This causes the arm 17 to move relative to the shaft 16 until the shaft 16 hits the trailing edge of the hole 18, and then a forward force acts on the suction tool body 7.

Conversely, when retracting the suction tool body 7, a tensile force is applied to the extension tube 4a. This ensures that the shaft 16
The arm 17 moves relative to the shaft 16 until it hits, and then the retracting force acts on the suction tool body 7.

In other words, the suction tool body 7 moves in the direction of the hole 18 with respect to the shaft 16.
Can be detected by the relative position of the arm 17, in other words, the relative position of the arm 17 with respect to the shaft 16, and these constitute a moving direction detection unit 19.

Reference numerals 20 and 21 denote a first changeover switch and a second changeover switch, which are provided in front of each of the arms 17 constituting the moving direction detecting section 19 so as to face each other.

As shown in FIG. 4, two diodes 2 are provided between the first electric motor 10 serving as the rotation driving source of the agitator 9 and the commercial power source 22.
3,24 are connected in parallel and with opposite characteristics. On the other hand, two diodes 25 and 26 are also connected in parallel between the second electric motor 13 serving as the rotation driving source of the drive roller 12 and the commercial power source 22 and in reverse characteristics.

The first and second changeover switches 20 and 21 are diodes 23 and 24, respectively.
And the diodes 25 and 26 as alternatives, the first and second electric motors 10 and 13
The switch connection is made with respect to.

Further, the first and second changeover switches 20 and 21 have actuators 20a and 21a, respectively. Then, when the actuators 20a, 21a are not operating, that is, when the suction tool retracting movement in which the arm 17 configuring the movement direction detecting portion 19 is positioned rearward with respect to the shaft 16, the first changeover switch 20 is The second selector switch 21 is switched to the diode 23 side and to the diode 26 side, respectively.
At this time, the first electric motor 10 rotates the agitator 9 in a direction opposite to the backward movement of the suction tool body 7, and the second electric motor 13 moves in the forward direction with respect to the backward movement of the suction tool body 7. The drive roller 12 is rotated so as to become (see solid arrow in FIG. 1).

Further, when these actuators 20a and 21a are pressed by the arm 17, that is, the moving direction detection unit 19
When the arm 17 forming the above is positioned forward with respect to the shaft 16, the first selector switch 20 moves the diode 24
, The second changeover switch 21 can be changed over to the diode 25 side. At this time, the first electric motor 10
The rotation direction of the suction tool body 7 is also switched, and the agitator 9 is switched and rotated so as to be opposite to the forward movement of the suction tool body 7, and the second electric motor 13 moves forward with respect to the forward movement of the suction tool body 7. After that, the drive roller 12 is turned off and rotated so as to become (Fig. 1, dotted line arrow).

In FIG. 4, 27 is a power switch.

In the above-described configuration, the electric suction tool 3 is reciprocatingly operated on the surface to be cleaned in a state where the operator grips the upper operation portion of the extension tube 4a with a hand. The dust on the surface to be cleaned is scraped up by the agitator 9 of the electric suction tool 3, and the suction chamber 6 → the auxiliary hose 8 →
It flows from the extension pipe 4a to the hose 4b and is filtered in the dust collecting chamber of the electric vacuum cleaner body 2.

As described above, the driving of the agitator 9 and the drive roller 12 in the electric suction tool 3 is set such that their rotation directions are opposite to each other, and based on the detection result of the moving direction detection unit 19, the agitator 9 and the drive roller 12 are driven. Is rotated in the opposite direction to the moving direction of the suction tool body 7, and the drive roller 12 is rotated in the forward direction.

Therefore, the amount of relative movement of the agitator 9 with respect to the surface to be cleaned such as a carpet, that is, the amount of scraping movement increases, and as a result, very good dust collection characteristics can be obtained.

By the way, the rotation of the agitator 9 becomes a resistance against the moving direction of the suction tool body 7, and the operation load increases accordingly, but a drive roller that rotates in the forward direction with respect to the moving direction of the suction tool body 7. With 12, the actual operating force is small and the usability is improved.

As described above, according to the present invention, the rotation directions of the agitator and the drive roller are set to be opposite to each other, and the suction tool body is rotated in the opposite direction based on the detection result of the movement direction detection unit. By changing the rotation direction of the agitator and changing the rotation direction of the drive roller so as to rotate in the forward direction, the conditions that conflict with the improvement of the dust collection characteristics and the reduction of the operating force of the electric suction tool are both satisfied. It is satisfactory and can be put together in a small-sized suction tool, so that the efficiency and the usability can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of an electric suction device showing an embodiment of the present invention, FIG. 2 is an internal plan view, FIG. 3 is a perspective view showing the entire structure, and FIG. 4 is a circuit diagram. Is. 3 ... Electric suction tool, 6 ... Suction chamber, 7 ... Suction tool body, 9 ... Agitator, 12 ... Drive roller, 19
...... Movement direction detector.

Claims (1)

[Claims] 1. A suction tool main body which is operated to reciprocate on a surface to be cleaned, and a suction chamber of the suction tool main body,
An agitator that is rotationally driven by a first electric motor; a drive roller that is arranged at the bottom of the suction tool body and that is rotationally driven by a second electric motor; and a moving direction detection unit of the suction tool body. The rotation directions of the first and second electric motors are set so that the rotation directions of the agitator and the drive roller are opposite to each other, and based on the detection result of the movement direction detection unit, with respect to the movement direction of the suction tool body, The electric motor in the electric vacuum cleaner is characterized in that the rotation directions of the first and second electric motors are switched so that the rotation direction of the agitator is reverse and the rotation direction of the drive roller is forward. Type suction tool driving method.