| 摘要 |
A vacuum cleaner includes an automated air quantity adjusting mechanism which has good linearity and has no hysteresis. The automated air quantity adjusting mechanism includes an exhaust opening section 7a formed within a cylindrical body 7. A flange 26 provides the exhaust opening section 7a at the lower section of a supporting body 6 which supports an electric generator 9. A guide shaft 21 is provided at a central section of the exhaust opening section 7a in a standing manner which guide shaft has a stopper member 24 at its uppermost edge section. The mechanism further includes a circular plate shaped valve 22 in which the guide shaft 21 is passed therethrough, and a returning coil spring 25 for pushing the valve 22 towards the stopper 24. The valve 22 is moved downward by negative pressure within an air suction passage 2 so that a distance between the valve 22 and the exhaust opening section 7a is changed and an air quantity flowing towards the air suction passage 2 through the exhaust opening section 7a is adjusted.
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