| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve operability deterioration of a suction port body which occurs when the rotation of a rotary brush stops. Ž<P>SOLUTION: In strong operation ("Yes" at step 10), when the operation of the rotary brush stops ("Yes" at step 11), electric power lower than that in the strong operation (higher than electric power in intermediate operation being standard operation, and that in weak operation) is supplied to an electric blower 9 (step 12). Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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