| 摘要 |
A suction inlet unit ( 30 ) comprises a suction inlet main body ( 31 ) having a bottom suction inlet ( 32 ), a front suction inlet ( 46 ) formed continuously with said bottom suction inlet ( 32 ) in the front of said suction inlet main body ( 31 ), and a cover ( 50 ) for covering the front suction inlet ( 46 ). The cover, provided at the suction inlet main body ( 31 ) movable by an adjusting mechanism for adjusting an opening area size of said front suction inlet ( 46 ) to a determined area, is configured to decrease the opening area of the front suction inlet ( 46 ) when a front portion of the cover 50 is contacted by a wall or furniture.
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