| 摘要 |
PURPOSE:To prevent entering of dust and to retain performance for a long time by a method wherein a movable member which descends forward of a reed switch is provided and a projection which makes the descending movable member ascend is provided at a lower part of an air filter. CONSTITUTION:When an air filter 5 is removed, as a movable member 11 comes down forward of a reed switch 7, a suction grill 4 cannot be closed completely without the air filter 5, and further as the movable member 11 prohibits an approach of the reed switch 7 and a magnet 6 on a lower and rear part of the suction grill 4, the reed switch 7 cannot be turned ON. This informs that the air filter 5 is not mounted. When the air filter 5 is mounted, the movable member 11 which is now in front of the reed switch 7 is made to ascend by a projection 13 provided at a lower part of the air filter 5. After mounting the air filter 5, the suction grill 4 can be closed in a usual state, and therefore, the reed switch 7 can be turned ON. |
