| 摘要 |
<p>Disclosed is a device having a cylindrical duster moving along a certain section and dusting off a chalk powder of a blackboard eraser. When cleaning a blackboard eraser, a chalk power should be dusted off by heating the eraser on a flat surface or bumping two blackboard erasers to dust off the chalk powder. Moreover, a machine using a method of absorbing a powder exists, but the machine generates great noise, and cannot absorb the powder well to clean the blackboard eraser. The duster of a blackboard eraser comprises a movable fixing plate and fixer fixing a blackboard eraser; a brush having right brush rotating in a counter clockwise direction, and having a left brush rotating in a clockwise direction to form a descending air current to be moved along the edge shape of the blackboard eraser; a filter including a film having a hole size smaller than a chalk powder for the powder not to escape, and passing only air; and a path becoming narrower downward for the chalk powder to be easily fallen down. The duster of a blackboard eraser not only prevents contamination and dirt of surrounding environment caused by scattered powder, when directly dusting off with the hand, but also has convenience of not needing direct force of the hand. In addition, noise is less than an absorption type eraser duster widely used before, and a powder is dusted off without remaining for a blackboard eraser to be reused clean.</p> |
