| 摘要 |
An electric blackboard eraser of the present invention comprises a case having one side opened and having a detachable dust-collecting canister; a first shaft supported by a bearing inside the case to be rotated; a first roller filter made of a buffer material surrounding the outer surface of the first shaft, and rotated while one part exposed through an opened side of the case is attached to a blackboard, and adsorbing a blackboard chalk; a second shaft arranged in parallel at one side of the first shaft and supported to be rotated; a second roller filter surrounding the outer surface of the second shaft, and rotated while being attached to the blackboard and adsorbing a blackboard chalk; a transfer screw having a transfer helix rotated while attached between the first and second roller to scrape the chalk powder adsorbed onto the outer surfaces of the first and second roller filter and transfer to the dust-collecting canister; and a drive motor installed inside the case and receiving power supply by a swithch signal and delivering to the first and second roller filter and the transfer screw and connected to the first and second roller filter and the transfer screw by gear coupling. According to the present invention, the convenience of use is improved to satisfy consumers, and the structure is simple to be easily and economically maintained and repaired. In addition, the collection efficiency for a chalk powder is increased, and the contamination of the roller filter is minimized even being used for a long time. |
