| 摘要 |
PURPOSE: A cleaning blackboard is provided to enhance the quality of the product and the efficiency by making an erase of a blackboard surface in a short time possible and preventing from the arsenic acid of a chalk powder. CONSTITUTION: A cleaning blackboard comprises: a blackboard(10) having an open part(12) on the blackboard protection frame(11) to expose a writing surface(13); a cleaning member(20) installed outside of a support pipe(21) to clean the writing surface; a motive power gear(41) supported by a motor spindle(43) to rotate the cleaning member; and a rotation part(40) installed on the base of the motive power motor and having a first gear(44).
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