| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a ventilation device in which a member for adjusting the ventilation is hardly deteriorated, and powder dust is not generated near a ventilation flow channel in adjusting air volume. Ž<P>SOLUTION: This ventilation device 61 having an opening section 76 for circulating a gas, includes a sheet 66, and one end of the sheet 66 is fixed near the opening section 76. The other end of the sheet 66 is moved in the direction to block the opening section 76, so that an intermediate section of the sheet 66 is passed through the opening section 76 and the opening section 76 is pressed by a pressure of the gas passing through the opening section 76 at that time. An effective opening area of the opening section 76 can be changed by moving the sheet 66 pressed to the opening section 76. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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