| 摘要 |
PROBLEM TO BE SOLVED: To provide a passage switching device with a very simple constitution capable of decreasing a driving force and securing sufficient airtightness at the same time without causing noises at the time of switching. SOLUTION: A passage switching door 70 moves along a partition wall 98 by the rotation of pinions 102a, 102b engaged with racks 82a, 82b. At this time, a shielding sheet 92 wound onto a frame member 72 rotates around rollers 86a, 86b together with the movement of the passage switching door 72, thereby opening a second opening 68 while closing a first opening 66. When the first opening 66 is closed by the passage switching door 70, the shielding sheet 92 is pressed to the partition wall 98 through seal members 80a, 80b provided in the frame member 72 and the rollers 86a, 86b. Thus, the airtightness of the first opening 66 is secured. COPYRIGHT: (C)2005,JPO&NCIPI
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