| 摘要 |
PROBLEM TO BE SOLVED: To prevent a foreign matter from entering the interior of a dustproof device by climbing over inner side cover members when air blowing is applied from below an outer side cover members. SOLUTION: A dustproof device has an upper cover member 64 having a through hole 60 provided in a sliding member 18 straightly moved with guide by guide rails 14; inner side cover parts 46 having a height dimension slightly lower than the lower face of the sliding member 18; and outer side cover members 70 interposed at the exteriors of the sliding member 18. The outside face 48 of each inner side cover part 46 is formed in a recessed shape inwardly recessed in the upward and downward directions. Applying air blowing from below the outer side cover members 70 blows up, along the outside faces 48, a foreign matter on a flange 4 in the portion finding the absence of the sliding member 18 within its moving range. The result outwardly discharges the foreign matter by climbing over the outer side cover members 70.
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