| 摘要 |
PROBLEM TO BE SOLVED: To prevent a foreign matter from entering through an opening of the floor surface for sucking down a door by blocking up the opening of the floor surface from the inside of a pit, and providing guide rollers for guiding a belt member in the vertical direction according to the opening and closing operation of the door. SOLUTION: Foreign matter dropped in a pit 23 through an opening 3 of the floor surface in an area where a door 2 is not present is placed on a belt member 9 for blocking up the opening 3 of the floor surface from the inside of the pit 23. When the door 2 is opened and closed, a foreign matter on the belt member 9 is swept up together to both ends in the opening and closing direction of the door by a brush member (a first dust collecting member) 26. As a brush member (a second dust collecting member) 27 is provided on both ends in the cross direction of the belt member 9, the foreign matter can be prevented from being spilt from the belt member 9. Even if a foreign matter from the belt member 9 drops, it drops on a rail cover 29. Accordingly, the generation of noise and an increase of opening and closing resistance due to the foreign matter caught between a sash roller 5 and the rail main body 41 can be prevented. |
