| 摘要 |
A round arch type guide rail (13) was installed in the inner part of the greenhouse (23), and a reduction gear (20) with a motor (19) was fixed below the guide rail. When it's necessary opening the nonwoven fabrics according to the elevation of the room temp., a motor (19) is driven. At this time, a rectangular chain (18) connected to the reduction gear is rotated together. Tapered gears (2,2a) are also rotated with the rectangular chain, therefore elevation member (1) is elevated together.
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