| 摘要 |
<P>PROBLEM TO BE SOLVED: To easily and quickly switch the state of a plurality of preliminary seedling placing bases by automatically changing the attitude of movable stoppers in association with switching the state of the plurality of preliminary seedling placing bases. <P>SOLUTION: The plurality of preliminary seedling placing bases can be switched into an overlapping state in which the plurality of preliminary seedling placing bases overlap in vertical multistages in a plan view and into a deployed state in which the plurality of preliminary seedling placing bases are deployed in a substantially straight line in a longitudinal direction. The preliminary seedling placing bases are provided with the movable stoppers 270, 280 constituted to be changeable into a working attitude of impeding the movement of seedlings placed on the preliminary seedling placing bases and into a non-working attitude of permitting the movement of seedlings placed on the preliminary seedling placing bases. When the presence of seedlings is detected by a detecting means for detecting the presence/absence of seedlings placed on the preliminary seedling placing bases, the movable stoppers 270, 280 are changed into the working attitude, and when the absence of seedlings is detected by the detecting means, the movable stoppers 270, 280 are changed into the non-working attitude. <P>COPYRIGHT: (C)2013,JPO&INPIT |
