PROBLEM TO BE SOLVED: To narrow the turning range of a movable backup seedling tray upon switching between an overlapped state and an expanded state.SOLUTION: A fixed backup seedling tray 83m fixed to a support member 9 fixed to a vehicle body for placing backup seedlings thereon link members 84a and 84b turnably attached to supporting points 89a and 89b of the support member 9 link assisting members 84c, 85a, 84d, and 85b turnably attached to the front ends of the link members 84a and 84b and movable backup seedling trays 83u and 83d fixed to second ends of the link assisting members 84c, 85a, 84d, and 85b are provided. The movable backup seedling trays 83u and 83d are switchable between the state in which they are vertically overlapped and the expanded state in the front-back direction with respect to the fixed backup seedling tray 83m in accordance with turning of the link members 84a and 84b. In the overlapped state, a second end 85a1 of the link assisting member is positioned to be close to the supporting point 89a, and the movable backup seedling tray 83u is arranged to be close to the supporting point 89a more than the front end 84a1 of the link member 84a.COPYRIGHT: (C)2012,JPO&INPIT【課題】重複状態と展開状態の切り換え時における、可動予備苗載台の回動範囲を狭くする。【解決手段】車体に固定された支持部材9に固定され、予備の苗を載せるための固定予備苗載台83mと、支持部材9の支点89a,89bにおいて回動可能に取付けられたリンク部材84a,84bと、リンク部材84a,84bの先端に回動可能に取り付けられたリンク補助部材84c,85a,84d,85bと、リンク補助部材84c,85a,84d,85bの他端に固定された可動予備苗載台83u,83dとを備え、可動予備苗載台83u,83dは、リンク部材84a,84bの回動に応じて、固定予備苗載台83mに対して、上下方向に重複する状態と前後方向に展開する状態とに切換え可能であり、重複状態で、リンク補助部材の他端85a1が支点89a寄りに位置して、可動予備苗載台83uは、リンク部材84aの先端84a1より支点89a寄りに配列される。【選択図】図3
