PROBLEM TO BE SOLVED: To perform a lifting motion control of a seedling planting device by a lifting cylinder in a simple constitution.SOLUTION: A rice transplanter 1 comprises: a seedling planting device 23 which is mounted on a traveling machine body 2 vertically movably a lifting cylinder 39 which lifts up/down the seedling planting device 23 a lifting selector valve 99 which controls the lifting motion of the seedling planting device 23 by the lifting cylinder 39 and a planting clutch 77 by which power transmission is engaged and disengaged with the seedling planting device 23. The lifting selector valve 99 can be switched between a supply position 99a where hydraulic oil is supplied to the lifting cylinder 39 and a discharge position 99b where the hydraulic oil is discharged from the lifting cylinder 39. An electromagnetic on-off valve 101 is arranged in an oil passage 100 from the lifting selector valve 99 to the lifting cylinder 39. Lifting stop of the seedling planting device 23 is controlled by the electromagnetic on-off valve 101. A switching mechanism 110 selectively switching between switching operation of the lifting selector valve 99 and on-off operation of the planting clutch 77 is provided.COPYRIGHT: (C)2015,JPO&INPIT【課題】昇降シリンダによる苗植付装置の昇降動制御を簡単な構成で行えるようにする。【解決手段】本願発明の田植機1は、走行機体2に昇降動可能に装着した苗植付装置23と、苗植付装置23を昇降動させる昇降シリンダ39と、昇降シリンダ39による苗植付装置23の昇降動を制御する昇降切換弁99と、苗植付装置23への動力伝達を継断する植付クラッチ77とを備える。昇降切換弁99は、昇降シリンダ39に作動油を供給する供給位置99aと、昇降シリンダ39から作動油を排出する排出位置99bとの二位置に切換可能に構成する。昇降切換弁99から昇降シリンダ39に至る油路100中に電磁開閉弁101を設ける。苗植付装置23の昇降停止を電磁開閉弁101で制御する。昇降切換弁99の切換作動と植付クラッチ77の入り切り作動とを選択的に切り換える切換機構110を備える。【選択図】図9
