PROBLEM TO BE SOLVED: To provide a rice transplanter that achieves planting work matched to the state of a paddy surface and the traveling state of the rice transplanter, by detecting a sinkage amount of a float and using the control of a height of a planting part (elevation control).SOLUTION: The rice transplanter includes in the planting part the float the height of which can be changed through a link and which is supported turnably in the pitting direction, the rice transplanter controls the height of the planting part so that the turning angle of the float becomes a predetermined target angle. The rice transplanter also includes a surface detection sensor turnably supported in the pitting direction and detecting the surface position of a paddy surface, and measures a sinkage amount of the float based on the turning angle of the surface detection sensor and corrects the target angle of the float so that the sinkage amount of the float becomes constant.COPYRIGHT: (C)2015,JPO&INPIT【課題】フロートの沈下量を検出して植付部高さの制御(昇降制御)に用いることで、田面の状況及び田植機の走行状況に応じた植付作業を実現する田植機を提供する。【解決手段】植付部に、リンクを介して高さ変更可能、かつ、ピッチング方向に回動可能に支持されるフロートを備え、前記フロートの回動角が所定の目標角になるように、植付部高さを制御する田植機であって、ピッチング方向に回動自在に支持されるとともに、田面の表面位置を検出する表面検出センサを備え、前記表面検出センサの回動角に基づいて、前記フロートの沈下量を測定し、前記フロートの沈下量が一定となるように、前記フロートの目標角を補正する。【選択図】図5
