PROBLEM TO BE SOLVED: To provide a reaping portion elevating controller of a reaping harvester, which can avoid the contact of the reaping portion with the ground, even if the reaping portion reaps and travels, while inclined to a horizontal reference level.SOLUTION: In the reaping portion elevating controller of the reaping harvester, control means H for performing a reaping portion elevating control for controlling an elevation operating means C1 that the ground height of the reaping portion is positioned at a target ground height and also a posture control for controlling the operation of a posture change operation means so that the inclination angle of the reaping portion to a horizontal standard level is maintained at a target inclination angle, performs, as reaping portion elevation control, a target height-correcting treatment for determining a corrected target ground height as a target ground height for a ground height detection means A placed lower, when the target inclination angle set by a target inclination angle-setting means 50 is deviated from a reaping portion set range corresponding to a horizontal posture or a posture near to the same and when the reaping portion is estimated to be placed at the target inclination angle. The corrected target ground height is obtained by correcting a target ground height set with a target ground height setting means 54 to a higher side that the set height.COPYRIGHT: (C)2009,JPO&INPIT【課題】 刈取部が水平基準面に対して傾斜しながら刈取走行する場合であっても、刈取部が地面に接触することを回避することが可能となる刈取収穫機の刈取昇降制御装置を提供する。【解決手段】 刈取部の対地高さが目標対地高さになるように昇降操作手段C1を制御する刈取昇降制御、並びに、刈取部の水平基準面に対する傾斜角が目標傾斜角に維持されるように姿勢変更操作手段の作動を制御する姿勢制御を実行する制御手段Hが、刈取昇降制御として、目標傾斜角設定手段50にて設定された目標傾斜角が、刈取部が水平姿勢又はそれに近い姿勢に対応する設定範囲を外れている場合には、刈取部が目標傾斜角になったと仮定したときに、下位側に位置する対地高さ検出手段Aについての目標対地高さとして、目標対地高さ設定手段54にて設定された目標対地高さを設定量高い側に補正した補正目標対地高さを定める目標高さ補正処理を実行する。【選択図】 図5
