PROBLEM TO BE SOLVED: To provide a reaping rise control device for a combine-harvester to raise and fall a reaping part of the combine harvester by detecting the ground height of a reaping part by a ground sensor disposed at the reaping part of the combine-harvester, wherein the reaping part is prevented from excessively falling to plunge the grass-dividing lever of the reaping part into a farm field in the case where the combine harvester runs for reaping across the recess or groove of the farm field.SOLUTION: In a reaping rise and drop control device for a combine-harvester, a reaping ground sensor SE2 disposed on grass-dividing lever 10 of a reaping transfer part 7 contacts the ground to detect the ground height of the reaping transfer part 7, and lifting means 15 of the reaping transfer part is controlled to keep the reaping transfer part 7 at a target ground height. The reaping transfer part 7 is equipped with a grain calm sensor SE9. In the case where it is detected while the grain calm sensor SE9 is detecting the grain calm that a grounding part SE2a of the reaping ground sensor SE2 leaves the ground surface continuously for a predetermined time period, the descent output of the lifting means 15 is stopped.COPYRIGHT: (C)2015,JPO&INPIT【課題】本発明は、コンバインの刈取部に設ける接地センサで刈取部の対地高さを検出して刈取部を自動制御で昇降するコンバインの刈高さ制御装置において、圃場の凹部や溝を跨いで刈取走行する場合に、刈取部が下がり過ぎて刈取部の分草杆を圃場に突っ込むことを防止する。【解決手段】刈取搬送部7の分草杆10に設けた刈取接地センサSE2が地面に接触することで刈取搬送部7対地高さを検出し、刈取搬送部7の昇降手段15を制御して刈取搬送部7を目標対地高さに維持するコンバインの刈取昇降制御装置において、刈取搬送部7に穀稈センサSE9を設け、穀稈センサSE9が穀稈を検出している間に刈取接地センサSE2の接地部SE2aが地面から離れた状態を所定時間継続して検出した場合は昇降手段15の下降出力を停止することを特徴とするコンバインの刈取昇降制御装置とする。【選択図】図4
