PROBLEM TO BE SOLVED: To provide a reaping height controller of a combine harvester which can perform cutting operation even to the cutting operation in the field with a comparatively large unevenness part while preventing the rushing into the ground surface of a grass dividing rod of a reaping part.SOLUTION: The reaping height controller of a combine harvester is characterized as follows. In the combine harvester that includes: a lifter (15) to lift a reaping and conveying part (7) a cutting grounding sensor (SE2) that detects the to-ground height of the reaping and conveying part (7) and a reaping height sensor (SE3) that detects the to-machine height of the reaping and conveying part (7), the reaping height lift control that operates the lifter (15) based on the detected value and the target reaping height set value of the reaping height sensor (SE3) is executed, and when the to-ground height of the reaping and conveying part (7) detected by the cutting grounding sensor (SE2) while executing the reaping height lift control becomes the value over the alienation reference value detected when the grounding part of the cutting grounding sensor (SE2) parts from the ground surface to an upper side, a controller (21) stops the output of the side that lowers the reaping and conveying device (7), and is provided.COPYRIGHT: (C)2013,JPO&INPIT【課題】比較的大きな凹凸部がある圃場での刈取作業でも、刈取部の分草杆の地面への突入を防止しながら刈取作業を行なえるものとする。【解決手段】刈取搬送部(7)を昇降させる昇降手段(15)と、刈取搬送部(7)の対地高さを検出する刈取接地センサ(SE2)と、刈取搬送部(7)の対機体高さを検出する刈高さセンサ(SE3)とを備えたコンバインにおいて、刈高さセンサ(SE3)の検出値と目標刈高さ設定値に基づいて昇降手段(15)を作動させる刈高さ昇降制御を実行し、刈高さ昇降制御の実行中に刈取接地センサ(SE2)によって検出される刈取搬送部(7)の対地高さが、刈取接地センサ(SE2)の接地部が地面より上方に離れた場合に検出される離間基準値以上の値になった場合に、刈取搬送装置(7)を下降させる側の出力を停止するコントローラ(21)を設ける。【選択図】図4
