PROBLEM TO BE SOLVED: To prevent a pre-reaping treatment device from rushing into a field to be damaged even when a machine body has been greatly shaken back and forth at the time of starting reaping harvesting work.SOLUTION: A reaping lift controller for a combine that includes a pair of left and right traveling devices 10 for supporting an undercarriage 11, a pre-reaping treatment device 13 that is provided on the forepart of the undercarriage 11 and is moved up and down by a reaping lifting cylinder 19, and reaping height detection means 25, 30 for detecting the ground height of the pre-reaping treatment device 13 and keeps the pre-reaping treatment device 13 within a set ground height range by controlling the reaping lifting cylinder 19 on the basis of ground heights detected by the reaping height detection means 25, 30 provides, within a prescribed period or a prescribed travel distance after starting reaping travel, grounding avoiding control of lifting the pre-reaping treatment device 13 at a grounding avoiding height higher than a set ground height when the reaping height detection means 25, 30 have detected a height equal to or lower than the set ground height.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2017,JPO&INPIT【課題】本発明は、刈取収穫作業の開始時に機体が前後に大きく揺れることがあっても刈取前処理装置が圃場に突っ込んで損傷することを防止する。【解決手段】車台11を支持する左右一対の走行装置10を設け、車台11の前部には刈取前処理装置13を刈取昇降シリンダ19で昇降自在に設け、該刈取前処理装置13の地上高を検出する刈取高さ検出手段25,30を設け、該刈取高さ検出手段25,30で検出された地上高に基づいて刈取昇降シリンダ19を制御して刈取前処理装置13を設定地上高範囲に維持するコンバインの刈取昇降制御装置において、刈取走行開始後の一定時間内或いは一定走行距離内では、刈取高さ検出手段25,30が設定地上高以下を検出すると刈取前処理装置13を設定地上高より高い接地回避高さに上昇する接地回避制御を設けた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3
