PROBLEM TO BE SOLVED: To eliminate, in manually threshing operation in a combine harvester, grain harvest loss due to a temporary variation of a threshed product by temporarily halting automatic control of winnowing in the threshing machine.SOLUTION: The combine harvester is provided with in a sorting air-blowing pathway from a winnower (37) to a swing sorting shelf (37), an air-blowing direction-variable means (9) that switches between a mode where sorting air-blowing levels to be blown rearward of a swing sorting shelf (1) are less than those to be blown forward thereof and another mode where sorting air-blowing levels to be blown rearward of a swing sorting shelf (1) are greater than those to be blown forward thereof. When the travel-halted state of the machine body is detected by a travel-halting detective means (D) and the driving state of the threshing machine (15) is detected by a threshing clutch sensor (52), the air-blowing direction-variable means (9) is automatically switched to a mode that the sorting air-blowing levels to be blown forward of the swing sorting shelf (1) are greater than those to be blown rearward of the swing sorting shelf (1).COPYRIGHT: (C)2012,JPO&INPIT【課題】コンバインでの手扱ぎ作業時に、脱穀装置に設ける風割の自動制御を一時的に停止して、一時的な脱穀処理物の増減による穀粒の収穫ロスを無くする。【解決手段】唐箕(37)から揺動選別棚(37)に至る選別風送風経路内に、揺動選別棚(1)の後部に送風される選別風量よりも揺動選別棚(1)の前部に送風される選別風量の方が多い状態と、揺動選別棚(1)の前部に送風される選別風量よりも揺動選別棚(1)の後部に送風される選別風量の方が多い状態とに切換える送風方向変更手段(9)を設け、走行停止検出手段(D)が機体の走行停止状態を検出し、且つ、脱穀クラッチセンサ(52)が脱穀装置(15)の駆動状態を検出した場合に、送風方向変更手段(9)を揺動選別棚(1)の後部に送風される選別風量よりも揺動選別棚(1)の前部に送風される選別風量の方が多い状態に自動的に切換える。【選択図】図4
