Improve the efficiency that operation and cleaning work are discharged by the grain of combined harvester progress. If by grain toward lower section conveying cylinder (35) submitting carrying device (29),What is equipped with switching valve (68) toward the air-supply path of conveying cylinder (35) side from air supply device (37) and switches over to be directed to the 1st interior state of conveying cylinder (35) in the wind that will come from air supply device (37) and be directed to the wind from air supply device (37) toward between the 2nd state of ejiction opening (70) side of air-supply path external openingIf make to detect when switching valve (68) is switched to 2 state to air supply device (37) carry out start-up function make the air supply device (37) start and make carrying device (29) halted state maintenance control device (92).提高由聯合收穫機進行之穀粒排出作業及清掃作業之效率。；設將穀粒往下方之搬送筒(35)送出之送出裝置(29)，於從送風裝置(37)往搬送筒(35)側之送風路徑設有切換閥(68)用以在將來自送風裝置(37)之風導引至搬送筒(35)內之第1狀態與將來自送風裝置(37)之風導引至往送風路徑外部開口之噴出口(70)側之第2狀態間進行切換，設使檢測出切換閥(68)被切換為第2狀態時對送風裝置(37)進行起動操作使該送風裝置(37)起動並使送出裝置(29)之停止狀態維持之控制裝置(92)。
