PROBLEM TO BE SOLVED: To avoid defects in which grains are dropped while a shutter is not closed as it is and to increase general versatility in automating opening and closing operation of shutter and improving operability.SOLUTION: The grain unloader of combine harvester has a constitution that a drive stop command is outputted to a conveying screw while maintaining an opening position of the shutter by a shutter drive device with input of an operation signal to command a drive stop by an unloading command means for turning on or off the drive of a conveying screw of grain conveying part, and an operation command to a shutter closing position side is outputted to the shutter drive device on the basis of a detection result that a conveying cylinder is reached to a standard storage position by a rotation position detection means.COPYRIGHT: (C)2011,JPO&INPIT【課題】シャッタの開閉操作を自動化して操作性を改善するにあたり、シャッタが閉じられないままで穀粒がこぼれ落ちる不具合を回避でき、かつ汎用性も高める。【解決手段】穀粒搬送部の搬送用スクリューの駆動を入り切りする搬出指令手段による駆動停止を指令する操作信号が入力されるに伴って、シャッタ駆動装置によるシャッタの開放姿勢は維持したままで、搬送用スクリューに対して駆動停止指令を出力し、かつ、旋回位置検出手段による搬送用筒体が基準格納位置に達したことの検出結果に基づいてシャッタ駆動装置に対してシャッタ閉塞姿勢側への作動指令を出力するように構成した。【選択図】図11
