PROBLEM TO BE SOLVED: To enable the on-off control of a clutch of a reaping and threshing system to be simply and lightly carried out by utilizing a cam mechanism driven by an electrically driven motor, and to enable the cam mechanism to be also utilized for the on-off control of a clutch for unloading grain.SOLUTION: A position (a) at which a clutch 50 for unloading grains is in an on-state and a reaping clutch 30 is in an off-state is set in one side operation region, and a position (c) at which the clutch 50 for unloading grains is in the off-state and the reaping clutch 30 is in the on-state is set in the other side operation region so as to hold a neutral position N at which the reaping clutch 30 and the clutch 50 for unloading grains are both kept in the off-state in a cum mechanism 8 enabling the rotation direction to be switched to the normal rotation direction and the reverse rotation direction by an electrically driven motor 70.COPYRIGHT: (C)2010,JPO&INPIT【課題】電動モータで駆動されるカム機構を利用して、刈取脱穀系のクラッチの入り切り制御を簡単に、かつ軽快に行えるようにするとともに、そのカム機構を穀粒排出用クラッチの入り切り制御にも利用できるようにする。【解決手段】電動モータ70によって正転方向と逆転方向とに回転方向を変更切換可能なカム機構8に、刈取クラッチ30と穀粒排出用クラッチ50とが共に切り位置に維持される中立位置Nを挟んで、一方側の操作域に穀粒排出用クラッチ50がクラッチ入りで刈取クラッチ30がクラッチ切りとなる位置aを設定し、他方側の操作域に穀粒排出用クラッチ50がクラッチ切りで刈取クラッチ30がクラッチ入りとなる位置cを設定してある。【選択図】図17
