PROBLEM TO BE SOLVED: To provide a selection control device of a thresher, capable of suppressing third crop loss occurrence to minimum, and in a state of maintaining high selection accuracy, preventing damage of grains(paddies) when an amount of processed products on an oscillation selection body 51 becomes less, and removing a selection load earlier, and collecting grains from a thresher 4 into a grain tank 6 without leaving the grains, in selection control of the thresher 4.SOLUTION: A selection control device changes automatically a fin aperture of a chaff sieve 55 based on a processed product amount on an oscillation selection body 51 detected by processed product amount detection means 80, 81, and when the amount of the processed products on the oscillation selection body 51 becomes equal to or lower than a prescribed amount, and a fin 55a becomes in a prescribed closed state, controls so that the fin 55a becomes in a prescribed open state.SELECTED DRAWING: Figure 12COPYRIGHT: (C)2017,JPO&INPIT【課題】脱穀装置4の選別制御を行うにあたり、3番ロスを多量に発生させないことは基より、選別精度を高く維持した状態で、揺動選別体51上の処理物が少なくなった際の穀粒(籾)の損傷を防止し、また、選別負荷を早期に取り除いて脱穀装置4内から穀粒を残さずグレンタンク6等に回収することができる、脱穀装置の選別制御装置を提供する。【解決手段】選別制御装置は、処理物量検出手段80、81が検出した揺動選別体51上の処理物量に基づいて、チャフシーブ55のフィン開度を自動的に変更すると共に、揺動選別体51上の処理物が所定量以下になり、フィン55aが所定の閉じ状態となると、フィン55aを所定の開き状態にするように制御する。【選択図】図12
