PROBLEM TO BE SOLVED: To provide a combine harvester which can eliminate requiring a start-up period from a vehicle speed at which initial automatic control is released to a standard setting vehicle speed for automatic loss control, for example, in a travel part, when an operator performs automatic loss control operation again after the automatic loss control is released due to a change in a field environment or the like during the automatic loss control operation.SOLUTION: A dust-send valve, a chaff sieve and a travel part are connected to a controller to constitute a control operation mechanism part. The control operation mechanism part is configured so as to start operation by operation of an automatic loss control operation part, and a loss control reset operation part is provided independently in addition to the automatic loss control operation part. The loss control reset operation part, while maintaining the detecting state of automatic loss control, releases operation correction only.SELECTED DRAWING: Figure 3【課題】ロス自動制御作業時に圃場環境等の変化で一旦ロス自動制御を解除しその後作業者が再度ロス自動制御操作を行うと、たとえば走行部においては当初の自動制御の解除された車速からロス自動制御の標準設定車速にまで立ち上る時間を要する欠点がある。【解決手段】 前記送塵弁及びチャフシーブ並びに走行部は制御装置に接続して制御作動機構部を構成し、しかも、制御作動機構部は自動ロス制御操作部の操作により作動開始するように構成すると共に、自動ロス制御操作部とは別個にロス制御リセット操作部を設け、ロス制御リセット操作部によりロス自動制御の検出状態を維持したままで作動補正のみを解除することを特徴とする。【選択図】図３
