PROBLEM TO BE SOLVED: To provide an opening and closing shutter device of a fertilizer dropping port of a fertilizer which is configured to automatically and simultaneously perform control operation of turning on/off a clutch of a PTO (power take-off) shaft and control operation of opening and closing a dropping port of a fertilizer in association with each other.SOLUTION: A detector K for the number of revolutions is installed at a rotating operation portion of a fertilizer. When the detector K for the number of revolutions detects a prescribed number or more of revolutions adapted to the operation of the rotating operation portion, an electric motor M is operated to the side of normal rotation so that a shutter plate s is opened. When a prescribed number or less of revolutions is detected, the electric motor M is controlled with the detector for the number of revolutions so that the electric motor M is operated to the side of reverse rotation in which the shutter plate s is closed.COPYRIGHT: (C)2011,JPO&INPIT【課題】PTO軸のクラッチを入・切する制御操作と、肥料の落下口を開閉作動させる制御操作とを、一方の制御操作を行えば、他方の制御操作が、連動して同時に自動的に行われるようにする。【解決手段】施肥機の回転作動部に、回転数検知器Kを設け、その回転数検知器Kが、回転作動部の作動に適応する所定の回転数以上の回転数を検知したときに、シャッタプレートsを開とするよう電動モータMを正転側に作動させ、所定の回転数以下の回転数を検知したときに、シャッタプレートsを閉とする逆転側に電動モータMを作動さすよう、回転数検知器により電動モータMを制御せしめる。【選択図】図3
