Provided is an operation method for a strainer. With regard to a strainer that uses the centrifugal force generated by the rotation of a bottomed cylindrical vessel that has filtering through-holes in a peripheral side surface, the method is capable of optimally maintaining straining action and of resolving the problem of the clogging of the filtration through-holes while still optimally maintaining the pressure and duration of the pressing force applied to a foodstuff. Also provided is an automatic strainer device. The present invention has: a vertical bottomed cylindrical vessel that is supported so as to be rotatable around a central axis and that has filtering through holes opened in a peripheral side plate rotating pressing elements that are on the inside of the bottomed cylindrical vessel and that are supported so as to be rotatable around the central axis while contacting or approaching the inner peripheral surface of the peripheral side plate and a filtered object collecting member that collects filtered objects that are expelled out of the bottomed cylindrical vessel from the through holes of the vessel. The present invention includes a step for rotating the bottomed cylindrical vessel, into which objects to be filtered are fed, in a prescribed rotation direction at a first rotation speed and for simultaneously rotating the rotating pressing elements in the same rotation direction as the bottomed cylindrical vessel at a second rotation speed that has a prescribed speed difference from the first rotation speed.提供一種過濾機之運轉方法及自動過濾裝置,適用於利用在周側面鑽設有過濾用透孔的有底圓筒狀容器旋轉所產的離心力以進行食材過濾作業的過濾機,不僅可維持最適當的食材推壓力及持續(作用)時間,同時可消除過濾用透孔造成堵塞,而可維持最佳的過濾作用。為實現上述作用,本發明之運轉方法適用於具有:一可旋轉的支持於一中心軸周圍,且周側板鑽設有許多過濾用透孔之緃型有底圓筒狀容器;設於該有底圓筒狀容器內側而可一邊抵接或近接該周側板內周面,一邊可旋轉地支持持於上述中心軸的周圍之旋轉推壓件;及一用以捕集自上述有底圓筒狀容器的過濾用透孔排出容器外之過濾物的過濾物捕集構件所構成的過濾機;其特徵在於該運轉方法包括:能以第一旋轉速度將內已投入過濾對象物的上述有底圓筒狀容器一邊驅動向所定旋轉方向旋轉,一邊以與上述第一旋轉速度之間保有所定速度差的第二旋轉速度將上述旋轉推壓件驅動向與上述有底圓筒狀容器同一方向旋轉之步驟。4‧‧‧下側軸6、7‧‧‧定時皮帶8‧‧‧伺服馬達(M2)9‧‧‧上側軸(投入管)10‧‧‧從動被帶11‧‧‧定時皮帶12
