PURPOSE:To surely detect treating material by installing a sensor detecting existence or flowing quantity of threshing material thrown into scrubbing chamber in specific pathway. CONSTITUTION:A sensing part 22a of a sensor 22 is installed in a guiding pathway of treating material by a dust-feeding valve 24 provided at the nearest side to inlet of a scrubbing chamber. The treating material for threshing thrown into the scrubbing chamber is fed along the dust-feeding valve guiding the treating material for threshing conveyed by scrubbing gear 6a in conveying to backward by a scrubbing body 6, then the treating material is surely detected by the sensing part of the sensor, thus controlling of air flow in a winnowing machine thereafter, etc., is able to be accurately performed.
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