Electrostatographic developing device with toner dosage reservoir

摘要

An electrostatographic developing device (15) comprising a magnet roller (16), a chamber (41) for two-component developer, a holder (22) for toner and a toner dosage reservoir (45) with an opening closed by a magnetic plug (58) of developer, and a magnet (53) for controlling such magnetic plug. Four of these developing devices are mounted on a carousel.