Image formation apparatus, image formation unit and toner stirring unit

摘要

This invention relates to a device for detecting when the magnetic toner in the developing unit of an image formation device is empty, and prevents erroneous detection of empty toner even when the fluidity of the magnetic toner becomes poor. The developing device (3) comprises a stirring unit (30) having a cleaning member (22) for cleaning the position of a toner sensor (10), a toner accumulation section (24), and a magnetic metal member (21). The magnetic metal member (21) and toner accumulation section (24) for preventing erroneous detection of the toner-empty alarm are located at the sensor position of the stirring unit, so it is possible for the toner sensor to synthetically generate output that toner is detected, and thus making it possible to prevent erroneous detection that the toner is empty.