| 摘要 |
A developing device is composed of a developing roller to carry developer, feed developer to image carriers and form a developer image; an upper mixer screw to convey developer to the developing roller while stirring it; a lower mixer screw provided under the upper mixer screw to circulate and convey developer jointly with the upper mixer screw; a drawing up roller with a first and second magnetic poles formed to draw up developer when the lower mixer screw feeds developer to the upper mixer screw; and a magnetic matter provided in contact with the drawing up roller so as to form an angle 90 DEG or below to the horizontal line passing through the center of axis of the developing roller between the first and second magnetic poles and separate the developer drawn up by the drawing up roller. <IMAGE> |
