Patent ID: 9164432
Filing Date: 2015-10-20
Classification: G03G

Abstract:
1. A developing device comprising: a magnetic roller whose roller surface holds toner and magnetic carrier, the toner being adhered to the magnetic carrier; a developing roller arranged to face the magnetic roller; a cover covering the developing roller and arranged at a predetermined distance from a roller surface of the developing roller; a first magnetic force generator provided inside the magnetic roller in a state where a magnetic pole face of the first magnetic force generator faces the developing roller; a second magnetic force generator provided inside the developing roller so as to be able to move between a first position and a second position, a magnetic pole face of the second magnetic force generator facing the magnetic roller at the first position and facing the cover at the second position, the first magnetic force generator and the second magnetic force generator having different polarities; and a movement controller causing the second magnetic force generator to move from the first position to the second position, and subsequently to move to the first position, wherein the second magnetic force generator moves between the first position and the second position in a state where the magnetic carrier is adsorbed on the roller surface of the developing roller by a magnetic force, and when the magnetic carrier adsorbed on the roller surface passes through a gap with the predetermined distance between the cover and the roller surface, the magnetic carrier collects uncollected toner that has adhered to the cover.