Patent ID: 8688024

Claim:
A cleaning device comprising: a magnetic brush roller rubbing a surface of a photosensitive drum by a magnetic brush formed of a toner and carriers; a cleaning blade removing the toner remaining on the photosensitive drum; and a toner concentration initialization control part, in order that a toner-to-carrier ratio T/C of the magnetic brush formed on the magnetic brush roller falls within a predetermined range, controlling a bias applied to the magnetic brush roller and an amount of the toner supplied from a developing part to the photosensitive drum, wherein the toner concentration initialization control part: applies a consumption bias to the magnetic brush roller to move to the photosensitive drum all the toner in the magnetic brush; and removes all the toner from the photosensitive drum by the cleaning blade, and then obtains an amount of toner with which the toner-to-carrier ratio T/C of the magnetic brush falls within the predetermined range, supplies the obtained amount of toner from the developing part to the photosensitive drum, and applies a supply bias to the magnetic brush roller to supply, to the magnetic brush roller, the toner supplied to the photosensitive drum.