| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent deterioration of electrifying property due to transfer residual developer or toner mixing into the electrifying device in the electrifying device electrifying the object to be electrified by bringing into contact a plurality of magnetic brushes using magnetic particles in common. <P>SOLUTION: The quantity of current flowing through the magnetic particles between a first electrifying sleeve 306 and a second electrifying sleeve 303 is measured and the degree of soiling of the magnetic particles is measured. Exchange of the magnetic particles, etc., is carried out according to the quantity of the current. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
