| 摘要 |
<P>PROBLEM TO BE SOLVED: To make the lifetime of developing devices longer by suppressing the deterioration of developers. <P>SOLUTION: The developing devices 2Y, 2M, 2C and 2K provided with the developers containing a plurality of colors of toners are provided with a developer replenishing section 20 to which the replenishing developers are supplied from a developer storage section 24 and a toner replenishing section 23 to which the replenishing toners are supplied from a toner storage section 25, and the developer replenishment from the developer storage section 24 to the developer replenishing section 20 is performed at intervals of a prescribed number of printing sheets. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
