| 摘要 |
PURPOSE:To minimize the amount of toner to be charged by constituting a process unit mounted detachably on a support structure so that its life comes to the end substantially when a prescribed amount of charged fresh toner and toner which is used once, removed from conveyed into a toner storage chamber through the operation of a toner conveying means are consumed. CONSTITUTION:The process unit 16 has a unit frame, whose supported rail parts 24 and 26 are engaged with the support rails of an upper support frame body 6 to slide the unit frame 22 at right angles to the paper surface, so that the process unit 16 is mounted on and demounted from the upper support frame body 16. In this case, the process unit 16 comes to the end of its life substantially when a prescribed amount of charged fresh toner and toner which is removed from the surface of the photosensitive body and conveyed into the toner storage chamber through the operation of the toner conveying means are consumed. |
