| 摘要 |
PURPOSE:To leave no uncleaned parts on a photosensitive drum in two revolutions one cycle system copying by keeping the drum turned and a cleaning device operated until the uncleaned parts are thoroughly cleaned in spite of the case in which a main switch is turned off. CONSTITUTION:The normally open contacts Ra3-1 of a relay Ra3 in parallel with a main switch 22 and the Ra3 in parallel with Ra2 are provided to a control part 26, and the on-timing of the relay Ra3 is set at said control part 26 prior to the end of operation of a paper discharge switch like a timing chart. Further, programs are inputted into said control part 26 in such a way that the operation time of said relay Ra2 assumes the time interval when a photosensitive drum is started from the position where the leading end of the image after the transfer (the leading end of the residual toner) abuts on a cleaning member 2 and the drum rotates at least one time, whereby the operation time is maintained constant despite turning off of the main switch. |
