| 摘要 |
A transfer roller cleaning mechanism 12 is brought into contact with a transfer roller 11 so as to remove a harmful substance contained in a developer remaining on the transfer roller 11 after a transfer step. Upon completion of printing of a predetermined number of pages, a fixation roller 13 is moved apart from the transfer roller 11 and a developed image for cleaning is formed over the entire printing area on a photosensitive body 1. This developed image is made into a film shape, which is transferred onto the transfer roller 11. The film-shaped developed image for cleaning is cleaned by the transfer roller cleaning mechanism 12.
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