Patent ID: 8285161
Filing Date: 2012-10-09
Classification: G03G

Abstract:
1. An image forming apparatus operable in a plurality of operation modes including a monochrome printing mode and a color printing mode, the image forming apparatus comprising: a first photoconductor drum for use at least in the monochrome printing mode; a plurality of second photoconductor drums for use in the color printing mode; a plurality of development rollers disposed in positions corresponding to the first and second photoconductor drums, each of the development rollers being configured to be in contact with and supply a corresponding photoconductor drum with developer and operative to collect developer remaining on the corresponding photoconductor drum in contact therewith during an operation thereof; a separation mechanism configured to cause development rollers corresponding to the second photoconductor drums to move away from the corresponding second photoconductor drums and to come back to positions in which the development rollers are in contact with the corresponding second photoconductor drums; a plurality of transfer members disposed in positions corresponding to the first and second photoconductor drums to transfer the developer from surfaces of the photoconductor drums to a medium being transported, wherein the second photoconductor drums are located downstream of the first photoconductor drum in a direction of transport of the medium; and a controller comprising: