Patent attributes
A toner image is transferred from a photo-receptor onto an intermediate transfer unit. A back up roller faces the intermediate transfer unit and is operable to transfer the toner image onto a sheet, thereby image formation is performed. A switch back unit is operable to turn the sheet inside out to perform the image formation onto a reverse face of the sheet after the image formation is performed onto an obverse face of the sheet. A fixing unit is operable to fix the toner image on at lease one of the obverse and reverse faces of the sheet. A switching unit is operable to transport the sheet toward the fixing unit or the switch back unit after the image formation is performed onto the obverse face of the sheet. In a case where the image formation is performed onto the obverse and reverse faces of the sheet, after the image formation is performed onto the obverse face of the sheet, the sheet is transported to the switch back unit, and after the image formation is performed onto the obverse and reverse faces of the sheet, the fixing unit fixes the toner image on the obverse and reverse faces of the sheet.
