| 摘要 |
An image forming apparatus for forming an unfixed toner image on a sheet includes a fixing unit including a fixing roller, a back-up member for cooperating with the fixing roller to form a nip therebetween, and a rotatable heating member contactable to a surface of the fixing roller to heat the fixing roller; wherein the sheet is outputted from the apparatus after the unfixed toner image is fixed on the sheet, wherein the apparatus is operable in a cleaning mode for cleaning the fixing unit, wherein when the cleaning mode is selected, a predetermined unfixed toner image is formed on the sheet, and the sheet is fed to the fixing unit, and the toner is transferred from the sheet onto the fixing roller in the fixing nip, and then the toner transferred onto the fixing roller is brought into contact to the heating member, and thereafter, the toner on the fixing roller is transferred onto the sheet in the fixing nip.
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