Image forming apparatus and image forming method
AssigneesKabushiki Kaisha Toshiba, Toshiba Tec Kabushiki Kaisha
InventorMasao Ando
Life of this patent
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Abstract
An image forming apparatus comprises a transfer fixer which secondarily transfers a first toner image on a first intermediate transfer belt onto a first side of a sheet at a first secondary transfer position and fixes the first toner image transferred to the first side of the sheet while secondarily transferring a second toner image on the second intermediate transfer belt onto a second side of the sheet opposite to the first side at a second secondary transfer position and fixing the second toner image transferred to the second side of the sheet.
Claims10
An image forming apparatus, comprising:
- a first image forming unit configured to form a first toner image with a first toner with negative charges;
- a second image forming unit configured to form a second toner image with a second toner with positive charges;
- a first intermediate transfer belt formed into an endless belt and configured to primarily transfer the first toner image from the first image forming unit and move the primarily transferred first toner image to a first secondary transfer position;
- a second intermediate transfer belt formed into an endless belt opposite to the first intermediate transfer belt and configured to primarily transfer the second toner image from the second image forming unit and move the primarily transferred second toner image to a second secondary transfer position opposite to the first secondary transfer position;
- a conveyance unit configured to convey a sheet between the first secondary transfer position and the second secondary transfer position;
- and
- a transfer fixer configured to secondarily transfer the first toner image on the first intermediate transfer belt onto a first side of the sheet at the first secondary transfer position and fix the first toner image transferred to the first side of the sheet while secondarily transferring the second toner image on the second intermediate transfer belt onto a second side of the sheet opposite to the first side at the second secondary transfer position and fixing the second toner image transferred to the second side of the sheet.
An image forming method, comprising:
- forming a first toner image with a first toner with negative charges;
- forming a second toner image with a second toner with positive charges;
- primarily transferring the first toner image onto a first intermediate transfer belt and moving the primarily transferred first toner image to a first secondary transfer position of the first intermediate transfer belt;
- primarily transferring the second toner image onto a second intermediate transfer belt and moving the primarily transferred second toner image to a second secondary transfer position of the second intermediate transfer belt;
- conveying a sheet between the first secondary transfer position and the second secondary transfer position;
- and
- secondarily transferring the first toner image on the first intermediate transfer belt onto a first side of the sheet at the first secondary transfer position and fixing the first toner image transferred to the first side of the sheet while secondarily transferring the second toner image on the second intermediate transfer belt onto a second side of the sheet at the second secondary transfer position and fixing the second toner image transferred to the second side of the sheet.
Dependencies are inferred from the claim text.