Patent ID: 8867980
Filing Date: 2014-10-21
Classification: G03G

Abstract:
1. An image forming apparatus comprising: an image forming portion which includes a transfer portion to transfer a toner image to a sheet and a fixing portion to fix the toner image on the sheet; a sheet re-conveying portion which re-conveys the sheet having an image formed at the image forming portion to the image forming portion; a sheet processing portion which processes the sheet having the image formed by the image forming portion; wherein the sheet processing portion can accept and convey sheets at a first plurality of sheet conveying positions, where the first plurality of sheet conveying positions each have a sheet side edge located in a first range; a shift portion which is arranged upstream of the image forming portion in a sheet conveying direction and shifts the sheet in a width direction being perpendicular to the sheet conveying direction; wherein the shift portion can shift the sheet to a second plurality of sheet conveying positions each having the sheet side edge located in the first range or a second range, wherein the second range is outside of the first range; and a control portion which selectively sets a sheet conveying position of each sheet in the width direction of the sheet passing through the fixing portion for each sheet and controls the shift portion to shift the sheet based on whether a duplex mode, where the sheet re-conveying portion re-conveys the sheet, is set or a single mode, where the sheet is not re-conveyed, is set; wherein when the duplex mode is set, the control portion selects the sheet conveying position of the sheet, when forming the image on a front surface of the sheet, so that the side edge of the sheet passes through the fixing portion through either the first range or the second range, and the control portion selects the sheet conveying position of the sheet, when forming the image on a back surface of the sheet, so that the side edge of the sheet passes through the fixing portion through the first range.