Image forming apparatus

An image forming apparatus comprising:

• a transferer provided to transfer a toner image, that is on an image carrier, onto a sheet, the transferer facing the image carrier;
• a fixer provided to fix the toner image on the sheet;
• and
• a controller provided to apply a transfer voltage for transferring the toner image onto the sheet, wherein:
• the transferer is provided to define a transfer nip between the image carrier and the transferer for passing the sheet,
• the fixer includes a heating portion and a pressing portion, and is provided to pass the sheet that has passed through the transfer nip through a fixing nip between the heating portion and the pressing portion, and
• the controller is provided to:
• control the transfer voltage in such a way that a setting value of transfer current flowing through the transfer nip is made constant at a normal value,
• increase the setting value of transfer current beyond the normal value after a leading end of the sheet enters the transfer nip and immediately before the leading end of the sheet enters the fixing nip,
• enter the leading end of the sheet into the fixing nip with increasing the setting value of transfer current beyond the normal value,
• maintain the setting value of transfer current increased beyond the normal value until the leading end of the sheet exits the fixing nip, and
• decrease the setting value of transfer current to the normal value after the leading end of the sheet exits the fixing nip and before a trailing end of the sheet exits the transfer nip.