Image forming apparatus

An image forming apparatus for forming an image on a sheet, the image forming apparatus comprising:

• an image forming unit configured to form the image on the sheet;
• a double-sided conveyance path through which the sheet with the image formed on a first surface passes toward the image forming unit to form an image on a second surface of the sheet opposite to the first surface;
• a guide member having a contact portion configured to contact one end of the sheet in a width direction of the sheet, wherein the guide member is provided on the double-sided conveyance path;
• a first roller unit forwardly and reversely rotatable, wherein the first roller unit includes a drive shaft, and a first roller and a second roller coaxially disposed on, and rotatable with, the drive shaft;
• a second roller unit configured to form a first nip portion in cooperation with the first roller unit;
• and
• a third roller unit configured to form a second nip portion in cooperation with the first roller unit,
• wherein, while the first roller unit is forwardly rotating, the sheet is conveyed toward an outside of the image forming apparatus at the first nip portion and conveyed toward the double-sided conveyance path at the second nip portion,
• wherein the second roller is disposed at a position farther away from the contact portion than the first roller in an axial direction of the drive shaft, and
• wherein the second roller has an outer diameter that is larger than an outer diameter of the first roller.