Fixing device, image forming apparatus and adjustment method of fixing device

An image forming apparatus comprising:

• a toner image forming unit that forms a toner image;
• a transfer unit that transfers, onto a recording medium, the toner image formed by the toner image forming unit;
• and
• a fixing unit that fixes, on the recording medium, the toner image transferred by the transfer unit onto the recording medium,
• the fixing unit including:
• a fixing roll;
• a fixing belt that is laid around the fixing roll;
• a pressure roll that forms a pressing portion through which the recording medium passes, the pressing portion being formed between the pressure roll and the fixing belt;
• and
• a surface shape adjusting roll that has a surface including a plurality of spherical projections, and that adjusts surface shapes of the fixing belt by providing a plurality of spherical recesses using the plurality of spherical projections while rotating with the surface thereof being in contact with the fixing belt.

An adjustment method of a fixing device including:

• a fixing member that is driven to rotate;
• a pressurizing member that is rotated in accordance with rotation of the fixing member while pressing the fixing member, and that forms a pressing portion through which a recording medium passes, the pressing portion being formed between the pressurizing member and the fixing member;
• and a surface shape adjusting member that has a surface including a plurality of spherical projections;
• the adjustment method comprising:
• causing the surface shape adjusting member to rotate with the surface of the surface shape adjusting member being in contact with the fixing member;
• and
• adjusting surface shapes of the fixing member by providing a plurality of recesses on a surface of the fixing member during rotation of the surface shape adjusting member.