Fuser, image forming apparatus, and image forming method

摘要

Certain embodiments provide a fuser including a cylindrical fixing belt, a heating unit configured to heat the fixing belt, a pressurized section, a first nip forming section, a second nip forming section, and a moving mechanism. The pressurized section is arranged in contact with the fixing belt. The first nip forming section is fixed in a position where the first nip forming section presses the fixing belt against the pressurized section. The second nip forming section is configured to be movable between a position where the second nip forming section can press the fixing belt against the pressurized section and a position where the second nip forming section is separated from the fixing belt. The moving mechanism moves the second nip forming section.

主权项

1. A fuser comprising:
a cylindrical fixing belt; a heating unit configured to heat the fixing belt; a pressurized section arranged in contact with the fixing belt; a first nip forming section fixed in a position where the first nip forming section presses the fixing belt against the pressurized section; a second nip forming section movable between a first position in which the second nip forming section presses the fixing belt against the pressurized section and a second position in which the second nip forming section is separated from the fixing belt; a moving mechanism configured to move the second nip forming section between the first position and the second position; and a fuser driver configured to control the moving mechanism based on a temperature of the fixing belt, so that the second nip forming section is moved to the second position when the temperature of the fixing belt is lower than a predetermined temperature and the second nip forming section is at the first position, and the second nip forming section is moved to the first position after the temperature of the fixing belt is equal to or exceeds the predetermined temperature and the second nip forming section is at the second position.