US 12,292,708 B2
Fixing device and image forming apparatus
Kiyoharu Kakomura, Chiba (JP); and Takuya Machida, Chiba (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on May 8, 2023, as Appl. No. 18/313,606.
Claims priority of application No. 2022-086485 (JP), filed on May 27, 2022.
Prior Publication US 2023/0384723 A1, Nov. 30, 2023
Int. Cl. G03G 15/20 (2006.01); G03G 15/00 (2006.01)
CPC G03G 15/5029 (2013.01) [G03G 15/2039 (2013.01); G03G 15/6541 (2013.01); G03G 2215/00481 (2013.01); G03G 2215/00742 (2013.01); G03G 2215/00822 (2013.01)] 4 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a heating rotary member configured to heat a recording material;
a pressing rotary member configured to press the heating rotary member, and to form a nip portion with the heating rotary member, and to fix a toner image on the recording material with the heating rotary member;
an acquisition unit configured to acquire grammage information about the recording material; and
a temperature control unit configured to control a temperature of the heating rotary member based on the grammage information,
wherein the temperature control unit controls the temperature of the heating rotary member based on the grammage information corresponding to a predetermined number of sheets of recording materials, when the acquisition unit completes the acquisition of grammage information the grammage information corresponding to the predetermined number of sheets of recording materials within a predetermined time period after a printing start signal for a job to form the images on the predetermined number of sheets of recording materials is input, and
wherein the temperature control unit controls the temperature of the heating rotary member based on the grammage information corresponding to a smaller number of sheets of recording materials than the predetermined number of sheets of recording materials without waiting for completion of the acquisition of the grammage information corresponding to the predetermined number of sheets of recording materials, when the acquisition unit has not completed the acquisition of the grammage information corresponding to the predetermined number of sheets of recording materials within the predetermined time period after the printing start signal is input.