US 11,815,835 B2
Image forming apparatus
Takashi Narahara, Shizuoka (JP); Ryo Morihara, Telok Blangah (SG); and Yutaka Sato, Tokyo (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Sep. 27, 2022, as Appl. No. 17/953,639.
Claims priority of application No. 2021-159537 (JP), filed on Sep. 29, 2021.
Prior Publication US 2023/0102072 A1, Mar. 30, 2023
Int. Cl. G03G 15/20 (2006.01)
CPC G03G 15/2039 (2013.01) [G03G 2215/00599 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a fixing unit configured to heat a recording material on which a toner image based on image data is formed and which is transported at a fixing nip portion to fix the toner image to the recording material; and
a control unit configured to determine a target temperature when the fixing unit heats the toner image for each recording material based on the image data, and control switching timing of the target temperature, wherein
in a case where the target temperature of a first recording material is a first temperature, the target temperature of a second recording material which is fixed subsequently to the first recording material is a second temperature higher than the first temperature, and, a difference between the second temperature and the first temperature has a first value, the control unit starts switching to the second temperature from timing which is earlier than reaching of the second recording material to the fixing nip portion by a first period,
in a case where the target temperature of a third recording material is a third temperature higher than the first temperature, the target temperature of a fourth recording material which is fixed subsequently to the third recording material is a fourth temperature higher than the third temperature, and, a difference between the fourth temperature and the third temperature has the first value, the control unit starts switching to the fourth temperature from timing which is earlier than reaching of the fourth recording material to the fixing nip portion by a second period, and
the second period is shorter than the first period.