US 12,346,044 B2
Image forming apparatus with improved uniformity of heat at the nip of its fixing device
Ryo Suzuki, Chiba (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Nov. 2, 2023, as Appl. No. 18/500,950.
Claims priority of application No. 2022-205017 (JP), filed on Dec. 22, 2022.
Prior Publication US 2024/0210862 A1, Jun. 27, 2024
Int. Cl. G03G 15/20 (2006.01); G03G 15/00 (2006.01)
CPC G03G 15/2046 (2013.01) [G03G 15/2042 (2013.01); G03G 15/657 (2013.01); G03G 2215/00413 (2013.01); G03G 2215/00599 (2013.01); G03G 2215/00945 (2013.01); G03G 2215/2045 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
an image forming portion configured to form a toner image on a recording material;
a fixing portion including a first rotatable member configured to apply heat to the recording material, a heating portion configured to heat the first rotatable member, and a second rotatable member configured to form a fixing nip portion for fixing the toner image on the recording material by nipping and conveying the recording material in contact with the first rotatable member; and
a control portion being capable of changing a time from when a trailing end of a predetermined recording material has passed through the fixing nip portion until when a subsequent recording material following the predetermined recording material reaches the fixing nip portion,
wherein the control portion is configured to execute a job in which image formation is performed on a first recording material and a second recording material, the second recording material being conveyed after the first recording material and having a size in a widthwise direction crossing to a conveyance direction larger than that of the first recording material,
wherein when a width of the toner image to be formed on the recording material with respect to the widthwise direction is defined as an image area width, the control portion controls so that the time in a case in which the width of the first recording material is equal to or longer than the image area width of the second recording material is shorter than the time in a case in which the width of the first recording material is shorter than the image area width of the second recording material.