US 12,372,905 B2
Image forming apparatus
Satoshi Nishida, Kanagawa (JP); Kohei Okayasu, Shizuoka (JP); and Takao Kume, Kanagawa (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Sep. 22, 2023, as Appl. No. 18/472,412.
Claims priority of application No. 2022-156018 (JP), filed on Sep. 29, 2022.
Prior Publication US 2024/0111231 A1, Apr. 4, 2024
Int. Cl. G03G 15/20 (2006.01)
CPC G03G 15/2053 (2013.01) 19 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a first rotation body;
a heater disposed in an internal space of the first rotation body;
a second rotation body including a rotation shaft, configured to come in contact with an outer peripheral surface of the first rotation body and to form a nip together with the first rotation body; and
a frame body supporting the first rotation body and the second rotation body, wherein
the image forming apparatus is configured to fix an image formed on a recording material passing through the nip,
in a rotational axis direction of the second rotation body that is orthogonal to a conveyance direction of the recording material, the rotation shaft is exposed from a one-end side and an other-end side of the second rotation body,
a length of the rotation shaft exposed on the one-end side is a first length,
a length of the rotation shaft exposed on the other-end side is a second length smaller than the first length, and
SL/SR≥PR/PL is satisfied, where
PR is a length, in the rotational axis direction, of a the one-end side part of the second rotation body with respect to the center of the frame body,
PL is a length, in the rotational axis direction, of a the other-end side part of the second rotation body with respect to the center of the frame body,
SR is a total area of openings disposed in a first region,
SL is a total area of openings disposed in a second region,
the first region is a region corresponding to the one-end side of the frame body with respect to the center of the frame body in the rotational axis direction, and
the second region is a region corresponding to the other-end side of the frame body with respect to the center of the frame body in the rotational axis direction.