US 12,189,317 B2
Fixing device
Takafumi Suzuki, Shizuoka (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Sep. 30, 2022, as Appl. No. 17/937,331.
Claims priority of application No. 2021-163199 (JP), filed on Oct. 4, 2021.
Prior Publication US 2023/0108172 A1, Apr. 6, 2023
Int. Cl. G03G 15/20 (2006.01)
CPC G03G 15/2053 (2013.01) [G03G 15/2017 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A fixing device for fixing a toner image formed on a recording medium to the recording medium, the fixing device comprising:
a film unit configured to rotate and to generate heat to fix the toner image to the recording medium;
a roller configured to rotate and to form a fixing nip portion with the film unit to pinch and convey the recording medium;
a shaft portion attached to the roller;
a pressure roller gear fitted to the shaft portion;
an idler gear disposed to mesh with the pressure roller gear as a driving force transmission unit; and
a first side frame including a first plate configured to hold one end portion of at least one of the film unit or the roller in a longitudinal direction of the fixing device,
wherein the first side frame further includes a second plate attached to the first plate in a way that forms a heat insulating structure that prevents heat from the fixing nip portion from transferring to the pressure roller gear and the idler gear.