US 12,204,264 B2
Image forming apparatus with recording material conveyance control
Atsushi Iwasaki, Shizuoka (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by Canon Kabushiki Kaisha, Tokyo (JP)
Filed on Jun. 2, 2023, as Appl. No. 18/327,997.
Claims priority of application No. 2022-091702 (JP), filed on Jun. 6, 2022.
Prior Publication US 2023/0393508 A1, Dec. 7, 2023
Int. Cl. G03G 15/20 (2006.01); G03G 15/00 (2006.01)
CPC G03G 15/2064 (2013.01) [G03G 15/2039 (2013.01); G03G 15/5045 (2013.01); G03G 15/6564 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
an image forming portion that forms a toner image on a recording material;
a fixing portion that includes a heating member, a heating rotating member that is heated by the heating member, and a pressure rotating member that comes into contact with an outer surface of the heating rotating member to form a nip between the heating rotating member and the pressure rotating member, the fixing portion fixing the toner image, which has been formed on the recording material nipped and conveyed by the nip, onto the recording material by heating using heat of the heating member;
a first temperature detecting portion that detects a temperature at a center of the heating member in a longitudinal direction of the heating member perpendicular to a conveyance direction of the recording material;
a second temperature detecting portion that detects a temperature at an end portion of the heating member in the longitudinal direction;
a heating control portion that controls the heating of the heating rotating member performed by the heating member, based on a first detection temperature detected by the first temperature detecting portion; and
a conveyance control portion that controls the conveyance of the recording material,
wherein, in a case where the image forming apparatus continuously forms a toner image on a plurality of recording materials and fixes the toner image onto the recording materials, the conveyance control portion can change throughput that is a number of recording materials to be conveyed per unit time by controlling conveyance of the recording materials, and
wherein the throughput:
(i) is changed from first throughput to second throughput, which is slower than the first throughput, in a case where a second detection temperature detected by the second temperature detecting portion exceeds a first threshold, and
(ii) is changed from the second throughput to third throughput, which is slower than the second throughput, in a case where the second detection temperature exceeds a second threshold, which is higher than the first threshold, after the recording material conveyed at the second throughput reaches the nip.