US 12,393,148 B2
Image forming apparatus that detects attached state to main body of cassette accommodating sheet
Seiji Yokoyama, Shizuoka (JP)
Assigned to CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Apr. 4, 2024, as Appl. No. 18/626,576.
Claims priority of application No. 2023-064390 (JP), filed on Apr. 11, 2023.
Prior Publication US 2024/0345523 A1, Oct. 17, 2024
Int. Cl. G03G 15/00 (2006.01); B65H 1/26 (2006.01)
CPC G03G 15/5062 (2013.01) [B65H 1/266 (2013.01); G03G 15/6502 (2013.01); G03G 15/6558 (2013.01); B65H 2403/72 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a first detection unit configured to detect whether a cassette accommodating a sheet is in an attached state in which the cassette is attached to a main body of the image forming apparatus, or in a non-attached state in which the cassette is not attached to the main body;
a transfer roller configured to transfer an image to the sheet in a transfer region;
a conveyance roller configured to convey, to the transfer region, a first sheet that is fed from the cassette to a conveyance path;
a drive unit configured to transmit a driving force of a motor to the conveyance roller in the attached state, and not to transmit the driving force of the motor to the conveyance roller in the non-attached state; and
a determination unit configured to determine that an image defect has occurred in forming a first image on the first sheet when the first detection unit detects that a state of the cassette has transitioned from the attached state to the non-attached state, in a monitoring period including a period from a first timing at which the first sheet starts to be conveyed by the transfer roller, to a second timing.