Patent ID: 11905138
Assignee: CANON KABUSHIKI KAISHA
Field: Handling (Mechanical engineering)
Classification: CPC B | IPC B

Claim 9:
10. An image forming apparatus comprising:
a sheet conveyance device comprising:
a pair of first conveyance rollers that nip and convey a sheet;
a pair of second conveyance rollers that are arranged downstream of the first conveyance rollers in a sheet conveyance direction and that nip and convey the sheet;
a pair of registration rollers that are arranged downstream of the second conveyance rollers in the sheet conveyance direction and that nip and convey the sheet after correcting skew of the sheet by abutting a leading end of the sheet to the registration rollers;
a switching portion that switches a state of the second conveyance rollers between a contact state where the second conveyance rollers are in contact and a separated state where the second conveyance rollers are separated; and
a control unit configured to control the first conveyance rollers, the second conveyance rollers, the registration rollers, and the switching portion; and

an image forming unit configured to form an image on the sheet fed from the registration rollers,
wherein the control unit switches a conveyance operation between a first conveyance operation and a second conveyance operation and executes the first conveyance operation or the second conveyance operation,
wherein in the first conveyance operation, the registration rollers start rotating to convey the sheet of which the skew has been corrected by the first conveyance rollers and the registration rollers, the second conveyance rollers are in the separated state, and a sheet conveyance speed by the registration rollers is higher than a sheet conveyance speed by the first conveyance rollers, and
wherein in the second conveyance operation, the registration rollers start rotating to convey the sheet of which the skew has been corrected by the first conveyance rollers and the registration rollers, the second conveyance rollers are in the separated state, and the sheet conveyance speed by the registration rollers is lower than the sheet conveyance speed by the first conveyance rollers.