Patent ID: 11906914
Assignee: BROTHER KOGYO KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 16:
17. An image forming device comprising:
a first photosensitive member;
a first developing roller configured to supply developer to the first photosensitive member;
a second photosensitive member disposed downstream of the first photosensitive member in a conveyance direction of a sheet;
a second developing roller configured to supply developer to the second photosensitive member;
a switch mechanism configured to: switch a state of the first developing roller between a first contact state in which the first developing roller is in contact with the first photosensitive member and a first separated state in which the first developing roller is separated from the first photosensitive member; and switch a state of the second developing roller between a second contact state in which the second developing roller is in contact with the second photosensitive member and a second separated state in which the second developing roller is separated from the second photosensitive member;
a fixing roller;
a fixing belt to form a nip together with the fixing roller;
a pressure modifying mechanism configured to modify a nip pressure at the nip to selected one of a first nip pressure and a second nip pressure smaller than the first nip pressure;
a first sheet sensor disposed upstream of the first photosensitive member in the conveyance direction of a sheet and configured to detect the sheet;
a second sheet sensor disposed downstream of the nip in the conveyance direction and configured to detect the sheet; and
a controller configured to perform:
in a case where a final sheet among one or more sheets is printed according to a print job,
switching, after the first sheet sensor detects a trailing edge of the final sheet, the state of the first developing roller to the first separated state from the first contact state by using the switching mechanism;
switching, after the state of the first developing roller is switched to the first separated state, the state of the second developing roller to the second separated state from the second contact state by using the switching mechanism;
modifying, after the second sheet sensor detects the trailing edge of the final sheet, the nip pressure to the second nip pressure from the first nip pressure by using the pressure modifying mechanism while maintaining rotation of the fixing roller; and
halting the rotation of the fixing roller after the modifying the nip pressure to the second nip pressure from the first nip pressure is completed,

wherein the modifying the nip pressure to the second nip pressure from the first nip pressure is started after the state of the second developing roller is switched to the second separated state.