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

Claim 0:
1. An image forming device comprising:
a photosensitive member;
a developing roller configured to supply developer to the photosensitive member;
a switch mechanism configured to switch a state of the developing roller between a contact state in which the developing roller is in contact with the photosensitive member and a separated state in which the developing roller is separated from the 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, wherein the pressure modifying mechanism includes a cam configured to pivotally move between a first positon at which the nip pressure becomes the first nip pressure and a second position at which the nip pressure becomes the second nip pressure;
a first sheet sensor disposed upstream of the photosensitive member in a 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 developing roller to the separated state from the 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, wherein the cam starts pivotally moving from the first position to the second position after the state of the developing roller is switched to the separated state; 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.