Patent ID: 11914324
Assignee: BROTHER KOGYO KABUSHIKI KAISHA
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 3:
4. The image forming apparatus according to claim 1,
wherein the cartridge includes a detection gear rotatable about an axis extending in a prescribed direction, the detection gear including a protrusion rotatable together with the detection gear,
wherein, in the determining whether the cartridge attached to the main casing is unused, the controller determines that the cartridge is unused based on movement of the protrusion in accordance with rotation of the detection gear when the cartridge is attached to the main casing, and
wherein the controller is configured to further perform:
determining, in response to determining that the cartridge is unused, the consumption state information based on the movement of the protrusion; and
storing the determined consumption state information in both the first memory and the second memory.