US 2022/0091553 A1Published application

Image forming apparatus having deterioration quantity of photosensitive drum determining capability

AssigneeBrother Kogyo Kabushiki Kaisha

InventorsAyaka KOMORI, Shintaro SUZUKI, Sota HIRANO, Kazuma HINOUE, Marika OZAKI

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Abstract

An image forming apparatus including a motor, a photosensitive drum, a developing roller, a main memory, and a controller. The controller is configured to perform storing a first rotation number and a second rotation number in the main memory. The first rotation number is the rotation number of the photosensitive drum rotated in a first state where the photosensitive drum rotates and the developing roller is stopped. The second rotation number is the rotation number of the photosensitive drum rotated in a second state where the photosensitive drum rotates and the developing roller rotates. The controller is further configured to perform, in a case where the photosensitive drum rotates, determining a total deterioration quantity of the photosensitive drum which is a cumulative deterioration quantity of the photosensitive drum based on the first rotation number and the second rotation number.

Claims28

Dependent claims

An image forming apparatus comprising:

a motor;
a photosensitive drum;
a first clutch configured to transmit a driving force of the motor to the photosensitive drum, the first clutch being switchable between a state for allowing the photosensitive drum to rotate and a state for stopping rotation of the photosensitive drum;
a developing roller;
a second clutch configured to transit the driving force of the motor to the developing roller, the second clutch being switchable between a state for allowing the developing roller to rotate and a state for stopping rotation of the developing roller;
a main memory;
and
a controller configured to perform:
storing a first rotation number and a second rotation number in the main memory, the first rotation number being the rotation number of the photosensitive drum rotated in a first state where the photosensitive drum rotates but the developing roller is stopped, the second rotation number being the rotation number of the photosensitive drum rotated in a second state where the photosensitive drum rotates and the developing roller rotates;
and
in a case where the photosensitive drum rotates, determining a total deterioration quantity of the photosensitive drum which is a cumulative deterioration quantity of the photosensitive drum based on the first rotation number and the second rotation number.

8 more elements

A drum cartridge comprising:

a photosensitive drum;
a developing roller;
and
a drum memory including:
a first storage region storing a first rotation number which is the rotation number of the photosensitive drum rotated in a first state where the photosensitive drum rotates but the developing roller is stopped;
and
a second storage region storing a second rotation number which is the rotation number of the photosensitive drum rotated in a second state where the photosensitive drum rotates and the developing roller rotates.

4 more elements

Dependencies are inferred from the claim text.