Image forming apparatus with mechanism for restricting removal of developing device

1. An image forming apparatus, comprising:

a main body housing;

an image carrier that is stored in the main body housing and has a circumferential surface on which an electrostatic latent image is formed;

a developing device that is stored detachably in the main body housing and supplies a developer to the electrostatic latent image to develop the electrostatic latent image;

a developer container that is stored detachably in the main body housing and supplies the developer to the developing device; and

an interference mechanism that disables the developing device from being removed from the main body housing, in a state where the developer container is mounted to the main body housing.

2. The image forming apparatus according to claim 1 , wherein

the main body housing has a first surface and a second surface located in a different section from the first surface,

the developing device is attached to and detached from the main body housing through the first surface, and

the developer container is attached to and detached from the main body housing through the second surface.

3. The image forming apparatus according to claim 1 , further comprising:

another unit stored in the main body housing,

wherein the interference mechanism is configured by a first locking piece provided in the developing device and a second locking piece provided in the other unit,

the first locking piece and the second locking piece are brought into engagement with each other when the developer container is mounted to the main body housing, and

the engagement between the first locking piece and the second locking piece is released when the developer container is removed from the main body housing.

4. The image forming apparatus according to claim 3 , wherein

the developing device has a developing housing provided with a developer replenishing port, a shutter member capable of changing a posture thereof between a closing posture for covering the replenishing port and an opening posture for opening the replenishing port, and a biasing member for biasing the shutter member in a direction of the closing posture,

the developer container has a pressing part that interferes with the shutter member when the developer container is mounted to the main body housing and that changes the posture of the shutter member to the opening posture against the bias of the biasing member,

the first locking piece is provided in the shutter member,

the first locking piece and the second locking piece are brought into engagement with each other by changing the posture of the shutter member to the opening posture as a result of the interference between the pressing part and the shutter member that takes place when the developer container is mounted to the main body housing, and

the engagement between the first locking piece and the second locking piece is released as the bias of the biasing member changes the posture of the shutter member to the closing posture when the interference between the pressing part and the shutter member is released as a result of removing the developer container from the main body housing.

5. The image forming apparatus according to claim 4 , wherein

the developing device has a developing roller for carrying the developer,

the developing housing is a housing elongating in an axial direction of the developing roller, and

the developer container is installed in the developing device from a direction perpendicular to the axial direction within a horizontal plane.

6. The image forming apparatus according to claim 3 , wherein

the other unit is a collection container that is stored detachably in the main body housing and collects a waste developer, and

the collection container is mounted to the main body housing such that the collection container cannot be removed from the main body housing when the developer container is mounted to the main body housing.