Image forming apparatus

An image forming apparatus comprising:

• a rotary configured to rotate and including a developing roller and a storage portion configured to store toner to be supplied to the developing roller;
• a toner cartridge that is configured to store the toner and that is attachable to and detachable from the rotary;
• a support member attached to the rotary, configured to support the toner cartridge, and movable between a first position and a second position, the first position being a position where supply of the toner from the toner cartridge to the storage portion is allowed, the second position being a position where attachment and detachment of the toner cartridge to and from the rotary are allowed;
• a drive source configured to move the support member in a first direction from the first position toward the second position and move the support member in a second direction from the second position toward the first position;
• a detection mechanism including a moving member configured to move in an interlocked manner with movement of the support member by the drive source, and a sensor portion configured to output a signal corresponding to a position of the moving member;
• and
• a controller configured to receive the signal from the sensor portion and control the drive source,
• wherein the sensor portion is in a first detection state in a case where the support member is at the first position and in a case where the support member is at the second position, and the sensor portion is in a second detection state different from the first detection state while the support member is being moved from the first position toward the second position or from the second position toward the first position,
• wherein the controller is configured to determine that the support member is in the second position in a case where movement direction of the support member by the drive source is the first direction and the sensor portion is in the first detection state, and
• wherein the controller is configured to determine that the support member is in the first position in a case where the movement direction of the support member by the drive source is the second direction and the sensor portion is in the first detection state.