Image forming apparatus

An image forming apparatus comprising:

• an image bearing member;
• a rotatable developer bearing member configured to supply a developer to the image bearing member;
• a first driving unit configured to rotationally drive the developer bearing member;
• a developer storage unit in which the developer bearing member is arranged and the developer is stored;
• a rotatable agitation member that is arranged in the developer storage unit, and configured to agitate the developer;
• a second driving unit configured to rotationally drive the agitation member;
• a developer detection unit arranged in the developer storage unit, and configured to detect information regarding the developer stored in the developer storage unit;
• an attachment portion comprising a replenishment port that communicates with the developer storage unit, the attachment portion being configured to detachably receive a replenishment container;
• and
• a control unit configured to control the first driving unit and the second driving unit,
• wherein the control unit is configured to execute a replenishment operation for replenishing the developer to the developer storage unit,
• wherein, during the replenishment operation, the developer is replenished to the developer storage unit through the replenishment port from the replenishment container attached to the attachment portion,
• wherein the replenishment operation is executed in a state in which rotation of the developer bearing member and the agitation member is stopped, without performing a rotational operation of the developer bearing member and the agitation member, and
• wherein the control unit is configured, during the replenishment operation, to control the first driving unit and the second driving unit based on the information regarding the developer.