Image forming apparatus and developing apparatus

An image forming apparatus comprising:

• an apparatus body;
• a developing apparatus detachably attached to the apparatus body and comprising:
• a developer container, configured to store developer containing non-magnetic toner and magnetic carrier, with a discharge port through which the developer in the developer container is discharged;
• a shutter configured to move between an opening position and a closing position, the opening position being a position at which the shutter opens the discharge port, the closing position being a position at which the shutter closes the discharge port;
• and
• a shutter urging member configured to urge the shutter so that the shutter is positioned at the closing position;
• an abutment member movably disposed on the apparatus body, and configured to abut against the shutter when the developing apparatus is inserted and push the shutter toward a direction opposite to a direction in which an urging force of the shutter urging member is applied;
• and
• a restricting member detachably attached to the developing apparatus and configured to restrict the abutment member from being positioned at such a position that the abutment member moves the shutter to the opening position when the developing apparatus is attached to the apparatus body.

A developing apparatus configured to be inserted into and attached to an image forming apparatus, the developing apparatus comprising:

• a developer container, configured to store developer containing non-magnetic toner and magnetic carrier, with a discharge port through which the developer in the developer container is discharged;
• a shutter configured to move between an opening position and a closing position, the opening position being a position at which the shutter opens the discharge port, the closing position being a position at which the shutter closes the discharge port;
• a shutter urging member configured to urge the shutter toward the closing position;
• and
• an attachment portion to which an obstructing member, configured to obstruct the shutter from moving from the closing position to the opening position is attached.