Developer cartridge and developing apparatus

A developing apparatus comprising:

• a developer carrying member for carrying a developer for developing an electrostatic image on an image bearing member;
• a developer container for containing a developer to be carried on said developer carrying member, said developer container including a developer receiving portion for receiving developer;
• a shutter for opening and closing said developer receiving portion;
• and
• a developer cartridge detachably mountable to said developer container for supplying developer to said developer container through the developer receiving portion said cartridge comprising:
• a cylindrical portion for accommodating a developer, said cylindrical portion being provided with an opening extending along a length thereof;
• a sealing member for sealing the opening;
• a first projection engageable with said shutter for moving the shutter to an open position for the developer receiving opening in interrelation with rotation of said developer cartridge in a first direction;
• and
• a second projection engagable with said shutter for moving the shutter to a closed position for the developer receiving opening in interrelation with rotation of said developer cartridge in a second direction which is opposite the first direction, said first projection and said second projection projecting out of a longitudinal extension of the opening.