Patent ID: 8532541

Claim:
An image forming apparatus comprising: (i) a detachably mountable cartridge including (i-i) an image bearing member, (i-ii) a developing unit for developing an electrostatic latent image formed on said image bearing member, (i-iii) a developer receiving opening provided on said developing unit for receiving a developer, and (i-iv) a first shutter rotatable to open and close said developer receiving opening; (ii) a detachably mountable developer supply container including (ii-i) a developer accommodating portion for accommodating the developer, (ii-ii) a discharge opening for discharging the developer; and (ii-iii) a second shutter rotatable to open and close said discharge opening; and (iii) a developer supplying mechanism for supplying the developer to said developer receiving opening through said discharge opening, wherein said developer supply mechanism is provided such that said developer receiving opening is disposed below said discharge opening.