An image forming apparatus includes a developing device for developing an electrostatic image formed on an image bearing member with a magnetic developer; a supply tube for supplying the magnetic developer into the developing device; a feeding screw for feeding the magnetic developer in the supply tube; and a magnetic member for confining the magnetic developer in a clearance between the supply tube and the feeding screw, wherein the magnetic member is extended along an outer configuration of the feeding screw.

 
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< Developer supply container detachably mountable to image forming apparatus detecting the amount of developer remaining in the container

< Image forming apparatus including two developer carrying members wherein potential differences between the developer carrying members and a common voltage source differ

> Sheet discharging apparatus, and sheet treating apparatus and image forming apparatus using the sheet discharging apparatus

> Image forming apparatus which controls transferring timing to the paper according to a change of process speed
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