DEVELOPING APPARATUS USABLE WITH IMAGE FORMING APPARATUS, IMAGE FORMING APPARATUS HAVING THE SAME, METHOD TO PREVENT DEVELOPER FROM FLOWING OUT THE DEVELOPING APPARATUS

摘要

A developing apparatus usable with an image forming apparatus includes a developer carrier includes a plurality of magnetic poles and a case to rotatably support the developer carrier, the case storing developer is supplied to the developer carrier, and a magnetic pole changing apparatus disposed at an end of the developer carrier to change a position of the plurality of magnetic poles with respect to the case.