Patent ID: 8577265

Claim:
A developing device usable with an image forming apparatus, the developing device comprising: a developer storage unit; a first rotating member arranged in the developer storage unit; a plurality of developer delivery members arranged in an axial direction of the first rotating member to be rotated around the first rotating member upon receiving rotation power from the first rotating member; and a first power-transmission structure to connect at least one of the plurality of developer delivery members and the first rotating member to each other, such that there is slip between the at least one of the plurality of developer delivery members and the first rotating member, the first power-transmission structure including: at least one protrusion to protrude from one of the at least one of the plurality of developer delivery members and the first rotating member; and at least one receiving hole formed in the other one of the at least one of the plurality of developer delivery members and the first rotating member, so as to receive the protrusion, wherein the at least one protrusion includes a slip guide portion formed at a surface thereof to guide the slip between the receiving hole and the protrusion.