Patent ID: 9632459
Date: 2017-04-25
CPC Classifications: G03G

Claim:
1. A developing device comprising: a developer carrying member for carrying a two component developer comprising toner and carrier; a first chamber configured to accommodate the developer; a second chamber in fluid communication with said first chamber to constitute a circulation path along which the developer circulates; a partition for partitioning between said first chamber and said second chamber; a first feeding member rotatably provided in said first chamber and configured to feed the developer in a first direction; a second feeding member rotatably provided in said second chamber and configured to feed the developer, said second feeding member including a first spiral portion configured to feed the developer in a second direction opposite to the first direction, a second spiral portion provided downstream of said first spiral portion with respect to the second direction to feed the developer in the first direction, a disk portion provided downstream of said second spiral portion with respect to the second direction, and a shaft portion provided downstream of said second spiral portion with respect to the second direction; a discharge opening provided at a position downstream of said disk portion with respect to the second direction and configured to discharge the developer; a stepped portion provided in said second chamber at a position downstream of said disk portion and upstream of said discharge opening with respect to the second direction, said stepped portion having a height high enough to oppose a lateral surface of said disk portion; and a projected portion projected from a part of said disk portion that opposes said stepped portion.