Patent ID: 9618880
Date: 2017-04-11
CPC Classifications: G03G

Claim:
1. A developing device comprising: a developer bearing member configured to bear developer; a development chamber including the developer bearing member; a developer storage chamber configured to store developer to be supplied to the development chamber; a partition configured to separate the development chamber and the developer storage chamber and having an opening that allows communication between the developer storage chamber and the development chamber; a rotating shaft configured to be rotatable and provided inside the developer storage chamber; a first sheet member attached to the rotating shaft; a second sheet member attached to the rotation shaft; and a plurality of protruding portions configured to protrude toward the inside of the developer storage chamber from the partition, wherein in a rotation radial direction of the rotating shaft, a length of the first sheet member is shorter than a length of the second sheet member, and the first sheet member contacts the plurality of protruding portions so that a space is formed between the first sheet member and a plane portion of the partition which forms the opening.