Patent ID: 9632458
Date: 2017-04-25
CPC Classifications: G03G

Claim:
1. A developing device comprising: a developer storage portion configured to store developer; and a developer agitation portion configured to rotate in the developer storage portion to agitate the developer; wherein the developer agitation portion includes a plurality of agitation blade portions which include a set of two trap agitation blades adjacent in an axis direction of the developer agitation portion, and the two trap agitation blades are disposed in a direction intersecting with the axis direction, wherein the plurality of agitation blade portions are arranged with being shifted from one another in a circumferential direction and a longitudinal direction of the developer agitation portion, wherein the two trap agitation blades adjacent in the axis direction alternately include an agitation collection portion, a width of which becomes gradually narrower with respect to the rotation direction of the developer agitation portion.