Patent ID: 9658572
Date: 2017-05-23
CPC Classifications: G03G

Claim:
1. A developing device comprising: a developer container for storing two-component developer containing carrier and toner, the developer container including a plurality of transport chambers, including a first transport chamber and a second transport chamber, arranged side by side, a communication portion through which the first and second transport chambers communicate with each other in opposite end parts thereof in a longitudinal direction thereof, a developer supply port through which developer is supplied into the developer container, and a developer discharge port through which surplus developer is discharged, the developer discharge port being arranged in a downstream-side end part of the second transport chamber; a first stirring member composed of a rotary shaft and a first transport blade formed on a circumferential surface of the rotary shaft, for stirring and transporting developer inside the first transport chamber in an axial direction of the rotary shaft; a second stirring member composed of a rotary shaft and a second transport blade formed on a circumferential surface of the rotary shaft, for stirring and transporting developer inside the second transport chamber in an opposite direction to the first stirring member; and a developer carrying member rotatably supported on the developer container, for carrying the developer inside the second transport chamber on a surface of the developer carrying member, wherein the second stirring member comprises: a regulating portion composed of an outer diameter of the first and second regulating blades is smaller than an outer diameter of the second transport blade.