Patent ID: 8391752

Claim:
A developer unit for an image forming apparatus to form an image on a recording sheet, comprising: a developer device comprising: a developer agent carrier, which is configured to carry a developer agent on a surface thereof, and a developer agent supplier, which is configured to supply the developer agent to the developer agent carrier; and a developer agent container, which is configured to contain the developer agent to be supplied to the developer device and is arranged in a lower position with respect to the developer device, wherein the developer agent container comprises a fitting wall, which is curved inward at a position adjacent to the developer device; wherein the fitting wall has: a feeding opening, through which the developer agent in the developer agent container is supplied to the developer device, and a collecting opening, through which at least a portion of the developer agent in the developer device is retrieved back to the developer agent container; and wherein the developer unit further comprises: a first conveyer, which is configured to rotate about a rotation axis to sweep an inner surface of the developer agent container and to convey the developer agent toward the feeding opening; and a second conveyer, which is disposed above the first conveyor, arranged along the developer agent supplier, and configured to convey the developer agent toward the collecting opening.