Patent ID: 8086134

Claim:
A developing unit comprising: a developer carrier configured to carry a developer, the developer carrier having axial end parts; a housing that rotatably supports the developer carrier and that has a supply port, through which the developer is configured to be supplied to the developer carrier; and a side sealing member that is disposed between one of the axial end parts of the developer carrier and a portion of the housing adjacent to the supply port and that is slidingly contactable with the developer carrier; wherein the side sealing member includes an upstream side seal and a downstream side seal that is disposed on a downstream side in a rotational direction of the developer carrier relative to the upstream side seal; the upstream side seal is configured to convey the developer on the upstream side seal in an oblique first direction toward the supply port and the downstream side when the developer carrier is rotated in the rotational direction, the upstream side seal has implanted capillary members slidingly contactable with the developer carrier, the capillary members being tilted in the first direction, and the downstream side seal is configured to convey the developer on the downstream side seal in a second direction toward the downstream side when the developer carrier is rotated in the rotational direction.