Patent ID: 8565653

Claim:
A developing device comprising: a developing member having an outer surface configured to carry a developing agent; a supply member configured to supply the developing member to the outer surface and be rotatable in a rotational direction; a developing agent container disposed below the developing member and the supply member and having an inner surface defining an internal space for accommodating the developing agent, the developing agent container being formed with an opening having an upper edge and a lower edge; and a conveying member rotatably disposed in the internal space and in rotational contact with the inner surface and configured to convey the developing agent upward, wherein the developing agent container includes a first wall portion extending from the lower edge in a downstream direction with respect to a rotational direction of the conveying member and also includes a second wall portion extending from the upper edge in an upstream direction with respect to the rotational direction; and wherein the conveying member is configured to be rotated in a direction the same as the rotational direction of the supply member, and wherein the conveying member is configured to be in simultaneous sliding contact with both the lower edge and the upper edge to convey the developing agent onto the first wall portion.