Patent ID: 8606139
Filing Date: 2013-12-10
Classification: G03G

Abstract:
1. A development device comprising: a casing configured to accommodate development agent, the casing having an opening; a developing member rotatably supported, in the opening, by the casing, the developing member being configured to hold development agent on an outer circumferential surface thereof; a first seal member extending in a first direction parallel to a rotational axis of the developing member, from the casing to the outer circumferential surface of the developing member, the first seal member comprising a base end provided at a side of the casing and a free end provided at a side of the outer circumferential surface of the developing member, the free end contacting an entire length, in the first direction, of the outer circumferential surface of the developing member so as to prevent the development agent accommodated in the casing from leaking from between the casing and the outer circumferential surface of the developing member; and an elastic member disposed between the casing and the free end of the first seal member so as to face the entire length, in the first direction, of the outer circumferential surface of the developing member, the elastic member being configured to press the free end of the first seal member against the entire length, in the first direction, of the outer circumferential surface of the developing member, the elastic member being configured to press both the free end of the first seal member and a portion of the outer circumferential surface of the developing member, which portion is adjacent to the free end of the first seal member.