Seal member, unit, and image forming apparatus

A unit attachable to and detachable from an apparatus main body of an image forming apparatus, the unit comprising:

• a frame body which is provided with a housing portion for housing a developer;
• a roller which is provided so as to face an opening of the housing portion of the frame body;
• a blade which comes into contact with a circumferential surface of the roller;
• and
• a seal member which is provided on a region of the frame body outside the opening of the housing portion in a axial direction of the roller and extends in a direction along the circumferential surface of the roller, so as to seal a gap between the frame body and the roller and a gap between the blade and the frame body, to prevent a leakage of the developer, the seal member including:
• a first surface which comes into contact with the circumferential surface of the roller;
• a second surface configured to come into contact with a surface of the blade opposite to a surface of the blade contacting the roller,
• wherein, in a case where the roller is not provided on the frame body, the second surface (i) is recessed, with respect to the first surface, in a direction approaching the frame body and (ii) includes an arc shaped part protruding in the direction approaching the frame body when viewed in the axial direction of the roller, and
• wherein, in a case where the roller is provided on the frame body, the arc shaped part of the second surface comes into contact with the surface of the blade opposite to the surface of the blade contacting the roller;
• and
• a third surface which is continuously arranged between the first surface and the second surface,
• wherein the third surface faces a tip of the blade when viewed in the axial direction of the roller.

A unit attachable to and detachable from an apparatus main body of an image forming apparatus, the unit comprising:

• a frame body which is provided with a housing portion for housing a developer;
• a roller which is provided so as to face an opening of the housing portion of the frame body;
• a blade which comes into contact with a circumferential surface of the roller;
• and
• a seal member which is provided on a region of the frame body outside the opening of the housing portion in an axial direction of the roller and extends in a direction along the circumferential surface of the roller, so as to seal a gap between the frame body and the roller and a gap between the blade and the frame body, to prevent a leakage of the developer, the seal member including:
• a first surface which comes into contact with the circumferential surface of the roller;
• and
• a second surface configured to come into contact with a surface of the blade opposite to a surface of the blade contacting the roller,
• wherein, in a case where the roller is not provided on the frame body, the second surface (i) is recessed, with respect to the first surface, in a direction approaching the frame body and (ii) includes an arc shaped part protruding in the direction approaching the frame body when viewed in the axial direction of the roller, and
• wherein, in a case where the roller is provided on the frame body, the arc shaped part of the second surface comes into contact with the surface of the blade opposite to the surface of the blade contacting the roller.