Developing device and image forming apparatus

A developing device comprising:

• a developing containing case that contains a developer and comprises a case main body and a supply roller that is rotatably supported on the case main body,
• wherein the supply roller has a rotary shaft, a cylindrical roller main body that covers the rotary shaft, and a fixed member that is fixed to at least one of the rotary shaft and the roller main body,
• a gap is provided between an end surface of the roller main body and an inner surface of the case main body, and
• the fixed member partially occupies the gap, and in plan view of the end surface of the roller main body, the fixed member has a rectangular shape that extends from a vicinity of a center of the end surface of the roller main body radially outward.

A developing device comprising:

• a developer containing case that contains a developer and comprises a case main body and a supply roller that is rotatably supported on the case main body,
• wherein the supply roller has a rotary shaft, a cylindrical roller main body that covers the rotary shaft, and a fixed member that is fixed to at least one of the rotary shaft and the roller main body,
• a gap is provided between an end surface of the roller main body and an inner surface of the case main body, and
• the fixed member partially occupies the gap, and in plan view of the end surface of the roller main body, the fixed member extends from a vicinity of a center of the end surface of the roller main body radially outward and bends in a reverse rotation direction of the supply roller.

A developing device comprising:

• a developer containing case that contains a developer and comprises a case main body and a supply roller that is rotatably supported on the case main body,
• wherein the supply roller has a rotary shaft, a cylindrical roller main body that covers the rotary shaft, and a fixed member that is fixed to at least one of the rotary shaft and the roller main body,
• a gap is provided between an end surface of the roller main body and an inner surface of the case main body, and
• the fixed member partially occupies the gap, and in plan view of the end surface of the roller main body, the fixed member has a sectoral shape that is widened from a vicinity of a center of the end surface of the roller main body radially outward.

A developer device comprising:

• a developer containing case that contains a developer and comprises a case main body and a supply roller that is rotatably supported on the case main body;
• a developing roller that is rotatably supported on the case main body;
• and
• a side seal member that is fixed to the case main body,
• wherein the developing roller comes into contact with the supply roller and is disposed outside the case main body,
• the case main body has a region that opposes a rotary surface of the developing roller at an end in a rotary shaft direction of the developing roller,
• the side seal member is disposed in the opposing region and comes into contact with the developing roller,
• the end surface of the roller main body of the supply roller opposes the case main body and the side seal member,
• the supply roller has a rotary shaft, a cylindrical roller main body that covers the rotary shaft, and a fixed member that is fixed to at least one of the rotary shaft and the roller main body,
• a gap is provided between an end surface of the roller main body and an inner surface of the case main body,
• the fixed member partially occupies the gap,
• the side seal member has a first layer that is fixed to the ease main body, and a second layer that is laminated on the first layer and comes into contact with the developing roller,
• the first layer is formed of an elastic material, and
• the second layer is formed of a fiber material.

A developing device comprising:

• a developer containing case that contains a developer and comprises a case main body and a supply roller that is rotatably supported on the case main body;
• a developing roller that is rotatably supported on the case main body;
• a side seal member that is fixed to the case main body;
• and
• a layer-thickness regulating member that is fixed to the main body case, comes into contact with the developing roller, and regulates a thickness of the developer carried on the developing roller,
• wherein a cutout is provided at a predetermined position of the layer-thickness regulating member,
• the predetermined position is a position corresponding to the end in a rotary shaft direction of the developing roller,
• the fixed member has such a length that enters the cutout during rotation of the supply roller,
• the developing roller comes into contact wit the supply roller and is disposed outside the case main body,
• the case main body has a region that opposes a rotary surface of the developing roller at an end in a rotary shaft direction of the developing roller,
• the side seal member is disposed in the opposing region and comes into contact with the developing roller,
• the end surface of the roller main body of the supply roller opposes the case main body and the side seat member,
• the supply roller has a rotary shaft, a cylindrical roller main body that covers the rotary shaft, and a fixed member that is fixed to at least one of the rotary shaft and the roller main body,
• a gap is provided between an end surface of the roller main body and an inner surface of the case main body, and
• the fixed member partially occupies the gap.

A developing device comprising:

• a developer containing case that contains a developer and has an opening;
• a developing roller that is rotatably provided in the developer containing case and extending along the opening to carry the developer;
• a seal member that is provided between ends of the opening in a direction of a developing roller shaft and axial ends of the developing roller;
• a layer-thickness regulating blade having a layer-thickness regulating portion that is provided in the developer containing case so as to extend toward the opening and comes into contact with the developing roller, and a cutout that comes into contact with the seal member;
• a rotary member that is provided at a position corresponding to the cutout in the developer containing case and rotates around an axis parallel to a developing roller shaft;
• a supply roller that is rotatably provided in the developer containing case extending along the opening and supplies the developer to the developing roller;
• and
• a connection member that connects the supply roller and the rotary member and transfers a driving force of the supply roller to the rotary member.