Abstract: In a developing device, a sheet member is provided via a gap at a second specific position in a specific region between a position on a downstream side in a first rotation direction relative to a first specific position, and a high-magnetic-force position at which an intensity of a magnetic force is the highest in a second region, on the outer circumferential surface of a developer carrying body. The sheet member limits a layer thickness of a two-component developer carried on the developer carrying body rotating in a second rotation direction. The sheet member is able to elastically deform in accordance with application of a pressing force equal to or greater than a tolerable value in the first rotation direction or the second rotation direction.

Abstract: A developing device includes a housing, a development roller, and a roller gear. The roller gear is disposed at one axial end of the development roller and transmits a rotational drive force to the development roller. The development roller includes a sleeve and a coating layer. The coating layer is formed by dipping the sleeve in a dipping bath with the sleeve directed axially vertically. The development roller is mounted to the housing such that a lower axial end of the development roller at the time of the dipping is an opposite axial end to the one axial end at which the roller gear is disposed.

Abstract: A developing device supplies a developer to a photosensitive drum, which has a cylindrical shape, and is rotatable around an axis thereof for forming an electrostatic latent image on the circumferential surface thereof. The developing device is provided with a developing roller. The developing roller is disposed to face the photosensitive drum, and has a cylindrical shape. The developing roller is rotatable around an axis thereof for carrying a developer on the circumferential surface thereof. The developing roller is provided with a small diameter portion. The small diameter portion is a part of the circumferential surface of the developing roller. The small diameter portion extends from an axial end of the developing roller axially inward by a predetermined length, and has an outer diameter smaller than an axially middle portion of the developing roller.

Abstract: The present disclosure relates to a developing roller having a conductive support base, a surface of which is covered with a resin layer, wherein the resin layer contains conductive fine particles and soluble nylon serving as a binder resin, and the resin layer surface has a surface roughness Ra of at least 0.4 ?m, a waviness curve cycle of 50 to 400 ?m, and a waviness curve height of 2 to 10 ?m.

Abstract: A developing device includes a housing, a development roller, and a roller gear. The roller gear is disposed at one axial end of the development roller and transmits a rotational drive force to the development roller. The development roller includes a sleeve and a coating layer. The coating layer is formed by dipping the sleeve in a dipping bath with the sleeve directed axially vertically. The development roller is mounted to the housing such that a lower axial end of the development roller at the time of the dipping is an opposite axial end to the one axial end at which the roller gear is disposed.

Abstract: A developing device supplies a developer to a photosensitive drum, which has a cylindrical shape, and is rotatable around an axis thereof for forming an electrostatic latent image on the circumferential surface thereof. The developing device is provided with a developing roller. The developing roller is disposed to face the photosensitive drum, and has a cylindrical shape. The developing roller is rotatable around an axis thereof for carrying a developer on the circumferential surface thereof. The developing roller is provided with a small diameter portion. The small diameter portion is a part of the circumferential surface of the developing roller. The small diameter portion extends from an axial end of the developing roller axially inward by a predetermined length, and has an outer diameter smaller than an axially middle portion of the developing roller.

Abstract: An image forming apparatus includes a sheet conveyance passage, a photosensitive drum, a transfer unit, a fixing section, a conveyance unit, one or more detection sensors, an airflow generating section, a cooling airflow passage, and a shielding member. The conveyance unit is at an opposite side of the transfer unit from the photosensitive drum with a predetermined clearance from the transfer unit. Each detection sensor is disposed to face the transfer unit in cross section intersecting the axial direction of the photosensitive drum. The sheet detection sensor performs a predetermined detection. The airflow generating section causes a cooling airflow to flow between the transfer unit and the conveyance unit in the axial direction. The cooling airflow passage guides the cooling airflow toward each detection sensor. The shielding member blocks an airflow from a location around the transfer unit toward the cooling airflow passage in a direction intersecting the axial direction.

Abstract: The present disclosure relates to a developing roller having a conductive support base, a surface of which is covered with a resin layer, wherein the resin layer contains conductive fine particles and soluble nylon serving as a binder resin, and the resin layer surface has a surface roughness Ra of at least 0.4 ?m, a waviness curve cycle of 50 to 400 ?m, and a waviness curve height of 2 to 10 ?m.

Abstract: A developing roller includes a roller main body disposed to face, without contact, an outer circumferential surface of an image carrier. A resin coat layer has been formed on an outer circumferential surface of the roller main body, the resin coat layer being made of a resin material having electric conductivity. A product of resistance component Rs [?] and electrostatic capacitance component Cs [F] in AC impedance Z of the roller main body is in a range from 2.79×10?7 to 6.77×10?5, the AC impedance Z being obtained when an AC voltage of a predetermined frequency f is applied.

Abstract: A developing roller includes a roller main body disposed to face, without contact, an outer circumferential surface of an image carrier. A resin coat layer has been formed on an outer circumferential surface of the roller main body, the resin coat layer being made of a resin material having electric conductivity. A product of resistance component Rs [?] and electrostatic capacitance component Cs [F] in AC impedance Z of the roller main body is in a range from 2.79×10?7 to 6.77×10?5, the AC impedance Z being obtained when an AC voltage of a predetermined frequency f is applied.

Abstract: An image forming apparatus includes a sheet conveyance passage, a photosensitive drum, a transfer unit, a fixing section, a conveyance unit, one or more detection sensors, an airflow generating section, a cooling airflow passage, and a shielding member. The conveyance unit is at an opposite side of the transfer unit from the photosensitive drum with a predetermined clearance from the transfer unit. Each detection sensor is disposed to face the transfer unit in cross section intersecting the axial direction of the photosensitive drum. The sheet detection sensor performs a predetermined detection. The airflow generating section causes a cooling airflow to flow between the transfer unit and the conveyance unit in the axial direction. The cooling airflow passage guides the cooling airflow toward each detection sensor. The shielding member blocks an airflow from a location around the transfer unit toward the cooling airflow passage in a direction intersecting the axial direction.