Abstract:
An image forming apparatus includes an image carrier, a developer carrier, a toner carrier, a bias voltage control unit, and a detection unit. The developer carrier carries a developer layer containing toner, an additive and carriers thereon. The toner carrier supplies toner to the image carrier. The bias voltage control unit changes bias voltage setting from ordinary developing mode to toner removing mode when the detection unit detects toner adhesion in excess of a threshold value on the toner carrier. In the toner removing mode, the bias voltage control unit sets the bias voltage to be applied to the image carrier, the developer carrier, and the toner carrier so that only the additive remains on the circumferential surface of the toner carrier, and the developer layer carried on the developer carrier contacts the circumferential surface of the toner carrier with a larger force, as compared with the ordinary developing mode.
Abstract:
An image forming apparatus uses a developer containing toner particles. The image forming apparatus includes a toner-particle bearing member for bearing the toner particles. Each toner particle includes a toner core containing a binder resin and a shell layer coating a surface of the toner core. The toner-particle bearing member includes a substrate and a surface layer coating a surface of the substrate. The surface layer and the shell layer are each formed from a resin containing a thermosetting resin.
Abstract:
The developing device includes a toner layer formation control unit instructing a voltage control unit to set a first voltage difference to form a toner layer on a surface of a toner supporting rotator, a stripping control unit that instructs the voltage control unit to, in a toner layer stripping mode, set a second voltage difference that moves substantially an entire amount of toner composing the toner layer to a developer supporting rotator, and a density detection unit detecting the toner density on a transfer member onto which a toner image is primarily transferred. When the toner remains on a surface of the toner supporting rotator, the stripping control unit causes the toner to fly to the surface of the image carrier, while outputting an instruction adjusting the second voltage difference to the voltage control unit in order to reduce the toner density detected by the toner density detection unit.
Abstract:
An image forming apparatus includes an image carrier, a developer carrier, a toner carrier, a bias voltage control unit, and a detection unit. The developer carrier carries a developer layer. The toner carrier supplies toner to the image carrier. The bias voltage control unit changes bias voltage setting from ordinary developing mode to toner removing mode when the detection unit detects toner adhesion in excess of a threshold value on the toner carrier. In the toner removing mode, the bias voltage control unit sets the bias voltage to be applied to the image carrier, the developer carrier, and the toner carrier in such a manner that only the additive remains on the circumferential surface of the toner carrier, and the developer layer carried on the developer carrier comes into contact with the circumferential surface of the toner carrier with a large force, as compared with the ordinary developing mode.
Abstract:
The developing device of the present disclosure comprises a developing container, toner carrier, developer carrier, regulating member, and air outflow channel. The developing container accommodates a two-component developer. The toner carrier supplies toner to an image carrier. The developer carrier rotates so that a surface facing the toner carrier moves in the opposite direction of the toner carrier, and a toner layer is formed on the toner carrier. The regulating member regulates the amount of developer carried on the developer carrier. The air outflow channel communicates an airflow outlet formed in the top end of the developing container facing the toner carrier with the interior of a duct placed above the developing container, and the air outflow channel is inclined downstream in the rotational direction of the toner carrier relative to a straight line passing through the rotational axis center of the toner carrier and the airflow outlet.