Abstract: A fixing device includes a heat rotational member that fixes a toner, a pressure rotational member that presses the heat rotational member, a magnetic-flux generation unit, a detector, and a fixing controller. The magnetic-flux generation unit includes a switch unit for switching of power supply to a resonant circuit. The resonant circuit includes a coil that generates a magnetic flux for causing the heat rotational member to generate heat by induction heating, and a capacitor. The detector detects power consumption of the magnetic-flux generation unit. The fixing controller recognizes the power consumption in response to an instruction of target power, sets a switching frequency of the switch unit in accordance with the target power, and causes the switch unit to stop the power supply if a difference between the set switching frequency and the adjusted switching frequency exceeds a predetermined change width.

Abstract: A fixing unit includes a heating rotary belt, a pressing member that abuts with an inner surface of the heating rotary belt, a pressing rotor that forms a fixing nip with the heating rotary belt, a induction coil separated by a predetermined distance from the external surface of the heating rotary belt and generating a magnetic flux to generate heat in the heating rotary belt, a magnetic core portion that forms a magnetic path for the magnetic flux generated by the induction coil, and a regulating portion that regulates the deformation of the heating rotary belt by abutment with the external surface of the heating rotary belt.

Abstract: An image forming apparatus includes a controller that controls rotational driving of a magnetic roller and rotational driving of a developing roller. The controller is capable of performing a toner collecting mode when no image formation is performed. In the toner collecting mode, the magnetic roller and the developing roller are intermittently rotated in a direction reverse to a direction in which the magnetic roller and the developing roller are rotated during image formation, then the magnetic roller is made to rotate in a forward direction, and then, the magnetic roller is rotated in a backward direction.

Abstract: A fixing device includes a heat rotational member that fixes a toner, a pressure rotational member that presses the heat rotational member, a magnetic-flux generation unit, a detector, and a fixing controller. The magnetic-flux generation unit includes a switch unit for switching of power supply to a resonant circuit. The resonant circuit includes a coil that generates a magnetic flux for causing the heat rotational member to generate heat by induction heating, and a capacitor. The detector detects power consumption of the magnetic-flux generation unit. The fixing controller recognizes the power consumption in response to an instruction of target power, sets a switching frequency of the switch unit in accordance with the target power, and causes the switch unit to stop the power supply if a difference between the set switching frequency and the adjusted switching frequency exceeds a predetermined change width.

Abstract: A cleaning device for a photosensitive drum includes a cleaning roller, a cleaning blade, and a layer control member. The layer control member may include an upstream scraper having a surface that surface contacts the cleaning roller in a substantially same direction as a rotation direction of the cleaning roller. In addition, the layer control member may include a downstream scraper having an edge that contacts the cleaning roller. The downstream scraper may be positioned downstream of the contact position between the cleaning roller and the upstream scraper in the rotation direction of the cleaning roller. In some embodiments, the downstream scraper edge may line contact the cleaning roller in a direction opposing the rotation direction of the cleaning roller.

Abstract: A fixing unit includes a heating rotary belt, a pressing member that abuts with an inner surface of the heating rotary belt, a pressing rotor that forms a fixing nip with the heating rotary belt, a induction coil separated by a predetermined distance from the external surface of the heating rotary belt and generating a magnetic flux to generate heat in the heating rotary belt, a magnetic core portion that forms a magnetic path for the magnetic flux generated by the induction coil, and a regulating portion that regulates the deformation of the heating rotary belt by abutment with the external surface of the heating rotary belt.

Abstract: A cleaning device for a photosensitive drum includes a cleaning roller, a cleaning blade, and a layer control member. The layer control member may include an upstream scraper having a surface that surface contacts the cleaning roller in a substantially same direction as a rotation direction of the cleaning roller. In addition, the layer control member may include a downstream scraper having an edge that contacts the cleaning roller. The downstream scraper may be positioned downstream of the contact position between the cleaning roller and the upstream scraper in the rotation direction of the cleaning roller. In some embodiments, the downstream scraper edge may line contact the cleaning roller in a direction opposing the rotation direction of the cleaning roller.