Abstract: According to one embodiment, an image forming apparatus includes a photoreceptor, a charging member, an application unit, and a control unit. An image is formed on the photoreceptor. The charging member is in contact with or close to a surface of the photoreceptor. The application unit applies a voltage to the charging member. The control unit performs control so that a current flowing through the charging member and the photoreceptor becomes a constant current when the photoreceptor is in an unused state, measures a voltage when the constant current flows and stores the measured voltage as a reference voltage, and controls the application unit to apply a voltage obtained by adding correction according to a value indicating a usage amount of the photoreceptor to the reference voltage.

Abstract: According to one embodiment, an image forming apparatus includes a photoreceptor, a charging member, an application unit, and a control unit. An image is formed on the photoreceptor. The charging member is in contact with or close to a surface of the photoreceptor. The application unit applies a voltage to the charging member. The control unit performs control so that a current flowing through the charging member and the photoreceptor becomes a constant current when the photoreceptor is in an unused state, measures a voltage when the constant current flows and stores the measured voltage as a reference voltage, and controls the application unit to apply a voltage obtained by adding correction according to a value indicating a usage amount of the photoreceptor to the reference voltage.

Abstract: In one embodiment, a heating device to be used in a fixing device to fix a toner image to a medium has a heat pipe, a heater, and a heat conductive layer. The heater has a heating portion, and heats the medium via the heat pipe. The heat conductive layer is provided between the heating portion and the heat pipe, and conducts heat from the heating portion to the heat pipe.

Abstract: A developing device includes a housing having an opening in a wall thereof, a developing roller rotatably arranged within the housing, and a magnetic pole structure, wherein the developing roller is configured to carry a developer on an outer surface thereof using the magnetic force of the magnetic pole structure. The developing device further includes a gap forming member located within, and spaced from, the housing at a location downstream, in the rotation direction of the developing roller, of the opening in the wall of the housing, forming a first gap with respect to the developing roller and forming a second gap with respect to the housing, a blocking member arranged in the first gap, and a guide section configured to guide airflow passing through the second gap in a general direction toward the developing roller.

Abstract: A developing device includes first and second chambers, a developing roller, first and second mixers, and one or more removable seals. The developing roller is in the first chamber. The first mixer is in the first chamber and configured convey developer in a first direction along a rotational axis of the developing roller. The second chamber is connected to the first chamber via a first port and a second port that are spaced apart from each other in the first direction. The second mixer is in the second chamber and configured to convey developer in a second direction opposite to the first direction. The one or more removable seals cover the first and second ports. A developer is contained in one of the first or second chambers. A developer discharge port is provided on the other one of the first or second chambers.

Abstract: A developing device includes first and second chambers, a developing roller, first and second mixers, and one or more removable seals. The developing roller is in the first chamber. The first mixer is in the first chamber and configured convey developer in a first direction along a rotational axis of the developing roller. The second chamber is connected to the first chamber via a first port and a second port that are spaced apart from each other in in the first direction. The second mixer is in the second chamber and configured to perform convey developer in a second direction opposite to the first direction. The one or more removable seals cover the first and second ports. A developer is contained in one of the first or second chambers. A developer discharge port is provided on the other one of the first or second chambers.

Abstract: In accordance with an embodiment, an image forming apparatus comprises a first cassette configured to accommodate a first sheet; a second cassette configured to accommodate a second sheet different from the first sheet in at least one of a size and an orientation; a controller configured to perform control to feed the first sheet to a conveyance path from the first cassette and feed the second sheet to the conveyance path from the second cassette to insert the second sheet between respective copies if a printing instruction for a plurality of copies is issued; and a sheet discharge section configured to stack the first sheet and the second sheet.

Abstract: In accordance with an embodiment, an image forming apparatus comprises a first cassette configured to accommodate a first sheet; a second cassette configured to accommodate a second sheet different from the first sheet in at least one of a size and an orientation; a controller configured to perform control to feed the first sheet to a conveyance path from the first cassette and feed the second sheet to the conveyance path from the second cassette to insert the second sheet between respective copies if a printing instruction for a plurality of copies is issued; and a sheet discharge section configured to stack the first sheet and the second sheet.

Abstract: A developing device includes a housing having an opening in a wall, a developing roller having a hollow interior portion, a magnetic pole structure disposed within the hollow interior portion of the roller, a gap forming member, and a blocking member. The gap forming member is located within, and spaced from, the housing at a location downstream, in the rotation direction of the developing roller, of the opening in the wall of the housing, forms a first gap with respect to the developing roller and forms a second gap with respect to the housing. The gap forming member has a first side facing the opening in the wall of the housing and a second side spaced inwardly of the housing, from the first wall. The blocking member is located in the first gap and at one of the first and second sides of the gap forming member.

Abstract: In one embodiment, a heating device to be used in a fixing device to fix a toner image to a medium has a heat pipe, a heater, and a heat conductive layer. The heater has a heating portion, and heats the medium via the heat pipe. The heat conductive layer is provided between the heating portion and the heat pipe, and conducts heat from the heating portion to the heat pipe.

Abstract: A developing device includes a housing having an opening in a wall thereof, a developing roller rotatably arranged within the housing, and a magnetic pole structure, wherein the developing roller is configured to carry a developer on an outer surface thereof using the magnetic force of the magnetic pole structure. The developing device further includes a gap forming member located within, and spaced from, the housing at a location downstream, in the rotation direction of the developing roller, of the opening in the wall of the housing, forming a first gap with respect to the developing roller and forming a second gap with respect to the housing, a blocking member arranged in the first gap, and a guide section configured to guide airflow passing through the second gap in a general direction toward the developing roller.

Abstract: A developing device includes a housing having an opening in a wall thereof, a developing roller rotatably arranged within the housing, and a magnetic pole structure, wherein the developing roller is configured to carry a developer on an outer surface thereof using the magnetic force of the magnetic pole structure. The developing device further includes a gap forming member located within, and spaced from, the housing at a location downstream, in the rotation direction of the developing roller, of the opening in the wall of the housing, forming a first gap with respect to the developing roller and forming a second gap with respect to the housing, a blocking member arranged in the first gap, and a guide section configured to guide airflow passing through the second gap in a general direction toward the developing roller.

Abstract: An image forming apparatus of an exemplary embodiment includes a temperature sensor, a developing unit, a supply unit, and a control unit. The temperature sensor detects a temperature. The developing unit supplies developer to an image carrier and performs development. The supply unit contains developer and supplies the contained developer to the developing unit. The control unit executes developer replacement processing including discharging the developer from the developing unit and supplying the developer contained in the supply unit to the developing unit based on a first ratio which a ratio of a developer supply time during which the supply unit performs supply of the developer for the developing unit and a drive time during which the developing unit is driven and a threshold value obtained based on a detected temperature of a temperature sensor.

Abstract: In one embodiment, a heating device to be used in a fixing device to fix a toner image to a medium has a heat pipe, a heater, and a heat conductive layer. The heater has a heating portion, and heats the medium via the heat pipe. The heat conductive layer is provided between the heating portion and the heat pipe, and conducts heat from the heating portion to the heat pipe.

Abstract: A developing device includes a housing having an opening in a wall thereof, a developing roller rotatably arranged within the housing, and a magnetic pole structure, wherein the developing roller is configured to carry a developer on an outer surface thereof using the magnetic force of the magnetic pole structure. The developing device further includes a gap forming member located within, and spaced from, the housing at a location downstream, in the rotation direction of the developing roller, of the opening in the wall of the housing, forming a first gap with respect to the developing roller and forming a second gap with respect to the housing, a blocking member arranged in the first gap, and a guide section configured to guide airflow passing through the second gap in a general direction toward the developing roller.

Abstract: A developing device includes a housing having an opening in a wall thereof, a hollow developing roller, a magnetic pole structure disposed within the developing roller and at least a portion thereof facing the opening in the housing, a gap forming member located within the housing at a location downstream the opening in the housing and forming a first gap with the developing roller and forming a second gap with the housing, and a blocking member arranged in the first gap. The housing and the gap forming member form a first opening and a second opening spaced from the first opening across the second gap between the gap forming member and the housing, such that the first opening is farther from the opening in the wall of the housing than the second opening, and the width of the first opening is larger than that of the second opening.

Abstract: A developing device includes a housing having an opening in a wall thereof, a developing roller having a hollow interior portion, a magnetic pole structure disposed within the hollow interior portion of the roller, a gap forming member, and a blocking member. The gap forming member is located within, and spaced from, the housing at a location downstream, in the rotation direction of the developing roller, of the opening in the wall of the housing, forms a first gap with respect to the developing roller and forms a second gap with respect to the housing, the gap forming member having a first side facing the opening in the wall of the housing and a second side spaced inwardly of the housing, from the first wall. The blocking member is located in the first gap and at one of the first and second sides of the gap forming member.

Abstract: A developing device includes a housing having an opening in a wall thereof, a developing roller rotatably arranged within the housing, and a magnetic pole structure, wherein the developing roller is configured to carry a developer on an outer surface thereof using the magnetic force of the magnetic pole structure. The developing device further includes a gap forming member located within, and spaced from, the housing at a location downstream, in the rotation direction of the developing roller, of the opening in the wall of the housing, forming a first gap with respect to the developing roller and forming a second gap with respect to the housing, a blocking member arranged in the first gap, and a guide section configured to guide airflow passing through the second gap in a general direction toward the developing roller.

Abstract: The image forming apparatus of the present embodiment has two limiters composed of a conventional high order limiter and a low order limiter, and carries out control to switch the limiter according to a temperature and a humidity so as not to reach a image contrast potential equal to or greater than those limiters. Carrier development can occur if image formation is performed in a state where the image contrast potential is high. Therefore, by providing a low order limiter as in the present embodiment and carrying out control so as not to exceed the low order limiter at the time of the image formation, an occurrence of the carrier development can be suppressed, and an image density can also be within a prescribed range.

Abstract: An image forming apparatus of an exemplary embodiment includes a temperature sensor, a developing unit, a supply unit, and a control unit. The temperature sensor detects a temperature. The developing unit supplies developer to an image carrier and performs development. The supply unit contains developer and supplies the contained developer to the developing unit. The control unit executes developer replacement processing including discharging the developer from the developing unit and supplying the developer contained in the supply unit to the developing unit based on a first ratio which a ratio of a developer supply time during which the supply unit performs supply of the developer for the developing unit and a drive time during which the developing unit is driven and a threshold value obtained based on a detected temperature of a temperature sensor.