Abstract: A humidity detecting device includes a humidity sensor, which detects humidity using a change in an impedance by humidity, and which generates a humidity detection signal according to application of an AC voltage, a detecting unit that detects the impedance of the humidity sensor based on the humidity detection signal, a switching unit that switches a frequency of the AC voltage to at least a first frequency and a second frequency, the humidity sensor being a first impedance at the first frequency and a second impedance at the second frequency, a temperature sensor that detects ambient temperature of the humidity sensor, a calculating unit that calculates a difference and/or a change rate between the first impedance and the second impedance, a discriminating unit that discriminates the humidity sensor based on the difference and/or the change rate, and a control unit that performs processing corresponding to the discriminated humidity sensor.

Abstract: To control a cooling fan to cool a fusing unit of an image forming apparatus, it is determined whether the fusing unit is turned on or off. If the fusing unit is determined to be turned on or off, it is determined whether a condition to turn the cooling fan on or off is satisfied. If the cooling fan on/off condition is satisfied, the cooling fan is turned on or off. Thus, the driving of the cooling fan is minimized when the driving of the cooling fan is unnecessary so that the cooling fan is driven at a high efficiency.

Abstract: The image forming apparatus transfers a toner image onto a print paper via a transfer roller having an electrode configured to apply a bias electric potential upon the print paper. The image forming apparatus includes a humidity detection sensor to detect a humidity of the print paper, a retention electrode to preserve the toner image transferred to the print paper by applying a bias electric potential upon the print paper and a control device configured to control the bias electric potential of each of the electrode of the transfer roller and the retention electrode. The control device measures moisture content quantity of the print paper based on an interval from commencement of variation in the humidity to a maximum quantity of variation of the humidity and controls the bias electric potential of the electrode of the transfer roller and the retention electrode according to the moisture content quantity thus measured.

Abstract: An electrographic image forming device may use a feedback loop to determine environmental conditions and accordingly set one or more operating parameters. The device may detect a resistance/capacitance characteristic of a feedback loop comprising an interface between a first component and a second component of an image forming unit. The device may detect temperature measurements and humidity measurements that can be used to calculate wet-bulb temperature or other metrics used to characterize ambient environmental conditions. The interface may be one in which a toner image is transferred during image forming device operation. A controller may adjust the resistance/capacitance characteristic in response to wet-bulb temperature in conjunction with measured transfer feedback voltage.

Abstract: Systems and methods apply active feedback via a repetitive controller to compensate for periodic disturbances applied by recording media to a movable image carrier having a controlled velocity. The compensation parameters of the repetitive controller, once the error signal of the feedback converges to zero, can be stored with one or more characteristics of the print job or the recording media used for the print job. When other print jobs are received having the same one or more characteristics, the stored, converged compensation parameters can be retrieved, reducing the time to convergence of the systems and methods.

Abstract: An image forming apparatus includes: an image carrier on which an electrostatic latent image is formed; a developer carrier being in contact with the image carrier and configured to develop the electrostatic latent image on the image carrier with a developer; a temperature humidity measurement unit configured to measure the temperature and humidity around the developer carrier; a pressure changing mechanism configured to change a pressure of a contact between the image carrier and the developer carrier; and a pressure controller operable to change, based on the temperature and humidity measured by the temperature humidity measurement unit, the pressure by controlling the pressure changing mechanism.

Abstract: An image formation apparatus may compensate for potential printing irregularities caused by creasing of a print medium by detecting a humidity and determining whether the humidity is equal or above a specified threshold. If so, the image formation apparatus may increase a size of an area in which no image is to be formed at a trailing end of side of the print medium on which an image is to be formed. Increasing the size of the non-image area may include shifting an image formation area (e.g., where the image is to be formed) toward a leading end of the print medium and/or scaling the image and the image formation area to be smaller.

Abstract: An image forming apparatus includes a rotatable photosensitive member; a charging member for electrically charging the photosensitive member; a power source for applying a DC voltage to the charging member; an irradiation member for irradiating with light a surface of the photosensitive member; and a controller for controlling the irradiation of the light by the irradiation member. The photosensitive member is movable at a first speed and a second speed slower than the first speed. The irradiation of the light by the irradiation member is effected when the photosensitive member is moved at the first speed to effect image formation, and is not effected when the photosensitive member is moved at the second speed to effect the image formation.

Abstract: An image forming apparatus includes an intermediary transfer member having an elastic layer; a toner image forming portion for forming a toner image for an image to be carried on the intermediary transfer member; a transfer member, which presses the intermediary transfer member, for transferring the toner image for the image from the intermediary transfer member onto a recording material; a pressing mechanism capable of changing pressure applied from the transfer member to the intermediary transfer member; and a controller for controlling the toner image forming portion so that a length of the toner image for the image on the intermediary transfer member with respect to a rotational direction of the intermediary transfer member is decreased with an increase of the pressure.

Abstract: A sheet measuring apparatus includes a first rotating member including a first peripheral surface portion that contacts a transported sheet; a second rotating member including a second peripheral surface portion that contacts the first peripheral surface portion; a first rotation amount detecting unit that detects a first rotation amount of the first rotating member; a second rotation amount detecting unit that detects a second rotation amount of the second rotating member; a sheet calculation unit that obtains a first rotating member correction value for correcting an error that is superposed on the second rotation amount due to a radius distribution of the first rotating member and that performs calculation related to the transported sheet; a radius distribution calculating unit that calculates a new radius distribution of the first rotating member; and an updating unit that updates the first rotating member correction value to a new first rotating member correction value.

Abstract: An image forming apparatus includes an image bearing member for carrying an electrostatic latent image; a developing device, containing a developer including a toner and a carrier, for developing the electrostatic latent image carried on the image bearing member into a toner image with the developer; a supplying device for supplying the toner to the developing device; a first detecting portion for detecting information on a temperature of the developing device; a second detecting portion for detecting information on a temperature of the supplying device; and a correcting portion for correcting, when detection results of the first and second detecting portions are different from each other, an image forming condition with increase of a supply amount of the supplying device.

Abstract: An image forming apparatus which makes it possible to save energy during the operation of a temperature rise control mode, and is capable of realizing energy saving without degrading performance by making the image forming apparatus ready for printing when returning from the temperature rise control mode. A temperature sensor detects internal temperature of the image forming apparatus. When the internal temperature of the image forming apparatus has reached a temperature at which the apparatus should shift to the temperature rise control mode during execution of printing, the printing operation is stopped. In stopping the printing operation, the image forming apparatus is shifted to an energy saving mode.

Abstract: An image forming apparatus which makes it possible to prevent interruption of printing due to shift to a temperature rise control mode and interruption of printing for execution of a cartridge replacement operation due to running-out of toner from occurring separately during execution of continuous printing. A temperature sensor detects that the internal temperature of the image forming apparatus has become equal to or higher than a predetermined temperature. The image forming apparatus also detects execution of toner cartridge replacement. When the temperature sensor detects, during execution of printing, that the internal temperature has become equal to or higher than the predetermined temperature, the image forming apparatus stops the printing being executed. Further, when execution of toner cartridge replacement is detected during suspension of the printing, the image forming apparatus resumes the printing being suspended.

Abstract: An image forming apparatus includes a controller, a database, an image carrier, a transfer unit, a fixing device including a temperature detector and a first drive device, a speed changer, and an electric-current detector. The controller calculates a toner adhesion amount of a recording medium, identifies a type of the recording medium, detects a temperature of the fixing device, determines a moisture content of the recording medium, calculates a reaction force of the recording medium, calculates a toner adhesion force, compares the reaction force and the toner adhesion force, determines a fixing nip angle, drives the first drive device to set the fixing device to the fixing nip angle, determines a target feed speed of the recording medium, and drives the speed changer to change a feed speed of the recording medium to match the target speed.

Abstract: An electrostatic charging apparatus, includes: an endless-shaped electrostatic charging belt having electrical conductivity, the electrostatic charging belt being arranged in a state of having a predetermined contact zone being in contact with a moving to-be-charged body and moving in the same direction as a moving direction of the to-be-charged body; and plural electrode members including at least a first electrode member and a second electrode member, the plural electrode members being provided inside the electrostatic charging belt, and the first and second electrode members being provided on both sides of the contact zone of the electrostatic charging belt in the moving direction thereof so as to press the electrostatic charging belt against the to-be-charged body and forming gaps that permit electric discharge between the to-be-charged body and the electrostatic charging belt, the gaps being adjacent to the respective sides of the contact zone of the electrostatic charging belt.

Abstract: A fixing device includes a fixing belt; a pressing rotary body disposed outside a loop formed by the fixing belt; a nip formation pad disposed inside the loop formed by the fixing belt and pressed against the pressing rotary body via the fixing belt to form a fixing nip between the pressing rotary body and the fixing belt through which a recording medium bearing a toner image is conveyed. The nip formation pad includes a protrusion disposed downstream from the fixing nip in a conveyance direction of the recording medium and protruding toward the pressing rotary body without contacting the pressing rotary body. The fixing device further includes a pressing rotary body mover to contact and move the pressing rotary body bidirectionally in the conveyance direction of the recording medium to move the fixing nip toward and away from the protrusion.

Abstract: An image forming apparatus includes: a photosensitive member that is configured to carry a developer image; a developing roller that is configured to supply developer to the photosensitive member; a transfer member that is configured to transfer the developer image carried on the photosensitive member to a transfer medium; and a control unit that is configured to execute a collection mode upon receiving a printing instruction for executing a printing operation but before initiating the printing operation, wherein the control unit in the collection mode is configured to: discharge the developer of one or more circumferences of the developing which has been carried on the developing roller, to the photosensitive member; and collect the discharged developer by the developing oiler.

Abstract: An image forming apparatus includes: a detected member of which a temperature is to be detected; a temperature sensor including a contact portion provided to contact the detected member, the temperature sensor being configured to detect the temperature of the detected member; and a condition determining unit. The condition determining unit is configured to control electric power supplied to the temperature sensor such that the temperature sensor self-heats during a heating time period, and determine a condition of the contact portion based on the temperature detected by the temperature sensor after the temperature sensor starts self-heating.

Abstract: An image forming device includes an imaging apparatus configured to form an image according to image data and to maintain information associated with performance of the imaging apparatus, a replaceable member that is mounted in the imaging apparatus and used for forming an image, a consumed amount calculation unit configured to calculate a usage value of the replaceable member, and a notification control unit configured to control a replacement notification. Wherein the notification control unit controls a timing of the replacement notification based on the usage value calculated by the consumed amount calculation unit and the information associated with performance of the imaging apparatus.

Abstract: A charging device includes: a charging member; a charging power source that applies a charging voltage to the charging member; a temperature dependence storage unit that stores preset temperature dependence; a humidity dependence storage unit that stores preset humidity dependence; an ambient temperature detecting unit that detects an ambient temperature in the vicinity of the charging member; an ambient humidity detecting unit that detects an ambient humidity in the vicinity of the charging member; and a charging voltage control unit that applies the charging voltage to the charging member according to (i) a constant current value that is determined according to the temperature dependence as corresponding to the detected ambient temperature or (ii) a constant current value that is determined according to the humidity dependence as corresponding to the detected ambient temperature and the detected ambient humidity.

Abstract: An image forming apparatus includes a bias controller that controls a first application unit that applies a bias to a transfer member. The bias controller applies a reverse bias to the transfer member when a first region passes through a nip part. Then, when a second region passes through the nip part, the bias controller applies a fixed first forward bias to the transfer member. When a third region passes through the nip part, in order to implement the control the bias controller applies a variable second forward bias to the transfer member. The first forward bias is set at a predetermined value or above and increases a potential of the transfer member 46 to a level at which a toner image is transferred in the second region when the second region passes through the nip part.

Abstract: An out-of-color registration table containing a correspondence of amounts of out-of-color registration detected by an out-of-color-registration amount detector and machine states detected by a machine state detector is prepared. The out-of-color registration table is updated when there is a change in the current machine state.

Abstract: An image forming apparatus and a control method thereof to improve quality of an image in consideration of a change in posture of a print media. The image forming apparatus can include a transferred unit on which a visible image is formed, a transferring unit to form a transfer region through which the visible image is transferred onto a print medium, along with the transferred unit, a bias supplying unit to supply bias to the transferring unit so that a transfer electric field is produced in the transfer region, and a controller to control the bias supplying unit to supply different first to third biases to the transferring unit while at least first to third regions of the print medium pass through the transfer region, respectively.

Abstract: An information processing apparatus that can be connected to an image-forming apparatus, a method, and a program used for the information processing apparatus are disclosed. The information processing apparatus comprises a control unit for controlling print-setting information set for document data to be printed, a recognition unit for recognizing information about a first function specified by the print-setting information by translating the print-setting information controlled by the control unit, an obtaining unit for obtaining information about a second function of the image-forming apparatus connected to the information processing apparatus, a determination unit for determining whether or not the image-forming apparatus can perform the first function recognized by the recognition unit based on the second-function information obtained by the obtaining unit, and a modification unit for modifying the print-setting information controlled by the control unit based on the determination result.

Abstract: To provide new image forming apparatus and a printing method that can obtain information on image forming by using terahertz waves. An image forming apparatus includes a stock unit for stocking a media stack made of a plurality of media with images formed on; an electromagnetic wave generation unit for generating a terahertz wave to radiate on the media stack; an electromagnetic wave detection unit for detecting the terahertz wave propagated in a laminating direction of the media stack; a memory unit for storing reference data; a processing unit for generating data related to an image forming state from the detection signal from the electromagnetic wave detection unit, information on the number of sheets of the medium, and information on the image formed on the medium; and a comparative unit for comparing the data generated by the processing unit and the reference data stored in the memory unit.

Abstract: An image forming apparatus includes an image forming device, a time detection unit, a humidity measurement unit and a controller. The image forming device includes a photoconductive body, a developing device and a transfer device. The time detection unit detects information concerning a stop time period of the developing device. The humidity measurement unit is provided in a casing in which the image forming device is provided and measures a humidity. The controller controls a developer supply member in the developing device based on the information concerning the stop time period detected by the time detection unit and information concerning the humidity measured by the humidity measurement unit, so as to rotate at a lower speed than a rotation speed at a normal time before the developing device starts a first developing operation after the developing device stopped.

Abstract: A toner image is formed on an image carrier using a toner supplied from a developing roller to which a controlled bias voltage is applied; the toner image is primarily transferred onto an intermediate transfer member; the toner image is secondarily transferred onto a recording sheet using a transfer voltage applied to the secondary transfer roller; and the bias voltage is applied to the secondary transfer roller as a cleaning voltage necessary for cleaning the secondary transfer roller; and the toner adhered to a circumferential surface of the secondary transfer roller is reversely transferred onto the intermediate transfer member.

Abstract: An image forming apparatus comprises: a pair of first sheet ejecting rollers and a pair of second sheet ejecting rollers that eject a sheet on which an image is formed; a guide member that guides the sheet to the pair of first sheet ejecting rollers or the pair of second sheet ejecting rollers; a controller that performs control so that, while a sheet that is to be ejected by the pair of first sheet ejecting rollers onto an ejected-sheet tray is being held by the pair of first sheet ejecting rollers in a stopped state, the pair of second sheet ejecting rollers is in a stopped state and hold an immediately subsequent sheet above the ejected-sheet tray; and a fan that moves air toward the sheet held by the pair of first sheet ejecting rollers and the immediately subsequent sheet held by the pair of second sheet ejecting rollers.

Abstract: An image forming apparatus includes an image bearing member for bearing a image; a developing container for accommodating a developer comprising toner and carrier; a rotatable developer carrying member, provided in an opening of the developing container, for developing an electrostatic latent image formed on the image bearing member; a feeding device for feeding the developer in the developing container toward the developer carrying member; detecting device for detecting information relating to a consumption amount of the developer; and a controller for executing, when a image formation is continuously effected for a plurality of recording materials, a operation in a mode in which on the basis of a result of detection of the detecting device, the image forming operation is interrupted, and a operating condition of at least one of the feeding device and the developer carrying member is changed.

Abstract: The image forming apparatus calculates a total length of a blank region in which toner is not moved with respect to the length of the recording material in a direction perpendicular to the direction of conveying the recording material P. When the toner image on the intermediate transfer belt is transferred to the recording material P in the secondary transfer unit and the total length of the blank region without the toner image is greater than a preset first reference value, a voltage supplied to a secondary transfer roller is corrected such that the voltage has the same polarity as the preset reference voltage according to the first reference value and the absolute value is greater than the absolute value of the reference voltage.

Abstract: A sheet conveying device that conveys a sheet discharged from an image forming apparatus. The sheet conveying device includes an air intake fan that takes in external air; an air exhaust fan that discharges internal air; a plurality of branched conveying paths which are branched from a conveying path within a range from a sheet entrance to a sheet exit and for which a passing time of the sheet is approximately the same; a conveyance motor that independently conveys the sheet to each one of the branched conveying paths; a conveying path switching unit that switches among the branched conveying paths; and a conveying path control unit that causes the conveying path switching unit to sequentially switch among the branched conveying paths every time the sheet is input from the image forming apparatus.

Abstract: An image forming apparatus according to the embodiments includes a photoconductor, a charging unit which charges the photoconductor and is disposed to face the photoconductor in a non-contact manner, a positioning portion which changes a gap interposed between the photoconductor and the charging unit, on the basis of at least the temperature.

Abstract: An image forming apparatus, including: a fixing device configured to fix a toner image onto a sheet by heating the sheet having the toner image formed thereon; a wire-shaped guide configured to guide the sheet having the toner image fixed thereto; and a holder, configured to hold the wire-shaped guide, to which the wire-shaped guide is fixed by using elasticity of the wire-shaped guide.

Abstract: In an embodiment, a contact pivoting plate, which comes into contact with a developer swelled by a discharge mixer, is provided in a case. The contact pivoting plate is pivoted according to a detection result of a temperature and humidity sensor to change the magnitude of resistance by the contact pivoting plate with respect to a flow of the developer. The height of the swell of the developer is suppressed from fluctuating according to an environmental change. The fluctuation in an amount of an excess developer discharged from a discharge port is suppressed to replace a deteriorated carrier in a development container with a new carrier little by little.

Abstract: An image forming apparatus includes a contact transfer device, a bias applying device, a transfer current sensor, a leakage current adjustor, and a controller. The contact transfer device is configured to transfer a toner image onto a surface of a sheet conveyed in a predetermined direction. The bias applying device is configured to apply a bias to the contact transfer device. The transfer current sensor is configured to sense a value of a transfer current flowing through the sheet at an image transfer position. The leakage current adjustor is configured to adjust an amount of a leakage current flowing from the contact transfer device along the surface of the sheet. The controller is configured to control the leakage current adjustor to maintain an amount of the transfer current within a reference range based on the value of the transfer current sensed by the transfer current sensor.

Abstract: An image forming apparatus includes a counting unit that, when a driving unit for rotating an image carrier is operating, adds a predetermined first count value to a total count value in a predetermined timing and that, when the driving unit is being stopped, subtracts a predetermined second count value from the total count value in every predetermined timing; and a suspending unit that suspends printing when the total count value becomes equal to or larger than a preset suspend value.

Abstract: A system for tailoring a transfer nip electric field includes a transfer roll, a backup roll forming a transfer nip with the transfer roll, and a pre-nip roll positioned upstream from the transfer and backup rolls and the transfer nip such that a toner image-supporting transfer belt moving past the pre-nip, transfer and backup rolls separately makes contact with, wraps partially around, and rotates each of the rolls as a media sheet is fed into the transfer nip after first passing through a gap defined between the pre-nip and transfer rolls such that by presetting the position, geometry and charge of the pre-nip roll relative to the transfer and backup rolls and the transfer belt an electrical field at the transfer nip can be tailored for enhanced toner transfer from the transfer belt to the media sheet.

Abstract: In an image forming apparatus, when no image is being formed, an image bearing member is rotated at least one rotation, in a state in which a transfer bias is controlled such that a potential on a surface of the image bearing member on the upstream side in the rotational direction of a cleaning apparatus is a polarity opposite to that of a developer.

Abstract: An image forming apparatus includes: an image information input section into which image information is input, and image holding members by which toner images of two or more colors including black and clear colors are held, respectively. The image forming apparatus further includes a transfer-receiving material to which toner of all colors are transferred from their respective image holding members, an image-area pinpointing section wherein an area of clear toner image to be superposed on a linear image region to be formed with toner of the black color is pinpointed in the image information input into the image information input section, and an image processing section wherein is performed replacement processing that at least part of black image on the pinpointed image area is formed with a hybrid of two or more kinds of colored toner instead of black toner.

Abstract: An image forming apparatus includes a rotatable image bearing member including an electroconductive base member and a photosensitive member formed on the electroconductive base member; a contact charging device for electrically charging the photosensitive member; a DC voltage applying device for applying a DC voltage to the contact charging device; an exposure device for exposing the charged photosensitive member to light; and a current detecting device for detecting a current passing from the contact charging device to the electroconductive base member of the image bearing member.

Abstract: An image forming apparatus includes an image bearing member; an image forming portion for forming a toner image on the image bearing member, the image forming portion being capable of forming an image to be formed on a recording material and forming a control image for controlling an image density at a position adjacent to the image to be formed on the recording material; an intermediary transfer member rotatable while carrying the toner image transferred from the image bearing member; a transfer member for forming a transfer portion where the toner image is to be transferred from the intermediary transfer member onto the recording material; an electrostatic cleaning member for electrostatically removing the toner deposited on the transfer member; a density detecting portion, provided upstream of the transfer member with respect to a rotational direction of the intermediary transfer member, for detecting a density of the control image transferred on the intermediary transfer member; an adjusting portion for a

Abstract: Disclosed are printing methods, apparatus and systems for developing a latent image recorded on a surface, for example, a photoreceptor with developer material. According to an exemplary embodiment, the development method applies a development field voltage between a development station donor member and a development station transport member as a function of a humidity measurement associated with the developer material, the humidity measurement providing a surrogate tribo measurement of the developer material.

Abstract: A determining unit determines whether a difference between a temperature value and a temperature detected by a temperature detecting unit is equal to or larger than a first value. A pattern forming unit, when the determining unit determines that the difference is equal to or larger than the first value, forms a pattern for measurement including sub-patterns of a plurality of colors on a transfer medium. A calculating unit calculates a misregistration-amount for each sub-pattern based on a detected position of the sub-pattern and a predetermined position of the sub-pattern. A correcting unit corrects a position on which the sub-pattern is to be formed based on the misregistration-amount. An image forming unit forms an image for each color factoring in corrected position for each color.

Abstract: An image forming apparatus is provided which is of an electrophotographic type, and is capable of setting a gradation number of a patch pattern to be formed corresponding to various factor information, and to perform a process control. The image forming apparatus includes a patch pattern forming part to form a toner image of a patch pattern on an image carrier; a developing part to develop the patch pattern; a toner image density detecting part to measure a toner image density of the patch pattern; and a process control performing part to vary an image forming process condition based on detection results obtained from the toner image density detecting part, and to stabilize an image density.

Abstract: An image forming apparatus that transfers a toner image from includes a transfer belt to a sheet via to carry a toner image, a transfer roller. The image forming apparatus transfers the toner image by applying a transfer bias voltage to either the transfer roller or to make contact with the transfer belt to transfer the toner image onto a sheet from the transfer belt, an opposite roller facing the transfer roller across the transfer belt. The transfer bias voltage is decided by adding a transfer roller correction voltage, based on a voltage detected by a voltage detection unit when a predetermined current is applied to either the transfer roller or the opposite roller by a current application unit when no sheet is present in a transfer position, and a sheet correction voltage, based on a sheet kind and an intra-apparatus humidity.

Abstract: An image forming apparatus includes a plurality of image forming units each having an image supporting member, a developer supporting member, and a cleaning member for cleaning developer on the image supporting member. The image forming apparatus further includes a transfer device for transferring a developer image to a medium; a fixing device for fixing the developer image to the medium; a first detection unit for detecting a first physical value of an external environment of the image forming apparatus; a second detection unit for detecting a second physical value of an internal environment of the image forming apparatus; and a control unit for determining whether at least one of the image forming units performs a developer discard mode in which developer is discarded according to the first physical value, the second physical value, and a distance between the one of the image forming units and the fixing device.

Abstract: An image forming apparatus may include an image forming unit, a stacking unit, a control unit, and an alignment unit. The image forming unit forms an image on a recording material having a type. The stacking unit stacks the recording material on which the image formation is formed by the image forming unit. The control unit sets a predetermined number of sheets to a number that corresponds to the type of the recording material. The alignment unit aligns the recording material if the predetermined number of sheets of the recording material is stacked by the stacking unit.

Abstract: An image forming apparatus includes a transfer bias set up section and a developing bias set up section. The transfer bias set up section sets a transfer bias applied to each transfer member so that the transfer bias applied to a transfer member corresponding to a photosensitive member on the most downstream side is greater than a transfer bias applied to a transfer member other than this transfer member. The developing bias set up section sets a developing bias applied to each developing member to a first developing bias in a single-side printing mode, and sets up the developing bias applied to each developing member in formation of an image on a first surface and in formation of another image on a second surface to a second developing bias lower than the first developing bias when the image formed on the second surface is a color image.

Abstract: An image forming apparatus comprising: an image carrier to carry a toner image; a driving unit to drive the image carrier to rotate; a transfer unit to transfer the toner image at a transfer position; a cleaner at a cleaning position to remove toner remaining on the image carrier after transfer; an obtaining unit to obtain information indicating a likelihood of the remaining toner adhering to the image carrier; a judging unit to judge whether or not the likelihood is equal to or lower than a predetermined value; and a controller to control the driving unit (i) to stop driving the image carrier before a rear end of an area of the image carrier on which the toner remains reaches the cleaning position, when the judging unit judges affirmatively, and, (ii) to stop driving the image carrier after the cleaner removes the remaining toner, when the judging unit judges negatively.

Abstract: Certain embodiments provide an image forming apparatus including: an image carrier; a latent image forming unit; a developing unit; a fixing unit; a toner cartridge; a battery in the toner cartridge; a temperature sensor in the toner cartridge driven by the battery; a first controller which causes the temperature sensor to measure an ambient temperature periodically in the toner cartridge and be supplied with power from the battery; a recording medium which is provided in the toner cartridge and records a result of measurement by the temperature sensor in timing controlled by the first controller; and a second controller which reads out information recorded in the recording medium, and changes an operating condition of the latent image forming unit, the developing unit and the fixing unit according to a state of preservation of the supply of toner, based on the information.