Abstract: An image forming apparatus includes an image bearing member; a developing device for accommodating a transport toner and a carrier; a transferring device for transferring a transparent toner image from the image bearing member onto a surface of a recording material; a heating device for heating the transparent toner image; a switching portion for switching between a first mode in which the transparent toner image is transferred onto the surface of the recording material having a fixed non-transparent toner image and a second mode having an unfixed non-transparent toner image or having no image; and a controller for controlling the developing device so that transfer of the carrier during the first mode is more suppressed than in the second mode.

Abstract: An image forming apparatus includes an image bearing member to bear a latent image on a surface thereof, a developing unit to develop the latent image on the image bearing member with toner, a driving unit to drive the developing device, a storage unit to store a cumulative travel distance of the developing roller at predetermined timing, a total travel distance of the developing unit, and control conditions for the developing unit, a controller to obtain a difference between the total travel distance of the developing roller and the cumulative travel distance up to a predetermined point in time in image forming operation and to instruct intermittent printing in which continuous printing is limited to a certain number of pages in a predetermined time period when the difference is equal to or greater than a threshold travel distance, and an operation unit in which the control conditions are set.

Abstract: An image forming apparatus is provided that reduces the occurrence of downtime in the case in which the interval between sheets needs to be expanded, and also suppresses the degradation of a photosensitive drum and a developing roller, when continuously forming images. The image forming apparatus of the present invention predicts the start timing of image formation onto the next printing material, and performs control of the positional relationship between the photosensitive drum and the developing roller without decreasing productivity, based on a result of the prediction. Further, the image forming apparatus performs control of the rotating operation of the photosensitive drum, based on the above prediction result.

Abstract: A development device is provided with: a development roller that rotates while carrying a two-component developer in a development tank accommodating the two-component developer; a tubular developer conveyance path having therein a conveyance mechanism that conveys the two-component developer in an axial direction of the development roller; a developer supply mouth for supplying the two-component developer to the developer conveyance path; a developer discharge mouth for discharging the two-component developer from the developer conveyance path; a supply mouth adjustment member that adjusts the area of the opening of the developer supply mouth; and a control unit that causes the supply mouth adjustment member to operate based on the fluidity of the two-component developer in the development tank.

Abstract: An image forming apparatus includes a developer containing part, a developer mixer, a mixer drive motor, a magnetic sleeve, a sleeve drive motor, a mixer rotation speed determination part and a motor drive controller. The developer containing part contains a two-component developer including a toner and a carrier. The developer mixer is provided in the developer containing part, agitates the two-component developer, and charges the toner and the carrier. The mixer rotation speed determination part determines the mixer rotation speed of the mixer drive motor according to a supply amount of the toner supplied to the developer containing part from a toner cartridge by driving of a toner supply motor. The motor drive controller independently performs rotation control of the sleeve drive motor and the mixer drive motor, and rotates and controls the mixer drive motor at the mixer rotation speed determined by the mixer rotation speed determination part.

Abstract: Certain embodiments provide an image forming apparatus including: a drum; a photoconductive member; a charging device; a developing device; a toner supplying section; a transfer member; a sensor to measure the density of a toner band adhering on the transfer member; a process control section to separately control on and off of a developing bias and on and off of a charging bias; a timing adjusting section to instruct the process control section to turn on the developing bias at timing when a portion not substantially charged on the photoconductive member is opposed to the developing device; and a calculating section to calculate an amount of supply of toner from the toner supplying section into the developing device according to a result of measurement of the density of the toner band which is formed by the developing bias enabled by the timing adjusting section by the sensor.

Abstract: Background development in a multi-color electrophotographic printer is reduced. A print job including a plurality of separations is received. Each separation has an image area and a non-image area. A printer is provided, including a development member for supplying toner to a photoreceptor for each separation. A developing and a non-developing zone are determined for each separation, corresponding to the image area and non-image area, respectively. Developer is automatically supplied to the development members, and automatically removed developer from the respective non-developing zone of each development member.

Abstract: An image forming apparatus includes an image forming unit including a developing device, a second toner cartridge replaced for a first toner cartridge storing a first toner having a first characteristic, stores a second toner having a second characteristic, and supplies the second toner to the developing device, a first memory provided in the second toner cartridge, and stores data of the second characteristic, a toner use amount detection mechanism to detect a toner use amount in the developing device after the replacement to the second toner cartridge, a second memory in which a first print condition as an optimum print condition obtained from data of the first characteristic, the second print condition and the toner use amount are written, and an arithmetic mechanism to obtain an execution print condition changed stepwise from the first print condition to the second print condition based on the toner use amount.

Abstract: An image forming apparatus including toner image forming means for forming a having chromatic toner image a transparent toner image; fixing means for heating and fixing the non-transparent toner image and the transparent toner image on recording material; glossiness detecting means for detecting a glossiness of an area in which the non-transparent toner image and the transparent toner image are overlaid and fixed; control means for controlling an amount of the transparent toner, per unit area, on the recording material on the basis of a result of detection by the detecting means.

Abstract: An image forming apparatus includes: an image formation control unit for forming print images on an image carrier and for forming a reference toner pattern having a predetermined size between the print images formed on the image carrier; a reference image density detecting unit for detecting a image density of the reference toner pattern; and an image forming condition adjusting unit for adjusting an image forming condition based on the image density detected by the reference image density detecting unit. If a toner amount of one or plurality of the print images is greater than a predetermined value, the image formation control unit prevents any further adjustment operation performed by the image forming condition adjusting unit.

Abstract: An image forming device has: an image forming body on which an image is formed in a state in which the image forming body is charged; a charging device having plural discharge portions, and charging the image forming body by discharging of plural discharge portions; and a control section that, when forming the image on the image forming body, operates the plural discharge portions, and when not forming the image on the image forming body, switches between a state of operating some of the plural discharge portions and decreasing output of or stopping the discharge portions other than the some discharge portions, and a state of operating some other of the plural discharge portions and decreasing output of or stopping the discharge portions other than the some other discharge portions.

Abstract: A development method according to an embodiment includes exposing a photosensitive film formed on a substrate at a predetermined exposure amount, carrying out a first development process that develops the exposed photosensitive film at a predetermined first development condition so as to leave the photosensitive film, obtaining a sensitivity information of the photosensitive film from a film thickness reduction of the photosensitive film developed by the first development process and the exposure amount, predicting pattern dimensions of multiple types of patterns to be formed when a second development process is carried out following the first development process from the sensitivity information, and determining a first acceptable range of a development condition in the second development process, determining a second acceptable range of the development condition in the second development process from the first acceptable range and a variation amount of the pattern dimension after the development process betw

Abstract: An image forming apparatus is provided that reduces the occurrence of downtime in the case in which the interval between sheets needs to be expanded, and also suppresses the degradation of a photosensitive drum and a developing roller, when continuously forming images. The image forming apparatus of the present invention predicts the start timing of image formation onto the next printing material, and performs control of the positional relationship between the photosensitive drum and the developing roller without decreasing productivity, based on a result of the prediction. Further, the image forming apparatus performs control of the rotating operation of the photosensitive drum, based on the above prediction result.

Abstract: A control part provides a first region in which an image is formed on an image carrier using only a dark-color toner. The control part provides a second region, which is adjacent to the first region, in which an image is formed using a dark-color toner and a light-color toner. The control part provides a third region in which an image is formed using only a light-color toner at the boundary of the first and second regions. The control part controls a latent-image forming unit, a light-color developing unit and a dark-color developing unit so as to form an image in which these regions are provided. The control part may provide a third region in which neither a light-color toner nor a dark-color toner is used at the boundary of the first and second regions.

Abstract: A method and apparatus transfer a material from first roller within a container to at least one second roller, and transfer the material from the second roller to at least one third roller. The second roller and the third roller form a loading nip at a location where the second roller is closest to the third roller. The method and apparatus transfer the material from the third roller to at least one recipient device, and measure current flow between the second roller and the third roller using a measurement device. Then, the method alters the relative rotation rate difference between the first roller and the second roller based on the current flow to maintain a predetermined density of the material at the loading nip using a controller.

Abstract: An image forming apparatus including: an image bearing member; and a developer bearing member bearing a developer including a toner and a carrier, the developer bearing member developing an electrostatic image formed on the image bearing member with the developer, and the developer bearing member being applied with an alternate voltage in order to form an alternate electric field between the developer bearing member and the image bearing member, wherein assuming that electric field intensities Eb and Ed be Eb=|(Vp1?VL)/D| and Ed=|(Vp2?VL)/D|, a relationship, 0?K1>K2, is satisfied, where K1: a gradient at Ed, and K2: a gradient at Eb, and wherein a resistivity ?b of the carrier at the electric field intensity Eb satisfies 1.1×106×en<?b<6.0×107 [?·m] (where: e is the base of natural logarithms; and n=4×Eb×10?7).

Abstract: A method for adjusting the gamuts of a set of printers to match the gamuts across a population of printers using mass targets. The method involves printing color patches suitably positioned in the color gamut with CMYK separations and simultaneously actuating DMA targets to the level 2 controls of the printers using closed loop control algorithms. An extreme MIMO control algorithm is used to converge to the desired L*a*b* targets by adjusting mass targets to the printing system in an iterative fashion to maximize the common intersection gamut across the printers.

Abstract: An image forming apparatus includes: an image holder on which a toner image is formed; a developing device which is filled with a toner including a lubricant, and forms the toner image by making the toner adhere to the image holder; a torque calculation section which calculates torque of a drive motor which drives the image holder; a cleaning section which cleans the image holder; and a control section which calculates a print rate of the toner image formed on the image holder, makes determination of an adhering lubricant amount of the lubricant adhering to the image holder based on the print rate and the torque, and changes a toner image of a toner forcibly-discharging-pattern according to the determination.

Abstract: An image forming apparatus and a control method thereof are disclosed. A charge unit charges a surface of an organic photo conductor (OPC) to a predetermined electric potential. A developing unit develops an electrostatic latent image formed on the surface of the OPC by coating a developer on the same. A power supply unit supplies power to the charge unit and the developing unit. A control unit regulates the power supplied to the charge unit and the developing unit. After a developing process in the developing unit, the control unit regulates the power applied to at least one of the charge unit and the developing unit so as to collect a residual developer on the surface of the OPC to the developing unit. Accordingly, contamination of the charge unit and the transfer unit can be prevented and an image of a good quality can be achieved.

Abstract: In a disclosed image forming apparatus, a developing bias applied to a developer carrier or exposure energy with which an image carrier is exposed is adjusted such that an isolated one-dot image on the image carrier has a predetermined image density. When the image carrier is exposed to form dot images continuously arranged in a main scanning direction, the exposure time period for each dot image is shorter than that when the image carrier is exposed to form the isolated one-dot image.

Abstract: An image forming apparatus includes an image forming portion for forming a toner image of color toner and transparent toner on a recording material; a heating device for heating the toner image formed on the recording material; an execution portion for executing a mode in which the transparent toner is partly placed in an image formable region of the recording material; and a control portion for controlling, on the basis of an amount of the color toner to be placed in an adjacent region adjacent to a region in which the transparent toner is to be placed, an amount of the transparent toner so that the amount of the transparent toner to be partly placed on the recording material when glossiness in the adjacent region is high is larger than that when the glossiness in the adjacent region is low.

Abstract: An image forming apparatus includes: an image forming unit that includes a developing unit with a developing roller to form an image using toner; a controller; and a detection unit that detects a plurality of toner patches formed at different densities on an image carrier by the image forming unit. The controller controls the image forming unit to form the toner patches on the image carrier so that each interval between the toner patches is equal to or greater than a length corresponding to a circumference length of the developing roller.

Abstract: An image forming apparatus, which has a plurality of image forming units, comprises a plurality of cartridges adapted to supply developer; a plurality of supply members adapted to supply developer to the image forming units from a plurality of the cartridges; a drive unit adapted to drive a plurality of the supply members; and a control unit adapted to supply developer from a plurality of the cartridges by selectively operating a plurality of the supply members based on the amount of developer accommodated in the cartridges.

Abstract: An image forming apparatus includes: an image bearing member; a development device; a speed varying unit that can vary a speed of a developer bearing member; a sensing portion that senses an environmental temperature around the development device; and a controller that can perform a mode in which, compared with a period which an image forming region of the image bearing member passes through the developing region, the rotation speed of the developer bearing member slows down a period which a non-image forming region of the image bearing member passes through the developing region, wherein based on sensing result of the sensing portion, the controller performs the mode when the environmental temperature is higher than a predetermined value, and the controller does not perform the mode when the environmental temperature is lower than the predetermined value.

Abstract: Provided is a deposited-toner measuring apparatus capable of accurate detection of the amount of toner deposited on the toner carrying member, and an image forming apparatus equipped with the aforementioned measuring apparatus and capable of controlling the amount of toner deposited on the toner carrying member to a desired level so as to provide stable image quality at all times. A deposited-toner measuring apparatus that removes a toner layer in a part of the surface of the toner carrying member, detects change in the capacitance at the portion with a toner layer and the portion without such a toner layer, and detects the amount of the deposited toner based on the detection result of the said change in the capacitance.

Abstract: A developing device includes: a plurality of developer retaining bodies that retain developer and rotate, and that respectively convey the developer, which is supplied to each of the developer retaining bodies from a developer supply section, to an image bearing body that rotates and bears a latent image; and a speed changing unit that is adapted to change a rotation speed of at least one of the developer retaining bodies excluding a developer retaining body that is furthest downstream side in a direction of rotation of the image bearing body.

Abstract: An image forming apparatus having an image carrier; an electrostatic latent image forming device that forms an electrostatic latent image on the image carrier; a development device having a housing section that stores toner therein, a stirring device for stirring the toner inside the housing section, and a toner, carrier that develops the electrostatic latent image into a toner image by imparting the toner to the image carrier; a voltage applying device that applies a development bias voltage between the image carrier and the toner carrier; a control device that makes the electrostatic latent image forming device and the development device form a test toner image on the image carrier; and a sensing device that senses a toner adhering amount of the test toner image.

Abstract: An image forming apparatus includes: a plurality of image forming units each with an image carrier on which an electrostatic latent image is formed, and each with a developing member for developing process on the electrostatic latent image, wherein the image forming apparatus superimposes toner images of the respective colors to form a composite color image; when images on a plurality of pages are formed, the developing members of the respective colors are started or stopped in response to presence or absence of latent images of the respective colors on a page that is targeted for image formation; and when the image forming unit starts to be driven, a developing member, corresponding to a color whose latent image is not to be formed on a first page of the plurality of pages, is not started.

Abstract: The present disclosure provides toners having a tunable gloss level, electrophotographic apparatuses for using such toners as well as processes for making such toners.

Abstract: This invention provides an image forming apparatus, which attains a uniform gloss level of an overall image by preventing regions having different gloss levels from being generated on the image to be formed upon execution of image formation using a transparent toner, and a control method thereof. To accomplish this, an image forming apparatus of this invention identifies pixels to be developed using only a black toner of colored toners from an image signal of an image to be formed on a printing material upon execution of image formation using the transparent toner. Furthermore, the image forming apparatus executes exposure control so as to perform development using the transparent toner in an amount required to reduce a gloss level difference between the pixels to be developed using only the black toner and those to be developed using the colored toners other than the black toner.

Abstract: There is provided an apparatus for developing a latent image recorded on an imaging surface, including: a housing defining a reservoir storing a supply of developer material comprising toner; a donor member positioned in the housing, spaced from the imaging surface, for transporting toner on an outer surface of the donor member to a region opposed from the imaging surface, a print quality system for monitoring a plurality of xerographic actuator parameters, the print quality system generating a feedback signal if at least one of a plurality of xerographic actuator parameters is beyond a predefined threshold limit; and system for translating the donor member from a first predefined spacing to a second predefined spacing from the imaging surface in response to the feedback signal from the print quality system.

Abstract: An image forming apparatus is provided with a control section which stores detection results of a toner sensor regarding detection patterns. When forming a plurality of detection patterns on an intermediate transfer belt, the control section determines circumference-directional lengths of the detection patterns formed this time, based on the detection results of the toner sensor regarding the detection patterns formed immediately before. Thereby, the waste toner amount and toner consumption are not only decreased but also the time taken to detect the density of a detection pattern is reduced, while maintaining the detecting accuracy thereof.

Abstract: A developing device that efficiently adjusts the amount of charge on the developing agent without being affected by external conditions, and that continuously supplies a developing agent with the appropriate toner concentration and amount of charge. An ionized air flow adjusts the amount of charge on the developing agent discharged from the developing unit to improve the dispersability of the replenished toner without applying unnecessary stress. The developing agent is raised upwards by a screw, downwards by an agitation member, and then gathered by a screw in a circulating flow. Consequently, the developing agent is uniformly mixed within the developing agent agitation unit. This circulating flow of the developing agent increases the probability of contact and reduces damage to the developing agent. When the ionized air flow reduces the amount of charge before agitation, the toner can be uniformly charged to the appropriate value.

Abstract: The image forming apparatus includes an image forming section that forms a non-margin image by forming, on an image bearing member, a toner image including an edge portion area (Ae) and an internal area (Ai), transferring the toner image formed on the image bearing member to the transfer material. On the toner image corresponding to the edge portion area, which is formed on the image bearing member, toner amount increase processing is performed, the toner amount increase processing including toner amount gradual increase processing of gradually increasing intensity of the toner amount increase processing from the inner side of the edge portion area toward an outer side thereof. The image forming section forms, on the image bearing member, the toner image subjected to the toner amount increase processing. Accordingly, fixing performance during non-margin printing is enhanced and a high-quality image is formed.

Abstract: A developer system and method for an electrographic printer is provided that provides a variable rate of developer flow to the photoconductor drum of the printer. The system includes a magnetic brush having a magnetic core surrounded by a toning shell that rotatably conveys a layer of developer to the photoconductor element; a sump containing a reservoir of developer, and a variable speed conveyor roller.

Abstract: A developing unit that includes a stirring roller stirring a developer and a developing roller and develops an electrostatic latent image formed on an image carrier to form a toner image; a drive source that rotationally drives the developing roller and the stirring roller; and a control unit that switches a rotational speed of the developing roller in modes of an image formation mode and an adjustment mode, and rotationally controls the stirring roller at a first speed in the modes are provided.

Abstract: A control unit is provided with an excitation current output section for outputting an excitation current to a stepping motor, a first level judging section for judging a drive stop time level indicating the duration of a time during which the stepping motor is not driven, a storage storing a plurality of starting torque values required to start driving the stepping motor and a plurality of drive stop time levels while relating them to each other, and a controller for obtaining the starting torque value corresponding to the drive stop time level judged by the first level judging section by referring to the storage, calculating an excitation current value which gives the obtained starting torque value and outputting an excitation current having the calculated excitation current value.

Abstract: A systems and methods for providing an image forming machine capable of monitoring the absolute charge to mass ratio of toner and dielectric thickness of a photoconductor layer on a photoconductor in an image forming device, and for providing warnings, alerts and process controls when the absolute charge to mass ratio of toner in an image forming device or the dielectric thickness of a photoconductor layer falls outside a predetermined range.

Abstract: The present invention provides a method and apparatus for forming an image. A controller manages a charger and a developing bias voltage to increase an absolute value of the charging voltage to an image-bearing member and an absolute value of a developing bias voltage to a developer-bearing member to predetermined values in a plurality of steps. The controller controls the developing bias voltage applied to the developer-bearing member; wherein the following relation holds in each of the plurality of steps: |VD|>|Vi|, where VD represents a developing bias voltage applied to the developer-bearing member and Vi represents a charged potential of the image-bearing member. This invention is especially useful for mono-component development using DC voltage as a development driving mechanism.

Abstract: An image forming apparatus includes: a developing unit forming a toner image on a photoreceptor drum; a photo sensor detecting the image density of the toner image; an operation unit calculating a relational equation between the measurement detected by the photo sensor and the development potential; a storage unit storing the relational equation; and a control unit setting up a corrected development potential to obtain a target image density for the developing unit, based on the image density of toner image patches. When high-density correction is performed, the control unit forms a multiple number of toner image patches on the photoreceptor drum based on the corrected development potential that was obtained at the time of the previous high-density correction, and sets up a corrected development potential for obtaining the target image density, based on the multiple image densities of the multiple toner image patches.

Abstract: A recording medium includes a first image that is read with infrared light and that is formed of plural dots having infrared absorptivity, part of the plural dots being invisible first dots, the remaining dots being visible second dots; and a visible second image that is formed of the second dots or the second dots and visible third dots not having infrared absorptivity.

Abstract: An image forming apparatus to form image data on a printing medium, the apparatus includes a developing cartridge having a developer transfer body to transfer developer to an image receptor, a developer storing unit to separately store a transfer-regulated developer which has been transfer-regulated in the developer transfer body and a non-transferred developer which is not transferred to the developer transfer body, and a used developer storing unit to store a used developer separated from a surface of the photoreceptor; a printing information storing unit to store cartridge printing information of the developing cartridge; and a controller to calculate an average printing density on a basis of the cartridge printing information, and to control the developing cartridge so that an amount in which the transfer-regulated developer of the developer storing unit is transferred to the used developer storing unit can exceed a reference amount if the calculated average printing density is below a reference printing

Abstract: There is provided a developer container, which is divided into a first containing part and a second containing part that are communicated with each other at communication parts on the opposite end sides, which has a discharge port at the second containing part, and in which a developer is contained; a developer carrying member that carries the developer within the developer container to adhere it to the image carrying member; a first conveyance member that conveys the developer in the first containing part of the developer container while agitating it; a second conveyance member that conveys the developer in the second containing part of the developer container while agitating it, and supplies the developer to the developer carrying member; a third conveyance member that is arranged between the second conveyance member and the discharge port; a first driving member that rotary-drives the first conveyance member and the second conveyance member; and a second driving member that drives the third driving member

Abstract: A developing device capable of improving the image density and the dot reproducibility, and an image forming apparatus including the same are provided. A developing device applies an alternating voltage superimposed on a direct current voltage to a developing roller to thereby develop an electrostatic latent image formed on a photoreceptor with toner. A bias voltage waveform superimposed at this time has an original period (first period) in which each of a development-side electrical potential and an opposite development-side electrical potential is applied one time and a period (second period) in which a Vpp is gradually increased from the initial value to the maximum value.

Abstract: The present invention prevents a toner bottle from being erroneously determined to be empty and allows toner to be reliably refilled into a hopper and thus a developing unit in an image forming apparatus including the developing unit configured to develop an electrostatic latent image formed on an image carrier, using toner.

Abstract: Flat field uniformity can be improved in images produced by an image development system having a development roller interposed between a supply of developer and an imaging element. A raw feed of developer is supplied from the developer supply to the development roller to produce both a metered feed of developer and an overfeed of developer, which is returned to the supply, from the raw feed. A plurality of mass densities of developer used in the system and a plurality of developer velocities through the system are determined, and respective product values of those developer mass densities and those developer velocities are thereafter calculated or otherwise determined. A maximum value of the respective product values is identified, and the image development system is then operated so that the maximum product value is produced.

Abstract: An image forming apparatus including a toner charge amount control portion for controlling the toner charge amount based on the property of a recording material; a recording material charging section for charging the surface of the recording material based on the toner charge amount controlled by the aforementioned toner charge amount control portion; and a recording media charge amount control portion for controlling the amount of charge on the surface of a recording material applied by the recording material charging section.

Abstract: An image forming apparatus to which a cleaning unit is detachably mountable to a main assembly of the apparatus includes a rotatable image bearing drum on which an electrostatic latent image is formed; a developing unit for developing the latent image into a toner image by supplying toner onto a surface of the drum; a cleaning unit including a cleaning blade for cleaning the drum by contacting to the surface of the image bearing member when the drum is rotating; a storing portion for storing information relates to a use amount of the developing unit; and a control device capable of executing toner supply into between the surface of the drum and the cleaning blade by supplying the toner to the surface of the drum from the developing unit in a period in which image formation on a sheet material is not executed, wherein when the toner supply is executed, the control device increases the amount of the toner to the surface of the drum from the developing unit with increase of the use amount of the developing unit

Abstract: Disclosed is an evaluation device of an optical writing device, comprising: the optical writing device; a light reception section; a drive section; and a control section to light each light emitting element in a previously set lighting pattern based on a light amount; to drive the drive section to move the light reception section to a position opposite to the light emitting element to be lit; to calculate characteristic data based on a light amount value of the light received by the light reception section; to calculate a first calculation value based on the characteristic data for each light emitting element; to calculate a second calculation value different from the first calculation value based on the characteristic data; to calculate a third calculation value based on the first calculation value and the second calculation value; and to instruct the display section to display the third calculation value.

Abstract: An image forming apparatus includes a developing chamber, an agitating chamber, a first conveying screw which is arranged in the developing chamber and conveys developer toward the agitating chamber, a second conveying screw which is arranged in the agitating chamber and conveys developer toward the developing chamber, a developing sleeve which bears developer supplied from the developing chamber and conveys the developer to the agitating chamber via a developing position opposed to a photosensitive drum, and a motor, which drives the developing sleeve, the first conveying screw and the second conveying screw, wherein stop timing of the developing sleeve is earlier than stop timing of the second conveying screw in accordance with image forming completion.