Abstract: An image forming apparatus includes a toner container, a first conveyance unit, and an apparatus main body. The apparatus main body includes a photosensitive drum, a development roller, a second conveyance unit, a toner conveyance passage, light sensor, an acquisition unit, and a control unit configured to execute an abnormality detection mode. In an abnormality detection mode, the acquisition unit acquires a first acquired value after the driving of the second conveyance unit with the driving of the first conveyance unit stopped. When the first acquired value satisfies a first condition, the acquisition unit further acquires a second acquired value after the driving of the second conveyance unit with the driving of the first conveyance unit stopped. The apparatus main body further includes a notification unit to make notification of the abnormality when the second acquired value satisfies a second condition.

Abstract: An amount-of-remaining-toner detecting device includes: a toner housing portion in which a toner bottle is housed, the toner bottle having a bottle body that is cylindrical and in which toner is housed, and a cap that is attached to one end of the bottle body in an axial direction of the bottle body and from which the toner housed in the bottle body is discharged; and circuitry configured to detect an amount of remaining toner in the toner bottle housed in the toner housing portion. The toner housing portion includes a first pair of electrodes facing each other with the bottle body interposed between the first pair of electrodes, and a second pair of electrodes facing each other with the bottle body interposed between the second pair of electrodes, at respective positions closer to the cap than the first pair of electrodes are.

Abstract: A developer cartridge includes a housing to accommodate a developer and including a developer outlet, and a sensing portion that forms a sensing area to detect whether or not the developer inside the housing is miming out. The sensing portion is recessed into a portion of a lower wall of the housing accordingly having a thickness less than a thickness of a remaining portion of the lower wall.

Abstract: An image forming apparatus includes an accommodating portion, a motor, and a development sensor. In the accommodating portion, a replacement developing component is fitted. The replacement developing component is fitted with a rotary member including an operating member, and stores toner. The motor rotates the rotary member on the replacement developing component fitted in the accommodating portion. When a new replacement developing component is fitted, the development sensor is not in contact with the operating member before the motor rotates the rotary member and is in contact with the operating member on the rotary member that has moved as the motor rotates. The development sensor outputs a first level when in contact with the operating member and outputs a second level when not in contact with the operating member.

Abstract: A drum unit includes a photosensitive drum, a developing unit, a toner cartridge, a connector and a relay board. The photosensitive drum is rotatable about a first axis extending in an axial direction. The developing unit includes a magnetic roller, a developer container, a conveyer member and a toner sensor. The developer container accommodates therein carrier, and has an inlet. The conveyer member is positioned in the developer container, and configured to convey toner and the carrier from the inlet toward the magnetic roller. The toner cartridge accommodates therein toner and is attachable to the developer container to replenish toner in the developer container through the inlet. The connector is electrically connected to an image forming apparatus. The relay board electrically connects the toner sensor to the connector. The relay board is configured to transmit a detection signal from the toner sensor to the image forming apparatus.

Abstract: A screw is rotated to replenish toner from a hopper to a developing device. Rotation of the screw, toner stored in the hopper, and a toner density in the developing device are detected. Whether or not to replenish toner from the hopper to the developing device is controlled based on a detection result of rotation of the screw. The number of rotations of the screw during a predetermined time period is acquired. The predetermined time period corresponds to a time period during which the replenishment processing is being executed and over which a state in which toner in the hopper is detected is changed to a state in which toner in the hopper is not detected. An abnormality of the hopper is detected if the number of rotations in the predetermined time period is larger than a predetermined number.

Abstract: An image forming apparatus includes an exposure unit that forms a latent image by irradiating a photoconductor body with light by using light emitting elements that are arranged along an axial direction of the photoconductor body, the exposure unit having an inlet to which air flow is introduced; and an air blowing unit that produces the air flow that is introduced to the exposure unit from an air blow opening that is provided at a position that is in correspondence with a position of the inlet of the exposure unit.

Abstract: In one example, a toner container has an interior volume defined by a body and a pair of wings extending up and out from the body.

Abstract: In one example, a processor readable medium has instructions thereon that, when executed by a processor, cause a system to detect a change in electrical conduction of a liquid moving at an interface between two surfaces and determine a conductivity of the liquid based on the detected change in conduction.

Abstract: An image forming apparatus includes a latent image carrier carrying a latent image, a developing device visualizing the latent image utilizing a two-component developer, a supply device supplying toner according to a change in toner density in the two-component developer inside the developing device, and a control device having an input side connected to a density sensor detecting a value of the toner density and an image information acquisition device acquiring information on an image formed on the latent image carrier, and an output side connected to a driving device driving the supply device. When the detected value is higher than a target value of the toner density stored by the control device, the control device performs control to stop the driving device or drive the driving device to supply toner in an amount less than a combined toner supply amount of first and second toner supply amounts.

Abstract: In an image forming apparatus that is provided with a developing unit to develop an electrostatic latent image formed on an image carrier as a toner image, the developing unit is provided with a developer reservoir that is disposed between a supplying roller to feed developer agitated by an agitating member into the developer reservoir and a developing roller to cause the developer in the developer reservoir to adhere onto the latent image on the image carrier so as to be developed as the toner image. A control section controls driving of the supplying roller, independently from driving of the agitating member.

Abstract: In a method or digital printer to print a recording material with toner particles applied with a liquid developer, toner concentration of the liquid developer is determined via measurement with aid of ultrasonic pulses. At least one ultrasonic pulse is generated by discharging an ultrasound emitter charged with a charge voltage. The ultrasonic pulse permeates the liquid developer and is received by an ultrasound receiver which generates a reception signal corresponding to the received ultrasonic pulse. With a control device, the charge voltage is regulated to a value such that a representative value of the reception signal corresponds to a predetermined desired value. The toner concentration is determined from the regulated charge voltage.

Abstract: A system and method for tracking consumables associated with an image forming device is described. An RFID reader is positioned to read RFID tags associated with the consumables when the consumables are inserted into, stationary in, or removed from the image forming device.

Abstract: The present invention provides an image forming apparatus including a moving member configured to support a first process cartridge and move the first process cartridge to a position for forming an image, and a detection unit configured to detect a state of a second process cartridge, in which the moving member holds the detection unit.

Abstract: A replaceable unit for an electrophotographic image forming device according to one example embodiment includes a housing having an inner volume forming a reservoir for storing toner. A rotatable shaft is positioned within the reservoir. A paddle is mounted on the shaft and rotatable independent of the shaft. A driving member is rotatable with the shaft and positioned to push the paddle when the shaft rotates. The paddle is free to fall ahead of the driving member. The paddle includes a magnetic element rotatable with the paddle and detectable by a magnetic sensor when the replaceable unit is installed in the image forming device for detecting the motion of the paddle.

Abstract: An image forming apparatus includes an image bearing member for bearing an electrostatic latent image, and a developing device including a container for accommodating the developer, a developer carrying member for carrying the developer and for developing the electrostatic latent image with the developer, a developer supplying member for supplying the developer to the developer carrying member, and stirring member for stirring the developer and for feeding the developer to the developer supplying member. In addition, a controller controls, before image formation, a stirring operation by the stirring member on the basis of information on electrostatic capacity between the developer carrying member and the developer supplying member.

Abstract: A method of estimating a quantity of toner remaining in a toner cartridge includes using an adaptive term, a value of which is adjusted based on actual printer toner usage. A printer configured to produce an estimate of an amount of toner remaining in a toner cartridge installed in that printer includes a toner remaining algorithm; and an adaptive term, a value of which is adjusted based on actual printer toner usage rate. The algorithm uses the adaptive term to produce the estimate of an amount of toner remaining in the toner cartridge.

Abstract: An image forming apparatus includes a control unit that controls each component, a first storage unit that is a non-volatile and rewritable storage unit mounted on the control unit, a toner containing unit that contains toner to be used for an image forming, a second storage unit that is a non-volatile and rewritable storage unit mounted on the toner containing unit, and a detecting unit that detects an amount of the toner remained in the toner containing unit. The control unit stores count information into the second storage unit, the count information is copied from the second storage unit to the first storage unit, when the detecting unit detects that the amount of the toner remained in the toner containing unit is not enough, and the count information is kept on being stored into the first storage unit, until the toner containing unit is replaced with a new one.

Abstract: An image forming apparatus includes an image carrier, and a rotation device having image-forming devices each containing a toner and forming a toner image on the image carrier with the toner. The apparatus further includes: a detector attached to at least one of the image-forming devices to detect a quantity of the toner, thereby outputting an analog signal representing the quantity; and a transmission path transmitting the analog signal to the outside of the rotation device. The transmission path includes: a rotation terminal mounted on and rotating with the rotation device; and a contact terminal provided outside the rotation device, and maintaining continuity with the rotation terminal by contacting a surface of the rotation terminal even when the rotation terminal rotates. The apparatus further includes a correction section correcting the analog signal transmitted by the transmission path, according to a contact resistance between the rotation terminal and the contact terminal.

Abstract: An image forming device includes a toner supplying unit to supply the toner to a storage unit. A mixer supplies developer in the storage unit to a developing roller, and a developer sensor detects the amount of developer on the surface of the developing roller. A toner concentration sensor detects toner concentration in the developer stored in the storage unit, and a control unit adjusts at least one of a developing bias and a rotation speed of the mixer based on a value detected by the developer sensor and a value detected by the toner concentration sensor, such that a printed image has uniform density.

Abstract: An image forming apparatus includes an image bearing member for bearing a latent image, a developer carrying member for developing the latent image with a developer, a developer accommodating portion for accommodating the developer, and a detecting device including a light emitting element and a light receiving element for detecting a remaining developer amount in the developer accommodating portion. In addition, a stirring member stirs the developer by rotating in the developer accommodating portion. The stirring member is rotated in a first period in which the stirring member crosses an optical path of light from the light emitting element toward the light receiving element and a second period in which the stirring member does not cross the optical path of the light.

Abstract: An image forming apparatus including an image forming unit to develop an electrostatic latent image formed on an image carrier with toner, an intake fan to draw air used for cooling the image forming unit into the image forming apparatus, an exhaust fan to exhaust the air from the image forming apparatus, and an exhaust duct to form an airflow path between the image forming unit and the exhaust fan. One end of the exhaust duct is disposed below the exhaust fan.

Abstract: A toner replenishing device includes a sub hopper (toner container), a toner detection sensor, an agitator, and a paddle. The sub hopper contains toner. The toner detection sensor is located on a wall surface in the sub hopper and detects whether toner remains at a height at which it is located. The agitator rotates in the sub hopper to clean the detection surface of the toner detection sensor. The paddle serves as a toner collecting unit that collects toner to the vicinity of the detection surface of the toner detection sensor in the sub hopper.

Abstract: An image forming apparatus which has an improved follow-up property indicating how a toner supply amount follows a toner consumption amount to prevent a defective image, including: a photosensitive drum; a developing device; a toner replenishing device; a toner sensor configured to detect a toner amount inside the developing device; and a controller configured to drive the toner replenishing device to replenish the developing device with toner based on a detection result of the sensor during a developing device driving time and to stop the toner replenishing device during a non-image forming period to stop replenishing the developing device with toner, wherein if the toner amount inside the developing device detected by the sensor is reduced to a level equal to or lower than a predetermined threshold value, the controller drives the developing device and the toner replenishing device even during the non-image forming period.

Abstract: An image forming apparatus includes a developing unit with a supply roller that supplies toner to a developing roller located such that of a contact region between the developing roller and the supply roller, the uppermost stream position in the rotating direction of the supply roller during image formation is located higher than the lowermost stream position, wherein the supply roller rotates in a reverse direction during image formation if the developing unit is new.

Abstract: An image forming apparatus capable of correcting image density promptly. A developing device supplies toner to an electrostatic latent image on a photosensitive drum by development contrast potential to form a toner image. An image density sensor detects the density of a patch image on the photosensitive drum. A toner density sensor detects the toner density of developer in the developing device. The amount of toner supplied for replenishment is adjusted when the detected toner density is above a predetermined upper limit value or below a predetermined lower limit value. Further, when the detected patch image density is above a predetermined upper limit value, toner replenishment control is switched to development contrast control to increase image density. When the detected patch image density is below a predetermined lower limit value, the toner replenishment control is switched to the development contrast control to reduce image density.

Abstract: In a new printer, a toner cartridge is mounted in the state where there is no toner in a reserve tank, and toner of the amount of filling toner D therein is supplied with the amount of full accommodation toner E for filling up the reserve tank by a toner supply mechanism. The toner of the amount of remaining surplus toner F remains in the toner cartridge. The amount of toner consumption G is measured by a dot counter during a printing execution. In the case where a toner density sensor detects a toner decreasing, the toner is supplied to a developing unit from the reserve tank. When it becomes G>F, it display-informs a user of “toner cartridge exchange is allowed”. Hereby, it enables to exchange the toner cartridge without stopping operation of the main body of the image forming apparatus using a two-component developer.

Abstract: The invention provides a developer cartridge with a counting mechanism. The developer cartridge comprises a developer and the counting mechanism, wherein the counting mechanism is provided with protrusions which come in contact with a contact lever on an electronic photographing device so as to count the developer cartridge; and each protrusion has a first position and a second position in the direction perpendicular to a side wall of the developer cartridge, and is, in the first position, in contact with the contact lever, but is not, in the second position, in contact with the contact lever. The working principle of the developer cartridge adopting the counting mechanism is greatly different from the prior art. Therefore, the structure of the counting mechanism of the developer cartridge is simpler and more convenient and reliable; the production precision and the production cost are reduced; and the market competitiveness of the developer cartridge is improved.

Abstract: A toner supplying method for supplying toner from a toner container to a developing part that causes toner to adhere to a latent image formed on a latent image carrying member and develops the latent image, includes detecting a toner amount in the developing part as being equal to or less than a predetermined toner amount value; forming a fog detecting image in a case where the toner amount in the developing part is equal to or less than the predetermined toner amount value, and detecting fog; and determining based on the detected fog whether to execute a toner ejecting process of ejecting the toner remaining in the developing part toward the latent image carrying member before supplying the toner to the developing part from the toner container.

Abstract: An image forming apparatus including a wireless tag reader is described. The wireless tag reader is configured to be located in a first position to read wireless tags associated with consumables when the consumables are inserted into, stationary in, or removed from the image forming apparatus, and in a second position to read wireless tags outside of the image forming apparatus.

Abstract: An image forming apparatus include an image bearing member, a developing container receiving a developer, a developer carrying member for carrying and conveying the developer, a developer feed member for supplying the developer to the developer carrying member, a detection device for detecting an amount of developer in the developing container by detecting an electrostatic capacitance between the developer carrying member and the developer feed member, and a control device for changing a rotational speed of the developer feed member into a plurality of speeds corresponding to the plurality of image forming speeds. The control unit controls the rotational speed of the developer feed member prior to the execution of a detection operation of the detection device so as to be faster than the slowest speed of said plurality of speeds.

Abstract: A Faraday cage includes a casing structured by a first housing having a first outer cover made of a conductive material, and a first inner cover made of a conductive material, which is accommodated in the first outer cover and is electrically insulated from the first outer cover, and a second housing having a second outer cover made of a conductive material, which fits the first outer cover, and a second inner cover made of a conductive material, which is accommodated in the second outer cover and is electrically insulated from the second outer cover, the first and second housings being separable from each other; and a filter cartridge disposed inside the casing configured to be separable into two pieces, which accommodates therein a first filter for collecting fine particles sucked in from the outside the casing.

Abstract: An image forming apparatus includes a toner carrier, a toner image forming unit, and a toner concentration sensor. The toner carrier includes a transparent film. The toner image forming unit forms a toner image onto the toner carrier. The toner concentration sensor senses the concentration of toner on the toner carrier. The toner concentration sensor includes first and second light emitting elements and a light receiving element. The light emitting elements each radiate light directly or indirectly to the toner carrier. The light receiving element receives reflecting light originating from the light emitting elements. The first light emitting element radiates light having a wavelength of a predetermined reflectance resulting from direct radiation to the toner carrier. The second light emitting element radiates light having a wavelength that causes a lower reflectance resulting from direct radiation to the toner carrier than a reflectance resulting from radiation to the toner.

Abstract: The developer supplying device supplies a supplementary developer including a toner and a carrier in a predetermined weight ratio. The developer supplying device includes a supplementary developer container containing the supplementary developer, and a supplementary developer feeding passage configured to feed the supplementary developer from the supplementary developer container to a developing device. The supplementary developer container is replaced when the supplementary developer is substantially exhausted. The developer supplying device further includes a carrier concentration determining device provided on the supplementary developer feeding passage to determine the concentration of the carrier in the supplementary developer fed through the supplementary developer feeding passage, and a residual supplementary developer amount estimating device configured to estimate the amount of the supplementary developer remaining in the supplementary developer container.

Abstract: An image forming apparatus includes a determination unit determining whether an amount of colorant remaining in a container is equal to or greater than a threshold value and a control unit causing a print unit selectively to perform plural double-side printing methods in which at least one of the number of one-side printed sheets N and the number of opposite-side printed sheets M is different. When the determination unit makes a negative determination, the control unit performs a negative selection process of selecting a double-side printing method satisfying at least one condition of a condition that the number of one-side printed sheets N is smaller than that when the determination unit makes an affirmative determination and a condition that the number of opposite-side printed sheets M is greater than that when the determination unit makes the affirmative determination.

Abstract: An image forming apparatus includes an image bearing member and a developing device for developing an electrostatic latent image. The developing device includes a developer container, a rotatable developer carrying member, including a first electrode member; and a developer supplying member, including a second electrode member. The apparatus further includes a measuring device capable of measuring a remaining developer amount; and a replenishing device for performing a replenishing operation by rotating the developer supplying member while applying a DC bias between the first and second electrode members so that a value obtained by subtracting an electric potential of the second electrode member from an electric potential of the first electrode member has a polarity identical to a normal charge polarity of the developer. When the remaining developer amount measured is not more than a threshold, the replenishing operation is performed and the remaining developer amount is measured again.

Abstract: An image forming device includes a density detector that detects image density, and a memory that stores information relating image density to dot size. When a dot size is specified, the image forming device automatically obtains the corresponding image density from the information in the memory, prints a test pattern, compares its density with the density corresponding to the specified dot size, and adjusts an image forming parameter until the density corresponding to the specified dot size is obtained. Dot size can be accurately adjusted in this way without the need for elaborate measuring equipment. In particular, the size of dots used to embed invisible information in images can be accurately controlled.

Abstract: A developing apparatus including a developing container for containing developer, the developing container having an opening portion, a developer carrying member for carrying the developer at the opening portion, a detecting member for detecting a developer amount, the detecting member detecting a capacitance between the developer carrying member and the detecting member, and a force receiving portion for receiving a force and moving the developing container between a first position in which a developing operation is performed by the developer carrying member and a second position in which the developing operation is not performed, wherein the capacitance can be detected in the second position, and the detecting member is a rotatable developer supplying member for supplying the developer to the developer carrying member, the developer supplying member including a foam layer in which the developer can enter.

Abstract: An image forming apparatus includes: an image carrier; a developing housing that accommodates a developer for developing an electrostatic latent image into a developer image; a developer carrier, which carries the developer in the developing housing, and which supplies the developer to the image carrier; a developing bias supply part that supplies a developing bias to the developer carrier; a remaining quantity calculation part that calculates a remaining quantity of the developer in the developing housing; a deterioration grade storage part that stores a relationship between the remaining quantity of the developer in the developing housing and a deterioration degree of the developer caused by the developing operation; and a developing bias setting part that sets a value of the developing bias in accordance with the remaining quantity calculated by the remaining quantity calculation part and the relationship stored in the deterioration grade storage part.

Abstract: An image forming apparatus is configured to give an instruction for unlocking of a cover corresponding to a toner container, from a replacement screen of the toner container displayed when no toner inside the toner container is detected. Further, the image forming apparatus is configured such that the cover corresponding to at least one toner container can be unlocked at a time from the displayed screen.

Abstract: In this toner concentration sensor, as the magnetic permeability of a two-component developer 3 containing toner and carrier in a two-component developing unit 1 has changed with changing TC ratio of the two-component developer, the oscillation frequency of a first oscillation circuit 20 having a detection coil 5 changes, on the other hand the oscillation frequency of a second oscillation circuit 30 having a reference coil 6 does not change. While, changes in temperature conditions cause the oscillation frequency of the second oscillation circuit to change in the same way as the oscillation frequency of the first oscillation circuit. Therefore, utilizing a difference between the oscillation frequencies of the first and second oscillation circuits makes it possible to cancel out changes in the temperature conditions so that a value corresponding to only the magnetic permeability of the two-component developer can be obtained.

Abstract: A toner-remaining-amount detection sensor includes a rubber member, an actuator, a transmission sensor, and a holder member which integrally holds the rubber member, the actuator, and the transmission sensor. The actuator is supported by the holder member so as to move to a first position at which the transmission sensor detects that a toner remaining amount in a toner storage container is a predetermined amount or more when a toner pressure in the toner storage container acts on the rubber member, and to move to a second position at which the transmission sensor detects that the toner remaining amount in the toner storage container falls below the predetermined amount when the toner pressure in the toner storage container does not act on the rubber member. When the actuator is at the second position, the actuator partially comes into contact with the holder member so that a gap is formed between the actuator and the rubber member.

Abstract: An image forming apparatus determines whether an amount of colorant remaining in a container is equal to or greater than a threshold value and controls a print unit to perform a reduced printing operation with a reduced amount of colorant if the amount of the remaining colorant is less than the threshold value is made and to perform the reduced printing operation on one side of a new non-printed sheet instead of performing the reduced printing operation on the opposite side of a one-side printed sheet existing if the amount of the remaining colorant is less than the threshold value.

Abstract: An image forming apparatus includes a developing device for developing a latent image formed on an image bearing member on the basis of image information, into a developed image with a developer, the developing device including a developer accommodating portion for accommodating the developer and a stirring member for stirring the developer in the developer accommodating portion; an optical remaining amount detecting device for detecting a remaining amount of the developer in the developer accommodating portion, by passing light through an inside of the developer accommodating portion; a consumption amount calculation device for calculating information relating to a consumption amount of the developer on the basis of the image information; and an outputting device for outputting an information signal indicative of a developer remainder which is either one of a developer remainder based on a detection result of the optical remaining amount detecting device and a developer remainder based on the information rel

Abstract: A developing apparatus including a developing container for containing developer, the developing container having an opening portion, a developer carrying member for carrying the developer at the opening portion, a detecting member for detecting a developer amount, the detecting member detecting a capacitance between the developer carrying member and the detecting member, and a force receiving portion for receiving a force and moving the developing container between a first position in which a developing operation is performed by the developer carrying member and a second position in which the developing operation is not performed, wherein the capacitance can be detected in the second position, and the detecting member is a rotatable developer supplying member for supplying the developer to the developer carrying member, the developer supplying member including a foam layer in which the developer can enter.

Abstract: A process cartridge includes an image bearing member cartridge and a developing cartridge detachably installed in the image bearing member cartridge. The image bearing member cartridge has a pair of first and second side plates, a latent image bearing member, and a pressure member. The developing cartridge has a pair of third and fourth side plates and a pair of first and second light guides fixed at the third and fourth side plates, respectively. The pressure member presses side surfaces of the first and the second light guides, thereby urging the developing agent bearing member toward the latent image bearing member.

Abstract: An image forming apparatus includes a control unit that controls each component, a first storage unit that is a non-volatile and rewritable storage unit mounted on the control unit, a toner containing unit that contains toner to be used for an image forming, a second storage unit that is a non-volatile and rewritable storage unit mounted on the toner containing unit, and a detecting unit that detects an amount of the toner remained in the toner containing unit. The control unit stores count information into the second storage unit, the count information is copied from the second storage unit to the first storage unit, when the detecting unit detects that the amount of the toner remained in the toner containing unit is not enough, and the count information is kept on being stored into the first storage unit, until the toner containing unit is replaced with a new one.

Abstract: An image forming apparatus is provided that includes a detection unit to detect a measure of consumption of a second cartridge. A difference between toner amounts is acquired by subtracting a toner amount per unit area of a toner image corresponding to a maximum density image formed on a first image bearing member from a toner amount per unit area of a toner image corresponding to a maximum density image formed on a second image bearing member. When the detection unit detects a second measure of consumption that is in a consumed state more than a first measure of consumption, a control unit controls a first toner forming unit and a second toner forming unit so that a difference between toner amounts is greater than when the detection unit detects the first measure of consumption.

Abstract: An imaging apparatus includes a toner cartridge within a housing having a rotatable shaft, a cam rotatably mounted on the shaft, an optical sensor mounted on the housing having an emitter and a receiver forming an optical path therebetween, and a flag mounted on the housing having a first arm and a second arm. The optical sensor has an output that changes when the optical path changes from blocked to unblocked and from unblocked to blocked. The flag has a home position where the first arm is disposed in the rotational path of the cam and the second arm either blocks the optical path or unblocks the optical path. Rotation of the rotatable shaft causes the cam to engage and disengage the first arm causing the second arm to change from blocking the optical path to unblocking the optical path or vice versa.

Abstract: A supply control unit is configured to, in a successive image-forming operation, perform a process of successively generating a driving control pattern for a toner supply device based on image information of each page, and synthesizing an unused portion of the driving control pattern which is obtained by eliminating a portion of the driving control pattern already reflected on a driving control of the toner supply device from the driving control pattern generated based on image information of a previous page with a driving control pattern generated based on a subsequent page.