Abstract: A cooling device includes a heat receiving unit disposed to contact a surface of a temperature-increasing part the temperature of which increases during an image forming process; a radiation unit transferring heat from a cooling liquid; a tube for circulating the cooling liquid between the heat receiving unit and the radiation unit in a liquid circulation direction; a conveying unit conveying the cooling liquid through the tube; a coupling having an internal flow path and including a first end to which a first part of the tube is connected and a second end to which a second part of the tube is connected; and an outlet for draining the cooling liquid from the tube. At least one of the first part of the tube and the second part of the tube extends to a position lower than the position of the coupling.

Abstract: An image forming apparatus includes a fusing device; a developing device; a partition wall disposed between the fusing device and the developing device, wherein the partition wall includes a Peltier element for transferring heat from the developing device to the fusing device and a cooling heat storage member disposed nearer to the developing device than the Peltier element.

Abstract: The aim of the present invention is to provide an image forming apparatus that accurately detects surface temperature of a rotating body using a noncontact temperature detection section and corrects the detected temperature according to the temperature of the surrounding area. The present invention detects the temperature of a thermal unit and the temperature of a holding unit and corrects the temperature of the thermal unit based on the temperature of the holding unit so that effects from the temperature of a surrounding area can be corrected and the temperature can accurately be detected without scarring a surface of the rotating body. Accurate regulation of the surface temperature of the rotating body can therefore be performed.

Abstract: A control unit controls a device that executes an image forming process, compares changes of each toner adhesion amount in an image-density-detection pattern image when a developing-bias control condition is changed, with respect to a toner adhesion amount in an image-density-detection pattern image in a normal status, performs a malfunction-occurrence prediction process according to the degree of each change of the densities, and displays the result.

Abstract: A conveying device includes a guiding member that has a contact portion that comes into contact with an inner peripheral surface of a conveying belt in which a plurality of suction holes is formed, and an endless conveying belt that has ridges to hold a recording medium lest the recording medium come into contact with the suction holes. A plurality of slits is formed in the contact portion to attract the recording medium to the endless conveying belt through the suction holes. The slits are formed to prevent the conveying belt from falling in the slits when the conveying belt is pressed due to suction.

Abstract: An image heating apparatus includes a heating rotary member, which heats an image on a recording material at a nip portion, an air blowing device for blowing air toward an air blowing port to cool a predetermined area of the heating rotary member, a shutter, which opens and closes the air blowing port, and a determination device. The determination device determines an execution of an operation of the air blowing device with the shutter opened after a first job is completed, in accordance with a size of a recording material in a width direction perpendicular to a recording material transport direction in a second job for supplying a recording material, between an execution termination of the first job for continuously supplying recording materials having a size smaller than a predetermined size in the width direction, while operating the air blowing device, and a start of a recording material supply of the second job, in a case that the second job is executed subsequent to the termination of the first job.

Abstract: An image forming apparatus includes an image forming device that forms a toner image on a recording medium, a heat fixing device provided adjacent to the image forming device to fix the toner image onto the recording medium by heat, and a heat shielding device that shields the image forming device from the heat radiated from the heat fixing device. The heat shielding device includes a heat shielding member interposed between the image forming device and the heat fixing device to receive the heat radiated from the heat fixing device, a heat transferring member attached to the heat shielding member to transfer the heat received by the heat shielding member to one end portion thereof, a heat radiating fin device provided at the one end portion of the heat transferring member to radiate the transferred heat, and a fan that supplies air to the heat radiating fin device.

Abstract: An image forming apparatus includes an image carrying member carrying a latent image and a development device disposed along a surface of the image carrying member. The development device includes a developer storing case storing a developer, a developer carrying member carrying the developer to develop the latent image with the developer in an area in which the surface of the developer carrying member faces the surface of the image carrying member, a developer supplying member supplying the developer carrying member with the developer, a metal member extending in an axial direction of the developer carrying member to receive heat conducted from the developer, and a heat releasing device provided on at least one of the outer sides of the developer storing case in the axial direction of the developer carrying member and disposed in contact with the metal member to release the heat conducted from the metal member.

Abstract: An image forming apparatus includes plural image holding members that hold toner images, a belt unit, an apparatus side portion, and a fan unit. The belt unit includes a belt member disposed facing the plural image holding members. The apparatus side portion is disposed on an outer side of the belt unit in an axial direction of rotating shafts of the plural image holding members. The fan unit is disposed between the apparatus side portion and the belt unit and aerates end portions of the belt unit in the axial direction of the rotating shafts.

Abstract: A developing device according to the present invention includes a developer storing section storing a developer, a stirring member disposed in the developer storing section and transporting the developer while stirring the developer, a developer carrier receiving the developer from the developer storing section and carrying the developer, a developer regulating member regulating the amount of the developer received by the developer carrier from the developer storing section, and a heat-dissipating member disposed at a position in contact with the developer and capable of dissipating heat of the developer. The heat-dissipating member has a surface in contact with the developer and the contact surface of the heat-dissipating member has an arithmetic surface roughness Ra1 that is set to be equal to or less than ? of the volume average particle size of toner particles contained in the developer.

Abstract: An image processing apparatus is provided with an image reading unit configured to read an image on an original, the original being discharged from a discharging side of the image reading unit, an image forming unit configured to form an image on an recording medium, and a discharge guide configured to guide the original to the discharging side of the image reading unit, the discharge guide being arranged to cover the image forming unit from the discharging side of the image reading unit. The discharging guide is configured to be movable between an opened position and closed position with respect to the image forming unit, the image forming unit being exposed to outside when the discharging guide is located at the opened position.

Abstract: A cooling device includes a cooling roller having a dual tube structure including an inner tube disposed inside an outer tube, an outside flow passage and an inside flow passage in which a cooling medium flows, and an opening that allows the outside flow passage to communicate with the inside flow passage, a cooling medium transport unit, and a rotating tube joint unit mounted to one end side of the cooling roller. One end of the outer tube is coaxially rotatably fitted to a first fitting section of the rotating tube joint unit. One end of the inner tube is coaxially fitted into and rotatably or fixedly supported to a second fitting section of the rotating tube joint unit, and the other end is coaxially fitted into and rotatably or fixedly supported to a fitting section on the other end of the outer tube.

Abstract: A cooling device is disclosed. The cooling device includes a cooling section which is moveably provided with respect to an image forming device body between a first location and a second location, the second location being different from the first location, and which cools surroundings with a cooling medium to be supplied; a cooling medium supply section which is provided at the image forming device body and which cools the cooling medium to supply the cooled cooling medium to the cooling section; and a connecting member which connects the cooling section and the cooling medium supply section to circulate the cooling medium between the cooling section and the cooling medium supply section, wherein the connecting member includes a flexible member and is supported by a guiding member which guides an operation of tracking the connecting member in conjunction with movement of the cooling section.

Abstract: Disclosed is a cooling device that includes a cooling part that is movably provided between a first position and a second position different from the first position with respect to an image forming apparatus main body and cools a periphery thereof with a cooling medium to be supplied; a cooling medium supply part that is provided in the image forming apparatus main body and cools and supplies the cooling medium to the cooling part; and a connecting member that connects the cooling part to the cooling medium supply part to circulate the cooling medium between the cooling part and the cooling medium supply part; wherein the connecting member is configured to include a flexible member and spirally provided with a moving direction of the cooling part as an axis center.

Abstract: An image forming apparatus which includes a fan to generate an air flow within the image forming apparatus, and a controller to drive the fan at a first speed corresponding to a first time period representing an image forming operation and to drive the fan at a second speed corresponding to a second time period corresponding to operations other than the image forming operation.

Abstract: The humidity detecting device includes a detection unit and a controller. The detection unit includes a humidity sensor for producing a humidity detection signal by detecting a humidity, a temperature sensor for producing a temperature detection signal by detecting a temperature surrounding the humidity sensor, and a common power supply line connected to the humidity sensor and the temperature sensor. The controller includes an application circuit for applying a power supply voltage to the humidity sensor and the temperature sensor through the common power supply line, a read circuit for producing a read-out humidity value corresponding to the humidity detection signal and a read-out temperature value corresponding to the temperature detection signal, and a correction circuit for correcting the read-out humidity value based on the read-out temperature value.

Abstract: An image forming apparatus includes an image forming unit having an image carrier, a developing agent container for holding a developing agent, and a developing agent supplier for supplying the developing agent from the developing agent container to the image carrier. A controller determines the amount of use of the image forming unit. A shaking mechanism shakes the image forming unit from time to time, at intervals determined by the controller according to the amount of use of the image forming unit. The shaking loosens the developing agent so as to maintain its fluidity, thereby avoiding faint image formation.

Abstract: A sheet post-processing apparatus includes a warming-up device including a first duct connected to a fan to lead warm exhaust air sucked from an image forming apparatus into an apparatus, a second duct provided to lead the warm exhaust air discharged by a fan or ambient Air in a housing to the fan, and a control valve that performs switching control to lead, when a temperature sensor measures temperature equal to or higher than proper operation temperature, high-temperature Air in the housing and the warm exhaust air such that the fan discharges the high-temperature Air and the warm exhaust air to the outside and lead, when the temperature sensor measures temperature lower than the proper operation temperature, the warm exhaust air to the mechanical members of the sheet post-processing apparatus and the temperature sensor.

Abstract: An image forming apparatus includes a first image bearing drum; a first developing device; a second image bearing drum; a second developing device; an intermediary transfer member for carrying the image transferred from the first drum and the toner image transferred from the second drum; a cleaning device for collecting toner deposited on the intermediary transfer member; heating means for heating at least a sheet; an executing portion capable executing an operation in a first mode for forming the image on the intermediary transfer member from the first and second drums and an operation in a second mode for forming an image on an intermediary transfer member from the second drum without transfer of the toner image from the first drum onto the intermediary transfer member; a temperature detecting portion disposed in the apparatus; a fan for feeding air in the apparatus; control means for controlling the fan on the basis of an output of the temperature detecting portion so that an air feed amount increases with

Abstract: A light-emitting unit having an arrayed light source comprises a substrate; an arrayed light source group containing the arrayed light source arranged in a first direction; a lens array for focusing the light emitted from light emitting elements constituting the arrayed light source; and a lens support having a cavity formed between arrayed light source group and the lens array; the lens support having a first hole for introducing a fluid into the cavity, and a second hole for discharging the introduced fluid in a second direction crossing the first direction.

Abstract: An image forming apparatus includes an imaging unit for black and imaging units for other colors, a writing unit for black and a writing unit for other colors, a first heater corresponding to the imaging unit and the writing unit for black color, and a second heater corresponding to the imaging units and the writing unit for other colors. Turning ON/OFF of each of the first heater and the second heater are controlled separately. Thus, the first heater can be ON while the second heater is OFF.

Abstract: An image writing unit causes, upon being set in a write position, an optical system unit to be movable and positions the optical system unit, with a hitting portion of the optical system unit hitting a blocking portion in a chassis. A holding unit includes, in a state in which the image writing unit is set in the write position, a portion defining an opening that faces either one of an air intake unit and an air exhaust unit. The air intake unit blows an intake air to the optical system unit through the opening, or the air exhaust unit draws an exhaust air around the optical system unit through the opening.

Abstract: An image-forming system includes an image-forming apparatus, and a terminal device capable of communicating with the image-forming apparatus. The terminal device comprises a signal-transmitting unit. The image-forming apparatus comprises an image-forming unit; a signal-receiving unit; a first storage unit for storing a starting condition of a preparing action for image formation in the image-forming unit; a first determining unit for determining whether the starting condition is satisfied at the time the signal-receiving unit receives the signal from the terminal device; and an instruction unit for providing an instruction to start the preparing action in the image-forming unit when the first determining unit determines that the starting condition is satisfied.

Abstract: An image forming apparatus capable of minimizing a temperature rise of a cover by substantially preventing heat emission from a fusing device to an outside is disclosed. The image forming apparatus includes a main body, a fusing device mounted in the main body, the fusing device having an outlet to discharge paper, an opening/closing member opening and closing the outlet of the fusing device, a cam member moving the opening/closing member between a first position in which the opening/closing member closes the outlet to prevent heat in the fusing device from being emitted through the outlet and a second position in which the opening/closing member opens the outlet to permit the paper to pass through the outlet, a driving part rotating the cam member, and a control unit controlling the driving part to determine a rotational position of the cam member.

Abstract: A pre-heater system and adapted to be used on an electrostatic marking apparatus for improving gloss on media having marking thereon at a location in the apparatus prior to a conventional fuser roll assembly or station, the system including a primary heater adapted to blow pressurized hot air into a surface of an image receiving media in order to substantially dispense hot air throughout an entire paper or media surface; and a preheat media transport for transporting media from the location in the apparatus prior to the conventional fuser roll assembly or station through the primary heater, the preheat media transport includes means for maintaining the preheat media transport at a substantially uniform predefined temperature.

Abstract: In a roller to affect a temperature of a print substrate in a digital printer, a hollow roll is mounted to a shaft. Channels are provided for a heat transport medium in the hollow wall. A roller shell of the hollow roll is comprised of arc-shaped segments extending over a width of the hollow roll. The segments end laterally in arms designed so that the arms of adjacent segments are connected to each other. The channels extend over the width of the hollow roll and are assembled respectively from the segments of the roller shell. A respective covering plate is clamped between the arms of the respective segments.

Abstract: An image forming apparatus includes an image bearing belt configured to bear a toner image, a driving roller configured to rotationally drive the image bearing belt, first and second image forming units configured to form toner images on the image bearing belt. To correct color misregistration, the image forming apparatus uses a mark detecting unit including a plurality of sensors provided at different positions in a rotation direction of the image bearing belt to detect a mark on the image bearing belt, and adjusts a rotational speed of the driving roller, based on detection results of the mark detecting unit and temperature detected within the image forming apparatus.

Abstract: A cleaning unit, which can be incorporated in a process cartridge removably installable in an image forming apparatus, includes a lubricant applicator to apply lubricant to an image carrier, a first blade disposed upstream from the lubricant applicator in a direction of rotation of the image carrier with its distal end held in contact with the image carrier to remove residual toner remaining on the image carrier, a second blade disposed downstream from the lubricant applicator in the direction of rotation of the image carrier with its distal end held in contact with the image carrier to regulate the amount of lubricant applied to the image carrier, a temperature measuring member to measure a temperature of or near the second blade, a heater, and a temperature controller to control the heater to heat the second blade so that the measured temperature falls within a given set temperature range.

Abstract: An image heating apparatus including: an image heating member, which heats an image on a recording material in a nip portion; an air blower, which blows air toward an air blowing port to cool a predetermined area of the image heating member; and a shutter, which opens and closes the air blowing port, in which the shutter is kept at a closed position when a temperature of the predetermined area of the image heating member is equal to or lower than a predetermined temperature, whereby a temperature rise in a non-sheet passing portion can be efficiently reduced by using the small air blower without lowering the productivity when small-size recording materials are continuously passed nor reducing the lifetime of the air blower.

Abstract: An image fixing apparatus controls temperature of a rotating member for fixing with compensation for delay by using a Smith predictor with a controlled object model to reduce temperature ripple effectively. In one example, the image fixing apparatus includes a pair of rotating members to form a nip portion, a heater to heat the rotating member, a temperature sensor to detect temperature of the rotating member, a calculator to calculate a heat value to attain a target temperature of the rotating member, a controller to control the heater based on a calculation result of the heat value with compensation for delay using a model according to the calculation result, and a selector to select a control in which an output of the compensation is input into the calculator or a control in which the output of the compensation is not input into the calculator.

Abstract: An optical scanning apparatus includes a plurality of light sources capable of emitting light. A detection unit detects a light quantity of the light emitted from the plurality of light sources. A control unit controls drive current of a light source designated as a control object based on a detection result obtained by the detection unit. The control unit controls the drive current based on an activation state of the light source designated as the control object and an activation state of a light source other than the control object.

Abstract: An image forming apparatus capable of effectively cooling down a recording medium heated by a toner fixing unit includes a cooling mechanism having a duct, a radiating fin, and a heat pipe. The duct includes two air flow structures, each including an air inlet, an air supply path, an air exhaust path, and an air outlet. The radiating fin is arranged between the air supply path and the air exhaust path of each air flow structure. The radiating fin has a plurality of fins each radially extending in parallel to a flow of air in the duct. The heat pipe has one side connected to the radiating fin and another side arranged in a vicinity to an exit of a toner fixing mechanism. The heat pile rotates to draw heat from the heated recording sheet having a fixed toner image.

Abstract: An image reading and recording apparatus has a scanner unit for effecting exposure conforming to an image signal on a photosensitive drum, a heat roller pair for fixing a toner image formed on a recording sheet, and a reading unit for reading an original. The heat roller pair is disposed above a process cartridge, and a cartridge dismounting space for permitting dismounting of the process cartridge therethrough is disposed between the heat roller pair and the scanner unit.

Abstract: An image heating apparatus including: a heating rotary member, which heats an image on a recording material in a nip portion; an air blowing unit, which blows air toward an air blowing port to cool a predetermined area of the heating rotary member; and a shutter, which opens and closes the air blowing port, wherein a cooling operation can be performed continuously with the shutter opened after image heating processing is completed, whereby a downtime required for making the temperature distribution over the entire heating area uniform after the continuous sheet supply of small-size recording materials is reduced remarkably.

Abstract: An image forming apparatus includes an image carrying member carrying a latent image and a development device disposed along a surface of the image carrying member. The development device includes a developer storing case storing a developer, a developer carrying member carrying the developer to develop the latent image with the developer in an area in which the surface of the developer carrying member faces the surface of the image carrying member, a developer supplying member supplying the developer carrying member with the developer, a metal member extending in an axial direction of the developer carrying member to receive heat conducted from the developer, and a heat releasing device provided on at least one of the outer sides of the developer storing case in the axial direction of the developer carrying member and disposed in contact with the metal member to release the heat conducted from the metal member.

Abstract: An image forming apparatus having a liquid-cooled cooling system prevents problems caused by a potential leakage of coolant used in the liquid-cooled cooling system. The liquid-cooled cooling system cools a heat-generating image forming portion using the coolant, which is circulated by a pump through a circulating path. The cooling system includes a heat-receiving member disposed in thermal contact with the image forming portion to absorb heat generated by the image forming portion. The heat-receiving member is connected with the circulating path via a joint. The joint is disposed within an enclosed space between the image forming portion and an electrical component drive portion for driving or controlling the image forming portion, so that the image forming portion and the electrical component drive portion can be protected from the coolant in the event of coolant leakage via the joint.

Abstract: An image forming apparatus includes an image carrying member, a transfer unit, a pre-heating unit, a fixing unit, a first temperature sensor, and a first heat controller. The image carrying member carries a toner image. The transfer unit transfers the toner image carried on the image carrying member to a recording medium transported to a transfer position. The pre-heating unit selectively heats the recording medium before the recording medium is transported to the transfer position. The fixing unit fixes the toner image on the recording medium. The first temperature sensor detects temperature of the recording medium as the recording medium passes through the pre-heating unit. The first heat controller changes an amount of heat energy to be applied to the recording medium per unit area of the recording medium by the pre-heating unit. The first heat controller is controlled based on a detection result of the first temperature sensor.

Abstract: In order to form a circulating route of a liquid cooling medium for cooling a temperature rising part of an image forming apparatus, a liquid-cooling type cooling device includes a heat receiving section which causes the liquid cooling medium to absorb heat of the temperature rising part, a radiator which causes the heat of the liquid cooling medium to release, and a pump which circulates the liquid cooling medium. The heat receiving section includes a heat receiving main body in which a flowing route of the liquid cooling medium and a contacting surface for contacting the temperature rising part are formed, and a heat receiving main body covering part which covers outer surfaces other than the contacting surface of the heat receiving main body. The heat receiving main body covering part is formed of a material whose heat conductivity is lower than that of the heat receiving main body.

Abstract: A cooling structure includes driving motors as heat sources, a metal sheet body as a heat transfer member that comes into contact with the driving motors, and a first fan serving as a cooling portion provided oppositely to the metal sheet body in a portion spaced apart from the position at which the driving motors are provided to cool the metal sheet body.

Abstract: A sheet feeding device for feeding a sheet-form recording medium includes: a sheet accommodating portion for accommodating a sheet stack constituted by a plurality of sheets of the sheet-form recording medium; and a first warm air unit having a first blowing port for blowing warm air toward an upper face of the sheet stack accommodated in the sheet accommodating portion. The sheet feeding device preferably further includes a second warm air unit having a second blowing port for blowing warm air onto a side face of the sheet stack that is parallel to a sheet feeding direction.

Abstract: A temperature control system for a roller that is detachably mounted in a frame of an image forming apparatus includes a primary liquid circuit formed in the roller and containing a first liquid and a secondary liquid circuit formed outside of the roller and containing a second liquid. A heat exchanger is arranged to bring the primary and secondary liquid circuits into thermal contact with one another. The heat exchanger includes a first heat exchange member that is in thermal contact with the primary liquid circuit, and a second heat exchange member arranged on the stationary part to be in thermal contact with the secondary liquid circuit. A temperature control device controls the temperature of the second liquid. The first and second heat exchange members form heat transfer surfaces that are opposed to one another to permit heat transfer from one heat exchange member to the other heat exchange member.

Abstract: An image forming apparatus includes a latent image carrier, a latent image forming unit to form an electrostatic latent image on the latent image carrier, at least one developing device disposed to contact the latent image carrier to develop the latent image with developer stored therein, a cooling mechanism including at least one cooling device disposed close to the developing device to cool the developing device, a developer amount detector electrically connected to the developing device to detect an amount of the developer remaining in the developing device, and a cooling mechanism controller connected to the cooling mechanism to change a cooling power of the cooling mechanism according to a detection result generated by the developer amount detector. The developing device includes a rotary member whose shaft is rotationally supported by at least one bearing and is not to be supplied with new developer while any developer remains therein.

Abstract: A reference developing image is formed on a photoreceptor drum under an image forming condition measured in advance, and the density of this reference developing image is detected. A development bias voltage is corrected based on the detection result, and when a correction value of the development bias voltage exceeds a predetermined range, a reference output voltage of an ATC sensor for detecting the density of toner in a developing device is corrected based on the detected value of humidity around the developing device, the frequency of use of the apparatus, and the agitation stress of developer.

Abstract: An image forming apparatus comprising a main body, a cooling device, and a coupling assembly. The cooling device cools a cooling target such as a heat generator, and includes a heat-receiving section forming a heat-receiving-section channel through which a coolant flows to absorb heat from the cooling target, a cooling section to cool the coolant, and a circulation path to circulate the coolant between the heat-receiving section and the cooling section, cooling the coolant at the heat-receiving section, and transporting the coolant back to the heat-receiving section. The cooling target is detachable from the main body together with the heat-receiving section. The cooling section is provided at the main body. The coupling assembly connects the heat-receiving-section channel and the circulation path to circulate the coolant between the heat-receiving section and the cooling section whether with the cooling target installed in or detached from the main body.

Abstract: A developing device according to the present invention includes a developer storing section storing a developer, a stirring member disposed in the developer storing section and transporting the developer while stirring the developer, a developer carrier receiving the developer from the developer storing section and carrying the developer, a developer regulating member regulating the amount of the developer received by the developer carrier from the developer storing section, and a heat-dissipating member disposed at a position in contact with the developer and capable of dissipating heat of the developer. The heat-dissipating member has a surface in contact with the developer and the contact surface of the heat-dissipating member has an arithmetic surface roughness Ra1 that is set to be equal to or less than ? of the volume average particle size of toner particles contained in the developer.

Abstract: An image heating apparatus includes a heating rotatable member for heating a toner image on a recording material at a nip; an axial flow fan for cooling the heating rotatable member at a longitudinal end portion thereof; wherein an axis of the axial flow fan extends from its outlet disposed adjacent the longitudinal end portion inclinedly toward a longitudinally central portion of the heating rotatable member.

Abstract: A cooling apparatus and an image forming device having the cooling apparatus are provided. The cooling apparatus includes an induction opening formed at an outer frame to draw the air into the image forming device, an air duct disposed adjacent to a fixing roller in a longitudinal direction thereof, the fixing roller being heated by a heating source therein, and a blower disposed between the induction opening and the air duct to send the air into the air duct from the induction opening. The cooling apparatus moves the air longitudinally along a jam cover disposed adjacent to the fixing roller, and discharges it to the outside. Accordingly, temperatures in the image forming device and of the components therein can be prevented from overheating and being abnormally increased due to a heat emitted from the heating source.

Abstract: A low-voltage power source circuit board is provided downstream in relation to the flow of air introduced through an intake hole and exhausted by a power source fan. Heat sinks are provided on the low-voltage power source circuit board on electronic parts that generate a large amount of heat, the plate surfaces of the heat sinks being arranged along the direction of airflow, thereby minimizing their resistance to the airflow. Air including heat generated from these electronic parts is exhausted by the power source fan without the air heating the high-voltage power source circuit board or engine circuit board that are disposed upstream in relation to the direction of airflow.

Abstract: An image forming apparatus is constituted by an image bearing member; a corona charging member including a wire; a heat generating member for generating heat by energization; a shielding member, including the heat generating member, capable of shielding a portion of the corona charging member opposing to the image bearing member from the image bearing member by being moved between the corona charging member and the image bearing member; an energization control member for controlling energization of the heat generating member; and moving member for moving the shielding member to a first position at which the shielding member shields the portion and a second position retracted from the first position. When the shielding member is located at the first position, at least a part of the heat generating member is disposed between the corona charging member and the image bearing member.

Abstract: A developing unit for developing an electrostatic latent image formed on the outer peripheral surface of a latent image bearing member rotating in one direction with a developer by mixing electrostatically chargeable toner and magnetic carrier, includes: a developing roller; a carrier collecting roller; a cooling portion including a forced draft duct for airflow from a fan and disposed on the bottom side of the developing vessel; a suctioning portion including a suctioning duct for airflow from suctioning ports disposed on the lower side of the carrier collecting roller, disposed under the forced draft duct; a filter for removing the scattering toner from air including the scattering toner suctioned from the suctioning ports; and, an exhaust portion including an airflow exhaust duct for discharging the air passed through the filter and the forced draft duct to an exhaust port.