Abstract: An image forming apparatus includes a housing in which an exhaust port is formed, a fan, a duct extending in an exhausting direction and configured to accommodate the fan, the duct including a downstream end in the exhausting direction, and an exhaust filter disposed between the duct and the exhaust port in the exhausting direction, the exhaust filter including a first surface facing the exhaust port and a second surface facing the duct. Dimensions of the duct each orthogonal to the exhausting direction are smaller than dimensions of the exhaust filter each orthogonal to the exhausting directions. A perimeter of the downstream end of the duct in the exhausting direction is in contact with the second surface of the exhaust filter.

Abstract: An image forming apparatus includes: a motor; a temperature detector; a conveyor; a sheet detector; and a controller configured to perform: (a) controlling a conveying speed of the sheet; (b) determining whether a paper jam has occurred; and (c) determining, when the paper jam has occurred, whether a torque shortage has occurred. The torque shortage is shortage of a torque occurring during conveyance of the sheet. When the torque shortage has occurred, and the paper jam is resolved and conveyance of the sheet is resumed, the controller performs in the (a) controlling: controlling, when an ambient temperature detected by the temperature detector is higher than a predetermined temperature, the conveying speed to become a first conveying speed; and controlling, when the ambient temperature is lower than or equal to the predetermined temperature, the conveying speed to become a second conveying speed slower than the first conveying speed.

Abstract: An image forming apparatus including a main body casing, a cover, a drum cartridge, a developing cartridge, an intermediate transfer belt and a movable cam. The movable cam is movable among a first position when the cover is in the open position, a second positon and a third position when the cover is in the closed position. In a case where the movable cam is in the first position, the photosensitive drum is in a first drum position spaced from the intermediate transfer belt, and the developing roller is in a first developing position spaced from the photosensitive drum. In a case where the movable cam is in the second position, the photosensitive drum is positioned toward the the intermediate transfer belt from the first drum position. In a case where the cam is in the third position, the developing roller is positioned toward the photosensitive drum from the first developing position.

Abstract: An image forming apparatus, having a cartridge and a main body, is provided. The cartridge has a cartridge-side coupling to transmit a driving force to a drivable member in the cartridge. The cartridge is detachably attached to the main body. The main body includes a body-side coupling movable between a connecting position, at which the body-side coupling is connected with the cartridge-side coupling, and a separated position, at which the body-side coupling is separated from the cartridge-side coupling; a joint cam movable between a first position, at which the joint cam locates the body-side coupling at the connecting position, and a second position, at which the joint cam locates the body-side coupling at the separated position; and a rotator having a dent. The dent allows entry of an end portion of the joint cam there-into when the joint cam is located at the first position.

Abstract: An image forming apparatus including a main body casing, a cover, a drum cartridge, a developing cartridge, an intermediate transfer belt and a movable cam. The movable cam is movable among a first position when the cover is in the open position, a second position and a third position when the cover is in the closed position. In a case where the movable cam is in the first position, the photosensitive drum is in a first drum position spaced from the intermediate transfer belt, and the developing roller is in a first developing position spaced from the photosensitive drum. In a case where the movable cam is in the second position, the photosensitive drum is positioned toward the intermediate transfer belt from the first drum position. In a case where the cam is in the third position, the developing roller is positioned toward the photosensitive drum from the first developing position.

Abstract: An electrostatic charge image developing toner has toner particles that contain a binder resin, a release agent, and resin particles, in which a loss coefficient tan ? (1%) of the resin particles at a melting temperature Tw of the release agent and a strain of 1% and a loss coefficient tan ? (100%) of the resin particles at the melting temperature Tw of the release agent and a strain of 100% satisfy the following Expression (1) and the following Expression (2). 0.02?tan ?(1%)?0.5??Expression (1): 0.4?tan ?(100%)?tan ?(1%)?2.

Abstract: An electrostatic charge image developing toner contains toner particles that contain a binder resin and resin particles and an external additive that contains inorganic particles, in which a loss coefficient tan?a of the resin particles at 40° C. and 0.1 rad/s satisfies 0.1 < tan?a < 1.0, a loss coefficient tan?b of the resin particles at 40° C. and 10 rad/s satisfies 1.3 < tan?b < 3.0, and in a case where a strain of 0.005% is applied to the toner at 40° C., a stress relaxation time ? of the toner satisfies 5 seconds < ? < 500 seconds.

Abstract: A method of producing resin particles includes a first step of adding a monomer-containing emulsified liquid that contains a polymerizable monomer and an aqueous medium to an aqueous mother medium to polymerize the polymerizable monomer; and a second step of adding an aqueous medium for cooling to the aqueous mother medium after completion of the addition of the monomer-containing emulsified liquid to the aqueous mother medium.

Abstract: A toner for developing an electrostatic charge image incorporates toner particles that contain binder resins including an amorphous polyester resin and a crystalline polyester resin, an ester-based release agent, and a polycondensate of a styrene-acrylic resin and a polyolefin resin. The polycondensate of styrene-acrylic and polyolefin resins has a storage modulus G?SP (70) at 70° C. of 1×104 Pa or more and 1×107 Pa or less and a storage modulus G?SP (90) at 90° C. of 1×103 Pa or more and 1×106 Pa or less in dynamic rheometry. The toner particles have a storage modulus G?T (70) at 70° C. of 1×104 Pa or more and 1×106 Pa or less and a storage modulus G?T (90) at 90° C. of 1×103 Pa or more and 1×105 Pa or less in dynamic rheometry.

Abstract: An electrostatic charge image developing toner that has a binder resin that contains a crystalline resin and toner particles that contain resin particles, in which a loss coefficient tan ?S (30) at 30° C. of the resin particles is 1 or more, and a loss coefficient tan ?S (50) at 50° C. of the resin particles is less than 1.

Abstract: A toner for developing an electrostatic charge image incorporates toner particles that contain binder resins, in which: the binder resins include amorphous resins and at least one crystalline resin, the amorphous resins including amorphous resin a1 and amorphous resin a2, the crystalline resin including crystalline resin cl; and 10,000?Mw(a2)?Mw(a1)?150,000??(1), and |SP(a1)?SP(c1)|/|SP(a2)?SP(c1)|?0.9??(2), where Mw (al) is the weight-average molecular weight of amorphous resin a1, Mw (a2) is that of amorphous resin a2, SP (a1) is the solubility parameter (SP) of amorphous resin a1, SP (a2) is that of amorphous resin a2, and SP (c1) is that of crystalline resin c1.

Abstract: An image forming apparatus includes: a motor; a temperature detector; a conveyor; a sheet detector; and a controller configured to perform: (a) controlling a conveying speed of the sheet; (b) determining whether a paper jam has occurred; and (c) determining, when the paper jam has occurred, whether a torque shortage has occurred. The torque shortage is shortage of a torque occurring during conveyance of the sheet. When the torque shortage has occurred, and the paper jam is resolved and conveyance of the sheet is resumed, the controller performs in the (a) controlling: controlling, when an ambient temperature detected by the temperature detector is higher than a predetermined temperature, the conveying speed to become a first conveying speed; and controlling, when the ambient temperature is lower than or equal to the predetermined temperature, the conveying speed to become a second conveying speed slower than the first conveying speed.

Abstract: A toner for developing an electrostatic charge image contains toner particles containing an amorphous resin and a crystalline resin. The ratio Qs1/Qf1 is 1.1 or more and 2.0 or less, where Qf1 is the total area of all endothermic peaks detected during the first temperature rise when the toner particles are analyzed by differential scanning calorimetry after one-day storage under 50° C. conditions, and Qs1 is the total area of all endothermic peaks detected during the first temperature rise when classified toner particles are analyzed by differential scanning calorimetry after one-day storage under 50° C. conditions. The classified toner particles are a fraction of the toner particles in which toner particles having a diameter equal to or larger than the volume-average diameter D50v of the toner particles constitute 10% by number or less.

Abstract: A toner for developing an electrostatic charge image contains toner particles including first toner particles and second toner particles, the first toner particles having a brightness of less than 90 and the second toner particles having a brightness of 90 or more. The second toner particles constitute 0.1% by number or more and 10% by number or less of the toner particles, and, in the size distribution of the second toner particles, toner particles having a diameter equal to or smaller than the number-average diameter Dn of the toner particles constitute 70% by number or more.

Abstract: A toner for developing an electrostatic charge image contains toner particles that contain binder resins including an amorphous resin and a crystalline resin and also contain an oligomer. The molecular weight distribution curve of the toner measured by gel permeation chromatography has its highest peak in a range of molecular weights from 5000 to 50000 and a peak or shoulder in a range of molecular weights from 500 to 5000. In a cross-sectional observation of the toner particles, domains of the crystalline resin have an average length of major axis of 100 nm or more and 1000 nm or less.

Abstract: An image forming apparatus, having a first developing roller, a second developing roller, a third developing roller, a fourth developing roller, a first photosensitive drum, a second photosensitive drum, a third photosensitive drum, a fourth photosensitive drum, a motor, a first output gear, a first gear train, and a second gear train, is provided. The first output gear is arranged coaxially with the motor and outputs a driving force from the motor. The first gear train includes a first intermediate gear meshing with the first output gear and transmits the driving force from the motor through the first output gear to the first, second, third, and fourth developing rollers. The second gear train includes a second intermediate gear meshing with the first output gear and transmits the driving force from the motor through the first output gear to the first, second, third, and fourth photosensitive drums.

Abstract: An image forming apparatus, having a first developing roller, a second developing roller, a third developing roller, a fourth developing roller, a first photosensitive drum, a second photosensitive drum, a third photosensitive drum, a fourth photosensitive drum, a motor, a first output gear, a first gear train, and a second gear train, is provided. The first output gear is arranged coaxially with the motor and outputs a driving force from the motor. The first gear train includes a first intermediate gear meshing with the first output gear and transmits the driving force from the motor through the first output gear to the first, second, third, and fourth developing rollers. The second gear train includes a second intermediate gear meshing with the first output gear and transmits the driving force from the motor through the first output gear to the first, second, third, and fourth photosensitive drums.

Abstract: An image forming apparatus including a main body casing, a cover, a drum cartridge, a developing cartridge, an intermediate transfer belt and a movable cam. The movable cam is movable among a first position when the cover is in the open position, a second positon and a third position when the cover is in the closed position. In a case where the movable cam is in the first position, the photosensitive drum is in a first drum position spaced from the intermediate transfer belt, and the developing roller is in a first developing position spaced from the photosensitive drum. In a case where the movable cam is in the second position, the photosensitive drum is positioned toward the the intermediate transfer belt from the first drum position. In a case where the cam is in the third position, the developing roller is positioned toward the photosensitive drum from the first developing position.

Abstract: An image forming apparatus including a main body casing, a cover, a drum cartridge, a developing cartridge, an intermediate transfer belt and a movable cam. The movable cam is movable among a first position when the cover is in the open position, a second position and a third position when the cover is in the closed position. In a case where the movable cam is in the first position, the photosensitive drum is in a first drum position spaced from the intermediate transfer belt, and the developing roller is in a first developing position spaced from the photosensitive drum. In a case where the movable cam is in the second position, the photosensitive drum is positioned toward the intermediate transfer belt from the first drum position. In a case where the cam is in the third position, the developing roller is positioned toward the photosensitive drum from the first developing position.

Abstract: A toner for developing an electrostatic charge image includes toner particles containing a binder resin; and an external additive containing silica particles, in which a coefficient of variation of a Si content is determined by determining the Si content in 0.5 ?m×0.5 ?m square regions in a surface of each of the toner particles after performing a process of dispersing the toner in water and drying the dispersed toner, and an amount of change between this coefficient of variation of the Si content and a coefficient of variation of a Si content before the process ((coefficient of variation of Si content after process)?(coefficient of variation of Si content before process)) is 0.05 or more and 0.60 or less.