A developing device includes a rotatable developing member, a resin-made regulating blade, and a resin-made developing device frame including at least a mounting portion. The regulating blade is fixed, in a state that the regulating blade is flexed, in a region of the mounting portion corresponding to a maximum image region of an image bearing member so that a gap between the rotatable developing member and the regulating blade falls within a predetermined range over a rotational axis direction of the rotatable developing member. The mounting portion is provided with a rib which includes a portion projecting from the mounting portion and extending along a direction parallel to the rotational axis direction of the rotatable developing member and which is formed over an entirety of a region of the mounting portion corresponding to the maximum image region of the image bearing member.

An image forming apparatus includes a rotatable image bearing member and a rotatable developing member to carry developer made up of toner particles and carrier particles adhered to surfaces of the toner particles. Where a pressing force pressing the developing member against the image bearing member is F1, a total number of the carrier particles interposed between the toner particles and the image bearing member is N1, and an adhesion Ft between a carrier particle and a toner particle, measured when the carrier particle is pressed against the toner particle with F1/N1 that is a pressing force per unit carrier particle, and an adhesion Fdr1 between the carrier particle and the image bearing member, measured when the carrier particle is pressed against the image bearing member with F1/N1, satisfy Ft?Fdr1.

An image forming apparatus includes an apparatus main body, an image bearing member unit, a transfer member, a supporting member, and a positioning member. The image bearing member unit and the transfer member are disposed attachable to and detachable from the apparatus main body. The supporting member includes a to-be-contacted portion configured to be in contact with a to-contact portion of the image bearing member unit. The to-be-contacted portion is movable from a first position to a second position by an attachment operation of the image bearing member unit to the apparatus main body, where the first position is a position to be in contact with the to-contact portion, the second position is a position different from the first position, and the second position is a position at which the supporting member is supported by the positioning member and the to-be-contacted portion is out of contact with the to-contact portion.

An image forming apparatus includes a main body housing and a process cartridge demountable from the main-body housing. The process cartridge includes a drum cartridge and a toner cartridge. The drum cartridge includes a photosensitive drum, a drum cleaner, an outlet with an outlet opening, an outlet shutter, and a lever. The lever is pivotable between a first position at which the lever places the outlet shutter closing the outlet opening and a second position at which the lever places the outlet shutter opening the outlet opening. When the lever is located at the first position, the process cartridge is demountable from the main-body housing. When the lever is located at the second position, the process cartridge is disabled to be demounted from the main-body housing.

An image forming apparatus includes a driving unit configured to apply a driving force to a photosensitive drum, in which the driving unit includes a first driving frame hold a shaft joint side of a driving gear, a second driving frame hold a side opposite to the shaft joint side of the driving gear and be located coaxially with the first through-hole, a first driving frame wall portion extend in an axial direction of the driving gear toward the second driving frame, and a second driving frame wall portion extend in the axial direction toward the first driving frame, and an elastic member is compressed and held in a gap between the first driving frame wall portion and the second driving frame wall portion.

An image-forming device includes a main casing, a belt accommodated in the main casing, developing units arranged along the belt, a drawer configured to detachably support the developing units, the drawer configured to move to a position inside the main casing and to a position outside the main casing, and the drawer having a leading end and a trailing end in a pulling direction from the inside position to the outside position; and a guide configured to guide the drawer and to move between a first position and a second position when the drawer is at the inside position, the second position being farther from the belt than the first position from the belt. When the guide is at the second position, the guide is configured to be tilted downward relative to a horizontal direction such that the leading end is lower than the trailing end.

An apparatus includes an opening/closing member that opens/closes space which is provided in an apparatus body and in which a first unit and a second unit are accommodated; a first guide portion that guides the first unit in the space; a second guide portion that guides the second unit in the space; and a slope member that is capable of guiding the first unit to the first guide portion provided at a position higher than a position of the second guide portion in a height direction orthogonal to an inserting/extracting direction of the space when the opening/closing member is put in an open position, the slope member being coupled between the apparatus body and the opening/closing member so as to be positioned in the space when the opening/closing member is put in a closed position to close the space.

An image forming apparatus includes a main body, an upper unit, and a moving mechanism. The main body includes an image forming section. The image forming section forms an image on paper. The upper unit is disposed in an upper portion of the main body. The moving mechanism moves the upper unit to a first position and to a second position. The first position of the upper unit is above a position of the image forming section in the upper portion of the main body. The second position of the upper unit is in the upper portion of the main body and is different from the first position.

An image forming apparatus includes a developing unit. The developing unit includes a developing mechanism, a photoconductor drum, a cleaner unit, a charging unit, and a development housing. The developing mechanism includes a developing roller. The development housing forms a developer tank that has an elongated substantially-box-shape extending in the front-back direction. The developer tank contains a developer, and a toner included in the developer is supplied to the photoconductor drum via the developing roller. The photoconductor drum, the cleaner unit, the charging unit, and a housing cover are each attachable to and detachable from the development housing.

An image forming apparatus includes an apparatus body including an image bearing member configured to bear a toner image, a transfer unit including a transfer portion configured to transfer the toner image borne on the image bearing member onto a sheet, the transfer unit being pivotably supported with respect to the apparatus body, an opening/closing unit disposed at a position farther from the apparatus body than the transfer unit is, and openably and closably supported with respect to the apparatus body, and a positioning portion pivotably supported with respect to the apparatus body and configured to position the transfer unit with respect to the apparatus body. The positioning portion is entirely disposed further on an outer side in the apparatus body than a pivot center of the transfer unit in a horizontal direction.