An image forming apparatus to which a toner container is detachably mountable includes a mounting portion to which the toner container is detachably mountable and which includes a receiving port for receiving toner supplied from the toner container, a passage for permitting passing of the toner received through the receiving port and provided with a through hole, and a filter portion provided so as to cover the through hole and for permitting passing of air; and an accommodating portion configured to accommodate the toner received through the receiving port. At least a part of the through hole overlaps with the receiving port as viewed in a horizontal direction perpendicular to a direction of gravitation.

A developing cartridge may include a developing roller, a casing capable of containing a developer therein, a developing electrode movable with the casing and the developing roller and pivotable about a developing roller shaft of the developing roller in a direction, a first lever movable relative to the casing, and a holder configured to hold the first lever relative to the casing, in case where the developing electrode pivots from one side of the direction to an other side of the direction, the first lever stops the pivotable movement of the developing electrode from one side of the direction to the other side of the direction and the holder prevents the first lever from coming off the holder from the one side of the direction to the other side of the direction.

An image forming apparatus includes a developer that forms a toner image on an endless belt that is suspended over outer portions of a plurality of rollers, a driver that rotates at least one driving roller out of the plurality of rollers, a position adjustment mechanism that corrects relative positions of the plurality of rollers relative to one another, and a hardware processor, wherein the hardware processor controls the position adjustment mechanism to correct a relative position between the belt and the driving roller with tension applied to the belt being a second tension smaller than a first tension that is applied in a developing state in which a toner image is formed on the belt by the developer.

A developing apparatus includes a developer carrying member configured to carry developer, and a developer supply member configured to supply the developer to the developer carrying member, the developer supply member including a shaft, first and second driving members disposed at a first end and a second end of the shaft, respectively, and a toner supply unit disposed between the first end and the second end of the shaft, wherein the first driving member receives a driving force for rotating the developer supply member, and the second driving member outputs the driving force, and wherein the second driving member is mounted to the shaft without play in a rotational direction of the developer supply member with respect to the shaft.

A developing device includes a developing rotator configured to rotate through a developing region while carrying a magnetic developer, a supply transport member configured to rotate to transport the developer to be supplied to the developing rotator, a non-magnetic movement assist member arranged between the developing rotator and the supply transport member, and having a slope that receives the developer from the supply transport member and moves the developer to the developing rotator, a first adjusting member having a facing surface that faces, with distances, the slope of the movement assist member and a surface of the developing rotator at a part passing over the movement assist member, and configured to adjust a movement amount of the developer from the movement assist member to the developing rotator and a carrying amount of the developer on the surface of the developing rotator, and a second adjusting member having a distance from the surface of the developing rotator at a part passing over the first adjusting member, and configured to adjust the carrying amount of the developer on the surface of the developing rotator before the developer reaches the developing region. A first minimum distance between the slope of the movement assist member and the facing surface of the first adjusting member, a second minimum distance between the facing surface of the first adjusting member and the surface of the developing rotator, and a third minimum distance between the second adjusting member and the surface of the developing rotator are reduced in descending order.

A developing device capable of stably collecting untransferred toner collected from the photoconductor drum to the developing roller to the feed roller and suppressing occurrence of development ghosts, and an image forming apparatus including the same are provided. A developing device has a developing roller facing a photoconductor drum, a feed roller, and a restriction blade. The feed roller forms a feed nip part with the developing roller by contacting with the circumferential surface of the developing roller, and collects toner from the developing roller while feeding the toner to the developing roller. The Asker-C hardness of the developing roller is in the range of 50 to 80, both inclusive, the width of the feed nip part is in the range of 0.2 to 1.5 mm, both inclusive, and a compressive load to be applied to the feed roller is in the range of 0.2 to 1.5N, both inclusive.

The image forming apparatus includes a drum cartridge having a photosensitive drum and a drum drive input member; a developing cartridge configured to be movably mounted to the drum cartridge, the developing cartridge comprising a developing roller disposed so as to face the photosensitive drum and a developing drive input member; a drum drive transmission member configured to engage with the drum drive input member and configured to transmit drum driving force to the drum drive input member while permitting a positional gap of the drum drive input member within a predetermined range; and a developing drive transmission member configured to engage with the developing drive input member and configured to transmit developing driving force to the developing drive input member while permitting a positional gap of the developing drive input member within a predetermined range.

A first contact portion provided on a first shutter member that opens and closes a receiving port for receiving a developer from a cartridge and a second contact portion provided on the cartridge are configured to contact each other in an attachment and detachment direction of the cartridge so that the first shutter member is in a position at which the receiving port is opened. The first shutter member is urged by a first urging member so that a contacting state between the first contact portion and the second contact portion is maintained until a second shutter member that opens and closes a supplying port of the cartridge closes the supplying port when the cartridge is discharged from the apparatus body.

Provided is an electrophotographic electro-conductive member including a support having an electro-conductive outer surface, and an electro-conductive layer. The electro-conductive layer has a matrix containing a crosslinked product of a first rubber and domains containing a crosslinked product of a second rubber and an electron conductive agent. When measuring an impedance by applying alternating voltage between the outer surface of the support and a platinum electrode on an outer surface of the electro-conductive layer while changing a frequency, a slope at specific frequencies is −0.8 to −0.3 in a double logarithmic plot, and an impedance at specific frequency range is 1.0×10.sup.4Ω to 1.0×10.sup.11Ω. When measuring an impedance by applying alternating voltage between the outer surface of the support and a platinum electrode on an outer surface of the electrophotographic electro-conductive member while changing a frequency, an impedance at specific frequency range is 1.0×10.sup.5Ω to 1.0×10.sup.11Ω.

A cartridge includes a frame and a developing roller for developing a latent image on the electrophotographic photosensitive drum. The cartridge also includes a coupling member having a rotational force receiving portion to receive a rotational force to be transmitted to the developing roller. First and second force receiving portions are provided on the frame. The coupling member is movable relative to the roller axis between a first position in which the coupling axis is substantially parallel to the roller axis and a second position different from the first position.