There are provided a rotatable developer accommodating portion accommodating a developer, a discharge end portion provided at a bottom side with a discharge opening for discharging the developer accommodated in the developer accommodating portion, an engaging portion 30 engageable with a portion-to-be-engaged 11b with a mounting operation of the developer supply container 1 to displace the portion-to-be-engaged 11b in an upward direction U to bring the receiving opening into fluid communication with the discharge opening, and a swing shaft 41 rotatably supporting engaging portion 30 provided at such a position that opposite end portions of the engaging portion 30 a rotatable.

A toner cartridge according to one example embodiment includes a reservoir for holding toner. An outlet is positioned on a front of the toner cartridge for exiting toner from the toner cartridge. First, second and third electrical contacts are positioned on a first side of the toner cartridge for contacting corresponding first, second and third electrical contacts in an image forming device. Each of the first, second and third electrical contacts of the toner cartridge is electrically connected to a respective imaging component positioned on the toner cartridge. The first, second and third electrical contacts of the toner cartridge are positioned such that an imaginary line that angles downward in a direction from a rear of the toner cartridge toward the front of the toner cartridge passes through the first, second and third electrical contacts of the toner cartridge.

A developing device is detachably supported by an image forming apparatus. The developing device includes a housing that can store developer inside the housing, at least one rotating member rotatably provided for the housing, a first support shaft composed of a conductive member and disposed at an axial end of the rotating member, and a support member including a first bearing portion that supports the first support shaft and constituting a side face of the housing in an axial direction of the rotating member. The first bearing portion includes a first guide portion. The first guide portion protrudes outward from an outer surface of the support member and configured to be guided to an installation position of the developing device during installation of the developing device in the image forming apparatus.

In a cartridge, a housing has a developer accommodating portion and includes a first side wall and a second side wall. A coupling member is disposed at a position opposite to the developer accommodating portion with respect to the first side wall. A detection body is disposed at a position opposite to the developer accommodating portion with respect to the second side wall. A first driving force transmission member is positioned at the same side with the coupling member with respect to the first side wall, and transmits driving force from the coupling member to a rotating member. A second driving force transmission member is positioned at the same side with the detection body with respect to the second side wall, and transmits driving force from the rotating member to the detection body.

An image forming apparatus includes a developing device, a drum unit, a side plate, a notch, a turning member and a biasing member. The developing device includes a developing roller. The drum unit includes a photosensitive drum and has a protrusion protruding in an axial direction of the photosensitive drum. Thea side plate faces an end surface of the drum unit in the axial direction. The notch is provided in the side plate. The turning member is capable of turning in a direction protruding into the notch and in a direction separating from the notch. The biasing member biases the turning member in a direction close to the notch. The turning member is pushed back by the protrusion inserted into the notch from above, and when the protrusion reaches a bottom of the notch, the turning member presses the protrusion against the notch by a load containing a downward component.

An image forming apparatus is capable of being attached with a toner supply container. The toner supply container stores a toner that is to be supplied to a developing portion. An attachment location of the toner supply container is below a light scanning portion in a vertical direction.

A developer supplying apparatus includes an attaching portion, an antenna, and a positional relationship changing portion. A developer storage portion including a wireless tag is attached to the attaching portion. The antenna is used for performing wireless communication with the wireless tag of the developer storage portion attached to the attaching portion using a radio wave method. The positional relationship changing portion changes a positional relationship between the wireless tag and the antenna.

The developing cartridge includes a casing, a developing roller, and a first inclined surface. The first inclined surface is positioned at an outer surface of one end portion of the casing in the second direction. The first inclined surface is fixed to the casing and is inclined relative to the first direction. The first inclined surface is movable in the first direction relative to the photosensitive drum between a first position and a second position together with the casing and the developing roller in a state where the developing cartridge 1 is attached to a drum cartridge. In a state where the first inclined surface is at the first position, the developing roller is in contact with the photosensitive drum. In a state where the first inclined surface is at the second position, the developing roller is in separation from the photosensitive drum.

An image forming apparatus includes a first body, an image forming portion, a first conveying passage provided inside of the first body and to convey toner discharged from the image forming portion, a second body detachably connected to the first body, and a second conveying passage to convey the toner received from the first conveying passage. The second conveying passage receives the toner from the first conveying passage in the first body. The second conveying passage is projected from the first body into the second body when the second body is connected to the first body, and is detachable from the first body while leaving the first conveying passage in the first body.

A cartridge includes a photosensitive drum having a rotational axis about which the photosensitive drum is rotatable, a developing roller having a rotational axis about which the developing roller is rotatable, and a casing rotatably supporting the photosensitive drum and the developing roller. The coupling member is operatively connected to the photosensitive drum, with the coupling member including at least one projection capable of receiving a rotational force to rotate the photosensitive drum. A spring is provided with a movable part that is movable relative to the casing in a direction away from the rotational axis of the developing roller to urge the coupling member so that at least the projection of the coupling member moves away from the rotational axis of the developing roller.