A developer supply container detachably mountable to a developer receiving apparatus and settable in a developer receiving apparatus by a setting operation including at least a rotation toward a setting position, includes a containing portion for containing the developer; a rotatable discharging member for discharging the developer out of said containing portion; drive transmitting means, engageable with a driving gear provided in said developer receiving apparatus and rotatable in a direction opposite the setting direction, for transmitting a rotating force from said driving gear to said discharging member.

A toner container includes a toner accommodating portion, a discharge portion, a shutter, a sealing member, and a guiding portion. In a case where a direction from the toner accommodating portion toward the discharge portion in a rotational axis direction is a first direction, where a direction opposite to the first direction is a second direction, and where an end portion of the sealing member on a downstream side of the first direction is a first end portion, a downstream end portion of the guiding portion is positioned downstream of the first end portion of the sealing member with respect to the first direction. The downstream end portion of the guiding portion overlaps with the sealing member as viewed in the rotational axis direction, and includes an inclined surface inclined so as to approach the contact surface of the seal member as it goes in the second direction.

A toner case includes a case main body, a cover, and a seal member. The case main body is configured to contain a toner and to rotate. The cover is configured to cover an opening part arranged at the case main body and to maintain a rotation stop state when the case main body rotates. The seal member is interposed between the case main body and the cover and configured to maintain a rotation stop state when the case main body rotates. At least a part of the seal member is composed of an elastic material.

A toner case includes a case main body, a transmission member, and a cover. The case main body contains a toner and rotates around a rotation axis line. The transmission member is attached to an outer circumferential face of the case main body and configured to transmit rotation driving force to the case main body. The cover is configured to cover an opening part arranged at the case main body. The case main body includes a rotation restricting part and a movement restricting part. The rotation restricting part is configured to restrict a rotation of the transmission member with respect to the case main body. The movement restricting part is configured to restrict a movement in a direction of the rotation axis line of the transmission member with respect to the case main body. The transmission member is positioned between the cover and the movement restricting part.

A toner case includes a case main body, a cover, and an agitating member. The case main body is configured to contain a toner and to rotate. The cover is configured to cover an opening part arranged at the case main body and to maintain a rotation stop state when the case main body rotates, the cover having a communication space which communicates with an inside space of the case main body via the opening part. The agitating member is configured to rotate integrally with the case main body and to agitate the toner in the communication space.

In a case where a developer bottle is not attached to a bottle attachment portion, a movable support portion is kept to be at a support position, by an elastic force of a second spring, at which to support the bottle attachment portion to be higher than a reference level in position. In a case where the developer bottle is attached to the bottle attachment portion, a movable arm portion extending from the movable support portion toward an attachment space contacts the developer bottle and is displaced to outside the attachment space, which causes the movable support portion to be displaced from the support position to a release position at which to release a support of the bottle attachment portion. A control portion prohibits an image forming process when the position of the bottle attachment portion is not equal to or lower than the reference level.

An image forming apparatus includes a developing unit configured to develop using toner an electrostatic latent image formed on a photosensitive member, a mounting unit to which a container is mounted, the container including a containing unit configured to contain toner and a pump unit, and performing a supplying operation for supplying toner by expansion and contraction of the pump unit, a driving unit configured to rotationally drive the container to cause the container to perform the supplying operation, and a controller configured to control a rotational speed of the container based on a time for which the supplying operation has been performed.

A developer supply container 1 includes a cylindrical portion 2k capable of accommodating a developer; a second discharge opening 4a, provided on the cylindrical portion 2k, for permitting discharge of the developer; a storage portion 4d provided in the cylindrical portion 2k and capable of storing a predetermined amount of the developer through the second discharge opening 4a; a pump portion 3a having a changeable inside volume of cylindrical portion 2k in a longitudinal direction of the supply container 1 to apply a pressure at least to the second discharge opening 4a; a fluid communication path 20a providing fluid communication between the pump portion 3a and the storage portion 4d; and a partition 20 provided in a connecting portion between the pump portion 3a and the fluid communication path 20a for suppressing flow of the air which is produced by pump portion 3a and which is directed to toward cylindrical portion 2k at least in a discharging operation.

The powder container includes a container body containing a powder for image formation, the powder being to be supplied to a powder replenishing device; a conveyor configured to convey the powder from one end in a longitudinal direction to the other end at which a cylindrical container opening is formed, the conveyor being provided inside the container body; a gear configured to rotate the conveyor with an external driving force; a container cover configured to cover the gear, the container cover having a gear exposing hole for partially exposing a gear tooth; and a nozzle receiver configured to guide the conveying nozzle inside of the container body, the nozzle receiver being provided on the container opening. The container cover includes a container engaged portion provided outer than the tooth of the gear in a radial direction.

A toner container includes a container body, an opening, a cover, a toner discharge port, a shutter, a cylindrical structure, protrusions, and an identifier. The shutter is attached to the cover and includes a main shutter covering the toner discharge port. The main shutter moves between a closed position to close the toner discharge port and an open position to open the toner discharge port. The protrusions are on both sides of the cover and protrude in a direction orthogonal to a toner container mounting direction. The identifier is on the cover to indicate a toner color. The cylindrical structure's leading end is downstream of leading ends of the protrusions in the mounting direction. The main shutter's leading end is downstream of the protrusions' leading ends in the mounting direction when the main shutter is in the closed position. The protrusions are downstream of the identifier in the mounting direction.