An image forming apparatus includes: a detection unit configured to detect an amount of developer stored in a developing container and to output remaining amount information; and a control unit configured to perform control, during a replenishment of the developer to the developing container using, a replenishment container, to cause a display unit to display a message related to the replenishment. When the replenishment is instructed, the control unit is further configured to perform a first control during the replenishment in a case where the remaining amount information indicates a first remaining amount, and configured to perform a second control different from the first control during the replenishment in a case where the remaining amount information indicates a second remaining amount greater than the first remaining amount.

A tie attachment assembly, including a first layer including a first surface and a second surface, the first surface including an adhesive, a fold line, and a second layer, including a third surface, a fourth surface connected to the first surface, a first cutout arranged on a first side of the fold line, and a second cutout arranged on a second side of the fold line, opposite the first side.

A tie attachment assembly, including a first layer including a first surface and a second surface, the first surface including an adhesive, a fold line, a second layer, including a third surface, a fourth surface connected to the first surface, a first cutout arranged on a first side of the fold line, and a second cutout arranged on a second side of the fold line, opposite the first side.

A tie attachment assembly, including a first layer including a first surface and a second surface, the first surface including an adhesive, a fold line, a second layer, including a third surface, a fourth surface connected to the first surface, a first cutout arranged on a first side of the fold line, and a second cutout arranged on a second side of the fold line, opposite the first side.

Provided is an image forming unit contained in a flexible bag and held to allow a cushion member to absorb shock. The image forming unit includes: an image carrier on which an electrostatic latent image is formed; a developing device including a developing unit that is configured to develop the electrostatic latent image by turning around a turning center and coming into contact with the image carrier; and a developer accommodating portion that accommodates a developer for use in the developing device. The image forming unit also includes a restricting portion that is provided on an outermost portion of the developing device to come into contact with the cushion material so that rotation of the developing device is restricted.

An image forming apparatus includes: a detection unit configured to detect an amount of developer stored in a developing container and to output remaining amount information; and a control unit configured to perform control, during a replenishment of the developer to the developing container using a replenishment container, to cause a display unit to display a message related to the replenishment. When the replenishment is instructed, the control unit is further configured to perform a first control during the replenishment in a case where the remaining amount information indicates a first remaining amount, and configured to perform a second control different from the first control during the replenishment in a case where the remaining amount information indicates a second remaining amount greater than the first remaining amount.

A developer accommodating unit for accommodating a developer for image formation includes a flexible container provided with an opening 35a for permitting discharge of the developer, a frame for accommodating the flexible container and for accommodating the developer to be discharged from the flexible container, and an urging member 21 for urging a developer accommodating bag toward the frame for accommodating the developer accommodating bag 16. By this, it is possible to satisfactorily effect discharge of the developer from the flexible developer accommodating bag 16.

A pump portion 21 which is variable in volume, a feeding path portion 24 including a connection opening connected to the pump portion 21 at one end and including a discharge opening 23 at the other end, and a toner accommodating portion 22 connected to an intermediate portion between the one end and the other end of the feeding path portion 24 and for accommodating the toner are provided, and a volume change amount of the pump portion 21 is larger than a total volume from the connection opening to the discharge opening 23 of the feeding path portion 24.

An image forming system includes a toner container and an image forming apparatus to which the toner container is mountable. The toner container includes a projection that includes an inner peripheral surface centered on a central axis of the toner container. When the toner container is oriented in a predetermined direction, the projection has a downward guide surface facing downward and an upward guide surface facing upward. When the toner container is moved downward in a direction of the central axis toward a mounting portion of the image forming apparatus, (i) the downward guide surface is configured to guide a guided member of the image forming apparatus so that the guided member is rotated in a rotational direction about the central axis, and (ii) the upward guide surface is configured to guide the guided member so that the guided member is moved up after the guided member is rotated in the rotational direction by the downward guide surface.

An image forming apparatus includes a first unit including an image bearing member and a second unit. The second unit includes a developing roller to supply the toner to the image bearing member, a mounting portion in which the replenishing container is dismountably mounted and an accommodating portion to accommodate the toner replenished from the replenishing container. The second unit is movable between a first position where the developing roller contacts the image bearing member and a second position where the developing roller separates from the image bearing member. When a moving direction in which the second unit moves from the first position toward the second position is defined as a separating direction, the second unit is urged in the separating direction by a force which the mounting portion receives from the replenishing container when the replenishing container is mounted to the mounting portion.