A cartridge includes a shutter that opens and closes when the cartridge is attached and detached to a developing unit or image forming apparatus. The cartridge includes a casing having a chamber with a first opening at one end portion allowing toner to flow out of the casing. The cartridge includes a cover that covers the first opening, movable with the casing and having a second opening allowing toner to flow out of the cover. The shutter is located at the one end portion and has a protrusion further from the one end portion than the cover. The developing unit supports the protrusion when the cartridge is mounted thereon, and the casing pivots with the cover relative to the developing unit between a first position where the shutter closes the second opening and a second position where a third opening of the shutter overlaps the second opening.

A powder container includes a powder container body having a cylindrical form to store powder. The powder container body includes a conveyer, a large diameter portion, a small diameter portion, and a boundary portion. The conveyer conveys the powder stored in the powder container body in a longitudinal direction of the powder container body. The large outer diameter portion has an outer diameter on a cross section orthogonal to the longitudinal direction. The small outer diameter portion has an outer diameter smaller than the outer diameter of the large outer diameter portion on the cross section. The boundary portion connects the large outer diameter portion and the small outer diameter portion.

A developer storage container includes a storage portion, a communication portion, a scooping portion, and a guide portion. The storage portion conveys developer stored therein in a conveying direction along a rotation axis by being rotated around the rotation axis in a specific direction. The communication portion connects the storage portion to an opening portion facing the conveying direction. The scooping portion includes a scooping surface facing the specific direction at an end of the storage portion on a downstream side in the conveying direction and radially outside the communication portion to scoop up the developer in contact with the scooping surface as the storage portion rotates. The guide portion lies radially inside the scooping portion to be contiguous with the scooping surface and an inner peripheral surface of the communication portion, and guides the developer scooped up by the scooping portion to the communication portion.

An image forming device may comprise: an attaching unit to which a removable toner bottle is attached; a toner storage that stores toner supplied from the toner bottle attached to the attaching unit; a detector that detects an empty state of toner in the toner storage; and a hardware processor that: supplies toner to the toner storage from the toner bottle when the toner bottle attached to the attaching unit is new; and switches a state of the toner bottle to an old state from a new state if the empty state detected by the detector is released.

A process cartridge mountable on an image forming apparatus includes a photoconductive drum, a developing unit including a developing roller and a toner storage unit. The toner storage includes a first toner storage chamber, a second toner storage chamber located above the first toner storage chamber, a first toner conveying member located in the first toner storage chamber and configured to convey the toner in the first toner storage chamber upward toward the second toner storage chamber in an area wider than the toner discharge outlet in the first direction, and a second toner conveying member located in the second toner storage chamber and configured to convey, in the first direction, the toner in the second toner storage chamber toward the toner discharge outlet.

A toner cartridge includes a casing accommodating toner and provided with a toner discharge opening, a fan, a closing member capable of shifting between a closed position and an open position for opening a passage. The toner cartridge also includes a drive receiving member for receiving a driving force from outside of the toner cartridge and for transmitting the driving force toward the fan and the closing member by rotation thereof. The closing member periodically moves between the closed position and the open position by receiving the driving force.

An attached portion of an image forming apparatus includes a rotating member of which at least a part is exposed outside the image forming apparatus when the developer container is attached, and a rotation restricting mechanism that is movable between a restricting position to restrict rotation of the rotating member and an allowable position to allow rotation of the rotating member, and includes a restricting member that is at the restricting position when the developer container is not attached. The developer container is attached to the attached portion so that the discharging portion engaging portion and the shutter engaging portions are engaged with the frame engaged portions and the rotating member engaged portions respectively when the container shutter is in the close state, and the restricting member moves from the restricting position to the allowable position when the developer container is attached to the attached portion.

An image forming device may comprise: an attaching unit to which a removable toner bottle is attached; a toner storage that stores toner supplied from the toner bottle attached to the attaching unit; a detector that detects an empty state of toner in the toner storage; and a hardware processor that: supplies toner to the toner storage from the toner bottle when the toner bottle attached to the attaching unit is new; and switches a state of the toner bottle to an old state from a new state if the empty state detected by the detector is released.

A pressurization device for a toner cartridge includes an inner cover (200), an airbag (400) and a sliding member (500). The inner cover (200) is arranged at a toner feeding port (110) of the toner cartridge (100); the airbag (400) is made of elastic material; the airbag (400) includes a fixed end that is fixed to the inner cover (200) and a free end that extends outward from the fixed end; the fixed end is provided with an airbag opening (410) interconnected to an interior of the toner cartridge (100); a remaining portion of the airbag (400) is arranged as closed except for the airbag opening (410); a first end of the sliding member (500) is connected to the free end of the airbag (400) and moves toward the fixed end of the airbag (400) back and forth, so that the airbag (400) ejects gas into the toner cartridge (100) by means of being compressed. Through compressing the airbag (400), high-pressure gas is continuously ejected into the toner cartridge (100), and toner is mixed with gas to be ejected together from a toner outlet at a front end of the toner cartridge (100), so that fluidity of the ejected toner is improved, problems such as easy compacting and clumping of the toner at the toner outlet and inside each toner flowing passage of the printing device are eliminated, and a blockage due to accumulation is effectively prevented.

A powder container includes a powder container body having a cylindrical form to store powder. The powder container body includes a conveyer, a large diameter portion, a small diameter portion, and a boundary portion. The conveyer conveys the powder stored in the powder container body in a longitudinal direction of the powder container body. The large outer diameter portion has an outer diameter on a cross section orthogonal to the longitudinal direction. The small outer diameter portion has an outer diameter smaller than the outer diameter of the large outer diameter portion on the cross section. The boundary portion connects the large outer diameter portion and the small outer diameter portion.