A toner cartridge includes a first casing, a second casing, an auger screw, and a shutter. The first casing has a first internal space. The second casing has: a second internal space smaller than the first internal space; a first opening allowing toner in the second internal space to be discharged; and a second opening allowing air in the second internal space to be sent to an outside. The auger screw is rotatable about a first rotation axis and configured to convey toner in the first internal space to the second internal space. The shutter is rotatable relative to the second casing about a second rotation axis between a first position in which the shutter closes the first opening and a second position in which the shutter opens the first opening. In a state where the shutter is at the second position, the shutter does not close the second opening.

A toner supply device includes: a device body; and a toner bottle, wherein a toner supply port is formed in each of the device body and the toner bottle, either one of the device body and the toner bottle includes: a shutter that can be selectively moved between a shielding position and an open position; and a first engagement part, the other one of the device body and the toner bottle includes a second engagement part, the shutter is moved from the shielding position to the open position and the shutter opens the toner supply port, and then the first engagement part is engaged with the second engagement part, and the shutter is moved from the open position to the shielding position and the shutter closes the toner supply port, and then engagement between the first engagement part and the second engagement part is disengaged.

A developing device includes a developing roller, a casing, a dividing wall, and a shutter. A first chamber and a second chamber are formed in the casing. An opening is formed in the casing. The opening permits the first chamber to communicate with the outside and faces the developing roller. The dividing wall is disposed in the casing. The dividing wall divides the first chamber and the second chamber. At least one communicating window is formed on the dividing wall. The communicating window connects the first chamber and the second chamber. The shutter is selectively switched between a first state in which the communicating window is opened and a second state in which the communicating window is blocked.

A developer conveying mechanism includes a pipe-shaped conveying path that conveys developer and includes a discharge port formed in part of a side surface thereof, a shutter that is slidably attached to the pipe-shaped conveying path and that is selectively arranged at a closing position overlapping with the discharge port and an opening position retreated from the discharge port, a seal member that is fixed to a seal affixing surface of the shutter, and a biasing member that biases the shutter toward the closing position. The shutter includes the seal affixing surface, which is a flat surface, and a pair of engagement portions that are opposite to each other across the seal affixing surface in a circumferential direction of the pipe-shaped conveying path. The pipe-shaped conveying path includes a pair of guide ribs with which the pair of engagement portions slidably engage.

An image forming apparatus including a first unit having an image bearing member, a second unit having a development member, an apparatus main body which includes an opening portion, an opening-closing member to open or close the opening portion, a first portion contacting with a part of the first unit to position the first unit to the apparatus main body, and a second portion arranged on an opposite side of the first portion with respect to the image bearing member, and a sandwiched unit movable between a first position at which the sandwiched unit is sandwiched between the first unit and the second portion and a second position at which the sandwiched unit is not sandwiched, wherein when the sandwiched unit is located at the first position, a part of the first unit is urged against the first portion by the sandwiched unit.

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.

The present disclosure provides a developer container including a developer supplying box and a developer containing box. A first gear is rotatably connected to the developer supplying box, and a rotating shaft is inserted into the first gear; first stirring blades are fixed to two sides of the rotating shaft, and a second stirring blade is fixed at the rotating shaft; a first sliding cover is sleeved on the developer supplying box, and a sliding cover powder outlet is disposed on the first sliding cover; a supply box powder outlet is disposed on the developer supplying box; the first gear is engaged with a second gear, the second gear is engaged with a third gear, the third gear is engaged with a fourth gear, and the fourth gear is engaged with a fifth gear; and a screw feeding rod is inserting into the fifth gear.

A toner cartridge includes a first casing, a second casing, an auger screw, and a shutter. The first casing has a first internal space. The second casing has: a second internal space smaller than the first internal space; a first opening allowing toner in the second internal space to be discharged; and a second opening allowing air in the second internal space to be sent to an outside. The auger screw is rotatable about a first rotation axis and configured to convey toner in the first internal space to the second internal space. The shutter is rotatable relative to the second casing about a second rotation axis between a first position in which the shutter closes the first opening and a second position in which the shutter opens the first opening. In a state where the shutter is at the second position, the shutter does not close the second opening.

The present disclosure features an image forming apparatus having a first developing unit having a first developing roller; and a first toner supply unit configured to supply toner to the first developing unit, the first toner supply unit having: a first container configured to accommodate the toner therein, the first container having a first inlet opening through which the toner is received in the first container and a first outlet opening through which the toner in the first container is discharged; a first lid configured to close the first inlet opening; and a first shutter configured to open the first outlet opening when the first lid closes the first inlet opening, and to close the first outlet opening when the first lid opens the first inlet opening.

An example development cartridge includes a shutter switchable between a closing position and an opening position to open and close a toner inlet through which a toner may be received, and a locking member switchable between a locking position to lock the shutter at the closing position and an unlocking position to allow the shutter to be opened.