Toner cartridge for an image forming apparatus including a pump to discharge toner by putting air into the toner discharge chamber

A cartridge detachably attached to an apparatus main body of an image forming apparatus, the cartridge comprising:

• a casing including a toner storage chamber storing toner and a toner discharge chamber communicating with the toner storage chamber and having a toner outlet through which the toner is discharged to an outside of the cartridge;
• a conveyance member configured to rotate and convey the toner from the toner storage chamber to the toner discharge chamber;
• an action member attached to the conveyance member and configured to rotate with the conveyance member, the action member being configured to repeat action of shifting between an entering state in which the action member enters the toner outlet and a retraction state in which the action member retracts from the toner outlet, by rotation of the conveyance member;
• and
• a pump having an internal space, the pump being configured to expand and contract to be shifted between a first state and a second state in which the internal space is smaller in volume than the internal space in the first state, the pump being configured to put air of the internal space into the toner discharge chamber by being shifted from the first state to the second state, thereby discharging the toner from the toner discharge chamber to the outside of the cartridge through the toner outlet, the pump being configured to take air into the internal space by being shifted from the second state to the first state.