CARTRIDGE, DEVELOPING CARTRIDGE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide a cartridge capable of appropriately discharging a developer in a flexible developer bag to reduce the remaining amount of the developer.SOLUTION: A cartridge B can be removably attached to a body of an image forming apparatus A, and includes: a toner storage container 21; a toner discharge hole 103a; a flexible toner bag 100 that is arranged inside the toner storage container 21 to include a toner 2; and a pulling coil spring 40 that acts on the toner bag 100 to discharge the toner 2 from the toner discharge hole 103a. The pulling coil spring 40 is brought into contact with the toner bag 100 to be expanded from a free state, and elastic energy accumulated during the expansion acts on the toner bag 100 to discharge the toner 2 from the toner discharge hole 103a.