Abstract: A toner cartridge is constructed to include a container for accommodating toner, the container having a filling hole portion disposed at one end for filling of toner into the container and a barrel with a discharging hole at an opposite end for output of toner to a toner-receiving container in the image forming system in which the toner cartridge is installed, a strippable seal attached to the barrel to seal the discharging hole, and a stopper coupled to the barrel and moved to close/open the discharging hole after removal of the seal from the barrel.

Abstract: A toner cartridge is constructed to include a container for accommodating toner, the container having a filling hole portion disposed at one end for filling of toner into the container and a barrel with a discharging hole at an opposite end for output of toner to a toner-receiving container in the image forming system in which the toner cartridge is installed, a strippable seal attached to the barrel to seal the discharging hole, and a stopper coupled to the barrel and moved to close/open the discharging hole after removal of the seal from the barrel.

Abstract: A developer container having a gear transmission mechanism coupled between a mixer, which is mounted inside the container body of the developer container to mix developer, and a propelling screw, which is mounted in a developer supply trough at a bottom side of the developer container and adapted to propel developer out of the developer container and the developer supply trough, for enabling the mixer to be rotated to mix developer upon rotary motion of the propelling screw to propel developer out of the developer supply trough.

Abstract: A developer container having a gear transmission mechanism coupled between a mixer, which is mounted inside the container body of the developer container to mix developer, and a propelling screw, which is mounted in a developer supply trough at a bottom side of the developer container and adapted to propel developer out of the developer container and the developer supply trough, for enabling the mixer to be rotated to mix developer upon rotary motion of the propelling screw to propel developer out of the developer supply trough.

Abstract: A developer container which includes a connector element connects a container body to an image forming apparatus, and a rotating sealing member rotated in an inside chamber in the connector element to close/open the developer passage through the connector element, wherein the rotating sealing member has a flat shutter board, which closes the developer passage through the connector element when turned with the rotating sealing member to a horizontal position, or opens the developer passage through the connector element when turned with the rotating sealing member from the horizontal position to a vertical position.