Abstract: A developer container having a spiral groove around the periphery, a developer supply hole at one end, two protruding positioning strips raised from the periphery at two opposite sides of the developer supply holes an annular flange at an opposite end for enabling the developer container to be put on a flat surface in vertical, two opposed notches formed on the annular flange, and two toothed blocks respectively suspended in the notches for engagement with respective toothed blocks at a driving shaft in an electrophotographic image forming apparatus for synchronous rotation with the driving shaft.

Abstract: A developer cylinder and drive gear arrangement, includes a drive gear having a coupling hole at one end of its gear shaft, and a developer cylinder having a coupling block at its one end coupled to the coupling hole at the gear shaft of the drive gear, wherein the coupling block of the developer cylinder has six peripheral sides and six peripheral angles.

Abstract: A developer container includes a container body having a front opening, and a developer dispensing outlet near the front opening, a propelling member suspended in the container body and rotated to propel a developer out of the developer dispensing hole, and a rotary cover covered on the front opening of the container body and secured in place upon installation of the developer container in a copier for enabling the container body to be rotated relative to the rotary cover to close/open the developer dispensing outlet, wherein the container body has a sliding groove for guiding rotary motion of the container body relative to the rotary cover, and a rib for engagement with a rib at the rotary cover to stop the container body from rotary motion relative to the rotary cover; the rotary cover has a cover flange for closing the developer dispensing outlet, a guide plate matched with the sliding groove at the front end of the container body, and a rib raised from the guide plate for engagement with the rib in the sl

Abstract: A developer dispensing container includes a container body covered with a container cap, a dispensing nozzle suspended in the container body with a nozzle tube extended out of the center hole on the container cap, a nozzle cap mounted around the nozzle tube and moved along longitudinal sliding grooves at the nozzle tube to close/open the nozzle tube, a rotary driving member coupled to the nozzle cap and driven to move the nozzle cap along the longitudinal sliding grooves of the nozzle tube, and a stirrer revolvably supported on an axle bearing inside the container body and rotated with the dispensing nozzle when the nozzle cap is opened from the nozzle tube and the rotary driving member is continuously rotated.