Abstract: A container body installed in an image forming apparatus to supply developer, having a spiral developer guide spirally extended around an inside wall thereof for guiding developer out of a front opening thereof, the spiral developer guide having a spiral guide way formed of flat surface portions and sloping surface portions alternatively connected in series, and two spiral flanges spirally formed integral with the inside wall of the container body along the series of flat surface portions and sloping surface portions at two opposite lateral sides.

Abstract: A developer replenishing container having a developer guide cone connected between a cylindrical body portion and a bottle neck for guiding developer out of the cylindrical body portion via the bottle neck, wherein the developer guide cone defines a spiral guide wall portion and a spiral developer flow passageway for guiding developer from the cylindrical body portion toward the bottle neck, the developer guide cone having a diameter made gradually reduced toward the bottle neck, and an angle of slope within about 15°˜45°, the spiral guide wall portion having a depth within about 3˜18 mm, the spiral developer flow passageway having a rear end smoothly extended to the bottle neck in a flush manner for guiding developer to the bottle neck.

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 a plurality of teeth spirally disposed around the periphery thereof.

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.