toner supply outlet and a toner supply inlet and a pushing means for moving the toner supply auger in the loading and unloading direction of the toner supply cartridge thereby changing a site of the toner supply auger facing the toner supply inlet to another site near the back end of the toner supply auger application_number US 5861002 A description now embodiments of the present invention will be described in detail with reference to the accompanying drawings fig1 is a front view of a developing apparatus according to an embodiment of the present invention fig2 is a sectional view of the developing apparatus the developing apparatus comprises a developing unit 1 and a toner cartridge 2 the toner cartridge 2 serves as a toner supplier and slidably attached to the upper surface of the developing unit 1 the developing unit 1 has a developer case for storing a developing agent in the upper portion of the developer case 3 a magnet roller 4 serving as a developing roller and a toner supply auger 6 are arranged in the lower portion of the developer case 3 two transfer mixers 8 and 9 are rotatably arranged the magnet roller 4 is arranged so as to face a photoconductive drum 7 a partition board 10 is.