| 摘要 |
PURPOSE:To prevent toner from being excessively fed by forming a diaphragm for feeding the toner into an air room through a toner feeding slit and guiding a developer so as to make a part of the developer collide with the toner fed from the slit. CONSTITUTION:A magnetic roller 2 is coaxially stored in a developing sleeve 1 and the sleeve 1 is arranged on the aperture part of a casing 10 as to be adjacent to the surface of a photosensitive drum 20. The magnetic toner is loaded into a toner storing part 12, carried to the slit 6 side by the rotation of a toner feeding blade 13, raised along the partition plate 5 on the basis of pulsating action due to the rotation of the roller 2 in the arrow (a) direction, and then fed into the pre-room 7a of an empty room 7 through the slit 6. The fed toner is carried on the periphery of the sleeve 1 in the arrow (b) direction and a part of the developer is interrupted at its carrying by an intermediate partition plate 8 and reversely carried along the diaphragm 4. The reversed developer collides with the toner fed from the slit 6 to suppress the toner feeding, preventing the toner from being excessively fed.
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