| 摘要 |
PURPOSE:To prevent a developer from being scattered by providing a developing sleeve, a magnet roller which circulates the developer, and a lower scooping roller arranged adjacently to the magnet roller. CONSTITUTION:Respective developing units 2, 3, and 4 each have a casing 5 for containing a developer. Then, the magnet roller 6 is arranged closely to the bottom of each casing 5, and the lower scooping roller 7 is arranged slightly above the magnet roller 6; and an upper scooping roller 8 is arranged slightly above the scooping roller 7, and the developing sleeve 9 is arranged between the scooping roller 8 and a photosensitive drum 1. Consequently, a long stirring time is obtained, and the ground staining and stripe staining of the photosensitive body and the scattering of the developer dur to a deficiency in the electrostatic charging amount of the developer are prevented. |
