| 摘要 |
PURPOSE:To enable a good visible image to be obtained by electrostatically charging, to a prescribed polarity, the toner for a developer composed of an insulating nonmagnetic toner and a magnetic carrier, allowing a sleeve to separate the carrier from the toner and to hold only the toner, and forming a toner layer. CONSTITUTION:The developer 5 composed of the nonmagnetic toner 51 charged to prescribed polarity in advance and the magnetic carrier 52 holding the toner 51 by the electrostatic force are carried to the vicinity of the sleeve 20 with a stirring roller 10. The sleeve 20 is made of an electrically conductive nonmagnetic material, rotates around magnets 21, and forms a magnetic brush of the developer 5 in the direction of the magnetic force lines of the magnet 21 on the sleeve 20. As the carrier 52 moves over the upper end magnet 210 and approaches a photosensitive body 7, the carrier 52 drops on account of its own weight, and the charged toner 51 is left on the sleeve 20 by the action of separating means 3, and only the toner 51 is carried along the sleeve 20 toward the photosensitive body 7.
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