| 摘要 |
The present invention relates to a dry developer apparatus for forming a magnetic brush in electrostatic image development, wherein the developer composed of a magnetic carrier and toner magnetically adheres to a rotary roller having a specific magnetic pole. The magnetic brush is formed between the rotary roller and an opposed plate of different magnetic polarity which is mounted in parallel spaced relationship to the rotary roller by a control permanent magnet mounted in parallel spaced relationship to the roller. Rotation of the permanent magnet so that a magnetic polarity opposite to that of the roller causes the developer to be attracted to the roller surface.
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