| 摘要 |
A scraper blade or roller engages the surface of a photoconductive drum and causes residual toner substance to pile up. The pile of residual toner is then released and carried by the drum to a position where it is removed therefrom by gravity, another scraper blade or a magnetic brush which bifunctions as a developing means. A groove may be formed in the drum surface into which the piled-up residual toner substance drops to be carried away for removal. A bias electrode or electromagnet which attracts the toner substance may replace the groove.
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