| 摘要 |
In an electrostatic apparatus using a toner layer carried by a developing roller for developing a latent image, a doctor blade applied with a voltage of the same polarity as that of the toner is used for partly scraping the toner layer. The toner scraped off is sucked by a suction means. An additional doctor blade is preferably used together with the main doctor blade to make rough and fine control of the thickness of the toner layer.
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