| 摘要 |
PURPOSE:To coat the toner thinly and uniformly on a toner carrying roller and control the coating thickness by forming an electric field between the toner supply roller and the toner carrying roller having a gap each other thereby performing handing and receiving of the toner. CONSTITUTION:From a vessel 10, an insulating toner 2 is first coated on a supply roller 4 by a blade 5. The minimum gap between the supply roller 4 and a carrying roller 3 is larger than the thickness of the toner layer to be coated on the roller 4 by the blade 5 and the toner is moved to the carrying roller 3 by the electric field formed between the rollers 3 and 4 by an electric power source 6. This electric field is preferably AC electric field. The toner layer thickness on the carrying roller 3 is controlled as desired by changing the output of the electric power source 6 or the relative speeds of the roller 3 and the roller 4. The toner remained on the carrying roller 3 without being consumed owing to the contact with the developing part of a photoreceptor 1 is once scraped down by a scraper 9 or the like and is recovered into the vessel 10. |
