| 摘要 |
PURPOSE:To prevent a picture tone from being varied even if a development processing of an image of high density is performed continuously, by providing a blade on a developing roller, and providing a supply roller consisting of an elastic material, in the vicinity of the developing roller. CONSTITUTION:A blade 28 is a developer layer forming means, and usually attached so as to be pressed against the peripheral surface of a developing sleeve 21 by prescribed press-contacting force. Also, a supply roller 27 consists of an elastic material, positioned between the sleeve 21 and a stirring rotor 23, and also, attached to a position which comes into contact to the peripheral surface of the sleeve 21 or which is extremely adjacent to said surface. This roller 27 peels off a developer which has ended a development processing, forcibly from the peripheral surface of the sleeve, and on the other hand, supplies positively a new developer containing toner powder of a prescribed quantity. Also, the blade 28 flattens a layer of a new developer supplied from the stirring rotors 23, 24, and simultaneously, flattens an image of the developer, and simultaneously, executes an action for changing it to a thin layer of the most suitable thickness for the development processing. As a result, a stable developing capacity is obtained.
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