| 摘要 |
<p>A developing device, using a one-component developer composed of colored fine synthetic resin toner particles, comprises a vessel (12) for holding the developer (D) and a developing roller (26) rotatably provided within the vessel (12), a portion thereof being exposed therefrom and resiliently pressed against a surface of a photosensitive drum (24). The toner particles are held by the surface of the developing roller (26) to form a developer layer therearound, and are carried to the surface of the image formation drum (24) for development of an electrostatic latent image formed thereon. The developing device further comprises a blade member (28) provided within the vessel (12) and resiliently engaged with the developing roller (26) for regulating a thickness of the developer layer formed therearound. Means (42,44,46,48,50,52,54,56) are provided whereby the pressures exerted on the developing roller (26) by the photosensitive drum (24) and the blade member (28), respectively, can be at least partially released.</p> |
