| 摘要 |
Apparatus and method for applying developer to an image carrier in a copying machine so that a regulated amount of developer is applied to the image carrier during image development but is inhibited from reaching the image carrier during nondevelopment. The developer is supplied to a developer carrier roller. The amount of developer on the developer carrier roller is regulated by a regulating roller which is mounted in a position opposing the developer carrier roller. The developer carrier roller then carries the developer to a developing position opposite the image carrier. An electric field, which is reversible, is applied between the developer carrier roller and the regulating roller. During image development, the electric field is applied so that the developer is attracted to the developer carrier roller. During nondevelopment, the electric field is reversed and the developer is attracted to the regulating roller, thus inhibiting developer from reaching the image carrier.
|
