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US 4,194,830 AGranted
Development apparatus
AssigneeRicoh Company, Ltd.
InventorsTeruyuki Ohnuma, Kaoru Shimizu, Seiichi Miyakawa, Hajime Oyama
Life of this patent
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AssigneeRicoh Company, Ltd.
InventorsTeruyuki Ohnuma, Kaoru Shimizu, Seiichi Miyakawa, Hajime Oyama
Estimating the term…
A development apparatus for developing a latent electrostatic image formed on a photoconductor with a one-component type developer has a charging device comprising at least two charging members for charging the developer held in a developer container. The first charging member serves both as a doctor blade and for regulating the amount of the developer on the development roller, and the second charging member charges the developer before it is charged by the first charging member. In the second charging member, there is formed a hole for allowing the developer to pass therethrough. The developer scraped by the first charging member is returned to the developer container through the hole and part of the scraped developer is carried back to the first charging member, so that a developer circulation path is formed in the charging device. While passing through the developer circulation path, the developer is charged further, whereby the developer is sufficiently charged before it is actually used for development.
In a development apparatus for developing a latent electrostatic image comprising a developer supplying means for supplying a one-component type developer to a latent electrostatic image bearing photoconductor, said developer supplying means being rotatable and bearing said one-component type developer thereon, a developer replenishing means for replenishing said one-component type developer to said developer supplying means, and a charging means for electrically charging said one-component type developer on said developer supplying means, the improvement comprising a first charging member for charging said one-component type developer, disposed at an outlet of said developer replenishing means and adjacent said developer supplying means, and at least one second charging member, which is disposed on an inner side of said first charging member and in which a hole is formed, said first charging member, second charging member, and developer supplying means forming a circulation path for return of excess developer to said developer replenishing means.
Dependencies are inferred from the claim text.