Method and apparatus for developing an electrical image

Details Method and apparatus for developing an electrical image Method and apparatus for developing an electrical image

1974-05-31

1979-08-14

Moses, R. L.

Photocopying

Including fiber optics

118653, 427 25, G03G 1500

Patent

active

041643720

ABSTRACT:
In xerography a positive charge image on the surface of a photoconductor is developed with a blade shaped conductor, and a non-conductive and flexible donor sheet having on one side a negatively charged toner layer. The donor sheet is mounted such that the layer is spaced from but near the surface of the photoconductor, and the conductor is mounted such that its edge slidably abuts the other side of the donor sheet in the region where the sheet is nearest the photoconductor. As a result, the part of the image nearest the edge establishes a non-uniform electrical field between the image and the edge. The non-uniform field is strongest in the region nearest the edge and causes the transfer of toner from the layer to the photoconductor. In one embodiment the donor sheet is in the form of a belt which is driven so that it slides over the edge. The photoconductor is placed on the surface of a rotatable drum and as the drum is rotated the image is developed. Means are provided for replenishing the toner used during development. In another embodiment the donor sheet and photoconductor are supported in parallel and the conductor is moved across said other side of the donor sheet to develop the image.

REFERENCES:
patent: 2820716 (1958-01-01), Harmon et al.
patent: 3232190 (1966-02-01), Willmoth

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