Pre-pretransfer treatment to increase transfer latitude in tri-level xerography
AssigneeXerox Corporation
InventorsKenneth W. Pietrowski, Larry G. Hogestyn, Delmer G. Parker
Life of this patent
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Abstract
Pre pretransfer treatment for multiple toner toner images increases the operating latitude for pretransfer/transfer. In one embodiment of the invention, a pre pretransfer corona device is used to drive the tribos of two multiple toner images toward each other prior to pretransfer. A single constant current corona discharge device is used in this embodiment. Subsequent pretransfer treatment serves to reduce the delta tribo between the two images thereby providing an operating latitude of 3 micro coul/g.
Claims26
A method of creating multiple toner images and enhancing the transfer thereof from a charge retentive surface to a final substrate, said method including the steps of:
- forming a multiple toner image on a charge retentive surface, said multiple toner image comprising a plurality of images having different charge levels;
- reducing the charge level of each of said images prior to a pretransfer treatment;
- subjecting said images to a pretransfer treatment;
- subjecting said images to a transfer treatment and
- transferring said toner images to a final substrate.
Apparatus for creating multiple toner images and enhancing the transfer thereof from a charge retentive surface to a final substrate, said apparatus comprising:
- means for forming a multiple toner toner image on a charge retentive surface, said multiple toner image comprising a plurality of images having different charge levels;
- means for reducing the charge level of each of said images prior to a pretransfer treatment;
- means for subjecting said images to a pretransfer treatment;
- means for subjecting said images to a transfer treatment and
- means for effecting transfer said toner images to a final substrate.
Dependencies are inferred from the claim text.