| abstract |
A XEROGRAPHIC APPARATUS HAVING A PHOTOSENTIVE MEMBER IN THE FORM OF A XEROGRAPHIC DRUM, SAID DRUM HAVING A CONDUCTIVE SUBSTRATE, A THIN LAYER OF CHROMIUM CONTAINED ON SAID SUBSTRATE, AND A LAYER OF PHOTOCONDUCTIVE INSULATING AMORPHOUS SELENIUM COVERING THE CENTRAL PORTION OF SAID CHROMIUM COATED DRUM LEAVING THE TWO PERIPHERAL EDGES OF SAID DRUM COATED ONLY WITH A CHROMIUM LAYER, MEANS FOR FORMING A LETENT ELECTROSTATIC IMAGE ON THE PHOTOCONDUCTIVE INSULATING LAYER, DEVELOPER MEANS INCLUDING A DEVELOPER HOUSING FOR DEVELOPING SAID LATENT ELECTROSTATIC IMAGE, MEANS ADAPTED TO FORM A CONTACT SEAL BETWEEN A PORTION OF SAID DEVELOPER HOUSING AND A PORTION OF THE CHROMIUM COATED EDGES OF THE XEROGRAPHIC DRUM, AND MEANS TO MOVE SAID XEROGRAPHIC DRUM WITH RESPECT TO SAID IMAGING AND DEVELOPER MEANS. |