Coated roll for magnetic brush development and cleaning systems
AssigneeXerox Corporation
InventorsLawrence J. Fraser, Delmer G. Parker, Joseph L. Scaletta
Life of this patent
Estimating the term…
Abstract
To realize the advantages which sometimes attach to the use of electrically conductive carrier particles, the electrodes within development systems and cleaning systems for electrostatographic processors, such as xerographic copiers and duplicators, are coated or otherwise held in intimate contact with a sufficiently thick layer of material having a resistivity which is selected to prevent carrier caused short circuit events from producing irreversible damage and to localize the effects of such events. As a general rule, a 1-25 mil thick layer of a material having a resistivity in the range of 10.sup.7 - 10.sup.9 ohm.sup.. cm is adequate for that purpose.
Claims13
In an electrostatographic processor having an electrically insulating imaging surface with an electrically conductive backing;
- and a system including an electrode spaced from said imaging surface, means for creating a voltage drop between said electrode and said backing to generate an electrostatic field, and means for circulating electrically conductive carrier particles along a path passing through the space between said imaging surface and said electrode;
- the improvement comprising a substantially uniformly thick layer of resistive material in intimate contact with said electrode, the thickness of said layer and resistivity of said material being selected to limit the energy dissipated during any carrier caused short circuit event to a predetermined non-destructive level and to confine the effects of such an event on said field to a localized portion of said field.
Dependencies are inferred from the claim text.