Back to results
US 4,015,561 AGranted
Anti-gravitational cascade development for electrostatic processors
AssigneeXerox Corporation
InventorsWillard L. Howard, Ryland F. Rogers
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeXerox Corporation
InventorsWillard L. Howard, Ryland F. Rogers
Estimating the term…
Latent electrostatic images carried by a photoconductively coated substrate of an electrostatic processor are developed in a magnetic field free development zone by a multicomponent developer. The developer circulates in a path which runs from a lower level of a sump, upwardly through the development zone, and then back to the sump. To that end, there are means below the development zone for propelling the developer upwardly into and through that zone, together with means above the development zone for capturing the excess developer (i.e., the developer not consumed in the development process) emerging from that zone. In one embodiment, there are separate magnetic transport rolls for propelling the developer into the development zone and for recapturing the excess developer. To accomodate that embodiment, a developer containing ferromagnetic carrier particles and toner particles is used. That embodiment may be enhanced by employing a development electrode to improve the solid area coverage, and that electrode may be appropriately biased to hold background development at an acceptable low level.
A development system for developing latent electrostatic images carried by an image bearing member with developer including toner particles and ferromagnetic carrier particles as said member moves through a substantially magnetic field free development zone having an upper side and a lower side;
An electrostatic processor having a photoconductively coated substrate for carrying latent electrostatic images, a development system for providing an antigravitational flow of a multi-component developer through a development zone to develop said images as said photoconductively coated substrate moves through said development zone;
Dependencies are inferred from the claim text.