Eastman-kodak Company

George P Kasper

Arthur S Kroll

Michael Wilfred Mosehauer

Garold F Fritz

Douglas E Bugner

John W May

William J Staudenmayer

Borden H Mills

Robert J O'Brien

A process and system for inhibiting toner offset in a electrostatographic apparatus of the kind wherein toner images are contact fused to a copy sheet. Drops of offset inhibiting liquid are discretely directed to predetermined locations on the contacting surface of the apparatus fuser member. For example, a drop on demand, piezoelectric drop generator can controllably jet drops of silicone oil to form desired offset inhibiting patterns in accord with apparatus control signals, indicative of particular copy sheet and image requirements.

Electrostatographic apparatus having fusing process and system for

Electrographic development is obtained by predeterminedly rotating an alternating pole core of a magnetic brush applicator, within a surrounding applicator shell, to supply developer, of the kind including small particle, hard-magnetic carrier and electrically insulative toner, to an electrostatic imaging member which moves past a development station with predetermined linear velocity. The shell can be stationary or rotate at a velocity significantly less than the image member velocity. The core is predeterminedly rotated so that (i) its fields effect a large portion of transport through the development zone and (ii) the developer moves co-currently with the imaging member and at a linear velocity generally equal to the imaging member velocity.

Electrographic development method, apparatus and system

Improved electrographic development is obtained in the presence of a development electrode field by predeterminedly rotating both the core and shell of a magnetic brush applicator to supply developer, of the kind comprising small particle, hard-magnetic carrier and electrically insulative toner, to an electrostatic imaging member which moves past a development station with predetermined linear velocity. In one preferred embodiment the core and shell are predeterminedly rotated so that the shell moves through the development zone at a rate preventing toner that is plated-out on the shell from affecting image development and so that the developer moves co-currently with the imaging member at a generally equal linear velocity.

Electrographic magnetic brush development method, apparatus and system

Electrographic development apparatus of the kind having a developer housing and magnetic means for feeding developer along a path from a supply, to a developing position and back toward the supply includes cross-mix magnet means located proximate a portion of the developer path and means for oscillating the magnet means transversely across the path. In one preferred embodiment the cross-mix magnet and oscillating means are located external of the developer housing.

Electrographic development apparatus and method having oscillating

In a novel electrographic copying method and apparatus, a latent electrostatic image is formed on an insulating layer of an electrophotographic element and, before, during or after the formation of the latent electrostatic image, there is created a plurality of charge islands, such as by an exposure through a screen. These charge islands are distinct and in addition to any charge islands which result from the image-forming step. After establishment of the charge islands and the latent electrostatic image, the resulting charge pattern is developed with a developer which either is at least partially conductive, i.e., has a maximum resistance of about 10.sup.9 ohms, or is rendered so by the phenomenon of electrical breakdown.

Method and means for improving maximum density and tonal range of

Development of electrostatic charge patterns (e.g., electrostatic latent images) carried on a support is accomplished in an electrographic process in which during development, an electrical field which is greater than the electrical breakdown value of the developer (i.e., greater than the maximum electrical field that the developer can support without undergoing electrical breakdown) is established across the developer in the development area. The process enables development of high quality, large solid-area images at high processing rates.

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Rochester, NY, United States of America

George P Kasper