Injection roller developer for electrophotographic copier and biasing system therefor
AssigneeSavin Corporation
InventorBenzion Landa
Life of this patent
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Abstract
A developing system for an electrophotographic copier in which a roller having a conductive outer surface is disposed adjacent to the imaging surface to form a gap. The roller is driven at a peripheral linear velocity substantially greater than the velocity of movement of the imaging surface and is supplied with liquid developer at a location spaced from the gap to cause the roller to inject the developer into the gap. The roller is coupled to a source of potential through a gas discharge tube to maintain the potential of the electrode within predetermined limits.
Claims12
In an electrophotographic copier, a photoconductor adapted to bear an electrostatic image on its surface, a roller, means for resiliently urging said roller toward said surface, means for supplying liquid developer to said roller, means for moving said photoconductor past said roller, and means for rotating said roller at such a velocity that the hydrodynamic pressure of said liquid developer on said roller forces said roller away from said photoconductor against the action of said urging means to form a gap for the injection of said developer.
In an electrophotographic copier, a photoconductor adapted to bear an electrostatic image on its surface, a conductive roller, means for resiliently urging said roller toward said surface, means for supplying liquid developer to said roller, means for moving said photoconductor past said roller, and means for rotating said roller at such a velocity that the hydrodynamic pressure of said liquid developer on said roller forces said roller away from said photoconductor against the action of said urging means to form a gap for the injection of said developer.
In an electrophotographic copier, a photoconductor adapted to carry an electrostatic image on its surface, a conductive roller, means for disposing said roller adjacent said surface to form a gap therebetween, means for supplying liquid developer to said roller, means for moving said photoconductor past said roller, means for driving said roller at a peripheral velocity substantially greater than the velocity of said photoconductor to inject said developer into said gap, means for providing a biasing potential, and means for coupling said roller to said biasing potential means, said coupling means including a gas discharge tube connected between said roller and said biasing potential means, whereby the difference between the potential of said roller and said biasing potential is limited to the breakdown potential of said tube.
Dependencies are inferred from the claim text.