Apparatus and method for reducing ghosting defects in a printing machine
AssigneeXerox Corporation
InventorMark J. Hirsch
Life of this patent
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Abstract
An apparatus for developing a latent image recorded on a movable imaging surface, including: a reservoir for storing a supply of developer material; a first donor member and a second donor member, the first and second donor members both being arranged to receive toner particles from the reservoir and to deliver toner particles to the image surface at locations spaced apart from each other in the direction of movement of the imaging surface thereby to develop the latent image thereon; and system for moving the outer surface of first donor member at a first velocity; and system for moving the outer surface of second donor member at a second velocity; wherein the first velocity could be slightly different than the second velocity to reduce a ghosting print defect.
Claims10
An apparatus for developing a latent image recorded on a movable imaging surface, including:
- a reservoir for storing a supply of developer material;
- a first donor member and a second donor member, said first and second donor members both being arranged to receive toner particles from said reservoir and to deliver toner particles to the image surface at locations spaced apart from each other in the direction of movement of the imaging surface thereby to develop the latent image thereon;
- and
- means for moving the outer surface of first donor member at a first velocity;
- means for moving the outer surface of second donor member at a second velocity;
- wherein said first velocity is different than said second velocity to reduce a ghosting print defect, said first donor member develops a first ghost image on said imaging surface and said second donor member develops a second ghost image on said imaging surface that overlays said first ghost image by a predefined separation gap.
A method for developing a latent image recorded on a movable imaging surface with a developer apparatus, including:
- a reservoir for storing a supply of developer material;
- a first donor member and a second donor member, said first and second donor members both being arranged to receive toner particles from said reservoir and to deliver toner particles to the image surface at locations spaced apart from each other in the direction of movement of the imaging surface thereby to develop the latent image thereon, said method comprising:
- moving the outer surface of first donor member at a first velocity in a first direction;
- moving the outer surface of second donor member at a second velocity;
- in said first direction;
- wherein said first velocity is slightly different than said second velocity to reduce a ghosting print defect:
- developing a first ghost image on said imaging surface with said first donor member and developing a second ghost image on said imaging surface that overlays said first ghost image by a predefined separation gap with said second donor member.
An electrographic printing machine having an apparatus for developing a latent image recorded on a movable imaging surface, including:
- a reservoir for storing a supply of developer material;
- a first donor member and a second donor member, said first and second donor members both being arranged to receive toner particles from said reservoir and to deliver toner particles to the image surface at locations spaced apart from each other in the direction of movement of the imaging surface thereby to develop the latent image thereon;
- means for moving the outer surface of first donor member at a first velocity;
- said first donor member develops a first ghost image on said imaging surface and said second donor member develops a second ghost image on said imaging surface that overlays said first ghost image by a predefined separation gap;
- and
- means for moving the outer surface of second donor member at a second velocity;
- wherein said first velocity is different than said second velocity to reduce a ghosting print defect.
Dependencies are inferred from the claim text.