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US 5,689,789 AGranted
Uniform nip velocity roll fuser
AssigneeXerox Corporation
InventorRabin Moser
Life of this patent
Estimating the term…
Abstract
A heat and pressure roll fuser is disclosed for fixing powder images to various substrates. Each of the rolls has a deformable outer layer. One of the rollers is crowned such that its center has a larger diameter than its ends. The other roller has a uniform diameter along its entire length. The difference in the center diameter and the end diameters is such that the fuser produces a nonuniform nip and a uniform nip velocity.
Claims3
Fuser apparatus for fixing toner images to various substrates, said apparatus comprising:
- a heated fuser roll having an outer deformable elastomeric layer and a nonuniform diameter such that it has a larger diameter at its center than at its ends;
- a pressure roll having an outer deformable elastomeric layer having a thickness that is equal to or less than the thickness of the deformable elastomeric layer of said fuser roll and having a uniform diameter;
- said ends of said fuser roll having a dimension that produces a substantially uniform nip profile and a uniform nip velocity when moved in pressure engagement with said pressure roll.
Dependencies are inferred from the claim text.