Title: Stepped transfer roller

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Abstract: A biased roller electrostatographic image transfer system in which the diameter of a resilient bias transfer roll is slightly larger at its outer end areas in comparison to its central copy sheet engaging area, so that the majority of the roll loading pressure is absorbed by these larger diameter end steps, which roll directly against the imaging surface outside of the copy area, and so that a relatively lower roll pressure is provided against the copy sheet in the operating nip. This reduction in the mechanical pressure in the transfer nip can provide lower "hollow character" transfer defects, yet allows a sufficiently high roller loading force to prevent roll bounce and vibration.


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