Electrostatically assisted transfer roller and method for direct

Details Electrostatically assisted transfer roller and method for direct Electrostatically assisted transfer roller and method for direct

1991-05-17

1992-05-19

Moses, R. L.

Photocopying

Contact printing

Light boxes

355279, 355326, 355 77, 430126, 430 42, G03G 1516

Patent

active

051152770

ABSTRACT:
An electrostatically assisted transfer roller is rotatably mounted to be driven directly against one surface of an adjacent print media and against an adjacent surface of a photoconductive drum at the other opposite surface of the print media. This transfer roller is operative to transfer transparent developed liquid color toners from the surface of the photoconductive drum and onto the print medium using a combination of mechanical forces, electrostatic forces, and thermal energy. The transfer roller includes a metal inner sleeve member within which a heat source is suitably mounted, and an outer non-metallic sleeve member is positioned around the inner sleeve member and is preferably a conductive silicone or conductive polyurethane material. A thin outer overcoat layer is disposed on the outer surface of the outer sleeve member and is adapted to be driven directly against an adjacent surface of the print medium. A source of DC bias voltage is connected to the metal inner sleeve member to thereby develop electrostatic forces at the surface of the print medium for assisting in the efficient transfer of color images thereon having good print quality.

REFERENCES:
patent: 4602879 (1986-07-01), Takagi
patent: 5021829 (1991-06-01), Johnson et al.
patent: 5106056 (1991-05-01), Johnson et al.

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