Apparatus for transferring toner images to a receiving sheet

Details Apparatus for transferring toner images to a receiving sheet Apparatus for transferring toner images to a receiving sheet

1989-07-03

1990-08-14

Braun, Fred L.

Photocopying

Contact printing

Light boxes

355 73, 355271, 355312, 355326, G03G 1516

Patent

active

049491296

ABSTRACT:
A transfer member, for example, a transfer drum utilizes a vacuum applied through vacuum holes to the drum surface for holding a receiving sheet. A toner image is transferred to the sheet under the urging of an electric field. To prevent non-transfer over the vacuum holes, the holes are filled or covered with a conductive material that is sufficiently conductive to maintain the electric field over the holes and sufficiently porous to maintain the vacuum at the surface. For example, a polyurethane foam material can be used for the material in or over the vacuum holes.

REFERENCES:
patent: 3776630 (1973-12-01), Ohno et al.
patent: 3869203 (1975-03-01), Lehmann
patent: 3993021 (1976-12-01), Kline
patent: 4272181 (1981-06-01), Treseder
patent: 4739361 (1988-04-01), Roy et al.
patent: 4862224 (1989-08-01), Ku

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