Electrophotographic printing device

Details Electrophotographic printing device Electrophotographic printing device

2006-10-17

2006-10-17

Gray, David M. (Department: 2852)

Electrophotography

Image formation

Transfer

C399S310000

Reexamination Certificate

active

07123867

ABSTRACT:
An electrophotographic printing device with a developer unit and a photoconductor. The photoconductor is either directly connected to a substrate to be printed in the region of a transfer zone, or is connected by an intermediate circuit of one or several transfer media. At least one charger is provided for the substrate and the substrate may be transported through the transfer zone by a transport device. According to this invention, an effective transfer of toner to the substrate surface can be achieved with such an arrangement, even with a poor electrically-conducting and thick-walled, sheet-like substrate, whereby a charger is arranged as the primary charger in the transport direction and a secondary charger is arranged in the region after the transfer zone and both primary and secondary chargers affect the surface of the substrate to be printed.

REFERENCES:
patent: 4674860 (1987-06-01), Tokunaga et al.
patent: 5539501 (1996-07-01), Yu et al.
patent: 6487386 (2002-11-01), Zimmer et al.
patent: 198 49 500 (2000-05-01), None
patent: 58172667 (1983-10-01), None

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