Preconditioning media sheets to reduce transfer voltage

Details Preconditioning media sheets to reduce transfer voltage Preconditioning media sheets to reduce transfer voltage

2007-03-28

2009-12-29

Gray, David M (Department: 2852)

Electrophotography

Document handling

Copy

C399S066000, C399S297000

Reexamination Certificate

active

07639979

ABSTRACT:
Image transfer quality in an electrophotographic image forming device is improved by preconditioning a media sheet prior to transferring a toner image thereto at an image transfer station. The media sheet is preconditioned by applying a static charge to it. In a color DTM type device, the charge reduces the transfer voltages required at downstream image transfer stations to account for charge accumulated on the media sheet as a result of the image transfer process at upstream image transfer stations. The charge may be applied to the media sheet at a media sheet preconditioning element positioned upstream of an image transfer station. Alternatively, an initial charge may be applied to the media sheet at an image transfer station, without transferring a toner image to the sheet, and returning the sheet via a duplex path to positioned upstream of an image transfer station prior to an image transfer operation.

REFERENCES:
patent: 4162843 (1979-07-01), Inoue et al.
patent: 5907758 (1999-05-01), Tanaka et al.
patent: 6253041 (2001-06-01), Tomizawa et al.
patent: 2005/0074250 (2005-04-01), Nishiwaki et al.

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