Incremental printing of symbolic information – Electric marking apparatus or processes – Electrostatic
Patent
1996-12-11
1998-04-07
Moses, R. L.
Incremental printing of symbolic information
Electric marking apparatus or processes
Electrostatic
347115, 358300, 399298, 101DIG37, G01D 1506
Patent
active
057370044
ABSTRACT:
A method of developing an electrostatic latent image produced on a surface of a movable intermediate carrier by electrically-charged dielectric color particles which are transported through a gap between the surface of the intermediate carrier and a surface of a developing device includes loosely filling most of the gap with color particles, and successively producing, along the transport path of the color particles through the gap, the following voltage differences between the surface of the developing device and non-image regions on the surface of the intermediate carrier: a first voltage difference substantially equal to zero, so that the color particles are not electrostatically attracted or repelled, in substance, by the surface of the developing device and by the non-image regions, respectively; a second voltage difference providing an electric field between the surface of the developing device and the non-image regions, the color particles in the non-image regions being completely separated from the surface of the intermediate carrier by the electric field; and a third voltage difference smaller than the second voltage difference and providing an electric field between the surface of the developing device and the non-image regions, the color particles situated opposite the surface of the intermediate carrier in the non-image regions remaining spaced from the latter surface; and a device for performing the method.
REFERENCES:
patent: 3997688 (1976-12-01), Gundlach et al.
patent: 4777500 (1988-10-01), Salmon
patent: 4792860 (1988-12-01), Kuehrle
patent: 5314774 (1994-05-01), Camis
patent: 5581290 (1996-12-01), Kuehnle
patent: 5602578 (1997-02-01), Sumiyoshi et al.
patent: 5889867 (1996-12-01), Yamaguchi
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Lerner Herbert L.
Moses R. L.
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