Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1976-09-16
1979-08-21
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
1525652, 118652, 134 1, 355 3TR, 355 14, G03G 2100, B08B 312, G03G 1500
Patent
active
041651715
ABSTRACT:
Powder particles blemishing the background of a powder image formed by attraction of toner particles to an electrostatic charge pattern on a photoconductive support surface are removed selectively without loss of the image by subjecting the image bearing surface to a limited electric field generated from a wall defining a suction mouth through which the powder particles attracted by this field from the support are sucked away. In an embodiment involving transfer of the powder image, the suction mouth serves also as a protective device for removing all powder particles from the support surface if a receiving material is not in position at the transfer station to receive the image, for which purpose a high voltage is applied at the suction mouth and/or the support surface is treated ahead of the suction mouth to diminish its charges attracting the image particles. Further, any powder particles remaining on the support surface after transfer of the image are removed by subjecting the support surface at a location beyond the transfer station to an electric field from a wall defining a second suction mouth through which these particles are sucked away.
REFERENCES:
patent: 351314 (1886-10-01), Delmage
patent: 3146100 (1964-08-01), Kaufman
patent: 3438706 (1969-04-01), Tanaka et al.
patent: 3536528 (1970-10-01), De Geest
patent: 3659526 (1972-05-01), Staller
patent: 3668008 (1972-06-01), Severynse
patent: 3743540 (1973-07-01), Hudson
patent: 3751156 (1973-08-01), Szostak et al.
patent: 3850519 (1974-11-01), Weikel
patent: 4075011 (1978-02-01), Iwasa et al.
Braun Fred L.
Johnston Albert C.
Oce'-van der Grinten N.V.
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