Photocopying – Including fiber optics
Patent
1975-11-12
1978-03-28
Braun, Fred L.
Photocopying
Including fiber optics
96 14, 355 15, 427 24, G03G 1500
Patent
active
040812120
ABSTRACT:
In transferring powder images from a moving photoconductive support to a receiving material such as copy paper passing in contact with the support over a transfer roller, while both applying a direct current potential to effect image transfer and brushing the surface of the transfer roller to remove powder particles attracted to it from parts of the support. A potential effective for transferring the image is applied without hampering the cleaning action of the brush or brushes by maintaining between the support and the transfer roller a pulsating direct current which, for instance, has a frequency of 60 Herz or 50 Herz and preferably is generated by single phase rectification of a current formed by superimposing a sinusoidal alternating current and a direct current. The time interval between interruptions of the direct current potential is in any case kept less than both the contact time between the receiving material and the transfer roller and the contact time between the brush and the transfer roller, and the former contact time is preferably kept considerably longer than the latter.
REFERENCES:
patent: 3464818 (1969-09-01), Waly
patent: 3781105 (1973-12-01), Meagher
patent: 3795025 (1974-03-01), Sadamitsu
patent: 3819263 (1974-06-01), Draugelis et al.
patent: 3860857 (1975-01-01), Namiki et al.
patent: 3877416 (1975-04-01), Donohue et al.
patent: 3907421 (1975-09-01), Jordan et al.
patent: 3918966 (1975-11-01), Metcalfe et al.
Braun Fred L.
Johnston Albert C.
Oce'-van der Grinten N.V.
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