G - Physics – 03 – G
Patent
G - Physics
03
G
32/12, 117/2.9
G03G 15/08 (2006.01) G03G 13/08 (2006.01)
Patent
CA 1194733
ABSTRACT OF THE DISCLOSURE The invention relates to a developing apparatus which, in a preferred embodiment, includes a first charging device comprising a rotating device, preferably deigned as a brush having a core which is connected to a first voltage source. A single component developer is fed, from a developer feed unit, to the first charging device, by means of a metering roller. The charging device is enclosed by a trough, which is connected to a voltage source. A grid, having an associated scraper, is positioned whereby the tips of the brush bristles of the first charging device snap over and past the scraper there- by charging with tribo-electricity and spraying any particles of developer on the bristles onto a developing roller. A second charging device, in the form of a second brush having a core connected to said voltage source may also be used. The grid is then positioned between the charging devices. A second scraper functions, in a similar manner, in conjunction with the second charging device. The developing roller is connected to a second voltage source and particles of developer, which form a uniform layer on the peripheral surface of the developing roller, are attracted by a latent charge image on a recording medium, to thereby obtain a developed charge image.
421169
Haberhauer Helmuth
Spingath Gerhard
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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