Ing C. Olivetti C., S.p.a.

Bruno Cestari

Riccardo Forlani

Giorgio Siletto

Piero Gontero

Piero Bena

The photocopier uses a development process employing a magnetic brush formed on a rotating sleeve (102) of non-magnetic material in which a system of permanent magnets (108) rotates. The outer surface of the sleeve is subjected to a sandblasting process after grinding in order to create a very uniform finely roughened surface in order to make the thickness of the toner layer forming the magnetic brush constant. The photocopier also employs a toner fixing system operating cold and under pressure by means of a pair of rollers (56, 58) of different diameter rotating at the same angular speed in order to create slippage of the upper roller relative to the lower roller for the purpose of obtaining perfectly flat copies. The copier also contains a single circuit board (80) for the low voltage and high voltage supply.

Electrophotographic copier

Device for detaching a copy sheet from the photoconductive drum of an electrophotographic copying machine, wherein the drum has a radial protuberance to which the leading edge of the copy sheet is held by electrostatic attraction and wherein a pick off finger is fixedly mounted adjacent the periphery of the drum at such a distance from the periphery to engage the drum, during its rotation, only in correspondence with the protuberance, so as to detach the copy sheet from the drum.

Growing community of inventors

Collegno (Turin), Italy

Bruno Cestari