Photocopying – Contact printing – Light boxes
Patent
1994-05-31
1996-01-09
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355296, G03G 1502
Patent
active
054833230
ABSTRACT:
In an electrophotographic apparatus using a charging apparatus for contact charging, the charging apparatus includes a flexible and hollow electrically conducting roller, and an electrically conducting brush roller which is provided in the hollow roller in concentric therewith and to rotate relative thereto, wherein a charging voltage is applied to the hollow roller via the brush roller, and the photosensitive material is electrically charged by rotating the hollow roller by bringing it into physical contact with the photosensitive material, and the hollow roller is brought at its both end portions into press-contact with the end portions on the surface of the photosensitive material and is rotated by being driven by the photosensitive material. In this apparatus, the hollow roller that comes into contact with the surface of the photosensitive material is driven at substantially the same speed as the photosensitive material, whereby slipping and wear are effectively prevented from occurring on the surface of the photosensitive material, durability of the photosensitive material is not lost, the hollow roller that is subject to be easily deformed is effectively prevented from being twisted, enabling the electric charging to be carried out stably and uniformly For extended periods of time.
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Gotoh Eiji
Matsuda Masanori
Nishida Akinori
Grimley A. T.
Lee Shuk Y.
Mita Industrial Co. Ltd.
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