Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1977-01-07
1978-12-12
Moses, R. L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 7, G03G 1500
Patent
active
041293789
ABSTRACT:
Electrophotographic copying machine comprising a discharge device for discharging the area of the movable photoconductive element which exceeds the area of the copy-sheet residing in the machine. The discharge device comprises a lamp and a mask interposed between the lamp and the photoconductive surface, the mask has a plurality of slots, each slot being associated to a copy-sheet format; each slot comprises a first portion for discharging the margin zones of the photoconductive element, which zones has a length equal to the difference between the width of the photoconductive element and a dimension of the copy-sheet format selected; and a second portion for discharging the entire width of the photoconductive element, the second portion is positioned in front of the lamp after that a length of the photoconductive element equal to the other dimension of the format has been moved in front of the discharge device.
REFERENCES:
patent: 3751155 (1973-08-01), Liechty
"Shutter Assembly for Selectively Erasing Nonimage Areas of a Photoconductor Segment," IBM Tech. Bull. vol. 16, No. 4, Sep. 1973, pp. 1262-1263.
Guelfo Roberto
Rattin Luciano
Hulbert W. R.
Ing. C. Olivetti & C. S.p.A.
Moses R. L.
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