Photocopying – Projection printing and copying cameras – Combined with or convertible to a contact printer
Patent
1980-10-06
1983-05-24
Braun, Fred L.
Photocopying
Projection printing and copying cameras
Combined with or convertible to a contact printer
355 3TR, 355 3CH, 355 14E, G03G 1504, G03G 1522
Patent
active
043847854
ABSTRACT:
A charge quenching apparatus for quenching unnecessary charges on a latent electrostatic-image bearing photoconductor of an electrophotographic copying machine for making copies with clean margins when the size of the maximum-latent-image area on the photoconductor, corresponding to the size of the original, is smaller than the transfer sheet employed, in the unit magnification and in the variable magnification, and for making copies without applying excess load to a cleaning apparatus of the photoconductor when copies bearing part of the image of the original are made or when copies bearing a reduced-size image of the original are made. In the charge quenching apparatus, the size of the maximum-latent-image area selected and the size of the transfer sheet selected are compared, and charges in the area outside the area corresponding to the smaller size determined by the above-mentioned comparison are quenched.
REFERENCES:
patent: 3967896 (1976-07-01), Looney et al.
patent: 4236811 (1980-12-01), Hirose et al.
Katoh Shunji
Nishitsuji Hidefumi
Braun Fred L.
Dunne Gerard F.
Gerber Eliot S.
Ricoh & Company, Ltd.
Shoup Guy W.
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