Electrophotographic copying machine for producing positive print

Details Electrophotographic copying machine for producing positive print Electrophotographic copying machine for producing positive print

1987-08-31

1989-05-30

Grimley, Arthur T.

Photocopying

Contact printing

Light boxes

355268, G03G 1500

Patent

active

048355690

ABSTRACT:
The present invention relates to an electrophotographic copying machine which is capable of producing positive copies from both positive and negative originals. According to the invention, two units of developing apparatuses, each containing a toner with a polarity opposite to each other, are selectively mounted in position on the main body of the copying machine according to whether the copying is from positive to positive or from negative to positive so as to apply to the transfer charger a voltage with a polarity opposite to that of the toner.

REFERENCES:
patent: 3877803 (1975-04-01), Seliger
patent: 4166691 (1979-09-01), Ebi et al.
patent: 4299474 (1981-11-01), Ernst et al.
patent: 4500195 (1985-02-01), Hosono
patent: 4627703 (1986-12-01), Suzuki et al.

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