Photocopying – Including fiber optics
Patent
1983-04-06
1985-01-22
Prescott, A. C.
Photocopying
Including fiber optics
355 11, 355 45, G03G 1500, G03G 1526
Patent
active
044948590
ABSTRACT:
A reader/printer apparatus includes a main frame having an optical system for exposure of photocopy paper with the image on a film carrier in combination with an integrated modular developing station which is adapted to receive any one of a plurality of different developer modules. Each module is a self-contained plug-in type structure and includes a dry silver paper developer module and an electrostatic developer module are provided. Each module includes an infeed unit and a discharge unit for passing the paper from the exposure unit through the developer module. The dry silver module includes a suitable transfer roll and mating heating bars for developing the exposed dry silver paper. The electrostatic module includes a magnetic toner brush assembly to deposit toner particles in the image area. Each module includes an essentially identical rectangular frame structure corresponding to a rectangular developer chamber having a suitable guide means. Either of the modules is directly mounted into the developer chamber, with the infeed unit aligned with the discharge unit from the exposure station and a discharge unit aligned with an exit opening. A corona charging module is releasably mounted in the reader/printer immediately upstream of the entrance into the exposure station or unit. This module charges the photoconductive paper for electrostatic printing prior to entrance into the exposure station. The charging module is replaced with a transfer guide for dry silver printing. The charging may be negative or positive. A power supply switch includes a dead band area in switching from one polarity to the other and includes a pair of electromagnetic vacuum enclosed reed switches connecting the high voltage to the corona charging wires.
REFERENCES:
patent: 3877805 (1975-04-01), Heldenbrand et al.
patent: 3951543 (1976-04-01), Mulligan
patent: 3986771 (1976-10-01), Tsukada
patent: 4113377 (1978-09-01), Sone et al.
patent: 4278346 (1981-07-01), Toriumi et al.
Frias Ronald J.
Jagielski David
Schetter Nicholas R.
Micron Corporation
Prescott A. C.
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