Apparatus and method for making lithographic printing plates

Details Apparatus and method for making lithographic printing plates Apparatus and method for making lithographic printing plates

1979-02-09

1981-05-12

Moses, R. L.

Photocopying

Including fiber optics

355 10, 355 77, G03G 1528

Patent

active

042668697

ABSTRACT:
Apparatus for making lithographic plates directly from a copy original which comprises, an enclosure which houses a copyboard, an optical train and a carriage. The carriage moves in a horizontal path beneath a platen carrying a sheet of electrophotographic material. The carriage has a corona device, a slit, a toner device including a bias plate and means for withdrawing excess toner.
The copyboard is loaded in a horizontal position, is moved to a vertical position where a light scanning assembly moves over its face in synchronism with movement of the carriage. The pattern on the copyboard is projected horizontally into a pit or optical chamber where it is deviated upward to cooperate with the slit.
The platen is a cover of the apparatus, can be opened after imaging and toning, the toned electrophotographic member then being removed for further processing.

REFERENCES:
patent: 3964828 (1976-06-01), Yamada et al.
patent: 3972609 (1976-08-01), Pfeifer et al.

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