Apparatus and method for making lithographic printing plates
US4266869A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1979 |
| Grant date | May 12, 1981 |
| Priority date | — |
| Expiry date | Feb 9, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/22
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.