Method and apparatus for imaging printing plates by spark discha

Details Method and apparatus for imaging printing plates by spark discha Method and apparatus for imaging printing plates by spark discha

1989-09-27

1991-04-09

Crowder, Clifford D.

Printing

Planographic

Lithographic plate making, and processes of making or using...

101136, B41N 114

Patent

active

050054791

ABSTRACT:
A method of imaging a lithographic plate having a printing surface comprising mounting a plate to the plate cylinders of a lithographic press having at least two plate cylinders, a corresponding number of blanket cylinders and an impression cylinder, exposing the printing surface to spark discharges between each plate and an electrode spaced close to the printing surface produced in response to picture signals, the spark discharges producing sufficient heat to change the affinity of each printing surface for printing liquid at the points thereof exposed to the spark discharges thereby producing image spots on each plate corresponding to the picture signals, moving the electrode relative to the plate to effect a scan of the printing surface, and controlling the spark discharges to the plate in accordance with picture signals so that they occur at selected points in the scan so as to form an image of the original document on the printing surface. Imaging apparatus is also disclosed.

REFERENCES:
patent: 1635299 (1927-07-01), Wohlrabe
patent: 2870253 (1959-01-01), Crosfield et al.
patent: 4729310 (1988-03-01), Love, III

Affiliated with

Also associated with

Rating

Method and apparatus for imaging printing plates by spark discha does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method and apparatus for imaging printing plates by spark discha, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for imaging printing plates by spark discha will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2026309