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(11) | EP 0 127 831 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Closed loop register control |
| (57) A closed loop register control system used in association with a printing press and
comprising a television camera in combination with a strobe light and a solid state
imaging device which enables continuous scanning of the sheet web. The apparatus of
this invention also comprises a printing press console having associated therewith
a digitizing tablet and a television monitor. The location of the area that is to
be examined is defined by the pressman. The area to be examined may be selected by
laying a proof sheet down on the digitizing tablet and recording the coordinates of
the area of interest. This controls the camera and strobe light with the pressman
selecting one part of the image as important and causing the register mechanism to
maintain register in that selected area. Electronics then making comparisons between
the detected image and a desired reference image to cause correction on a per color
basis at the printing press stations. |