Method and apparatus for monitoring plates in marking device

Details Method and apparatus for monitoring plates in marking device Method and apparatus for monitoring plates in marking device

1992-03-16

1994-04-26

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

382 1, 348 95, 348 92, G06K 900

Patent

active

053074203

ABSTRACT:
A method for monitoring conditions of printing plates in a marking device which uses relief-plate printing. The method employs a camera installed beneath a movable printing plate so that the condition of the printing plate is checked via the camera. A device utilizing such a method includes a plate holder to which the printing plate is attached, an X-Y-Z driver which moves the plate holder in X, Y and Z directions, a camera installed with its photographing side facing up and positioned away from a workpiece carrying table which positions and carries a workpiece that is to be printed, an image processor which processes image signals from the camera, and a monitor which displays images in accordance with the output of the image processor. Thus, the printing plate is photographed by the camera and its condition is checked.

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