Engraver and method for focusing and measuring areas on a workpiece engraved by the engraver
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United States of America Patent
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Sep 2, 2003
Issued Date -
N/A
app pub date -
Mar 16, 1998
filing date -
Feb 25, 1993
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An error detection apparatus and method for use with engravers, such as gravure engravers. An error value E corresponding to the difference between a set of predetermined setup parameters and actual measurement of a portion of an engraved area on the cylinder is determined. The error value E is then used to adjust the engraver to engrave an actual cut or etch in accordance with the set of predetermined setup parameters. Advantageously, an error detection and correction system is suitable for providing a closed-loop system for engraving a cylinder. The apparatus and method may be used during initial setup or during normal operation of the engraver. Other features include an autofocus routine to facilitate the auto-focus procedure. Also, image processing is further enhanced by gap filling, discontinuity removal, and light calibration methods which may be used alone, in combination with each other, or in combination with the automatic focus system and/or automatic shoe system.
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