Method for the operating an engraving member
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United States of America Patent
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May 25, 2004
Grant Date -
N/A
app pub date -
Feb 17, 2000
filing date -
Jun 3, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a method for operating an engraving member in an electronic engraving machine to engrave printing forms, especially printing cylinders for intaglio printing, a stylus of the engraving member is controlled by an engraving signal and engraves a sequence of cups arranged in a gravure screen in the rotating printing cylinder. The engraving signal is formed by superimposing the image signal representing the tone gradations to be engraved. In order to obtain good quality engraving, the engraving member is heated to a temperature that is close to operating temperature before engraving starts and/or during an interruption of engraving. For this purpose, the engraving member is driven with a periodic signal whose frequency is preferably located inside the ultrasonic range in order to avoid noise disturbances.
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