Pen operability checking system for vector plotters
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United States of America Patent
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Apr 4, 1995
Grant Date -
N/A
app pub date -
May 5, 1992
filing date -
May 5, 1992
priority date (Note) -
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Abstract
Apparatus and an associated method for ascertaining the operational status of a pen in a vector plotter in which a pen is moved into contact with a paper web at a test location, the pen is moved relative to the web and an optical detector is used to determine whether or not the pen is drawing a line on the web. The web is moved from a supply roll to a take-up roll to move the test area on the web to an optical testing location. The absence of a line after a pre-determined period of web movement time signals the inoperative status of the pen and the detection of a line by the pen within that pre-determined period of movement time signals that the pen is operative. Quality and proper line width of the line can also be determined.
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