Apparatus for the densitometry measurement of printed products
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United States of America Patent
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Sep 10, 2002
Grant Date -
N/A
app pub date -
Sep 15, 2000
filing date -
Sep 17, 1999
priority date (Note) -
Expired
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Abstract
An apparatus is described for the densitometric measurement of printed products such as sheets printed by sheet-fed offset printing machines, having a densitometer measuring head. The head moves along a measurement strip comprising a number of measurement fields and generates signals that are converted into ink density values in a downstream evaluation unit, which is assigned to ink metering zones. The evaluation unit comprising a computer that contains stored information about the arrangement of the measurement fields of the printed colors in each metering zone. The ink density values from one measurement field are compared with the ink density values from neighboring measurement fields of the same color and type in accordance with the known structure of the measurement strip. The invention provides for the simple and fail-safe arrangement of the measurement-field colors in the individual ink metering zones.
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