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The following fi gure shows an example of paper with the non-thermal paper printed with black marks and other graph-
ics (for example, a barcode): the outgoing voltage is constant while passing the white paper between two notches,
presents a peak at each black mark and presents some “noise” at each barcode.
In this case, the optimal value for the “Notch/B.Mark Threshold” parameter is located about halfway between the peak
value and the maximum value of the “noise”.
NON-THERMAL SIDE
THERMAL SIDE
“Notch/B.Mark
Threshold”
peak
noise
If the maximum value of “noise” read by the sensor is very close to the peak value, it might be dif fi cult to place the
value of the “Notch/B.Mark Threshold” at an intermediate point. In these cases, it is mandatory that the portion of
paper between the point of printing end and the front notch is completely white (no graphics). In this way, the only
next graphic detected by the sensor for alignment after the printing end will be the notch.
10. ALIGNMENT
User Manual
VKP80III 87