Custom Audio Electronics KPM202, User Manual, Page: 95 / 116

11 ALIGNMENT
Device is provided with sensors for the use of alignment notch in order to handle:
•
roll of tickets with pre-printed ields and a ixed length;
•
fan-fold module of tickets with pre-printed ields and a ixed length.
The alignment notch may be formed by (see par.8.7):
•
black mark printed on paper;
• hole between two tickets;
• gap between two labels.
All alignment sensors are “relection” sensors: this kind of sensor emits a band of light and detects the quantity of light
relected to it.
The presence of the notch is therefore detected by the amount of light that returns to the sensor, considering that the light
is relected by the white paper and absorbed by the black mark.
To use tickets with holes or labels with gap, it is possible to use the same sensors as “transparence” sensors, coupled two
by two: a beam of light is emitted by the transmitter sensor and the quantity of light which reaches the opposite receiver
sensor is detected.
The presence of the hole/gap is detected evaluating the amount of light that arrives to the opposite sensor, considering that
the paper doesn’t allow the beam of light to reach the receiver, whereas a gap or a hole lets the light to reach the receiver.
The following paragraphs show how to correctly set the coniguration parameters of device in order to assure the alignment.
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