Custom Audio Electronics KPM150H, User Manual

Page: 75 / 96

10 ALIGNMENT
Device is provided with sensors for the use of alignment notch in order to handle:
•
roll of tickets with pre-printed fi elds and a fi xed length;
• Fan-Fold module of tickets with pre-printed fi elds and a fi xed length.
The alignment notch may be formed by
•
black mark printed on paper (see par.7.6);
• hole between two tickets (see par.7.8);
• gap between two labels (see par.7.7).
All alignment sensors are “re fl ection” sensors: this kind of sensor emits a band of light and detects the quantity of
light re fl ected 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 re
fl ected by the white paper and absorbed by the black mark.
To use tickets with holes or labes 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, consider-
ing 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 con fi guration parameters of device in order to assure the
alignment.
10. ALIGNMENT
User manual
KPM150H 75