7 ALIGNMENT
Device is provided with sensors for the use of alignment black mark in order to handle:
•
•
The black mark alignment may be formed by
• black mark printed on paper (see
paragraph 9.5
• hole between two tickets (see paragraph 9.5
-
To use tickets with holes, 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 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 hole lets the light to reach the receiver.
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