Master Thesis - Fachbereich Informatik
Master Thesis - Fachbereich Informatik
Master Thesis - Fachbereich Informatik
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3.4. BLOW OUT MECHANISM 49<br />
A light barrier is used to send a signal to the controller when a tube is placed in front<br />
of the air blow nozzle. If the first entry in the FIFO buffer contains a B, thetubehasto<br />
be blown out and the air blow nozzle is activated. On the other hand, if the first entry<br />
contains an A, the tube can pass. In both cases the first entry in the buffer is deleted.<br />
The advantage of this approach is that the current conveyor velocity does not have to<br />
be known to compute the time a tube needs to move from a point x on the measuring<br />
area to the position of the air blow nozzle. The light barrier guarantees the blow out is<br />
activated when the tube is exactly at the intended position.
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