This is great - reminds me of the potato chip factory. We used to go on factory tours of things like this with my daughter when she was small because its cool to see where stuff came from.
So the potato chip line had a station that sorted out brown and green chips. How it worked was when they came out of the fry onto a belt there was a scanner that saw the green chips and noted the position, then the conveyor accelerated to throw the chips over a small gap jumping to the next conveyer, but halfway across the gap was a series of small air jets that would make a puff of air, enough to push the green chip down at just the right moment, and just enough to miss the jump and fall into the reject basket. And sure enough the basket was filled with brown and green chips.
