I mocked up a fast/slow moving arm mechanism in the hopes that it will be useful in a rough idea for grabbing the bill as it comes out of the dollar bill acceptor and whipping it across to some sort of storage.

I found some plastic timing gears (with brass inserts and set screws) and toothed belts from Stock Drive Products (https://sdp-si.com/eStore/) which made it easy to drive the 10" wheel.








But the problem now is that the arm must return to the same spot each time it cycles and ideally it should only cycle once.