- H: 371mm W:138mm D: 80mm
- MDB interface: multidrop bus, serial bus, standard since 1995: simple protocol, add different features is easy (smartcard, coin exchanger, bill acceptor, card reader; only 1 per feature)
- easy accesible path: maintenance; (dust -> wrong screening)
- non optical
- 4 high capacity exchange tubes: 20 x 5cent, 10 cent, 20cent en 50cent. 1 en 2 euro directly fall into cash register.
- always return possible: at first the tubes are filled as the machine receives coins. When filled, the rest falls into the register.
Imagine everyone pays with 1 and 2 euro coins and the tubes get a lack of coins to exchange. Then the machine will first ask to pay with a fit amount. ( Research: this message causes 50% less buyers). Worst case scenario: the machine cannot return.
This system is modern, so electronic driven. This is less interessting, so here I described a older system that is more based on mechanics.
- coin recognition: 2 coils, there is a current running through the first one, creating a magnetic field. The second coils catches this fields whereby a current is initiated into the second coil. When a coin passes through these coils the magnetic field is changed by its alloy. The current in the second coil changes and is so a measure for the alloy of the coin. When the current matches with the system that is preprogrammed, the coin goes to the next stage. By its weight the coin activates a button that leads up to an electromagnet. The elctromagnet closes the coin entrance for a little while so the coins cannot follow each other too fast. The coin now rolls onto a set of weighers, ordered by diameter. The coin gets stuck at its right diameter, it's weighed with a contraweight. If the contraweight is lifted the weigher will turn so that the coin can proceed its path to the right tube or the register. So the diameter has to match with the weight. It important for this process that the machine stands level.
Older system
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