| 摘要 |
A coin return control system for vending machines is disclosed which includes a predetermined coin denomination detecting portion for detecting the coin denomination predetermined by a coin denomination predetermination switch every time change may have to be paid out by the vending machine. A memory memorizes the coin denomination detected by the coin denomination detecting portion immediately after operating an inventory switch which is a switch other than the coin denomination predetermination switch. A variation detecting portion detects the variation of the coin denomination predetermined by the coin denomination predetermination switch based on the coin denomination detected by the predetermined coin denomination detecting portion and the coin denomination memorized by the memory. An instruction portion instructs the coin paying-out mechanism to return a coin from the auxiliary change retaining tube when the number of coins retained in the change retaining tube corresponding to the coin denomination memborized by the memory is below a predetermined value. A determination portion determines whether or not the instruction portion should instruct the coin paying-out mechanism to return a coin from the auxiliary change retaining tube based on the detected result of the variation detecting portion. Therefore, the coin return control system for vending machines always correctly pays out a necessary coin despite the position of the coin denomination predetermination switch or a faulty read out of the position of the switch.
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