| 摘要 |
PURPOSE: A vending machine is provided to keep selling products when products are still available while changes are not available preventing unreasonable situations from happening. CONSTITUTION: In a vending machine, when changes have run out, two buttons are provided for purchasing without getting back changes and purchasing certain number of products corresponding to the input coins or bill. When a button for purchasing without getting back changes is pressed and more money is input than a single product, the user can select and receive the product within the amount of input money. After releasing the product, the machine returns to the waiting mode. When a button for purchasing certain number of products corresponding to the input coins or bill is pressed and certain amount of money is input, the user can select and receive the products corresponding money. After releasing the products, the machine returns to the waiting mode. |
