How do vending machines distinguish counterfeit money?Hình Quốc Phong
Vending machine is a very modern sounding device, but in fact, the idea dates back to … 1st century AD.
The earliest vending machines appeared in England from 1615 and until 1867, the fully-fledged vending machine was officially invented by Simeon Denham (British).
Not a new invention, but have you ever wondered how these vending machines work? Here is the answer.
1. After inserting a coin into the machine, this metal block will pass through a light sensor used to measure the size.
2. The coin then passes through an electromagnet to measure the metal content. It is also the reason that coins come in many shapes and are made from a variety of metals.
3. After identifying the coin, the machine will automatically arrange the coin in its correct column. The counterfeit coins will be moved to reject slot.
4. If there is excess money? The machine will automatically calculate to withdraw coins from the columns and return them. This is the reason that vending machines usually only accept certain currencies.
5. So what if the item you buy gets stuck? Sensors that use infrared rays near the door will confirm that any items have been brought out or not. If not, the coin will be returned to you.