Coin Sorter and Counter

Project Brief

A large number of coins are collected in grocery stores, video game parlors, in buses and at railway stations on a regular basis. However, these coins have to be counted manually. This process is very tiresome and needs a lot of concentration too. The goal was to design a manual machine that could sort as well as count coins based its physical and chemical properties.

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Tags

Coins, count, size, magnetic, sort

Summary

A prototype to sort and count Indian currency coins.

Process Overview

This product was designed in 2006. Only the 4 standard coins available at that time were considered for the experiment.The physical properties of a coin like diameter, weight, and thickness as well as the chemical properties of a coin like material, magnetism were studied. Based on the similarities and differences, they were then categorized. After experimenting with different prototypes, I came up with the final designs.This product was displayed at Techfest 2007 at IIT Bombay. It won the 3rd prize at the Innovision Design Challenge.

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How does it work ?

Different coins such as the 50p, Re1, Rs2 & Rs5 are put into the coin sorter. The spatula ensures that the coins always fall at an angle and hence stack vertically over each other. Based on diameter, the first sorting is done where 50p and Rs5 coins fall in one container whereas the Re1 and Rs2 fall in the other. Each container now has a magnetic and a non-magnetic coin. The next sorting is done on the basis of weight where a magnet is used to further reduce the resultant weight of the coin acting on the spring. To ensure that only one coin is weighed at a time, the pivot of the slot is offset. This offset provides an obstruction until the previous coin moves out. Coins are then counted by their weight.

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This product was displayed at Techfest 2007 at IIT Bombay. It won the 3rd prize at the Innovision Design Challenge.