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like the successful collision repairs of the past she look good dude hey why don't we do a thing about cheese the first coin-operated vending machine dates back to 200 BC when hero of Alexandria described a coin-operated device that dispensed holy water in an Egyptian temple what if they kicked it when it failed to dispense I have the world's simplest vending machine here take a candy leave me a penny well it's not the function of the Acme school to make sad commentaries on contemporary society so let's just jump past the rest of that example to the fact that my vending machine I need to ensure that you left me a coin I need to determine its denomination and I need to make sure it's a coin that's um round thing you found in the basement I need to count the coins and if I want to sell even more candies make change if I want to be nice I'll have my machine give you your money back if I'm out of candy or if anything else goes wrong if I want to be real nice I'll give you the chance to get the coins you inserted back if you find you don't have enough change to make the whole amount a lot of knitting machines won't forgive that mistake this unit is found in millions of vending machines the heart of its what used to be called the slug rejecter nowadays they call them coin acceptors happy commentary on contemporary society don't try to slip my slug though they'll reject it it's a slug rejecter of coin acceptors job to verify that the coins are genuine and to sort them into nickels dimes and quarters sometimes 50 senses and dollars this unit only handles nickels dimes and quarters the sizes are sorted with rotating cradles arranged in order of size a quarter will tip this top cradle nickels and dimes fall right through and nickels tip the second cradle dimes fall through to the third one anything smaller than a dime shame on you will fall through to the coin return an extra widget on top of the quarter cradle will reject anything larger than quarter came on you again after the coins are separated by the cradles they roll down inclined planes and undergo various tests the details vary from unit to unit but a combination of levers and carefully placed bumpers check the coin for weight and type of metal if the coin doesn't pass these tests falls into the coin return some of the things that the acceptor rejects will get stuck in it that's where this comes in this lever is connected to the coin return button it opens up the acceptor and wipes a finger through the places where things might get stuck the unit fits in here these fingers are controlled by the coin return electromagnet if all's well with the vending machines the fingers are held out of the way by the electromagnet that the machines out of product or if it's unplugged the fingers poke into the acceptor unit and force all the coins to be returned switches located under the nickel dime and quarter slots activate each time one of those coins passes this bank of switches sets the price for binding going from left to right they're equal to five cents 10 cents 20 cents 40 cents $87 60 various combinations of the switches will give any amount from 5 cents to 3 dollars and 20 cents this one's set for 15 cents now when you start inserting coins into a coin unit they drop immediately into the cash box so if you want to abort the transaction the coins are no longer available some machines that take a lot of coins like cigarette machines will hold your coins in escrow and return them to you if you push the coin return these tubes or where your change comes from if the tube isn't full inserted nickels will drop into the tubes instead of the cash box the tubes are full of flap redirects the nickels into the box when it comes time to make change a motor underneath dispenses the correct number of nickels into the coin return there's a switch at the bottom of those tubes that lights the use correct change like pretty neat but technology marches on if you're in the coin business one thing you notice is that those pesky government's keep changing the coins their size their metal contents their value the high-priced model it takes a new dollar coins to the acceptor has been simplified to infrared light beams and a metal detector the time it takes for the coin to break the two light beams on its way past tells the Machine whether it's nickel dime or quarter sized the metal detector hiding under the plastic there makes the final decision much the same way that most metal detectors will ignore valuables and find junk on the beach this one has inventory tubes for nickels dimes and quarters it will attempt to make change in the most efficient way that owes your 30 cents it will try to give you a nickel and a quarter the town of porters will try three dimes if that fails it will dump a load of nickels on you you'll even pay back four coins in the cash box this connector interfaces with the dollar bill acceptor now no discussion on coin acceptors would be complete without a detailed discussion of the dollar bill acceptor well I can't tell you about the dollar bill acceptors because they won't tell me about them apparently they're not quite as foolproof as the coin acceptors little knowledge is a dangerous thing so tune in next decade paper money will be obsolete and we'll take a look at how the dollar bill accept