No, these are set up like vending machines. You pour in your coins and it gives you a receipt that you take to the checkout (or teller window at the credit union) to get refund or paper cash. I think they only took out 3% at the grocery store.
The one in my store looks like this. It also gives you the choice of cash, but it's 11% on these ones in my neck of the woods. My credit union does it for free. I have found way more silver in these then I have in all my years metal detecting. :-)