I was fiddling around a while ago on a small ball machine, and decided to try to make a alternate way of bringing the balls to the top of the machine in a way other than a chain lift. Well, this is what I came up with. It is a bit primitive, but I like it nonetheless. It is fun to watch. Also, it uses few pieces (granted more black y connectors than I would have liked), so it is easy on the people with few pieces.
Remember that this is just a concept, and you should make it the way you want. You can stack them on top of each other to make them go higher, make the wheels(s) larger, and mix them up the way you want.