Wow, I've never seen a pizza vending machine... Where did you see it?
There's no lack of automats in Japan, and most of them dispense food tickets. They can be found in many restaurants.
An onsen I went to in Shimokita (the northernmost part of the main island of Japan) a couple of weeks ago actually had an automat that dispensed tickets for entry, bath towels, toothpastes/toothbrushes and shampoo!
Thanks for your continuing support, Lori! I'm merely imparting my personal experiences here in Japan. but I'm happy to know that it's been useful to at least one person~