If you have been to a krispy kreme store, you probably noticed the assembly line for making donuts. I am interested specifically in the oven part of the line where the donuts go up and down and up and down... (refer to picture). I wanted to find more information on that specific type of conveyor, but don't know what to google for besides "krispy kreme conveyor" (which isn't giving me decent results). If you know the proper name for it, please let me know (letting me know how you know it would be great too). Thanks a lot.