Infinite loop in Blender

I am working on designing a conveyor belt and am having a problem animating it the way I need it. I know how to create tank tracks that are modified by the bezier curve - but I need this one to be ending at a 90 degree angle or just dropping off and reappearing at the beginning. Basically we want to have conveyor belt sections we can just attach to each other and it will look like one belt but they need to be side by side so no rounded ends.

This video shows a good example of what I am talking about if you scroll to 3:40:
http://www.youtube.com/watch?v=_KsfKje--zA

Any help will be greatly appreciated! Thank you!!