I use an roller chain generator that I found on the web for generates the chain and I use Autodesk Inventor design acceletator for the sprockets

In most factory situations, one will simply butt up to the other, or sometimes end over the top of the other, and the piece or package will just be caught by the second belt, with a piece of sheetmetal to guide it on, or else it will drop a few inches onto the other conveyor.

cooool