I have seen this laminator before, At that time i know that it was hooked up to an air compressor, so that tells me it is air driven, they were laminating 36" wide roll of vinyl using probably the same size laminate that they have now loaded on it which is 38", he tells me that he uses this size all the time for the work he is doing and that he never needed to change to a different size. Also portlandsignguy mentioned that the laminate needs to be centered and from what i remember their laminate was not centered but was installed all the way to one of the ends, like if you are looking or standing in front of the machine it was installed all the way to the right end. While they were laminating the finished product was taped to a take up reel and that was working fine.
I will play with it a lot when i go to see it.