“I see two possible solutions”
Both good descriptions of scanners in the Real World, but given the representation of the scanner as a 1/2" (less?) thick, flatbed assembly outside the path of the paper off the roll, neither is consistent with the device as pictured.
If this thing were ever actually produced, you know there would be a stupid list of steps requiring the user to remove the roll paper from the feed mechanism, then load the document to be scanned in its place to be pulled past the print/scan head. And since it’s virtually impossible to load a sheet of paper perfectly straight, even in a flatbed scanner, you know the source doc will feed crooked, probably wrinkling and/or tearing one edge and creating a crooked duplicate.
