an apparatus for transporting a sheet comprising : a first roller ; a second roller ; and an assembly for mounting the second roller for movement between a position spaced from the first roller and a position engaging the first roller for transporting a sheet ; wherein the second roller has first and second ends , and wherein the assembly includes independently spring loaded link assemblies respectively on the first and second ends of the second roller that ensure that the second roller will always close down on both sides of the first roller with uniform pressure on both sides .