Patent ID: 7988150

Claim:
A machine comprising: a processing device; a roller; an axle extending through a center of said roller, said roller rotating about said axle so as to transport a print medium past said processing device, and said roller comprising a support surface and said support surface having an outer side contacting said print medium, an inner side, and perforations extending from said outer side to said inner side; a vacuum chamber within said roller, said vacuum chamber comprising a rigid enclosure positioned between said axle and said inner side of said support surface and having an open end facing said processing device such that said open end is adjacent to only a portion of said inner side of said support surface, said portion being less than half a circumference of said roller, said roller further rotating about said axle past said open end, said vacuum chamber applying vacuum pressure to said print medium through said perforations so as to secure said print medium to said outer side and maintain said print medium at a uniform predetermined distance from said processing device as said print medium is transported, by said roller, past said processing device, and said vacuum chamber comprising at least one movable wall allowing a first width of said open end of said vacuum chamber to be selectively adjusted based on a second width of said print medium, said first width and said second width being measured in a direction perpendicular to a direction of travel of said print medium; a sensor measuring said second width of said print medium; and a controller receiving said second width from said sensor, said controller further being operatively connected to said vacuum chamber and causing said at least one movable wall to move so as to ensure that said first width of said open end is approximately equal to and aligned with said second width of said print medium.