Patent ID: 8740487

Claim:
A print assembly adapted for use with a print head comprising: a platen operable to move in a first plane; and a vacuum source in fluid communication with the platen to provide a vacuum communication path to draw air through the platen such that a sheet of media arranged on the platen is biased towards it; characterized by a movable aperture in the vacuum communication path between the vacuum source and the platen, the movable aperture being arranged to move with the platen and wherein the movable aperture is provided by a hollow profile and a carriage which is movable on the hollow profile, where the hollow profile and carriage are separate from the plate and are located between the platen and the vacuum source; wherein the carriage is movable with the platen and arranged to create the movable aperture in the hollow profile as it moves on the hollow profile; wherein the hollow profile has an elongate opening having a band to close it at least partially, the carriage operable to separate the band from the hollow profile to provide the movable aperture.