Printer vacuum conveyor with adjustable active area

A printing system, comprising:

• a driving belt configured to drive media through the printing system relative to one or more print heads;
• and
• a vacuum conveyor system, including:
• a vacuum chamber cover having:
• an active area with a length and a width;
• a first surface;
• a second surface opposite the first surface;
• and
• a plurality of slots each extending longitudinally across the length of the active area of the vacuum chamber cover, each slot forming an opening through the vacuum chamber cover from the first surface to the second surface;
• for each respective slot of the plurality of slots, a seal disposed within and extending along a length of the respective slot of the plurality of slots, the seal drivable by an actuator to open or close the respective slot;
• a controller configured to detect a width of the media and determine, based on the width of the media, one or more of the slots that are outside an area covered by the media, wherein the controller actuates the seals corresponding to the one or more determined slots to close the one or more determined slots;
• and
• a vacuum chamber below the second surface of the vacuum chamber cover and configured to apply vacuum to the media through one or more openings to constrain the media on the driving belt by flattening the media against the driving belt.