Media sheet conveyance with transport assemblies

A system for conveying a media sheet, comprising:

• a first transport assembly, including
• a set of endless belts positioned in parallel, the set having a plurality of rows of holes including a first edge row and a second edge row, the rows being separated by a distance “x”;
• a set of drive rollers operatively connected to the set of belts, to circulate the set of belts above a set of vacuum elements;
• the set of vacuum elements to apply a negative pressure through holes of the set of belts;
• a plurality of subject transport assemblies, each including
• an endless subject belt having fewer rows of holes than the set of endless belts and including a subject edge row of holes, with a distance between the subject edge row and a nearest edge row of an adjacent belt that is less than or equal to the distance “x”,
• a subject drive roller operatively connected to the subject belt to circulate the subject belt above a subject vacuum element;
• the subject vacuum element to apply a negative pressure through holes of the subject belt;
• and
• a controller to control the set of drive rollers to circulate the set of belts above the set of vacuum elements, and to control a subject drive roller to circulate a subject belt above a subject vacuum element, to convey a media sheet.

A printer comprising:

• a plurality of print agent application elements to apply a print agent to a media sheet within a print zone;
• media sheet conveyance system, including
• a first transport assembly, including
• an endless first belt set having a plurality of rows of holes, the plurality including a first and a second edge row separated by a distance “x”;
• a first drive roller operatively connected to a drive surface of the first belt set;
• a first vacuum element set positioned adjacent and beneath the drive surface of the first belt set;
• a first encoder unit positioned within the print zone to measure movement of the first belt
• a plurality of subject transport assemblies, each including
• an endless subject belt having a subject edge row of holes, with a distance to a nearest edge row of an adjacent transport assembly being less than or equal to the distance “x”,
• a subject drive roller operatively connected to a drive surface of the subject belt;
• a subject vacuum element positioned adjacent and beneath the drive surface of the subject belt;
• a subject encoder unit within the print zone to measure movement of the subject belt;
• and
• a controller to control the first drive roller and the subject drive rollers to move a media sheet through the print zone, including controlling the first drive roller to circulate the first belt set over the first vacuum element set and controlling a subject drive roller to circulate a subject belt over a subject vacuum element, wherein the controller is operatively connected to the first encoder unit and to each of the subject encoder units, and is to control the first drive roller and the subject drive rollers based upon belt movements measured by the first encoder unit and the subject encoder units.