The Paper Axis determines the motion of the media through the printer. Its main parts are:

-Paper-Axis Motor - provides traction to the Overdrive.
-Center Platen and Overdrive - controls the printing path and expansion of the media.
-Pinch-wheels and Lever - "captures" the media and provides added friction.
-Center Guide and Entry Roller - feeds media through the paper path.
-Vacuum Fans - provides the required vacuum to maintain the media flat over the Center Platen.

The diagram below illustrates the air flow created by the Vacuum Fans.