A large capacity automatic printer paper tray operatively mounts a printing device to its upper extent. A paper support is disposed in a frame of the paper tray and is slideably supported by vertical frame rails. A drive screw rotatably secured in the frame is operatively coupled to the paper support. An actuator motor operatively drives the drive screw to raise and lower the paper support. Lower and upper limit sensors control the motor to limit downward and upward movement of the paper support. A paper pick-up interface plate transfers a top paper from the paper support into a paper pick-up roller of the mounted print device, via a feed roller of the print device. A pull-track sensor operates the motor to maintain a top level of paper on the paper support between a minimum and a maximum pull-track threshold.