Xerox PHASER 7500, Service Manual

Page: 83 / 992

Phaser 7500 Printer Service Manual 2-23
Theory of Operation
Paper Feed from the Paper Tray
Upon insertion of Paper Tray, the mechanisms (1), (2), and (3) raise the Bottom
Plate to press it against the Feed Roll, while the Nudger Roll is lowered (4). At the
same time, reverse rotation (CCW direction) of the Tray Feed/Lift Motor raises the
Bottom Plate of the Paper Tray until the paper reaches the Feed Position (5).
As the paper feed from the Paper Tray is starting, forward rotation (CW direction)
of the Tray Feed/Lift Motor rotates the Nudger Roll, Feed Roll, and Retard Roll. The
paper is fed in between the Feed Roll and Retard Roll by the Nudger Roll and then
transported towards the Takeaway Roll by the rotation of Feed Roll and Retard Roll.
The spring pressure and the Retard Roll press against the Feed Roll to perform the
role that separates paper by using rotation resistance (6).
When there is paper overlap, the brake force of the Torque Limiter that is linked to
the Retard Roll separates the top most paper from the rest and feeds it.
Tray Feed/Lift Up Motor
Nudger Roll
Feed Roll
Retard Roll
s7500-360
Nudger Roll
Bottom Plate
Retard Roll
1
2
3
4
4
5
6