Xerox Phaser 4500 Service Manual page 50

Theory of Operation
2-14
The paper sizes that can be automatically detected are as follows:
Type
LETTER SEF
LEGAL 14" SEF
LEGAL 13" SEF
EXECUTIVE SEF
A4 SEF
B5 (JIS) SEF
A5 SEF
Paper Lift Mechanism
The Phaser 4500/4510 printer paper trays utilize a unique mechanical paper
lift mechanism that eliminates the need for paper lift motors. The mechanism
consists of a spring-loaded bottom plate assembly that lifts the paper stack
upward to the paper feeder assembly.
When the tray is removed from the printer, a channel in the right tray guide
pushes the bottom lock gear downward, lowering the bottom plate assembly
until it is locked into place by a spring-loaded gear stopper, one-way lock gear,
and the bottom rack lock. The gear stopper engages the bottom lock gear,
and the bottom rack lock engages the one-way lock gear, which prevents the
bottom plate assembly from rising upward.
The gear stopper is released from the bottom lock gear when the tray is
inserted into the printer. Once the gear stopper releases the bottom lock gear,
the bottom rack lock holds the bottom plate assembly in place. Then, a metal
tab located on the paper feeder assembly presses down on the bottom lock
lever. This releases the bottom rack lock and allows the bottom plate
assembly to raise the paper stack upward until it contacts the nudger roller
and lifts the feeder assembly.
Once the feeder assembly is lifted by the paper stack, the metal tab no longer
contacts the lock lever. As paper is fed from the stack, the feeder assembly
gradually lowers. When the tab contacts the bottom lock lever, the paper stack
raises. This process repeats until the tray is empty.
Size (mm × mm)
215.9 mm × 279.4 mm (8.5" x 14")
215.9 mm × 355.6 mm (8.5" x 13")
215.9 mm × 330.2 mm (8.5" x 11")
184.2 mm × 266.7 mm (7.25" x 10.5")
210.0 mm × 297.0 mm (8.27" x 11.69")
182.0 mm × 257.0 mm (7.17" x 9.44")
149.0 mm × 210.0 mm (5.83" x 8.27")
Phaser 4500/4510 Service Manual