HP LaserJet Enterprise M552 - Tray 2 presence detection; Tray 2 skew feed prevention

Figure 1-33 Tray 2 multiple-feed prevention
Tray 2 separation roller
follows the Tray 2 feed roller
Driving force from
the pickup motor
Normal feed
Multiple feed
Paper
Tray 2 pickup roller
Tray 2 separation roller
Tray 1 feed roller
Tra
y
2 separation roller
fo
ll
o
w
s
the Tra
y
2
f
eed roller
Drivin
g
f
orce
f
rom
the pickup motor
N
o
rm
a
l
feed
M
ultiple
f
ee
d
Paper
Tra
y
2 pickup roller
Tra
y
2 separation roller
Tra
y
1
f
eed roller
Tray 2 presence detection
The Tray 2 presence sensor is in the lifter drive unit. The sensor detects the tray-presence sensor ag and
determines whether the cassette is installed correctly.
Tray 2 skew feed prevention
The printer can straighten the paper without slowing the feed operation.
1. The leading edge of paper strikes the registration shutter, and the leading edge is aligned with the
shutter.
2. As the feed rollers keep pushing the paper, the paper warps.
3. When the force is great enough, the registration shutter rotates, and the paper passes through
straightened.
ENWW Pickup, feed, and delivery system 57