Duplex Feeding Unit; Overview - Canon Color iR C3480 Service Manual

Increasing the fixing
feeding speed
Same as process speed
Decreasing the fixing
feeding speed
For plain paper
For heavy paper / OHT
The feeding speeds at the sensor ON / OFF are shown as below.
Process speed
Arch sensor ON
(Increasing the fixing feeding speed)
Arch sensor OFF
(Decreasing the fixing feeding speed)
d. Finishing monitoring the arch
Finish monitoring the arch at the point where the tailing edge of paper passes through the secondary transfer roller.

8.9 Duplex Feeding Unit

8.9.1 Overview

Color iR C3380G / Color iR C2880G / Color iR C3380i / Color iR C3380 / Color iR C2880i / Color iR C2880 / iR C3480 / iR C3480i / iR C3080 / iR C3080i / iR
C2550
At both-sided print in this machine, a paper is reversed at the reversal slot of the delivery assembly outside the machine, returned and re-picked up through the
duplexing feed assembly to the registration roller assembly.
In reversing, keep the trailing edge of paper at 30mm upstream from the reversing roller [1], and stop temporarily with the remained portion delivered outside the
machine from the reversal slot. After that, rotate the reversing roller reversely and return the paper, feed it through the duplexing inlet roller [4] to the duplexing
feed assembly. The delivery motor 3 activates the reversing roller and the duplexing inlet roller.
The duplexing feed assembly has two sets of duplexing feed roller [5] [7]. These rollers feed papers to the registration roller assembly. Duplexing motor activates
the duplexing feed roller.
At the point where the leading edge of
paper reaches the fixing nip
During arch control
PS16 detects large arch PS2 detects small arch
(Approx. 510 msec for A4) (Approx. 108 msec for A4)
Only detection of small arch by PS2
F-8-28
T-8-11
Constant speed
143.0 mm/s
146.8 mm/s
135.0 mm/s
At the point where the
trailing edge of paper
has passed the secondary
transfer roller
Switch PS16 / PS2 due to the
distance of paper delivered from fixing
- LTR or less:
Trail edge of paper 20%
- More than LTR:
Trail edge of paper 50%
Half speed 1 / 4 speed
71.5 mm/s 35.8 mm/s
73.4 mm/s 36.7 mm/s
67.5 mm/s 33.8 mm/s
Chapter 8
0014-0327
8-33