Canon NP6621 Service Manual page 121

a. Set-Back Operations
1. The first copy moves from the delivery assembly to the duplexing unit.
Duplex
iniet detect roller
2. The leading edge of the copy paper butts against the set-back roller 1 and forms an arch.
COPYRIGHT © 1998 CANON INC.
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Set-back roller 1
Figure 3-412
Figure 3-413
Set-back rollers
Figure 3-414
CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
OPERATIONS AND TIMING
Duplex exit
assembly outlet
detect sensor (PS14)
Lower feeder
roller
3–65