Duplexing Unit - Canon NP6621 Service Manual

C. Duplexing Unit
1. Outline
The machine uses a set-back method and a
separation flapper during continuous two-sided
copying. The term set-back method refers to a
method of preventing double feeding by stacking
(tiling) sheets of paper in the limited space of the
duplexing unit. The presence of the separation
flapper at the outlet of the duplexing unit serves to
improve separation of sheets.
Set-back
roller 1
Copy paper
COPYRIGHT © 1998 CANON INC.
Figure 3-409
CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)
OPERATIONS AND TIMING
The set-back mechanism is used under the
following conditions:
1. Copy Paper Size
A3, A4, A4R and A5
2. Copy Count
Up to 10 (A4, A4R) or 2 (A3)

Duplexing unit

lower plate
3–63