3–63OPERATIONS AND TIMINGCOPYRIGHT © 1998 CANON INC. CANON NP6621 REV.0 FEB. 1998 PRINTED IN JAPAN (IMPRIME AU JAPON)C. Duplexing Unit1. OutlineThe machine uses a set-back method and aseparation flapper during continuous two-sidedcopying. The termset-back method refers to amethod of preventing double feeding by stacking(tiling) sheets of paper in the limited space of theduplexing unit. The presence of the separationflapper at the outlet of the duplexing unit serves toimprove separation of sheets.The set-back mechanism is used under thefollowing conditions:1. Copy Paper SizeA3, A4, A4R and A52. Copy CountUp to 10 (A4, A4R) or 2 (A3)Figure 3-409Copy paperSet-backroller 1Duplexing unitlower plate
