Develop QC 2235 Plus Service Manual page 180

Mechanical operations
4.3.2 Operations in 2-sided printing with two sheets of paper resident in the sys-
tem
Operation 1
• The first sheet of paper is taken up and fed in from the
main unit drawer and the main unit starts the first print
cycle to produce the print image of the second page of the
original.
Operation 2
• Immediately before the first 1-sided print leaves the Paper
Exit Roller, the direction of rotation of the Paper Exit Roller is
reversed and the first 1-sided print is transported toward and
into the Duplex Unit.
• At the same time, the second sheet of paper is taken up and
fed into the main unit.
Operation 3
• The main unit carries out the first print cycle for the second
sheet of paper to produce the print image of the fourth page
of the original.
• At the same time, the first 1-sided print is transported
through the Duplex Unit.
Operation 4
• The main unit produces the print image of the first page of
the original on the first 1-sided print that has been fed
through the Duplex Unit.
• At the same time, the second sheet of paper is subjected to
a switchback sequence at the exit section and fed into the
Duplex Unit.
• At the same time, the third sheet of paper is taken up and
fed into the main unit.
QC 2235plus Theory of Operation Ver.1.0 Mar. 2004
2-8
Paper Exit
Roller
2
2
4
1 2
6
2
4