Canon iR C1020 Series Service Manual page 199

Duplexing feed sequence
1) The feed roller driven by the fixing motor (M1) delivers the paper in which fixing was performed on the first side from the fixing unit.
2) When a specified period of time elapses after the fixing delivery sensor (SR6005) detects the lead edge of the paper, the duplexing feed motor (M10) and the
reverse motor (M11) rotate forward.
The paper moves to the reverse assembly while pressing up the self-weight flapper.
3) When a specified period of time elapses after the reverse sensor (SR706) detects the lead edge of the paper, the reverse motor (M11) stops.
This specified period of time varies depending on the paper length.
The paper which passed through the reverse roller before the reverse motor stops is temporarily stored at the back of the machine.
4) The reverse motor rotates in reverse.
When the reverse motor rotates in reverse, the paper is transported to the opposite direction.
Self-weight flapper
M11 M10
Paper
M11 M10
Reverse roller
SR706
M1
SR6005
F-9-15
F-9-16
Chapter 9
9-15