Canon DADF-Q1 Service Manual page 59

2) The machine drives the registration roller and the reversing roller for pre-reversal of the original.
For the 1st original, the machine uses the reversing roller to move it over a specific distance after its trail edge has moved past the pre-registration roller paper sensor
(S2), and stops it.
3) The machine uses the reversing roller and the transport belt to move the original.
The machine rotates the transport belt over a specific distance after the trail edge of the 1st original has moved past the reversal sensor (S1), thus determining the
original stop position.
4) The host machine's scanner starts to read the original as part of printing operation.
5) When the host machine's scanner starts to move in reverse, the machine rotates the transport belt to move the 1st original to the reversing assembly. At this time,
the machine butts the lead edge of the original against the reversing roller to remove the skew.
6) The machine rotates the reversing roller and the transport belt to move the original over the copyboard glass.
When the trail edge of the 1st original has moved past the pre-registration roller paper sensor (S2), the machine moves the original over a specific distance using
the transport belt.
Registration roller
Pre-registration roller paper sensor(S2)
Reversing roller
Reversal sensor(S1)
Scanning
(printing)
Scanning lamp
Butting
1st original
F-2-78
F-2-79
Transport belt
F-2-80
F-2-81
F-2-82
Chapter 2
2-37