Canon DADF-R1, Service Manual

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Chapter 3
3-30
2) The machine rotates the registration roller and the transport belt to move the 1st original.
When the trail edge of the 1st original has moved past the pull-off roller, the machine starts pickup of the 2nd
original. (advance pickup)
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3) The machine rotates the registration roller and the transport belt to move the 1st original.
The machine moves the 1st original using the transport belt over a specific distance after its trail edge has
moved past the pre-registration roller sensor (S2), determining the original stop position.
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4) The host machine starts printing operation using its scanner.
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5) When the host machine's scanner starts to move in reverse, the machine rotates the transport belt in reverse
to move the 1st original in the direction of delivery. At the same time, the machine rotates the registration
roller to move the 2nd original.
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Registration roller
Transport belt
2nd original
Pull-off roller
Pre-registration
roller paper sensor(S2)
Transport belt
2nd original