Canon DADF-Q1, Service Manual

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Chapter 2
2-30
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2) The machine rotates the registration roller and the transport belt to move the original.
When the trail edge of the 1st original moves past the pre-registration roller sensor (S2), the machine starts pickup of the 2nd original.
(if the original is 279.4 x 431.8 mm (11x17), after the original starts to move in 4)
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3) When the lead edge of the original has moved past the post-registration roller paper sensor (S3), the machine rotates the transport belt over a specific distance,
and stops the original (standby position).
(At this time, the machine starts to keep track of the distance over which the 1st original moves after it has moved past the pre-registration roller paper sensor (S2).)
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4) The machine rotates the transport belt to move the original.
When the original has been moved over a specific distance (based on the count reading started when the trail edge of the original has moved past the pre-registration
roller paper sensor (S2)), the machine sends the image lead edge signal to the host machine.
In response to the signal, the host machine starts to read the original. At this time, the machine also moves the 2nd original.
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5) The machine rotates the transport belt motor to move the 2nd original. If the read signal arrives from the host machine before the 2nd original arrives in front of
read position (25 mm + stop distance), the machine does not stop the 2nd original for reading. If the signal does not arrives in front of read position (25 mm +
stop distance), on the other hand, the machine stops the original at standby position and rotates the transport belt for reading of the 2nd original.
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6) The machine goes back to step 2. above and repeats the subsequent steps.
d. Sequence of Operation (large-size original)
1st original
Registration roller
2nd original
Separation sensor(S2)
Standby position
Post-registration
roller paper sensor(S3)
Pre-registration roller
paper sensor(S2)
Pre-registration roller
paper sensor(S2)
Pre-registration
roller paper sensor(S2)