Canon iR1020 Series Service Manual page 158

Chapter 10
[2] Forward Pickup/Reversal Delivery Operation
The document flow is shown below.
MEMO:
This operation is performed for all double-sided documents irrespective of whether document widths are the same.
10-4
Document
Pickup
Formation of loop
Reading
Feed
Next
F-10-4
Reversal
Feed
Idle feed
F-10-5
Reversal
Formation of loop
Reverse side reading
Feed
Delivery
End of job