Canon Finisher-AB1 Service Manual page 256

Chapter 3
3) If the machine is in job offset mode, the shift roller unit is moved to the front or the rear as in the case of
horizontal registration correction operation (Note), thereby offsetting the stacks of sheets discharged to the
delivery tray.
[1] [1]
[2] [2]
F-3-16
This time, the degree of shift is determined with the horizontal registration correction taken into account.
3-17