Canon Staple Finisher-AA1 Service Manual page 57

3. The paper end pushing guide motor (M112) and return roller lift motor (M111) are driven to lift the paper end pushing guide
and return roller. Then the front/rear alignment motors (M107/M108) are driven to move the front/rear alignment plate so that
the paper stacked in the processing tray is aligned in the cross feed direction.
4. Operations described in steps 1 to 3 are repeated for each sheet.
NOTE:
Stack Delivery Auxiliary Function
When the paper of length more than the processing tray is stacked on the tray, the misalignment may occur owing to hanging
down by its own weight. To prevent this, the tray auxiliary guides are pushed out toward the delivery side of the finisher when
the paper of length more than the processing tray is stacked.
Paper End Pushing Guide
Rear Alignment Plate
Front Alignment Plate
Tray Auxiliary Guide
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2. Technical Explanation
M112 M111
Return Roller
M108
Paper
M107