Canon STAPLER STACKER SS-72 Service Manual page 42

CHAPTER 2
D. Stapling Operation
1. Outline
In stapling operation, the specified number of sheets of paper are stapled by the stapler unit.
Stapling positions vary according to the staple modes and paper sizes (see table 2-2-2).
Whether or not the stapler unit is in the home position is detected by the stapler home posi-
tion sensor (PI7).
When the power of the stapler stacker is turned ON, the stapler stacker driver rotates the sta-
pler transfer motor (M4) in order to return the stapler unit to the home position. If the stapler
is in the home position, it remains in the position and stands by.
When the leading edge of paper is detected by the entrance paper sensor (PI1), the stapler
stacker driver drives the stapler transfer motor (M4) to shift the stapler unit to the center stand-
by position (Note).
Note: The center standby position is the position for the stapler unit to stand by before the
paper is sent to the staple tray. It prevents the paper on the staple tray from getting
curled, which disables stapling.
Paper size
One point at front
One point at back
Two points in the center
Test staple
See Figure 2-2-11 for
2 - 16
Table 2-2-2
A3 A4 B4 Ledger
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Letter A4R Letter-R Legal Others