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The Finisher Saddle Paper Alignment Motor (FSPAM) drives the alignment plates each time a

sheet is output, putting both left and right edges of the sheet in order. The Finisher Saddle Paper
Alignment Motor is a 4-phase stepping motor. The position of the alignment plate is identified in
reference to the number of motor pulses from the Finisher Saddle Alignment Plate Home Position
Sensor (FSAPHS).

The following briefly describes what takes place when the saddle stitching mechanism oper-

ates on two sheets.

1) When the first sheet has been output, the alignment plates butt against the left and right edges

of the stack (first alignment). The alignment plates leave the home position in advance and
remain in wait at points 10 mm from the edges of the stack.

Sheets

Paper positioning 
plate

Alignment
plate

Alignment

plate

Finisher Saddle Alignment 
Plate Home Position 
Sensor (FSAPHS)

2) The alignment plates move away from the edges of the stack over a short distance and then butt

against the edges once again (Second alignment).

3) The alignment plates escape to points 10 mm from the edge of the stack.

4) When the following stack arrives, steps 1 through 3 above are repeated.
5) The alignment plates butt against the stack once again, during which stitching takes place.

6) The alignment plates escape to points 10 mm from the edges of the stack, after which folding

and delivery take place.

7) When the first sheet of the following stack reaches the Finisher Saddle Paper JAM Detector 1,

the guide moves to a point 10 mm from the edge of the stack to be ready for the next alignment
operation.

Finisher Saddle Alignment 
Plate Home Position Sensor 
(FSAPHS)

Finisher Saddle Positioning 
Motor (FSPM)

Finisher Saddle Paper 
Alignment Motor (FSPAM)

: Alignment

: Escape

Entry of 

1st sheet

Entry of 

2nd sheet

1st sheet of follow-

ing stack entry

In case of 2 sheets:

[1]: Move to wait position
[2]: Stapling period
[3]: Paper folding/delivery period
[4]: Move to following stack size wait position

[1]

[2] [3] [4]

FSPAM

Finisher Saddle Paper 
Alignment Motor

Alignment plate

Alignment plate

Finisher Saddle Alignment 
Plate Home Position Sensor 
(FSAPHS)

Stack

Paper positioning plate

If alignment was executed with the crescent roller in contact with the stack of sheets, the result-

ing friction against the roller causes the stack to move inappropriately (Figure 3-317). To prevent
this problem, the phase of the roller is identified and used to determine the timing of alignment.

The phase of the crescent roller is identified by the Semilunar Roller Phase sensor (SRPS). The

flag for the Semilunar Roller Phase sensor is mounted to the crescent roller shaft. The flag will
leave the sensor while the roller shaft rotates, turning the sensor ON or OFF, enabling the assump-
tion that the crescent roller is positioned at the opposite side of the stack (Figure 3-319). The align-
ment plates are operated to correspond with this change in the state of the sensor.

Semilunar Roller 
Phase sensor (SRPS)

Flag

Finisher Paper Transport Motor4

Stack

Crescent roller

Alignment plates

FPTM4