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The alignment motor (M5S) drives the alignment plates each time a sheet is output, putting

both left and right edges of the sheet in order. The alignment plate 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 alignment plate home position sensor (PI5S).

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

Alignment plate 
home position sensor
(PI5S)

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 No.1 paper sensor, the guide moves to a

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

Alignment plate home 
position sensor (PI5S)

Paper positioning plate 
motor (M4S)

Alignment motor (M5S)

: 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]

M5S

Alignment motor

Alignment plate

Alignment plate

Alignment plate 
home position 
sensor (PI5S)

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 crescent roller phase sensor (PI12S). The

flag for the crescent 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 assumption that
the crescent roller is positioned at the opposite side of the stack (Figure 3-319). The alignment
plates are operated to correspond with this change in the state of the sensor.

Crescent roller 
phase sensor (PI12S)

Flag

Feed motor

Stack

Crescent roller

Alignment plates

M1S