Booklet maker control of the crescent roller
During alignment, the crescent roller can create friction against the roller causing the stack to move
incorrectly. To prevent this problem, the crescent-roller phase sensor (PI12) identifies the phase of
the crescent roller to determine the timing of alignment. The flag for the crescent-roller phase sensor
is mounted to the crescent-roller shaft. The roller shaft rotates, turning the sensor on and off.
Operation of the alignment plates corresponds with the change in the state of the sensor.
Figure 1-149 Crescent-roller process (1 of 4)
Crescent roller
phase sensor (PI12)
Flag
Feed motor
Stack
Crescent roller
Alignment plates
M1
Figure 1-150 Crescent-roller process (2 of 4)
Alignment plates
Crescent roller
phase sensor (PI12)
If the crescent roller was
in contact with the stack,
alignment operation
could be obstructed.
Sensor flag
Crescent roller
186 Chapter 1 Theory of operation ENWW
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