Controlling The Phase Of The Crescent Roller - Canon J1 Service Manual

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Technology > Saddle Stitcher Unit > Controlling the Phase of the Crescent Roller

Controlling the Phase of the Crescent Roller

If alignment was executed with the crescent roller in contact with the stack of sheets, the
resulting friction against the roller causes the stack to move inappropriately.
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 (PI12).
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.
The alignment plates are operated to correspond with this change in the state of the sensor.
Crescent roller
phase sensor (PI12)
Flag
M1
Feed motor
Stack
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Technology > Saddle Stitcher Unit > Controlling the Phase of the Crescent Roller
Alignment plates
Crescent roller
F-2-51
Alignment plates
Crescent roller
phase sensor (PI12)
Sensor flag
Crescent roller
If the crescent roller was
in contact with the stack,
alignment opera-tion
could be obstruct-ed.
Alignment operation
is started when the
flag has covered the
sensor and the
crescent roller is
First sheet Second sheet
Crescent roller phase
sensor (PI12)
Alignment operation
Feed motor (M1)
2-25
F-2-52
F-2-53
Feed motor
stops
F-2-54
2-25