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At the start of a job, the sensor level is checked while there is no original, and the threshold value for double feed detection is
calculated. During a job, the Document End Sensor (SR4206) detects the leading edge and trailing edge of each sheet of the
original and compares them with the threshold values at the start of the job to judge whether double feed occurs.
[5]
No.
Symbol
1
REG
2
-
3
JUSO (R)
4
JUSO (T)
5
-
6
SR4206
NOTE:
The Double Feed Detection PCB uses an ultrasonic sensor. With the ultrasonic method, the oscillation portion emits ultrasonic
wave to the paper surface. In the result, new ultrasonic wave is generated as the paper vibrates, and the reception side reads the
ultrasonic wave. A double feed is detected when the oscillation is smaller due to the second sheet of paper.
<In the case of a single sheet>
<In the case of double feeding>
■ Types of jam
● Feed System
Location
01
[3]
[4]
[6]
Registration Sensor
Registration Roller
Double Feeding Detection PCB (Reception)
Double Feeding Detection PCB (Transmission)
Lead Roller 1/2
Document End Sensor
Reception
side
Transmission
side
Reception
side
Transmission
side
Jam code
0001
Delay
0002
Stationary
[1]
[2]
Name
paper vibration
Original
Original (1st sheet)
paper vibration
Original (2nd sheet)
Jam type
Sensor name
Registration Sensor
34
2. Technology
Vibration: large
Vibration: large
Vibration: small
Sensor number
REG
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