Rotation Encoder - Ricoh J-P3 Service Manual

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Rotation Encoder

An encoder [C] is on one of the rollers. This encoder checks the rotation speed of
the transfer belt. The controller analyzes the signals from the encoder, and adjusts
the rotation speed of the transfer belt.
The encoder contains a disk that has 300 notches on its surface [B]. These
notches are read by the sensor [A]. The controller counts the number of notches
that the sensor has read in the unit of time. If the sensor has read an unusually
large number of notches or an unusually small number of notches, the controller
ignores such unusual signals. Thanks to this feature, incorrect reading does not
affect the rotation speed.
Number of notches
(read by the sensor)
Filter H: The number of notches read by the sensor when the rotation speed of the transfer belt is
at its possible highest.
Filter L: The number of notches read by the sensor when the rotation speed of the transfer belt is
at its possible lowest.
[A]
Ignored
[B]
Ignored
6-18
20 February 2004
[C]
G106D918.WMF
Filter H
Filter L
Time
G106D919.WMF