Wrinkle Prevention - Ricoh Aficio 480W Dolphin-C2 Service Manual

28 April 2005 FUSING UNIT

6.10.8 WRINKLE PREVENTION

[A]
[B]
[C]
B188D955.WMFF
The speed of the paper at the fusing rollers [A] is slightly faster than at the
registration rollers [B] to ensure that the correct amount of tension is maintained on
the paper [C] between the registration and fusing rollers. This prevents wrinkling in
the fusing unit.
However, after the paper leading edge is grabbed by the fusing unit, the paper
moves past the drum faster than previously, which could enlarge the image slightly
in the sub scan direction. To prevent this, both the registration and fusing motors
slow down slightly (by the same amount) when the leading edge of the paper
reaches the exit sensor.
The distance between the registration roller and exit sensor is about 360 mm
(14.2"), so this motor speed correction is only used when paper is longer than 360
mm.
6-55