Ricoh LDD250, Service Manual

Page: 447 / 459

IMAGE UP/DOWN SHIFTING
SM 6-125 C262/C265
Detailed
Des
cription
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6.11.2 IMAGE UP/DOWN SHIFTING MECHANISM
This section explains how the machine changes the position of the pressure
cylinder to cope with the changed registration start timing in image shifting mode.
The image shift motor [F] turns by an amount that depends on the image shift
amount selected at the operation panel. The motor drives the image shift arm [D]
through the worm gear [E].
The image shift arm pivots about the shaft [H]. The image shift gear [C], attached
to the image shift arm, also rotates about the shaft as it moves around the surface
of the primary gear [A]. The image shift gear turns the primary gear as it moves
around its surface.
The primary gear is connected to the idler pulley [G] via a timing belt. The idler
pulley rotates the pressure cylinder drive gear (not shown). Therefore, moving the
image shift gear up or down rotates the pressure cylinder drive gear, which
changes the position of the pressure cylinder.
The drum drive gear [B] is also on the shaft [H]. However, it does not turn when the
primary gear turns. Therefore, the drum stays in the same position (the home
position) even though the position of the pressure cylinder changes.
In this way, a phase difference is made between the positions of the drum and
pressure cylinder.
C262D122.WMF
[A]
[B]
[C]
[D] [E]
[F]
[G]
[H]