Ricoh Gestetner 5450, Service Manual, Page: 112 / 315

IMAGE UP/DOWN SHIFTING 1 July, 1998
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2.9 IMAGE UP/DOWN SHIFTING
2.9.1 OVERVIEW
In Image Up/Down Shifting mode, which can be operated at the operation panel,
the image position on the print can be moved forward or backward with respect to
the paper feed direction.
The image shift amount is controlled by changing the registration motor start
timing. However, when the paper feed timing from the registration roller changes,
the pressure cylinder position must also be changed so that the paper will be
caught properly by the paper clamper on the pressure cylinder. This is also
necessary to make sure that the printing pressure application area is correct, since
the pressure cylinder cross-section is not completely circular.
The image up/down shifting mechanism changes the position of the pressure
cylinder to match the amount of shift selected.
The mechanism is located in the drum drive gear [A]. It is composed of the image
shift gear [B], image shift motor [E], image shift HP sensor [D], and image shift arm
[C]. The HP sensor is activated when the image shifting arm is at home position.
C229D036.WMF
[A]
[B]
[C]
[D]
[E]