Ricoh PRIPORT VT 2000 Series Service Manual page 148

28 February '91
8. IMAGE SHIFTING SECTION
8.1 OVERALL
The image on the printing paper can be shifted 20 millimeters either back-
wards or forward using the Image Shift keys on the operation panel.
The image position is adjusted by the image shifting motor which changes
the paper feed timing by turning the first paper feed and second feed cams.
8.2 IMAGE SHIFTING MECHANISM
[K]
[N]
[O]
[P]
When the forward key (+key) is pressed, the image shifting motor [A] turns
clockwise (in the direction of the arrow) and drives cam gear [J] clockwise
through gears [B], [C], [D], [E], [F], [G] and [H] as illustrated on the next
page.
The cam gear [J] has a spiral track which the lever [K] moves along. When
the cam gear turns clockwise, the pin of the lever [K] moves towards the
outside of the cam gear [J]. Therefore, the lever [K] moves clockwise.
The lever [K] drives the gear [O] clockwise through the gear [N] and the first
paper feed and second feed cams mounted on the shaft of the gear [P] turn
clockwise. As a result, the paper feed start timing is delayed compared with
drum rotation timing and the image position is moved in the forward direc-
tion.
When the cam gear [J] turns, the gear [I] located behind the gear [J] turns
and the encoder [M] mounted on the gear [L] turns to check the image shift-
ing position.
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