Oce 3121, Technical & Service Manual

Page: 533 / 908

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ed.1 16 Duplex 509
Side alignment
a) Outline
■
The copies carried from the refeed unit, require alignment of the leading
edge.
■
The detection of the sides of the copy is carried out by the sensor PS14, to-
gether with motor M9. The sensor and motor are located near to the vertical
transport roller.
■
The registration motor M9 moves the registration sensor PS14, to detect the
edge of the paper. The result is used to determine the position of the image.
b) Operations
The home position of the registration sensor PS14 is checked when the ma-
chine is switched ON, and the front cover is closed. The movement of the sen-
sor is started when the sheet is detected by PS8.
When the paper leaves the refeed unit, and enters the vertical transport, it is de-
tected by the sensor PS8. The registration motor moves the sensor PS14 until
it locates the edge of the paper. The side detection occurs for every sheet as it
leaves the refeed unit.
The position of the start of the detection differs for each sheet. Ideally it is a
point approximately 10 mm from the edge of the paper that is being transport-
ed. The start position is determined by the size dictated by the cassette, or the
side guide of the speciality tray.
M9
Copy paper
10mm(approx.)
Detection start position
Home position
PS14
PS 14
M9
Paper
10 mm (approx.)
Detection starts
Home position