Operation - Canon Image Reader-A1 iR5000i Service Manual

CHAPTER 5 PICK-UP/FEEDING SYSTEM

4.4.2 Operation

The home position of the duplexing horizontal registration sensor is detected each time
the main power switch is turned on, jam recovery is made, or front cover is closed; and the
sensor moves to the start position (for A4) when the registration sensor turns on.
When paper moved to the duplexing feeding assembly reaches the duplexing paper sensor
(PS34), the horizontal registration motor (M16) turns on, and the duplexing horizontal reg-
istration sensor (PS31) starts detection of the edge of the paper; this is done during the 100-
msec period in which the duplexing feed right motor (M19) remains at rest, and each time a
double-sided print is made.
The start position for detection is set to about 10 mm from the edge of paper, determined
in reference to an ideal position of paper obtained based on the position of the slide guide of
the manual feed tray and the size of the cassette being used when the registration sensor
turns on.
The detection of paper is done with reference to the start position, and the discrepancy be-
tween the start position and the actual position of the paper is identified with reference to
the number of pulses (a signal pulse being about 0.16 mm) generated by the motor.
Duplexing feeding right
motor (M18)
Registration sensor
(PS29)
Duplexing paper
sensor (PS34)
Duplexing horizontal
registration motor (M16)
Duplexing horizontal
registration sensor (PS31)
Position of
horizontal
registration
sensor (PS31)
Edge of paper
*1: While the light-blocking plate is absent, the edge of paper and butting against the
sensor are detected.
*2: Different paper sizes result in different paper edge positions, thus different S.P.
H.P: Start position of the duplexing horizontal sensor.
S.P: Start position of detection by the duplexing registration sensor.
5-36 P
Main power switch ON
INTR/STBY
Reverse
H.P
S.P
*1
F05-404-02
COPYRIGHT © 2001 CANON INC.
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10 mm (approx.)
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100 msec (approx.)
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CANON iR5000i/iR6000i REV.0 JUNE 2001