Document Detection; Overview - Canon DADF-M1 Service Manual

2.3 Document Detection

2.3.1 Overview

The machine possesses the following 2 modes of operation to suit different printing modes:
a. normal mode (other than mix of different configurations or extra-length)
Item Description
Presence/ checks the presence/absence of an original in the
absence of original pickup tray.
original
Original size identification
Feed monitors the state of the post-separation sensor (on/
direction off) after the read sensor goes on to identify the
original as being small or large.
checks the length of the original placed in the
original pickup tray; identification of LTR and LGL.
Cross-feed checks the width of the original placed in the original
direction pickup tray.
identification between A4R/A5R and LTRR/
STMTR
b. Mix of Different Configurations/Extra-Length
If the originals are of different configurations or are of extra length, the following 3
detection mechanisms are used:
T-2-3
Chapter 2
0002-7374
Sensor used
(notation)
original
placement
sensor
post-separation
sensor, read
sensor
LGL sensor
original width
volume (VR1)
AB/inch sensor
2-21