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READING SECTION
2.2
Book Reading Method
Book reading is a method where the document (thick document) is placed
on the copyboard glass and is read by the contact sensor. This sensor is
moved backwards and forwards in the
guide shaft by motor drive transmitted to the belt via gears.
2.3
ADF Type
One of the sheet reading methods is the ADF (Auto Document Feeder)
separation method. There are two main ADF types, flat-bed type and drop-
in type.
2.3.1 Flat-bed type
A feature of this ADF type is consistent performance during loading of
documents, which makes it suitable for loading a document comprising
many sheets.
On the other hand, however, it costs more as a forwarding roller is required
in the mechanism and more installation space is required.
sometimes occurs due to over-insertion of document sheets when the docu-
ment is loaded, or, alternatively, sheets being
amount of sheets being loaded.
• Explanation of flat-bed type operation
By this type of ADF mechanism, drive from the document feed motor is
transmitted to the rollers required for document forwarding, separation,
feed, and eject via gears and belts.
To control ADF operation, the
the document feed motor, and two photointerrupter type sensors, document
sensor (DS) and document edge sensor (DES), installed on the actuator
arm detect the feed state of the document.
3–4
vertical scanning
Copyboard glass
Contact sensor
Fig. 3-4 Book Reading Method
CPU
counts the number of step pulses of
direction along the
Double feeding
non-fed
due to an insufficient
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