Canon DADF-P1, Руководство по обслуживанию

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Chapter 2
2-4
2.3 Document Detection
2.3.1 Outline
0010-3898
This machine detects an document using either one of the two methods depending on the print mode.
- Normal print mode (other than mixed size print mode and banner paper mode)
- Mixed size print mode and banner paper mode
a. Normal print mode (other than mixed size print mode and banner paper mode)
In the normal print mode, the following four document detection functions are used:
T-2-3
b. Mixed size print mode and banner paper mode
In the mixed size print mode and banner paper mode, the following three document detection functions are used:
T-2-4
2.3.2 Document Presence/Absence Detection
0010-3899
The Document set sensor (PI11) detects presence/absence of a document on the document tray.
When a document is placed on the document tray, the detection lever moves the light shielding plate to allow light to pass thorough the photo interrupter. Thus, the
Document set sensor (PI11) generates an document detection signal (EMPTY) to notify the host machine that an document is placed on the document tray via the
ADF drive PCB.
F-2-6
2.3.3 Detection of Last Document
0010-3900
The last document detection sensor (PI3) and Document set sensor (PI11) detect whether the document being picked up is the last one.
When the trailing edge of the last document has moved past the last document detection lever, the detection lever moves the light shielding plate to allow light pass
through the photo interrupter. Thus, the last document detection sensor (PI3) generates a last document detection signal (LAST). When the last document has moved
past the document sensor (PI11), an document absence signal (EMPTY) is generated to notify the host machine that an document being picked up is the last one
via the ADF drive PCB.
Function Description Sensor used (symbol)
Document presence/
absence detection Detects whether there is an document on the
document pickup tray. Document set sensor (PI11)
Last document detection Detects whether the document being picked up is
the last one. Last document detection sensor
(PI3)
Initial document size
detection
- Longitudinal direction
Detects the length of the document placed on the
document pickup tray. Document length sensor 1/2 (PI4/
PI5)
- Lateral direction Detects the width of the document placed on the
document pickup tray. Document width sensor 1/2 (PI2/
PI1)
Function Description Sensor used (symbol)
Document presence/
absence detection Detects whether there is a document
on the document pickup tray. Document set sensor (PI11)
Last document detection Detects whether the document being
picked up is the last one. Last document detection sensor (PI3)
Document length detection Detects the document length
according to the distance from the
position where the read sensor (PI7)
turns on to the position where the read
sensor (I7) turns off.
Read sensor (PI7)
ADF driver PCB
Document Detection lever
PI11
EMPTY