43967002TH Rev.1
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Oki Data CONFIDENTIAL
2. Theory of Operation
2.3.1.4 Document detection
Document present/absent detection
Document present/absent detection on the document tray is performed by the document set
sensor (PI11). When a document is placed on the document tray, the detection lever moves
together with the light-shielding plate so that the photo interrupter that has been shutting
down the light, passes the light. Thus, the document set sensor (PI11) issues the document
detection signal (EMPTY) telling that a document is set, to the connected equipment via the
ADF driver circuit PCB.
Detection of final document
The final document detection sensor (PI3) and the document set sensor (PI11) detect if the
document that has started scanning is the final document or not. If the final document is
fed, and the rear end of the final document has passed the final document detection lever of
the document tray, the detection lever moves together with the light-shielding plate so that
the photo interrupter that has been shutting down the light, passes the light. Thus, the final
document detection sensor (PI3) issues the final document detection signal (LAST). When
the final document has passed the document sensor (PI11), the no document signal (EMPTY)
is issued telling that the document under feeding is the final document, to the connected
equipment via the ADF driver circuit PCB.
ADF driver circuit PCB
Document
Detection lever
PI11
EMPTY
ADF driver circuit PCB
Document
Detection
lever
LAST
EMPTY
PI11
PI3
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