43967002TH Rev.1
48 /
Oki Data CONFIDENTIAL
2. Theory of Operation
Size detection of the initial document
Size detection of the initial document that is set on the document tray is performed as follows.
Size of the document in the transport direction is detected by the document length sensor 1
(PI4) and the document length detection sensor 2 (PI5). The transversal size is detected by
the document width sensor 1 (PI2) and the document width sensor 2 (PI1).
When a document is placed on the document tray, the detection levers of the two document
length sensors moves together with the light-shielding plate.
Then the light-shielding plate shuts down the light from the photo interrupter. When the slide
guide is adjusted in accordance with the document size, the incoming light into the two
document width sensors inside the document tray is interrupted by the light-shielding plate
that is installed in the lower part of the slide guide.
The document size is identified by the combination of the ON/OFF signal from the document
length sensors and the ON/OFF signal from the document width sensors.
Relationship between the respective length detection sensor signals, the document width and
the size detection of the initial document is shown below. 1.
1. AB system
Sensor name
Document width
sensor 1
Document width
sensor 2
Document length
sensor 1
Document length
sensor 2
Size
A3
ON
ON
ON
ON
B4
OFF
ON
ON
ON
A4R
OFF
OFF
ON
OFF
B5R
ON
OFF
ON
OFF
A4
ON
ON
OFF
OFF
A5R
ON
OFF
OFF
OFF
B5
OFF
ON
OFF
OFF
A5
OFF
OFF
OFF
OFF
2. Inch system
Sensor name
Document width
sensor 1
Document width
sensor 2
Document length
sensor 1
Document length
sensor 2
Size
11x17
-
ON
ON
ON
LGL
-
OFF
ON
ON
LTRR
-
OFF
ON
OFF
LTR
-
ON
OFF
OFF
STMT
-
OFF
OFF
OFF
PI5
PI4
PI1
PI2
