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Chapter 3
3.3.4 Initial Document Size Detection
The document length sensor 1 (SR8) and document length sensor 2 (SR8) detect the longitudinal size of the document placed on the document tray, and the docu-
ment width sensor 1 (PS2) and the document width sensor 2 (PS1) detect the lateral size of the document.
When a document is placed on the document tray, detection levers of the two document length sensors move the light shielding plate to prevent light from passing
through the photo interrupter.
If the slide guide is adjusted to the document size, the two document width sensors mounted inside the document tray are shielded by the light shielding plate mount-
ed at the bottom of the slide guide.
Document sizes are determined by the combination of the ON/OFF states of document length sensors, the combination of ON/OFF states of document width sensor.
The following table shows the relationship among length detection sensor signals, document widths, and initial document sizes.
1. AB type
2. Inch type
Size
3-10
PS1
SR7
Document width
sensor 1(PS2)
A3
ON
B4
OFF
A4R
OFF
B5R
ON
Size
A4
ON
A5R
ON
B5
OFF
A5
OFF
B6
ON
Document width
sensor 1(PS2)
11 x 17
OFF
LGL
OFF
LTRR
OFF
LTR
OFF
STMT
OFF
SR8
SR9
F-3-11
T-3-1
Sensor name
Document width
Document length
sensor 2(PS1)
sensor 1(SR9)
ON
ON
ON
ON
OFF
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
T-3-2
Sensor name
Document width
Document length
sensor 2(PS1)
sensor 1(SR9)
ON
ON
OFF
ON
OFF
OFF
ON
OFF
OFF
OFF
PS2
Document length
sensor 2(SR8)
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
Document length
sensor 2(SR8)
ON
ON
ON
OFF
OFF
0024-6991
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