Canon DADF-AA1 - Initial Document Size Detection

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Chapter 3

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3.3.4 Initial Document Size Detection

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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.

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The following table shows the relationship among length detection sensor signals, document widths, and initial document sizes.

1. AB type

T-3-1

2. Inch type

T-3-2

Sensor name

Document width

sensor 1(PS2)

Document width

sensor 2(PS1)

Document length