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November 29, 1999
2. DETAILED SECTION DESCRIPTIONS
2.1 ADF/SCANNER
2.1.1 OVERVIEW
[C]
1. Document detection
• The machine detects when a document is placed in the ADF by monitoring
the document sensor (S1).
• From the combined output of the document (S1), B4 width, and A3 width
sensors, the ADF can detect three possible widths: A4, B4, and A3.
2. Document pick-up
• The vertical movement of the pick-up roller [A] is controlled by a spring
clutch.
• FRR type separation mechanism, using the reverse roller [B].
• The pick-up roller gear prevents excessive load from being placed on the
scanner motor.
• The spring clutch of the feed roller prevents excessive load from being
placed on the scanner motor.
3. Document feed
• The scanner motor drives all the document feed rollers.
• MDF [C] (Manual Document Feeder)
4. Returning to ready status
• The pick-up roller is lifted by reverse rotation of the scanner motor.
5. Image Scanning (CCD)
• Maximum scanning width: A3
• Stamp function
6. Jam detection
• Monitoring of all sensors
[A]
[B]
H306D516.WMF
2-1
ADF/SCANNER
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