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2 Machine Composition
2.1 Document scanning section
2.1.1 Auto Document Feeder (ADF) Section
ADF (Auto Document Feeder) is a device that feeds the document continuously one page by one to the
scanning section automatically. It consists mainly of document tray, Tx cover, inner guide, and platen cover.
When the device is categorized by its functions, it consists of separator section that picks up each page of
documents, register section that detects the leading edge of the document and controls the timing so that the
document does not skew, and scan section that scans the document.
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No. Part name No. Part name
1 DS1 sensor 2 Pickup roller
3 Separate pad 4 Separate roller
5 DRS sensor 6 Resist roller
7 Press roller 8 Feed roller (Reverse roller)
9 DS2 sensor 10 Home sensor
11 CIS (Contact Image Sensor) 12 Feed roller
13 DS3 sensor 14 DEXIT sensor
15 Exit roller
Document insert section / separator section
The machine scans up to Letter paper size document width. Place the document to the center of the docu-
ment tray and align the document guide.
By pressing the start key through copy or transmission commands, the motor starts driving, and the driving
force is transferred to the pick up roller through gears, and the document will be fed.
Document separator section consists mainly of separate roller and separate pad.
The document will be fed from the upper pages. Remaining documents are separated by the friction of the
separate pad and only the top page will fed by the separate roller.
Register section
Following the document separation, the separate roller transfers the document to register section.
During this transfer, clutch 2 (CL2) which drives the register roller is turned off and the document leading
edge stops at the register roller. The separate roller feeds the document forward, and that prevents the docu-
ment to skew.
The document sensor (DRS) is placed between the separator section and the register roller to detect the
leading edge of the document.
When the document leading edge passes the sensor and the loop is made, clutch 1 (CL1) runs idle (turns
off) and clutch 2 runs (turns on) and the register roller transfers the document to the scan position
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