Brother International IntelliFax-3550 Service Manual - Page 22

Scanner Mechanism, advances with the document feed roller ASSY to the scanner

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2.1 Scanner Mechanism Document ADF parts Nip-related parts Document stacker Document feed roller ASSY Document pressure bar Document ejection roller ASSY Document feeding and ejecting mechanism Document scanning mechanism 2nd mirror Document front sensor actuator Document take-in roller ASSY Separation roller ASSY Document rear sensor actuator CCD unit Lens 1st mirror LED array Document tray (Front) 2.1.1 Document feeding and ejecting mechanism This mechanism consists of the document stacker, automatic document feeder (ADF), document feed roller ASSY, and document sensors. (For details about the sensors, refer to Section 2.3.) If the operator sets documents on the document stacker and starts the scanning operation, the scanner motor rotates so that the ADF (which consists of the document take-in roller ASSY, separation roller ASSY, ADF parts and nip-related parts) feeds those documents into the equipment, starting from the bottom sheet to the top, page by page. Each document advances with the document feed roller ASSY to the scanner, and then it is fed out of the equipment with the document ejection roller ASSY. 2.1.2 Document scanning mechanism The scanner uses a charge coupled device (CCD) image sensor. As illustrated above, the LED array illuminates a document and the reflected light of the scanned image data is transmitted via the mirrors into the lens which reduces the scanned data so as to form the image on the CCD. III - 3

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III –
3
2.1
Scanner Mechanism
Document stacker
Document feed roller ASSY
Document pressure bar
Document take-in roller ASSY
2nd mirror
Separation roller ASSY
LED array
1st mirror
Document tray
(Front)
Document scanning
mechanism
Document feeding and
ejecting mechanism
Document ejection roller ASSY
Document
ADF parts
Document rear sensor actuator
2.1.1
Document feeding and ejecting mechanism
This mechanism consists of the document stacker, automatic document feeder (ADF), docu-
ment feed roller ASSY, and document sensors.
(For details about the sensors, refer to Sec-
tion 2.3.)
If the operator sets documents on the document stacker and starts the scanning operation,
the scanner motor rotates so that the ADF (which consists of the document take-in roller
ASSY, separation roller ASSY, ADF parts and nip-related parts) feeds those documents into
the equipment, starting from the bottom sheet to the top, page by page.
Each document
advances with the document feed roller ASSY to the scanner, and then it is fed out of the
equipment with the document ejection roller ASSY.
2.1.2
Document scanning mechanism
The scanner uses a charge coupled device (CCD) image sensor.
As illustrated above, the LED array illuminates a document and the reflected light of the
scanned image data is transmitted via the mirrors into the lens which reduces the scanned
data so as to form the image on the CCD.
Document front sensor actuator
Nip-related
parts
Lens
CCD unit