7. Theory of Mechanism
7-1 Scanner Mechanism
The scanner mechanism consists of components which feed, scan, and eject the documents that are to be copied
or transmitted to a remote facsimile unit. These components and their functions are explained below.
7-1-1 Automatic Document Feeder7-1-2 Contact Image Sensor (CIS)
(ADF) Mechanism
The contact image sensor unit consist of LEDs, rod
lens array, and a photo sensor. The LEDs illuminate
The automatic document feeder, consisting of
various rollers, ADF rubber pad, and springs, the document to be scanned when the leading edge
automatically separates and feeds the pages of a doc-is detected by the document scan sensor. The LEDs
ument over the scanning area and stacks them on theturn off when the document exits the scanner
document exit tray.mechanism.
Documents up to 30 pages can be placed in the auto-The LEDs illuminate the document to obtain an
matic document feeder for scanning. The image from the document through the rod lens array,
leading edge of the document will move the where the image is translated into voltage
document detect sensor lever when the operatorlevels.
slides the stack into the ADF. The scan motor starts to
rotate when the document detect sensor has detected
the leading edge of the document. The ADF roller
feeds the first page of the document into the feeder.7-1-3 Document Sensors
The scan motor is stopped when the leading edge ofThere are two document sensors in the scanner
the page actuates the document scan sensor. Themechanism; the document detect and the document
page is now in the scan position. scan sensor. The document detect sensor, detects
whether or not a document is loaded, and the
The ADF rubber prevents multiple sheets from beingdocument scan sensor detects the scan position of the
feed. A spring provides forces that the pad places ondocument.
the document pages for proper separation.
The scan motor is turned on when the machine is
ready to scan the document and drives the feed roller
at a speed determined by the resolution
selected. The scan motor is stopped after a set
period of time when the trailing edge of the page
releases the document scan sensor. If another page is
detected as the tailing edge of the page releases the
document scan sensor, the next page will be fed to
the scan position. The exit roller pushes the page out
onto the document exit tray where it is stacked.
Samsung Electronics7-1 |
ACEC
