Document Scanning Sequence; Adf Detection - Muratec F-315 Field Engineering Manual

2.6 Document Scanning Sequence

2.6.1 ADF Detection

When a document is placed into the document feeder, Document Sensor 1 (DS1) is activated and you
will hear the short beep.
The document will be transferred when the start key is pressed.
Document separation is the process that allows a multi-page document to go through the scanner one
page at a time. The top document is separated from the remaining documents by the friction of the
separator roller.
Following the document separation, the feed roller causes the document to advance. As it advances,
the leading edge of the document activates the Document Sensor 2 (DS2) sensor. Once DS2 is
activated, the feed roller continues to rotate until the document reaches the scan position. The
machine uses the distance from DS2 to the scan position and the diameter of the feed roller to
determine the number of rotations necessary to feed the document to the scan position.
When the document reaches the scan position, the light from the scanner lamp strikes the face of the
document and is reflected into the lens through mirrors A, B, and C. In case the light intensity along
the length of the scanner lamp is not uniform, shading compensation is provided to ensure even
illumination.
As the reflected image passes through the lens, it is focused onto the charged coupled device (CCD).
The CCD then converts the dark and light areas of the image into electrical impulses, or image data.
When DS2 detects the trailing edge of the document, the image signal output is turned off. The
scanner continues to remain active for a few more seconds in case there is another document to
follow.
The scanned document is discharged through the document exit by the exit roller.
MFX-1950
Pickup roller
Separator roller
DS1 (Feeler)
Separator pad
Exit roller
Feed roller
DS2 (Feeler)
Press roller
Mirror B
Home sensor Mirror C Mirror A
CCD
Mirror A
Lens
Scanner unit
F-315
Pickup roller
Separator roller
DS1 (Feeler)
Separator pad
Exit roller
Feed roller
DS2 (Feeler)
Press roller
Mirror B
Home sensor Mirror C Mirror A
CCD
Mirror A
Lens
Scanner unit
2-8