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READING SECTION
(2) Document separation operation
After document forwarding, the document is fed out into the document
feed section one sheet at a time from the bottommost sheet by the separa-
tion roller and separation guide.
Entry of the remaining document sheets into the document feed section is
prevented by the separation guide.
The relationship shown by the following equation is used for separated
document sheets.
If the
taken to be µ1, the friction coefficient between the separation guide and the
document to be µ2, and the friction coefficient between two sheets of the
same document to be µ3, then the following relationship between these
three friction coefficients must be satisfied:
µ1 > µ2 > µ3
(3) Document feed operation
After the document is separated, the document sheets are fed to the contact
sensor by the feed roller. When the leading edge of the document pushes
up the actuator of the document edge sensor located at the feed roller sec-
tion, monitoring of the
To prevent slack in document feed, the document feed roller is driven at a
speed faster than that of the document separation roller. In this state, how-
ever, the document is pulled out from the separation roller. As a result, the
spring clutch inside the separation roller pulls back both the separation
roller and forwarding roller simultaneously to equalize the feed speed of
the rollers in the entire document feed section.
3–6
friction coefficient
between the document and separation roller is
Document pressure
plate
3
Forwarding roller
Fig. 3-7 Document Separation
document length
Document sensor
actuator
Separation guide
Separation roller
begins.
2
1
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