Canon imageFORMULA P-215 Service Manual page 32

CHAPTER 2 FUNCTION & OPERATION
1) Feed path
The feed path of this machine is a straight
path that tilts from the pickup tray to the
registration roller and is horizontal to the
front roller including the reading section.
The pickup roller is not mounted.
The leading edge of the loaded document
touches the feed roller and the separation
pad. Once the machine starts scanning, it
activates the rollers to feed the document
inside. The document passes through the
registration roller, the reading units, and
the front roller and is ejected to the outside
of the machine. This machine does not
have an eject tray.
2) Drive
The feed motor drives the feed roller and
each drive roller. The rotational speed of
the feed motor is determined by scan
conditions.
To provide space between the leading
edge of a document and the trailing edge
of the next document, the drive speed of
the feed roller is slightly lower than the
drive speed of the registration roller and
front roller. If it is left as it is, the document
is braked when it touches the feed roller
and the registration roller, and therefore, a
one-way clutch is built into the gear used
in the feed roller drive system to follow the
drive speed of the registration roller.
3) Separation
Separation of the documents is performed
by the separation pad. Double feeds and
pickup errors are prevented by optimizing
the shape of the separation pad and fric-
tion against documents.
However, if the document setting method
is incorrect, the contact between the
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4) Sensor
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document and the separation pad be-
comes poor and double feeds or pickup
errors tend to occur easily. For details on
the document setting method, refer to the
"User Manual" or "CHAPTER 1 GENERAL
DESCRIPTION, III. USER OPERATION".
For document detection, the document
sensor is mounted on the document set-
ting section and the registration sensor is
mounted on the registration roller section.
They are used for feed control and feed
error detection
CANON P-215 FIRST EDITION