Epson GT-1200, Руководство по обслуживанию

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ADF Operating Principles
Rev. A
2-2
SINGLE FEEDING
In single feeding mode, the ADF loads document from the paper feed tray
and transports it to the scanning position, then ejects it immediately after
scanning. Therefore, document must be always transported in single
direction to let the ADF repeat feeding/ejecting operation cycle.
Setting document
1.
Document is set in the paper feed tray.
Pre-feeding
"Pre-feeding" means the sequence in which the ADF transports document
from the paper feed tray to the scanning position according to the single
feed command sent from the scanner.
2. When the wait shutter solenoid turns on, the document is picked up
and transported from the paper feed tray by the forward rotation of
the paper feed motor. The motor then stops rotating when the
registration sensor comes on. This sequence, from picking up the
document to the registration sensor's coming on, is called registration
operation. The transportation motor and the paper eject/reverse
motor also rotate forward to perform dummy ejection to prevent a
remaining document from jamming when the ADF is feeding another
document. This is performed for every feeding motion no matter a
document is remaining in the ADF or not.
3. After the registration operation is carried out, the paper feed motor
starts rotating forward to transport the document. The document is
transported to the position where the timing sensor comes on, which
means the end of the pre-feeding operation. Ongoing dummy ejection
is carried out.
4. The transportation motor and paper feeding motor rotate forward and
backward, respectively, to transport the document onto the platen
glass. Then the document size is measured when the registration
sensor goes off and the paper feed motor stops rotating when the
timing sensor goes off.
Figure 2-2. Document Set Condition (Step 1)
Figure 2-3. Pre-feeding (Step 2)
Figure 2-4. Pre-feeding (Step 3)
Figure 2-5. Single Feeding (Step 4)