Canon FAX-L1000 - Manual (Page 176)

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FAX-L1000 Chapter 3: Technical Reference
NOTE
Document stopper movement
(1) When documents are set (Fig. A)
The document stopper on the ADF section (Upper reader frame) stops the
document which is inserted into the document insertion opening,
preventing it from being pushed in too far.
(2) When the stopper goes up (Fig. B)
The cam is rotated by the DC motor, and the document stopper moves into
a free condition. At this time, the pick-up roller moves down and the
document is fed.
(3) When document feed begins (Fig. C, D)
And the document feed sensor which deeds the document comes ON, the
pick-up roller moves up, and the document stopper maintains a free
condition.
(4) After the document feed ends (Fig. E)
If all of the documents are delivered, the cam is rotated by the DC motor,
the pick-up roller moves up and down, and the stopper returns to its
original condition.
Initializing the document stopper
The projection on the upper document feed roller needs to be set (initialized)
to the optimum position to operate the document stopper properly.
The fax machine performs initialization when the power is turned on, and
after a document is ejected. The initialize operation is described in (4) above.