Canon FAX L1000 Service Manual page 176

FAX-L1000 Chapter 3: Technical Reference
Document stopper movement
(1) When documents are set (Fig. A)
NOTE
(2) When the stopper goes up (Fig. B)
(3) When document feed begins (Fig. C, D)
(4) After the document feed ends (Fig. E)
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.
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.
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.
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.
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.
3-32