Chapter 3. Mechanism Blocks; [L] General Description - Sharp FO-3700 Service Manual

1. Document feed block and diagram
Feed roller hold .y
2. Document feed operation
1) The document placed in the hopper actuates the front sensor.
After one second, the pulse motor starts to drive the paper feed
roller. The document is automatically taken up into the machine,
and stopped at the original sensor.
2) After a specified number of pulses are received from the docu-
ment lead edge being sensed, scanning is started.
3) When a specified number of pulses are received from the docu-
ment rear edge being sensed, scanning is terminated and the
document is fed through.
4) If the front sensor is active (i.e., another document is in the hop-
per), when the preceding document scanning is completed and
and it is fed out, the next document is taken up into the machine.
If the front sensor is not active (i.e., there is no document in the
hopper), when the document is fed out, the operation is ter-
minated.
3. Hopper mechanism
3-1. General view
Fig. 1
Fig. 2
The hopper is used to align documents with the document guides
adjusted to the paper width.
NOTE: Adjust the document guides before and after inserting the
document.
3-2. Automatic document feed
1) Use of the paper feed roller and separation rubber plate ensures
error-free transport and separation of documents. The plate spring
presses the document to the paper feed roller to assure smooth
feeding of the document.
2) Document separation method: Separation rubber plate
Separation rubber plate Paper feed
Paper feed spring
Paper feed roller
3-3. Documents applicable for automatic feed
Paper weight 45kg
Paper thickness (ref.)
B6 (128mm x 182mm) -
Paper size
A4 (210mm x 297mm). Letter (216mm x 279mm)
Paper weight 45kg
Paper thickness (ref.)
Paper size B6 (128mm x 182mm) -
A4 (210mm x 297mm). Letter (216mm x 279mm)
NOTE: Double-side coated documents and documents on facsimile
recording paper should be inserted manually. The document
feed quantity may be changed according to the document
thickness.
Documents corresponding to a paper weight heavier than 64.3kg
manual feed.
Documents heavier than 135kg in terms of the paper weight must be
duplicated on a copier to make it operative in the facsimile.
3-4. Loading the documents
1) Make sure that the documents are of suitable size and thickness,
and free from creases, folds, curis, wet glue, wet ink, clips, staples
and pins.
2) Place documents face down in the hopper.
i) Adjust the document guides to the document size.
ii) Align the top edge of documents and gently place them into
the hopper. The first page under the stack will be taken up by
the feed roller to get ready for transmission.
NOTES: 1) Curled edge of documents, if any, must be straightened
out.
2) Do not load the documents of different sizes and/or
thicknesses together.
Fig. 3
spring
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