Sharp FO-165, Service Manual

Page: 37 / 112

CHAPTER 3. MECHANISM BLOCKS
[1] General description
1. Document feed block and diagram
Fig. 1
2. Document feed operation
1) The document placed in the hopper actuates the document sen-
sor. After one second, the pulse motor starts to drive the paper
feed roller. The document is automatically taken up into the ma-
chine, and stopped at the document sensor.
2) When a specified number of pulses are received from the docu-
ment sensor after the document lead edge is sensed, scanning is
started.
3) When a specified number of pulses are received from the docu-
ment sensor after the document rear edge is sensed, scanning is
terminated and the document is fed through.
4) If the document sensor is active (i.e., another document is in the
hopper), when the preceding document scanning is completed
and it is fed out, the next document is taken up into the machine.
If the document sensor is not active (i.e., there is no document in
the hopper), when the document is fed out, the operation is termi-
nated.
3. Hopper mechanism
3-1. General view
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
Fig. 3
3-3. Documents applicable for automatic feed
4x6 series
(788mm x 1091mm x
1000mm sheets) Square
meter series
Minimum Maximum Minimum Maximum
Feeder capacity 20 sheets, max.
Paper weight 45kg 64.3kg 52g/m
2
74.3g/m
2
Paper thickness (ref.) 0.06mm 0.09mm 0.06mm 0.09mm
Paper size B6 (128mm x 182mm)
∼
A4 (210mm x 297mm), Letter (216mm x 279mm)
Feeder capacity 10 sheets, max.
Paper weight 45kg 90kg 52g/m
2
104g/m
2
Paper thickness (ref.) 0.06mm 0.12mm 0.06mm 0.12mm
Paper size B6 (128mm x 182mm)
∼
A4 (210mm x 297mm), Letter (216mm x 279mm)
Paper quality High quality paper or equivalent
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
(74.3g/m
2
) and lighter than 135kg (157g/m
2
) are acceptable for man-
ual 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, curls, 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 straighten
out.
2) Do not load the documents of different sizes and/or
thicknesses together.
Paper feed spring
Separation
rubber plate
Pinch roller(1)
Transfer roller
Pinch roller(2)
Paper feed roller
Document
Separation rubber plate Paper feed spring
Paper feed roller
UX-177H
3 – 1