Chapter 3. Mechanism Blocks; General Description - Sharp FO-145 Service Manual

CHAPTER 3. MECHANISM BLOCKS
[1]
General description
1.
Document feed block and diagram
2.
1)
2)
3)
4)
3.
Document
Separation rubber plate
roller (2)
Paper feed roller
Feed roller (1)
Pinch roller (2)
Fig. 1
Document feed operation
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.
When a specified number of pulses are received from the docu-
ment sensor after the document lead edge is sensed, scanning is
started.
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.
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.
t-lopper mechanism
3-1. General view
Fig. 2
The hopper is used to align documents with the document guides
adjusted to the paper width.
FO-145A
3-2. Automatic document feed
1)
2)
—
Use of the paper feed roiler and separation rubber pla[e ensbres
error-free transport and separation of documents. The plate sprlns
presses the document to the paper feed roller to assure smoc~h
feeding of the document.
Document separation method: Separation rubber
plate
Separation rubber plate
Paper
feed spr~ng
+.–._.flfl
Paper feed roller/ '
Fig. 3
3-3. Documents applicable for automatic feed
.
4x6series
, Square
(788mmx 1091mmx ~meterseries
[ looomm sheets)
I
~-Minimum I Maximum ' Minimum Max~m. m
,
Feeder c apacity
\ 18 sheets,max.
Paoerweiaht 45kq I 64.3kg ~ 52g/m2 I 7~.3gImJ
,
Pa~er thickness(ref.) I 0.06mm I 0.09mm ~ 0.06rnrn
I
0,39m-
Papersize B6 (128mmx 182mm)-
A4 (21Ommx 297mm),Letter(216mm
x 279mm I ,
Feeder capacity
10 sheets, max.
Paper weight
45kg ; 90kg ! 52g/mz 104g~~lQ ~
PaDer t hickness
(ref.) ]
0.06mm ' 0.12mm ~ 0.06mm 0.12m~ ~
Papersize
B6(128mmx 182mm)-
A4 (21Ommx 297mm),Letter(216mmx 279~m:
Paperquality Highqualitypaperor 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 64.3k~
(74.3g/m2) and lighter than 135kg (157g/m2) are acceptable for rrian-
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)
2)
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.
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 in~o
the hopper. The first page under the stack will be taken ~p oy
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/Gr
thicknesses together.
NOTE: Adjust the document
guides
before and after inserting the
document.
3–1