Chapter 3. Mechanical Description; Mechanical Description - Sharp FACSIMILE FO-4500 Service Manual

FO-4500H

CHAPTER 3. MECHANICAL DESCRIPTION

[1] Mechanical description

1. Facsimile block
1-1. Document feed block and diagram
Transfer roller (2)
Document
LED
2. Document feed operation
1) As shown in Fig.1, the document set in the hopper (the front
sensor is on) is fed with the pay-out roller and paper feed roller
which rotate together with the pulse motor.
2) When a specified number of pulses are received from the docu-
ment sensor after the document lead edge is sensed, scanning
will be started.
3) When a specified number of pulses are received from the docu-
ment sensor after the document rear edge is sensed, scanning
will be ended to discharge the document to the tray.
4) If the front sensor is on (the document is set up in the hopper), the
next document is supplied and fed nearly when the last document
is completely read and discharged. If the front sensor is off (no
document is set up in the hopper), the drive will be stopped when
the document is discharged to the tray.
3. Hopper mechanism
3-1. General view
Hopper guide
Separation rubber plate
Front sensor
Original sensor
Transfer plate
Transfer roller
Paper feed roller
Transfer roller (1)
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) The structure with secure paper feed of the transfer roller and
secure separation of the separation rubber plate system is em-
ployed. The transfer roller is so semicircular as to be rotated only
when the paper feed roller is driven with the 2-step paper feed
clutch mechanism.
Moreover, the separation securely done by running the paper feed
and transfer rollers more slowly than the feed rollor.
2) Document separation system:
Friction + speed reduction rario + roller backlash separation system
Document
3-3. Documents applicable for automatic feed
Weight Metric system
indication indication
Thickness Metric system
indication indication
Document Document size
size Range
Number of Document size
ADF sheets Weight
Paper Kind
quality
NOTE: Double-side coated documents and documents on facsimile
recording paper should be inserted manually.
Documents corresponding to a paper weight heavier than 90kg and
lighter than 135kg are acceptable for 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 – 1
Separation rubber plate
Last page of document
Transfer plate
Document
First page of document
Transfer roller
Paper feed roller
Fig. 3
Product specifications
Indication Lower Limit
2
52g/m
0.06mm
(148mm × 128mm) ~
W letter (279.4mm × 432mm)
A4 (210mm × 297mm)
Letter (216mm × 279mm)
B6 ~ Letter/A4 size
B4 size/Legal
W letter size
90 kg or more
135 kg or less
Paper of fine quality/bond paper/Kent
paper
Upper Limit
2
80g/m
0.1mm
50 sheets
20 sheets
1 sheet
1 sheet