SHARP FACSMILE UX-370H/310H/FO-730H - MECHANISM BLOCKS - DESCRIPTION
Document feed block
Document feed operation
- The original, which is set in the document hopper, feeds automatically when the front sensor is activated. This in turn activates the pulse motor which drives the document supply roller. The document stops when the lead edge is detected by the document sensor.
- The lead edge of the original is fed a specified number of pulses after the lead edge of the document is detected for the reading process to begin.
- The trailing edge of the original is fed a specific number of pulses after the trailing edge of the document deactivates the document sensor. The read process then stops and the original is discharged.
- When the front sensor is in the OFF state (any document is not set up in the hopper guide), the drive will be stopped when the document is discharged.
Hopper mechanism
The hopper section contains document guides that are used to
adjust the hopper to the width of the original document. This ensures that the
original feeds straight into the fax machine for scanning.
Document width: 148 mm to 216 mm (A5 longitudinal size to
Letter longitudinal size)
NOTE: Adjust the document guide after setting up the
document.
Automatic document feed
- 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.
- Document separation method: Separation rubber plate.
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/m2) and lighter than 135kg (157g/m2 ) 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.
Loading the documents
- 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.
- Adjust the document guides to the document size.
- 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:
Curled edge of documents, if any, must be straighten out.
Do not load the documents of different sizes and/or thickness
together.
- Documents requiring use of document carrier
- Documents smaller than B6 (128mm x 182mm).
- Documents thinner than the thickness of 0.06mm.
- Documents containing creases, folds, or curls, especially those whose surface is curled (maximum allowable curl is 5mm).
- Documents containing tears.
- Carbon-backed documents. (Insert a white sheet of paper between the carbon back and the document carrier to avoid transfer of carbon to the carrier.)
- Documents containing an easily separable writing material (e.g., those written with a lead pencil).
- Transparent documents.
- Folded or glued documents. Document in document carrier should be inserted manually into the feeder.
Recording block
Driving
In the drive mechanism, the rotating force of the pulse
motor for both transmission and reception is transmitted to the paper supply
roller, the recording paper feed roller and imaging film drive gear
through the pulse motor axle gear, reduction gear and planetary gear.
Recording
This equipment employs the thermal transcription system,
which used the thermal head imaging film.
Thermal head: The
thermal head is composed of 2,016 heating elements in traverse line, and the
resolution power is 8 dots/mm. The maximum speed is 10ms/line.
Structure of recording mechanism
Recording is achieved by applying a suitable pressure to the
thermal head through the imaging film of the recording paper feed roller and
the recording paper. The main scanning is electronically done,
and the sub-scanning is mechanically done (by sending the recording paper with
the recording paper feed roller).
Recording paper transfer sequence
The recording paper stored in the RP hopper is fed with the
PU roller, and the recording paper is stopped when the P-IN sensor is turned on by sensing its lead edge.
Hereafter, the imaging film and recording paper are
transferred with the recording paper feed roller, and thermal transcription is
done on the recording paper.
After thermal transcription, the imaging film is taken up by
the roller on the take-up side, and the recording paper is discharged by the PO roller. As basic,
the density unevenness mainly results from the longitudinal misalignment of the
thermal head to the heater line. Otherwise, the head is in uneven contact with the recording paper feed
roller, or the imaging film is wrinkled.
The following items are described as the simplified checking
method.
- Is the power and signal cables of the thermal head suitably treated?
- Does the same symptom appear even if the thermal head pres-sure spring is replaced?
- Is the feed roller of the recording paper concentric? (Density is uneven at intervals.)
- Does the same symptom appear even if the thermal head is replaced?
- Is the imaging film stained or wrinkled?
