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G8MNY > TECH 14.08.05 22:26l 76 Lines 3437 Bytes #999 (0) @ WW
BID : 58015_GB7CIP
Read: GUEST OE7FMI
Subj: Xerox Copier Principles 1/2
Path: DB0FHN<DB0RGB<OK0PPL<DB0RES<ON0AR<7M3TJZ<HG8LXL<CX2SA<GB7CIP
Sent: 050814/1021Z @:GB7CIP.#32.GBR.EU #:58015 [Caterham] $:58015_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
By G8MNY (New Comments Dec 04)
After working on a few old copiers & laser printers, here is a brief overview
of how they do their magic.
TONER
This is the very fine black (or Cyan, Magenta & Yellow) powder "ink" that forms
the image. Each particle consists of a low melting point glue centre with a
dye (carbon) outside.
HAZARDS
Toner: This gets everywhere, so when working with it have a vacuum cleaner &
soft brush handy to such up spills, never blow it clean! Wear a mask if no
vacuum cleaner handy.
Voltages: Very high voltage is used in this process, so never override safety
interlocks etc. they are there for your safety!
Weight: The larger machines can be very heavy, so use help to move, & watch out
for heavy top decks when propped open!
OPTICS
This is cleaver, all done with 6 mirrors. They convey the image from (1) a
moving light (300W) scanning mirror, that moves over the entire image, to a
half moving pair (2 & 3) of mirrors that maintain a constant distance from the
original image to the lens. The lens position & the next pair of mirrors (4&5)
form the Zoom feature of most copiers as well as keeping the final image
focused. The last mirror (6) is fixed & presents the image to top of the drum.
For cleaning note all the mirrors are surface silvered & are easily damaged,
only use the lightest of cleaning pressure!
When double side printing it is worth noting as there is a lens involved & the
scanning is from underneath th original & printing is on top of the paper, the
image is always reversed. eg. top is bottom, but the starting edge is the start
edge. This my not be the same with digital copiers!
The optics are normally maintained clear of misting when the copier is
apparently powered off by a permanent heater (30W).
O r i g i n a l I m a g e
..............................................Glass Plate
2 / , ³
/' <--- /' \.@) Scanning Movable
`\ Mirror & lamp /\ Lens \ 4 Zoom &
3`\ ---------------------> ³ ³ -----> `\ Focus
Half Fixed \/ `\Mirrors
Travelling Mirror /'
Mirrors Charge 6/ <-------- /'5
Corona Wire /'| /'
Small a_ b[.] \|/c
Lights ³@_..---.._ d
Scraper ./ DRUM -> \. New
Fuser / \ ³ With ³ Toner
Unit _.._ Waste\_/g³ Light ³e _ _³Hopper
./Hot \. Toner ³ Sensitive ³ \__/
³ Roll ³ Hopper `\_Coating_/'
_ _ _ _\_._./_ _ _ _ _ _ _ _ _`_-_-_'_ _ _ _ _ /___ Paper path
./' `\. Flat feed [.]f \ (from paper draw)
Metal ³ Lamp ³ Tractor Transfuse
Roller`\_ _/' (charger)
`' (wires)
THE DRUM
This is an aluminium tube with a fairly long wearing photo sensitive Selenium
coating. It is a very good insulator & can store strong static charges but
when light falls on it, it quickly leaks away the charge. (if drum is removed
avoid scratching & finger prints etc, & don't leave drum exposed to bright
light [sun]).
In part 2.. Drum Process, Paper Handling, Fuser Unit, & Laser Printers.
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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