A BRIEF HISTORY OF THE COPIER
Before photocopiers were invented, usually to duplicate a document was to use carbon paper (tracing paper or tracing), but in 1903, the American GC Beidler found a way to make quick playback instantly developed a document of a photographic negative, a technique patented in 1906. This rapid development led to the first copy, more like a photograph than the current copy we know today – Click HERE.
BUT ….. HOW DO THEY WORK?
For starters there are 2 types of copiers:
1 – xerographic (use plain paper)
Process:
the original document is scanned by a beam of intense light that projects the image onto a rotating drum photosensitive surface (this is electrostatically charged in correspondence with the image).
On the drum is distributed pigmented powder (toner) which adheres to electrified areas (where no picture), writing or playing the original drawing.
The well pigmented image is transferred from the drum to the copy paper provisions, which eventually warms to fix definitively the pigment on the copy.
FACTS
The name xerography (xeros Greek: graphein dry: write) is owed to the Greeks but was not invented by these
For many years the patent was rejected these teneindo so until 1959 that marketed the first photocopier: the Xerox 914 being the company with the same name that was announced to the market.
2. Electrostatic (use a special sensitive paper)
Process:
Reproduced image is projected directly onto the paper, the surface is sensitized with electrical charges.
The paper is then subjected to a bath of toner particles and are fixed at electrified areas thereof leading to the final copy.
FACTS
The next step was the color photocopy, process created by the Japanese company Cannon in 1973.
The same company achieves laser copier black and white and later, in 1986, introduced the first color laser copier on plain paper –Click HERE.
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