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Before photocopiers were invented, usually to duplicate a document was to use carbon paper (the famous tracing paper or tracing) that until, in 1903, the American GC Beidler found a way to make a quick playback document a negative instant development photographic technique patented in 1906. This rapid development led to the first copy, more like a photograph than the current copy we know today or you can check on this site: www.copierrepairbaltimore.com.
How does a photocopier?
The photocopier is a device that instantly provides copies of any document. Two main types of copiers: the xerographic, using regular paper, and the electrostatic sensitive requiring special paper.
Xerographic
Xerographic copiers In the original document is scanned by a beam of intense light that projects the image on a photosensitive surface rotating drum, which is electrostatically charged in correspondence with the image.
On the drum is distributed pigmented powder, called toner , which adheres to electrified areas (ie, where no image), 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.
Although it was invented by the Greeks, this process reminds us that civilization, to which we owe its name.
Xerography (xeros Greek: graphein dry: write) was invented by another American, Chester Carlson, the October 22, 1938, but that the called electrophotography. In the following years, a score of institutions rejected his patent, until, in 1944, the Battelle Memorial Institute of Ohio signed an agreement with Carlson and began to develop xerography. In 1947 signed an agreement with a small photography business, Haloid, which later became the now famous Xerox.
In 1959 he sold the first photocopier: Xerox 914.
Electrostatic
In electrostatic copiers 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.
Color
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 at www.copierrepairbaltimore.com.
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