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How photocopier works. R.B.Chavan Department of Textile Technology Indian Institute of Technology Hauz-Khas, New Delhi 110016. Basic steps. Open the copier lid Place the document to be photocopied face-down on the glass

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how photocopier works

How photocopier works

R.B.Chavan

Department of Textile Technology

Indian Institute of Technology

Hauz-Khas, New Delhi 110016

basic steps
Basic steps
  • Open the copier lid
  • Place the document to be photocopied face-down on the glass
  • Select the options you want (number of pages, enlargements, lighter/darker)
  • Press the Start button
what happens
What happens
  • Basic principle
  • Electrostatic attraction
  • Main component Light sensitive photoconductive drum made coated with selemnium or photoconductive polymer.
  • The surface of the drum is charged.
  • An intense beam of light moves across the paper that you have placed on the copier's glass surface. Light is reflected from white areas of the paper and strikes the drum below.
  • Wherever of light hits, electrons are emitted from the photoconductive atoms in the drum and neutralize the positive charges above. Dark areas on the original (such as pictures or text) do not reflect light onto the drum, leaving regions of positive charges on the drum's surface.
toner attraction
Toner attraction
  • Toner
  • It is a mixture of colour pigment and thermoplastic polymer
  • The toner is -vely charged
  • -ve charged toner gets attracted to +ve charge image on photoconductive drum
  • Paper is charged +ve
  • -ve charge toner in the form of image is attracted to +ve charge paper
  • The paer then heated during which thermoplastic binder softens and help to adhere the pigment colour on the paper
slide5

Steps

Step 1Step 2

slide12

3. Charge platen with corona wire

charge leaks off wire because of corona discharge,

with associated "ozone smell" in some cases

slide13

4. Expose platen to image

illuminated part of platen allows charge to

leak away because of photoconduction

slide16

7. Expose platen to toner

toner is carried electrostatically by carrier particle

released onto the relatively stronger charge of the platen

slide24

14. Toner fused to paper

  • -- accomplished by heated rollers and a bit of pressure,
  • hence the warm, sometimes "curled", paper
  • 2. Cleaning and back to Step 1.