Office Photocopier


Office photocopiers are machines that have the capacity to create multiple paper copies of your required documents and visual images cheaply and quickly. Most office photocopiers use xerography. Xerography is a dry process that uses heat. Some office photocopiers also use other technologies such as digital, ink get, laser etc but xerography is a standard technology that is used for office copying.
Office photocopiers that used xerography technology were first introduced in 1960s. Gradually these office photocopiers replaced photocopies made by mimeograph machines, carbon paper etc.

Office photocopier is the most convenient of making a copy of a paper document.
Big offices generally use digital photocopiers as they are multifunctional and can complete a time taking task in a very short time. Some digital copiers can also function as very high speed scanners. Using digital copiers you are able to send documents through email Small and mid sized companies use office photocopiers that adopt xerography technology.

Important parts of an office toner are toner, drum, paper, cartridges, lubes etc. Toner is pigmented powder

An office photocopier that uses xerography technology works as follows:

Charging: The drum surface is charged electro statistically by high voltage wire. The surface of the drum is coated with photoconductive material. Photoconductors are semi conductors that have the ability to conduct electricity when they are exposed to light.

Exposure:  A very bright lamp lights up the original document. White areas of original document reflect light on the photo conductive surface of the drum. The areas of drum which are exposed to the light are the areas which correspond to the white areas of original document. These surface areas of the drum become conductive and are therefore discharged to the ground. Areas of drum surface that are unexposed to light are those areas which correspond to the black portions of original document. These unexposed areas of drum remain negatively charged. As a result latent electrical image is generated on the drum surface.

Developing: Toner particles are positively charged. When these toner particles are applied to drum surface to develop the required image, the toner particles are attracted and stick to the areas which are negatively charged.

Transfer: The resulting image on the drum surface is transferred from drum surface onto a paper that has a higher negative charge.

Fusing: Charged rollers exert high pressure and high heat on toner particles which melt and stick to the paper to give a photocopy of that original document.