A Ricoh copier
works quite simply for thevast majority of persons. It only need you to
approach the machine, lift up thelid, place the document to be copied
face down on the glass and then close thelid. And then you select what
kind of copy (i.e. smaller, larger, lighter,darker, etc.), press start
and during the working process of the copier you candoing other matter
like answering a phone call. However, exactly what does goon inside the
machine? Below is the guide from Hotsun Imaging Products Co.,Ltd. to the
working principle of the Ricoh copier.
In fact, a Ricoh copier
is based on one ofthe most fundamental laws of physics: Opposite charges
attract. Staticelectricity is at the heart of a copier’s
functionality.
Charging: The cylindrical drum surroundedby a high
voltage wire is called a corona wire or a charge roller. The
cylindricaldrum has been coated by a
photoconductivematerial. Though a photoconductor is a
semiconductor but it will becomeconductive when exposed to light.
Exposure:
The original document isilluminated by a bright lamp. The light in the
white areas of the originaldocument is reflected onto the surface of the
photoconductive drum. The whiteareas exposed to light become conductive
and then discharge to the ground whilethe area of the drum not exposed
to light remain negatively charged. As aresult there will be a latent
electrical image on the surface of the photoconductivedrum.
Developing:
When the toner powder withpositive charge is applied to the cylindrical
drum to develop the image, itwill be attracted and sticks to the areas
with negatively charges which is notexposed to light.
Transfer: A higher negative chargestransfer the toner image on the surface of the photoconductive drum onto apiece of paper.
Fusing: The rollers with high heat andpressure melt and bond the toner powder.
Therefore, in conclusion, Ricoh copiers utilizesa negatively
charged drum and paper and positively charged toner to reflect thedark
areas to develop the image, which is the major principle of copier
imagedeveloping. As we know that the components for copiers, such as OPC
drum( drumunit), toner powder, developer unit, lamp and the corona wire
etc. belong tothe consumable easy to be destroyed.Replacing the
destroyed components in time can ensure the printing quality ofcopiers.
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