2. Product Specifications and Description
2.5. Image Creation
2.5.1. Printing process overview
This machine uses four drum units, four deve unit, and four laser beams for color printing. Each drum unit consists of a
drum, charge roller, cleaning blade. Each deve unit consists of a magnetic roller, mixing auger.
The OPC drum [A] is charged with a negative voltage and is exposed by the light from the LSU (Laser Scanning unit) [B].
The light produced by the laser creates a latent image by discharging on the surface of the OPC drum. The negatively
charged toner is attracted to the latent drum image due to an electric field. The toner (real image) on each OPC drum is
moved to the transfer belt[C] by the positive bias applied to the first transfer roller. All four toners (color image) are
transferred to the paper by a positive charge applied to the second transfer roller[D].
1)
OPC drum charge
: The charge roller gives the drum a negative charge.
2)
Laser exposure
: Light produced by a laser diode hits the charged OPC through the lens and mirrors.
3)
Development
: The developing roller carries negatively charged toner to the latent image on the drum surface. This
machine uses four independent drum units and deve units.
4)
Transfer
•
Image transfer : The first transfer rollers opposite the OPC drums transfer toner from the drums to the transfer belt.
Four toner images are super-imposed onto the belt.
•
Paper transfer : The second transfer roller transfers the toner from the transfer belt to the media.
5)
Cleaning for OPC drum
: The cleaning brush and blade remove remaining toner on the drum surface after image
transfer to the paper.
6)
Quenching for OPC drum
: Quenching is done by illuminating the whole area of the drum with the laser at the end
of every job.
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