Surface - Page 62

Confidential

3 - 1 7

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 Transfer 

(1) Transfer 

process 

After the drum has been charged and exposed, and has received a developed image, the toner  
formed is transferred onto the paper by applying a negative charge to the back of the paper. 
The negative charge applied to the paper causes the positively charged toner to leave the  
drum, and adhere to the paper.  As a result, the image is visible on the paper. 

(2) 

Cleaning process of transfer roller 

If the toner is not transferred onto the paper perfectly it is possible that there may be residual  
toner on the drum which will adhere to the transfer roller.  The transfer roller voltage  
changes to a positive voltage during non-printing rotation of the drum.  Therefore the  
transfer roller is cleaned by returning the positively charged toner adhering to the transfer  
roller onto the exposure drum. 

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 Fixing 

stage 

The image transferred to the paper by static electricity is fixed by heat and pressure when passing  
through the heat roller and the pressure roller in the fixing unit .  The thermistor keeps the surface  
temperature of the heat roller constant by detecting the surface temperature of the heat roller and  
turning on or off the halogen heater lamp. 

Heat roller

Fixing unit 

Halogen heater

Pressure roller