Sharp AR-650 Servisní příručka stáhnout pdf (Strana 259)

FUSER UNIT 14 - 2

14.3 Functions

(1) Heater lamp

Two halogen lamps are provided inside the upper heat roller to heat the upper heat roller. The heater

lamp stays fixed even when the upper heat roller is rotating.

(2) Upper heat roller

The upper heat roller is made of aluminum having comparatively good heat conducting properties. It

is heated by the heater lamps. The upper heat roller is held in contact with the above-mentioned

lower heat roller. Fusing is carried out by passing the transfer paper through the section where these

two heat rollers contact each other so that the toner image on the paper faces the upper heat roller.

In other words, the toner is melted by the heat of the upper and lower heat rollers, and the heat

transfer efficiency is improved by the pressure of the lower heat roller so that the toner soaks in

between the fibers of the paper.

To prevent adhesion of toner onto the rollers (phenomenon called “offset”) and to facilitate separation

of toner from the upper heat roller, the surface of the upper heat roller is coated with Teflon.

(3) Lower heat roller

The lower heat roller is made of rubber to facilitate pressurization of the upper heat roller. The lower

heat roller is pressed against the upper heat roller by springs.

(4) Separation claw

The upper and lower separation claws separate paper affixed to the upper and lower heat rollers.

(5) Cleaning roller 2

A cleaning roller 2 is attached so as to contact the upper heat roller to clean the toner that has stuck

to the upper heat roller during the fusing process. This roller contains silicon oil that transfer to the

surface of the heat roller by the heat of the heat roller and so on. This makes it easier to clean the

toner on the heat roller.

(6) Cleaning roller 1

A cleaning roller 1 for the upper heat roller is attached so as to contact the upper heat roller to remove

toner and paper scraps that have stuck to the upper heat roller during the fusing process. This clean-

ing roller 1 does not contain silicon oil.

(7) Cleaning roller 3

A cleaning roller 3 is attached so as to contact the press roller to remove the toner and paper scraps

that have stuck to the press roller during the fusing process. This roller contains silicon oil that trans-

fer to the surface of the press roller by the heat of the press roller and so on. This makes it easier to

clean the toner and paper scraps on the press roller.

(8) Cleaning roller 4

A cleaning roller 4 is attached so as to contact the lower heat roller to remove the toner and paper

scraps that have stuck to the lower heat roller during the fusing process.

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Sharp AR-650 Servisní příručka Strana 259