Apple Color LaserWriter 12/600 PS ation User Manual download pdf (Page 133)

95.08.23.11.30

Color LaserWriter 12/600 PS Basics & Theory 1–122

Oil

Circulation

System

In order to prevent the tracking of toner onto the fuser rollers, the

printer uses an oil circulation system to lubricate the rollers.

Note: Laser printer engines typically have fuser lubrication, but

usually in the form of oil-impregnated rollers. Due to the high fusing

temperature and the characteristics of the mono-component toner used

in this printer, additional lubrication is required.

An oil applying roller remains in contact with the upper fuser roller.

When the fuser assembly drive clutch (CL4) is engaged, the main

motor drives the upper and lower fuser rollers, the oil applying roller,

and the oil pump.

The oil sent from the oil bottle to the oil pan under the oil bottle case is

collected using the pump and then dropped from the oil nozzle down to

the oil applying roller. Very small amounts of oil remain on the oil

applying roller and the oil applying blade. As the applying roller

rotates, the oil blade controls the amount of oil and then the oil is

applied to the upper fuser roller. Any excessive oil drops from both

ends of the applying blade down to the oil tank and then drops down to

the oil catch tray after passing through a pipe. The oil catch tray has a

ﬁlter that ﬁlters out dust and other foreign matter. The ﬁltered oil is

sucked by the pump into the oil bottle for recirculation.

The amount of oil remaining in the fuser oil bottle is detected by the

oil-low sensor (PS13) mounted to the chassis behind the fuser

assembly. As the oil level drops, a ﬂoating ball in the fuser oil bottle

interrupts PS13 and the oil sensor signal (

OILSNS) goes “H.”

Lower Fuser Roller

Oil Catch Tray

Pipe

Pump

Oil Nozzle

Oil Applying Roller

Oil Pan

Upper Fuser Roller

1 2 ... 128 129 130 131 132 133 134 135 136 137 138 ... 375 376

No comments

Apple Color LaserWriter 12/600 PS ation User Manual Page 133