Paper Cooling - Gestetner A294 Service Manual

FUSING

2.10.6 PAPER COOLING

[A]
[C]
[B]
A294D631.PCX
The paper cooling pipe cools the copy paper after it has gone through the fusing
unit. This prevents the temperature around the drum from increasing in duplex
mode.
The paper cooling pipe has fins at the rear end. A fan cools the fins.
The paper cooling pipe has a hollow metal tube inside. Water capillary tubes [A]
run along the inside of the paper cooling pipe, and these transfer heat within the
pipe. The hot paper [B] leaving the fusing unit heats the parts of the cooling pipe
that it touches (black arrows [C]), causing the water in the pipe to vaporize. This
creates a high-speed flow of steam [D] to the ends of the pipe, which are cooler,
and especially to the rear end [E], which is well away from the paper feed path, and
has the cooling fins [F] attached to it. When the steam reaches that area, it cools
and condenses. The condensed water is returned to the heated part of the pipe by
capillary action.
This cycle (vaporization → steam transfer → condensation) repeats again and
again. The paper cooling pipe transfers heat from the paper to the fins
continuously.
The paper cooling pipe fan [G] in the duct [H] at the machine rear side cools the
fins [F].
A294/A295
CÓPIA NÃO CONTROLADA
[E]
[D]
2-106
CÓPIA NÃO CONTROLADA
[H]
[B]
[F]
[G]
A294D653.WMF
SM