Fusing Speed Control - Konica Minolta BizHub C360 Service Manual

Theory of Operation Ver. 1.0 Jul. 2009
20.3.8

Fusing speed control

A. PPM control
• To achieve the intended level of fixability of printed images, the printed pages value is
reduced in the multi-print cycle, thereby preventing fixability from being degraded due to
the continuous printing. The following five different types of modes are available for PPM.
Control execution
PPM mode
conditions
Low tem-
Room temperature at
perature
the start of the print
environ-
cycle is 18°C or less
ment mode
High Environmental
humidity humidity at the start
environ- of the print cycle is a
ment mode predetermined value
*2 or more
"Mode 3" is selected
Paper curl
for "Change Warm
suppres-
Up Time" of the ser-
sion mode
vice mode
Print request is
received for paper
Roller end
with a paper width of
tempera-
209 mm or less
ture rise
Temperature of the
suppres-
heating roller ends
sion mode
becomes a predeter-
mined value or more
Only an insufficient
power is supplied to
Reduced the fusing heater
power sup- lamp, resulting in a
ply mode fusing temperature
lower than a prede-
termined value
*1: Multi-print speed calculation example:
If a multi-print cycle is run using A4-size paper on the bizhub C360, the multi-print speed
at 100% is 35.6 printed pages/min. and that at 90% is 32.04 printed pages/min.
*2: Execution of the control for the high humidity environment mode can be prohibited by
turning ON "No. 5 PPM control (high humidity environment mode) prohibited" of Engine
FW DIP switch of Enhanced Security of the service mode. (This can prevent the multi-
print speed from decreasing as a result of the execution of the high humidity environ-
ment mode. As a side-effect, paper curl due to high humidity can occur.)
Purpose
To prevent fixability from being
To achieve the degraded even when a multi-print
intended level of cycle is run, paper-to-paper dis-
fixability under low tance is widened to reduce the
temperature envi- multi-print speed and prevent the
ronment fusing temperature from decreas-
ing.
To prevent paper from curling
To suppress even when a multi-print cycle is
occurrence of run under high humidity environ-
paper curl under ment, paper-to-paper distance is
high humidity envi- widened to reduce the multi-print
ronment speed and prevent the fusing
temperature from decreasing.
To prevent paper from curling
To suppress
even when a multi-print cycle is
occurrence of
run under any condition other
paper curl under
than high humidity environment,
conditions other
paper-to-paper distance is wid-
than high humidity
ened to prevent the heating roller
environment
temperature from decreasing.
To prevent the temperature of
To suppress inor-
heating roller ends from rising
dinate rise in tem-
even when a multi-print cycle is
perature on
run, paper-to-paper distance is
heating roller ends
widened to reduce the multi-print
in a print cycle
speed and promote decrease in
using paper of a
the heating roller end tempera-
small size
ture.
To prevent fixability from being
To achieve the degraded even when a multi-print
intended level of cycle is run, paper-to-paper dis-
fixability under low tance is widened to reduce the
power supply con- multi-print speed and prevent the
dition fusing temperature from decreas-
ing.
20. FUSING SECTION
Specific controls
Multi-print
speed *1
100%
90%
80%
70%
60%
50%
100%
70%
50%
100%
50%
100%
90%
80%
70%
60%
50%
40%
30%
70%
50%
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