Konica Minolta 5430 DL 5440 DL 5450 - Manual (Page 137)

Fusing Section Main Unit Theory of Operation
2-100
II Comp
osition
/O
p
eration
• The fusing speed is not changed during a single job.
• When the last piece of media for that particular job moves past the Paper Exit Roller, the
Fusing Motor speed is switched to the 1/3 speed.
B. Fusing speed control (control of loop before fusing)
• To prevent double transferred images and brush effects from occurring, the difference
between the fusing speed and the media conveyance speed during image transfer is cor-
rected.
• The Paper Loop Sensor (PC6) detects the length of the loop formed in the media
between the 2nd Transfer Roller and the Fusing Pressure Roller. The fusing speed is
then varied according to the length of the loop detected. By varying the fusing speed, any
effects from the Fusing Pressure Roller side (part-to-part variations, change of parts over
time) are prevented from being transferred to the 2nd transfer section.
• No loop control is provided to perform the fusing process at high speeds when envelopes
are used (to prevent wrinkles).
☞ 2-90
• Fusing deceleration (low speed):
When the media loop length is small, the actuator of the Paper Loop Sensor (PC6) is
pushed up a small amount and the sensor is unblocked. When the sensor is unblocked,
the fusing speed is decelerated (-1.36%).
• Fusing acceleration (high speed):
When the media loop length is large, the actuator of the Paper Loop Sensor (PC6) is
pushed up a large amount and the sensor is blocked. When the sensor is blocked, the
fusing speed is accelerated (+1.64%).
4138to2069c1
4138to2069c2
Fusing Pressure
Roller
2nd Transfer Roller
Paper Loop Sensor
Actuator
Fusing deceleration Fusing acceleration
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