19. Fusing section
Theory of Operation Ver. 8.0 Jun. 2008
13
2
Composition/Operation
19.3.4
Fusing loop control
A. Adjustment of the loop amount
• By creating a paper loop, the speed difference between the fusing and paper convey-
ance at 2nd transfer part will be adjusted. It prevents the double transferred image or
brush effect.
• The fussing speed is controlled (speed up/speed down) according to the amount of
paper loop.
• The loop amount detection sensor/1, /2 turns ON in different timing according to the loop
amount so that the loop amount can be detected in three stages.
B. Operation flow
1.
It starts controlling when the front-edge of the paper reaches to the predetermined
position before the fusing pressure roller.
2.
When the fusing speed goes faster, the paper will create fewer loops between the
2nd image transfer roller and the pressure roller.
3.
The control will finish when the back-edge of the paper passes the predetermined
position on the back of the transfer roller.
Loop amount detection
sensor/1
Loop amount detection
sensor/2
Loop amount
Fussing speed
Unblocking
Blocking
large
Speed - up - Fast
Unblocking
Blocking
average
Speed - up - Slow
Blocking
Blocking
small
Slowdown
A00JT2C260AA
Loop amount:
small
Fusing pressure roller
Loop amount: large
Loop amount detection sensor/1
(PS41)
Loop amount detection sensor/2
(PS42)
Block timing differs
according to the
shape
2nd image transfer roller
Theory of Operation Y107522-3
