18. Fusing section
Theory of Operation Ver. 1.0 Sep. 2008
90
bizhub C200
Composition/Operation
18.3.3
Fusing pressure roller pressure/retraction mechanism
• To ensure prolonged durability of the fusing belt, the pressure roller is retracted*
1
from
the fusing belt during any time other than a print cycle. (The roller is, however, retracted*
1
during a print cycle using envelopes.)
*1: The pressure roller does not completely retract but is slightly pressed to the fusing
belt.
• The fusing pressure roller retraction motor is turned forward or backward to press the
pressure roller up against, and retract it from, the fusing belt. When the motor rotates, the
fan-shaped gear will rotate to move the pressure roller.
• The fusing pressure home sensor detects the pressed position of the pressure roller. The
retracted position of the pressure roller is determined by counting a predetermined num-
ber of encoder pulses from the pressed position using the fusing pressure retraction sen-
sor.
• Pressure/retraction timing
*2: Pressure/retraction will be conducted after the currently printed paper passes between
the fusing belt and the pressure roller. The timing for the next paper to be fed will be
delayed during the pressure/retraction and keep the certain period of time between
feeding the papers.
9J06T2C006DA
A02FT2C052AA
Pressure roller
Sector gear
Pressure operation
Retraction operation
Conditions
Pressure/retraction operation
Warm-up
At the start of a warm-up cycle
Pressure
At the completion of a warm-up cycle in a high humid-
ity condition
Retraction
Standby
At the completion of the fusing belt preliminary rota-
tion
Retraction
Printing
For envelopes
Retraction
For paper types other than envelopes
Pressure
When printing
the multi jobs
When current printing is for other than envelopes and
the next job is for the envelopes.
Pressure
o
Retraction *
2
When current printing is for the envelopes and the
next job is for other than envelopes.
Retraction
o
Pressure *
2
Power save mode ON
Retraction
When the fusing heater lamp is turned OFF (a door opened, a mal-
function occurs, or other factors.)
Retraction
Theory of Operation Y109670-2