1St Transfer Roller Pressure/Retraction Position Control - Konica Minolta magicolor 5550 Service Manual

13. Transfer section (1st transfer)
13.3.5

1st transfer roller pressure/retraction position control

A. Pressure position control
• The pressure and retraction operation of the 1st transfer roller is controlled as the retrac-
tion position sensor/1 detects the movement of the sliding plate.
1. The pressure/retraction clutch/1 is energized.
2. The sliding plate is moved to press the 1st transfer rollers up against the transfer
belt, which blocks the retraction position sensor/1.
3. After the lapse of a predetermined period of time after the retraction position sen-
sor/1 has been blocked, the pressure/retraction clutch/1 is de-energized.
B. Retraction position control
• The pressure and retraction operation of the 1st transfer roller is controlled as the retrac-
tion position sensor/1 detects the movement of the sliding plate.
1. The pressure/retraction clutch/1 is energized.
2. The sliding plate is moved to retract the 1st transfer rollers from the transfer belt. As
a result, the retraction position sensor/1, which has been blocked, is now
unblocked.
3. After the lapse of a predetermined period of time after the retraction position sen-
sor/1 has been unblocked, the pressure/retraction clutch/1 is de-energized.
Retraction position sensor/1 (PS9)
C. Pressure/retraction operation timing
1st image transfer roller retracted
1st image transfer roller pressed
Retraction position sensor/1 (PS9)
Retraction position sensor/1 (PS9)
Pressure cam angle
42
blocked
unblocked
Theory of operation Ver. 1.0 Nov. 2006
Sliding plate
4138to2046c1
4138to2046c2