Konica Minolta magicolor 5550 Service Manual page 83

14. Transfer section (2nd transfer)
C. Pressure/retraction operation
1. Rotation of the intermediate transport motor is transmitted to the drive roller of the
intermediate transfer belt unit.
2. Rotation of the drive roller is transmitted to the pressure/retraction clutch/2.
3. When the pressure/retraction clutch/2 is energized, the rotation is transmitted to the
pressure cam via a coupling gear.
4. When the pressure cam turns a half turn to push up the pressure lever, the 2nd
transfer roller is pressed against the transfer belt.
5. At the same time, the IDC sensor lever is pushed up to open the IDC sensor cover.
6. The light blocking plate fitted on the shaft of the pressure cam blocks the retraction
position sensor/2 and a pressed position of the 2nd transfer roller is detected.
7. When the pressure/retraction clutch/2 is energized a second time, the pressure
cam is turned another half turn. This releases the pressure lever, causing the 2nd
transfer roller to be retracted from the transfer belt. At the same time, the IDC sen-
sor lever is released, which closes the IDC sensor cover.
8. The light blocking plate unblocks the retraction position sensor/2 and a retracted
position of the 2nd transfer roller is detected.
Transfer belt
drive roller
Retraction
cam
When pressed
48
2nd transfer roller
Retraction
lever
Pressure/retraction
clutch/2 (CL5)
4138to2063c0
2nd transfer
roller
Retraction lever
4138to2064c0
Retraction cam
Theory of operation Ver. 1.0 Nov. 2006
When retracted
4138to2071c0
41382070c0