Konica Minolta bizhub c650 Service Manual page 110

Theory of Operation Ver. 8.0 Jun. 2008
14.3.2 1st Image Transfer Roller mechanism
• The machine is provided with a mechanism that presses the 1st Image Transfer Rollers
up against the inside of the Transfer Belt during the 1st image transfer stage. The 1st
Image Transfer pressure retraction motor provides the drive for this operation.
• The retraction position sensor /K detects the retraction position of the 1st image transfer
roller /K, and then detects the retraction position of the 1st image transfer rollers /Y, M, C.
• To detect pressure and retraction positions, the K and color sliding plate positions are
detected respectively.
• In the pressure operation, a predetermined pulse controls the stop position.
A. Pressure/retraction operation
• Pressure operation
1. Drive from the 1st Image transfer pressure retraction motor is transmitted through a
gear train to the drive gear.
2. Rotation of the drive gear turns the pressure cam, which allows the Sliding Plate to
move.
3. As the Sliding Plate moves, the spring is released. This lowers the 1st Image Trans-
fer Roller and the roller presses against the Transfer Belt.
• Pressure operation
1. Under the pressure operation, if the drive gear turns either forward or backward,
the pressure cam rotates. This pushes and moves the sliding plate.
2. As the Sliding Plate moves, the Pressure Lever is then pressed to raise the 1st
Image Transfer Roller, allowing the roller to leave the Transfer Belt.
K Sliding plate
1st image transfer
pressure retraction
motor (M21)
When Retracted
1st Image Transfer Roller
Color sliding plate
K cam
Spring
A00JT2C045DA
14. Transfer Corona section
Color cam
A00JT2C044DA
When Pressed
A00JT2C046DA
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