Panasonic FP-D250 User Manual page 47

Reference:
• The twin field magnetic roller provides enhanced developing performance by a
wider developing area which results from two pole peaks (S1 and S2 pole)
facing the drum surface.
• N2 through S3: Attracts the developer to the sleeve from the mixing mill.
• S3 pole: Raise the head of the developer and controls the head height
via the doctor blade.
• N2 through S1: Transfers the developer to the developing position.
• N1 through N2: Separates the developer from the sleeve.
3) Driving developer
• The revolution of the main motor is transmitted to the developer drive gear via
the respective drive gears and belt. The developer unit receives drive from the
main motor by the respective gear. The sleeve gear is connected to the mixing
mill gear and the transport screw gear to mix and transfer the developer.
Magnetic
roller
Drum
2-10
Main motor
Flywheel
Developer unit