Brother HL-3450CN Service Manual page 86

(3) Clutches (Refer to Fig.4-31.)
No. Name
1 Paper feeding clutch
2 Registration clutch
3 Fuser clutch
4 Cleaner clutch
Developer clutch
5 8
9 TR cam clutch
10 Cleaner cam clutch
Function
To feed paper by coupling the feed roller to the
main gear unit at the correct timing for paper
feeding.
To transport paper by coupling the register roller to
the main gear unit synchronized with the rotation of
the transfer drum.
To drive the fusing rollers by coupling the fusing
unit to the main gear unit.
To drive the brush of the drum cleaner by coupling
the cleaner clutch to the main gear unit at the
correct timing for drum cleaning.
To drive the magnetic roller of the desired color
toner cartridge by coupling that toner cartridge to
the developer gear unit during developing.
To make the transfer roller contact the transfer
drum surface at the time of the second transfer.
To make the drum cleaner contact the surface of
the transfer roller at the correct timing for drum
cleaning.
NOTE: The cleaner cam clutch is identical to the
TR cam clutch.
4-33
HL-3450CN SERVICE MANUAL