Servo Motors....?

Hi Gang,
I am enquiring about a couple of motors I have pulled out of
Risograph high speed printers.
These are gear motors with the following specs.

DC 24 volt
5 Amps
150 Revs
43 Kg/cm
1:24 Ratio
serial# = 3022G-24F-9K24F
Tokushu Denso, Japan.
Forgetting about the revs, torque etc I would like to know if they
would be suitable for a servo driven router, minus the gearbox of
course. They have a rotory encoder on the rear with 120 slots and a
3 wire connection to the pickup (red,white,black), they have brushes
on the armature and are about 3" dia and about 4" long over the motor
body excluding the gearbox and two wire connections (Red,Blue).

What type of driver would be suitable for these if they are in fact
useful and if the encoders don't have enough resolution then could
the motors be geared down with tooth belts to reach a useful
resolution.

All help will, as usual, be held invaluable to me.

Regards from Richard.