The A320 T/E flaps don't use a ballscrew actuator though as per those patent drawings.
The A320 flap actuators simply rotate an arm that pushes the flaps down the track, it is much simpler than the ballscrew design, certainly to model anyway.
Heres a pic of the flap actuator in the extended positon;
http://farm3.static.flickr.com/2281/...8f1bf123c5.jpg
The actuator rotates through about 90deg IIRC, and literally pushes the flap down the track, or pulls it back up the track.
Heres a pic of the trailing edge, you can see how the actuators connect the the flaps themselves.
Photos: Airbus A320-231 Aircraft Pictures | !!!!!!!!!!!!!!
As the movement is only about ~90deg, to push/pull them, I'd not bother modelling it as such with torque tubes and geared actuators. Mount some small rc servos on the rear spar of your model, and actuate those the 90deg.
Heres a pic from the manuals; Hard to see whats happening being B&W but you should be able to work it out if you look at the photos above first:
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HTH