by Scott Larson » Mon Nov 19, 2007 3:52 pm
The Litter Robot's trick is that the liner is flexible with a weight in its center. As the globe turns, the weight pulls the liner down causing it to hang down into the globe. This flexes the liner and tends to knock off any litter that's sticking to it.
No, it is not a perfect system. Litter stuck to the edges of the liner will usually hang on since that part of the liner doesn't move as much when the globe turns.