My research revealed !
JPS: as always, you're on target. A corn sheller seems to be the most popular suggestion that I found for a machine that would do the job, and I hadn't heard of the coffee sheller. Thanks.
This thread seems to have digressed, and nobody offered another source for a walnut skinner. The reason for my inquiry is that my father in law is already tired of driving on the hulls with the car. So that kills that suggestion, as we already knew about driving on the hulls.
Other methods of shucking the husks: build a commercial shucker with a car tire and a surround-screen. power it with some sort of motor, and you get rapid action walnut husking.
Another old guy published an article on his methods of processing walnuts. He stated that he did best with a knife held with a vise: cut the equator, twist both hemispheres loose, then toss the shell into a bucket of water for washing later. No mess, and the halves separated from the shell easily once cut with a knife.
In my research, I found that there IS a market for the hulls of the black walnuts: apparently, they are much sought after by the oil industry, both as an abrasive and for some other purpose I don't remember. And they are popular as an abrasive in general for other industries.
The oak gall ink is supposed to be blacker than the walnut ink, and the formula for cooking ink up was rather simple: mash up the rotten husks (or galls) boil 'em up real good, filter the mess, then boil it down to 1/2 the volume. More ink than you need for several years.
Thanks for all the input, guys. It's been fun.
Now: does anybody know of any brand of machine that was made to shuck the husks off walnuts?