I know.I have had an identical machine for about 20 years. If it has the original motor it should be a 1 hp 111/220 volt motor. I have switched the wiring on mine several times depending n where it's located in the shop. Some years a 220 volt outlet is closest, other years it's been a 110 volt outlet. Parts are still available, but be seated if you call Rockwell. Their prices could easily give you a heart attack.
When I got mine a bearing had gone out and it destroyed the top roller. I could have bought a new machine for the price Rockwell was asking for parts. I was lucky to find an entire idler roller assembly on e Bay at a reasonable price.