The patent linked below addresses various design features of the Champion 4500, including the stalk divider tips between the saw rotors and the slanted arrangement of the two central feed drums.
Here is an application from 1984, which deals with the damaging of corn-cernels in a disc wheel chopper:
This application, which dates back to 1982, is about the interlocking and the transfer of stems from one transfer rotor to the next:
This application, which dates back to 2000, concerns the drive train of the corn headers: