Interchangeable drive with balancing gears

Claim 1

In an interchangeable drive for operatively connecting a gear train system to a driving gear, wherein the driving gear generates unbalanced radially directed forces, the combination of A. a pair of spaced side carriers interposed between the gear train system and the driving gear, 1. said side carriers being provided with aligned openings, 2. said openings receiving and journalling the driving gear therein, 3. said side carriers being removably connected to the driving gear by a flange bearing which journals the driving gear within the aligned openings; B. a speed determining driven gear journalled in a shaft which is supported within the side carriers, 1. said speed determining driven gear meshing with the driving gear and a gear of the gear train system to transmit rotative energy from the driving gear; C. first and second balancing gears journalled on shafts which are supported within the side carriers, 1. said balancing gears meshing with the driving gear and being driven thereby, 2. said balancing gear shafts and the speed determining driven gear shaft cooperating to absorb any unbalanced, radially directed forces generated by the driving gear, 3. the said balancing gears serving as idlers only and transmitting no rotative forces to any other gear, and 4. the said balancing gears and said speed determining driven gear being angularly positioned about the periphery of the driving gear wherein three gears simultaneously mesh with the driving gear at respective peripherally angularly offset locations.