Strange Gearbox: Old Factory Maintenance Engineer Needs Help

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A maintenance engineer discovered an unusual gearbox in an old factory machine, resembling harmonic drives but functioning differently. The gearbox transmits motion from the motor shaft via a key to bearings, which then transfer motion to elliptical gears solely through bearing rotation. The bearings rotate smoothly, raising questions about the design and functionality of the gearbox. The engineer seeks insights or information from others who might recognize this type of gearbox. Additional visual documentation, such as pictures, could aid in identifying the mechanism.
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hello everyone i am a maintenance engineer in old factory so while we were working on an old machine yesterday we found a very strange gear box like the harmonic drives but it transmitts the motion from the motor shaft by a key to bearings those bearings transmitts motion to a elliptic shaped gears only by bearing rotation although the bearing can rotate smoothly
if anyone has an idea about this gear box pls help me
 
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maxx_payne said:
hello everyone i am a maintenance engineer in old factory so while we were working on an old machine yesterday we found a very strange gear box like the harmonic drives but it transmitts the motion from the motor shaft by a key to bearings those bearings transmitts motion to a elliptic shaped gears only by bearing rotation although the bearing can rotate smoothly
if anyone has an idea about this gear box pls help me

Pictures?
 
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