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Input: blue crank receiving rotation from a motor via a belt drive of green and blue pulleys. Satellite pulley of pink crank rotates on the blue crank thanks to a belt drive of stationary pulley (in grey). Diameter of the grey pulley is double the one of the pink pulley. The pink crank traces an ellipse (in green) that approximates the oval-shaped runway. Cyan conrod connects the pink crank with the orange slider (roller) and makes the latter move in the oval-shaped runway. Velocity of the slider along the runway is not constant. Two last scenes of the video show the way to transmit motion to 6 sliders. This concept can be used for The Oval Lazy Susan:
