Pink and orange gears are fixed together.
The pink gear and the blue one have revolution joints with green bar.
The orange gear and the violet one have revolution joints with yellow bar. The gears have the same tooth number. The two bars and the orange and pink gear block create a 4-bar linkage.
Input is the violet gear rotating regularly.
The bars and the blue gear rotate irregularly.
Their motion depends on the 4-bar linkage dimension.