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It is a combination of two sine mechanisms sharing a common yellow slider. Input: green (or violet) crank. Output: the other crank. It turns at the same input velocity but in opposite direction. Input and output are coaxial. Disadvantages: - Inertia forces created by reciprocating parts. - Dead positions when output crank is vertical. The mechanism becomes a regular coupling (no reversing) when the cranks are set to be always parallel.
