For a Stephenson II Six-Bar mechanism, because the rotatability of its input link is different corresponding to its different circuit and the input link even oscillate with respect to the frame through an angle more than 360°, the problem of whether a crank exist in this type of mechanisms is still pending. Based on the model established for circuit analysis of Stephenson six-bar chains, this paper presents a method of detecting the existence of a crank in this type of mechanisms. The result has significant value for linkages synthesis.

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