Synthesis of Watt-I path generators with coupler points passing through three or four acceleration poles

This article presents a synthesis technique for the planar Watt-I six-bar mechanism with a coupler point passing through three or four acceleration poles. The parametric equations for the loci of the acceleration pole on the fixed link and the coupler plane of the Watt-I mechanism driven by a crank with a constant rotational speed are derived. The desired coupler point of a path generator passing through three or four acceleration poles should be a triple or quadruple point on the locus of the acceleration pole described on the coupler plane. Using the parametric equations and multiple points on the locus of the acceleration pole on the coupler plane, the procedure for synthesizing the Watt-I path generator with a coupler point passing through three or four specified acceleration poles that accord with the specified crank angles is proposed. Two examples are provided to illustrate the feasibility of the proposed method.