Abstract
A direct method is presented for the synthesis of a large class of approximate straight line mechanisms based on a set of two equations describing the center of curvature of the path (the coupler curve) of an arbitrary point on the coupler of a crank-slider mechanism with an off-set. Several examples are discussed to establish the capability of the proposed set of equations to incorporate the classical approximate straight-line mechanisms (e.g. Watt, Chebyshev and Scott-Russell) as the special cases of the synthesis which can be constructed directly based on graphical considerations. A straightforward design of a luffing-crane mechanism and a graphical construction of a special mechanism which generates two mutually orthogonal straight lines are also presented to further illustrate the general versatility of the proposed method of synthesis.
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