Consider a machine for converting rotational motion to rectilinear translation, such as a crank slider or scotch yoke.
When the slider is at either of its two translational extremes (where the crank center, crank joint, and slider joint are all in a line), the machine is stable in the sense that applying a force on the slider (in the direction of the slider) does not result in any torque on the crank.
My question is: Is there a machine that converts rotational motion to rectilinear motion where the machine is stable (in this sense) when the slider is between its translational extremes?