The speed of driven link 2, rotating about fixed axis A-A, is an aperiodic function of the rotation of wheel 3 about fixed axis B-B, i.e. the required motion of link 2 can be obtained only for a certain range of values of the angle of rotation of driving link 3. The axis of link 4 has plane translational motion which depends upon the angle of rotation of the driving link. Intermediate wheel 4 rotates about an axle mounted in slide-blocks 5 which can move perpendicular to the axes of the wheels in a plane parallel to these axes. Slide-blocks 5 slide in the guides of link 6 which is traversed by screw 7 parallel to the axes of the wheels a distance proportional to the angle of rotation of the driving link. Screw 7 is driven through a train of gears from link 3. Motion is converted according to the equation β=log(1+10α)+mα where α is the angle of rotation of the driving link, β is the angle of rotation of the driven link and m is a positive constant.
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