Abstract: Traditional pantograph mechanism consists of a parallelogram with two extended sides. It can scale the distance from the pole to a given point. However it can not scale the distance between any given points. This goal is achieved by using inter-connected multi parallelograms with a link chosen as a driver. The result is a class of linkages that can enlarge or shrink a planar graph by driving a revolute pair. These mechan- isms can be single degree-of-freedom or over-constrained.

Key words: Overconstrained linkages, Parallelogram mechanisms, Planar pantograph