Abstract
The driving link of nongrashof planar four-link mechanisms, that none of two adjacent links can make a complete rotation, oscillates in such a manner that coupler and driven links take different forms of two link chain in going and returning respectively. A driving method of the nongrashof mechanism is presented, where two links to be revolute-paired the stationary link are driven by turns by four sets of sector gear trains to be rotated by one motor.
