This article presents a new variable actuation mechanism based on the 3-RPR parallel robot. This mechanism is an evolution of the NaVARo robot, a 3-RRR parallel robot, for which the second revolute joint of the three legs is replaced by a scissor to obtain a larger working space and avoid the use of parallelograms to operate the second revolute joint. To obtain better spatial rigidity, the leg mechanism is constructed by placing the scissors in an orthogonal plane to the plane of the manipulator displacement (3-RRR or even the 3-RPR). This geometric property brings the significant consequence of allowing the scissors to directly substitute the prismatic chains in the 3-RPR and enjoy the same kinematics advantages for the overall robots as only one solution to the inverse kinematic model. From the Jacobian expression, surfaces of singularity can be calculated and presented in a compact form. The singularity equations are presented for a robot with a similar base and mobile platform. The properties of the scissors are then determined to have a prescribed regular workspace.
NAVARO II, a Novel Scissor-Based Planar Parallel Robot1
Contributed by the Mechanisms and Robotics Committee of ASME for publication in the Journal of Mechanisms and Robotics. Manuscript received October 9, 2018; final manuscript received March 27, 2019; published online May 17, 2019. Assoc. Editor: Pinhas Ben-Tzvi.
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Chablat, D., and Rolland, L. (May 17, 2019). "NAVARO II, a Novel Scissor-Based Planar Parallel Robot." ASME. J. Mechanisms Robotics. August 2019; 11(4): 044501. https://doi.org/10.1115/1.4043330
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