A Constant-Force Compliant Gripper for Handling Objects of Various Sizes

This paper presents the design, simulation, and testing of a compliant gripper that can provide a constant gripping force to handle objects of various sizes. Maintaining a proper gripping force is challenging when manipulating delicate objects with uncertain sizes and stiffnesses. To avoid damage and provide a stable grip of an object, force feedback is often required so that the gripping force can be directly or indirectly regulated. Without using additional sensors and control, the proposed gripper passively maintains a constant prespecified contact force between fingertip and object. The gripper is designed to have a constant input force generated by a constant-force mechanism (CFM). Transmitted through a statically balanced (SB) mechanism, a constant gripping force is obtained at the fingertip. After a formulation to find the optimal gripper configuration, the design is verified through comparison with simulation results. Finally, a prototype of the constant-force gripper is demonstrated. The novel gripper is expected to serve as a reliable alternative for object manipulation.

[1]  Just L. Herder,et al.  CONCEPT AND MODELING OF A STATICALLY BALANCED COMPLIANT LAPAROSCOPIC GRASPER , 2009 .

[2]  Larry L. Howell,et al.  A Compliant On/Off Connection Mechanism for Preloading Statically Balanced Compliant Mechanisms , 2012 .

[3]  Chao-Chieh Lan,et al.  An Adjustable Constant-Force Mechanism for Adaptive End-Effector Operations , 2012 .

[4]  N. Jalili,et al.  Toward Ultrasmall Mass Detection Using Adaptive Self-Sensing Piezoelectrically Driven Microcantilevers , 2007, IEEE/ASME Transactions on Mechatronics.

[5]  Kang Tai,et al.  Design of 2-DOF Compliant Mechanisms to Form Grip-and-Move Manipulators for 2D Workspace , 2010 .

[6]  Che-Min Lin,et al.  A Self-Sensing Microgripper Module With Wide Handling Ranges , 2011, IEEE/ASME Transactions on Mechatronics.

[7]  Just L. Herder,et al.  Towards the Design of a Statically Balanced Compliant Laparoscopic Grasper Using Topology Optimization , 2008 .

[8]  Joseph Eugene Pishnery.  A Statically Balanced Shape Shifting Surface , 2012 .

[9]  Mary Frecker,et al.  Optimal Design and Fabrication of Narrow-Gauge Compliant Forceps , 2011 .

[10]  A.M. Dollar,et al.  A robust compliant grasper via shape deposition manufacturing , 2006, IEEE/ASME Transactions on Mechatronics.

[11]  Christine Vehar Jutte,et al.  Design of Single, Multiple, and Scaled Nonlinear Springs for Prescribed Nonlinear Responses , 2010 .

[12]  Jae-Bok Song,et al.  Object grasping using a 1 DOF variable stiffness gripper actuated by a hybrid variable stiffness actuator , 2011, 2011 IEEE International Conference on Robotics and Automation.

[13]  Fan Yu Chen.  Gripping mechanisms for industrial robots: An overview , 1982 .

[14]  Ole Hansen,et al.  Electro-thermally actuated microgrippers with integrated force-feedback , 2005 .

[15]  G. K. Ananthasuresh,et al.  Miniature Compliant Grippers With Vision-Based Force Sensing , 2010, IEEE Transactions on Robotics.

[16]  Toshiyuki Takagi,et al.  The application of superelastic SMAs in less invasive haemostatic forceps , 2007 .

[17]  Chao-Chieh Lan,et al.  A compliant constant-force mechanism for adaptive robot end-effector operations , 2010, 2010 IEEE International Conference on Robotics and Automation.

[18]  Just L. Herder,et al.  Negative Stiffness Building Blocks for Statically Balanced Compliant Mechanisms: Design and Testing , 2010 .

[19]  Chao-Chieh Lan,et al.  Functional joint mechanisms with constant-torque outputs , 2013 .

[20]  B. Nelson,et al.  Monolithically Fabricated Microgripper With Integrated Force Sensor for Manipulating Microobjects and Biological Cells Aligned in an Ultrasonic Field , 2007, Journal of Microelectromechanical Systems.

[21]  S. Sokhanvar,et al.  A multifunctional PVDF-based tactile sensor for minimally invasive surgery , 2007 .

[22]  M. S. Evans,et al.  Dynamic modeling of compliant constant-force compression mechanisms , 2003 .

[23]  Wei Wang,et al.  Design and Realization of Multimobile Robot System With Docking Manipulator , 2010 .

[24]  Dar-Zen Chen,et al.  Design of Perfectly Statically Balanced One-DOF Planar Linkages With Revolute Joints Only , 2009 .

[25]  Chao-Chieh Lan,et al.  Distributed Shape Optimization of Compliant Mechanisms Using Intrinsic Functions , 2008 .

[26]  Giuseppe Radaelli,et al.  An Energy Approach to Static Balancing of Systems With Torsion Stiffness , 2011 .

[27]  Lionel Birglen,et al.  Design of an Underactuated Compliant Gripper for Surgery Using Nitinol , 2009 .

[28]  Chao-Chieh Lan,et al.  An Analytical Contact Model for Design of Compliant Fingers , 2008 .