Development of multi joint gripper and its dexterous grasping

In our research, we have developed a Gripper with Multi Joint Fingers (MJF) that achieves envelope grasping adapting to shape of objects. In this paper, we discuss grasping motion using two or three MJFs. The MJF has 4 serially connected joints controlled by only two actuators, one for driving all joints at the same time for envelope grasping, the other for controlling the stiffness of every joint all together. This MJG achieves envelope grasping adapting various object shapes without sensory feedback from finger parts. The paper also reports an extended mechanism that enables a smooth transition from a state of pinching object with fingertips to a stable envelope grasping. It also shows the gripper can detect a multiple contact points during envelope grasping with no touch or force sensors on the finger sole.

[1]  Koichi Koganezawa,et al.  Dexterous gripping of a hand with multi-joint fingers , 2016, 2016 IEEE International Conference on Advanced Intelligent Mechatronics (AIM).

[2]  Mark R. Cutkosky,et al.  Varying spring preloads to select grasp strategies in an adaptive hand , 2011, 2011 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[3]  Gen Endo,et al.  Development of a light duty arm with an active-fingertip gripper for handling discoid objects , 2010, 2010 IEEE/RSJ International Conference on Intelligent Robots and Systems.

[4]  Ryuta Ozawa,et al.  Design of low-cost and easy-assemblable robotic hands with stiff and elastic gear trains , 2016, 2016 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS).

[5]  Kenjiro Tadakuma,et al.  Robotic finger mechanism equipped omnidirectional driving roller with two active rotational axes , 2012, 2012 IEEE International Conference on Robotics and Automation.

[6]  Shigeo Hirose,et al.  Biologically Inspired Robots: Snake-Like Locomotors and Manipulators , 1993 .

[7]  Takumi Tamamoto,et al.  Multi Joint Gripper with Differential Gear System , 2015 .

[8]  Yoji Umetani,et al.  The Development of Soft Gripper for the Versatile Robot Hand , 1978 .