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JRM Vol.30 No.6 pp. 855-862
doi: 10.20965/jrm.2018.p0855
(2018)

Paper:

Development of Gripper to Achieve Envelope Grasping with Underactuated Mechanism Using Differential Gear

Takumi Tamamoto*, Keita Takeuchi**, and Koichi Koganezawa**

*Department of Intelligent Robotics, Toyama Prefectural University
5180 Kurokawa, Imizu-shi, Toyama 939-0398, Japan

**Department of Mechanical Engineering, Tokai University
4-1-1 Kitakaname, Hiratsuka-shi, Kanagawa 259-1292, Japan

Received:
June 25, 2018
Accepted:
October 10, 2018
Published:
December 20, 2018
Keywords:
gripper, multi-joint finger, differential gear, variable stiffness
Abstract
Development of Gripper to Achieve Envelope Grasping with Underactuated Mechanism Using Differential Gear

Envelope grasping by multi joint gripper

In a previous study, we developed a seven-axis multi-joint gripper (MJG) with a mechanism for varying the joint stiffness and showed that it was capable of dexterous grasping. In this research, we expand this design by introducing a hand with several multi-jointed fingers. The mechanism of grasping with this hand involves the use of serially connected differential gear systems (DGSs). The DGSs are controlled by only two actuators: one for driving the joints simultaneously and the other for adjusting the stiffness of all of the joints. The hand is shown to successfully grasp and envelope objects of some shapes without sensory feedback and handle objects by pinching them with the finger tips and subsequently transitioning to an envelope grasp. The mechanism that significantly contributes to this result is the tip roller attached to the fingertip. It is incorporated into the joint drive mechanism using a DGS. These functionalities are considerably advantageous in scenarios where information about the objects to be grasped, such as the shape and precise position, cannot be obtained.

Cite this article as:
T. Tamamoto, K. Takeuchi, and K. Koganezawa, “Development of Gripper to Achieve Envelope Grasping with Underactuated Mechanism Using Differential Gear,” J. Robot. Mechatron., Vol.30, No.6, pp. 855-862, 2018.
Data files:
References
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Last updated on Dec. 10, 2019