Title: 3D two-fingered caging for two types of objects: sufficient conditions and planning

Authors: Satoshi Makita; Kensuke Okita; Yusuke Maeda

Addresses: Department of Control Engineering, Sasebo National College of Technology, 1-1 Okishin-cho, Sasebo, Japan ' Utsunomiya Plant, Canon Inc., 19-1 Kiyohara-Kougyoudanchi, Utsunomiya, Japan ' Division of Systems Research, Faculty of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama, Japan

Abstract: Caging is a method to capture an object geometrically by robots. Position-controlled robots can make the object inescapable from the robot formation. Moreover less number of mobile robots or a robot hand with low degrees of freedom can constrain the object with considering concavity of the object. In this paper, we propose two types of caging: ring-type and waist-type, which both can be accomplished by a two-fingered hand. We derive sufficient conditions for caging of the two types and construct RRT-based motion planner for caging by a robotic arm/hand system. In motion planning, we find one of final configurations that satisfy the sufficient conditions and produce a path of robot configuration to the goal. With object recognition using AR picture markers, we can acquire geometrical information of objects and plan robot motion for caging. We show some experimental results of planning and execution of planned caging motion for four objects.

Keywords: caging; multifingered hands; manipulation; motion planning; object recognition; automation; robot positioning; object capture; mobile robots; robot hands; two-fingered hands; robot motion.

DOI: 10.1504/IJMA.2013.058376

International Journal of Mechatronics and Automation, 2013 Vol.3 No.4, pp.263 - 277

Received: 22 Oct 2012
Accepted: 19 Sep 2013

Published online: 18 Dec 2013 *

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