著者

福田 敏男 下中 賢

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.54, no.504, pp.1812-1820, 1988-08-25

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This paper deals with the coordination force distribution at finger joints for an articulated hand, under the assumption that the articulated hand with multiple degrees of freedom and a multiple articulated joint structure grasps some objects. In this study, four algorithms for this force distribution problem in grasping some object are derived from the static equilibrium conditions. Furthermore, a method for changing contact and non-contact fingers in grasping is derived and some simulations are shown, where changing fingers implies that some non-contacting fingers begin to make contact with the object, while the other contacting fingers do not contact it, keeping the stable grasping conditions by hand as a whole. Finally, based on the proposed five control algorithms, a control flow of stable grasping methods for the force distribution at each joint is made for an overall control of the finger system by determining grasping forces to changing grasping fingers.

著者

福田 敏男 下中 賢

出版者

一般社団法人日本機械学会

雑誌

日本機械学會論文集. C編 (ISSN:03875024)

巻号頁・発行日

vol.53, no.487, pp.731-738, 1987-03-25

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The flexible functions of a human five finger hand with a palm are first studied from the viewpoint of force sensory manipulation, unlike the conventional viewpoint of position based manipulation. Then it is cleared that more than half of human hand work is related to force sensory information. Based on this examination, the degree of freedom of an articulated finger hand is determined to realize such a flexible manipulation as a human hand, so that twenty five degrees of freedom are necessary for a hand with consideration of joints inside the palm which have not been taken into acount so far. An Artificial finger hand with twenty five degrees of freedom is built for experiments by employing the wire and spring mechanism. Finally, an evaluation concept of three dimensional grasping is presented as a cross-section method by calculating applied forces and moments in a plane virtually cut arbitrary inclined angles around the center of a grasped object.