Grasping through dynamic weaving with entangled closed loops

Gyeongji Kang, Young-Joo Kim, Sung-Jin Lee, Se Kwon Kim, Dae-Young Lee () and Kahye Song ()
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Gyeongji Kang: Korea Institute of Science and Technology (KIST)
Young-Joo Kim: Seoul National University
Sung-Jin Lee: Korea Advanced Institute of Science and Technology (KAIST)
Se Kwon Kim: Korea Advanced Institute of Science and Technology (KAIST)
Dae-Young Lee: Korea Advanced Institute of Science and Technology (KAIST)
Kahye Song: Korea Institute of Science and Technology (KIST)

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Pick-and-place is essential in diverse robotic applications for industries including manufacturing, and assembly. Soft grippers offer a cost-effective, and low-maintenance alternative for secure object grasping without complex sensing and control systems. However, their inherent softness normally limits payload capabilities and robustness to external disturbances, constraining their applications and hindering reliable performance. In this study, we propose a weaving-inspired grasping mechanism that substantially increases payload capacity while maintaining the use of soft and flexible materials. Drawing from weaving principles, we designed a flexible continuum structure featuring multiple closed-loop strips and employing a kirigami-inspired approach to enable the instantaneous and reversible creation of a woven configuration. The mechanical stability of the woven configuration offers exceptional loading capacity, while the softness of the gripper material ensures safe and adaptive interactions with objects. Experimental results show that the 130 g·f gripper can support up to 100 kg·f. Outperforming competitors in similar weight and softness domains, this breakthrough, enabled by the weaving principle, will broaden the scope of gripper applications to previously inaccessible or barely accessible fields, such as agriculture and logistics.

Date: 2023
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DOI: 10.1038/s41467-023-40358-y

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