Fabric Unfolding Using Pinching Slip Motion

Abstract

We discuss an unfolding of fabrics by robotic hands. During unfolding, humans usually allow their fingertips to slip on the fabric surfaces, referred to as a pinching slip motion. We define this motion using differential geometry coordinate. In this motion, the weight of the fabric generates relative movement between the moving fingertips and the fabric, and then, the edges of the fingertips are in contact with the hem of the fabric. We confirm experimentally that the success rate depends on fingertip shapes and grasping force of a robotic hand during the motion. The range between fingertips can be selected widely when fingertips with circular edges are applied. Finally, we demonstrate a fabric unfolding experimentally.