A Dexterous and Self-Adaptive Humanoid Robot Hand: Gcua Hand

Gesture-changeable under-actuated (GCUA) function is put forward to make traditional under-actuated hands feel easy to grasp different objects and do simple operations dexterously, simultaneously, this function can lower control difficulties of robotic hands. Based on GCUA function, a GCUA hand based on pulley-belt mechanism is designed in detail and manufactured. The Hand can grasp different objects self-adaptively and change its initial gesture dexterously before touching objects. The hand has 5 fingers and 15 DOFs, each finger utilizes screw-nut transmission, flexible drawstring constraint and belt-pulley under-actuated mechanism to realize GCUA function. The analyses on grasping static forces and grasping stabilities are given. The analyses and experimental results show that GCUA function is very nice and valid. The hands with GCUA function can meet the requirements of grasping and operating with lower control and cost, which is the middle road between traditional under-actuated hands and dexterous hands.