Switch-based Independent Antagonist Actuation with a Single Motor for a Soft Exosuit.

Area of Science:

• Robotics
• Biomechatronics
• Mechanical Engineering

Background:

• Cable-driven soft exosuits face mechanical design challenges, especially for multi-degree-of-freedom (DoF) actuation.
• Current solutions often require multiple actuators per DoF, limiting practicality for complex, multi-joint exoskeletons.

Purpose of the Study:

• To propose and evaluate a novel switch-based mechanism for controlling antagonist cable pairs in soft exosuits.
• To reduce the number of actuators required for multi-DoF actuation in exoskeleton systems.

Main Methods:

• Development of a switch-based mechanism to control an antagonist pair of cables.
• Testing the mechanism's ability to actuate along arbitrary cable path geometries.
• Measurement of the time latency associated with switching between cables.

Main Results:

• The proposed mechanism allows actuation along any cable path geometry using a reduced number of actuators.
• A switching time of 298.24 milliseconds was recorded between cables.
• The observed latency can potentially be reduced with optimized motor selection in future iterations.

Conclusions:

• The switch-based mechanism offers a simplified and generalizable approach to designing cable-driven soft exosuits and exo-gloves.
• This innovation paves the way for more versatile exoskeleton platforms for both clinical rehabilitation and personal assistive use.