Abstract
In this paper, a stiffness adjust mechanism using wryness of two strings is devised, and a tension/torque conversion mechanism is constituted the adjust mechanism and a disc. The purpose of the tension/torque conversion mechanism analysis is to find a string stiffness changes by its wryness. Tension/torque conversion mechanism (i.e. divided into restrictions and the disc) is modeled. From a characteristic experiment, the propriety of the model is examined, and the stiffness change by wryness of strings is clarified.