A Study on Ring for Cop-Change Bobbin

Abstract

To determine the optimum size of the split ring for a cop-change bobbin, we have analyzed the elastico-plastic behaviors of the ring when it is fitted onto the bobbin, and established the following relations: With the ring data given as γ₀, d, σ_Y, E, r, D₁, D₂, (see Figures 1 and 2), we can first calculate m_c by the equation (9), and then ΔD^c' _min can be found easily from Figure 5. On the other hand, ΔD^c' _min must satisfy the condition (25) if the ring is to be fixed firmly onto the bobbin. An analysis made by this procedure on a Japan Industrial Standards (JIS) ring shows that the diameter of the ring wire is too large for the ring to be fixed firmly on the bobbin.