I claim the ornamental design for a yarn unwinding control ring, as shown and described.
FIG. 1 is an environmental view of the yarn unwinding control ring;
FIG. 2 is a bottom plan view of the yarn unwinding control ring;
FIG. 3 is a bottom perspective view of the yarn unwinding control ring;
FIG. 4 is a top plan view of the yarn unwinding control ring;
FIG. 5 is a top perspective view of the yarn unwinding control ring;
FIG. 6 is a side view of the yarn unwinding control ring; and,
FIG. 7 is a cross-sectional view of the yarn unwinding control ring taken at section line 7 in FIG. 6.
In FIG. 1, the yarn package and supply canister shown in broken lines represent environmental components in a textile machine and form no part of the claimed design.