The ornamental design for a cordwinder for earphones, as shown and described.
FIG. 1 is a top perspective view of a cord winder for earphones;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a left side elevational view thereof;
FIG. 5 is a right side elevational view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is a perspective view thereof;
FIG. 9 is a perspective view thereof; and,
FIG. 10 is a perspective view thereof.
The broken lines showing of the cord, ear phones and cellular phone in FIGS. 8-10 represent an environment only and form no part of the claimed design.