The ornamental design for an stand for tyingbows, as shown and described.
FIG. 1 is a front perspective view of an stand for tying bows embodying my new design;
FIG. 2 is a right side view thereof;
FIG. 3 is a left side view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a rear view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The structural elements depicted by means of broken lines in the figures are shown for the purpose of illustrating portions of the stand for tying bows that form no part of the claimed design.