The ornamental design for a mountingseat for a driving device of a window blind, as shown and descrobed.
FIG. 1 is a perspective view of the mounting seat for a driving device of a window blind showing my new design;
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; and,
FIG. 8 is a perspective view showing two of the mounting seat for a driving device of a window blind being assembled with each other.
The broken lines of FIG. 6 depict a portion of a mounting seat for a driving device of a window blind in which the design is embodied that forms no part of the claimed design.
The broken lines of FIG. 8 illustrate the environmental structure only and form no part of the claimed design.