We claim the ornamental design for a switching device for projector, as shown.
FIG. 1 is a front, top and right side perspective view of a switching device for projector showing our 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 top plan view which removed the lid.
The broken lines in the FIG. 1, FIG. 3, FIG. 4, FIG. 5, FIG. 7 and FIG. 8 are included for the purpose of illustrating portions of the switching device for projector that form no part of the claimed design.