We claim the ornamental design for a thermal head for a printer, as shown and described.
FIG. 1 is a front perspective view of the claimed design;
FIG. 2 is a rear perspective view of the claimed design of FIG. 1;
FIG. 3 is a bottom perspective view of the claimed design of FIG. 1;
FIG. 4 is a front view of the claimed design of FIG. 1;
FIG. 5 is a rear view of the claimed design of FIG. 1;
FIG. 6 is a left side view of the claimed design of FIG. 1;
FIG. 7 is a right side view of the claimed design of FIG. 1;
FIG. 8 is a top view of the claimed design of FIG. 1; and,
FIG. 9 is a bottom view of the claimed design of FIG. 1.
The claim is directed to the solid line subject matter below the boundary lines and to the two solid edge portions between the front and top surfaces. All other subject matter is illustrated with broken lines that show portions of the article that form no part of the claimed design. Broken lines formed by equal length dashes show unclaimed portions of the article. Broken lines formed of unequal length dashes show boundaries between claimed and unclaimed portions of the article.