The ornamental design for a paperpunch, as shown and described.
FIG. 1 is a front perspective view of a paper punch showing the new design;
FIG. 2 is a front perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a right side thereof;
FIG. 6 is a left side thereof;
FIG. 7 is a top view thereof;
FIG. 8 is a bottom view thereof; and,
FIG. 9 is a front perspective view showing the storage compartment open.
The broken lines showing features and surfaces in the front view of FIG. 3 are included for the purpose of showing portions that form no part of the claimed design.