The ornamental design for a chainspringpin for a food packaging machine, as shown and described.
FIG. 1 is a bottom, front, right, and perspective view of the chain spring pin for a food packaging machine showing my new design;
FIG. 2 is a right view thereof;
FIG. 3 is a left view thereof;
FIG. 4 is a front view thereof;
FIG. 5 is a back view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken line in the drawings disclosure identifies the unclaimed portion of the chain spring pin for a food packaging machine only and forms no part of the claimed design.