Abstract: A molding apparatus particularly adapted to be associated to a meat chopper to mold the extruded ground meat into hamburgers. The said apparatus is provided with a feeler or snesor which disactivates the meat chopper when a hamburger has been formed and which re-activates said meat chopper when the emptied mold is re-introduced into the formation chamber. The feeler or sensor is mounted on the housing or body of the meat chopper so as to be self-adjustable as to its spacing from the formation mold when the positioning of the molding apparatus of the invention changes due to the wear of the meat chopper knives.