A packaging machine for closing containers is provided having a supply device for supplying containers to be closed; a removal device for removing closed containers ; and a closing device between the supply device and the removal device. A training signal is injected into the echo canceller and to the echo path during a training interval, or period. Control information defining the formats is transmitted across the wireless communication link and the data packets are transmitted using the selected physical layer formats. The first connecting portions respectively hold free ends of the levers of the base frame therein. The information recording apparatus includes an irradiation source for irradiating a light spot on the optical recording medium, and a controller for controlling an irradiation position of an optical spot from the irradiation source.