use it is sufficient to mount the tank on the machine with the sensor in place and operate the switch 42 for activating the filling up means until triggering of the automatic filling up process takes place that is until the sensor 33 for detecting the presence of the filling up liquid is reached by the liquid and therefore enables the automatic operation of the filling up device the automatic filling up will go on automatically until the liquid in the tank reaches the probe end 20 at this point the device 25 stops the liquid admission every time drawing liquid from the tank causes the liquid level to fall to such a height that the probe is completely uncovered the filling up device will begin operating for restoring the appropriate level when sensor 33 detects exhaustion of the filling up liquid or the syrup the automatic filling up will be stopped and lighting of the signalling means will warn the operator of the necessity of refilling at this point it is apparent that the intended purposes have been achieved in a machine made in accordance with the invention any additional operation following dismantling or reassembling of the tank is no longer necessary and in addition said machine offers an intrinsic operating safety furthermore since the filling up device is completely held in the shoulder it leaves the aesthetic appearance of the machine substantially unchanged as compared with known machines and avoids the presence of additional devices being positioned around the machine obviously the above description of an embodiment applying the innovatory principles of the invention is given for purposes of illustration only and therefore must not be considered as.