Automatic dosing apparatus, particularly for coffee supplying machines, comprising a water feeding pump, a heat exchanger for heating the water, and a supplying group for feeding heated water to a filter containing ground coffee, comprising, between said pump and exchanger thermal, a dosing group arranged to feed predeterminable amounts of water to the heat exchanger and which includes a cylindrical chamber and a sliding piston under conditions of hermetic sealing therein, which divides it into an upper zone and a lower zone, being obtained said predeterminable amount of water, fed to the heat exchanger, partly during the descent of the piston into said chamber and partly during the elevation thereof, means being provided for controlling the dosing group. (Machine-translation by Google Translate, not legally binding)
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