Abstract: A machine for the preparation and dispensing of espresso coffee comprises: a coffee boiler, a filter holder with a filter for a pressed coffee powder puck, and a pre-infusion chamber and a hydraulic circuit for transporting pressurized water from the coffee boiler to the pre-infusion chamber. The machine further comprises a device for detecting a parameter indicative of the filling of the pre-infusion chamber and of the hydraulic circuit so that the step of dispensing of an espresso coffee can be started on the basis of the detected filling parameter.

Abstract: An espresso coffee machine is described, said machine comprising a pump (1) for pumping water, a dispensing group (25) configured to cooperate with a portafilter (35), wherein said portafilter (35) is configured to support a filter (40) loaded with coffee powder, a coffee boiler (15) in fluid communication with said dispensing group (25), a water dispensing system (16, 28, 29, 30) for supplying hot water from said coffee boiler (15) to said portafilter; and a system (16, 31, 6, 33, 14) for supplying steam to said dispensing group (25) so as to perform cleaning of at least a part of said water dispensing system (16, 28, 29, 30).

Abstract: An espresso coffee machine comprising at least one dispensing group (1003) which dispenses shots of espresso coffee, a pressure sensor (24, 25) positioned at the dispensing group (1003), a measuring device and a control unit (30) is described. The pressure sensor (24, 25) provides values of the dispensing pressure (P1) in the dispensing group (1003). The measuring device provides values indicating the amounts of liquid at the inlet or the outlet of the dispensing group (1003). Using the values of the dispensing pressure (P1) received from the pressure sensor (24, 25) and the values indicative of the amount of liquid which are received from the measuring device, the control unit (30) controls the dispensing pressure (P1) of each shot according to a profile of the dispensing pressure (P1) as a function of the amount of liquid.

Abstract: A machine for the preparation and dispensing of espresso coffee is described, said machine comprising: a coffee boiler, a filter holder with a filter for a pressed coffee powder puck, a pre-infusion chamber and a hydraulic circuit for transporting pressurized water from said coffee boiler to the pre-infusion chamber, wherein said machine further comprises a device for detecting a parameter indicative of the filling of said pre-infusion chamber and of said hydraulic circuit so that the step of dispensing of an espresso coffee can be started on the basis of said defected filling parameter.

Abstract: An espresso coffee machine is described, said machine comprising a pump (1) for pumping water, a dispensing group (25) configured to cooperate with a portafilter (35), wherein said portafilter (35) is configured to support a filter (40) loaded with coffee powder, a coffee boiler (15) in fluid communication with said dispensing group (25), a water dispensing system (16, 28, 29, 30) for supplying hot water from said coffee boiler (15) to said portafilter; and a system (16, 31, 6, 33, 14) for supplying steam to said dispensing group (25) so as to perform cleaning of at least a part of said water dispensing system (16, 28, 29, 30).