Dosing device for a filter holder of an espresso coffee machine and dosing method implemented with such a device

A dosing device for dispensing predetermined doses of ground coffee into a filter holder of an espresso coffee machine, comprising:

• a grinder of roasted coffee granules positioned on a support base,
• a discharge conduit of ground coffee coming from said grinder,
• a discharge opening at an end of said conduit,
• a station, in said support base, for positioning the filter holder in which a dose of ground coffee is fed,
• a body provided with of a plurality of compartments wherein the volume of each compartment is equal or greater than to a respective predetermined dose of ground coffee, each compartment being provided with a top, with a relative opening, and a bottom, the bottom being provided with members for opening and closing thereof, said body being displaceable between a first position in which the top of one of the compartments is open and positioned at said opening of the discharge conduit of ground coffee and a second position in which the bottom of one of the compartments is positioned above said station of the filter holder, there being provided a body actuator configured to carry out displacements of said body provided with compartments, and a bottom opening actuator configured to actuate said members for opening and closing the bottom of the compartment when the compartment is in the position above the station of the filter holder.