Filter-holder for coffee machines with means for adjusting the quality of the coffee, and a machine comprising said filter-holder

1. A filter-holder for coffee machines, comprising:

a cup in which a coffee filter is inserted;

at least one delivery spout;

associated with said delivery spout, a valve for stabilizing the infusion back-pressure;

a passage coupled between the valve and said delivery spout; and

a regulating device downstream between the valve and the at least one delivery spout for modifying the flow rate of the coffee coming from the stabilizing valve by modifying a cross section of at least a portion of the passage.

2. The filter-holder according to claim 1 , wherein said cup contains a block comprising: a body of the back-pressure stabilizing valve, an orifice including a seat, positioned within the passage, and the regulating device comprising a shutter element, wherein the regulating device is configured to modify the cross-section of the passage by modifying a position of the shutter element relative to the seat.

3. A coffee machine comprising a filter-holder according to claim 1 .

4. A filter-holder for coffee machines, comprising:

a cup in which a coffee filter is inserted;

at least one delivery spout;

associated with said delivery spout, a valve for stabilizing the infusion back-pressure; and

a regulating device for modifying the flow rate of the coffee coming from the stabilizing valve, wherein said regulating device comprises an adjustable shutter element for modifying the cross-section of an orifice for the delivery of the coffee positioned between said valve and said delivery spout.

5. The filter holder according to claim 4 , wherein said pressure stabilizing valve comprises:

an inlet that places the inside of said cup in fluid communication with a pressure compensating chamber; and

an outlet that places the pressure compensating chamber in communication with said outlet orifice, wherein said pressure compensating chamber comprises an elastic member associated with means for throttling the inlet in order to modify the cross-section of said inlet.

6. A filter-holder for coffee machines, comprising:

a cup in which a coffee filter is inserted;

at least one delivery spout;

associated with said delivery spout, a valve for stabilizing the infusion back-pressure;

a regulating device for modifying the flow rate of the coffee coming from the stabilizing valve; and

a grip attached to said cup, wherein said regulating device extends along said grip and includes operating means attached to said grip.

7. The filter-holder according to claim 6 , wherein said regulating device extends inside a longitudinal seat within a grip.

8. The filter-holder according to claim 6 , wherein said operating means are attached to the opposite end of said grip with respect to said cup.

9. The filter-holder according to claim 6 , wherein said regulating device comprises a rod extending approximately parallel to said grip, a first end of which is associated with said operating means and the second end of which is associated with an element for adjusting the cross-section of said orifice for the delivery of the coffee, located between the pressure stabilizing valve and the delivery spout.

10. The filter-holder according to claim 9 , wherein said rod is elastically loaded in the axial direction and is capable of rotation around its own axis to modify said cross section of the outlet orifice arranged between the pressure stabilizing valve and the delivery spout.

11. A filter-holder for coffee machines, comprising:

a cup in which a coffee filter is inserted;

at least one delivery spout;

associated with said delivery spout, a valve for stabilizing the infusion back-pressure;

a regulating device for modifying the flow rate of the coffee coming from the stabilizing valve, said regulating device including a perforated body defining a path for the flow of coffee, with an inlet and an outlet, and that said inlet is in fluid communication with said orifice, the respective positions of said orifice and said inlet being adjustable so as to modify the cross section of said orifice.