Process and apparatus for preparing and dispensing coffee

1. An apparatus for preparing and dispensing coffee or other beverage by infusion of a material, said apparatus comprising:

a supporting frame ( 2 ), a cylindrical infusion chamber ( 3 ) with a substantially vertical axis ( 4 ), said chamber ( 3 ) being mounted on said supporting frame ( 2 ) and able to move, by a motor, in translation with respect to said frame ( 2 ) along a direction parallel to the axis of the infusion chamber, a lower piston ( 12 ) forming a bottom wall in said chamber, said wall being movable in said infusion chamber ( 3 ), a feed chute ( 6 ) mounted on said supporting frame ( 2 ) which is able to rotate with respect to said frame in order to feed ground coffee to said infusion chamber ( 3 ), a higher piston ( 14 ) for closing said infusion chamber during the beverage infusion step, characterized in that said apparatus comprises a control unit provided or connected with a memory ( 22 ), wherein a plurality of positions of said chamber ( 3 ), said lower piston ( 12 ) and said chute ( 6 ) are stored; and in that said apparatus further comprises means for determining a position of each of said chamber ( 3 ), said lower piston ( 12 ) and said chute ( 6 ); means for checking whether coordinates α, h1 and h2, the coordinates obtained by the position-determining means, correspond to coordinates stored in said memory associated with the selected beverage; and means for changing the position of the chamber ( 3 ), the lower piston ( 12 ) and the chute ( 6 ) in response to the coordinates obtained by the position-determining means correspond to the stored coordinates adapted for the beverage to be dispensed.

2. The apparatus according to claim 1 , comprising means for determining the coordinates α, h1 and h2, where α is the tilt angle of said chute ( 6 ) with respect to said chamber axis ( 4 ), h1 is the distance of the chamber ( 3 ) from the upper base ( 19 ) of said frame ( 2 ) and h2 is the distance of said lower piston ( 12 ) from the upper wall ( 15 ) of said infusion chamber ( 3 ).

3. The apparatus according to claim 1 , wherein said feed chute is mounted on a point of said frame and rotatable with respect to an axis perpendicular to the axis ( 4 ) of translation of said infusion chamber, in order to change the tilt of the chute itself with respect to said infusion chamber ( 3 ), and wherein said chute comprises an arm extending above said frame from said mounting point to said chute.

4. The apparatus according to claim 3 , wherein respective cam surfaces ( 9 , 10 ) are provided and associated with said feed chute ( 6 ) and said infusion chamber ( 3 ) in order to position said chute with respect to said chamber.

5. The apparatus according to claim 4 , wherein the cam surfaces ( 9 , 10 ) associated with said infusion chamber are arranged on the upper edge of means ( 11 ) ejecting a coffee tablet after the infusion.

6. The apparatus according to claim 1 , comprising at least one sensor for detecting the position of the chamber ( 3 ).

7. A computer program comprising codes executable by a computer for optimizing the distribution of powdered coffee or other material in an infusion chamber of an apparatus for preparing and dispensing coffee or other beverage according to claim 1 , said program being stored in a memory unit readable by a computer and comprising:

computer executable codes for determining the positions of said chamber ( 3 ), said lower piston ( 12 ) and chute ( 6 ),

computer executable codes for checking whether said positions correspond to those stored in said memory ( 22 ) as adapted for the beverage to be dispensed;

computer executable codes for changing, in case, the position of the chamber ( 3 ) and the position of the lower piston ( 12 ) up they reach the corresponding stored positions for the selected beverage.

8. The program according to claim 7 , further comprising computer executable codes for determining the values h1, h2 and α, where α is the tilt angle of said chute ( 6 ) with respect to said chamber axis ( 4 ), h1 is the distance of the chamber ( 3 ) from the upper base ( 19 ) of said frame ( 2 ) and h2 is the distance of said lower piston ( 12 ) from the upper wall ( 15 ) of said infusion chamber ( 3 ).

9. The program according to claim 8 , further comprising computer executable codes for determining the values h1, h2 and α corresponding, for a determined coffee amount, to a chamber position in which the required distribution of coffee into said chamber ( 3 ) is obtained.