Method and device for producing a coffee preparation

A method for automatically producing a coffee preparation by means of a coffee preparation device (1), which comprises a brewing unit, comprising the following steps:

• (a) inserting a cartridge (3), which is prefilled with a powder supply (4) of ground coffee beans, which is preferably compressed and which comprises a plurality of powder portions (11), into a cartridge accommodation (2) of a preparation device (1);
• (b) metering of a powder portion (11) from the powder supply (4), wherein the entire powder supply (4) is displaced for this purpose, preferably axially displaced, with the help of metering means (10), and the powder portion (11) is then separated from the powder supply (4), the metering means (10) comprise an automatically drivable compression die (6), which is moved for metering the powder portion in the cartridge (3) and which thereby presses on one of (a) directly on the powder supply (4), (b) directly on a deformable or displaceable cartridge section, and (c) to displace the entire cartridge (3);
• (c) transferring the powder portion (11) to a brewing unit of a preparation mechanism (16);
• (d) automatic preparation of the coffee in the brewing unit using the powder portion (11) and a heated, drinkable liquid, which flows through the powder portion in the brewing unit under pressure;
• (e) sealing the cartridge (3) in the area of an outlet opening (5) of the cartridge in the preparation device.