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A coffee machine includes a grinding mill, a proportioning chamber arranged adjacent to the outlet of the grinding mill and a processing chamber, into which the coffee powder from the proportioning chamber is discharged. The coffee powder coming from the grinding mill is thrown into the proportionin

A coffee machine includes a grinding mill, a proportioning chamber arranged adjacent to the outlet of the grinding mill and a processing chamber, into which the coffee powder from the proportioning chamber is discharged. The coffee powder coming from the grinding mill is thrown into the proportioning chamber, which includes a pressure sensitive, elastically resilient wall element with a signal generator connected thereto. As soon as the proportioning chamber is filled with coffee powder, a dynamic pressure is built-up within the proportioning chamber due to the overpressure caused by the grinding mill, which forces the wall element to a displacement, whereby the signal generator is operated. Subsequently, on the one hand, the motor of the grinding mill is switched off and, on the other hand, a bottom wall part of the proportioning chamber is unlocked, whereby the milled product, assisted by the elastically resilient wall element, is discharged from the proportioning chamber.

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A process for proportioning of coffee powder in a coffee machine comprising a grinding mill driven by an electric motor, a closed proportioning chamber having a resilient wall portion, and a processing chamber, the process comprising the steps of: feeding coffee beans into said grinding mill and ope

A process for proportioning of coffee powder in a coffee machine comprising a grinding mill driven by an electric motor, a closed proportioning chamber having a resilient wall portion, and a processing chamber, the process comprising the steps of: feeding coffee beans into said grinding mill and operating said grinding mill to produce coffee powder, discharging the coffee powder from said grinding mill into the closed proportioning chamber, sensing coffee powder volume alteration in the proportioning chamber, and generating an electrical signal upon filling the proportioning chamber to a predetermined volume for stopping operation of said electric motor and thereby said grinding mill and for simultaneous opening of the proportioning chamber to discharge its content into the processing chamber; the step of sensing the coffee powder volume alteration in the proportioning chamber comprising the step of sensing a change in the shape of the resilient wall portion.