A grinder for grinding coffee beans having a first grinding tool and a second grinding tool forming a grinding nip, and the second grinding tool being rotatable relative to the first grinding tool. The grinder has at least one force generation device for applying a selectable force F to a first grinding tool or a second grinding tool, which force can be transmitted to the coffee beans. A coffee machine having such a grinder and a method for preparing coffee using said type of coffee machine and said type of grinder.

A grinder for grinding coffee beans having a first grinding tool and a second grinding tool forming a grinding nip, and the second grinding tool being rotatable relative to the first grinding tool. The grinder has at least one force generation device for applying a selectable force F to a first grinding tool or a second grinding tool, which force can be transmitted to the coffee beans. A coffee machine having such a grinder and a method for preparing coffee using said type of coffee machine and said type of grinder.

A coffee grinder with a grind size easy to adjust includes a cup lid, a coffee cup, a bean hopper and a lid body. The cup lid is arranged at the bottom of the coffee cup. The bean hopper is arranged at the top of the coffee cup. The lid body is arranged at the top of the bean hopper. A protruding tool-setting screw rod is arranged on a bottom surface of the lid body. The tool-setting screw rod extends into a driving disc base. A rotary rod is arranged in a tool-setting nut sleeve and has an end extending into a motor arranged in the tool-setting screw rod as well as an end extending into a bean hopper support. The coffee grinder is simple and reasonable in structural design and being provided with a structure for adjusting the size of ground coffee beans.

A coffee grinder with a grind size easy to adjust includes a cup lid, a coffee cup, a bean hopper and a lid body. The cup lid is arranged at the bottom of the coffee cup. The bean hopper is arranged at the top of the coffee cup. The lid body is arranged at the top of the bean hopper. A protruding tool-setting screw rod is arranged on a bottom surface of the lid body. The tool-setting screw rod extends into a driving disc base. A rotary rod is arranged in a tool-setting nut sleeve and has an end extending into a motor arranged in the tool-setting screw rod as well as an end extending into a bean hopper support. The coffee grinder is simple and reasonable in structural design and being provided with a structure for adjusting the size of ground coffee beans.

A coffee grinding machine is described, said machine comprising: a first burr; a motor configured to rotate the first burr about a rotation axis; a second burr configured to cooperate with the first burr for grinding coffee beans, wherein the second burr comprises a second surface which, preferably, extends substantially along the outer edge of the second burr, namely in the vicinity of the outer edge of the first burr; a grinder-holder body which can be locked to the second burr, wherein the grinder-holder body comprises a first surface at least partially facing the second surface and cooperating therewith, wherein either one of the first surface and the second surface is a spherical surface, wherein the other one of the first surface and the second surface is a spherical surface, and wherein the first surface and the second surface cooperate with each other so as to suitably orient the first burr with respect to the second burr, before locking the second burr to the grinder-holder body.

A coffee grinding machine is described, said machine comprising: a first burr; a motor configured to rotate the first burr about a rotation axis; a second burr configured to cooperate with the first burr for grinding coffee beans, wherein the second burr comprises a second surface which, preferably, extends substantially along the outer edge of the second burr, namely in the vicinity of the outer edge of the first burr; a grinder-holder body which can be locked to the second burr, wherein the grinder-holder body comprises a first surface at least partially facing the second surface and cooperating therewith, wherein either one of the first surface and the second surface is a spherical surface, wherein the other one of the first surface and the second surface is a spherical surface, and wherein the first surface and the second surface cooperate with each other so as to suitably orient the first burr with respect to the second burr, before locking the second burr to the grinder-holder body.

A coffee grinder device includes a tank of coffee beans, at least one grinding member adapted to grind a quantity of coffee beans to obtain a coffee powder, a grain size adjustment device adapted to adjust at least one operating parameter of the grinding member to vary the grain size of the coffee powder (7), and a dispensing opening adapted to deliver the coffee powder towards a container adapted to receive the coffee powder. The coffee grinder device also includes in correspondence with or downstream of the dispensing opening, an optical grain size sensor adapted to intercept the coffee powder exiting the dispensing opening and to generate at least a signal indicative of the grain size of the coffee powder. The grain size of the coffee powder is selectable by the grain size adjustment device on the basis of the signal indicative of the grain size of the coffee powder.

A coffee grinder device includes a tank of coffee beans, at least one grinding member adapted to grind a quantity of coffee beans to obtain a coffee powder, a grain size adjustment device adapted to adjust at least one operating parameter of the grinding member to vary the grain size of the coffee powder (7), and a dispensing opening adapted to deliver the coffee powder towards a container adapted to receive the coffee powder. The coffee grinder device also includes in correspondence with or downstream of the dispensing opening, an optical grain size sensor adapted to intercept the coffee powder exiting the dispensing opening and to generate at least a signal indicative of the grain size of the coffee powder. The grain size of the coffee powder is selectable by the grain size adjustment device on the basis of the signal indicative of the grain size of the coffee powder.