Disclosed in the present invention is a high-precision externally-adjustable coffee grinder, including a main housing, a lifting rod, a grinding assembly and a coarseness adjusting structure, where the coarseness adjusting structure includes an external adjusting ring, an internal driving ring, a transmission gear; the external adjusting ring is sleeved and rotates relative to the main housing; the external adjusting ring is engaged with the internal driving ring through the transmission gear; and the external adjusting ring drives the internal driving ring to rotate to drive the lifting rod to adjust a grinding disc gap. The adjusting precision of the adjusting structure is greatly improved, the advantages of convenient adjustment of the externally-adjustable coffee grinder and clear scale indication of a one-turn coffee grinder are retained, and the problem of low precision of the one-turn adjusting coffee grinder in the prior art is solved.

Disclosed in the present invention is a high-precision externally-adjustable coffee grinder, including a main housing, a lifting rod, a grinding assembly and a coarseness adjusting structure, where the coarseness adjusting structure includes an external adjusting ring, an internal driving ring, a transmission gear; the external adjusting ring is sleeved and rotates relative to the main housing; the external adjusting ring is engaged with the internal driving ring through the transmission gear; and the external adjusting ring drives the internal driving ring to rotate to drive the lifting rod to adjust a grinding disc gap. The adjusting precision of the adjusting structure is greatly improved, the advantages of convenient adjustment of the externally-adjustable coffee grinder and clear scale indication of a one-turn coffee grinder are retained, and the problem of low precision of the one-turn adjusting coffee grinder in the prior art is solved.

A grinding device comprises a grinding housing with mutually co-acting grinding bodies. A lower of the two grinding bodies is both driven and axially adjustable for the purpose of setting a grind size. An upper grinding body is removable. A grind size of the grinding device can be adjusted in absolute manner between a first extreme position and a second extreme position, corresponding to a fixed setting range between a minimal clearance between the two grinding surfaces and a maximum clearance between the two grinding surfaces. An extreme position of the adjustable grinding body is imposed by a stop which is encountered by the adjusting means in the relevant extreme position. A coffee machine uses the absolute grind size and/or a fine-tuning for an optimal contact time between coffee and through-flowing water.

A grinding device comprises a grinding housing with mutually co-acting grinding bodies. A lower of the two grinding bodies is both driven and axially adjustable for the purpose of setting a grind size. An upper grinding body is removable. A grind size of the grinding device can be adjusted in absolute manner between a first extreme position and a second extreme position, corresponding to a fixed setting range between a minimal clearance between the two grinding surfaces and a maximum clearance between the two grinding surfaces. An extreme position of the adjustable grinding body is imposed by a stop which is encountered by the adjusting means in the relevant extreme position. A coffee machine uses the absolute grind size and/or a fine-tuning for an optimal contact time between coffee and through-flowing water.

There is disclosed a coffee grinding machine for grinding coffee beans and forming a dose of ground coffee directly in a filter basket with a bottom layer of ground coffee having a first mean particle size and an adjacent layer of ground coffee having a second mean particle size, comprising: grinding members for grinding coffee beans, an electric motor for causing rotation of at least one grinding member with respect to another grinding member, and a device configured to cause, during grinding of coffee beans for forming dose, a variation of rotation speed of said electric motor between a first speed and a second speed, wherein either said second mean particle size is smaller than said first mean particle size and said first speed is greater than said second speed or said second mean particle size is greater than said first mean particle size and said first speed is lower than said second speed.

There is disclosed a coffee grinding machine for grinding coffee beans and forming a dose of ground coffee directly in a filter basket with a bottom layer of ground coffee having a first mean particle size and an adjacent layer of ground coffee having a second mean particle size, comprising: grinding members for grinding coffee beans, an electric motor for causing rotation of at least one grinding member with respect to another grinding member, and a device configured to cause, during grinding of coffee beans for forming dose, a variation of rotation speed of said electric motor between a first speed and a second speed, wherein either said second mean particle size is smaller than said first mean particle size and said first speed is greater than said second speed or said second mean particle size is greater than said first mean particle size and said first speed is lower than said second speed.

Disclosed is a manual coffee grinder machine for domestic use, of the compact and portable type, having a central body which integrates a hermetically sealed bean reservoir and is joined to a container for the ground powder, which is provided with a quick release clutch with magnets. The grinding unit acts on a horizontal rotation axis, with large-sized flat vertical grinders and an external actuating lever which is located on a side, with respect to the central body, so as to facilitate the introduction of the beans and improve stability during the grinding phase. The lever can be integrated in a retracted way with a snap overturning mechanism. The constructive configuration of the grinder machine optimizes the quality of grinding and the manual actuation, and it also improves the preservation of coffee and offers high efficiency and ease of use.

Disclosed is a manual coffee grinder machine for domestic use, of the compact and portable type, having a central body which integrates a hermetically sealed bean reservoir and is joined to a container for the ground powder, which is provided with a quick release clutch with magnets. The grinding unit acts on a horizontal rotation axis, with large-sized flat vertical grinders and an external actuating lever which is located on a side, with respect to the central body, so as to facilitate the introduction of the beans and improve stability during the grinding phase. The lever can be integrated in a retracted way with a snap overturning mechanism. The constructive configuration of the grinder machine optimizes the quality of grinding and the manual actuation, and it also improves the preservation of coffee and offers high efficiency and ease of use.

Various illustrative systems, devices, and methods for espresso machines are provided. In general, an espresso machine is configured to brew and dispense espresso. In an exemplary implementation, the espresso machine includes a grinder configured to grind coffee beans. The grinder is configured to be adjustable to allow for adjustment of coffee bean grind size, which may help that ensure that a particular beverage brewed and dispensed by the espresso machine is prepared using an optimal grind size. The espresso machine is configured to prevent jamming of the grinder automatically in response to grind size adjustment.

Various illustrative systems, devices, and methods for espresso machines are provided. In general, an espresso machine is configured to brew and dispense espresso. In an exemplary implementation, the espresso machine includes a grinder configured to grind coffee beans. The grinder is configured to be adjustable to allow for adjustment of coffee bean grind size, which may help that ensure that a particular beverage brewed and dispensed by the espresso machine is prepared using an optimal grind size. The espresso machine is configured to prevent jamming of the grinder automatically in response to grind size adjustment.