The invention relates to a grinder for grinding coffee beans. The grinder has a first grinding tool and a second grinding tool which form a grinding gap and are rotatable relative to each other to grind coffee beans in the gap. A force generation device is arranged for applying a force, which is adjustable during operation, to one or both of the first grinding tool and second grinding tool, which force is transferable to the coffee beans. The invention also relates to a method for grinding coffee beans with the grinder for preparing a hot beverage.

An adjuster 3 is attached to a barrel unit 1 to be rotatable relative to the barrel unit 1 and to be prevented from coming off the barrel unit 1 in an axis direction. A ground particle size for granular food is adjusted by rotating the adjuster 3. A means is provided that inscribes an outer mill unit 4 in the barrel unit 1 and the adjuster 3, and makes the outer mill unit 4 movable in the axis direction and makes the outer mill unit 4 attachable and detachable. A rotary shaft 6 extending from a rotary operation unit 2 extends downward along a mill. An inner mill unit 5 is attached to the rotary shaft 6. The adjuster 3 is provided with a movement restricting means 44 that restricts movement of the inner mill unit 5 to a predetermined position. Releasing the restriction imposed by the movement restricting means 44 makes the inner mill unit 5 and the outer mill unit 5 extractable.

An adjuster 3 is attached to a barrel unit 1 to be rotatable relative to the barrel unit 1 and to be prevented from coming off the barrel unit 1 in an axis direction. A ground particle size for granular food is adjusted by rotating the adjuster 3. A means is provided that inscribes an outer mill unit 4 in the barrel unit 1 and the adjuster 3, and makes the outer mill unit 4 movable in the axis direction and makes the outer mill unit 4 attachable and detachable. A rotary shaft 6 extending from a rotary operation unit 2 extends downward along a mill. An inner mill unit 5 is attached to the rotary shaft 6. The adjuster 3 is provided with a movement restricting means 44 that restricts movement of the inner mill unit 5 to a predetermined position. Releasing the restriction imposed by the movement restricting means 44 makes the inner mill unit 5 and the outer mill unit 5 extractable.

Coffee grinder for grinding coffee beans, comprising a container or supply element for coffee beans and a grinding device for grinding the coffee beans. The grinding device comprises a first and a second grinding element between which the coffee beans are ground, the distance between the two grinding elements in the grinding process determining the degree of grinding of the ground coffee, and at least one grinding element being driven by a motor. An adjusting element is provided, with which the distance between the two grinding elements can be adjusted by rotating an adjusting element, and a magnetic rotational position sensor, which directly or indirectly determines the absolute rotational position of this adjusting element as a measure of the distance and provides it for the further control of the coffee grinder.

A grinding device for grindable products includes movable and fixed grinding assemblies. The movable grinding assembly includes a rotationally integral casing and a grinder including a grinding cone with a grinding surface. The fixed grinding assembly includes a counter-grinder and a coupling member. The casing includes a cylindrical jacket and is closed at one end, including openings for dispensing a ground product. The counter-grinder has a hollow cylindrical body with an inner grinding surface. The grinder is inserted into the hollow cylindrical body of the counter-grinder to allow the respective grinding surfaces to cooperate. The coupling member includes an open ended cylindrical body connecting with the container and an adjustment portion cooperating with the casing for adjusting the movable grinding assembly with respect to the fixed grinding assembly. The grinder and the counter-grinder are substantially rigid, and the casing and the coupling member are substantially flexible.

A grinding device for grindable products includes movable and fixed grinding assemblies. The movable grinding assembly includes a rotationally integral casing and a grinder including a grinding cone with a grinding surface. The fixed grinding assembly includes a counter-grinder and a coupling member. The casing includes a cylindrical jacket and is closed at one end, including openings for dispensing a ground product. The counter-grinder has a hollow cylindrical body with an inner grinding surface. The grinder is inserted into the hollow cylindrical body of the counter-grinder to allow the respective grinding surfaces to cooperate. The coupling member includes an open ended cylindrical body connecting with the container and an adjustment portion cooperating with the casing for adjusting the movable grinding assembly with respect to the fixed grinding assembly. The grinder and the counter-grinder are substantially rigid, and the casing and the coupling member are substantially flexible.

A bean grinding device and a bean grinding coffee machine including the bean grinding device the bean grinding device includes a grinding assembly and an adjusting assembly; the grinding assembly includes a bean grinding chamber, an outer grinding wheel, and an inner grinding wheel; the outer grinding wheel and the inner grinding wheel are disposed inside the bean grinding chamber; the adjusting assembly includes at least two stages of adjusting mechanisms; the at least two stages of adjusting mechanisms includes a first adjusting mechanism and a second adjusting mechanism; the first adjusting mechanism and the bean grinding chamber are connected by means of a first track; the second adjusting mechanism and the outer grinding wheel are connected by means of a second track; and positions of the first adjusting mechanism and the second adjusting mechanism are relatively fixed in an axial direction.

A coffee grinder-doser includes a grinder-doser body enclosing a grinding chamber which houses first and second mills configured and mutually positioned to grind coffee beans into powder. An external ring-nut which is gripped and rotated by an operator integrally connects to the first mill. A nut screw with a longitudinal axis, inside the grinding chamber, is engaged with an external thread of the ring-nut to translate the first mill along the longitudinal axis. The ring-nut includes a ring-nut body and indices defining the angular position thereof. The grinder-doser body includes a fixed reference for the indices. The ring-nut is associated with a graduated ring having the indices, and a cover at least partially removable to lock the graduated ring between the cover and the ring-nut. The cover is fixed to the ring-nut body by a partially removable couple for adjusting and locking the angular position of the graduated ring.

A coffee grinder-doser includes a grinder-doser body enclosing a grinding chamber which houses first and second mills configured and mutually positioned to grind coffee beans into powder. An external ring-nut which is gripped and rotated by an operator integrally connects to the first mill. A nut screw with a longitudinal axis, inside the grinding chamber, is engaged with an external thread of the ring-nut to translate the first mill along the longitudinal axis. The ring-nut includes a ring-nut body and indices defining the angular position thereof. The grinder-doser body includes a fixed reference for the indices. The ring-nut is associated with a graduated ring having the indices, and a cover at least partially removable to lock the graduated ring between the cover and the ring-nut. The cover is fixed to the ring-nut body by a partially removable couple for adjusting and locking the angular position of the graduated ring.

A grinder has first and second body parts rotatable to each other. The first and second body parts engage the outer and inner burrs, respectively. A supporting flange in the second body part forms a seat to receive the outer burr. The outer burr is pressed toward the supporting flange to localize the outer burr against undesirable forces generated during grinding. A ring-shaped plate is sandwiched between the supporting flange and the outer burr. The outer burr presses on a bearing surface of the plate. The bearing surface is more resistant to abrasion than the supporting flange, advantageously reducing wear debris generation due to abrasion by the outer burr. Furthermore, a shaft engaging the inner burr is shaped as a triangular column for more effectively transmitting a received torque to the inner burr, allowing a plastic shaft to be used so as to reduce the manufacturing cost.