Coffee grinder with system for simplified opening and closing of grinding chamber

Abstract

A coffee grinder comprising a grinding chamber wherein the grinding chamber comprises a lower portion and an upper portion wherein the upper portion and the lower portion of the grinding chamber can be separated from each other wherein the grinding chamber is configured to assume a closed working position in which the upper portion is connected to the lower portion and an open position in which the upper portion is connected to the lower portion. The upper part is separated from the lower part, the lower part of the grinding chamber comprises a first grinding part, the upper part comprises a second grinding part, and the second grinding part is configured to cooperate with the first grinding part so as to grind coffee beans; wherein the upper part further comprises an adjusting mechanism, and the adjusting mechanism is configured to adjust the relative distance between the first grinding part and the second grinding part in the closed working position so as to change the fineness of the ground coffee; wherein, in the open position, the second grinding portion is connected to the upper portion of the grinding chamber and is separated from the first grinding portion, and wherein, in the closed working position, the upper portion and the lower portion are joined by a magnetic attraction force.

Description

Technical Field

[0001] The present invention relates to a machine for grinding coffee beans. The machine for grinding coffee beans can be a separate machine or can be incorporated in a machine for producing coffee-based beverages. Such a machine is also simply referred to as a "coffee grinder", "coffee mill" or "pulverizer".

[0002] More specifically, the present invention relates to the opening and closing of the grinding chamber. Even more specifically, the present invention relates to a mechanism that allows for a simplified opening (and closing) of the grinding chamber. Background Art

[0003] It is known that, in order to prepare espresso, a certain amount (commonly referred to as a "dose") of ground coffee is used. A dose can be a single dose, a double dose or a multiple dose. The dose of ground coffee is filled into a filter, which is usually in the form of a cup with an open top and micro-perforations at its bottom. Generally, a dose of coffee is pressed inside the filter in order to form a coffee puck. The filter is in turn supported by a filter holder configured to removably engage a dispensing unit of an espresso machine. Espresso is obtained by passing hot water under pressure through the coffee puck.

[0004] A coffee grinder is used to obtain ground coffee. In known coffee grinders, coffee beans are ground by passing them through a grinding member. Flat, conical or hybrid grinding members are known. Generally, the grinding member of a coffee grinder includes a fixed member and a member that rotates relative to the fixed member. For example, in a coffee grinder with flat burrs, one burr remains stationary while the other burr is rotated by a motor. Some coffee grinders are able to modify the distance between the grinding members in order to change the particle size of the ground coffee.

[0005] DE 202007016141 describes a coffee grinder having a housing and two grinding discs arranged opposite each other, wherein the engagement of the grinding discs with the flange of a fixed disc or with the flange of a rotor is carried out by means of magnets connected to the flange of the fixed disc or the rotor.

[0006] US 2012 / 0168544 describes a grinder for grinding tobacco leaves. Summary of the Invention

[0007] The Applicant has carefully studied known coffee grinders.

[0008] As is known, in known coffee grinders for domestic and professional use, it is desirable to be able to vary the distance between the grinding parts in an accurate, repeatable and stable manner. This function enables the particle size of the resulting coffee powder to be adjusted, thus obtaining a series of advantages.

[0009] For example, different particle sizes suitable for various types of extraction operations can be obtained, and the range of these different particle sizes extends from ultra-fine particle sizes to coarser particle sizes.

[0010] It is desirable that the user should be able to operate comfortably and feel a light movement when adjusting the particle size.

[0011] Moreover, it is desirable that the particle size adjustment operation should be simple and the set value should be relatively easy to read.

[0012] In order to obtain at least some of the above characteristics, it is necessary that the grinding parts forming the grinding chamber and all components should be rigid and very stable. At the same time, especially in the case of "on-demand" coffee grinders (i.e., machines that grind a pre-dosed quantity of coffee beans), it is necessary that the grinding chamber should be easily opened and at least some of the individual components should be separable from each other.

[0013] In order to view the wear state of the grinding parts and especially to be able to remove any coffee residues, it is necessary to open the grinding chamber.

[0014] By removing the coffee residues, the cleaning of the grinding chamber can generally be carried out. The cleaning of the grinding chamber and the grinding parts should be carried out regularly, but obviously it is advisable to do so before interrupting the use of the coffee grinder (even for a short period of time). In fact, coffee residues tend to oxidize easily and become putrid. If they are not removed, coffee residues may cause the formation of mold. Mold has a negative impact on the quality of the ground coffee, especially on the quality of the first ground doses of coffee.

[0015] In the case of grinding a preselected dose (especially a high-quality dose), it is necessary to remove the coffee residues to ensure that the entire quantity of coffee beans introduced into the machine can be collected in a ground form. This can be easily achieved with the help of a small brush after opening the grinding chamber.

[0016] More generally, when the type of coffee to be ground changes, it is highly advisable to remove the coffee residues.

[0017] Coffee grinders equipped with a system for opening the grinding chamber are known. To ensure rigidity, in many applications, one of the grinding parts can be removed with the aid of a tool such as a screwdriver or an Allen key to open the grinding chamber. The use of tools hinders the user from regularly opening the grinding chamber for cleaning and maintenance.

[0018] Therefore, the applicant has determined the objective of finding a reliable and advantageous solution for opening the grinding chamber in a safe and easy manner and closing the grinding chamber in a stable and reliable manner.

[0019] According to the applicant, the above objective and other objectives are achieved in a coffee grinder that includes a grinding chamber, the closure of which is ensured by magnetism, while on the other hand, the opening of the grinding chamber is performed by the user applying a force opposite to the magnetic closing force. Advantageously, according to some embodiments, no tool is required to open the grinding chamber.

[0020] The simplification of the way of opening the grinding chamber according to the present invention is very advantageous for the user, especially in that it also eliminates the need for tools. In this way, the cleaning cycle can be performed more frequently and without the help of a technician (especially in a household environment).

[0021] The present invention is applicable to any coffee grinder, especially a coffee grinder having a flat grinding part, a conical grinding part or a hybrid grinding part.

[0022] The applicant has noted that the solution described in DE 202007016141 does not solve the problem of facilitating the opening of the grinding chamber. In fact, the upper part and the lower part of its grinding chamber are joined together by threads.

[0023] In addition, the applicant has noted that in the solution described in DE 202007016141, whenever the grinding chamber is opened by unscrewing the upper part from the lower part, the fineness setting is lost. Therefore, when the upper part is screwed back onto the lower part of the grinding chamber, the fineness adjustment must be performed again. This operation is inconvenient and thus hinders the user from performing it frequently. Instead, the grinding chamber should be opened daily or, in any case, frequently in order to clean the coffee powder in the grinding part and thus prevent the coffee remaining between the grinding parts from becoming putrid.

[0024] According to a first aspect, the present invention provides a coffee grinder for grinding coffee beans, which includes a grinding chamber. The grinding chamber includes a lower part and an upper part, and the upper part and the lower part of the grinding chamber can be separated from each other. The grinding chamber is configured to adopt a closed working position and an open position. In the closed working position, the upper part is connected to the lower part, and in the open position, the upper part is separated from the lower part. The lower part of the grinding chamber includes a first grinding part, and the upper part includes a second grinding part, which is configured to cooperate with the first grinding part to grind coffee beans. The upper part further includes an adjustment mechanism, which adjusts the relative distance between the first grinding part and the second grinding part in the closed working position so as to change the fineness of the ground coffee. In the open position, the second grinding part is connected to the upper part of the grinding chamber and separated from the first grinding part. And in the closed working position, the upper part and the lower part are connected by magnetic attraction. Basically, the second grinding part is integral with the upper part of the grinding chamber, and when the upper part is separated from the lower part, the two grinding parts are separated. In this way, for example, using compressed air and / or a brush, the residual coffee in the grinding part can be cleaned separately and easily. Advantageously, the adjustment mechanism forms a part of the upper part of the grinding chamber. When the grinding chamber is opened and the grinding parts are separated from each other, the adjustment is also maintained. The adjustment mechanism is independent of the magnetic arrangement for closing the grinding chamber.

[0025] According to the present invention, the upper part and the lower part are not connected together by screws or bolts.

[0026] According to some embodiments, the lower part of the grinding chamber includes a single magnet or a plurality of magnets.

[0027] According to some embodiments, the single magnet or the plurality of magnets are arranged in the thickness of the lower part of the grinding chamber.

[0028] According to some embodiments, the upper part of the grinding chamber includes a single magnet or a plurality of magnets.

[0029] According to some embodiments, the magnets are in the form of pins and are preferably arranged at equal angular intervals.

[0030] According to some embodiments, the part of the grinding chamber opposite to the part including the magnets includes a body made of ferromagnetic material.

[0031] According to some embodiments, the first grinding part is mechanically connected to the lower part of the grinding chamber by screws or other threaded members.

[0032] According to some embodiments, the second grinding part is mechanically connected to the upper part of the grinding chamber by screws or other threaded members.

[0033] According to some embodiments, the second grinding part is integral with the threaded grinding part holder disk, and the adjusting device includes an annular nut.

[0034] According to some embodiments, the annular nut includes an inner annular nut and an outer annular nut. An adjusting thread is formed on the inner annular nut, and the outer annular nut serves as a gripping part for the operator to hold.

[0035] According to some embodiments, a sliding track is arranged between the lower part and the upper part.

[0036] According to some embodiments, positioning members are provided for coupling the lower part and the upper part together at a pre-defined position.

[0037] According to some embodiments, the positioning members include teeth protruding radially inwards from the inner circumference of the sliding track and corresponding notches in the grinding part holder disk or notches in the lower part of the grinding chamber and teeth on the grinding part holder disk.

[0038] According to some embodiments, the teeth are arranged at unequally spaced angles and / or have different shapes from each other and / or have different sizes from each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The following is a detailed description of the present invention, which is provided purely by way of non-limiting examples and is to be read with reference to the accompanying drawings, in which:

[0040] - Figure 1.1 is a schematic view of a coffee grinder according to an embodiment of the present invention;

[0041] - Figure 1.2 is Figure 1.1 a longitudinal sectional view of the machine shown in

[0042] - Figure 2 is a longitudinal sectional view of the grinding chamber at an enlarged scale according to an embodiment of the present invention;

[0043] - Figure 3 is a longitudinal sectional view of larger scale through the Figure 2 grinding chamber with the annular nut assembly uncoupled;

[0044] - Figure 4 shows a longitudinal sectional view of the removal of the fixing screw and the sliding plate;

[0045] - Figure 5 shows an axonometric view from above of the fixing screw and the sliding plate in the disassembled state;

[0046] - Figure 6 shows an axonometric view from below of the fixing screw and the sliding plate in the disassembled state;

[0047] - Figure 7 Shows a second embodiment of the grinding chamber, the closing of the grinding chamber being carried out by means of magnetic attraction;

[0048] - Figure 8 Is an exploded axonometric view of the lower part of the grinding chamber. Detailed Description of the Invention

[0049] Figure 1.1 and Figure 1.2 Shows a coffee grinder by way of example according to an embodiment of the present invention. Obviously, the coffee grinder according to the present invention can assume forms that are completely different from those shown, without thereby departing from the scope of protection of the present invention.

[0050] The machine 10 includes a machine body 12 that houses the main components, the main components including a grinding chamber 30 having a grinding section assembly 36. Generally speaking, the machine 10 includes a hopper 14 in its upper part. The hopper 14 is configured to hold the coffee beans to be ground and to allow the coffee beans to reach the grinding chamber 30 and the grinding section assembly 36.

[0051] The machine 10 also includes means for adjusting the fineness of the ground coffee. The adjusting means will be described more fully below.

[0052] The machine 10 also includes an outlet duct 16 for directing the ground coffee towards a filter 18, which in turn is supported by a filter holder 20. Advantageously, a support 22 can be provided for supporting the filter holder 20 during the filling of the filter 18 with ground coffee powder. The height of the support 22 is adjustable. In Figure 1.1 it is also possible to see the buttons 26 for operating the coffee grinder, as well as an LED (or display) for showing the condition of the machine 10.

[0053] Figure 1.2 Shows Figure 1.1 A longitudinal cross-section of the machine shown in

[0054] In addition to the components already mentioned, the grinding section assembly and an electric motor 24 for rotating one grinding section relative to the other are also shown. Figures 2 to 6 The grinding section assembly (and the grinding chamber 30 according to the first embodiment) is shown in more detail in the respective

[0055] The respective Figures 2 to 6 Shows a grinding chamber 30 having a grinding section assembly, the grinding section assembly in turn including a lower grinding section 361 and an upper grinding section 362. The grinding chamber 30 includes a lower part 31 and an upper part 32. The lower part 31 of the grinding chamber houses the lower grinding section 361. The upper part 32 of the grinding chamber includes the upper grinding section 362.

[0056] According to the illustrated embodiment, the lower grinding part 361 is a movable grinding part. It is movably connected to the motor shaft in any known manner. This connection can be carried out, for example, by means of a flanged grinding part holder disk 361 that rotatably supports the lower grinding part 361.

[0057] Advantageously, the flanged disk can be provided with a suitable radial profile that is designed to discharge the ground coffee leaving the grinding parts 361, 362 from the grinding chamber 30.

[0058] Obviously, in this description and the associated drawings, the axes A of the grinding parts 361, 362 are arranged along the vertical direction. However, the present invention is also applicable to coffee grinders having horizontal or inclined grinding part axes different from the vertical direction. In fact, as Figure 1.2 shown, the axis A of the grinding part is inclined with respect to the vertical direction. The grinding parts can also be arranged differently such that the grinding part is movable at the top or there are two movable grinding parts. Finally, as mentioned above, the present invention is also applicable to the case of conical grinding parts.

[0059] The upper grinding part 362 is aligned on the same axis A. The upper grinding part 362 is integral with the grinding part holder disk 4. The grinding part holder disk 4 is preferably rigidly connected to the upper grinding part 362, for example, by means of screws 41 ( Figure 7 ). The grinding part holder disk 4 includes a cylindrical outer surface and threads 42 on at least a part of the outer surface.

[0060] The internal adjusting ring nut 17 is arranged radially outside the grinding part holder disk 4. The internal adjusting ring nut 17 includes threads 172 that cooperate with the threads 42 of the grinding part holder disk 4.

[0061] The external adjusting ring nut 15 is arranged radially outside the internal ring nut 17. The external ring nut 15 can be at least partially made of a thermoplastic material and serves as a gripping portion for the operator to hold.

[0062] It will become clearer from reading the following that when the grinding chamber is closed, the grinding part holder disk 4 (and thus the upper grinding part 362 connected thereto) is configured to be non-rotatable relative to the lower part of the grinding chamber. Therefore, the rotation of the ring nut causes the displacement of the grinding part holder disk 4 and the upper grinding part 362. The axial displacement can occur in a first direction towards the lower grinding part or in a second direction away from the lower grinding part.

[0063] When the grinding chamber is opened, the preset adjustment is not lost, but when the grinding chamber is closed again, the preset adjustment remains unchanged. This is due to the fact that the grinding adjustment mechanism is independent of the way the upper part of the grinding chamber is coupled to the lower part of the grinding chamber.

[0064] The operator can rotate the outer annular nut 15 to increase / decrease the fineness of the ground coffee. The outer annular nut and the inner annular nut can be connected together by a toothed notch profile and separated by an axial sliding amount.

[0065] According to some embodiments of the present invention, the inner annular nut 17 is at least partially made of a ferromagnetic material.

[0066] According to an embodiment of the present invention, the inner annular nut 17 is substantially entirely made of a ferromagnetic material.

[0067] The ferromagnetic material can be selected from, for example, the group including iron, steel, nickel, cobalt, chromium, or any combination thereof. A spring 23 is provided. The spring 23 pushes the upper grinding part upward in the same direction as the thrust acting on the coffee during grinding. This is to eliminate the play in the adjusting thread. The spring 23 is installed in the upper seat 25 formed in the upper cap 27.

[0068] According to a first embodiment, at least one magnet 311 is provided, which is substantially integral with the lower part 31 of the grinding chamber. According to some embodiments, a plurality of magnets 311 are provided.

[0069] The magnet 311 can be in the form of, for example, a pin inserted into the wall of the lower part 31 of the grinding chamber 30. This solution is shown in Figures 2 to 6 The magnetic pins 311 can be in any number, such as 2, 3, 4, 5, or 6 (as in the specific example shown in the drawings). Each pin 311 is inserted into a hole 312 formed in the thickness of the wall of the lower part 31 of the grinding chamber 30.

[0070] According to some embodiments, the respective holes 312 are equally angularly spaced, but they can also be arranged differently.

[0071] According to some embodiments, a sliding track 38 can be arranged on the upper surface of the lower part 31 of the grinding chamber 30. The sliding track 38 can be, for example, directly formed in the grinding chamber, or made of a different material, preferably non-magnetic and having specific friction characteristics, such as bronze, brass, polymer, steel, and sintered materials that can be provided with an anti-wear and anti-friction coating.

[0072] The sliding track 38 is in the form of, for example, a circular edge and has a small thickness. The thickness can be, for example, equal to a few millimeters, such as 2 - 6 mm. In other embodiments, the sliding track can be absent because functionality can also be ensured when the sliding track is directly formed on the grinding chamber.

[0073] The sliding track 38 can be fixed to the top of the lower part of the grinding chamber by means of screws 381 which are inserted into corresponding through holes 382 in the sliding track 38 and corresponding blind holes 383 in the wall of the lower part 31 of the grinding chamber 30.

[0074] Advantageously, the heads of the magnetic pins 311 are substantially flush with the upper surface of the sliding track 38 as each of them passes through the through hole 313.

[0075] The sliding track 38 serves the purpose of facilitating the rotational sliding of the internal annular nut 17. Such a sliding movement may be necessary to ensure the fluidity of the grinding part and the accuracy of position adjustment. The sliding movement is also necessary to determine the axial position of the grinding part holder disc 4 and thus the grinding adjustment (the relative distance between the two grinding parts).

[0076] The predetermined position can be defined by positioning members present in the sliding track 38 and / or in the annular nut body 17 directly facing the sliding track 38. The predetermined position must be set between the sliding track 38 and the upper grinding part holder disc 4, for example by means of teeth and notches which will be described below.

[0077] The said radial connection ensures that the grinding part holder disc 4 does not rotate but is able to slide axially by the rotation of the external annular nut 15 via the thread 42 - 172.

[0078] The teeth can also form part of the grinding chamber 30.

[0079] As an example, the various figures show embodiments of the positioning members which include teeth 385 projecting radially inwards from the inner circumference of the sliding track 38 and corresponding notches 171 in the internal annular nut 17. One of the notches 171 is visible in Figure 6 Obviously, the same function can be performed by other positioning members and in any case the notches can be located on the sliding track (or in any case on the lower part of the grinding chamber) and the teeth can be located in the internal ring 17.

[0080] In this embodiment, the number of teeth 385 and notches 171 is three, but it can also consist of a smaller number (even one) or a larger number. In order to establish the unique relative position of the internal annular nut 17 and the sliding track 38 (which is in turn integral with the lower part 31 of the grinding chamber 30), the teeth 385 and notches 171 are spaced apart at unequal angles. In this way, there is substantially a unique position for connecting the annular nut body 17 to the grinding chamber. In order to find this unique connection position, it may be necessary to rotate either one relative to the other in a clockwise or counterclockwise direction.

[0081] Alternatively, the notch 171 (and similarly the tooth 385) may not have the same form and / or the same size.

[0082] Once the correct and stable coupling position is found, the inner annular nut 17 is locked relative to the lower part 31 of the grinding chamber 30 by the magnetic attraction between the magnet 311 and the annular nut body 17 made of ferromagnetic material.

[0083] The number of magnets 311 and their diameters are dimensioned such as to provide an attractive force sufficient to ensure a stable and reliable coupling.

[0084] To open the grinding chamber, the user must overcome the magnetic attraction between the magnet 311 and the inner annular nut 17 made of ferromagnetic material and simply raise the upper part, i.e., the inner annular nut 17 (together with the outer annular nut 15, the upper grinding part 362 and the grinding part retaining disk 4). To perform the opening, the user does not have to use any tools (such as a screwdriver, a wrench or an Allen key). Since the upper grinding part is integral with the upper part of the grinding chamber, by raising the upper part of the grinding chamber, the grinding parts are separated from each other: the lower grinding part will remain together with a part of the lower chamber, and the upper grinding part will be substantially integral with the upper part of the grinding chamber. In this way, the two grinding parts can be cleaned and inspected separately.

[0085] Advantageously, the upper chamber will maintain the grinding fineness adjustment. In other words, when the upper part of the grinding chamber is coupled again with the lower part, the relative distance between the grinding parts will be maintained as the relative distance before the grinding chamber was opened. This represents a great advantage as it does not hinder the opening of the grinding chamber (which is usually done for cleaning purposes).

[0086] Obviously, although in this description the magnet is described as fixed to the lower part of the grinding chamber and the body made of ferromagnetic material is described as being in the top part (inner annular nut), the opposite is also possible, i.e., the magnet is in the upper part and the ferromagnetic material is in the lower part, or a combination of the two solutions is possible.

[0087] Advantageously, an air gap can be provided between the magnet and the ferromagnetic material. The air gap is indicated by t in Figure 2 .

[0088] The present invention ensures a perfect relative alignment positioning of the two grinding parts during the working phase.

[0089] Furthermore, an optimal stability of the annular nut in the set adjustment position is provided, ensuring stability during grinding.

[0090] Furthermore, by appropriately adjusting the attractive force and the coefficient of friction acting on the sliding track, the optimal sliding action of the annular nut and the fluid movement are ensured.

[0091] Figure 7 and Figure 8 shows another embodiment of the present invention. 31A indicates a bell-shaped member for supporting the motor assembly, which is not made of a metallic material. For example, it can be made of a thermoplastic material. It substantially lines the lower part of the grinding chamber. A seat for the magnet 311 is formed thereon.

[0092] 31B represents the lower part of the grinding chamber. Considering that it is surrounded by a wall integral with the bell-shaped member 31A, the wall of the lower part of the grinding chamber can be relatively thin. For example, it can be a metal (such as made of stainless steel) having a thickness of a few millimeters, for example 2 mm.

[0093] 31C represents the base of the grinding chamber made of stainless steel. This second embodiment shows that the magnet can also not be arranged in the thickness of the lower part of the grinding chamber, but can also be integral with the wall outside the actual grinding chamber.

[0094] For the purposes of the present invention, the "wall of the lower part of the grinding chamber" will be a single wall (such as made of a metallic material such as stainless steel) or a multi-layer wall (such as having an inner layer and an outer layer). The multi-layer wall can include layers made of different materials.

[0095] Obviously, compared with the solution described in DE 202007016141, the present invention has achieved significant improvements. Specifically, the adjusting device is integral with the upper part of the grinding chamber and is configured to maintain the grinding setting even when the upper part of the grinding chamber is separated from the lower part.

[0096] Furthermore, according to the present invention, the grinding part can be made of any material, such as stainless steel, ceramic material, etc.

Claims

1. A coffee grinder (10) for grinding coffee beans, comprising a grinding chamber (30), wherein, the grinding chamber (30) comprises a lower part (31) and an upper part (32), wherein the upper part (32) and the lower part (31) of the grinding chamber (30) are separable from each other, wherein the grinding chamber (30) is configured to assume a closed working position and an open position, in the closed working position, the upper part is connected to the lower part, and in the open position, the upper part is separated from the lower part, wherein the lower part (31) of the grinding chamber (30) comprises a first grinding part (361), wherein the upper part (32) comprises a second grinding part (362), which is configured to cooperate with the first grinding part (361) to grind coffee beans; wherein the upper part (32) further comprises an adjusting mechanism (15, 17, 4), which is configured to adjust the relative distance between the first grinding part (361) and the second grinding part (362) in the closed working position, so as to change the fineness of the ground coffee; wherein, in the open position, the second grinding part (362) is connected to the upper part (32) of the grinding chamber and is separated from the first grinding part (361), and wherein the upper part (32) and the lower part (31) are connected by magnetic attraction force in the closed working position.

2. The coffee grinder (10) according to claim 1, wherein, the lower part (31) of the grinding chamber (30) comprises a single magnet or a plurality of magnets (311).

3. The coffee grinder (10) according to claim 2, wherein, the single magnet or the plurality of magnets (311) are arranged in the thickness of the lower part (31) of the grinding chamber (30).

4. The coffee grinder (10) according to claim 1, wherein, the upper part (32) of the grinding chamber (30) comprises a single magnet or a plurality of magnets (311).

5. The coffee grinder (10) according to claim 2, 3 or 4, wherein, the magnets (311) are in the form of pins and are preferably arranged at equal angular intervals.

6. The coffee grinder (10) according to any one of the preceding claims, wherein, the part (32; 31) of the grinding chamber opposite to the part including the magnet comprises a body made of ferromagnetic material.

7. The coffee grinder (10) according to any one of the preceding claims, wherein, the first grinding part (361) is mechanically connected to the lower part (31) of the grinding chamber by screws or other threaded members.

8. The coffee grinder (10) according to any one of the preceding claims, wherein, the second grinding part (362) is mechanically connected to the upper part (32) of the grinding chamber by screws or other threaded members.

9. The coffee grinder according to any one of the preceding claims, wherein, The second grinding part (362) is integral with the threaded grinding part holder disk (4), and wherein the adjusting device includes an annular nut (15, 17).

10. The coffee grinder according to claim 9, wherein, the annular nut includes an inner annular nut (17) and an outer annular nut (15), an adjusting thread (172) is formed on the inner annular nut, and the outer annular nut serves as a gripping part for the operator to hold.

11. The coffee grinder (10) according to any one of the preceding claims, wherein, a sliding track (38) is provided between the lower part (31) and the upper part (32).

12. The coffee grinder (10) according to claim 11, wherein, positioning members (385, 171) are provided for connecting the lower part (31) and the upper part (32) together at a predetermined position.

13. The coffee grinder (10) according to claim 12, wherein, the positioning members (385, 171) include: teeth (385) radially protruding inwards from the inner circumference of the sliding track (38) and corresponding notches (171) in the grinding part holder disk (4), or notches (171) on the lower part of the grinding chamber and teeth (385) on the grinding part holder disk (4).

14. The coffee grinder (10) according to claim 13, wherein, the teeth (385) are arranged at unequal angular intervals and / or the teeth have different shapes from each other and / or the teeth have different sizes from each other.

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