COFFEE GRINDER FOR GRINDING AND FILLING WITH POWDERED COFFEE A FILTER TO BE CONNECTED TO A MACHINE FOR DISPENSING COFFEE IN THE CUP

Description

Patent Description for Industrial Invention entitled: “COFFEE GRINDER FOR GRINDING AND FILLING WITH COFFEE POWDER OF A FILTER TO BE CONNECTED TO A MACHINE FOR BREWING COFFEE IN “CUP”. On behalf of: AMBRODESIGN SAS DI MARCO AMBROSINI & C., a company incorporated and existing under Italian law, having its headquarters in 37137 VERONA (VR). Designated Inventor: AMBROSINI Marco. DESCRIPTION The present invention relates to a coffee grinder for grinding and filling a filter with ground coffee to be connected to a machine for dispensing coffee into a cup. It is known, particularly but not exclusively in the field of catering, the problem of preparing coffee with coffee machines espresso coffee. For this purpose, an operator prepares the necessary dose of coffee to be inserted into a filter, in turn housed in a filter holder, then inserts the filter holder in the machine in order to dispense the coffee into the cup and serve the product to the customer. The dose of coffee to be inserted into the filter is usually single or double; the dose single dose is intended to fill a single cup of coffee, the double dose instead it allows you to fill two cups of coffee. In this regard, espresso machines, especially those with professional use for bars and restaurants, they are usually equipped with two filter holder, of which: - a first filter holder contains a filter with a reduced volume, which is precisely sized to hold a single dose of ground coffee, and is equipped with a single dispensing spout, used to direct the freshly brewed espresso coffee directly in a single cup below; - a second filter holder contains a filter with increased volume, which is precisely sized to hold two doses of ground coffee, and it is equipped with a double dispensing spout, used to direct the freshly brewed espresso coffee directly into two cups below. For the preparation of ground coffee to be introduced into the filter holders it is known the use of coffee grinders that allow you to obtain coffee powder from from coffee beans. A first type of coffee grinder includes a grinding group that grinds a large amount of coffee beans and conveys the coffee powder thus obtained in a collection tank, from which the operator takes the desired amount of coffee powder and press it into the filter through a manual operation or through an electric press remote. This type of coffee grinder, however, has the disadvantage that the powder of coffee that is not immediately used by the operator remains inside the tank and can remain in contact with the air for long periods periods of time, which causes surface oxidation and loss, at least partially, of its characteristic aroma, compromising drastically the flavor and other organoleptic properties of the drink once dispensed into the cup. To at least partially overcome these drawbacks, a second method is known type of coffee grinder, so-called “on-demand”, which are devoid of the collection tank in which the coffee powder accumulates and in which the grinding of the coffee beans takes place only at the desired time by the operator and for a pre-established time, so as to grind a quantity of coffee beans corresponding to the single dose or double dose to be deliver at the moment. An example of an “on-demand” coffee grinder is shown in the document patent WO2024069472A1 in which, by means of a grinding group, the pre-set quantity of coffee beans is ground, the filter is filled and the relative filter holder with the corresponding quantity of ground coffee and, through a presser incorporated in the coffee grinder, the coffee is also pressed inside the filter automatically. This type of coffee grinder also includes a grinding device automatic activation (e.g. a push-button activator, a trigger activator electrical contact, a photocell activator) capable of activating automatically the grinding group when the filter and its filter holders are placed in a pre-established position. This way the grinder is able to detect whether the filter and the filter holders are correctly placed on board the appliance before to start grinding the coffee. However, this type of coffee grinder is also susceptible to improvements aimed at improving its ease of use. In this regard, it is emphasized that even if the device automatic activation is able to detect the presence of the filter holder edge of the equipment, it is not able to distinguish whether the filter holder is configured to hold a single dose of coffee or a double dose and this information must be set manually by the operator (for example via a button or other selector). It is easy to understand that, in case of human error in the setting of the coffee grinder, you run the risk of loading the filter holder and its filter with the wrong amount of ground coffee, sometimes compromising irremediably the subsequent preparation of the coffee in the cup. To at least partially overcome these drawbacks, it is known a further type of coffee grinder equipped with a recognition system automatic one-dose filter holder and two-dose filter holder and that consists of: - a pair of collars, which are mounted on the filter holders and which are equipped with a small electronic recognition device (e.g. example an RFID tag) containing information regarding the number of doses for which the relevant filter holder is configured (i.e. if it is a single-dose or double-dose filter holder); - an electronic detector (e.g. an RFID reader), mounted on board of the coffee grinder and set up to detect the electronic device recognition and the related information on the number of doses. In this way, the grinder not only detects that the filter holder is correctly mounted on board, but also how many doses of coffee must be be dispensed and loaded into the relevant filter. However, even this last type of known coffee grinder is not free from drawbacks, among which the fact that the collars and the corresponding electronic detector have manufacturing costs not negligible, which are inevitably passed on to the selling price coffee grinder public, with the risk of making the final product less interesting for customers. In addition to this, like all electronic devices, the devices also electronic recognition devices mounted on collars are particularly delicate and it is best not to put them in contact with water or subject them to strong temperature changes; therefore, when washed in the dishwasher together with related filter holders, the collars could become irreparably damaged and become totally useless. To overcome this problem it is possible to remove the collars before wash the filter holders and reassemble them once the washing is finished, but it's easy understand that these operations, especially for operators in the sector of catering, are rather laborious and inconvenient, since they have to be repeated manually at least once, if not several times, in course of the day. In this regard, it cannot be overlooked that the collars mounted on the filter holder can easily act as a collection area for dirt, with risk of dirtying the filter holders more, of increasing their load bacterial and inconveniently require a higher number of cleaning and washing interventions. The main task of the present invention is to devise a coffee grinder for grinding and filling with ground coffee of a filter to be connected to a machine for dispensing coffee into a cup allows you to load the filter holders with the correct amount of ground coffee in practical, easy and functional way and which, at the same time, has a cost extremely low-key. A further aim of the present invention is to devise a coffee grinder for grinding and filling a filter with ground coffee connect to a coffee machine that does not causes accumulation of dirt and allows for easy washing of the relevant filter holders and use them in conditions of maximum hygiene. Another purpose of the present invention is to devise a coffee grinder for grinding and filling a filter with ground coffee connect to a coffee machine that allows you to dispense coffee into a cup to overcome the aforementioned drawbacks of the prior art within the scope of a simple and rational solution, as well as easy and effective to use. The above mentioned purposes are achieved by this coffee grinder for the grinding and filling with ground coffee a filter to be connected to a machine for dispensing coffee into a cup having the features of claim 1. Other features and advantages of the present invention will be found more evident from the description of a form of execution preferred, but not exclusive, of a coffee grinder for grinding and filling a filter with ground coffee to be connected to a machine for dispensing coffee into a cup, illustrated for illustrative purposes only, but not limiting, in the attached tables of drawings in which: Figure 1 is an axonometric view of the coffee grinder according to the invention; Figure 2 is a sectional view of the coffee grinder according to the invention during the grinding phase of the coffee beans; Figure 3 is a sectional view of the coffee grinder according to the invention during the coffee powder pressing phase; Figure 4 is an axonometric view of a detail of the coffee grinder according to the invention; Figure 5 is a sectional view of the detail of Figure 4; Figures 6 to 8 are axonometric views illustrating the operation of the detail of figure 4 in combination with a first filter holder; Figures 9 to 11 are axonometric views illustrating the operation of the particular of figure 4 in combination with a second filter holder. With particular reference to these figures, a globally indicated 1 has been indicated coffee grinder for grinding and filling with ground coffee of a filter to be connected to a machine for dispensing coffee into the cup. Coffee grinder 1, in particular, is intended for grinding coffee beans or coffee in grains G (visible in figures 1 to 3) and fill with coffee powder or ground coffee P (visible in figure 3) a first filter holder 2 and a second filter holder 3, which in turn are intended to be mounted on a coffee machine that allows you to prepare and dispense coffee into a cup. In the embodiment shown in the figures, the first filter holder 2 and the second filter holder 3 are known in themselves and have a conformation classic which will be briefly described below. The first filter holder 2 is configured to hold a single dose of coffee and has a first portion 4 with a characteristic first shape. In more detail, the first filter holder 2 comprises a first handle of handle 5, which carries a first cup-shaped element 6, which houses a first filter 7 with reduced volume and, precisely, sized for contain a single dose of ground coffee P. The first cup element 6 and the first filter 7 have a conformation substantially axisymmetric with a first central axis of symmetry A1 which, in use, is intended to remain substantially vertical. Advantageously, the first filter holder 2 is also equipped with a first body of connection 8, which is placed under the first cup element 6 in correspondence of the first central symmetry axis A1, and a single dispensing spout 9, which extends from the first connecting body 8 towards right or left with respect to the first handle 5; in the embodiment shown in the figures, the single dispensing spout 9 extends to the right of the first grip handle 5 but, as certainly known to any expert in the sector, they are also common first filter holders 2 equipped with a single dispensing spout 9 oriented towards the left of the first grip handle 5. When the first filter holder 2 is mounted on the coffee machine, the single dispensing spout 9 allows you to direct the espresso coffee freshly prepared directly in a single cup. The second filter holder 3, instead, is configured to contain a double dose of coffee and has a second portion 10 with a second shape characteristic different from the first characteristic form. In more detail, the second filter holder 3 includes a second handle of handle 11, which carries a second cup-shaped element 12, which houses a second 13 filter with increased volume and, precisely, sized to hold two doses of ground coffee P. The second cup element 12 and the second filter 13 have a conformation substantially axisymmetric with a second axis of symmetry A2 power plant which, in use, is intended to remain substantially vertical. Advantageously, the second filter holder 3 is also equipped with a second connecting body 14, which is placed under the second cup element 12 in correspondence with the second central symmetry axis A2, and a double dispensing spout 15, which extends from the second connecting body 14 towards the second grip handle 11 and ends in two ends open, one on the right and one on the left with respect to the second handle of handle 11. When the second filter holder 3 is mounted on the coffee machine, the double dispensing spout 15 allows you to direct the espresso coffee freshly prepared directly into two cups. It is easy to notice that the single spout 9 and the double spout of dispensing nozzle 15 have different shapes; the single dispensing nozzle 9 is placed on the first filter holder 2 in a more advanced position (i.e. more far from the first handle 5) with respect to the position of the double dispensing spout 15 which, in fact, is placed on the second filter holder 3 in a rearward position (i.e. closer to the second handle of handle 11). As will be better described below, this difference in form between the single spout 9 and double spout 15 is exploited by the present invention to recognize which of the two filter holders 2, 3 is configured to hold a dose of coffee and which of the two filter holders 2, 3 is configured to hold two doses of coffee; in other words, in the embodiment shown in the figures the first portion 4 having the first characteristic shape of the first filter holder 2 coincides with the single dispensing spout 9, while the second portion 10 having the second characteristic shape of the second filter holder 3 coincides with the double spout of delivery 15. However, alternative forms of implementation of this provision are not excluded. invention in which the filter holders 2, 3 have different characteristic shapes from the dispensing spouts 9, 15 and the coffee grinder 1 is able to recognize such characteristic shapes regardless of the shape of the beaks of delivery 9, 15. In particular, the coffee grinder 1 comprises - at least one support frame 16; - at least one grinding group 17 associated with the support frame 16 and configured to grind coffee beans G and obtain the powder coffee P; - at least one coffee powder discharge area 18 P, arranged below the grinding group 17 and configured to receive, alternatively: - the first filter holder 2 which, as mentioned, is configured to contain a single dose of coffee and has the first portion 4 with the first characteristic shape; and - the second filter holder 3 which, as mentioned, is configured to contain a double dose of coffee and has the second portion 10 with the second characteristic form different from the first characteristic form; - electromechanical detection means 19 associated with the support frame 16 and configured to detect which of the first filter holder 2 and the second filter holder 3 is placed in the discharge area 18, the detection means electromechanical 19 including sensing means 20 arranged in proximity to the discharge area 18 and capable of coming into contact with at least one between the first portion 4 and the second portion 10 when the filter holders 2, 3 are placed in the discharge area 18. The support frame 16, for example, is configured to rest on a support surface, such as the counter of a bar or restaurant. Advantageously, the support frame 16 comprises a base 21 from which it a support column 22 stands. At the upper end of the support column 22 is mounted, usefully, a hopper 23 in which the coffee beans G are loaded first to be ground. Usefully, the grinding group 17 is arranged below the hopper 23 and in communication with it, so as to receive the coffee beans G directly from the hopper 23 to grind them. Advantageously, the grinding group 17 comprises a first millstone 24 and a second millstone 25 placed opposite each other, in which at least one of the millstones 24, 25 is rotating around a vertical axis Z by means of of a first engine 26. In the particular embodiment shown in the figures, the first millstone 24 is fixed while the second millstone 25 is movable via the first motor 26; for this reason in the continuation of this discussion the first mill 24 and the second mill 25 can also be called respectively fixed mill 24 and mobile mill 25. However, alternative forms of implementation are not excluded in which both millstones 24 and 25 are movable, for example counter-rotating (i.e. a rotating one clockwise and the other rotating counterclockwise). The grinding group 17 is configured to grind the coffees into powder G grains according to a grain size set by the operator. This pre-setting of the grain size occurs, for example, by means of adjusting the distance of the fixed millstone 24 from the mobile millstone 25 for by means of a ring nut 27, inside which the fixed millstone 24 is fixed; by turning manually the ring 27 so as to bring the fixed grinder 24 closer to the mobile grinder 25 you get a coffee powder P with a larger grain size end and vice versa. Usefully, the coffee grinder 1 comprises a first casing 28 and a second 29 crankcases of tubular shape and substantially coaxial to the axis vertical Z. The first crankcase 28 is associated with the support frame 16; in particular, the first crankcase 28 comprises an external lateral surface which, advantageously, it is associated with the support column 22. The second crankcase 29, instead, is placed inside the first crankcase 28; first crankcase 28 and the second crankcase 29 are spaced from each other by a interspace that defines an annular chamber 30 suitable for receiving the powder coffee P ground by the grinding group 17 and conveyed towards the down until reaching the filter holder 2, 3 located in correspondence with the unloading area 18. The first crankcase 19, for example, has the shape of a tube that ends in a lower conical section, which acts as a funnel to concentrate the coffee powder P falling along the annular chamber 30 towards the area of drain 18 and the filter holder 2, 3 housed therein. At the lower section of the first crankcase 28 a gasket 31 which, advantageously, is configured to come into contact with filter holders 2, 3 (in particular with one edge of the cup elements 6, 12) and avoid accidental spilling of coffee powder P outside the coffee grinder 1. Similar to the first crankcase 28, the second crankcase 29 also has, for example, the shape of a tube that ends in a conical lower section. Usefully the second crankcase 29 encloses the first engine 26; in particular, the first engine 26 is placed inside the second crankcase 29 below the millstones 24, 25, which millstones 24, 25 are placed in corresponding to the top of the second casing 29, on the outside of it. Advantageously, the coffee grinder 1 also comprises actuator means 32 arranged inside the second casing 29 and capable of moving a presser 33 along the vertical Z axis at the bottom of the chamber ring finger 30. The presser 33 is configured to press the coffee powder P collected in the filter 7, 13, as can be seen in figure 3, and, for this purpose, it is useful located at the bottom of the second crankcase 29, near of the unloading area 18. In this regard, it should be noted that the filter holder 2, 3 located in the area of discharge 18 represents the arrival point of the ground coffee powder P; starting from the grinding group 17, in fact, the coffee powder P is conveyed along the annular chamber 30 as it descends by gravity, is deviated from the lower conical section of the first crankcase 28, following the towards the arrows F as seen in figure 2, and is collected inside of the filter holder 2, 3 below. In this way, by grinding, a thick filling is created. uniform amount of coffee powder P in the filter 7, 13 which, following pressing by means of the presser 33, it is distributed uniformly inside of the entire filter volume 7, 13. Conveniently, the actuator means 32 comprises a second motor 34 upon operation of a linear actuator 35 connected to the pressure device 33. By way of example and not limited to, the linear actuator 35 may be a cam or a worm screw. Advantageously the millstones 24, 25, the first motor 26, the actuator means 32, the presser 33 and the discharge zone 18 are aligned with each other along the axis vertical Z, with the millstones 24, 25 arranged on top, the first engine 26 arranged under the millstones 24, 25, the actuator means 32 arranged under the first motor 26, the presser 33 arranged under the actuator means 32 and the discharge area 18 located under the presser 33. As mentioned, the discharge area 18 is configured to receive alternatively the filter holders 2, 3; this means that in the discharge area 18 both filter holders 2, 3 can be placed and housed, but clearly always and only one at a time. Usefully, the discharge area 18 includes a guide section 36, 37 adapted to guide the filter holders 2, 3 along a guiding direction D substantially horizontal. In practice, the operator is required to manually grip the handles of handle 5, 11 of the filter holders 2, 3 and couple them with the section of guide 36, 37, sliding them along the guide direction D, until place them just below the bottom of the annular chamber 30. The guide section 36, 37 comprises, for example, a plate 36 equipped with a horizontal slot 37 which defines the driving direction D; the slot 37 has a width sized to match a width of the connecting bodies 8, 14, so that the filter holders 2, 3 can be coupled to the guide section 36, 37 in a mating configuration where: - the connecting bodies 8, 14 are placed inside the slot 37; - the cup elements 6, 12 are placed above the plate 36; and - the dispensing spouts 9, 15 are located under the plate 36. Advantageously, electromechanical detection means 19 include at least one confirmation button 38 located in proximity of the discharge area 18 and capable of coming into contact with the first filter holder 2 and with the second filter holder when the filter holders 2, 3 are placed in the unloading area 18. In particular, the confirmation button 38 comes into contact with both filter holder 2, 3. In this regard, it should be noted that the first filter holder 2 has a first section 39 with a first specific shape and the second filter holder 3 has a second section 40 with a second specific form, in which the first specific form and the second specific form are substantially equal to each other; in the context in this discussion, the expression “substantially the same” means that the first section 39 and the second section 40 are perfectly identical or that are identical except for small differences which, in any case, do not hinder the activation of the confirmation button 38. In practice, the confirmation button 38 is configured to contact with sections 39, 40 of filter holders 2, 3 which have substantially the same specific shape; this means that regardless of which filter holder 2, 3 is placed in the discharge area 18, the confirmation button 38 is it still detects the presence. In the particular embodiment shown in the figures, the first section 39 coincides with the first connecting body 8 while the second section 40 coincides with the second connecting body 14; this means that the button of confirmation 38 is arranged so as to come into contact with the bodies of connection 8, 14 which, for this purpose, have substantially the same shape. However, alternative forms of implementation of this provision are not excluded. invention in which the sections 39, 40 which have the same specific shape correspond to parts of the filter holders 2, 3 other than the connection bodies 8, 14, for example correspond to the cup-shaped elements 6, 12 which, as can be seen from the figures, they have substantially the same shape. Usefully, the confirmation button 38 is movable along one direction substantially parallel to the driving direction D; in this way, the confirmation button 38 is automatically pressed / squeezed when the filter holders 2, 3 are inserted along the guide section 36, 37. Advantageously, the touch probes 20 comprise at least one button of selection 42, 43 configured for: - come into contact with one of the first portions 4 and the second portion 10 of the filter holders 2, 3 when the respective filter holder 2, 3 is placed in the discharge area 18; and - do not come into contact with the other between the first portion 4 and the second portion 10 when the respective filter holder 2, 3 is placed in the area of exhaust 18. In the particular embodiment shown in the figures, the button selection 42, 43 is configured for: - come into contact with the first portion 4 when the first filter holder 2 is located in the discharge area 18; and - do not come into contact with the second portion 10 when the second filter holder 3 is located in the discharge area 18. In other words, the touch probes 20 shown in the figures are configured to contact only the first filter holder 2 and not the second filter holder 3; not However, alternative forms of implementation are excluded in which the sensing means 20 are configured to contact only the second filter holder 3 and not the first filter holder 2, or to contact both of them, but with modality different ones that allow us to distinguish between the first characteristic form and the second characteristic form (for example via a button or a lever that can be pressed in different positions depending on the actual size of the filter holders 2, 3). Usefully, the select button 42, 43, comprises a fork equipped with: - two free sections 42 configured to come into contact with the first portion 4; - a connecting section 43 placed between the free sections 42. Since, as mentioned, the first portion 4 coincides with the single beak of dispensing 9 of the first filter holder 2, which can be placed indistinctly to the right or left with respect to the first handle of handle 5, then it is easy to understand that the particular arrangement to provide two free sections 42 connected by a connecting section 43 allows the selection button 42, 43 to be pressed / squeezed by the single dispensing spout 9 regardless of which side it is on mounted with respect to the first handle of grip 5, increasing the flexibility of use of the coffee grinder 1. In other words, one of the free sections 42 is intended to intercept and enter in contact with the single dispensing spout 9 when arranged on the right with respect to the first handle of grip 5, while the other of the free sections 42 is intended to intercept and come into contact with the single beak of delivery 9 when placed to the left of the first handle of handle 5. Helpfully, the 42 free sections are placed one on the right and one on the left. compared to the confirmation button 38; this particular arrangement allows you to optimize the spaces on board the coffee grinder 1 and reduce the overall size of the electromechanical detection means 19. Advantageously, the selection button 42, 43 is movable, at least in part, along a direction substantially parallel to the driving direction D; in this way, the selection button 42, 43 is automatically pressed / squeezed when the first filter holder 2 is inserted along the driving section 36, 37. In the context of this discussion, the fact that the selection button 42, 43 is at least partly movable parallel to the driving direction D means that the selection button 42, 43 can move along trajectories different, for example rectilinear, curvilinear or a combination of the two, but however, a component of its motion is parallel to the direction of travel D. For example, in the embodiment shown in the figures, the button selection 42, 43 is hinged around a hinge axis 44 substantially horizontal and orthogonal to the driving direction D; when the selection button 42, 43 is pressed / squeezed, it is subjected to a rotary motion around the hinge axis 44, which has a motion component also along a direction parallel to the direction of guide D. However, alternative forms of implementation of this provision are not excluded. invention wherein the selection button 42, 43 is not hinged and rotatable around an axis, but rather for example sliding in motion straight along the driving direction D or along an oblique direction with respect to the driving direction. Advantageously, the selection button 42, 43 is associated with a spring return 45 which determines its return to an initial rest position once the crushing by the first filter holder 2 is finished. In other words, the selection button 42, 43 is movable between the position initial rest position and a final crushing position; when the first filter holder 2 is placed in the discharge area 18, the button selection 42, 43 moves from the initial rest position to the position final crushing under the pressure of the first filter holder 2 and in contrast to the spring force exerted by the return spring 45, while when the first filter holder 2 is removed from the discharge area 18, the button selection 42, 43 moves from the final crushing position to the initial rest position under the thrust exerted by the return spring 45. Usefully, the coffee grinder 1 comprises at least one electronic unit processing and control 46 operationally connected to the means of electromechanical detection 19 and grinding group 17 and configured for: - activate the grinding group 17 to grind a dose of coffee when the electromechanical detection means 19 detect that the first filter holder 2 is placed in the discharge area 18; and - activate the grinding group 17 to grind two doses of coffee when the electromechanical detection means 19 detect that the second filter holder is placed in the discharge area 18. In other words, the coffee grinder 1 is of the so-called “on-demand” type, in which the Grinding of coffee beans G occurs only at the desired time from the operator. In more detail, the electronic processing and control unit 46 is example connected to the confirmation button 38 via electric cables 47; confirmation button 38 contains a switch inside, not shown in the figures, which opens and closes the electrical connection between the cables electric 47, thus allowing to supply the electronic processing unit and control 46 the information of the presence or absence of filter holders 2, 3 in the unloading area 18. Furthermore, the electronic processing and control unit 46 is e.g. connected to the selection button 42, 43 via electrical wires 48; the button of selection 42, 43 is associated with a switch 49, which opens and closes the electrical connection between the 48 electrical wires, thus allowing to provide to the electronic processing and control unit 46 the information of the presence or absence of the first filter holder 2 in the discharge area 18. The operation of the coffee grinder 1 is as follows. When you want to prepare just one coffee, the operator holds the first one filter holder 2 and places it in the discharge area 18 of the coffee grinder 1. The movement of the first filter holder 2 along the guide direction D determines the pressing of both the confirmation button 38 and the selection button 42, 43 (figures 6, 7 and 8). The electronic processing and control unit 46, which is electrically connected to both the confirmation button 38 and the selection button 42, 43, is therefore able to understand that a filter holder 2, 3 has been placed in the unloading area 18 (information provided by the confirmation button 38) and that it is the first filter holder 2 (information provided by the button selection 42, 43); the electronic processing and control unit 46 processes this information and activates the grinding group 17 for a time preset that allows you to grind just one dose of coffee. In detail, the first motor 26 is activated and the coffee beans G are conveyed from the hopper 23 to the grinding group 17 they are ground and reduced in a single dose of coffee powder P, which is conveyed to gravity along the annular chamber 30 towards the first filter 7 contained in the first filter holder 2 (figure 2). Subsequently, the electronic processing and control unit 46 activates also the actuator means 32 to move the presser 33, which moves vertically downwards and compresses the coffee powder P present in the first filter 7 (figure 3). Once the coffee powder P has been pressed, the presser 33 returns upwards in its initial resting position. At this point the operator can remove the first filter holder 2 from the coffee grinder 1 and connect it to a coffee machine in cup (not visible in the pictures). When, however, you want to prepare two coffees and not just one, they are perform the same operations but with the second filter holder 3 and not with the first filter holder 2. In particular, the operator places the second filter holder 3 in the area of discharge 18, causing the confirmation button 38 to be pressed but not of the selection button 42, 43, given the different shape of the second portion 10 compared to the first portion 4 (figures 9, 10 and 11). The electronic processing and control unit 46 is therefore able to understand that a filter holder 2, 3 has been placed in the exhaust area 18 (information provided by the confirmation button 38) and that it is the second filter holder 3, as the selection button 42, 43 is not pressed / squeezed; the electronic processing and control unit 46 processes this information and activates the grinding group 17 for a preset time that allows you to grind two doses of coffee. In detail, the first motor 26 is activated and the coffee beans G are conveyed from the hopper 23 to the grinding group 17 they are ground and reduced in a double dose of coffee powder P. At this point the operation of the coffee grinder 1 is the same as described in precedence with reference to the first filter holder 2; in fact, the coffee powder Freshly ground P is conveyed by gravity into the second filter 13 contained in the second filter holder 3 and is pressed by the presser 33, so as to get a filter holder ready to connect to your coffee machine. Finally, it is emphasized that the present invention does not only concern the coffee grinder 1 as such but also an assembly for grinding and filling a filter with ground coffee to be connected to a machine for dispensing coffee into the cup, including: - the coffee grinder 1 described above; - the first filter holder 2 configured to contain the single dose of coffee and having the first portion 4 with the first characteristic shape; and - the second filter holder 3 configured to contain the double dose of coffee and having the second portion 10 with the second shape characteristic different from the first characteristic form. In other words, the following are intended to be protected by this invention: - both the coffee grinder 1 as such, which can be offered for sale separately from filter holders 2, 3 and is intended to be used with 2, 3 filter holders already existing and of known type, or with 2, 3 filter holders specially dedicated, but still purchasable separately from the coffee grinder 1; - both the assembly composed of the coffee grinder 1 and the filter holders 2, 3, and can be offered for sale together (for example packaged in the same box) and in which the filter holders 2, 3 can be of the already existing type existing and known, or be specifically dedicated.

Claims

1) Coffee grinder (1) for grinding and filling with ground coffee a filter to be connected to a machine for dispensing coffee into a cup, comprising: at least one support frame (16); at least one grinding unit (17) associated with said support frame (16) and configured to grind coffee beans (G) and obtain coffee powder (P); at least one discharge area (18) for said coffee powder (P), arranged below said grinding unit (17) and configured to receive, alternatively: a first filter holder (2) configured to contain a single dose of coffee and having a first portion (4) with a first characteristic shape; and a second filter holder (3) configured to contain a double dose of coffee and having a second portion (10) with a second characteristic shape different from said first characteristic shape;electromechanical detection means (19) associated with said support frame (16) and configured to detect which of said first filter holder (2) and said second filter holder (3) is located in said discharge area (18), said electromechanical detection means (19) comprising feeler means (20) arranged in proximity to said discharge area (18) and capable of coming into contact with at least one of said first portion (4) and said second portion (10) when said filter holders (2, 3) are located in said discharge area (18).; 2) Coffee grinder (1) according to claim 1, characterised in that it comprises at least one electronic processing and control unit (46) operatively connected to said electromechanical detection means (19) and to said grinding group (17) and configured to: activate said grinding group (17) for grinding one dose of coffee when said electromechanical detection means (19) detect that said first filter holder (2) is placed in said discharge area (18); and activate said grinding group (17) for grinding two doses of coffee when said electromechanical detection means (19) detect that said second filter holder (3) is placed in said discharge area (18). 3) Coffee grinder (1) according to one or more of the preceding claims, characterised in that said discharge area (18) comprises a guide section (36, 37) suitable for guiding said filter holders (2, 3) along a substantially horizontal guide direction (D). 4) Coffee grinder (1) according to one or more of the preceding claims, characterised in that said electromechanical detection means (19) comprise at least one confirmation button (38) arranged in proximity to said discharge area (18) and capable of coming into contact with said first filter holder (2) and with said second filter holder (3) when said filter holders (2, 3) are placed in said discharge area (18). 5) Coffee grinder (1) according to one or more of the preceding claims, characterised in that said confirmation button (38) is movable along a direction substantially parallel to said driving direction (D). 6) Coffee grinder (1) according to one or more of the preceding claims, characterised in that said feeler means (20) comprise at least one selection button (42, 43) configured to: come into contact with one of said first portion (4) and said second portion (10) when the respective filter holder (2, 3) is placed in said discharge area (18); and not come into contact with the other of said first portion (4) and said second portion (10) when the respective filter holder (2, 3) is placed in said discharge area (18). 7) Coffee grinder (1) according to one or more of the preceding claims, characterised in that said selection button (42, 43) is configured to: come into contact with said first portion (4) when said first filter holder (2) is placed in said discharge area (18); and not come into contact with said second portion (10) when said second filter holder (3) is placed in said discharge area (18). 8) Coffee grinder (1) according to one or more of the preceding claims, characterised in that said selection button (42, 43) comprises a fork element provided with: two free sections (42) configured to come into contact with said first portion (4); a connecting section (43) interposed between said free sections (42). 9) Coffee grinder (1) according to one or more of the preceding claims, characterised in that said selection button (42, 43) is movable, at least in part, along a direction substantially parallel to said driving direction (D). 10) Assembly for grinding and filling with ground coffee a filter to be connected to a machine for dispensing coffee into a cup, comprising: a coffee grinder (1) according to one or more of claims 1 to 9; a first filter holder (2) configured to contain a single dose of coffee and having a first portion (4) with a first characteristic shape; and a second filter holder (3) configured to contain a double dose of coffee and having a second portion (10) with a second characteristic shape different from said first characteristic shape.