Machine for the preparation of a beverage

Abstract

A machine (60) for preparing beverages includes: a hopper (66) for feeding coffee beans; a grinding device (65) connected to the hopper (66); a removable container (11) configured to receive powdered material to be extracted from the grinding device (65); and a tamping extraction unit (10) having a cylinder-piston type hydraulic actuator (17). At least one of the container (11) and the tamping extraction unit (10) is movable between a first operating position and a second operating position, in which the container (11) is aligned with the tamping extraction unit (10) and in the second operating position, the container (11) is aligned with the grinding device (65).

Description

Technical Field

[0001] This disclosure relates to a machine for preparing beverages (particularly coffee beverages). Background Technology

[0002] Fully automatic coffee-making machines are known in which all operations, such as loading coffee powder into the infusion chamber, compressing the coffee powder, dispensing extraction water, and discharging spent coffee powder, are performed automatically without any operator intervention.

[0003] In such machines, the extraction chamber is typically defined by a piston and a cylinder, and the compression of coffee powder is usually achieved by moving the cylinder toward the stationary piston using a drive mechanism.

[0004] Semi-automatic coffee preparation machines are also known, in which the extraction chamber is defined within a filter holder that can be inserted and attached to the machine by an operator, and where loading and removing of coffee powder are performed manually by the operator. In such machines, the coffee powder compression zone is separated from the extraction zone, and the operator typically needs to move the filter holder from one position to another.

[0005] However, in order to reduce the manual operations that operators must perform while reducing the overall size of the machine, a solution for a super-automatic machine has been developed in which the operation of compressing coffee powder and infusing beverages is performed in a single position on the filter holder without the need to move the filter holder.

[0006] However, solutions typically used in fully automatic machines cannot be directly applied to semi-automatic machines because the filter holder is not a fixed component and is integrated into the machine. Therefore, it cannot be associated with a piston as in fully automatic machines to conveniently compress coffee powder and counteract the pressure required to prepare espresso (which may exceed 10 bar).

[0007] Therefore, there is a need to improve the machines used for beverage preparation, so that they can overcome the shortcomings of existing technologies.

[0008] Therefore, it is necessary to solve the following technical problem: to provide an automated type of machine for preparing beverages that is compact and efficient, and ensures effective and rapid compression and extraction of coffee powder, while minimizing the operations that must be performed manually by the user.

[0009] Another object of this disclosure is to provide a machine for preparing beverages, which is equipped with a tamping extraction unit that always maintains a hydraulic seal between a hydraulically actuated actuator and a filter holder, and is suitable for compressing coffee powder and always supports the pressure required for extraction.

[0010] The applicant has designed, tested and implemented this disclosure to overcome the shortcomings of the prior art and to obtain these and other purposes and advantages. Utility Model Content

[0011] This disclosure is set forth and characterized in the following. Other features or variations of the main technical concept of this disclosure are described below.

[0012] In accordance with the aforementioned objectives, and in order to solve the disclosed technical problems in a novel and original manner, and to achieve significant advantages over the prior art, a machine for preparing beverages, particularly espresso, comprises:

[0013] A hopper used to feed coffee beans.

[0014] The grinding device connected to the hopper;

[0015] A detachable container configured to receive the powdered material to be extracted from the grinding apparatus; and

[0016] The powder extraction unit includes a cylinder-piston type hydraulic actuator.

[0017] According to this disclosure, at least one of the container and the powder extraction unit is movable between a first operating position and a second operating position, in which the container is aligned with the powder extraction unit, and in the second operating position, the container is aligned with the grinding device for being filled with the powdered material.

[0018] According to an embodiment, the machine includes a grinding device connected to a hopper for feeding coffee beans, and the container is aligned with the tamping and extraction unit in a first operating position and with the grinding device in a second operating position for being filled with the powdered material.

[0019] According to a possible embodiment, the movement between the first position and the second position is performed axially along a direction located on the intermediate plane of the machine.

[0020] Depending on the possible variations, the movement can be made in the lateral direction, in a straight line, or along an arc.

[0021] According to further variations, the container can be kept stationary, and the extraction unit and possibly the coffee powder supply device can be moved between an operating position and a non-operating position. In the operating position, they are aligned with the container or, in any case, engaged with the container, while in the non-operating position, they are not engaged with the container.

[0022] According to one aspect of this disclosure, the powder extraction unit includes:

[0023] The first feeding conduit is connected to a hydraulic actuator and configured to supply pressurized powder liquid to move the cylinder relative to the piston from the starting position to the extraction position.

[0024] The second supply conduit is configured to supply extraction water to the extraction chamber;

[0025] The cylinder body is provided with a radial sealing gasket, which is configured to engage with the side wall of the container or with a filter element arranged in the container in a sealing sliding contact manner.

[0026] The construction of the hydraulic actuator (i.e., where the cylinder defines the movable portion) also helps to ensure a seal near the coffee powder container.

[0027] According to one aspect of this disclosure, the cylinder body includes a head portion and an annular seat, the head portion being configured to be inserted into a container and having a cross section substantially corresponding to the cross section of the container, the annular seat surrounding the head portion, and the aforementioned radial sealing gasket being received in the annular seat.

[0028] According to another aspect of this disclosure, a radial sealing gasket is disposed near the lower edge of the annular seat.

[0029] According to one aspect of this disclosure, the piston is hollow inside, and the powder-pressing liquid is supplied into the piston.

[0030] According to another aspect of this disclosure, the cylinder body includes a sliding seat whose shape is substantially related to the shape of a piston disposed therein, the sliding seat having a bottom wall having an upper surface on which the powdered liquid is adapted to act.

[0031] According to another aspect of this disclosure, the cylinder body includes a second through channel, which is preferably arranged in its peripheral portion, one side of which is connected to a second supply conduit and the other side of which is connected to a distribution chamber defined by a lower surface of the cylinder body opposite to the upper surface.

[0032] According to another aspect of this disclosure, the hydraulic actuator is of the single-acting type and includes an elastic device connected between the cylinder and the piston and configured to return the cylinder to the starting position in the absence of pulverized fluid. Attached Figure Description

[0033] These and other aspects, features, and advantages of this disclosure will become apparent from the following description, which is given as a non-limiting example, with reference to the accompanying drawings, in which:

[0034] Figure 1 This is a schematic diagram of the powder extraction unit according to this disclosure;

[0035] Figure 2 and Figure 3 It shows Figure 1 The two operating states of the powder extraction unit in the process;

[0036] Figure 4 yes Figure 2 Enlarged detail image;

[0037] Figure 5 A variation of the container for the powder extraction unit according to this disclosure is shown;

[0038] Figure 6 This is a schematic side view of a machine for preparing beverages according to the present disclosure;

[0039] Figure 7 According to the first embodiment of this disclosure Figure 6 A schematic diagram of the hydraulic circuit of the machine;

[0040] Figure 8 According to the second embodiment of this disclosure Figure 6 A schematic diagram of the hydraulic circuit of the machine.

[0041] It must be noted that the terms and phrases used in this specification and the contents shown in the accompanying drawings are solely intended to better illustrate and explain this disclosure, and serve to provide non-limiting examples for the disclosure itself, as the scope of protection is defined by the claims.

[0042] For ease of understanding, the same reference numerals are used in the accompanying drawings to identify the same common elements where possible. It should be understood that elements and features of one embodiment can be readily combined or incorporated into other embodiments without further explanation. Detailed Implementation

[0043] Reference Figure 6The present invention illustrates a machine 60 for preparing beverages according to the present disclosure, the machine including a powder extraction unit 10 according to the present disclosure and a container 11 configured to contain powdered substances.

[0044] Specifically, refer to Figure 1 The container 11 may be a type of container referred to as a filter holder, which is provided with a handle 12 by which a user can grip and move the container in order to insert or remove it from the housing 15 of the machine 60. The container 11 may preferably be cylindrical, although other shapes are not excluded.

[0045] The filter element 13 can be disposed inside the container 11. The filter element is provided with holes or is in the shape of a mesh with a mesh size suitable for retaining coffee powder, but allows the beverage to flow to the outlet opening 14 located at or connected to the bottom of the container 11.

[0046] according to Figures 1-4 In the exemplary embodiment shown, the filter element 13 may extend over the entire area corresponding substantially to the cross-section of the bottom wall of the container 11, and may be secured by known fastening members (e.g., screws) or by shape coupling.

[0047] according to Figure 5 In the variant shown, the filter element 13 may extend substantially over the entire inner surface of the container 11 and be fixed to the sidewall 16 of the container 11 (e.g., by coupling with the upper edge shape of the sidewall 16).

[0048] The powder extraction unit 10 includes a cylinder-piston type hydraulic actuator 17, which includes a piston 18 and a cylinder 19 movable relative to the piston 18 in the direction F1.

[0049] Specifically, the cylinder 19 is movable between a starting position P1 and an extraction position P2. In the starting position, the cylinder 19 is located outside the container 11. In the extraction position, the cylinder 19 is at least partially disposed inside the container 11 and together with the container defines a substantially enclosed extraction chamber 20.

[0050] According to this disclosure, the cylinder 19 is provided with a radial sealing gasket 23, which is configured to engage with the side wall 16 of the container 11 or with the filter element 13 arranged in the container 11 in a sealing sliding contact manner.

[0051] According to an embodiment, the sealing gasket 23 is configured to mate with at least one of the inner or outer side of the sidewall 16 of the container 11 (or the filter element 13).

[0052] According to the embodiment shown in the accompanying drawings, the sealing gasket 23 is configured to mate with the outer side 24 of the side wall 16 (or filter element 13) of the container 11.

[0053] For example, the sealing gasket 23 may be an O-ring, adapted to produce a continuous seal across the entire outer side 24 (or possibly inside the sidewall 16).

[0054] The cylinder body 19 is hollow inside and includes a sliding seat 33 whose shape is substantially related to the shape of the piston 18 disposed therein, and the sliding seat is closed at one end by a solid bottom wall 30 having an upper surface 34 on which the powdered liquid is adapted to act, as will be explained below.

[0055] The piston 18 may include an annular washer 44 configured to engage with the inner surface of the slide seat 33 to prevent leakage of the pressed powder liquid.

[0056] According to an embodiment, the cylinder 19 includes: a head portion 25 having a bottom wall 30, the cross-section of which corresponds substantially to or is slightly smaller than the internal cross-section of the container 11, so that the head can be inserted into and slide within the container; and an annular seat 26 formed around the head portion 25.

[0057] The sealing gasket 23 is located inside the annular seat 26, preferably near the lower edge of the annular seat.

[0058] According to an embodiment, the outer surface of the head portion 25 defines a first side of the annular seat 26, while the protrusion 27 of the cylinder body 19 defines an opposite second side.

[0059] The protrusion 27 substantially surrounds the head portion 25 and may extend substantially to its end, or optionally extend further.

[0060] According to an embodiment, the protrusion 27 is shaped to laterally define a receiving cavity 28 for the sealing gasket 23, which is preferably closed on three sides in order to properly hold the sealing gasket 23 in place.

[0061] According to a variation (not shown), an annular seat 26 is formed in the side wall of the head portion 25, and a sealing gasket 23 is inserted therein, so that it engages with the inside of the side wall 16 of the container 11 (or the filter disposed therein) during use.

[0062] The powder extraction unit 10 includes a first conduit 21 and a second conduit 22. The first conduit is connected to a hydraulic actuator 17 and configured to supply pressurized powder liquid under pressure to move the cylinder 19 from the starting position P1 to the extraction position P2. The second conduit is configured to supply extraction water to the extraction chamber 20.

[0063] According to one aspect of this disclosure, the piston 18 is internally hollow, that is, the piston includes at least one first through channel 29 through which the powdered liquid is supplied.

[0064] In the starting position P1 ( Figure 1 The first through channel 29 can be substantially closed at its bottom by a bottom wall 30. The bottom wall 30 can be substantially flat or have protrusions 31 adapted to be inserted into the first through channel 29.

[0065] When cylinder 19 is in extraction position P2 ( Figure 2 and Figure 3 When the piston 18 and cylinder 19 are in operation, an accumulation chamber 32 is formed between them.

[0066] The cylinder body 19 may include a second through channel 36, which is preferably arranged laterally relative to the sliding seat 33, connected to a second conduit 22 on one side and to a distribution chamber 37 on the other side, which is associated with the lower surface 35 of the head portion 25, which is opposite to the upper surface 34.

[0067] The distribution chamber 37 may be defined at least below by a perforated element 38 having holes and / or mesh adapted to prevent powdery material from passing through during compression.

[0068] According to an embodiment, the hydraulic actuator 17 is of the single-acting type and includes an elastic device 39 connected between the cylinder 19 and the piston 18, the elastic device 39 being configured to return the cylinder 19 to the starting position P1 in the absence of powder fluid.

[0069] The elastic device 39 may include a spring 40 arranged coaxially with the piston 18 and connected to the piston 18 on one side and to the cylinder 19 or an adjacent element 45 integrally formed therewith on the other side.

[0070] The piston 18 may be mushroom-shaped and includes a head 41 and a body 42, the shape and cross-section of which correspond to the shape and cross-section of the slide seat 33, and the body 42 having a smaller cross-section in order to define a receiving seat 43 for the spring 40.

[0071] Figures 6 to 8 Two possible embodiments of a beverage preparation machine 60, including the powder extraction unit 10 as described above, and a hydraulic circuit are shown respectively.

[0072] The machine 60 includes a hydraulic circuit 61 adapted to supply the powdered fluid and extraction water to a first conduit 21 and a second conduit 22. A pump 62 and a heating device 64 are arranged along the hydraulic circuit. The pump 62 draws water from a water tank 63. The heating device 64 is, for example, of the flow-through type and is equipped with a resistor.

[0073] One or more sensors, such as flow sensor 67, or flow meter, temperature sensor 68, and / or safety valve 69, can be arranged along the hydraulic circuit 61.

[0074] According to an embodiment, the machine 60 may include a grinding device 65 connected to a hopper 66 for feeding coffee beans and equipped with a grinder.

[0075] The container 11 can be moved between a beverage preparation position and a filling position, either manually or mechanically (e.g., by means of a drive motor). In the beverage preparation position, the container is aligned with the tamping and extraction unit 10. In the filling position, the container is aligned with the grinding device 65 to be filled with powdered material obtained by grinding coffee beans.

[0076] Specifically, the container 11 can move between one position and another within the housing 15, that is, the container can be moved from one position to another without needing to be removed from the machine 60.

[0077] according to Figure 6 In the embodiment illustrated schematically, the movement of container 11 between the beverage preparation position and the filling position can be carried out on a substantially horizontal plane, i.e., maintained at the same height relative to the support plane of the machine.

[0078] Depending on the possible variations, the movement of container 11 can be carried out on a horizontal plane or at an angle slightly tilted relative to the horizontal plane, for example, between 0° and 20°.

[0079] According to a possible embodiment, the movement between the first position and the second position is axially performed along direction F3, which is located on or parallel to the intermediate plane of the machine 60. Figure 6 The intermediate plane can be a plane that passes through the center line of container 11 and handle 12.

[0080] Depending on the possible variations, the movement can be made in the lateral direction, in a straight line, or along an arc.

[0081] According to an embodiment, the movement of container 11 between one operating position and another operating position can be performed on a substantially horizontal plane, or at an angle of at most slightly tilted relative to the horizontal plane, for example, between 0 and 20°.

[0082] Preferably, the first and second positions are such that the vertical geometric projections of the corresponding areas occupied by the container in the first and second positions onto a horizontal plane are intercepted by at least one identical geometric straight line on the horizontal plane, the orientation of which is parallel to the horizontal unfolding direction of the machine 60 in the depth direction, thereby maintaining the dimensions contained in the width direction of the machine 60. In other words, these areas can be aligned on the same straight line in the depth direction, or offset in the opposite direction, until they are tangent to that straight line.

[0083] According to further variations, the container 11 can be configured such that it remains stationary in a fixed position, while the tamping and extraction unit 10 and possibly the coffee powder supply device move between an operating position and a non-operating position. In the operating position, they are aligned with or cooperate with the container 11, respectively, while in the non-operating position, they are not cooperated with the container 11.

[0084] Machine 60 may be equipped with a control unit 70 and / or a user interface 80. The control unit is configured to adjust the operation of machine 60, and the operator may instruct the preparation of beverages by means of the user interface, possibly by selecting between "hot" and "cold" beverages and / or selecting the amount of beverage to be prepared (e.g., single or double serving).

[0085] According to an embodiment, the liquid used for pressing the powder is water, and the water tank 63 supplies water to both the first conduit 21 and the second conduit 22.

[0086] according to Figure 7 In the embodiment shown, the hydraulic circuit 61 includes a first supply circuit 71 for supplying to the hydraulic actuator 17 and a second supply circuit 72 for supplying to the extraction chamber 20. The first and second supply circuits preferably share a portion of the hydraulic circuit 61 and are preferably separated downstream of the pump 62.

[0087] The first loop 71 is configured to follow... Figure 7 The path A, indicated by the dotted line, supplies water to pump 62.

[0088] The second loop 72 can be configured to deliver water through a heating device 64 located upstream of the extraction chamber 20, along... Figure 7 The dash-dot line in the diagram indicates path B, which supplies water via pump 62.

[0089] According to an embodiment, a third loop 73 may also be provided, which is configured to direct the water supplied by pump 62 along the path of... Figure 7The path C indicated by the dot-dot line in the diagram is supplied to the extraction chamber 20.

[0090] According to an embodiment, a check valve 74 is provided along the first circuit 71. Once the hydraulic actuator 17 is filled with water and a predetermined pressure threshold has been reached, the check valve 74 allows the isolation of section D of the hydraulic circuit (in...). Figure 7 In Chinese, it is represented by a double dot-line.

[0091] According to an embodiment, the check valve 74 may be a piston valve.

[0092] Once loop segment D is isolated, the water drawn by pump 62 is diverted along a loop different from the first loop 71 (specifically the second loop 72 or possibly the third loop 73).

[0093] According to possible implementations, the hydraulic circuit 61 may include, for example, a diverter valve 75 disposed upstream of the check valve 74, which may be selectively activated to supply water directly from the water tank 63 to the extraction chamber 20.

[0094] Path A can be connected to discharge circuit 77, through which water used as the powder-pressing fluid can be discharged, thereby allowing cylinder 19 to return to the starting position P1.

[0095] A selectively controllable discharge valve 78 may be arranged along the discharge circuit 77 to open or close the discharge circuit and allow water to be removed from the hydraulic actuator 17.

[0096] The water used for pressing the powder is conveyed to the drain pan 200.

[0097] According to a possible implementation, the discharge circuit 77 can be directly connected to the water tank 63.

[0098] According to this embodiment, water is initially drawn by pump 62 and transported along the first loop 71 (path A) until the cylinder 19 compresses the powdered material and reaches a defined pressure in the extraction chamber 20. This defined pressure can be set, for example, by a pressure reducing valve 79 arranged in communication with the extraction chamber 20. This defined pressure can be, for example, between 2 and 6 bar.

[0099] When the pressure limit is reached, the first circuit 71 is effectively isolated, and the water flow is diverted to the second circuit 72 (path B), or possibly to the third circuit 73 (path C) by activating the diversion valve 75.

[0100] At the end of extraction, drain valve 78 opens, allowing water to drain from hydraulic actuator 17. The resilient device 39, no longer under pressure, can then extend, returning cylinder 19 to its starting position.

[0101] Figure 8 A variant of the hydraulic circuit 161 is shown, which is related to... Figure 7 The difference in hydraulic circuit 61 is that the first circuit 171 (path A1) and the second circuit 172 (path B1) separate downstream of the heating element 64, thereby allowing the hydraulic actuator 17 to operate by means of hot water. Figure 8 In, with Figure 7 The same elements are indicated by the same reference numerals and will not be described further.

[0102] Also according to Figure 8 In one embodiment, water drawn by pump 62 is supplied to hydraulic actuator 17 to compress the powdered substance, and when a defined pressure is reached in extraction chamber 20, the first circuit 171 is isolated when pressure relief valve 79 is activated, and water is diverted toward extraction chamber via second circuit 172 or possibly third circuit 173.

[0103] At the end of extraction, opening the drain valve 78 allows water to be removed from the hydraulic actuator 17 and allows the cylinder 19 to be reset to the starting position P1.

[0104] The control unit 60 may be operatively connected to the pump 62, the heating device 64, one or more valves 75, 78, and possibly also to the grinding device 65, and the control unit is configured to adjust its operation based on commands received via the interface 80 and / or data detected by the sensors 67, 68.

[0105] The control unit 60 can also be configured to control the operation of a drive member associated with the container 11, which causes the container to move between a filling position and a beverage preparation position, and / or vice versa.

[0106] The operation method of the powder extraction unit 10 (which is not part of this utility model) provides to fill the container 11 with a powdered substance and position it below the powder extraction unit 10. Figure 1 ). Container 11 can be inserted, for example, in the axial direction in direction F.

[0107] The method then provides to supply pressurized powder fluid under pressure through a first conduit 21 to bring cylinder 19 into extraction position P2, wherein head portion 25 is arranged within container 11. In this way, the size of extraction chamber 20 can also be adjusted according to the amount of powdered material.

[0108] The method then includes providing extraction water to the extraction chamber 20 through a second conduit 22, and performing the extraction of the powdered substance.

[0109] The extracting water passes through the powdered substance to extract its aroma, and the beverage can flow out through the outlet opening 14 of container 11 and be received in a suitable container 46.

[0110] When the beverage preparation is finished, container 11 can be removed and manually emptied by the operator.

[0111] This method provides the use of water contained in water tank 63 as both the powder-pressing fluid and the extraction water.

[0112] According to an embodiment, the method provides to supply cold water to the hydraulic actuator 17.

[0113] According to a variant, the method provides to supply hot water heated by means of a heating device 64 to the hydraulic actuator 17.

[0114] According to an embodiment, the method provides that when it is necessary to prepare espresso or a typical "hot" coffee beverage, the extraction water is heated by means of a heating device and then supplied to the extraction chamber 20.

[0115] The method also provides a way to supply extraction water directly from water tank 63 to extraction chamber 20 when it is necessary to prepare a "cold" coffee beverage.

[0116] The method for preparing a beverage using the machine 60 described above (which is not part of this invention) provides: receiving an instruction to prepare a beverage, filling a container with a powdered substance, and performing the pressing and extraction process described above.

[0117] The method for preparing a beverage may also include inserting the container 11 into the housing 15, moving the container 11 to the filling position, filling the container 11 with a certain amount of powdered material ground by the grinding device 65, and then moving the container to the beverage preparation position.

[0118] Instructions regarding the beverage to be prepared may include selecting a “hot” or “cold” beverage, and the method provides to operate the diversion valve 75 to supply hot water heated by the heating device 64 to the hydraulic actuator 17 and the extraction chamber 20, or to supply cold water drawn directly from the water tank 63, respectively, depending on the selection.

[0119] Obviously, modifications and / or additions can be made to the machine 60 for preparing beverages as described above without departing from the field and scope of the present invention as defined by the claims.

[0120] It is also apparent that, although this disclosure has been described with reference to some specific examples, those skilled in the art will be able to manufacture many other equivalent machines for preparing coffee beverages that have the features set forth in the claims, and all of these fall within the scope of protection defined by the claims.

[0121] In the following claims, the reference numerals in parentheses are for ease of reading only and should not be considered as limiting factors of the scope of protection defined by the claims.

Claims

1. A machine (60) for preparing beverages, comprising: A hopper (66) for feeding coffee beans; a grinding device (65) connected to the hopper (66); A removable container (11) configured to receive powdered material to be extracted from the grinding device (65); and a pressing extraction unit (10) having a cylinder-piston type hydraulic actuator (17), characterized in that at least one of the container (11) and the pressing extraction unit (10) is movable between a first operating position and a second operating position, in the first operating position the container (11) is aligned with the pressing extraction unit (10), and in the second operating position the container (11) is aligned with the grinding device (65).

2. The machine (60) according to claim 1, characterized in that, The container (11) is axially movable between the first operating position and the second operating position, and vice versa.

3. The machine (60) according to claim 2, characterized in that, The container (11) is axially movable along the direction located on the intermediate plane of the machine (60).

4. The machine (60) according to claim 1, characterized in that, The container (11) is capable of moving in the lateral direction, in a straight line or along an arc between the first operating position and the second operating position, and vice versa.

5. The machine (60) according to any one of claims 1 to 4, characterized in that, The movement of the container (11) between the beverage preparation position and the filling position is carried out on a basically horizontal plane.

6. The machine (60) according to any one of claims 1 to 4, characterized in that, The machine includes a drive member configured to move the container (11) between a first operating position and a second operating position, and / or vice versa.

7. The machine (60) according to claim 1, characterized in that, The container (11) is stationary, and the tamping extraction unit (10) and / or coffee powder supply device are movable between the first operating position and the second operating position.

8. The machine (60) according to claim 1, characterized in that, The powder extraction unit (10) includes: A first supply conduit (21) is connected to the hydraulic actuator (17) and configured to supply a pressurized liquid to compress the powdered substance; The second supply conduit (22) is configured to supply extraction water to the extraction chamber (20).

9. The machine (60) according to claim 8, characterized in that, The hydraulic actuator (17) includes a cylinder (19) configured to move relative to a piston (18) between a starting position (P1) and an extraction position (P2), in which the cylinder is located outside the container (11) and in the extraction position, the cylinder is located inside the container (11) and together with the container defines the extraction chamber (20). The cylinder (19) is provided with a radial sealing gasket (23), which is configured to engage with the side wall (16) of the container (11) or with the filter element (13) arranged in the container (11) in a sealing sliding contact manner.

10. The machine (60) according to claim 9, characterized in that, The piston (18) is hollow inside and includes a first through channel (29) through which the pressed powder liquid is supplied. In the initial position (P1), the first through channel is closed at the bottom by the bottom wall (30) of the cylinder (19).

11. The machine (60) according to claim 9 or 10, characterized in that, The cylinder (19) includes a second through channel (36), one side of which is connected to the second supply conduit (22), and the other side of which is connected to a distribution chamber (34) associated with the lower surface (35) of the cylinder (19).

12. The machine (60) according to claim 9, characterized in that, The hydraulic actuator (17) is of the single-acting type and includes an elastic device (39) connected between the cylinder (19) and the piston (18), the elastic device being configured to return the cylinder (19) to the starting position (P1) in the absence of the powder-pressing fluid.

13. The machine (60) according to claim 12, characterized in that, The piston (18) is mushroom-shaped and includes a head (41) and a body (42). The head has a shape and cross-section corresponding to the shape and cross-section of the sliding seat (33) of the cylinder (19). The body has a cross-section smaller than that of the head (41). The body, together with the sliding seat (33), defines a housing seat (43) for the elastic device (39).

14. The machine (60) according to claim 8, characterized in that, The machine includes a water tank (63) which is connected to the first supply conduit (21) and the second supply conduit (22) by means of a hydraulic circuit (61; 161), a pump (62) and a heating device (64). The hydraulic circuit (61, 161) includes a first supply circuit (71, 171) for supplying the hydraulic actuator (17) and a second supply circuit (72, 172) for supplying the extraction chamber (20), the first supply circuit and the second supply circuit sharing a portion of the hydraulic circuit (61; 161), wherein a check valve (74) is provided along the first supply circuit (71, 171), the check valve allowing water to be delivered toward the hydraulic actuator (17) until a defined pressure threshold is reached, and isolating a downstream circuit segment when the pressure threshold is reached.

15. The machine (60) according to claim 14, characterized in that, The hydraulic circuit (61, 161) includes a third circuit (73, 173) configured to directly supply water supplied by the pump (62) to the extraction chamber (20), wherein the second supply circuit (72, 172) and the third circuit (73, 173) are connected by means of a selectively controllable diverter valve (75).

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