Heated brewing head for a coffee machine and coffee machine comprising heated brewing head
Patent Information
- Application Number
- AU2025244706
- Authority / Receiving Office
- AU · AU
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-03-25
- Filing Date
- 2025-03-20
- Publication Date
- 2026-10-08
Smart Images
Figure 00000000_0000_ABST
Abstract
Description
It can be considered as an object to improve the temperature regulation in the machine production of coffee beverages. This object is achieved by the subject matter of the independent claim. Further embodiments result from the dependent claims and from the following description. According to one aspect, a brew head assembly for a coffee machine is provided, the brew head assembly having a brew head having a shower and a heating element. The heating element is arranged on the brew head and is configured to heat the brew head before and / or during a process of producing a coffee beverage. Usually the water used for producing a coffee beverage is heated in a boiler and is then transported through a conduit system to the coffee powder. In this boiler the water is heated to a predetermined temperature. This temperature can also be monitored via a temperature regulation and adjusted to the predetermined temperature. It can now happen that the water heated in the boiler emits thermal energy, i.e. cools down, during transport through the conduit system to the coffee powder. Thus the water does not flow through the coffee powder at the predetermined temperature but has already emitted part of its thermal energy. This can have a disadvantageous effect on the quality and taste of the coffee beverage produced. In order to compensate for this disadvantage, it is proposed in the present case to couple a heating element to the brew head. In this way the brew head can be heated in order to draw less thermal energy from the water at this point, shortly before the water hits the coffee powder, or even to supply thermal energy again. The heating element is arranged on the brew head and thus at the point at which the water hits the coffee powder directly. This construction has the advantage that the brew head arrangement can be heated to a predetermined temperature so that the water used during a process of producing a coffee beverage, which is typically heated by the coffee machine in a boiler or a separate container, emits as little thermal energy as possible before the heated water flows through the coffee powder. It is thus achieved that the temperature of the water emerging from the brew head has no significant deviation or at most a very slight deviation from the predetermined temperature. According to one embodiment, the heating element is arranged on the brew head on a rear side of the brew head opposite the shower. The heating element serves, inter alia, to heat the brew head and the shower so that these two components draw as little thermal energy as possible, ideally no thermal energy at all, from the water. Rather it can even be achieved that the heated brew head supplies thermal energy to the water and increases the temperature of the water. The heating element can be configured as a continuous flow heater so that the water for producing the coffee beverage first flows through the heating element and thermal energy is supplied to the water in this way. Furthermore, however, the heating element is arranged on the brew head and in this way gives off thermal energy to the brew head and heats it. According to a further embodiment, the heating element abuts evenly against the brew head. The thermal energy is thus transmitted mainly by conduction from the heating element to the brew head because the heating element lies directly against the brew head or is thermally coupled to the brew head. For example, the heating element can be fastened to a flat surface of the brew head in that a surface of the heating element rests on the surface of the brew head and the heating element and the brew head are fixed relative to each other in this state, for example by a screw connection or a clamping connection. It is possible that a thermally conductive paste is introduced between the surfaces of the heating element and the brew head lying against each other. According to a further embodiment, the heating element is an electric heating element. A coffee machine is usually operated electrically, and part of the electrical energy can be used to heat the heating element thermally coupled to the brew head to a predetermined temperature. The heating element is configured, for example, as a heating resistor, which can also be referred to as a heating conductor. A heating resistor is an electrical component which converts electrical energy into thermal energy and in which the temperature correlates with the supplied electrical power. According to a further embodiment, the brew head assembly has a temperature detection unit thermally coupled to the brew head and configured to detect a temperature of the brew head. The temperature detection unit is, for example, a temperature sensor which is arranged on the brew head in such a way as to detect the temperature of the brew head. For example, a high-temperature conductor or a thermistor, respectively, can be used as the temperature sensor. This is a component having a temperature-dependent electrical resistance. The current temperature can be determined via the known relationship between the temperature and the value of the electrical resistance at specific temperature values. According to a further embodiment, the brew head is movably supported in the brew head assembly in such a way that the brew head can be moved within a predetermined range of movement along a direction of movement. The direction of movement contains a vertical directional component corresponding to a pressing direction of a portafilter assembly against the brew head. The heating element described here can be used in a particularly advantageous manner in a brew head assembly having a movable brew head. Because the heating element is arranged directly on the brew head, the brew head can be heated even when it moves and assumes different positional states in the brew head assembly. If the brew head is moved, the heating element simply moves along with it. The brew head assembly described here can be used, for example, in a so-called portafilter machine in which a defined quantity of ground coffee material (or coffee powder) is contained in a filter (filter basket). The filter is coupled to the brew head assembly, and the ground coffee material is enclosed by the filter and the brew head. Water under pressure and heated to a predetermined temperature is then emitted from the brew head. This water should flow as uniformly and evenly distributed as possible and at the desired or predetermined water temperature through the entire ground coffee material in order to represent an optimal brewing process from the standpoint of preparation. The water leaves the filter and the ground coffee material is retained. The filter can then be removed from the brew head assembly, and the used ground coffee material can be disposed of. The brew head is movably supported together with the heating element in the brew head assembly. The brew head can thus be moved if the filling height of the portafilter assembly with ground coffee material varies. Such a coffee machine can handle different filling heights of a filter of the portafilter assembly with ground coffee material. This coffee machine is particularly suitable for the use of changing or different types of coffee beans which require a different quantity of ground coffee material for the preparation of a coffee beverage. According to an embodiment, the brew head assembly has a suspension which movably holds the brew head in a housing of the brew head assembly, wherein the suspension has a guide element and an elastic element, wherein the guide element is coupled to the brew head and is arranged to guide the brew head in the housing along the direction of movement, and wherein the elastic element is arranged between the brew head and the housing of the brew head assembly to exert a force on the brew head in the direction of the vertical directional component. The guide element can be, for example, a pin or a rail. The guide element is structurally configured in such a way that it allows the brew head a specific range of movement. If the guide element is configured as a pin, the pin can be guided, for example, in an opening of the housing. The pin can have two longitudinal sections with different diameters. The longitudinal section with a smaller diameter is guided in the opening of the housing. If the longitudinal section with the larger diameter strikes the housing, the limit of the range of movement of the brew head is reached. Such a limit is preferably present in both directions of movement of the brew head, i.e. upwards and downwards. For example, the guide element can be dimensioned in such a way that the brew head can move by a few millimeters, e.g. 5 mm or up to 1 cm. The elastic element is arranged in the brew head assembly in such a way that it forces the brew head into an initial position, i.e. exerts a force on the brew head so that it is moved into its initial position in the brew head assembly. Without an external force acting on the brew head, the brew head is brought into its initial position by the suspension. This initial position corresponds to the state when no portafilter is introduced into the brew head assembly. If a portafilter having ground coffee material is inserted into the brew head assembly, the ground material located in the portafilter presses against the shower and the brew head. Depending on the filling quantity of the portafilter with ground material and also depending on how far the portafilter is screwed into the brew head assembly, a force is exerted on the brew head. The ground coffee material thus presses the brew head upwards out of the initial position against the force exerted by the elastic element. For example, the elastic element is a compression spring or a tension band, such as a rubber band, for example. The elastic element exerts a force in the form of a compressive force or a tensile force on the brew head. This force opposes a compressive force or vertical movement, respectively, exerted by the portafilter assembly during an insertion movement into the brew head assembly. According to a further embodiment, the elastic element is a compression spring. The compression spring can be under a preload. The preload of the compression spring determines the force which the brew head opposes a movement counter to the compressive force of the compression spring. With this force, the brew head presses on the ground material in the portafilter of the portafilter assembly. According to a further aspect, a coffee machine having a brew head assembly is provided. The brew head assembly is a brew head assembly as described above and below. The coffee machine is in particular a so-called portafilter machine. According to one embodiment, the coffee machine further has a portafilter assembly with a filter, wherein the portafilter assembly can be selectively inserted into and removed from the brew head assembly, wherein the brew head assembly is configured such that, in an inserted state of the portafilter assembly, the shower of the brew head extends into a receiving volume of the filter and rests on the ground coffee material. This means that the pressure on the shower counter to the force of the elastic element, for example counter to the compressive force of the compression spring, is not exerted directly by the filter or the portafilter on the brew head, but rather that this pressure is exerted via the ground coffee material on the shower of the brew head. The ground coffee material can thus optionally be pressed in the receiving volume of the filter. The ground coffee material located in the portafilter assembly is pressed in accordance with the force of the elastic element. It is thus ensured that the shower rests on the ground coffee material with a predefined force before and after the brewing operation, even if the filling height of the filter with ground coffee material varies within a specific range. It is conceivable that the brew head assembly has an adjustment possibility for the compressive force exerted by the elastic element. For this purpose an adjusting screw can be arranged on the brew head which increases or reduces a preload of the elastic element. The compressive force exerted on the ground coffee material is also varied in this way. According to a further embodiment, the brew head has a seal, wherein the seal is arranged circumferentially on a lateral outer wall of the brew head and seals against an inner surface of the filter in the inserted state of the portafilter assembly. The height of the filter and the penetration depth of the brew head into the receiving volume of the filter for ground coffee material are configured such that the seal is always at least partially in contact with the inner surface of the filter at all permitted filling heights of the filter with ground material and also during a movement of the brew head during the brewing operation and thus seals the receiving volume against the undesired escape of liquid. The seal preferably extends continuously over the entire circumference of the lateral outer wall of the brew head. According to a further embodiment, the suspension has a plurality of guide elements and a plurality of elastic elements. The plurality of guide elements are arranged spaced apart from one another on the brew head and the brew head assembly. For example, the guide elements are arranged equidistantly from one another, whereby the brew head is guided in a defined manner along the direction of movement. Likewise, the elastic elements are arranged equidistantly from one another to exert as uniformly distributed a force as possible on the brew head and the ground coffee material. However, the brew head can also be supported with some mechanical play in the brew head assembly so that the brew head allows, for example, a tilting movement with respect to the direction of movement or pressing direction, respectively, of the portafilter assembly, whereby a matching of the position and orientation of the brew head to the surface of the ground coffee material in the filter can take place. According to a further embodiment, the guide element is a pin which is fastened to the brew head and is movable relative to the housing. For example, the pin extends through an opening in a wall of the housing and is movable in this opening in the longitudinal direction of the pin. According to a further embodiment, the elastic element is a compression spring. A compression spring can be configured, for example, as a spiral spring and opposes a resistance or a force, respectively, to an exerted force. The compression spring is arranged in the brew head assembly in such a way that it exerts a compressive force on the brew head over the entire predetermined range of movement of the brew head and presses the brew head counter to the pressing direction of the portafilter assembly. If a portafilter assembly is introduced into the brew head assembly and pressed against the brew head, the brew head exerts a compressive force on the ground coffee material located in the filter of the portafilter assembly as soon as the portafilter assembly has reached a corresponding position. If the portafilter assembly is pressed further counter to the compressive force of the brew head, the brew head yields when the force exerted by the portafilter assembly on the brew head exceeds the compressive force of the compression spring and the brew head moves into the brew head assembly in the pressing direction of the portafilter assembly. According to a further embodiment, the elastic element is arranged to exert a compressive force on the brew head over the entire predetermined range of movement of the brew head in the brew head assembly along the direction of movement. A coffee machine having a brew head assembly as described here makes it possible to use a portafilter assembly with different filling heights of the ground coffee material in the filter. It is conceivable that ground material of different coffee bean types is used for successive brewing processes and the filling height of the ground material in the filter varies from brewing process to brewing process. The elastic element exerts a force on the brew head and holds the brew head in the initial position. If the portafilter assembly is introduced into the brew head assembly, the portafilter assembly with the ground coffee material located therein moves in the direction of the brew head until the ground coffee material lies against the brew head. If the portafilter assembly is moved further in this state, the ground coffee material is pressed against the underside of the brew head, that is to say against the shower. When the force exerted by the portafilter assembly on the brew head exceeds the force exerted by the elastic element, the brew head moves along with the portafilter assembly. In other words, the brew head is moved in a direction opposite the direction of the force exerted by the elastic element. The coffee machine described here is in particular a so-called portafilter machine. In this case, the portafilter assembly is typically introduced into the brew head assembly with a rotational movement. In the course of this rotational movement, the portafilter assembly is moved in the direction of the brew head assembly in order to enclose a space between the portafilter assembly and the brew head assembly. Located in this space is the ground coffee material, which is permeated by water under pressure and heated to a predetermined temperature in order to brew the coffee beverage. The movable brew head makes it possible to meter a compressive force acting on the ground coffee material and takes into account in particular the fact that a filling height of the ground coffee material in the filter can vary. The movable brew head can react precisely to this varying filling height and nevertheless rest on the ground coffee material with a predetermined force within a specific range of the filling height. BRIEF DESCRIPTION OF THE FIGURES Some details are described in more detail below with reference to the attached drawings. The illustrations are schematic and not to scale. Identical reference signs refer to identical or similar elements. In the drawings: FIG. 1 shows a schematic illustration of a portafilter assembly. FIG. 2 shows a schematic illustration of a brew head assembly with a portafilter assembly mounted therein. FIG. 3 shows a schematic illustration of a brew head. FIG. 4 shows a schematic illustration of the brew head from FIG. 3 from another perspective. FIG. 5 shows a schematic illustration of a brew head assembly according to a first variant having a brew head and a heating element in a first state. FIG. 6 shows a schematic illustration of the brew head assembly from FIG. 5 in a second state. FIG. 7 shows a schematic illustration of a brew head assembly according to a second variant having a brew head and a heating element in a first state. FIG. 8 shows a schematic illustration of the brew head assembly from FIG. 7 in a second state. FIG. 9 shows a schematic illustration of a coffee machine having a brew head assembly. DETAILED DESCRIPTION FIG. 1 shows a portafilter assembly 10. The portafilter assembly 10 has a portafilter 20 and a filter (filter basket) 30. The portafilter 20 consists of a body 23 or a portafilter body and a handle 21. An outlet 22 is located on the body 23. The body 23 defines a space into which the filter 30 is introduced. The filter 30 is usually cylindrical. A circumferential side wall laterally delimits a receiving volume 31. The side wall has an inner surface 32 and the inner surface 32 encloses the receiving volume 31. The filter 30 further has a collar or a widening 33. The collar 33 extends circumferentially at an upper opening of the receiving volume 31. The filter 30 is introduced into the portafilter 20. The bottom of the filter 30 is provided with a plurality of small holes. Water under pressure is pressed into the receiving volume 31, flows through the ground coffee material and takes up flavors from the ground coffee material and leaves the receiving volume 31 through the holes in the bottom of the filter 30. The prepared coffee beverage flows out of the outlet 22. A portafilter assembly 10 as shown in FIG. 1 is known in connection with so-called portafilter machines. FIG. 2 shows a brew head assembly 40 with a portafilter assembly 10 coupled thereto. The portafilter assembly 10 is introduced into the brew head assembly 40, for example, by a rotational movement 24. When the rotational movement 24 is carried out, for example by rotating the portafilter assembly 10 on the handle 21, the portafilter assembly 10 simultaneously carries out a vertical movement 25 and is pressed in the direction of the brew head 50 and the shower 52. In the inserted state of the portafilter assembly 10, the shower 52 of the brew head 50 rests on the ground coffee material in the filter 30. Depending on the filling height of the ground coffee material in the filter 30, the brew head 50 is moved in the housing 42 in the direction of the arrow 25 of the vertical movement of the portafilter assembly 10. In some examples of the brew head assembly 40 described here, the brew head 50 is movably supported in the housing 42 and can thus react to different filling heights of the ground coffee material in the filter 30. This has the consequence that the brew head 50 is pressed onto the surface of the ground coffee material with a virtually constant force within a specific range. The mechanism of the brew head which serves to perform this function will now be described with reference to FIGS. 3 and 4. FIG. 3 shows a perspective view of a brew head assembly 40. The brew head assembly 40 has a housing 42. A suspension 44 and an elastic element 46 in the form of a compression spring are arranged in the housing 42. The brew head 50 is also arranged in the housing 42 and movably supported therein. The shower 52 is arranged on the underside of the brew head 50. The shower 52 emits heated water under pressure onto the ground coffee material located in the filter 30. The shower 52 is surrounded by an outer wall 53. A seal 54 is arranged circumferentially on the outer wall 53. When the portafilter assembly is connected to the brew head assembly, as shown in FIG. 2, the brew head 50 extends into the filter 30 and the seal 54 seals with the inner surface 32 of the filter 30. FIG. 4 shows a perspective view of the brew head assembly 40 from FIG. 3. A guide element 45 in the form of a pin and an elastic element 46 in the form of a compression spring are shown in the housing 42. Of course, the brew head assembly 40 can have more than one guide element and one elastic element, wherein only one guide element and one elastic element are shown in each case in FIG. 4. The brew head 50 is supported in the housing 42 in such a way that the brew head 50 can move in both directions along the direction of movement shown by the arrow 47. The compression spring 46 presses the brew head downwards. When a portafilter assembly is inserted into the brew head assembly, as shown in FIG. 2, the ground coffee material presses the brew head upwards counter to the force exerted by the compression spring 46. The pin 45 has a head which is arranged outside the housing 42. The longitudinal axis of the pin 45 runs along the direction of movement 47 of the brew head 50. The head of the pin arranged outside the housing 42 limits the downward movement of the brew head. The pin 45 extends through an opening in the housing 42. The pin 45 is configured in such a way that it limits a range of movement of the brew head 50. If the brew head 50 is pressed upwards, for example, an end face or a stop of the pin 45 hits the housing 42 at some point and stops the upward movement of the brew head 50. For reasons of clarity, FIG. 4 shows only a part of the mechanism for the movement of the brew head 50. As already described further above, the brew head assembly can have a plurality of guide elements and elastic elements which can be arranged spaced apart from one another on the brew head and the housing. Furthermore, the brew head assembly has a connection for a water hose through which the heated water under pressure is supplied to the brew head. This water hose is also not shown here for reasons of clarity, wherein the person skilled in the art, however, has knowledge through the available prior art as to how such a water hose is to be used and connected. FIG. 5 shows a cross-sectional illustration of a brew head assembly 40. The brew head 50 is supported in the housing 42 in such a way that the brew head 50 can perform a vertical movement. This vertical movement is made possible by guide elements 45 on which an elastic element 46 in the form of a compression spring is arranged in order to press the brew head 50 downwards from the upper wall of the housing 42. The brew head 50 is connected to the guide elements 45. When the brew head 50 moves vertically, the guide elements 45 move with respect to the upper wall of the housing 42 against the compressive force of the elastic elements 46. In FIG. 5, the brew head assembly 40 is shown in a first state in which the brew head 50 reaches its lowest point, that is to say is pressed at most in the direction of the coffee powder in the receiving volume 31 of the filter 30. This state can be seen in that a lower limit 48 of the guide elements 45 rests on the housing 42 and a further movement of the brew head in the direction to the filter 30 is thus prevented. The shower 52 of the brew head 50 rests on the coffee powder in the filter 30. Furthermore, it can be seen in FIG. 5 that the seal 54, which runs circumferentially on a lateral surface of the brew head 50, lies against the inner surface of the filter 30 and seals the receiving volume 31. A heating element 80 is arranged on the rear side of the brew head 50, that is to say on the surface of the brew head 50 opposite the shower 52. The heating element 80 abuts evenly on the rear side of the brew head 50 and is in direct thermal contact with the brew head 50. The heating element 80 can be heated by supplying electrical energy and thus gives off thermal energy to the brew head 50. The water which flows through the brew head 50 and the shower 52 via the water line 41 thus loses less thermal energy. In the ideal case the brew head 50 is heated by the heating element 80 to the temperature of the hot water for the coffee preparation so that there is no temperature difference between hot water and brew head. The brew head assembly has a control unit 70. The control unit 70 can be part of the brew head assembly 40 or the coffee machine which contains the brew head assembly 40. The control unit 70 is coupled to a temperature detection unit 85. The temperature detection unit 85 is thermally coupled to the brew head 50 in order to detect a temperature of the brew head 50. The temperature detection unit 85 transmits a detected signal to the control unit 70. The detected signal corresponds to the current temperature of the brew head 50. Based on the current temperature of the brew head 50 and a predetermined temperature value, the control unit 70 determines the extent to which electrical energy has to be supplied to the heating element 80 so that the brew head 50 is heated to the predetermined temperature value. For this purpose, the control unit 70 can be coupled to an actuator for supplying electrical energy to the heating element 80 in order to selectively increase or reduce the quantity of electrical energy supplied to the heating element 80. FIG. 6 shows the brew head assembly from FIG. 5, but with the difference that the brew head 50 is in a different state than shown in FIG. 5. In FIG. 6, water under pressure is emitted from the brew head into the receiving volume 31 via the water line 41. The pressure of the water slightly raises the brew head 50, which can be seen in that the guide elements lie against the upper limit 49. A gap 55 is thus formed between the shower and the coffee powder in the receiving volume 31. This gap contributes to the water being distributed evenly over the surface of the coffee powder in the receiving volume 31. Irrespective of the position in which the brew head 50 is or whether the brew head 50 is moved along the intended direction of movement, the heating element 80 moves along with the brew head 50. The heating element 80 can thus supply thermal energy to the brew head 50 in any position. FIGS. 7 and 8 show an alternative embodiment of a brew head assembly 40. In this embodiment, the brew head 50 is not necessarily resiliently supported, but is pressed via a lever assembly 90 onto the coffee powder in the introduced portafilter assembly 10. Of course, it is also conceivable in this alternative embodiment that the brew head 50 is resiliently supported in the brew head assembly 40 in addition to the movement via the lever assembly 90 in order to adapt a pressure of the brew head 50 on the coffee powder in the portafilter assembly irrespective of a filling level of the filter with coffee powder. In FIG. 7, the heating element 80 is arranged abutting evenly on the rear side or upper side, respectively, of the brew head 50 in order to heat the brew head 50 to a desired temperature as described further above. In the position shown in FIG. 7, the brew head 50 does not rest on the coffee powder in the portafilter assembly 10. This can also be seen in that the lever assembly 90 is in an open state. Furthermore, in FIG. 7, the filter does not lie against the seal 54. FIG. 8 shows the embodiment from FIG. 7 in a closed state. The lever assembly 90 has been brought into the closed state, whereby the brew head 50 has been inserted into the filter of the portafilter assembly 10 and the collar of the filter lies against the seal 54. Also in the embodiment of FIGS. 7 and 8, the heating element 80 is arranged on the movable brew head 50 and thermally coupled thereto, as already described with reference to FIGS. 5 and 6. FIG. 9 schematically shows a coffee machine 100 having a brew head assembly 40. The brew head assembly 40 is in particular a brew head assembly 40 as shown in FIGS. 2 and 5 to 8 and having a brew head 50 as shown in FIGS. 3 and 4. Even though a movable brew head 50 has been described in FIGS. 3 to 8 and the 5 heating element 80 has been described in connection with a movable brew head 50, it is explicitly to be noted that the heating element 80 does not necessarily have to be used with a movable brew head 50, but rather can also be used with a static brew head 50 which is not movable with respect to the brew head assembly 40. 10 In addition, it is to be noted that “comprising” or “comprising” does not exclude any other elements or steps and “a” or “an” does not exclude a plurality. Furthermore, it is to be noted that features or steps which have been described with reference to one of the above exemplary embodiments can also be used in combination with 15 other features or steps of other exemplary embodiments described above. Reference signs in the claims are not to be regarded as a restriction. Reference signs 10 portafilter assembly 20 portafilter 21 handle 22 outlet 23 body 24 rotational movement 25 pressing direction, vertical movement 30 filter (filter basket) 31 receiving volume 32 inner surface 33 collar, widening 40 brew head assembly 41 water line 42 housing 44 suspension 45 guide element, pin 46 elastic element, spring 47 direction of movement, spring travel 48 lower limit 49 upper limit 50 brew head 52 shower 53 outer wall 54 seal 55 gap 70 control unit 80 heating element 85 temperature detection unit 90 lever assembly 100 coffee machine
Claims
1. A brew head assembly (40) for a coffee machine (100), the brew head assembly (40) comprising:a brew head (50) having a shower (52);a heating element (80);wherein the heating element (80) is arranged on the brew head (50) and is configured to heat the brew head (50) before and / or during a process of producing a coffee beverage.
2. The brew head assembly (40) according to claim 1,wherein the heating element (80) is arranged on the brew head (50) on a rear side of the brew head (50) opposite the shower (52).
3. The brew head assembly (40) according to claim 1 or 2,wherein the heating element (80) abuts evenly against the brew head (50).
4. The brew head assembly (40) according to one of the preceding claims, wherein the heating element (80) is an electric heating element.
5. The brew head assembly (40) according to one of the preceding claims, further comprising a temperature detection unit (85) thermally coupled to the brew head (50) and configured to detect a temperature of the brew head (50).
6. The brew head assembly (40) according to one of the preceding claims,wherein the brew head (50) is movably supported in the brew head assembly (40) in such a way that the brew head (50) can be moved within a predetermined range of movement along a direction of movement (47);wherein the direction of movement (47) contains a vertical directional component corresponding to a pressing direction (25) of a portafilter assembly (10) against the brew head (50).
7. The brew head assembly (40) according to claim 6,wherein the brew head assembly (40) has a suspension (44) which movably holds the brew head (50) in a housing (42) of the brew head assembly (40);wherein the suspension (44) has a guide element (45) and an elastic element (46);wherein the guide element (45) is coupled to the brew head (50) and is arranged to guide the brew head (50) in the housing (42) along the direction of movement (47);wherein the elastic element (46) is arranged between the brew head (50) and the housing (42) of the brew head assembly (40) to exert a force on the brew head (50) in the direction of the vertical directional component.
8. The brew head assembly (40) according to claim 7,wherein the elastic element (46) is a compression spring.
9. A coffee machine (100) with a brew head assembly (40) according to one of the preceding claims.
10. The coffee machine (100) according to claim 9,further comprising a portafilter assembly (10) with a filter (30);wherein the portafilter assembly (10) can be selectively inserted into and removed from the brew head assembly (40);wherein the brew head assembly (40) is configured such that, in an inserted state of the portafilter assembly (10), the shower (52) of the brew head (50) extends into a receiving volume (31) of the filter (30) and rests on the ground coffee material.