DEVICE FOR FEEDING COFFEE POWDER INTO A BREWING CHAMBER OF A COFFEE MACHINE

Abstract

The invention relates to a device for feeding coffee powder (a) into a brewing chamber of a coffee machine, comprising a brewing chamber container (1) having a filling opening (2) for receiving and brewing the coffee powder (a) and a feeding apparatus (3) for feeding the coffee powder (a) into the brewing chamber container (1) through the filling opening (2). By means of a shaking apparatus (4), which is coupled to the brewing chamber container (1), the brewing chamber container (1) is set vibrating during and/or after the filling with coffee powder. As a result, the coffee powder put into the brewing chamber container is compressed and evened out and, in particular, the coffee powder is prevented from piling up in the form of hills as the coffee powder is put into the brewing chamber container

Claims

1. Device for feeding coffee powder (a) into a brewing chamber of a coffee machine, comprising a brewing chamber container (1), having a filling opening (2), for receiving and brewing the coffee powder (a) and a feeding apparatus (3) for feeding the coffee powder (a) through the filling opening (2) into the brewing chamber container (1), characterized by a shaking apparatus (4) which is coupled to the brewing chamber container (1) in order to cause the brewing chamber container (1) to vibrate during and/or after the filling with coffee powder.

2. Device according to claim 1, characterized in that the feeding apparatus (3) has a feeding element (5), in particular in the form of a funnel or filling tube, which is decoupled from the brewing chamber container (1) and via which the coffee powder (a) can be introduced into the brewing chamber container (1) through the filling opening (2).

3. Device according to claim 1, characterized in that the brewing chamber container (1) is cylindrical and that the shaking apparatus (4) causes the brewing chamber container (1) to vibrate in the axial direction or in the radial direction during the introduction of coffee powder (a).

4. Device according to claim 1, characterized in that the brewing chamber container (1) is cylindrical and that the shaking apparatus (4) causes the brewing chamber container (1) to vibrate both in the axial direction and in the radial direction during the introduction of coffee powder (a).

5. Device according to claim 1, characterized in that the shaking apparatus (4) is coupled to a control unit, wherein the shaking apparatus (4) is controlled by the control unit in such a way that it causes the brewing chamber container (1) to vibrate while the feeding apparatus (4) conducts coffee powder (a) into the brewing chamber container (1) and/or after the brewing chamber container (1) has been filled with coffee powder.

6. Device according to claim 1, characterized in that the amplitude (A) and/or the frequency (f) of the shaking movement transferred by the shaking apparatus (4) to the brewing chamber container (1) can be adjusted via a control unit.

7. Device according to claim 1, characterized in that the brewing chamber container (1) has an outlet opening (6) which is opposite the filling opening (2) and through which the used coffee powder can be ejected after brewing of the coffee powder.

8. Device according to claim 7, characterized in that a movable first tamper (7) can be inserted into and removed from the outlet opening (6), wherein the first tamper (7) forms a bottom in the brewing chamber container (1) when in the inserted position.

9. Device according to claim 1, characterized in that a movable second tamper (7) can be inserted into the filling opening (2), wherein the second tamper (8) is coupled to a control unit which presses the second tamper (8) into the filling opening (2) after a predetermined amount of coffee powder (a) has been introduced into the brewing chamber container (1), in order to compress the introduced coffee powder (a) by means of the second tamper (8).

10. Device according to claim 1, characterized in that the brewing chamber container (1) has a coffee outlet through which the coffee produced in the brewing chamber container (1) by brewing the coffee powder with hot water can flow out of the brewing chamber.

11. Device according to claim 1, characterized in that the feeding apparatus (3) is coupled to a grinding apparatus, wherein the grinding apparatus produces the coffee powder (a) by grinding coffee beans.

12. Device according to claim 1, characterized in that the shaking apparatus (4) comprises an electrically driven motor, in particular an eccentric or an unbalance motor.

13. Device according to claim 1, characterized in that the shaking apparatus (4) comprises an alternating and rotationally reciprocating shaft (11), wherein the shaft (11) is connected to the brewing chamber container (1) in order to transfer the movements of the shaft (11) to the brewing chamber container (1).

14. Device according to claim 13, characterized in that the shaft (11) is movable in the axial direction, in particular in periodic axial movements, wherein the axial movements of the shaft (11) are transferred to the brewing chamber container (1).

15. Device according to claim 1, characterized in that the shaking apparatus (4) causes the brewing chamber container (1) to vibrate in two mutually orthogonal directions, in particular in the axial direction of the brewing chamber container (1) and perpendicularly thereto, during and/or after the introduction of coffee powder (a).

16. Device according to claim 2, characterized in that the feeding element (5) of the feeding apparatus (3) and the brewing chamber container (1) can be pivoted relative to one another.

17. Device according to claim 2, characterized in that the brewing chamber container (1) can be pivoted relative to the stationary feeding element (5), wherein a pivoting movement of the brewing chamber container (1) can be triggered by the shaking apparatus (4).

Description

[0018] These and other advantages and features of the invention will be apparent from the exemplary embodiment described in more detail below with reference to the accompanying drawings. In the drawings:

[0019] FIG. 1: shows a schematic diagram of a device according to the invention for feeding coffee powder into a brewing chamber of a coffee machine, the device being shown in

[0020] FIG. 1a during introduction of the coffee powder into a brewing chamber container of the brewing chamber,

[0021] FIG. 1b showing the brewing chamber container coupled to a shaking apparatus during the introduction of the coffee powder, and

[0022] FIG. 1c showing the brewing chamber container during compression of the introduced coffee powder with a tamper insertable into the brewing chamber container;

[0023] FIG. 2: shows a diagram of an exemplary embodiment for coupling a shaking apparatus to the brewing chamber container of a device according to the invention,

[0024] FIG. 2a showing the device in a side view, and

[0025] FIG. 2b showing the device in view from above.

[0026] FIG. 1 shows a device according to the invention for feeding coffee powder into a brewing chamber of a coffee machine. The brewing chamber can be a brewing chamber integrated into a coffee machine, for example a fully automatic coffee machine. However, the brewing chamber can also be designed as a portafilter of a portafilter machine for the production of espresso.

[0027] The exemplary embodiment shown in FIG. 1 is a brewing chamber which is integrated or can be integrated into a fully automatic coffee machine and has a brewing chamber container 1 in the form of a tube section with an upper filling opening 2 and an outlet opening 6 opposite thereto. Inserted into the outlet opening 6 is a movable tamper 7 which, in its inserted position shown in FIG. 1, forms a bottom of the brewing chamber container 1. Seals 9 are provided for sealing the bottom relative to the tubular wall of the brewing chamber container 1. A feeding element 5 of a feeding apparatus 3 for feeding the coffee powder a is arranged above the filling opening 2. The feeding element 5 can be a funnel, as indicated in FIG. 1a. The feeding element can also be designed as a filling tube or filling hose. The feeding apparatus 3 is connected via a connecting line 10 to a grinding apparatus not shown here. The grinding apparatus can be a mill integrated into the coffee machine for grinding coffee beans. The coffee powder produced by the grinding apparatus is conducted through the feed line 10 and the feeding element 5 through the filling opening 2 into the brewing chamber container 1, the coffee powder a trickling out of the feeding element 5 and into the brewing chamber container 1 due to gravity. In the process, a heap of coffee powder a is formed as indicated in FIG. 1a.

[0028] In order to prevent the coffee powder a introduced into the brewing chamber container 1 from accumulating in the form of a coffee powder heap, a shaking apparatus 4 is mechanically coupled to the brewing chamber container 1 in the device according to the invention. The shaking apparatus can be, for example, an electrically driven eccentric or an electric unbalance motor, which drives an unbalanced mass in the motor. The shaking apparatus 4 generates shaking movements with a predetermined amplitude A and a predetermined frequency f. These shaking movements are transferred to the brewing chamber container 1 by the mechanical coupling of the shaking apparatus the shaking apparatus 4, which is indicated in FIG. 1b by the arrow shown between the shaking apparatus 4 and the brewing chamber container 1. Owing to the transfer of the shaking movements of the shaking apparatus 4 to the brewing chamber container 1, the brewing chamber container 1 also executes vibrations at the predetermined amplitude A and the predetermined frequency f.

[0029] In expedient exemplary embodiments, the shaking movement can be transferred to the brewing chamber container either in the radial direction of the brewing chamber container 1 or else in the axial direction of the brewing chamber container 1. The shaking movements of the shaking apparatus 4 are particularly preferably transferred to the brewing chamber container 1 in two mutually orthogonal directions, that is to say for example in the radial and axial direction of the cylindrical brewing chamber container 1.

[0030] In order to control the shaking movements transferred from the shaking apparatus 4 to the brewing chamber container 1, the electrically driven motor of the shaking apparatus 4 is coupled to a control unit. In this case, the control unit can expediently be the central control unit of the coffee machine. The amplitude and the frequency of the shaking movements are controlled via this control unit. The control unit preferably comprises an operator interface via which an operator of the coffee machine can input the desired amplitude A and the desired frequency f of the shaking movements or select them from a series of predetermined values. The control unit controls the shaking apparatus 4 in accordance with the input values for the amplitude A and the frequency f.

[0031] The control unit is expediently configured in such a way that the shaking apparatus 4 is put into operation during the introduction of coffee powder a into the brewing chamber container 1 by means of the feeding apparatus 3 and is switched off after completion of the filling process. However, it is also possible for the shaking apparatus 4 to be put into operation only after the completion of the filling process in order to cause the brewing chamber container 1 coupled to the shaking apparatus 4 to vibrate. Due to the vibrations transferred to the brewing chamber container 1, the coffee powder a is evenly distributed in the brewing chamber container 1 either already during the filling process and/or after the filling process, resulting in a flat, horizontal leveling of the coffee powder a in the brewing chamber container 1, as shown in FIG. 1b.

[0032] After the introduction and the evening out of the introduced amount of the coffee powder a into the brewing chamber container 1, a second tamper 8 is pressed from above through the filling opening 2 into the brewing chamber container 1 in order to compress the introduced amount of coffee powder a. In order that the feeding apparatus 3 does not impede the insertion movement of the second tamper 8 into the brewing chamber container 1, the feeding apparatus 3 is pivotable so that the feeding apparatus 3 can be pivoted away from the filling opening 2 when the second tamper 8 is inserted into the brewing chamber container 1.

[0033] A feed line, not shown here, for feeding hot water is arranged in the second tamper 8. After the coffee powder a has been compressed, hot water is conducted into the brewing chamber container 1 via this feed line in order to brew the introduced coffee powder a. The coffee beverage produced thereby can flow out of the brewing chamber container 1 through a coffee outlet, also not shown here, and be poured into a cup.

[0034] After completion of the brewing process and removal of the coffee beverage produced thereby, the lower, first tamper 7 is moved out of the brewing chamber container 1, and the wet coffee powder cake of the used coffee powder located in the brewing chamber container 1 can be pressed downward out of the outlet opening 6 by a further movement of the upper, second tamper 8 in order to clear the brewing chamber for the next brewing process for producing a coffee beverage.

[0035] Thereafter, the bottom of the brewing chamber container 1 is closed again by inserting the (lower) first tamper 7 into the outlet opening 6 of the brewing chamber container 1 so that a predetermined amount of coffee powder can be metered into the brewing chamber container 1 again and evenly compressed in the manner described above for the next brewing process.

[0036] In order to ensure that the entire amount of coffee powder provided by the grinding apparatus can be conducted without loss via the feeding apparatus 3 into the brewing chamber container 1, the feeding element 5 is preferably mechanically decoupled from the brewing chamber container 1. This ensures that, during operation of the shaking apparatus 4, the vibrations are only transferred to the brewing chamber container 1 but not to the feeding element 5 or the feeding apparatus 3.

[0037] The shaking movements transferred by the shaking apparatus 4 during and/or after the introduction of the coffee powder a into the brewing chamber container 1 lead to an even distribution of the introduced amount of the coffee powder a in the brewing chamber container 1 and ensure a largely flat, horizontal surface of the introduced amount of coffee powder. As a result, when the introduced coffee powder a is subsequently compressed by the upper, second tamper 8, an even and homogeneous compression of the coffee powder a in the brewing chamber container 1 can be ensured. The introduced and compressed coffee powder has a homogeneous density distribution over the entire volume of the introduced coffee powder. The most homogeneous distribution possible and the most even density possible of the introduced amount of coffee powder has a positive influence on the quality of the coffee beverage produced since the largest possible effective brewing volume can be utilized when brewing the coffee powder distributed evenly in the brewing chamber container 1.

[0038] The desired homogeneous distribution of the coffee powder in the brewing chamber container 1 can be adapted to the properties of the coffee powder used, such as its grinding or roasting degree, by the preferably enabled adjustment of the amplitude and/or the frequency of the shaking movements which are transferred from the shaking apparatus 4 to the brewing chamber container 1. The properties of the coffee powder likewise have a considerable influence on the quality and the taste of the coffee beverage produced, which can still be optimized using a device according to the invention.

[0039] FIG. 2 shows an exemplary embodiment for coupling a shaking apparatus 4 to a brewing chamber container 1. The shaking apparatus 4 comprises a shaft 11 which is rotatably mounted in a sleeve-shaped bearing housing 12 and is coupled to a motor not shown here. The shaft 11 can be caused to rotate via the motor and/or displaced axially in the bearing housing 12. In particular, the motor can transfer alternating rotational movements, that is to say reciprocating movements, for generating shaking movements, to the shaft 11. At the lower end of the shaft 11 there is a connecting part 14 which connects the shaft 11 to the lower tamper 7. In the position shown in FIG. 2a, the lower tamper 7 is inserted into the outlet opening 6 in order to form a bottom of the brewing chamber container 1. Radially projecting flanges 13 are arranged on the outer circumference of the brewing chamber container 1 and surround the bearing housing 12 and are mounted in a rotationally movable manner on the outer circumference of the bearing housing 12.

[0040] The shaft 11 can expediently be both rotated and displaced upward and downward in the axial direction in the stationary bearing housing 12. The motor coupled to the shaft 11 is preferably actuated by a control unit in such a way that it can trigger both periodic rotational movements in the form of reciprocating movements and axial displacements of the shaft 11 relative to the bearing bushing 12.

[0041] In the case of a transfer of reciprocating rotational movements of the shaft 11 relative to the stationary bearing bushing 12, the rotational movements of the shaft 11 are transferred as vibrational movements to the brewing chamber container 1 via the connecting part 14. The brewing chamber container 1 is caused to vibrate thereby. An axial movement of the shaft 11 in the bearing bushing 12 is also transferred to the brewing chamber container 1 via the connecting part 14. When the shaft 11 is alternately periodically moved upward and downward in the axial direction, this movement of the shaft 11 is transferred to the brewing chamber container 1 as an axial vibrational movement.

[0042] FIG. 2b shows the periodic rotational movements that can be transferred from the shaking apparatus 4 to the brewing chamber container 1 within a rotational angle R.

[0043] In the embodiment of a device according to the invention shown in FIG. 2, the coupling of the lower tamper 7 via the connecting part 14 to the shaft 11 can also be used to move the lower tamper 7 into the outlet opening 6 and out of the outlet opening 6. In order to move the lower tamper 7 out of the outlet opening 6 of the brewing chamber container 1, the shaft 11 can be displaced downward in the bearing bushing 12 in the axial direction. In order to move the tamper 7 moved out of the outlet opening 6 and away from the outlet opening 6, the shaft 11 can then be rotated by a predetermined angle. In this case, the rotational angle is expediently adjusted to be large enough for the removed tamper 7 to be pivoted completely away from the outlet opening 6. By pivoting away the lower tamper 7, the coffee powder cake of used coffee powder a located in the brewing chamber container 1 after completion of a brewing process can be ejected from the brewing chamber container 1 without any impediment by means of the upper tamper 8.