Coffee grinding machine and related method configured to provide a quantity of layered ground coffee.

Abstract

To provide a coffee grinding machine which can properly change the functional characteristics of espresso coffee obtained through a ground product.SOLUTION: There is disclosed a coffee grinding machine for grinding coffee beans and forming a dose of ground coffee in a filter basket with a bottom layer of ground coffee having a first mean particle size and an adjacent layer of ground coffee having a second mean particle size. The coffee grinding machine comprises: grinding members for grinding coffee beans; an electric motor 2 for causing rotation of at least one grinding member with respect to another grinding member; and a device configured to cause, during grinding of coffee beans for forming dose, a variation of rotation speed of said electric motor between a first speed and a second speed, wherein either said second mean particle size is smaller than said first mean particle size and said first speed is greater than said second speed or said second mean particle size is greater than said first mean particle size and said first speed is lower than said second speed.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a coffee bean grinding machine. The coffee bean grinding machine can be a separate machine or can be incorporated into a coffee-based beverage manufacturing machine. Also, such a machine is simply known as a "coffee grinder", "coffee mill" or "mill". More specifically, the present invention relates to a coffee grinding machine configured to provide a suitable dosage of layered ground coffee. Moreover, such a machine can be a separate machine or can be incorporated into a coffee-based beverage manufacturing machine. Also, such a machine is simply known as a "coffee grinder", "coffee mill" or "mill". More specifically, the present invention relates to a coffee grinding machine configured to provide a suitable dosage of layered ground coffee. Moreover, such a machine is simply known as a "coffee grinder", "coffee mill" or "mill". More specifically, the present invention relates to a coffee grinding machine configured to provide a suitable dosage of layered ground coffee. Moreover, such a machine is simply known as a "coffee grinder", "coffee mill" or "mill". More specifically, the present invention relates to a coffee grinding machine configured to provide a suitable dosage of layered ground coffee. Moreover, such a machine is simply known as a "coffee grinder", "coffee mill" or "mill". More specifically, the present invention relates to a coffee grinding machine configured to provide a suitable dosage of layered ground coffee.

Background Art

[0002] As is known, for the preparation of espresso coffee, a certain amount of ground coffee, usually called a "dosage", is used. The dosage can be a single dosage, a double dosage or a multiple dosage. The dosage of ground coffee is typically placed in a filter basket in the form of a cup with an open top and a micro-perforated bottom. Typically, the dosage of coffee is compressed in the filter basket to form a coffee powder pack. Next, the filter is supported by a portafilter configured to removably engage within the discharge unit of an espresso coffee machine. Espresso coffee is obtained by passing hot water through the coffee powder pack under pressure. As is known, for the preparation of espresso coffee, a certain amount of ground coffee, usually called a "dosage", is used. The dosage can be a single dosage, a double dosage or a multiple dosage. The dosage of ground coffee is typically placed in a filter basket in the form of a cup with an open top and a micro-perforated bottom. Typically, the dosage of coffee is compressed in the filter basket to form a coffee powder pack. Next, the filter is supported by a portafilter configured to removably engage within the discharge unit of an espresso coffee machine. Espresso coffee is obtained by passing hot water through the coffee powder pack under pressure. As is known, for the preparation of espresso coffee, a certain amount of ground coffee, usually called a "dosage", is used. The dosage can be a single dosage, a double dosage or a multiple dosage. The dosage of ground coffee is typically placed in a filter basket in the form of a cup with an open top and a micro-perforated bottom. Typically, the dosage of coffee is compressed in the filter basket to form a coffee powder pack. Next, the filter is supported by a portafilter configured to removably engage within the discharge unit of an espresso coffee machine. Espresso coffee is obtained by passing hot water through the coffee powder pack under pressure. As is known, for the preparation of espresso coffee, a certain amount of ground coffee, usually called a "dosage", is used. The dosage can be a single dosage, a double dosage or a multiple dosage. The dosage of ground coffee is typically placed in a filter basket in the form of a cup with an open top and a micro-perforated bottom. Typically, the dosage of coffee is compressed in the filter basket to form a coffee powder pack. Next, the filter is supported by a portafilter configured to removably engage within the discharge unit of an espresso coffee machine. Espresso coffee is obtained by passing hot water through the coffee powder pack under pressure. As is known, for the preparation of espresso coffee, a certain amount of ground coffee, usually called a "dosage", is used. The dosage can be a single dosage, a double dosage or a multiple dosage. The dosage of ground coffee is typically placed in a filter basket in the form of a cup with an open top and a micro-perforated bottom. Typically, the dosage of coffee is compressed in the filter basket to form a coffee powder pack. Next, the filter is supported by a portafilter configured to removably engage within the discharge unit of an espresso coffee machine. Espresso coffee is obtained by passing hot water through the coffee powder pack under pressure. As is known, for the preparation of espresso coffee, a certain amount of ground coffee, usually called a "dosage", is used. The dosage can be a single dosage, a double dosage or a multiple dosage. The dosage of ground coffee is typically placed in a filter basket in the form of a cup with an open top and a micro-perforated bottom. Typically, the dosage of coffee is compressed in the filter basket to form a coffee powder pack. Next, the filter is supported by a portafilter configured to removably engage within the discharge unit of an espresso coffee machine. Espresso coffee is obtained by passing hot water through the coffee powder pack under pressure. As is known, for the preparation of espresso coffee, a certain amount of ground coffee, usually called a "dosage", is used. The dosage can be a single dosage, a double dosage or a multiple dosage. The dosage of ground coffee is typically placed in a filter basket in the form of a cup with an open top and a micro-perforated bottom. Typically, the dosage of coffee is compressed in the filter basket to form a coffee powder pack. Next, the filter is supported by a portafilter configured to removably engage within the discharge unit of an espresso coffee machine. Espresso coffee is obtained by passing hot water through the coffee powder pack under pressure. As is known, for the preparation of espresso coffee, a certain amount of ground coffee, usually called a "dosage", is used. The dosage can be a single dosage, a double dosage or a multiple dosage. The dosage of ground coffee is typically placed in a filter basket in the form of a cup with an open top and a micro-perforated bottom. Typically, the dosage of coffee is compressed in the filter basket to form a coffee powder pack. Next, the filter is supported by a portafilter configured to removably engage within the discharge unit of an espresso coffee machine. Espresso coffee is obtained by passing hot water through the coffee powder pack under pressure.

[0003] A coffee grinding machine is used to obtain coffee powder. In known coffee grinding machines, coffee beans are ground by passing through a grinding member. Flat, conical or cylindrical grinding members are known. Typically, the grinding member of a coffee grinding machine comprises a fixed member and a member that rotates relative to the fixed member. For example, in a coffee grinder having a conical grinder A coffee grinding machine is used to obtain coffee powder. In known coffee grinding machines, coffee beans are ground by passing through a grinding member. Flat, conical or cylindrical grinding members are known. Typically, the grinding member of a coffee grinding machine comprises a fixed member and a member that rotates relative to the fixed member. For example, in a coffee grinder having a conical grinder A coffee grinding machine is used to obtain coffee powder. In known coffee grinding machines, coffee beans are ground by passing through a grinding member. Flat, conical or cylindrical grinding members are known. Typically, the grinding member of a coffee grinding machine comprises a fixed member and a member that rotates relative to the fixed member. For example, in a coffee grinder having a conical grinder A coffee grinding machine is used to obtain coffee powder. In known coffee grinding machines, coffee beans are ground by passing through a grinding member. Flat, conical or cylindrical grinding members are known. Typically, the grinding member of a coffee grinding machine comprises a fixed member and a member that rotates relative to the fixed member. For example, in a coffee grinder having a conical grinder One grinder remains stationary, while the other grinder rotates using a motor. Some coffee grinding machines change the distance between the grinders to alter the particle size of the coffee grounds. There are some things that can be corrected.

[0004] Patent Document 1 discloses a variable-speed coffee grinder.

[0005] Patent document 2 discloses a coffee grinder, in particular, for an automatic coffee machine.

[0006] Patent document 3 discloses a coffee grinder with variable speed.

[0007] Patent Document 4 discloses a device for setting the spacing between the grinding elements of a grinder.

[0008] Patent document 5 discloses a grinding device that adjusts the rotational speed. [Prior art documents] [Patent Documents]

[0009] [Patent Document 1] U.S. Patent Application Publication No. 2016 / 220067 [Patent Document 2] European Patent Application Publication No. 2810592 [Patent Document 3] International Publication No. 2017 / 055433 [Patent Document 4] German Patent Application Publication No. 3503011 [Patent Document 5] Chinese Patent Application Publication No. 107692874 Specification [Overview of the project] [Problems that the invention aims to solve]

[0010] The applicant conducted experiments related to ground coffee powder. For the purposes of the present invention, It is contemplated that the coffee powder is substantially formed by particles or granules having a theoretical characteristic size. Also, this theoretical characteristic size is hereinafter referred to in this specification by the term "equivalent diameter". Furthermore, the abbreviation "ground product" can be used in place of the more complete term "ground coffee powder" or other similar expressions.

[0011] The Applicant has understood that all known coffee grinding machines produce a ground product containing granules of greatly different sizes, regardless of the manufacturer and regardless of the type of grinding member or the particular mechanism used. The range of equivalent diameters extends over three orders of magnitude from a few microns to over 1 millimeter.

[0012] A relatively large number of granules can be represented as a specific profile called a "particle size profile" or "particle size curve", which behaves in the same way as shown in Figure 1 (regardless of the coffee grinding machine used).

[0013] The curve showing the particle size profile is called a bimodal profile. The high peak (on the right) is called the "first mode" and the low peak (on the left) is called the "second mode".

[0014] As briefly described above, the purpose of the ground coffee is to be used in an espresso coffee machine that dispenses a coffee beverage.

[0015] As is clear, a particle size with a large number of fine particles results in less water flow compared to a particle size with a large number of large particles, and thus the coffee obtained during the same dispensing time is "poorer".

[0016] ​​​​​​​​Typically, each bartender adjusts their coffee grinder to their liking. To obtain the optimal particle size for producing the beverage.

[0017] A machine having a flat grinder, a conical grinder, or a cylindrical grinder. However, the smaller the distance between the crushing members, the greater the number of fine particles and the smaller the number of large particles. The greater the distance between the grinding members, the more the opposite result occurs (i.e., the number of fine particles decreases). (This results in a larger number of large particles.)

[0018] Typically, bartenders adjust the grinding settings each time they change the coffee beans they put into the hopper before grinding. Adjust the coffee. The coffee may change if a different brand or a different bag of the same brand is used. be.

[0019] The purpose defined by the applicant is to provide a coffee grinder that responds to changes in the ground coffee. It means to reduce the degree.

[0020] Another objective set forth by the applicant is the sensory characteristics of espresso coffee obtained through the grinding process. The objective is to provide a coffee grinding machine that can appropriately change the properties of the coffee.

[0021] According to the applicant, the above objective is to be able to change the particle size curve during the grinding of coffee dosage. This is achieved by a grinding machine.

[0022] Paragraph

[0019] of the specification of U.S. Patent Application Publication No. 2016 / 220067: Therefore, a coffee grinder with a variable speed motor can operate at a lower speed than a conventional high-speed grinder. They state that it can grind coffee into a finer powder more accurately and consistently. Espresso coffee In different coffee brewing methods, such as the one described above, the coffee beans are distributed into uniform particles. It is necessary to set it. With conventional high-speed coffee grinders, especially when the motor starts up... When the particle size is uneven, there is a tendency to grind the coffee beans rather than cut them.

[0023] U.S. Patent Application Publication No. 2016 / 220067 describes how to quickly process powder when precision is not required. While maintaining the crushing ability, the speed and starting torque characteristics are controlled via a programmable control device. A variable-speed motor that can be adjusted to accommodate various coffee preparation methods or types of coffee beans. The document discloses a coffee grinder that uses [a specific component / technology].

[0024] In contrast to the above teaching, the present invention provides a different filter bus with layers having different average sizes. The purpose is to directly provide the amount of ground coffee within the container. [Means for solving the problem]

[0025] According to the first embodiment, coffee beans are ground, and the most ground coffee having a first average particle size A filter basket having a lower layer and an adjacent layer of ground coffee having a second average particle size. A coffee grinding machine is provided that forms the amount of ground coffee inside, and the coffee grinding machine teeth, • A grinding component for grinding coffee beans, • An electric motor that rotates at least one grinding member relative to another grinding member, • During the grinding of coffee beans to form a dose, the rotational speed of the electric motor is set to a first speed. The device comprises a device configured to change between a first and second speed, The second average particle size is smaller than the first average particle size, and the first velocity is the second Greater than the speed, or The second average particle size is larger than the first average particle size, and the first velocity is greater than the second It is either less than the speed or something else.

[0026] An adjacent layer is a layer adjacent to the first layer and located above the first layer. The first layer is (ground coffee (It is initially generated so that it essentially rests on the bottom of the filter basket), and the adjacent layers are opposite The corresponding ground coffee is produced immediately after the first layer so that it lies on top of the first layer. One or more layers may be provided, and the one or more layers are made of ground coffee in the adjacent layers. It has ground coffee granules with an average size that differs from the average size of the other granules.

[0027] According to the embodiment, the coffee grinding machine controls the rotation speed of the grinding member relative to other grinding members. The speed change device further comprises a tachometer for counting, and the grinding member and the other grinding section The system is configured to change the speed from a first speed to a second speed according to the relative rotation speed of the material. It will be done.

[0028] The set relative rotation speed can be any number, either an integer or a decimal number. Preferably, The set relative rotation speed is a function of the total set time for grinding the dose, or for grinding the dose. It is calculated as a function of the total number of rotations for. In addition, preferably, the set relative number of rotations is the dose It is calculated as a function of the total number of layers in the structure.

[0029] The first speed is the speed the motor reaches after a threshold rotational speed calculated from the motor's startup. It should be noted that such rotational speeds can be any number between approximately 0.5 and approximately 3.0. (For example, it can be set to approximately 0.5, 1.0, 1.5, 2.0, 2.5, and 3.0.)

[0030] For example, if the threshold rotation speed is set to 1.0, the total rotation speed is 5, and the total number of layers is 2, then the set phase The number of rotations can be set to 2. That is, the first velocity is reached during the first rotation, and this A first speed is maintained for two rotations, and then a second speed is maintained for the remaining two rotations. However, the grinding process is set so that the rotation speed of the first layer is different from the rotation speed of the first layer. It is also possible to have three or more layers.

[0031] According to one embodiment, the coffee grinding machine further comprises a timer, and the speed change device The speed is adjusted from the first speed to the second speed according to the set time calculated from the start of the electric motor. It is designed to change.

[0032] The setting time can be calculated as a function of the total setting time required to crush the dose. In addition, Alternatively, the set time can be calculated as a function of the total number of strata in the dose.

[0033] It is preferable to consider a threshold time. Such a threshold time is the time from motor startup to the first This is the time it takes to reach a certain speed. Such a threshold time is the total time required to break down the dose. It may be part of the embodiment. According to the embodiment, the threshold time is about 1 / 2 of the total time for crushing the dose. It can be approximately 7 to 1 / 4 of the total time required to break down the dose. For example, the threshold time is approximately 1 / of the total time required to break down the dose. It can be 6 to about 1 / 5. If the total time is about 6 seconds, the threshold time is about 1 second to about 1.2 seconds. It could be in between.

[0034] For example, if the total time is 6 seconds, the threshold time is 1 second, and the total number of layers is 2, then from motor startup to 3.5 A change from the first velocity to the second velocity can occur after a few seconds.

[0035] According to the embodiment, the coffee grinding machine weighs the amount of ground coffee to be calculated The device further comprises components, and the speed changing device is the second of the amount of coffee ground at the first speed. It is configured to change the velocity from a first velocity to a second velocity depending on the mass of part 1. ru.

[0036] In this case as well, preferably a threshold is taken into consideration, and the coffee dose is taken after the threshold time or threshold number of turns. The mass is calculated. The threshold time is, as mentioned above, part of the total time to crush the dose. This is possible. The threshold rotation speed is, as mentioned above, part of the total rotation speed for crushing the dose. It is possible.

[0037] The speed change device is configured to change the speed of the electric motor in steps or continuously. It is possible.

[0038] According to the embodiment, the coffee grinding machine is a speed pro for grinding a quantity of coffee. It also features an interface for selecting files.

[0039] According to one embodiment, the coffee grinding machine uses an encoder to detect the rotational speed of the electric motor. To further enhance the Da.

[0040] According to a second aspect of the present invention, the present invention grinds coffee beans to obtain a first average particle size. A fill having a bottom layer of coffee and an adjacent layer of ground coffee having a second average particle size. This provides a method for obtaining a quantity of ground coffee in a basket, and this method is (a) A step of providing a grinding member for grinding coffee beans, (b) A step of providing an electric motor that rotates one grinding member relative to another grinding member. and, (c) During grinding, rotate at least one of the grinding members at a first speed relative to the other grinding members. The steps include making it rotate at speed 2, The second average particle size is smaller than the first average particle size, and the first velocity is the second Greater than the speed, or The second average particle size is larger than the first average particle size, and the first velocity is greater than the second It is either less than the speed or something else.

[0041] According to embodiments, the present invention counts the rotational speed of a grinding member relative to other grinding members. Step and the speed is set according to the set relative rotation speed of the crushing member and the other crushing members. This further includes a step of changing the speed from a first speed to a second speed.

[0042] According to one embodiment, the present invention provides a speed that is determined according to a set time calculated from the start of the electric motor. The process further includes the step of changing the velocity from a first velocity to a second velocity.

[0043] According to embodiments, the present invention relates to a first portion of a coffee quantity ground at the first speed. The process further includes the step of varying the velocity from a first velocity to a second velocity depending on the mass of the object.

[0044] The aforementioned change in speed from the first starting speed to the second speed can be performed continuously or in steps. can.

[0045] According to the embodiment, a first speed and a second speed are used during the grinding of coffee beans to form a dose. Instead of a device configured to change the rotational speed of the electric motor between degrees, - The distance between one grinding member and another grinding member is changed during the grinding of coffee beans. An actuator can be provided that is configured to obtain a certain dosage.

[0046] The actuator continuously or incrementally changes the distance between the grinders during coffee bean grinding. It can be configured to obtain a quantity of ground coffee by processing it.

[0047] The distance between the grinders changes from a first distance to at least a second distance during the grinding of the dose. This can be done, and the first distance is smaller than the second distance, and the first particle size is A dose of ground coffee having at least a first portion and a dose of ground coffee having a second particle size The second part of and is obtained.

[0048] Furthermore, an advantage is that the coffee grinding machine has a speed profile for grinding a certain amount of coffee. It may include an interface for selecting a file or distance profile.

[0049] Furthermore, advantageously, the coffee grinding machine uses an encoder to detect the rotational speed of the electric motor. It can be equipped with.

[0050] In another embodiment, the rotation speed of the electric motor is changed during the grinding of coffee beans. Instead of obtaining a certain amount of coffee, the distance between the grinding members is changed during the grinding of the coffee beans to control the grinding process. Obtain the dose of -hee.

[0051] During the grinding of coffee beans, the distance between the grinders is changed continuously or in stages, and the grinding process is controlled. You can obtain the dose of He.

[0052] The distance between the grinders changes from a first distance to at least a second distance during the grinding of the dose. This can be done, and the first distance is smaller than the second distance, and the first particle size is A dose of ground coffee having at least a first portion and a dose of ground coffee having a second particle size The second part of and is obtained. [Brief explanation of the drawing]

[0053] [Figure 1] This graph shows an example of a particle size profile represented on a logarithmic scale. [Figure 2a] This is a schematic diagram showing the amount of ground coffee obtained with a standard particle size profile in a filter basket inserted into a portable filter. [Figure 2b] This is a schematic diagram of the amount of ground coffee obtained with a modified particle size profile according to the present invention in a filter basket inserted into a portable filter. [Figure 3] This is a graph of two uniformly scaled particle size profiles obtained at two different grinding rates. [Figure 4] This is a graph of two equally scaled particle size profiles. The first particle size profile was obtained at a constant rate, while the second particle size profile was obtained by combining pulverized material produced at two different rates. [Figure 5] This is a schematic diagram of a coffee grinding machine according to an embodiment of the present invention. [Figure 6] Figure 5 is an explanatory diagram of some of the machine's components. [Modes for carrying out the invention]

[0054] Herein, with reference to the attached drawings, a detailed description of the present invention is provided as a non-limiting example. The following is shown.

[0055] Figure 1, as briefly mentioned above, shows an example of the particle size profile of coffee powder by dosage. It is. The curve representing the particle size profile is called a bimodal profile. The high peak ( The one on the right (for larger particles) is called the "first mode," while the one with the lower peak... The one on the left (referring to smaller particles) is called the "second mode."

[0056] The applicant conducted research and, surprisingly, found that the first mode (the higher peak on the right side of Figure 1) A coffee grinder that can change the particle size curve to increase the amplitude of the bell corresponding to ) They found that this reduced the sensitivity of the coffee grinding machine. In other words, the first mode By increasing the amplitude, the particle size is adjusted when there is a change in the coffee in the hopper. The need to do so is reduced.

[0057] The applicant conducted further research and, surprisingly, found that the ground material could be placed in the filter basket. We discovered that this sensitivity can be further reduced by positioning it in a precise manner. In particular, by placing larger particles at the bottom and finer particles at the top, This demonstrated that better performance could be obtained.

[0058] The applicant has developed a coffee grinding machine that can change the particle size curve during the grinding of a dose. I realized that by reducing the sensitivity of the coffee grinder, I could achieve both objectives.

[0059] According to the first embodiment of the present invention, the coffee grinding machine comprises a grinding member, and the grinding member The distance is adjustable and changes during the grinding of the dosage. Preferably, the distance between the grinding members is Clutcher (e.g., electric motor or linear actuator, e.g., piston 8) and suitable It can be electrically adjusted by a precise control circuit.

[0060] In the coffee grinding machine according to the first embodiment, the distance between the grinding members (during grinding of the quantity) The grinding of dose D is performed by changing (stepwise or continuously), and the first broader mode It is possible to obtain the pulverized material. In fact, when the distance between the grinders is reduced, the first The mode moves toward finer particles, and as the distance increases, the first mode becomes It was found that they move towards larger particles.

[0061] Therefore, for example, by increasing the distance between the grinders, the first portion of the powder quantity is produced. And, a coffee grinding machine that reduces the distance between grinders to produce the remaining part, This will result in the production of a pulverized material with a wider bell than the first mode. Overall, starting from a specific distance between grinders, this distance is reduced during the grinding of the dose. This results in a pulverized material having a wider bell than the first mode.

[0062] The change in the distance between the grinders during grinding of dose F may be continuous or stepwise. In coffee grinding machines using a specific application method, for example, a larger distance is used to produce larger particles. A first layer of pulverized material to obtain the first layer, and a second layer to obtain finer particles using a smaller distance, It is also possible to provide a layer. Clearly, it is possible to obtain two or more layers, or as described above. During the grinding of dose D (1, 2, or multiple times), the distance between the grinders is continuously changed. By doing so, it is also possible to obtain continuous change.

[0063] The dose D shown in the figure is obtained by grinding the beans without changing the distance between the grinders. In Figure 2a, the distribution of the pulverized material within the filter is random and uncontrolled.

[0064] Figure 2b shows the distribution within the filter, which is properly controlled using the coffee machine according to the present invention. In particular, the bottom layer is characterized by particles that are larger on average, while the top layer is characterized by particles that are smaller on average. Characterized by the child. The bottom layer is the distance at which the grinder is positioned during the second part of the dosage grinding operation. This is achieved by keeping the grinder at a greater distance than the distance, where, on average, finer. A top layer containing particles is obtained.

[0065] According to another embodiment of the present invention, the coffee grinding machine changes the relative rotational speed of the grinding members. By transforming it, it is configured to change the particle size during the grinding of the dosage. The expression "rotation" is understood to mean that one component rotates relative to another component. Typically, one grinding element remains stationary while another grinding element rotates.

[0066] Figure 3 shows the effect of grinder rotation speed on particle size. In particular, Figure 3 shows the grinder Two types of grains: one obtained by keeping the distance between them constant, and another obtained by changing the rotational speed. The radius curve is shown. Unlike Figure 1, the curve in Figure 3 has a uniform scale, emphasizing the difference in the first mode. They are doing it.

[0067] As shown in the figure, at low speeds, the first mode is displaced to the left, the relative amount decreases, and the second mode It will be advantageous.

[0068] As the speed increases, the first mode shifts to the right, increasing the relative amount.

[0069] The change in speed is preferably achieved by a suitable electronic speed regulator of the electric motor. Many of these types of devices are commercially available, although their specifications vary depending on the type of motor used. According to one embodiment of the present invention, a coffee grinding machine includes a three-phase asynchronous motor and a speed control It comprises an inverter or any known frequency variator for that purpose.

[0070] According to one embodiment of the present invention, a coffee grinding machine has a variable speed (stepwise and / or continuous) The dosage is then crushed (continuously) to obtain a dosage of the crushed material having a wider first mode than usual.

[0071] In fact, as described above, when the rotation speed is reduced, the first mode moves to the left and rotates. When the speed is increased, the first mode moves to the right. Therefore, for example, the code according to the present invention The pulverizing machine is designed to dispense a portion of the powder at high speed and the other portion at low speed. This can be achieved. The dose obtained in this way, as a whole, is the Bell of the first mode. This will result in a wider range of particles being included.

[0072] Figure 4 is a graph showing a comparison of two particle size curves. In particular, this figure is obtained at a single velocity. The first particle size curve (dashed line) and the second particle size curve obtained at two different speeds are shown. The particle size curve obtained by combining the powders from two grinding operations performed at different speeds, however, Therefore, the curve that produces the same overall head loss as obtained by grinding at a constant speed is larger This shows the variance (large standard deviation).

[0073] According to the present invention, advantageously, for example, the first layer (bottom layer) of the pulverized material can be formed at a higher speed. By obtaining larger particles, a second layer (top layer) is formed at a slower speed to obtain even finer particles. It is possible to do so. The particles belonging to the continuous curve shown in Figure 3 are deposited in the first layer, but break Particles belonging to the linear curve will be deposited in the second layer. Clearly, the velocity is continuously changing. By doing so, it is possible to obtain three or more layers or continuous changes.

[0074] According to the applicant, increasing the amplitude of the bell corresponding to the first mode enhances the sensory side of the beverage. Change the surface. As is known, in practice, the particle size profile is the same for the same dispensing time, Therefore, the amount of beverage dispensed depends on the flow rate. In fact, coffee powder is "head damage" A "loss" or "pressure loss" occurs, which determines the flow rate of the beverage.

[0075] According to the present invention, instead of exceeding the limitations of known coffee grinding machines, the same head loss is achieved. This makes it possible to generate more particle size curves. For example, the two curves shown in Figure 4 are It is characterized by two different amplitudes of the bell for the first mode.

[0076] This is because the two curves shown in Figure 4 represent two different water molecules, even though the injection time is the same, due to the difference in particle size. This means that the contact area with the coffee grounds is different, and therefore the solubility is different.

[0077] The overall load loss changes depending on the choice of particle layering. The two curves shown in Figure 3 are inversely related. When arranged in order, two different head losses occur, and therefore two different beverages are produced. Furthermore, the drainage during the extraction cycle differs depending on the wetting mode of the coffee grounds in the filter. ru.

[0078] Figure 5 shows a very schematic representation of the main components of the coffee grinding machine 1 according to an embodiment of the present invention. This is shown. 2 is the electric force that displaces the grinder 3 relative to the rotation of the grinder 3. This shows the motor. 4 shows the inverter that controls the motor speed. 5 is the control unit. This indicates that 6 is an encoder (optional) for detecting speed.

[0079] Figure 5 shows the coffee being ground, which is contained within the portable filter PF. The route to Tabasket FT is roughly shown below.

[0080] According to the embodiment, changes in grinder speed / distance are controlled by an appropriate interface 7 (Figure 6) can be performed by the bartender via Interface 7, for example, a predetermined Rotational speed, predetermined distance between grinders, rotational speed profile and distance between grinders It can be equipped with a push button (or multiple push buttons) for selecting a file. The interface allows for multiple rotational speeds (or distance between grinders) (continuous or stepped). A rotatable knob to select (specifically), or select from a variety of available options / speeds. It can be equipped with a touchscreen. Interface 7 is connected to the inverter 4 (directly The motor's power supply frequency is connected via a direct connection or other device, such as a CPU 5. Change the rotation speed. Advantages include the rotation speed provided by the manufacturer or selected by the user. It is possible to offer an option to select the rotation speed from among the available speeds. Advantageously, a constant speed Rather, the dose (one dose) is administered at two (or more) different speeds or at a continuously changing speed. A memory module that stores the rotational speed values ​​and / or speed profiles for crushing (two or more times). We can provide spears.

[0081] Therefore, the control unit 5 transmits the rotational speed of the motor 2 to the inverter 4. The system does not measure the actual rotational speed of the motor, even in an open-loop system, or a dedicated encoder 6. It can operate in either a closed-loop system that uses a device to detect the motor speed or in a closed-loop system. ru.

Claims

1. A coffee grinding machine (1) grinds coffee beans and forms a quantity (D) of ground coffee in a filter basket (FT) having a bottom layer of ground coffee having a first average particle size and an adjacent layer of ground coffee having a second average particle size, - A grinding component (3) for grinding coffee beans, - An electric motor (2) that rotates at least one crushing member (3) relative to another crushing member (3), - A device (4) configured to change the rotational speed of the electric motor (2) between a first speed and a second speed during a single continuous grinding operation to form a dose (D), - A measuring member for calculating the mass of the aforementioned amount of ground coffee, The apparatus (4) is configured to change the speed from the first speed to the second speed in response to the mass of the first portion of the amount of coffee ground at the first speed reaching a predetermined value. A coffee grinding machine (1) wherein the second average particle size is smaller than the first average particle size and the first speed is greater than the second speed, or the second average particle size is larger than the first average particle size and the first speed is lower than the second speed.

2. The coffee grinding machine (1) according to claim 1, wherein the coffee grinding machine (1) operates in a closed loop and is equipped with an encoder (6) for detecting the rotational speed of the electric motor (2).

3. A coffee grinder (1) according to claim 1 or 2, further comprising an interface for selecting a speed profile for grinding a quantity (D) of coffee.

4. A method for obtaining a quantity (D) of ground coffee in a filter basket (FT) having a bottom layer of ground coffee having a first average particle size and an adjacent layer of ground coffee having a second average particle size, (a) A step of providing a grinding member (3) for grinding coffee beans, (b) Providing an electric motor (2) that rotates one crushing member (3) relative to another crushing member (3), (c) During a single continuous grinding operation, the step of rotating at least one grinding member (3) relative to another grinding member (3) at a first speed, and then at a second speed, The speed is changed from the first speed to the second speed when the mass of the first portion of the amount of coffee ground at the first speed reaches a predetermined value. The bottom layer of ground coffee having the first average particle size corresponds to the first speed, and the adjacent layers of ground coffee having the second average particle size correspond to the second speed. A method in which the second average particle size is smaller than the first average particle size and the first speed is greater than the second speed, or the second average particle size is larger than the first average particle size and the first speed is lower than the second speed.

Images