Coffee Extracting Apparatus and Controlling Method of the Same

Abstract

The present disclosure relates to a coffee extraction device comprising: a capsule mounting portion for mounting a capsule in which coffee beans are stored; a capsule opening portion for opening the capsule and discharging the coffee beans stored in the capsule; an opening gear portion including a first opening gear for rotating the capsule opening portion; a grinding portion coupled to the capsule opening portion in the direction in which the coffee beans are discharged through the capsule opening portion to grind the coffee beans discharged through the capsule opening portion; and a grinding gear portion including a grinding gear connected to a grinding gear shaft that rotates the first opening gear, and a grinding gear portion located below the opening gear portion to rotate the grinding portion by the grinding gear.

Description

Technology Field

[0001] The present disclosure relates to a coffee brewing device. More specifically, it relates to a capsule opening part that opens a capsule storing coffee beans. Background Technology

[0002] Recently, machines that extract espresso by applying pressure or centrifugal force according to a set recipe using ground coffee beans provided in capsules (hereinafter referred to as capsule coffee machines) or machines that extract using the drip method (hereinafter referred to as capsule drip machines) are being widely sold.

[0003] In particular, in the case of capsule coffee machines, the coffee beans are ground and a precise amount of ground coffee powder according to the recipe is placed in the capsule. When the capsule is inserted into the machine, water at a certain temperature is flowed through the capsule, and coffee can be extracted by applying pressure or high-speed rotation. Similarly, capsule drip machines are configured to puncture a capsule containing ground coffee powder, flow water inside, and after a certain period of time, the extracted coffee flows out through a capsule outlet containing a filter.

[0004] However, most conventional coffee capsules are designed so that when inserted into a machine with ground coffee inside, the inlet and outlet are perforated to allow water to flow in and out, wetting the coffee grounds within the capsule as they pass through. Consequently, after the coffee is extracted, the capsule remains inside along with the grounds, making separate disposal difficult. Furthermore, the capsule packaging itself is made of a composite coating of various materials, posing a problem that makes separate recycling challenging.

[0005] Meanwhile, U.S. registered patent US10537202B2 discloses a pod in which coffee beans are stored, and a method for grinding coffee beans by opening the pod by perforation, peeling, or cutting, and then sending the beans to a grinder through a hopper. However, there is a problem in that the distance between the pod and the grinder is long, which can contaminate the beans in the hopper, and the opening of the pod and the rotation of the grinder are driven by different drive units, thereby increasing the volume of the device. The problem to be solved

[0006] The present disclosure addresses the problem of maintaining freshness for a long time by packaging whole beans in a capsule, rather than using a capsule containing coffee powder, after grinding the beans.

[0007] The present disclosure aims to solve the problem of providing a capsule that is easy to separate and recycle because no coffee grounds remain inside the capsule after opening.

[0008] The present disclosure aims to solve the problem of simplifying and compacting a coffee extraction device by operating a capsule opening device and a grinder (or grinding unit) for grinding coffee beans using the same driving source.

[0009] The present disclosure has a problem to solve by providing a coffee extraction device including a capsule opening part for making it easier to open a capsule having a film-shaped cover. means of solving the problem

[0010] To solve the above-mentioned problem, the present disclosure provides a coffee extraction device comprising a capsule punch and a punch lifter for opening a capsule in which coffee beans are stored. The capsule punch includes a blade, and the blade penetrates a film membrane that seals the opening of the capsule body and rotates to cause the film membrane to flap or fluttering, thereby guiding the coffee beans stored inside the capsule to be discharged to the outside.

[0011] To solve the aforementioned problem, specifically, a coffee extraction device is provided comprising: a capsule mounting part in which a capsule containing coffee beans is mounted; a capsule opening part for opening the capsule and discharging the coffee beans stored in the capsule; an opening gear part including a first opening gear for rotating the capsule opening part; a grinding part coupled to the capsule opening part in the direction in which the coffee beans are discharged through the capsule opening part, for grinding the coffee beans discharged through the capsule opening part; and a grinding gear part including a grinding main gear connected to a grinding main gear shaft that rotates the first opening gear, and located below the opening gear part to rotate the grinding part by the grinding main gear.

[0012] The above capsule opening unit may include a driver unit for opening the capsule; and a driver rotation unit that moves and rotates the driver unit in the direction where the capsule is located through rotation to open the capsule and send it to the crushing unit.

[0013] The driver unit may include: a driver hub providing a center of rotation; a first blade unit comprising a plurality of first blades for opening the capsule, wherein one end of each of the plurality of first blades is connected to the driver hub; a ring-shaped driver body surrounding the driver hub; and a second blade unit located below the first blade unit, comprising a plurality of second blades that open the capsule together with the first blade unit to guide the coffee beans stored in the capsule to be discharged toward the grinding unit, and which connects the driver hub and the driver body.

[0014] Each of the above plurality of first blades is provided to be inclined in a first direction, and each of the above plurality of second blades can be inclined in a second direction opposite to the first direction.

[0015] Each of the above-mentioned plurality of first blades may be provided with a curved shape that becomes more inclined in the first direction as it moves further away from the driver hub.

[0016] In addition, the vertical height of each of the above plurality of first blades can gradually increase as they move further away from the driver hub.

[0017] When the above capsule is mounted on the capsule mounting portion, the upper portion adjacent to the free end of each of the plurality of first blades can penetrate a part of one surface of the corresponding capsule and be inserted into the interior of the capsule.

[0018] Meanwhile, the driver unit further includes a plurality of body protrusions formed on the outer surface of the driver body, and the driver rotation unit rotates by receiving the rotational force of the opening gear unit and forms a driver installation space in which the driver unit is located, and comprises a cylindrical rotation body with both ends open; a capsule mounting unit coupling member located at one end of the rotation body and coupled with the capsule mounting unit; a coffee bean outlet located at the other end of the rotation body through which coffee beans discharged from the mounted capsule are discharged toward the grinding unit; and a driver movement guide unit located between the driver unit and the rotation body in the driver installation space and rotates together with the rotation body to move and rotate the driver unit; wherein the driver movement guide unit comprises a ring-shaped movable ring body forming the outer shape of the driver movement guide unit; and a movable screw projection located on the inner surface of the movable ring body and coupled with the body protrusions. and at one end of the moving screw projection located in the direction where the capsule mounting portion is located among the two ends of the moving screw projection, a moving stopper may be included to prevent the driver portion from rising higher than a preset opening height.

[0019] The above-mentioned moving stopper may be in the form of a projection bent toward the capsule mounting portion along the axial direction of the moving ring body at one end of the moving screw projection.

[0020] Additionally, the driver movement guide part further includes a plurality of fixed protrusions provided on the outer surface of the movement ring body, and the rotating body further includes a plurality of inner fixed guides on the inner surface of the rotating body corresponding to the plurality of fixed protrusions, so that the plurality of fixed protrusions and the plurality of inner fixed guides are coupled, allowing the rotating body and the driver movement guide part to rotate simultaneously.

[0021] The above-described rotating body includes a rotating ring gear in the shape of gear teeth on the outer surface of the above-described rotating body, and the rotating ring gear meshes with the above-described opening gear part to transmit the rotational force of the above-described opening gear part to the driver rotating part.

[0022] Meanwhile, the capsule mounting portion may include a circular mounting body forming the outer shape of the capsule mounting portion; a mounting recess formed by recessing a part of the mounting body to form a shape corresponding to the outer shape of the capsule; and a coffee bean drop hole formed by penetrating a part of the mounting recess along the axial direction of the capsule opening portion.

[0023] The above capsule mounting portion may further include a capsule protective cover rotatably coupled to the mounting body to protect the capsule or the mounting recess.

[0024] The capsule mounting portion comprises: a circular mounting body that forms the outer shape of the capsule mounting portion and is coupled to the capsule mounting portion coupling member; a mounting recess formed by recessing a part of the mounting body to form a shape corresponding to the outer shape of the capsule; and a coffee bean drop hole formed by penetrating a part of the mounting recess along the axial direction of the capsule opening portion; wherein the outer diameter of the mounting body may be larger than the diameter of the rotating body.

[0025] The diameter of the above bean drop hole may be larger than the outer diameter of the above first blade part.

[0026] Additionally, it further includes a protective frame supporting the capsule opening portion; and a side protective body protecting the side of the capsule opening portion connecting the mounting body and the protective frame; wherein the side protective body may be provided with a transparent material.

[0027] Meanwhile, the capsule opening unit comprises: a driver unit that opens the capsule through rotation; and a driver rotation unit that moves the driver unit in the direction where the capsule is located and rotates it to open the capsule and send it to the grinding unit; wherein the grinding unit comprises: a first burr that grinds the coffee beans discharged through the capsule opening unit; a first burr penetration hole that penetrates the first burr in the axial direction; a first burr inlet located at one end of the first burr penetration hole for introducing the coffee beans; a first burr outlet located at the other end of the first burr penetration hole for discharging the ground coffee beans as coffee powder; a second burr inserted into the interior of the first burr penetration hole through the first burr outlet to form a grinding space for grinding the coffee beans together with the first burr; a grinding rotation unit coupled to the outer surface of the first burr to rotate the first burr; and a grinding power unit that generates rotational force for the rotation of the grinding rotation unit. It further includes, the grinding main gear shaft is connected to the grinding power unit and rotates by the grinding power unit, and the first opening gear is coupled with the grinding main gear shaft at the upper part of the grinding main gear to transmit the rotational force of the grinding power unit to the driver rotation unit.

[0028] The above driver rotation part includes a cylindrical rotating body with both ends open, which receives rotational force from the opening gear part and forms a driver installation space in which the driver part is located; and a rotating ring gear in the shape of gear teeth on the outer surface of the rotating body; and the opening gear part may further include a second opening gear that connects the first opening gear and the rotating ring gear to rotate the rotating body.

[0029] Meanwhile, a control method for a coffee extraction device comprising: a capsule mounting part in which a capsule containing coffee beans is mounted; a capsule opening part for opening the capsule and discharging the coffee beans stored in the capsule; a first opening gear located on the side of the capsule opening part and rotating the capsule opening part; a first burr located in the direction in which coffee beans are discharged through the capsule opening part and rotating to grind the coffee beans discharged through the capsule opening part, a first burr penetration hole penetrating along the axial direction of the first burr, and a second burr inserted inside the first burr penetration hole to form a grinding space for grinding the coffee beans together with the first burr; and a grinding rotation part coupled to the outer surface of the first burr to rotate the first burr; wherein, after detecting a user's start input, a first rotation step of rotating the grinding rotation part and the capsule opening part connected to the grinding cycle gear shaft in a first rotation direction for a preset grinding time; The present invention provides a control method for a coffee extraction device comprising: a second rotation step of rotating the grinding cycle gear shaft in a second rotation direction opposite to the first rotation direction during a preset return time after the grinding time has elapsed. Effects of the invention

[0030] The present disclosure allows for maintaining freshness for a long time by packaging whole beans in capsules, rather than using capsules containing coffee powder, after grinding the beans.

[0031] The present disclosure has the effect of facilitating separation and recycling because no coffee grounds remain inside the capsule after opening.

[0032] The present disclosure has the effect of simplifying and compacting a coffee extraction device by operating the capsule opening and the grinder (or grinding unit) for grinding coffee beans using the same driving source.

[0033] The present disclosure has the effect of making it easier to open a capsule having a film-type cover. Brief explanation of the drawing

[0034] Figure 1 schematically shows an example of a coffee extraction device. FIG. 2(a) schematically illustrates the grinding principle of the grinding unit included in the coffee extraction device. FIG. 2(b) illustrates an example of the grinding unit included in the coffee extraction device. FIG. 3(a) shows the assembled form of a conical burr included in a grinding section. FIG. 3(b) shows an example of a first burr, which is an outer burr of the conical burr. FIG. 4(c) shows an example of a second burr, which is an inner burr of the conical burr. FIG. 4(a) shows an exploded view of an example of a grinding section included in a coffee extraction device. FIG. 4(b) shows an example of a second grinding section combined with a guide section. FIG. 5(a) illustrates an example in which the grinder assembly is separated from the support assembly. FIG. 5(b) illustrates an example in which the second grinding part is connected to or separated from the first grinding part. FIG. 5(c) shows a cross-section of the guide part and the rotating ring of the grinding control rotating part. FIG. 6(a) shows a protective body portion and a capsule protective cover forming an outer shell for protecting the capsule opening portion. FIG. 6(b) shows a cross-section along the plane marked S in FIG. 6(a). FIG. 6(c) shows a mounting body of the capsule mounting portion. FIGS. 7(a) and FIGS. 7(b) show a circular capsule and a cross-section thereof. FIGS. 7(c) and FIGS. 7(d) show an angular capsule and a cross-section thereof. FIG. 8(a) shows an exploded view of an example of a capsule opening part. FIG. 8(b) shows an example of a driver part. FIG. 8(c) shows a top view of the driver part. FIG. 9(a) illustrates a case where a user mounts a capsule to a capsule mounting part and multiple first blades penetrate the capsule closing part and are inserted into the capsule. FIG. 9(b) illustrates a case where multiple first blades are vertically moved to a maximum extent by a preset opening height and inserted into the capsule. FIG. 9(c) illustrates the height of the first blades at the initial mounting stage of the capsule using the height direction cross-section of FIG. 9(a). FIG. 9(d) illustrates the height of multiple first blades when they are inserted to the maximum extent into the capsule using the height direction cross-section of FIG. 9(b). FIG. 10 is a flowchart illustrating an example of a control method for the capsule opening and crushing sections. Specific details for implementing the invention

[0035] Preferred embodiments of the present disclosure are described in detail below with reference to the attached drawings. The configuration of the device or the control method described below are intended only to explain the embodiments of the present disclosure and are not intended to limit the scope of the rights of the present disclosure, and reference numerals used identically throughout the specification indicate identical components.

[0036] Specific terms used in this specification are for convenience of explanation only and are not intended to limit the exemplified embodiments. For example, expressions such as "identical" and "same" indicate not only strictly identical states but also states where tolerances or differences exist to the extent that the same function is obtained.

[0037] In this specification, the term "whole bean" refers to roasted coffee beans, not green coffee beans harvested directly from the coffee tree. Roasted coffee beans may come in various types depending on the degree of roasting. For example, dark-roasted coffee, which is roasted for a long time, allows coffee components to dissolve more easily in water than light-roasted coffee. However, in this specification, the term is used to refer to roasted coffee beans to be used for coffee extraction, regardless of the degree of roasting.

[0038] Additionally, the coffee powder used in this specification refers to coffee powder of a preset size, which may be set differently depending on the preference and type of coffee bean. Therefore, coffee powder of a preset size does not refer to coffee powder having a specific size, but rather to a size that can be set by varying the value according to the preference and type of coffee bean.

[0039] In addition, the first temperature refers to a temperature below room temperature, and the second temperature refers to a temperature higher than the first temperature.

[0040] In addition, the term "coffee extraction device" refers to a device that mixes ground coffee beans, i.e., coffee powder, with water and then dissolves the coffee components in the water to extract coffee liquid. Coffee liquid refers to water containing coffee components extracted from coffee powder using water. Therefore, in this specification, "extracting coffee liquid" means producing water containing coffee components extracted from coffee powder using water.

[0041] Additionally, unless otherwise specified in this specification, "coffee" generally refers to liquid coffee. However, when used as coffee powder, it may refer to coffee in solid form.

[0042] Table 1 below summarizes the types of burrs primarily used in conventional coffee grinders. The burr is a core component of the grinder, consisting of two parts (an outer burr and an inner burr) equipped with blades that face each other to grind the beans. One part is fixed while the other rotates to grind the beans. The principle involves the outer burr and the inner burr maintaining a constant distance to grind the supplied beans using their blades. Except for large-scale grinding factories, cafes and home use mainly utilize flat burrs or conical burrs. Both flat and conical burrs operate by having two blades facing each other for grinding, but they are classified based on their shape. Additionally, flat burrs can be divided into vertical and horizontal types depending on the direction of the burr's axis of rotation.

[0043] In the case of a flat burr, the inner burr (a1, b1) rotates by an external drive unit, while the outer burr (a2, b2) is fixed. In the case of a vertical burr, the ground coffee beans (or coffee powder) are not entirely discharged through the grinding discharge unit but are scattered and unintentionally accumulate on the upper and lower sides of the housing (a3, b3). Since there are many areas contaminated by the coffee powder, and the accumulated coffee powder is unhygienic and poses a risk of mixing with newly ground beans during discharge, it can degrade the taste. In the case of a horizontal burr, not only do ground coffee beans accumulate in the same way, but since the drive unit or drive connection for driving the vertical axis is located at the bottom, contamination of the drive unit or drive connection cannot be avoided. In other words, for both horizontal and vertical burrs, the entire interior of the housing (a3, b3) can be contaminated due to centrifugal force during grinding.

[0044] In contrast, conical burrs, which are widely used for household purposes, can reduce contaminated areas through vertical descent in the direction of gravity. However, in the case of conventional conical burrs, the inner burr (c2, center burr) rotates while the outer burr (c1, outer burr) is fixed, so the drive unit for rotating the inner burr is located at the bottom of the inner burr. Consequently, there is a very high possibility that the drive unit will be contaminated by falling coffee grounds.

[0045] To solve this problem, the present disclosure describes a coffee brewing device comprising a grinder characterized by the outer burr of the conical burr rotating to minimize the grinding path and the contamination area.

[0046] [Table 1]

[0047]

[0048] As illustrated in FIG. 1, a coffee extraction device (1000) of one embodiment of the present disclosure comprises a grinding unit (200) for grinding coffee beans into coffee powder of a size smaller than a preset size, a filter unit (not shown) located below the grinding unit (200) for receiving the coffee powder and rotating it together with water to extract coffee liquid, an extraction unit (600) including a receiving unit (610) into which the filter unit (not shown) is inserted and which stores the coffee liquid extracted through the filter unit or supplied water, a driving unit (not shown) coupled with the filter unit (not shown) to rotate the filter unit (not shown), a support unit (910) for supporting the grinding unit (200) and the extraction unit (600) from the outside, and a water supply unit (400) for supplying water to the extraction unit (600).

[0049] Coffee beans or coffee powder ground through the grinding unit (200) can be received in the extraction unit (600) through the extraction unit inlet (615) which is opened (615) in the direction of the grinding unit (200), and then water can be supplied through the water supply unit (400) to mix the coffee powder and water and extract the coffee liquid.

[0050] In addition to this, the above coffee extraction device (1000) may further include a bean supply unit (100) that supplies beans to the grinding unit, and a base (920) that supports the support unit (910) and includes a control unit (not shown).

[0051] The above-mentioned bean supply unit (100) may be supplied by a user manually adjusting the amount of beans, but it may also be provided in the form of a dispenser that stores an amount of beans that can be used multiple times and supplies beans to the grinding unit whenever necessary. Alternatively, it may be provided in the form of a disposable bean storage capsule (not shown) that stores only enough beans for one serving. When the above-mentioned bean storage capsule is connected to the above-mentioned bean supply unit (100), the above-mentioned bean storage capsule can be automatically opened and discharged to the grinding unit (200).

[0052] That is, the above-mentioned coffee bean supply unit (100) may be provided in the form of a capsule opening unit (110) for taking out coffee beans stored in a capsule. The capsule opening unit (110) may have various embodiments depending on the form in which the capsule is sealed. If it is sealed in the form of a film, it may be provided with a blade for tearing the film, and if it is sealed in the form of a plastic lid, it may be a form in which the plastic lid is turned to open it.

[0053] At this time, the above-mentioned coffee bean storage capsule may be equipped with an identification device (not shown) containing the type of coffee beans, etc. The identification device contains the type of coffee beans, the degree of roasting, and the date of roasting, etc., and after recognizing this, the degree of grinding (or grinding degree) in the grinding unit (200) and the extraction time in the extraction unit (600) can be adjusted.

[0054] In one embodiment of the present disclosure, coffee beans fall from the coffee bean supply unit (100), and the fallen coffee beans are ground in the grinding unit (200) into coffee powder of a size smaller than or equal to a preset size, and can be received in a filter unit (not shown) provided inside the extraction unit (600).

[0055] The grinding unit (200) grinds the supplied coffee beans into coffee powder of a size smaller than or equal to a preset size. Since the grinding degree and the degree of extraction may differ depending on the type of coffee, the grinding degree can be set differently according to the user's choice or the type of coffee. This is because the taste of the coffee liquid may vary depending on the grinding degree, the degree of roasting, and the temperature of the water.

[0056] Since the degree of grinding refers to the surface area available for contact with water, finer ground beans have a larger surface area, which can make it easier to extract compounds within the coffee.

[0057] In addition, the grinding unit (200) must also mitigate the impact when the coffee beans are ground and be easy to clean for home use. To this end, the grinding unit may use a conical burr (see FIG. 3(a)), and by rotating the outer burr among the center burr and the outer burr of the conical burr, the driving unit may be avoided from being located within the falling area of ​​the coffee grounds.

[0058] The extraction unit (600) may include a filter unit (not shown) that receives coffee grounds falling from the grinding unit (200) and a receiving unit (610) into which the filter unit (not shown) is inserted. The filter unit (not shown) can rotate the coffee grounds and the supplied water to extract the coffee liquid. The temperature of the water may rise through the rotation of the filter unit (not shown). This is because the random movement of water molecules increases due to the rotation of the filter unit (not shown). However, the rise in the temperature of the water is very minimal, so it is safe to assume that the first temperature remains unchanged.

[0059] The receiving portion (610) can store coffee liquid extracted through the filter portion (not shown) or water at the first temperature. The filter portion (not shown) is made of a mesh material so that water or coffee liquid can pass through freely, whereas solid coffee grounds cannot pass through. Therefore, when the filter portion (not shown) rotates, the coffee grounds, water, and coffee liquid will rotate inside the filter portion (not shown), and the water and coffee liquid will rotate between the outside of the filter portion (not shown) and the receiving portion (610).

[0060] The lower part of the extraction unit (600) may include a coffee server (800) capable of storing the extracted coffee liquid. The coffee server (800) may be a kettle-shaped pot or may have a commonly used cup shape. Additionally, the coffee liquid may be stored by dropping it directly from the lower part of the first extraction unit (6001), or the coffee liquid may be moved to another location and stored using a discharge unit (not shown) that guides the coffee liquid to the outside.

[0061] The above extraction unit (600) can be divided into a cold brew method and a hot brew method depending on the temperature of the water used during extraction. If water at a first temperature, which is below room temperature, is used, it is considered a cold brew method, and if water at a second temperature higher than the first temperature is used, it is considered a hot brew method. The above extraction unit (600) may include a first extraction unit (6001) using water at the first temperature and a second extraction unit (6002) using water at the second temperature, and the user can attach and detach it to the support unit (910) according to the desired extraction method.

[0062] The first extraction unit (6001) above uses water at the first temperature, so it is used when using the cold brew method. On the other hand, when using water at a second temperature higher than the first temperature, a second extraction unit (6002) having a different structure may be used. In this case, the first extraction unit (6001) and the second extraction unit (6002) have a structure that is coupled to the support unit (910) and occupy a similar space between the grinding unit (200) and the coffee server (800) in the coffee extraction device (1000), so they are interchangeable. Therefore, the user can select the first extraction unit (6001) or the second extraction unit (700) according to the desired extraction method. Also, water at the first temperature or water at the second temperature can be supplied through the water supply unit (400).

[0063] The above water supply unit (400) can supply water of a first temperature or water of a second temperature to the above first extraction unit (6001) or the above second extraction unit (6002), respectively, using a water supply nozzle (410). The above water supply unit (400) can receive water of the first temperature or water of the second temperature from an external water source. Alternatively, the above water supply unit (400) can receive water of the first temperature through an external water source, heat the water using a heater (not shown), and then supply it to the above second extraction unit (6002).

[0064] The extraction unit including the aforementioned filter unit (not shown) relates to the first extraction unit (6001), and the second extraction unit (600) may use a general method of extracting by dripping water of a second temperature using a paper filter in the receiving unit (610) instead of the filter unit.

[0065] Water may be supplied through a water supply pipe connected to the water supply tank after storing water in the tank in advance using a water supply tank (not shown) instead of an external water source.

[0066] The extraction unit (600) can be fixed to a support unit (910) provided on the side by a support arm (690). The base (920) can be connected to the support unit (910) at an angle or vertically. The base fixes the support unit (910) and supports the load applied to the support unit (910). That is, the bean supply unit (100), grinding unit (200), water supply unit (400), and first extraction unit (6001), etc., are directly or indirectly connected to the support unit (910), thereby causing an eccentric load. As a result, bending moment, shear force, torsion, etc., may be applied to the support unit (910). The base (920) can perform the role of fixing and supporting the support unit (910) to withstand this.

[0067] Additionally, the interior of the base (920) may include a control unit (not shown) for controlling the coffee extraction device (1000). The control unit (not shown) controls each motor that can be used in the grinding unit (200), the bean supply unit (100), the first extraction unit (6001), or the water supply unit (400), and can control the amount of water in the water supply unit, whether the discharge unit (680) is open or closed, the rotation of the grinding unit, and the adjustment of the grinding degree of the grinding unit. However, the control unit (not shown) may be located elsewhere in the coffee extraction device (1000) as well.

[0068] Additionally, a button or display (not shown) for input / output may be located on the base (920).

[0069] The first extraction unit (6001) is located below the grinding unit (200) to receive ground coffee beans, i.e., coffee powder, and mix them with water to extract coffee liquid. In particular, to extract coffee liquid using the cold brew method, the first extraction unit (6001) may use water at a first temperature having a temperature below room temperature. The first extraction unit (6001) may include a receiving unit (610) and a filter unit (not shown).

[0070] A filter unit (not shown) may be provided inside the receiving unit. The filter unit (not shown) may receive coffee grounds that are ground and fall through the grinding unit (200). The coffee grounds are mixed with supplied water and stirred through the rotation of the filter unit (not shown) to extract the coffee liquid. The filter unit (not shown) may allow only water or extracted coffee liquid to pass through and prevent the coffee grounds from passing through. Therefore, the coffee grounds cannot move to the receiving unit (610) by the filter unit (not shown). That is, most of the exterior is made of a mesh-type material to perform filtering.

[0071] The receiving section (610) provides a space for storing extracted coffee liquid or water. Water of a first temperature supplied through the water supply section (400) (hereinafter, water of a first temperature is simply referred to as water unless otherwise specified) can be supplied to the receiving section.

[0072] Figure 2(a) schematically illustrates the grinding principle of the grinding unit included in the coffee brewing device. First, a conical burr is used, which has a simple structure and is suitable for home use. Unlike a flat burr, it has the advantages of generating less heat and relatively less noise during grinding, and better preserving the flavor of the coffee.

[0073] Depending on the type of coffee bean, the size of the coffee grounds required to brew the optimal coffee may vary. Generally, the finer the grind, the larger the surface area in contact with water; however, since this also depends on the degree of roasting of the beans, the optimal grinding degree may vary for each type of bean.

[0074] Many factors determine the taste of coffee, including freshness, water temperature and type, and the extraction method. Among these, grinding is one of the most important elements in the coffee extraction process. Grinding is the process of crushing coffee beans to expand the surface area for extraction. This is because grinding allows various coffee components to dissolve more easily in water during extraction, thereby influencing the coffee's aroma and flavor. Therefore, adjusting the grind size by varying the individual coffee grounds—that is, the size of the coffee particles—through grinding can be referred to as adjusting the grind degree.

[0075] To adjust the grinding degree according to the supplied coffee beans, the second burr (232) can move along the axial direction of the first burr to adjust the depth of insertion into the first burr through hole (2313) described later. The grinding degree adjustment can also be performed automatically rather than manually; when a user inputs the type of coffee beans, a control unit (not shown) can control a drive unit to adjust the grinding degree. Alternatively, the control unit (not shown) can read a barcode attached to a capsule supplied to the coffee bean supply unit or a communication chip using Near Field Communication (NFC) and automatically set the appropriate grinding degree.

[0076] The conical burr includes a first burr (231) located externally and a second burr (232) inserted into the first burr (231) to form a grinding space where coffee beans are ground together with the first burr (231). In the case of a conventional conical burr, the first burr (231) is fixed, and the second burr (232) rotates to grind the coffee beans into coffee powder. This is because rotating the second burr (232) located internally makes it easier to align the rotational centers of the first burr (231) and the second burr (232). However, this is because the structure allows coffee powder to accumulate in the drive unit, as the drive unit that drives the second burr (232) must be connected to the second burr (232). In this case, the accumulated coffee powder can be a cause of contamination and a cause of drive unit failure.

[0077] On the other hand, in a coffee extraction device (1000) which is an embodiment of the present disclosure, a first burr (231) located externally may rotate and a second burr (232) may be fixed. Additionally, it includes configurations for aligning the rotational centers of the first burr (231) and the second burr (232).

[0078] FIG. 2(b) illustrates an example of a grinding unit (200) in a coffee extraction device (1000). The grinding unit (200) may include a grinder assembly (210) responsible for grinding supplied coffee beans, and a driving unit (290) for supporting the grinder assembly (210) and driving the grinder assembly (210).

[0079] The grinder assembly (210) has a first grinding part (211) including a first burr (231, see FIG. 3) and a second grinding part (212) including a second burr (232, see FIG. 3) inserted into the first burr (231, see FIG. 3) which is coupled to the first grinding part (211).

[0080] In the direction in which coffee beans are supplied from the first grinding section (211), the first grinding section inlet (2111) is located to receive the coffee beans and deliver them to the first burr (231) located inside. The first burr (231) and the second burr (232) can grind the supplied coffee beans using a blade and discharge them.

[0081] The first grinding part (211) may include a first housing (241) forming the outer shape of the first grinding part (211) and a second housing (242) coupled to the first housing (241).

[0082] The second grinding section (212) may include a second burr (232, see FIG. 3). The first grinding section (211) and the second grinding section (212) may be joined when the second burr (232) is inserted into the interior of the first burr (231).

[0083] The support assembly (270) may include a grinding drive unit (290) that transmits rotational force to the grinder assembly (210) and a grinding control drive unit (292, see FIG. 4(a)). The grinding drive unit (290) may include a grinding gear unit (2915) and a grinding power unit (2911) that rotates the grinding gear unit (2915), and the grinding control drive unit (290) may include a grinding control gear unit (2925, see FIG. 4(a)) and a grinding control power unit (2921, see FIG. 4(a)) that transmits rotational force to the grinding control gear unit (2925, see FIG. 4(a)).

[0084] Additionally, a planetary gear unit (2913, see FIG. 4(a)) may be further included between the grinding gear unit (2915) and the grinding power unit (2911). The planetary gear unit may be used to reduce the rotational speed of the motor provided in the grinding power unit (2911) and increase the torque.

[0085] The grinding power unit (2911) and the planetary gear unit (2913) may be provided in an installation space (915, see FIG. 1) provided inside the support unit (910). That is, the support unit (910) may not only perform the role of supporting the grinding unit (200), water supply unit (400), extraction unit (600), etc. of the coffee extraction device, but may also be provided in an installation space (915) where a device that generates and transmits power internally is installed. Additionally, FIG. 2 illustrates an example in which the planetary gear unit (2913) and the grinding power unit (2911) are located on one side of the grinding unit (200) in the installation space (915). However, unlike this, the grinding power unit (2911) and the planetary gear unit (2913) can be positioned close to the base (920) and power can be transmitted to the bean supply unit (100) and the grinding unit (200) using a power transmission shaft.

[0086] FIG. 2(b) illustrates an example in which a swing-type idle gear is used in the grinding gear section (2915). An idle gear refers to having an additional dependent gear that connects gears. Here, the grinding gear section (2915, see FIG. 4(a)) includes a grinding main gear (2916, see FIG. 4) and a grinding sub-gear (2917), and the grinding sub-gear (2917) can be connected to a grinding rotation section (250) provided in the first grinding section (211).

[0087] Additionally, it may include a gear connecting arm (2918) that connects and supports the main grinding gear (2916, see FIG. 4(a)) and the secondary grinding gear (2917), and an elastic member (2919) that is connected to the gear connecting arm (2918) and provides elastic force. The elastic member can be inserted into the main grinding gear shaft (2916a), which is the rotation axis of the main grinding gear, and then fixed to the gear fixing part (283) that supports the main grinding gear part (2915) to provide a restoring force to the gear connecting arm (2918).

[0088] In addition, as a characteristic of the swing-type idler gear, the grinding main gear is connected to the grinding main gear shaft (2916a) and can be connected to the grinding power unit (2911) through the planetary gear unit (2913, see FIG. 4(a)). Also, the grinding main gear shaft (2916a) is connected to the planetary gear unit and only rotates, and the grinding main gear shaft (2916a) does not move.

[0089] On the other hand, the grinding secondary gear (2917) connected to the grinding primary gear (2916) can rotate and revolve simultaneously. The grinding secondary gear shaft (2917a), which is supported by the gear connecting arm (2918) and serves to support the rotation of the grinding secondary gear (2917), not only supports the rotation of the grinding secondary gear, but the grinding secondary gear shaft (2917a) itself can also move along the circumferential direction of the grinding primary gear (2916). That is, the grinding secondary gear (2917) can revolve around the grinding primary gear (2916).

[0090] When the main grinding gear (2916) rotates in the first rotational direction, the main grinding gear (2917) and the gear connecting arm (2918) rotate in the second rotational direction and are connected to the grinding rotating part (250, see FIG. 4(a)) so that the grinding rotating part can rotate in the first rotational direction. And when the main grinding gear (2916) does not rotate, due to the restoring force of the elastic member (2919), the gear connecting arm (2918) and the main grinding gear (2917) can rotate again in the first rotational direction and detach from the grinding rotating part.

[0091] That is, the restoring force of the elastic member can be designed to be smaller than the force of rotation of the rotation axis of the grinding secondary gear or the gear connecting arm caused by the rotation of the grinding primary gear (2916). Through this, the force can be transmitted to the grinding secondary gear through the gear connecting arm in the opposite direction only when the grinding primary gear (2916) is not rotating, thereby causing it to detach from the grinding rotation part.

[0092] This ensures that the grinding gear (2917) is always connected to the grinding rotation part when rotating. That is, even if the opposite direction is momentarily transmitted to the grinding gear (2917) due to a repulsive force or vibration caused by the impact of grinding beans in the grinding rotation part, the gear connecting arm (2918) will be able to rotate freely, and the grinding gear (2917) will always be connected to the grinding rotation part (250) by the rotating force of the grinding main gear (2916).

[0093] This can minimize the transmission of shock from the grinding rotation part to the grinding main gear shaft (2916a) or the grinding power part (2911) through the grinding main gear (2916), thereby mitigating the shock transmitted to the grinding gear part (2915), planetary gear part (2913), and grinding power part (2911).

[0094] That is, the above-mentioned grinding gear shaft (2917a) can rotate while maintaining a certain distance around the above-mentioned grinding gear shaft (2916a) by means of the gear connecting arm (2918).

[0095] Generally, when the grinding main gear (2916) rotates in the first rotational direction, the grinding sub-gear (2917), the grinding sub-gear shaft (2917a), and the gear connecting arm (2918) can rotate in the second rotational direction opposite to the first rotational direction.

[0096] The above crushing power unit (2911) may be equipped with a first motor, which is a driving motor. Additionally, the above crushing power unit (2911), the above gear fixing unit (283), a part of the above gear support unit (282), and a part of the above crushing gear unit (2915) may be provided in an installation space (915) provided inside the above support unit (910).

[0097] Accordingly, a part of the gear support part (282), a part of the grinding gear part (2915), the grinder fixing part (281), and the grinder assembly (210) are provided outside the support part (910) so as to be exposed to the user.

[0098] The grinder assembly (210) may be coupled to the coupling space (2811, see FIG. 4(a)) of the support assembly. It may further include a grinder fixing part (281) that forms the coupling space and provides a detachable coupling space for the first grinding part (211), a gear support part (282) that is coupled to the side of the grinder fixing part (281) to protect the planetary gear part (2913, see FIG. 4(a)), and a gear fixing part (283) that is coupled to the upper part of the gear support part (282) to support the grinding gear part (2915).

[0099] Additionally, the grinder fixing part (281), the gear support part (282), and the gear fixing part (283) may be formed integrally. For example, they may be formed from a single piece of plastic by injection molding. They may also be formed by a press molding method using a rapid material, or formed into a single grinder case (280) by methods such as welding or riveting.

[0100] In FIG. 2(a) and FIG. 2(b), the direction of gravity is indicated as g. This is because an example is illustrated in which coffee beans supplied through the first grinding section inlet (2111) fall vertically due to gravity, so the first grinding section inlet (2111) does not necessarily have to be positioned along the direction of gravity. However, when coffee powder falls along gravity, a separate device for falling may not be required, and since the direction of gravity falls almost perpendicularly to the floor surface where the coffee extraction device is placed, the movement path of the coffee powder from the grinding section (200) to the extraction section (600) can be straightened. This straightening simplifies and shortens the movement path of the coffee powder, thereby minimizing the accumulation of coffee powder inside the grinding section (200).

[0101] In addition, as the first burr (231) of the outer burr rotates, the grinding rotating part (250, see FIG. 4) that rotates the first burr (231) is not located in the area of ​​movement of the coffee powder, thereby minimizing contamination of the grinding rotating part.

[0102] FIG. 3(a) illustrates a first burr (231) for grinding the coffee beans, a second burr (232) inserted inside the first burr (231), and a grinding space (238) formed when the first burr (231) and the second burr (232) are combined. The burr is a type of conical burr, and unlike a conventional conical burr, the first burr (231) located on the outside rotates. On the other hand, the second burr (232), after being inserted into and combined with the first burr, can only move along the axial direction of the first burr to adjust the grinding degree and does not rotate. Adjusting the grinding degree refers to adjusting the size of the grinding space to control the size of the coffee powder being ground to a preset value. The size of the grinding space is such that the second burr (232) is provided in a conical shape. Accordingly, when the second burr (232) is inserted into the first burr (231) and moves along the first burr through hole (2313), the distance between the first burr (231) and the second burr (232) changes, so the size of the crushing space can be adjusted.

[0103] Generally, the first burr (231) may include a sharp blade for grinding beans provided on the inner circumference of the first burr through hole (2313). Therefore, it is referred to as an outer serrated burr. Alternatively, the first burr (231) is provided in a conical shape and is referred to as a cone-shaped center burr.

[0104] Referring to FIG. 3(b), the first bur (231) may include a first bur through hole (2313) that penetrates with respect to the axial direction for rotation of the first bur (231), a first bur inlet (2318) located at one end of the first bur through hole for introducing the coffee beans, and a first bur outlet (2319) located at the other end of the first bur through hole for grinding the coffee beans and discharging them as coffee powder.

[0105] Coffee beans introduced through the first grinding section inlet (2111) can be supplied through the first burr inlet (2318), ground in the grinding space, and then discharged through the first burr outlet (2319). Among the outer surfaces of the first burr, the outer surface of the first burr is provided with curves and straight lines, but the cross-section of the outer surface of the first burr that is closer to the first burr outlet (2319) has a circular shape. The first burr (231) can be coupled with the grinding rotation section (250, see FIG. 4(a)) at the first burr inlet (2318) for rotation. When coupled with the grinding rotation section (250, see FIG. 4(a)), the cross-section may have a shape mixed with curves and straight lines to prevent slipping between the grinding rotation section (250, see FIG. 4(a)) and the first burr.

[0106] On the other hand, the outer surface of the first bur outlet (2319) can be inserted into and rotated by the grinding control rotating part (260, see FIG. 4(a)), so it has a circular cross-section. Therefore, it can be referred to as the outer surface of the first bur (2317).

[0107] The inner surface of the first burr through hole (2313) may include a first burr inclined portion (2314) and a first burr blade (2316). The first burr inlet (2318) side may be provided with a first burr inclined portion (2314) that includes a plurality of guide protrusions (2315) for guiding coffee beans, and may be provided in a shape that becomes inclined toward the first burr outlet (2319). Additionally, the plurality of guide protrusions (2315) may be tapered in such a way that the size of the first burr through hole (2313) decreases as it approaches the first burr blade (2316). This is intended to reduce the gap between the first burr (231) and the second burr (232) so that gradually only one coffee bean passes through the grinding space and is ground.

[0108] A first burr blade (2316) for grinding coffee beans into coffee powder may be provided at the first burr outlet (2319) above.

[0109] Referring to FIG. 3(c), a second burr (232) is shown that is inserted into the interior of the first burr through hole (2313) through the first burr outlet and forms a grinding space for grinding beans together with the first burr. The second burr (232) may include a second burr through hole (2323) that penetrates the first burr in the axial direction, a second burr inclined portion (2324) corresponding to the first burr inclined portion (2314) on the outer surface of the second burr (232), a plurality of impellers (2325) corresponding to the plurality of guide protrusions (2315), and a second burr blade (2326) corresponding to the first burr blade (2316).

[0110] Among the multiple coffee beans supplied simultaneously, only one coffee bean enters the space formed by the guide projection (2315) adjacent to one guide projection (2315) and the impeller (2325) adjacent to one impeller (2325), and is ground by the first burr blade (2316) and the second burr blade (2326) to become coffee powder. The size of the grinding space formed between the first burr (231) and the second burr (232) can be varied by the second burr (232) moving along the axial direction of the first burr (231). That is, the degree of grinding can be adjusted. Afterwards, since the distance between the first burr (231) and the second burr (232) is fixed, that is, since the size of the grinding space is fixed, the size of the supplied and ground coffee beans will be discharged as coffee powder smaller than the size expected according to the grinding degree.

[0111] FIG. 4(a) shows an example of grinding a grinding unit (200). The grinding unit (200) may largely include a grinder assembly (210) and a support assembly (270) that supports the grinder assembly (210) and transmits power. The grinder assembly (210) may include a first grinding unit (211) and a second grinding unit (212) coupled to the first grinding unit (211).

[0112] The first grinding unit (211) may include a rotating first burr (231), a first burr penetration hole (2313, see FIG. 3) that penetrates the first burr (231) in the axial direction, a first burr inlet (2318, see FIG. 3) located at one end of the first burr penetration hole (2313) for introducing the coffee beans, and a first burr outlet (2319, see FIG. 3) located at the other end of the first burr penetration hole (2313) for grinding the coffee beans and discharging them as coffee powder.

[0113] The second grinding section (212) may include a second burr (232) that is inserted into the interior of the first burr through hole (2313) through the first burr outlet (2319) to form a grinding space (238) for grinding beans together with the first burr (231), and a burr coupling section (2122) that supports the second burr and connects the second burr to the first grinding section (211).

[0114] The burr coupling part (2122) is coupled in the axial direction of the first burr (231) to support the second burr (232) and to allow the second burr (232) to be coupled to the first grinding part (211). The outer surface of the burr coupling part (2122) includes a burr coupling part screw thread (2122a), so that it can be coupled to the grinding control rotating part (260), which will be described later, through the burr coupling part screw thread (2122a).

[0115] The second grinding unit (212) may further include a handle (2125) to make it easier for the user to grip the burr coupling unit (2122). The outer surface of the handle (2125) is treated with protrusions to prevent slipping when the user grips it, and to allow the user to transmit appropriate rotational force to the second grinding unit (212). Ultimately, the second burr (232) and the burr coupling unit (2122) can be rotated through the handle (2125) to screw-couple the grinding control rotation unit (260).

[0116] The first grinding unit (211) may further include a grinding rotation unit (250) that is coupled to the outer surface of the first burr and rotates the first burr. The grinding rotation unit (250) may be coupled to the outer surface (2312, see FIG. 3) of the first burr located at the first burr inlet (2318). The grinding rotation unit (250) may include a grinding rotation unit through hole (2501) that penetrates along the axial direction of the first burr. The grinding rotation unit through hole (2501) may be in communication with the first burr inlet (2318).

[0117] In order for the grinding rotating part (250) to rotate, the outer surface of the grinding rotating part (250a), which is the outer surface of the grinding rotating part (250), is formed into a gear tooth shape, and through this, it can be connected to the grinding gear part (2915) to be described later. A gear such as the grinding rotating part may be called a ring gear. It means a ring shape having a through hole in the axial direction, and the outer surface of the ring is in the shape of a gear.

[0118] To rotate the first burr (231), the grinding rotating part (250) may have a diameter as large as possible to have a large moment of rotational inertia, and may use a heavy material if necessary. This reduces vibrations caused by impact during coffee bean grinding, thereby achieving the effect of making the ground coffee powder uniform in size.

[0119] Since the first burr (231) rotates through the grinding rotating part (250) coupled to the outer surface of the first burr (231), the second burr (232) is inserted into the first burr (231) without any driving device and can only move slightly along the axial direction of the first burr (231) to adjust the size of the grinding space for grinding degree adjustment. Through this, there is no risk of coffee grounds accumulating on the driving device of the second burr (232) when discharged, thus providing effects such as easy cleaning and prevention of contamination.

[0120] The grinding rotating part (250) can be combined with the first burr (231) and accommodated in the first housing. That is, the first grinding part (211) may include a first housing (241) that accommodates the grinding rotating part (250). The first housing (241) may further include a housing body (2412) that forms a space for accommodating the grinding rotating part (250), a first opening (2411a) provided in the housing body (2412) and open toward the extraction part (600), and a second opening (2411b) provided in the housing body (2412) and in the opposite direction of the first opening (2411a).

[0121] Ultimately, the housing body (2412) has only sides, and one side adjacent to the extraction section (600) and the other side located opposite to said side can both be provided as openings. The first bur (231) and the grinding rotating section (250) can be received and coupled to the housing body (2412) in the direction of the second opening (2411b). In this case, the supplied coffee beans will pass through the grinding rotating section through hole (2501), the first bur inlet (2318), and the first bur outlet (2319) and be discharged through the first opening (2411a).

[0122] A second housing (242) that is coupled to the second opening (2411b) may be coupled to the second opening (2411b). The second housing (242) is coupled so that the grinding rotating part (250) can rotate, thereby preventing the center of rotation of the grinding rotating part (250) from shaking. That is, the first burr (231) does not have an axis at the center of rotation, and since the grinding rotating part (250) coupled to the outer surface of the first burr (231) rotates, it may be more difficult to maintain the center of rotation than when using a rotation axis.

[0123] Since the grinding space between the first burr (231) and the second burr (232) must be maintained constant to produce coffee powder with a desired grinding degree, it is very important that the gap between the first burr (231) and the second burr (232) be maintained constant when the first burr (231) rotates. To this end, the first housing (241) and the second housing (242) can be combined to fix the position of the grinding rotation part (250).

[0124] Additionally, the grinding rotating part (250) may further include a first burr fixing part (251) for coupling the first burr (231) and the grinding rotating part (250). The first burr fixing part (251) is provided at the coupling portion between the grinding rotating part (250) and the first burr inlet (2318) to prevent coffee powder from escaping through the gap, and also to allow the rotational force of the grinding rotating part to be transmitted to the first burr without slipping.

[0125] A first bearing (2119a) and a second bearing (2119b, see FIG. 5(b)) may be provided at both ends of the grinding rotating part (250). The first bearing (2119a) enables the grinding rotating part to rotate in the second housing, and the second bearing (2119b) is received in the first housing to enable the grinding rotating part (250) to rotate. The first bearing (2119a) and the second bearing (2119b) naturally include a first bearing through hole (2119c) and a second bearing through hole (not shown) that penetrate along the axial direction of the first burr. Therefore, the coffee powder discharged through the grinding rotation part penetration hole, the first burr inlet (2318), and the first burr outlet (2319) will not be interfered with by the first bearing (2119a) and the second bearing (2119b).

[0126] A second housing (242) coupled to the first housing (241) and rotatably supporting the grinding rotating part (250) may further include a coffee bean inlet hole (2423) into which coffee beans are introduced, and a fixed shaft support part (2421) into which the fixed shaft is inserted and supported in the coffee bean inlet hole (2423). Furthermore, the fixed shaft support part (2421) may be connected and supported by at least one reinforcing rib (2422) connecting the inner surface of the coffee bean inlet hole (2423) and the fixed shaft support part (2421).

[0127] The fixed shaft support (2421) is coupled with a fixed shaft (2128) that penetrates the second burr, so that it can support the second burr (232) so that it does not shake when the first burr (231) rotates.

[0128] Specifically, the fixed shaft support (2421) may include a fixed shaft coupling groove (2421a, see FIG. 5(b)) into which the fixed shaft (2128) is inserted toward the first bur inlet (2318). When the second bur (232) is inserted into the crushing space (238) through the first bur outlet (2319), the fixed shaft (2128) may be inserted into the fixed shaft coupling groove (2421a) by passing through the first bur through hole (2313).

[0129] The fixed shaft (2128) inserted into the fixed shaft coupling groove (2421a) can move along the axial direction of the first burr (231) inside the fixed shaft coupling groove (2421a). Through this, the gap between the first burr (231) and the second burr (232) can be adjusted to control the degree of grinding.

[0130] The first grinding unit (211) may further include a grinding control rotating unit (260) that is received in the housing body (2412) closer to the first opening (2411a) than the grinding rotating unit (250) and connected to the burr coupling unit (2122), and moves the second burr (232) inserted into the first burr (231) along the axial direction of the first burr to adjust the size of the grinding space (238).

[0131] The above grinding control rotating part (260) can convert the force into rotational motion moving along the axial direction of the first burr. For example, any device capable of converting rotational motion into linear motion, such as a rack, pinion, or bevel gear, is acceptable.

[0132] An example of the grinding control rotating part (260) illustrated in FIG. 4(a) may include a rotating ring (261) that rotates in a ring shape, a rotating ring through hole (2613) that penetrates the rotating ring (261) along the axial direction of the first burr (231), and a cylindrical guide part (262) located in the rotating ring through hole (2613) and forming a receiving space (2622) in which the burr coupling part (2122) is coupled.

[0133] The guide portion (262) includes a receiving space thread (not shown) formed on the inner circumference of the guide portion (262) and a burr coupling portion thread (2122a) formed on the outer surface of the burr coupling portion (2122), so that the burr coupling portion (2122) can be screw-coupled to the guide portion (262).

[0134] The grinder assembly (210) may be coupled to the coupling space (2811) of the support assembly (270). The support assembly (270) may further include a grinder fixing part (281) that forms the coupling space (2811) and provides a detachable coupling space for the first grinding part (211), a gear support part (282) that is coupled to the side of the grinder fixing part (281) to protect the planetary gear part (2913, see FIG. 4(a)), and a gear fixing part (283) that is coupled to the upper part of the gear support part (282) to support the grinding gear part (2915).

[0135] Additionally, the grinder fixing part (281), the gear support part (282), and the gear fixing part (283) may be formed integrally. For example, they may be formed from a single piece of plastic by injection molding. They may also be formed by a press molding method using a rapid material, or formed into a single grinder case (280) by methods such as welding or riveting.

[0136] The support assembly (270) may further include a drive unit (290) that transmits driving force to the grinder assembly (210). The drive unit (290) may be installed in the installation space (915, see FIG. 1) of the support member (910, see FIG. 1) so as not to be exposed to the outside.

[0137] The above drive unit (290) may include a grinding drive unit (290) that rotates the grinding rotation unit (250) and a grinding control drive unit (290) that drives the grinding control rotation unit (260). The above grinding drive unit (290) may include a grinding gear unit (2915) connected to the grinding rotation unit (250) to rotate the grinding rotation unit (250), and a grinding power unit (2911) that transmits rotational force to the grinding gear unit. A planetary gear unit (2913) is located between the grinding power unit (2911) and the grinding gear unit (2915) so that the rotational speed of the grinding power unit (2911) can be reduced to an appropriate speed and transmitted to the grinding gear unit (2915).

[0138] The grinding control drive unit (290) may include a grinding control gear unit (2925) connected to the grinding control rotation unit (260) to rotate the grinding control rotation unit (260), and a grinding control power unit (2921) that transmits rotational force to the grinding control gear unit (2925).

[0139] The control unit (not shown) may be provided on the support unit (910, see FIG. 1) or the base (920, see FIG. 1), but this is merely one embodiment, and it may be located anywhere as long as it can control the water supply unit (400), extraction unit (600), and grinding unit (200) of the coffee extraction device. If a bean supply unit (100) that supplies beans in the form of a bean capsule is additionally provided, the control unit (not shown) will also control the bean supply unit (100). The control unit (not shown) independently controls the grinding power unit (2911) and the grinding control power unit (2921) to control the grinding unit (200). That is, the rotation of the grinding gear unit (2915) and the rotation of the grinding control gear unit (2925) are independent of each other.

[0140] The grinding gear unit (2915) can rotate the grinding rotation unit (250), thereby rotating the first burr (231). That is, it serves to transmit the power required to grind the coffee beans. On the other hand, the grinding control gear unit (2925) can rotate the grinding control rotation unit (260) to move the second grinding unit (212) along the axial direction of the first burr (231).

[0141] Accordingly, the second burr (232) is coupled to the grinding control rotating part (260) by the burr coupling part (2122) and inserted into the interior of the first burr (231). Then, through the rotation of the grinding control rotating part (260), the second burr (232) can be finely adjusted along the axial direction of the first burr (231) inside the first burr (231) to adjust the degree of grinding.

[0142] Therefore, since there is a significant difference in the power required for the grinding rotary unit (250) for grinding beans and the grinding control rotary unit (260) for controlling the degree of grinding, the size of the grinding power unit (2911) that transmits power to the grinding rotary unit (250) may be larger than the size of the grinding control power unit (2921). Here, the size of the grinding power unit (2911) means that the torque, power, etc. of the first motor equipped in the grinding power unit (2911) is greater than the torque, power of the second motor equipped in the grinding control power unit (2921).

[0143] As illustrated in FIG. 4(a), the grinding control drive unit (290) may be located on the side of the grinding drive unit (290). The grinding control drive unit (290) may be fixed to a part of the coupling space (2811) to rotate the grinding control rotation unit (260).

[0144] The grinding gear section (2915) includes a grinding main gear (2916) and a grinding sub-gear (2917), and the grinding sub-gear (2917) can be connected to a grinding rotary section (250) provided in the first grinding section (211).

[0145] Additionally, it may include a gear connecting arm (2918) that connects and supports the main grinding gear (2916) and the secondary grinding gear (2917), and an elastic member (2919) that is connected to the gear connecting arm (2918) and provides elastic force. The elastic member (2919) can be inserted into the main grinding gear shaft (2916a), which is the rotation axis of the main grinding gear, and then fixed to the gear fixing part (283) that supports the main grinding gear part (2915) to provide a restoring force to the gear connecting arm (2918).

[0146] Additionally, as a characteristic of the swing-type idler gear, the main grinding gear is connected to the main grinding gear shaft (2916a) and can be connected to the main grinding power unit (2911) through the planetary gear unit (2913). Furthermore, the main grinding gear shaft (2916a) is connected to the planetary gear unit (2913) and only rotates, so the main grinding gear shaft (2916a) does not move.

[0147] On the other hand, the grinding secondary gear (2917) connected to the grinding primary gear (2916) can rotate and revolve simultaneously. The grinding secondary gear shaft (2917a), which is supported by the gear connecting arm (2918) and serves to support the rotation of the grinding secondary gear (2917), not only supports the rotation of the grinding secondary gear, but the grinding secondary gear shaft (2917a) itself can also move along the circumferential direction of the grinding primary gear (2916). That is, the grinding secondary gear (2917) can revolve around the grinding primary gear (2916).

[0148] When the main grinding gear (2916) rotates in the first rotational direction, the main grinding gear (2917) and the gear connecting arm (2918) rotate in the second rotational direction and are connected to the grinding rotating part (250), thereby allowing the grinding rotating part to rotate in the first rotational direction. Then, when the main grinding gear (2916) does not rotate, due to the restoring force of the elastic member (2919, see FIG. 2(b)), the gear connecting arm (2918) and the main grinding gear (2917) rotate again in the first rotational direction and can be separated from the grinding rotating part.

[0149] That is, the restoring force of the elastic member (2919) can be designed to be smaller than the force of rotation of the rotation axis of the grinding secondary gear or the gear connecting arm caused by the rotation of the grinding primary gear (2916). Through this, the force can be transmitted to the grinding secondary gear through the gear connecting arm in the opposite direction only when the grinding primary gear (2916) is not rotating, thereby causing it to detach from the grinding rotation part.

[0150] Preferably, the elastic member (2919) may be a torsion spring coupled to the main grinding gear shaft (2916a) and fixed to the gear fixing part (283). However, alternatively, when the main grinding gear (2916) rotates, the main grinding gear (2917) is connected to the main grinding part, and when the main grinding gear (2916) stops, the main grinding gear (2917) can be separated from the main grinding part (250), and any other type may be provided. For example, the same function may be performed using an actuator instead of an elastic member.

[0151] This ensures that the grinding gear (2917) is always connected to the grinding rotation part when rotating. That is, even if the opposite direction is momentarily transmitted to the grinding gear (2917) due to a repulsive force or vibration caused by the impact of grinding beans in the grinding rotation part, the gear connecting arm (2918) will be able to rotate freely, and the grinding gear (2917) will always be connected to the grinding rotation part (250) by the rotating force of the grinding main gear (2916).

[0152] This can minimize the transmission of shock from the grinding rotation unit (250) to the grinding main gear shaft (2916a) or the grinding power unit (2911) through the grinding main gear (2916), thereby mitigating the shock transmitted to the grinding gear unit (2915), planetary gear unit (2913), and grinding power unit (2911).

[0153] That is, the above-mentioned grinding gear shaft (2917a) can rotate while maintaining a certain distance around the above-mentioned grinding gear shaft (2916a) by means of the gear connecting arm (2918).

[0154] Generally, when the grinding main gear (2916) rotates in the first rotational direction, the grinding sub-gear (2917), the grinding sub-gear shaft (2917a), and the gear connecting arm (2918) can rotate in the second rotational direction opposite to the first rotational direction.

[0155] The first grinding unit (211) may further include a first housing (241) that accommodates the grinding rotating unit (250) and supports the grinding rotating unit. As described above, the first housing (241) may include a housing body (2412) forming a space for accommodating the grinding rotating part (250), a first opening (2411a) provided in the housing body (2412) with one end open and located in a direction close to the extraction part (600), a second opening provided in the housing body (2412) with the other end open and located in a direction away from the extraction part (600), a first communication hole (2413a) penetrating the housing body (2412) in the radial direction of the grinding rotating part (250), and a second communication hole (2413b) penetrating the housing body (2412) in the radial direction of the grinding control rotating part (260).

[0156] The grinding rotation unit (250) can rotate by connecting the grinding rotation unit (250) and the grinding gear unit (2915) through the first communication hole (2413a). Similarly, the grinding control rotation unit (260) can be connected to the grinding control rotation unit (260) and the grinding control gear unit (2925) through the second communication hole (2413b).

[0157] Accordingly, as shown in FIG. 4(a), the height of the first communication hole (2413a) is different from the height of the second communication hole (2413b). This is because the heights of the grinding rotating part (250) and the grinding control rotating part (260) are different from each other. Additionally, since the grinding control driving part (292) is offset to one side of the coupling space (2811, see FIG. 5(a)), the radial direction of the grinding rotating part (250) in which the first communication hole (2413a) is formed may be different from the radial direction of the grinding control rotating part (260) in which the second communication hole (2413b) is formed. That is, even if the first communication hole (2413a) and the second communication hole (2413b) are assumed to be on the same plane, the straight line formed by the first communication hole (2413a) and the straight line formed by the second communication hole (2413b) can form a certain angle with the first hole as the center.

[0158] Therefore, since the installation positions of the grinding rotation unit (250) and the grinding control rotation unit (260) are different, and the installation positions of the grinding gear unit (2915) and the grinding control gear unit (2925) are different, the positions of the first communication hole (2413a) and the second communication hole (2413b) formed in the housing body (2412) will be different from each other. The sizes of the first communication hole (2413a) and the second communication hole (2413b) will also be different. In addition, the direction in which the outside is viewed from the housing body through the first communication hole (2413a) and the second communication hole (2413b) will also be different from each other.

[0159] FIG. 4(b) illustrates an example in which a second grinding section (212) and a guide section (262) are combined. The guide section (262) may include a first through hole (2601) and a second through hole (2602) that penetrate to be connected to the second grinding section (212), and the first through hole (2601) is a through hole located close to the first burr (231), and the second through hole (2602) is located in the opposite direction of the first through hole (2601), and a part of the second grinding section (212) is inserted through the second through hole (2602) and can pass through the first through hole (2601) and be inserted into the first burr (231).

[0160] The inner surface of the guide part (262) forming the receiving space (2622) may be provided with a receiving space thread (2622a) having a screw thread shape to connect the bur coupling part (2122) to the receiving space (2622). The outer surface of the bur coupling part may also include a bur coupling part thread (2122a) in a screw thread shape, so that the bur coupling part thread (2122a) and the receiving space thread (2622a) can be screw-coupled. Of course, for the user not to use or for cleaning, the screw connection between the bur coupling part thread (2122a) and the receiving space thread (2622a) can be loosened to separate them.

[0161] Therefore, the first grinding section (211) and the second grinding section (212) can be separated, and specifically, the first burr (231) and the second burr (232) can be separated. In other words, the first grinding section (211) and the burr coupling section (2122) can be separated. Accordingly, the first grinding section (211) and the second burr (232) can be coupled when in use and separated when not in use or for cleaning. That is, the first grinding section and the second burr (232) can be selectively separated.

[0162] The guide portion (262) may include a plurality of guide portion protrusions (2621) extending from one end that includes the first through hole (2601). The plurality of guide portion protrusions (2621) may be provided at equal intervals on an arc that includes the first through hole (2601). The guide portion protrusions (2621) may be provided as a single guide portion protrusion formed integrally. The plurality of guide portion protrusions (2621) may connect the guide portion (262) to the rotating ring (261) through the rotating ring screw thread (2612a) provided on the inner surface of the rotating ring (2612).

[0163] The guide portion projection (2621) may be provided with a projection stopper (2621a) to reinforce the strength of the guide portion projection (2621) and to prevent rotation of the guide portion. The projection stopper (2621a) has a shape similar to a rib extending from the guide portion projection (2621) toward the extraction portion (600). When the grinding control rotating portion (260) rotates due to the projection stopper (2621a), the rotating ring (261) may rotate. However, the guide portion (262), which is screw-coupled to the inner circumference of the rotating ring, may move along the axial direction of the first burr in place accordingly.

[0164] The second bur (232) may include a second bur penetration hole (2323) that penetrates the second bur (232), and a fixed shaft (2128) may penetrate the second bur penetration hole (2323) to be joined.

[0165] A burr coupling part (2122) that supports the second burr (232) and connects the second burr (232) to the first grinding part may also be partially accommodated in the receiving space (2622) together with the second burr (232).

[0166] The second burr (232) may include an installation hole (2122c) that penetrates along the axial direction of the first burr. The second burr (232) is installed inside the second burr installation hole (2122c), and the second burr (232) may further include a burr coupling support rib (2122b) connected to the inner circumference of the second burr installation hole (2122c) to support the second burr (232). The reason for having such a penetrating installation hole is that coffee grounds discharged through the first burr outlet fall into the receiving space of the guide part, and eventually, some of the coffee grounds can be discharged to the extraction part (600) through the installation hole (2122c). Accordingly, the handle (2125) may also have a ring shape.

[0167] Ultimately, the movement path of the discharged coffee grounds consists only of through holes and some ribs, so the accumulation of the coffee grounds in areas other than the extraction section can be minimized.

[0168] The present disclosure relates to a coffee extraction device (1000) in which the path through which ground coffee beans pass through a grinding section (200) is simplified and minimized. The grinding section (200) uses a conical burr, and it can be seen that the driving unit is not positioned in the discharge area of ​​the coffee grounds, as the outer burr (first burr) rotates rather than the inner burr. Thus, if gravity acts on the coffee extraction device (1000), there is no driving unit in the path through which the coffee grounds are discharged, and only multiple through holes exist, allowing the coffee grounds to be discharged directly to the extraction section (600) without interference. Therefore, the accumulation of coffee grounds inside the grinding section (200) to contaminate or waste is minimized.

[0169] The grinding control drive unit (290) includes a grinding control gear unit (2925) and a grinding control power unit (2921). When the grinding control gear shaft (2929) rotates due to the rotation of the grinding control power unit (2921), the grinding control gear (2927) coupled to the grinding control gear shaft (2929) can rotate. When the grinding control gear (2927) rotates, the rotating ring (261) of the grinding control rotating unit (260) will eventually rotate.

[0170] The above-mentioned rotating ring (261) may include a rotating ring through hole (2613) that penetrates along the axial direction of the first burr in a ring shape. On the outer surface of the rotating ring (261), which is the outer surface of the rotating ring (261), gear teeth are provided at a position corresponding to the grinding control gear (2927) so that they can mesh with the grinding control gear (2927). On the inner surface of the rotating ring (2612), which is the inner surface of the rotating ring (261), a rotating ring screw thread (2612a) in the form of a screw thread is provided so that the guide part projection (2621) can be screw-coupled.

[0171] The above-mentioned rotating ring (261) and the above-mentioned guide part (262) can each be fixed by a plurality of grinding control support parts (not shown) and a plurality of guide fixing parts (not shown) extending from the housing body (2412). When the rotating ring (261) is rotated by the protrusion stopper (2621a) shown in FIG. 4(b), the guide part (262) can move along the axial direction of the first burr rather than rotating along the rotating ring screw thread (2612a). Therefore, by using this, the gap between the first burr (231) and the second burr (232) can be adjusted, that is, the size of the grinding space can be adjusted, thereby controlling the size of the coffee powder being ground.

[0172] The above grinding control drive unit (290) can be coupled to one side of the coupling space (2811) through the drive coupling unit (2923) and the drive fastening unit (2924).

[0173] FIG. 5(a) illustrates the grinder assembly (210) separated from the support assembly (270). That is, when in use, it is connected to the coupling space (2811), but when not in use or for cleaning, the grinder assembly (210) can be separated. After separation, the first burr (231) and the second burr (232) are exposed, so they can be easily cleaned using a cleaning brush.

[0174] When the grinder assembly (210) is coupled to the coupling space (2811) formed in the grinder fixing part (281), it can be engaged with the gear teeth of the grinding gear part (2915), the grinding rotation part, the grinding control gear part, and the grinding control rotation part. To this end, the grinding rotation part (250) and the grinding control rotation part (260) can be connected to the grinding gear part (2915) and the grinding control gear part (2925) through the first communication hole (2413a) and the second communication hole (2413b), respectively.

[0175] FIG. 5(b) illustrates a first grinding section (211) and a second grinding section (212) separated. The second grinding section (212) may include a second burr (232), a burr coupling section (2122) coupled to the second burr (232), a fixed shaft (2128) penetrating the second burr (232) and the burr coupling section (2122) along the axial direction of the first burr, and a handle (2125) coupled to the burr coupling section (2122) to provide a gripping part.

[0176] The first grinding unit (211) may include a first burr (231), a grinding rotating unit (250) that rotates the first burr, a first bearing (2119a) and a second bearing (2119b) that rotatably connect the grinding rotating unit, a guide unit (262) that connects to the burr connecting unit (2122), and a rotating ring (261) that moves the guide unit along the axial direction of the first burr to adjust the degree of grinding. The grinding control rotating unit (260) may be positioned closer to the first burr outlet (2319) than the grinding rotating unit (250).

[0177] Additionally, the first grinding section (211) may include a first housing (241) that accommodates the first burr (231), the grinding rotating section (250) including a bearing section, and the grinding control rotating section (260), and a second housing (242) that is coupled to the first housing (241). The second grinding section (212) is inserted through the first opening (2411a) and the second through hole (2602) so that the second burr (232) can finally be inserted into the first burr through hole (2313). An example of the inserted second burr is shown in FIG. 5(c).

[0178] FIG. 5(c) illustrates the second burr (232) being inserted into the first burr through hole (2313) and the fixed shaft (2128) being inserted into and supported by the fixed shaft coupling groove (2421a). There may be a gap of h between the end of the groove of the fixed shaft coupling groove (2421a) and the inserted end of the fixed shaft (2128). This is because the fixed shaft (2128) is not completely fixed, but rather the circumferential surface of the fixed shaft (2128) is supported. Additionally, the gap may change as the guide part (262) moves along the axial direction (arrow direction) of the first burr when the grinding control rotating part (260) rotates. That is, the depth into which the fixed shaft (2128) is inserted can be adjusted to set the grinding degree. Through this, the size of the grinding space (238) can be adjusted. That is, the distance between the first burr (231) and the second burr (232) can be adjusted, specifically, the distance between the first burr blade (2316, see FIG. 3) and the second burr blade (23236, see FIG. 3) can be adjusted.

[0179] In other words, when the rotating ring (261) rotates due to the rotation of the grinding adjustment gear (2927), the guide part (262) can move along the axial direction of the first burr rather than rotating along the rotating ring thread (2612a). Therefore, the movement of the guide part (262) ultimately moves the burr coupling part (2122) coupled through the receiving space thread (2622a), and moving the burr coupling part (2122) means that the second burr (232) and the fixed shaft (2128) can be moved. Accordingly, the size of the grinding space can be adjusted—by adjusting the insertion depth between the first burr (231) and the second burr (232) or by adjusting the depth to which the fixed shaft (2128) is inserted into the fixed shaft coupling groove (2421a)—thereby adjusting the size of the ground coffee powder.

[0180] Adjusting the insertion depth of the first burr (231) and the second burr (232) means that the gap between the first burr blade (2316) and the second burr blade (2326) can be adjusted.

[0181] FIG. 6(a) illustrates an example of a coffee bean supply unit (100) that opens a capsule containing coffee beans by means of a capsule opening unit (110). In particular, it shows a protective body unit (190) and a capsule protective cover (199) that form an outer shell to protect the capsule opening unit (110).

[0182] A coffee extraction device (1000) may include a capsule mounting part (191) in which a capsule (700, see FIG. 7) in which coffee beans are stored is mounted, a capsule opening part (110) for opening the capsule (700) and discharging the coffee beans stored in the capsule (700), an opening gear part (170) including a first opening gear (171) for rotating the capsule opening part (110), a grinding part (200) connected to the capsule opening part (110) in the direction in which the coffee beans are discharged through the capsule opening part (110), and a grinding main gear (2916) connected to a grinding main gear shaft 0 that rotates the first opening gear (171) to grind the coffee beans discharged through the capsule opening part (110), and a grinding gear part (2915) located below the opening gear part (170) and rotating the grinding main gear (200) by the grinding main gear (2916). there is.

[0183] As illustrated in FIG. 6(a), when a coffee extraction device (1000) uses a capsule for supplying coffee beans, a capsule opening part (110) for opening the capsule (700) and a grinding part (200) located between the capsule opening part (110) and the extraction part (600) may be positioned to immediately grind the coffee beans discharged through the capsule opening part (100). The grinding part (200) may be attached to the lower part of the capsule opening part (110) so as to immediately grind the coffee beans discharged from the capsule opening part (110) to block contact with external contaminants and maintain freshness.

[0184] The grinding gear shaft (2916a), which is connected to the grinding gear (2916) and rotates the grinding gear (2916), may be further extended in the axial direction of the grinding gear shaft and connected to the first opening gear (171). That is, the grinding gear (2916) and the first opening gear (171) will both be connected to a single shaft called the grinding gear shaft (2916a) and rotate simultaneously. The diameter of the grinding gear (2916) may be larger than the diameter of the first opening gear (171). In addition, the rotational speed of the grinding unit (200) may generally be faster than the rotational speed of the capsule opening unit (110). This is because a lot of force and high speed are required for grinding coffee beans.

[0185] Preferably, the rotation speed of the capsule opening part (110) may be 60 RPM.

[0186] Referring to FIG. 6(c), the capsule mounting portion (191) on which the capsule is mounted may include a circular mounting body (1911) forming an outer shape, a mounting recess (1913) formed by a portion of the mounting body (1911) being recessed to a shape corresponding to the outer shape of the capsule opening (7135, see FIG. 7), and a bean drop hole (1915) formed by a portion of the mounting recess (1913) penetrating along the axial direction of the capsule opening portion (110).

[0187] The diameter of the recessed mounting portion (1913) may be larger than the diameter of the coffee bean drop hole (1915). That is, a part of the mounting body (1911) may be recessed and bent to form the recessed side surface (1911a) of the mounting recessed portion (1913). The recessed surface of the mounting recessed portion (1913) may be penetrated to form a mounting support surface (1911b) that supports the capsule when the coffee bean drop hole (1915) is formed. That is, the recessed side surface (1911a) forms the inner circumference of the mounting recessed portion (1913), and the mounting support surface (1911b), which is bent from the recessed side surface (1911a) and extends in the direction of the coffee bean drop hole (1915), can support the capsule (700) when the capsule is mounted in the mounting recessed portion (1913).

[0188] The size of the above bean drop hole (1915) is smaller than the outer diameter of the capsule and larger than the outer diameter of the first blade part (1111) to be described later, so that the capsule cannot enter the interior of the capsule opening part (110) through the above bean drop hole, but a plurality of first blades (1111a) provided in the first blade part (1111) can rise through the above bean drop hole (1915) to open the capsule.

[0189] Meanwhile, the above-mentioned recessed side (1911a) may be provided to correspond to the shape of the capsule body (710) near the capsule opening described later. If the capsule body (710) near the capsule opening is circular, the recessed side will also be provided in a corresponding circular shape, and if the capsule body (710) near the capsule opening is angular, the recessed side may also be provided in an angular shape. However, even if it is angular, it must be provided in the shape of a regular polygon so that the capsule closure can be torn uniformly in the radial direction. Therefore, even if the recessed part is angular in the shape of a regular polygon, the diameter of the recessed part can be calculated by using a circle circumscribed around the regular polygon.

[0190] The capsule mounting portion (191) may further include a capsule protective cover (199) to protect the capsule (700) or the mounting recess (1913) by being rotatably coupled to the mounting body (1911). The capsule protective cover (199) may be rotatably coupled to the mounting body (1911) through a protective cover coupling portion (195). A protective cover hinge coupling portion (1951) may be provided on a portion of the circumference of the mounting recess (1913) to be rotatably coupled to the capsule protective cover (199). For example, the capsule protective cover (199) may be hinge-coupled to the mounting body (1911) through the protective cover hinge coupling portion (1951).

[0191] The shape of the mounting body (1911) may vary, but preferably, it may be circular. The outer diameter of the mounting body (1911) may be larger than the outer diameter of the rotating body (1151) of the capsule opening part (110) to be described later. Therefore, the outer surface of the mounting body (1911) may not come into contact with the outer surface of the capsule opening part. This is to further include a protective body part (190) to prevent the coffee beans from being contaminated during capsule opening and coffee bean grinding.

[0192] The capsule opening part (110) may be equipped with a protective frame (193) to be coupled to the coffee extraction device (1000). The protective frame (193) may be coupled to the upper side of the grinder case (280). Specifically, it may be coupled to the gear support part (910) and the grinder fixing part (281) so that when the capsule opening part (110) opens the capsule, the coffee beans discharged from the capsule can be connected to enter the grinding part (200), or more precisely, the first grinding part inlet (2111).

[0193] At this time, the protective body part (190) may include a side protective body (192) that connects the protective frame (193) and the mounting body (1911) to protect the outer surface of the capsule opening part (110). Ultimately, the mounting body (1911), the protective frame (193), and the side protective body (192) can perform the role of protecting the capsule opening part (110).

[0194] Preferably, the side protection body (192) may be made of a transparent material. This is because it allows the user to directly check whether the actual coffee extraction device is operating and whether a large amount of scattered coffee grounds has accumulated and requires cleaning, and it is also excellent in terms of design.

[0195] Additionally, the opening gear part (170) can be protected by a gear protection cover (285) being coupled to a protection frame (193).

[0196] FIG. 6(b) shows a cross-section of a coffee extraction device along the plane marked S in FIG. 6(a). A rotating ring gear (1152) having a gear tooth shape is shown, which is provided on the outer surface of the driver rotating part (115) to be described later within the capsule opening part (110). Since the driver rotating part (115) has a ring shape with both ends open, the second housing (242) of the grinding part (200) and the first grinding part inlet (2111) are shown inside the rotating ring gear (1152). The driver rotating part (115) can be rotated through the rotation of the rotating ring gear (1152). To this end, an opening gear part (170) that transmits rotational force to the rotating ring gear (1152) can be coupled to one side of the capsule opening part (110).

[0197] The above opening gear section (170) includes a first opening gear (171) connected to the grinding main gear shaft (2916a) and rotating simultaneously with the grinding main gear (2916). Additionally, it may include a second opening gear (172) that rotates by meshing with the first opening gear (171) and the rotating ring gear (1152). The second opening gear (172) may function as a type of idler gear.

[0198] When the rotational force generated through the grinding drive unit (290) passes through the planetary gear unit (2913) and is transmitted to the grinding main gear shaft (2916a), the grinding main gear (2916) and the first opening gear (171) connected to the grinding main gear shaft (2916a) will rotate simultaneously. Accordingly, along with the opening of the capsule closing unit (750), the coffee beans discharged from the capsule will immediately enter the grinding unit (200) and be ground into coffee powder.

[0199] FIGS. 7(a) to 7(d) show a circular capsule mounted in the capsule mounting portion (191) and a cross-section thereof. After placing a capsule (700) containing the desired type of coffee beans in the mounting recess (1913), the user can open the capsule through the capsule opening portion (110) by turning on the power.

[0200] The capsule (700) may include a capsule body (710) having a capsule opening (7135) that is open on one side, and a capsule closing part (750) that closes the capsule opening (7135) after coffee beans are placed into the capsule body (710) through the capsule opening (7135).

[0201] The capsule closure part (750) may be provided in the form of a thin film or as a capsule lid using screw connection. Here, it is shown as an example provided in the form of a thin film.

[0202] The reason coffee beans are packaged in small capsules is to maintain freshness and a consistent taste. Ground coffee beans or coffee powder oxidize rapidly, so even if stored in optimal conditions, they lose their original flavor due to oxidation within about a week.

[0203] Accordingly, in the present disclosure, coffee beans that have been roasted and are not ground can be provided in the form of small capsules capable of extracting about one cup for one person.

[0204] One-cup capsules can be produced in various three-dimensional shapes. Additionally, the capsule must maintain a sealed form to preserve the freshness of the coffee beans and possess sufficient pressure resistance to withstand the pressure caused by gases released from the beans during storage. To this end, the capsule may be manufactured from rigid materials such as plastic or aluminum; however, for ease of opening, it may be packaged in a separate sealed plastic container with an easy-opening structure.

[0205] Additionally, a barcode indicating the coffee beans contained inside the capsule may be printed on the outer surface of each capsule. When a user mounts a capsule containing the desired type of coffee beans into the mounting recess (1913) and turns on the power, the corresponding barcode is read, and dripping and extraction can be automatically performed according to recipe information, such as the amount of water and dripping method optimized for each coffee bean, which is pre-set.

[0206] To this end, the capsule mounting part (191) may further include a scanner (not shown) that recognizes a barcode printed on the outer surface of the capsule (700). When the type of coffee beans contained in the capsule is recognized through the scanner, the control unit (not shown) rotates the grinding adjustment gear unit (2925) to adjust the degree of insertion of the second burr (232) into the first burr (231) in order to adjust the grinding degree according to the type of coffee beans, and rotates the grinding gear unit (2915) and the opening gear unit (170) to grind the coffee beans discharged together with the opening of the capsule.

[0207] FIG. 7(a) illustrates a capsule having a circular capsule body including a capsule opening on one side. Additionally, a film-shaped capsule closure (750) is attached to the capsule opening. The capsule closure (750) and the capsule body will form a storage space for storing coffee beans.

[0208] The driver part (111) of the capsule opening part (110) described later will use a blade to penetrate and tear the film-shaped capsule closing part (750), and then open the film-shaped capsule closing part (750) through rotation so that the coffee beans can be easily discharged.

[0209] FIG. 7(c) illustrates an example in which the capsule body has the same function but has an angular shape. This is to prevent the capsule from rotating together with the driver part (111) when the driver part (111) rotates. Corresponding to the angular shape of the capsule body, the mounting recess may also be provided in an angular shape; in this case, the angular shape prevents the capsule from rotating and can be fixed.

[0210] Although roasted beans may oxidize more slowly than ground coffee powder, they can still easily oxidize due to contact with air, so sealed packaging is desirable. Additionally, since carbon dioxide is continuously released from the beans stored in the capsule, the capsule must be able to withstand the resulting expansion pressure. Furthermore, after the capsule is opened, all the beans must be discharged to the grinding section (200). The present disclosure illustrates an embodiment in which beans are transferred from a capsule opened by free fall to the grinding section (200). A capsule in which beans are discharged in this manner may be advantageous in terms of separation, disposal, and recycling compared to a capsule in which coffee powder is stored.

[0211] In one embodiment of the capsule, both the capsule body (710) and the film-shaped capsule closure (750) may be formed from aluminum. That is, by manufacturing the entire capsule from aluminum, the entire capsule can be recycled, it can withstand the pressure of gases such as carbon dioxide well, and has low oxygen permeability, which has the advantage of allowing the film to be easily opened.

[0212] FIG. 8(a) shows an exploded view of an example of a capsule opening part. FIG. 8(b) shows an example of a driver part. FIG. 8(c) shows a top view of the driver part.

[0213] Referring to FIG. 8(a), the capsule opening part (110) may include a driver part (111) for opening the capsule closing part (750) and a driver rotation part (115) for moving and rotating the driver part (111) in the direction where the capsule closing part is located through rotation to open the capsule closing part (750) and send it to the crushing part (200).

[0214] That is, the driver rotation part (115) can move the driver part (111) from an initial position to a preset opening height through rotation, and then rotate the driver part (111).

[0215] To this end, the driver rotation part (115) may include a cylindrical rotating body (1151) with both ends open, which receives rotational force from the opening gear part (170) and rotates, and forms a driver installation space (915) in which the driver part (111) is located, a capsule mounting part coupling member (1159) located at one end of the rotating body (1151) and coupled with the capsule mounting part (191), a bean outlet (1156) located at the other end of the rotating body (1151) through which beans discharged from the mounted capsule (700) are discharged toward the grinding part (200), and a driver movement guide part (113) located between the driver part (111) and the rotating body (1151) in the driver installation space (915) and rotates together with the rotating body (1151) to move and rotate the driver part (111).

[0216] Additionally, the driver moving guide part (113) may include a ring-shaped moving ring body (1131) that forms the outer shape of the driver moving guide part, and a moving screw projection (1133) that is located on the inner circumference of the moving ring body (1131) and is coupled with a plurality of body protrusions (1118a) that protrude from the outer circumference of the driver body (1118).

[0217] In addition, at one end of the moving screw projection (1133) located in the direction where the capsule mounting part coupling (1159) is located, the moving screw projection (1133) includes a moving stopper (1133a) that prevents the driver part (111) from rising higher than the opening height. FIG. 8(a) illustrates an example in which the moving stopper (1133a) is provided in the form of a projection.

[0218] An example is illustrated in which a stopper is not provided at the other end of the moving screw projection (1133) located in the direction of the coffee bean outlet (1156) among the two ends of the moving screw projection (1133), but alternatively, a stopper similar in shape to the moving stopper (1133a) may be provided at the other end of the moving screw projection (1133).

[0219] Additionally, the driver moving guide part (113) further includes a plurality of fixed protrusions (1132) provided on the outer surface of the moving ring body (1131), and the rotating body (1151) further includes a plurality of inner fixed guides (1153) on the inner surface of the rotating body (1151) corresponding to the plurality of fixed protrusions (1132), so that when the plurality of fixed protrusions (1132) and the plurality of inner fixed guides (1153) are combined and receive rotational force from the opening gear part (170), the rotating body (1151) and the driver moving guide part (113) can rotate simultaneously.

[0220] In order to receive rotational force from the opening gear unit (170), the driver rotation unit (115) includes a gear tooth-shaped rotating ring gear (1152) on the outer surface of the rotating body (1151), and the rotating ring gear (1152) meshes with the opening gear unit (170) to transmit the rotational force of the opening gear unit (170) to the driver rotation unit (115).

[0221] Specifically, the first opening gear (171) rotates to mesh with the second opening gear (172) and rotate, and the rotating ring gear (1152) meshed with it will rotate. When the rotating body (1151) rotates due to the rotation of the rotating ring gear (1152), the driver moving guide part (113) will rotate by means of the plurality of fixed protrusions (1132) coupled to the plurality of inner fixed guides (1153).

[0222] The rotation of the driver movement guide part (113) means the rotation of the movable ring body (1131). The movable screw projection (1133) provided on the inner circumference of the movable ring body (1131) can be screw-coupled with the body protrusion (1118a). When the rotating body (1151) and the movable ring body (1131) are fixedly coupled to each other and rotate, the driver part (111) will move along the inclined surface of the movable screw projection (1133). That is, since the movable ring body (1131) rotates relatively, the driver part (111) will move in a direction closer to or further away from the capsule, or in an up-and-down direction.

[0223] For example, when the first opening gear (171) rotates in the first rotational direction, the rotating body (1151) and the moving ring body (1131) can rotate in the first rotational direction. At this time, the driver part (111) can move in the direction of the capsule mounting part coupling member (1159) because the moving screw projection (1133) rotates relatively.

[0224] Since the driver unit (111) only needs to move to a height where it can open the capsule and smoothly discharge the coffee beans, the movement of the driver unit (111) can be made up to a preset opening height. The opening height refers to the distance the driver unit (111) moves from the coffee bean outlet (1156) toward the capsule mounting part coupling (1159). Or it refers to the maximum distance the driver unit (111) can move from its initial position.

[0225] The above opening height can be determined by the moving stopper (1133a). That is, when the driver part (111), which was moving along the inclined surface of the moving screw projection (1133), encounters the projection-shaped moving stopper (1133a) provided at one end of the moving screw projection (1133), the driver part (111) can no longer move. Instead, the driver part (111) will rotate at the same speed as the rotating body (1151) and the moving ring body (1131).

[0226] Therefore, eventually, the driver part (111) will move from the initial position to the opening height and then rotate.

[0227] If the first opening gear (171) rotates in a second rotation direction opposite to the first rotation direction, the driver part (111) will move toward the coffee bean outlet (1156). FIG. 7(a) illustrates an example in which there is no stopper similar in shape to the moving stopper (1133a) at the other end of the moving screw projection (1133). On the inner surface of the rotating body (1151), an inner support projection (1154) may be provided at the lower part of the moving screw projection (1133) and spaced apart from the moving screw projection (1133). That is, provided between the other end of the moving screw projection (1133) and the coffee bean outlet (1156), the driver part (111) can no longer move toward the coffee bean outlet (1156) and can only rotate. The driver part (111) that comes out of the other end of the moving screw projection (1133) will rotate freely while its movement is restricted by the inner support jaw (1154).

[0228] However, when the first opening gear (171) rotates again in the first rotational direction, the driver part (111) will enter the other end of the moving screw projection (1133) and move again along the inclined surface of the moving screw projection (1133) toward the capsule mounting part coupling (1159).

[0229] Accordingly, the preset initial position refers to the position where the driver part (111) exits the moving screw projection (1133) and is caught by the inner support jaw (1154). Even in the initial position, the upper portion of the plurality of first blades (1111a) may be higher from the inner support jaw (1154) than the vertical height from the inner support jaw (1154) to the coffee bean drop hole (1915). Therefore, in the initial position, the upper portion of the plurality of first blades (1111a) may be positioned above the coffee bean drop hole (1915). Accordingly, when a user mounts a capsule to the capsule mounting part (191), the film-shaped capsule closure part may be pierced by the plurality of first blades (1111a).

[0230] Referring to FIG. 8(b), the vertical height of each of the plurality of first blades (1111a) can gradually increase as they move further away from the driver hub (1112). This is to open the film-shaped capsule closure (750) more efficiently. Accordingly, the upper portion of the plurality of first blades (1111a) may preferably refer to the edge portion that moves away from the driver hub (1112).

[0231] FIG. 8(b) illustrates an example of a driver unit (111). The driver unit (111) performs the function of opening a capsule (700). To this end, the driver unit (111) may include a driver hub (1112) that provides a center of rotation, a plurality of first blades (1111a) that open the capsule (700), a first blade unit (1111) in which one end of each of the plurality of first blades (1111a) is connected to the driver hub (1112), a ring-shaped driver body (1118) that surrounds the driver hub (1112), and a second blade unit (1119) that is located below the first blade unit (1111) and includes a plurality of second blades (1119a) that open the capsule (700) together with the first blade unit (1111) to guide the coffee beans stored in the capsule (700) to be discharged toward the grinding unit (200), and connects the driver hub (1112) and the driver body (1118).

[0232] The driver body (1118) is provided in a ring shape and is connected to the driver hub (1112) by a plurality of second blades (1119a). A plurality of first blades (1111a) may be provided on the upper portions of the plurality of second blades (1119a), which are connected to the driver hub (1112) at a predetermined distance from the second blade portion (1119).

[0233] The driver hub (1112) may be provided in a cone shape at the location connected to the first blade part (1111) and in a cylinder shape at the location connected to the second blade part (1119). This is to prevent the coffee beans from accumulating on the driver hub (1112) when they fall from the capsule (700), as the driver hub (1112) has a cone shape.

[0234] Referring to FIG. 8(b), the vertical height of the plurality of first blades (1111a) can increase as they move further away from the driver hub (1112). This is to open the film-shaped capsule closure (750) more efficiently. By having this height difference, when the plurality of first blades (1111a) penetrate the capsule closure (750), the capsule closure can be torn from the outside inward and gradually to the center. The outer side of the capsule closure (750) must be torn first so that the film forming the capsule closure (750) maintains tension, allowing the capsule closure (750) to be torn easily when the plurality of first blades (1111a) come into contact with the center. If tension is not maintained, the film that is partially torn may not be further torn by the first blade part (1111) and the second blade part (1119) and the torn film may not be opened to discharge coffee beans, but merely deformed by the first blade part (1111) and may not tear easily.

[0235] Additionally, the plurality of first blades (1111a) may each be provided with a curved shape that becomes more inclined in the first direction as they move further away from the driver hub (1112).

[0236] After the edge portion of the capsule closure (750) is torn first, the area of ​​the torn capsule closure decreases as it moves toward the center of the capsule closure (750). This is because, at the same angle, the arc length increases as the radius increases, and the area of ​​the sector increases by the square of the radius. Therefore, as the size or length of the torn film increases as it moves further away from the center in the radial direction, more deformation must be applied to the film so that the torn film can be separated and the coffee beans can be discharged more effectively.

[0237] Referring to FIG. 8(c), the ring-shaped driver body (1118) may have a coffee bean communication hole (1115) inside. Through the coffee bean communication hole (1115), the coffee beans discharged from the capsule (700) will move into the interior of the rotating body (1151) and will move to the grinding unit (200) through the coffee bean outlet (1156).

[0238] The above-mentioned bean vent hole (1115) can be divided into multiple sections by multiple second blades (1119a). The size of the partitioned bean vent hole (1115) is provided to be larger than the size of a single bean so that the bean can naturally pass through. The bean passing through the above-mentioned bean vent hole (1115) will move to the grinding section (200) through the above-mentioned bean outlet (1156). Specifically, it will enter the interior of the grinding section (200) through the first grinding section inlet (2111, see FIG. 6(b)) provided in the second housing (242, see FIG. 6(b)) of the grinding section.

[0239] Additionally, the inclination direction of the first wing surface (1111b) of each of the multiple first blades may be opposite to the inclination direction of the second wing surface (1119b) of each of the multiple second blades. This is because when the film-shaped capsule closure (750), which is torn and opened by the first blade section (1111), meets the second blade section (1119) which rotates at an inclination in the opposite direction, the film flutters more, making it easier to discharge the coffee beans.

[0240] FIG. 9(a) illustrates a case where a user mounts a capsule on a capsule mounting part (191) and multiple first blades (1111a) penetrate the capsule closing part and are inserted into the capsule. FIG. 9(b) illustrates a case where multiple first blades (1111a) are vertically moved to a maximum height equal to a preset opening height and inserted into the capsule.

[0241] When a capsule containing the type of coffee beans desired by the user is mounted in the capsule mounting part (191), the edge of the capsule closing part (750) will be torn by a plurality of first blades (1111a) as described above. Accordingly, a portion of the upper part of the plurality of first blades (1111a) will penetrate the capsule closing part (750) and be inserted into the capsule.

[0242] In other words, when the capsule is mounted on the capsule mounting portion, the upper portion adjacent to the free end of each of the plurality of first blades can penetrate a part of the corresponding capsule closing portion and be inserted into the interior of the capsule body.

[0243] When the user turns on the power and rotates the opening gear part (170), the driver rotation part (115) will rotate together with the driver movement guide part (113) fixed inside, and accordingly, the driver part (111) will move along the movement screw projection (1133) to the opening height. Through this, as shown in FIG. 9(b), when mounted, a plurality of first blades (1111a) will be inserted into the interior of the capsule with the edge of the capsule closing part (750) torn. Therefore, the capsule closing part (750) will be torn in the shape of the plurality of first blades, and the capsule closing part (750) and the capsule body will remain attached at the edge of the capsule opening (7135).

[0244] And, when the driver part (111) that has moved to the opening height meets the moving stopper (1133a) provided at one end of the moving screw projection (1133), the driver part (111) is no longer restricted from moving and only rotates, so a part of the edge of the capsule closing part (750) will be torn by the plurality of first blades (1111a) and will flutter according to the rotation of the driver part (111). That is, the capsule closing part (750), which is torn in the shape of the plurality of first blades (1111a) by the movement of the driver part (111), will be further torn by the plurality of first blades (1111a) by the rotation of the driver part (111) so that the coffee beans begin to be discharged, and the torn or opened capsule closing part (750) will flutter by the plurality of first blades (1111a). Since the above plurality of first blades (1111a) are inclined in the first direction, smoother flapping is possible.

[0245] Ultimately, the opened area of ​​the capsule is increased, allowing the stored coffee beans to be discharged smoothly through the coffee bean outlet (1156). Additionally, the film-shaped capsule closure (750) is not completely torn and separated from the capsule body (710) by the rotation of the plurality of first blades (1111a), but is torn only enough to allow the internal coffee beans to be discharged properly while fluttering. Meanwhile, referring to FIG. 8(c), if the plurality of first blades (1111a) are inclined in the first direction, the plurality of second blades (1119a) may be inclined in the opposite direction, the second direction. Through this, the coffee beans can be discharged more smoothly.

[0246] FIG. 9(c) shows a cross-section in which, when the driver part (111) is in the initial position, a capsule is mounted and a portion of the edge of a plurality of first blades (1111a) is inserted through the capsule closure part (750). Referring to FIG. 9(d), it is shown that the driver part (111) has moved from the initial position shown in FIG. 9(c) to the opening height along the direction indicated by the arrow. That is, the driver part (111) is designed to move a distance indicated by h from the initial position to the opening height.

[0247] The coffee beans opened from the capsule will pass through the coffee bean communication hole (1115) of the driver part (111), pass through the coffee bean outlet (1156) of the driver rotation part (115), and move to the grinding part (200). Since the coffee beans are discharged through the interior of the rotating body (1151), contamination can be minimized. In addition, a rotating ring gear (1152) is provided on the outer surface of the rotating body (1151) to eliminate the need for a driving component for driving the rotating body (1151) to be installed inside the rotating body (1151), so that the rotating body (1151) can rotate through the outer surface without a separate shaft.

[0248] FIG. 10 illustrates an example of a control method for the capsule opening unit (110). The control method of the present disclosure first undergoes an input detection step (S50) in which a user inputs the start of the coffee extraction device (1000) after attaching a capsule (S50). The start by the user may be input by touching a display (not shown), or by a button or switch method, or by a voice recognition method. After the input detection step, when the start by the user is confirmed, the control method of the present disclosure can recognize whether the capsule is genuine (S100) by reading the barcode marked on the outer surface of the capsule using a scanner (not shown) located in the capsule attachment unit (191). If it is not genuine, it can proceed to an error display step (S150) in which the non-genuine capsule is indicated through a display unit (not shown). If the capsule is determined to be genuine, the control method of the present disclosure can also recognize the type of coffee bean (S200) through the barcode. In contrast, it is acceptable for the identification of genuine capsules and the recognition of coffee bean types to occur simultaneously.

[0249] When the type of coffee bean is recognized, the grinding degree setting is changed through the rotation of the grinding adjustment gear, and rotational force is transmitted through the grinding drive unit to simultaneously rotate the grinding main gear (2916) and the first opening gear (171) in the first rotational direction, thereby undergoing a first rotational step (S300). In the first rotational step (S300), the driver unit (111) will move from the initial position to the opening height and then rotate.

[0250] The first rotation step (S300) above may continue until a preset grinding time elapses (S400). The grinding time may vary depending on the type of coffee beans.

[0251] When the above grinding time elapses (S400), the control method of the present disclosure can determine that all the coffee beans stored in the capsule have been discharged and ground. Accordingly, the control method of the present disclosure will return the second burr (232), whose position was adjusted to control the degree of grinding, to its position before adjustment. Then, the grinding main gear (2916) and the first opening gear (171) will be rotated in a second rotation direction opposite to the first rotation direction, thereby repositioning the driver unit (111) to its initial position. That is, the control method of the present disclosure can proceed with a second rotation step (S500) to return the driver unit (111) from the opening height to the initial position through rotation in the second rotation direction. The second rotation step (S500) will continue until a preset return time elapses (S600). Afterwards, water will be supplied through the water supply unit (400) to extract coffee.

[0252] The present disclosure may be modified and implemented in various forms, and its scope of rights is not limited to the embodiments described above. Accordingly, if a modified embodiment includes the components of the claims of the present disclosure, it should be considered to fall within the scope of the present disclosure. Explanation of the symbols

[0253] 1000: Coffee extraction device 100: Bean supply unit 110: Capsule opening unit 111: Driver section 1112: Driver hub 1115: Coffee bean pipe hole 1117: Capsule fastening head 1118: Driver body 1118a: Body protrusion 113: Driver movement guide part 1131: Moving ring body 1132: Fixed protrusion 1133: Moving screw projection 115: Driver rotating part 1151: Rotating body 1152: Rotating ring gear 1153: Inner fixed guide 1154: Inner support jaw 1156: Bean outlet 1159: Capsule mounting joint 170: Opening gear 171: 1st opening gear 172: 2nd opening gear 1721: Opening gear shaft 191: Capsule loading section 1911: Mounting body 1915: Bean drop hole 192: Side protection body 193: Protection frame 200: Crushing part 400: Water supply unit 600: Extraction unit 700: Capsule 800: Coffee Server 910: Gijibu 920: Bass

Claims

Claim 1 A coffee extraction device comprising: a capsule mounting part in which a capsule containing coffee beans is mounted; a capsule opening part for opening the capsule and discharging the coffee beans stored in the capsule; an opening gear part including a first opening gear for rotating the capsule opening part; a first burr for grinding the coffee beans discharged through the capsule opening part by being coupled to the capsule opening part in the direction in which the coffee beans are discharged through the capsule opening part; and a grinding part including a second burr for forming a grinding space for grinding the coffee beans together with the first burr; a through hole vertically penetrating the grinding part; and a grinding gear part including a grinding gear connected to a grinding gear shaft that rotates the first opening gear, and located below the opening gear part to prevent contamination of the grinding gear by rotating the first burr by the grinding gear. Claim 2 A coffee extraction device according to claim 1, wherein the capsule opening part comprises: a driver part for opening the capsule; and a driver rotation part for moving and rotating the driver part in the direction where the capsule is located through rotation to open the capsule and send it to the grinding part. Claim 3 A coffee extraction device according to claim 2, wherein the driver part comprises: a driver hub providing a center of rotation; a first blade part including a plurality of first blades for opening the capsule, wherein one end of each of the plurality of first blades is connected to the driver hub; a ring-shaped driver body surrounding the driver hub; and a second blade part located below the first blade part, comprising a plurality of second blades that open the capsule together with the first blade part to guide the coffee beans stored in the capsule to be discharged toward the grinding part, and which connects the driver hub and the driver body. Claim 4 A coffee extraction device according to claim 3, wherein each of the plurality of first blades is inclined in a first direction, and each of the plurality of second blades is inclined in a second direction opposite to the first direction. Claim 5 A coffee extraction device according to claim 4, characterized in that each of the plurality of first blades is provided with a curved shape that becomes more inclined in the first direction as it moves further away from the driver hub. Claim 6 A coffee extraction device according to either claim 3 or claim 5, wherein each of the plurality of first blades has a vertical height that increases as it moves away from the driver hub. Claim 7 A coffee extraction device according to claim 6, characterized in that when the capsule is mounted in the capsule mounting part, the upper portion adjacent to the free end of each of the plurality of first blades penetrates a part of one surface of the corresponding capsule and is inserted into the interior of the capsule. Claim 8 In paragraph 3, the driver part further comprises a plurality of body protrusions formed on the outer surface of the driver body, and the driver rotating part rotates by receiving the rotational force of the opening gear part and forms a driver installation space in which the driver part is located inside, and is a cylindrical rotating body with both ends open; a capsule mounting part coupling member located at one end of the rotating body and coupled with the capsule mounting part; a bean outlet located at the other end of the rotating body through which coffee beans discharged from the mounted capsule are discharged toward the grinding part; and a driver moving guide part located between the driver part and the rotating body in the driver installation space and rotates together with the rotating body to move and rotate the driver part; wherein the driver moving guide part comprises a ring-shaped moving ring body forming the outer shape of the driver moving guide part; and a moving screw projection located on the inner surface of the moving ring body and coupled with the body protrusions. A coffee extraction device characterized by including: a moving stopper at one end of the moving screw projection located in the direction where the capsule mounting portion is located among the two ends of the moving screw projection, which prevents the driver portion from rising higher than a preset opening height. Claim 9 A coffee extraction device according to claim 8, characterized in that the moving stopper is in the form of a projection bent toward the capsule mounting portion along the axial direction of the moving ring body at one end of the moving screw projection. Claim 10 A coffee extraction device according to claim 9, wherein the driver moving guide part further comprises a plurality of fixed protrusions provided on the outer surface of the moving ring body, and the rotating body further comprises a plurality of inner fixed guides on the inner surface of the rotating body corresponding to the plurality of fixed protrusions, so that the plurality of fixed protrusions and the plurality of inner fixed guides are coupled, and the rotating body and the driver moving guide part rotate simultaneously. Claim 11 A coffee extraction device according to claim 10, wherein the rotating body includes a gear-tooth-shaped rotating ring gear on the outer surface of the rotating body, and the rotating ring gear engages with the opening gear part to transmit the rotational force of the opening gear part to the driver rotating part. Claim 12 A coffee extraction device according to claim 1, wherein the capsule mounting portion comprises: a circular mounting body forming the outer shape of the capsule mounting portion; a mounting recess formed by recessing a part of the mounting body to form a shape corresponding to the outer shape of the capsule; and a coffee bean drop hole formed by penetrating a part of the mounting recess along the axial direction of the capsule opening portion. Claim 13 A coffee extraction device according to claim 12, wherein the capsule mounting portion further comprises a capsule protective cover rotatably coupled to the mounting body to protect the capsule or the mounting recess. Claim 14 A coffee extraction device according to claim 8, wherein the capsule mounting part comprises: a circular mounting body that forms the outer shape of the capsule mounting part and is coupled to the capsule mounting part coupling member; a mounting recess formed by a portion of the mounting body being recessed to form a shape corresponding to the outer shape of the capsule; and a coffee bean drop hole formed by penetrating a portion of the mounting recess along the axial direction of the capsule opening part, wherein the outer diameter of the mounting body is larger than the diameter of the rotating body. Claim 15 A coffee extraction device according to claim 14, characterized in that the diameter of the coffee bean drop hole is larger than the outer diameter of the first blade part. Claim 16 A coffee extraction device according to claim 12 or 14, further comprising: a protective frame supporting the capsule opening portion; and a side protective body protecting the side of the capsule opening portion connecting the mounting body and the protective frame, wherein the side protective body is provided with a transparent material. Claim 17 A coffee extraction device according to claim 1, wherein the capsule opening part comprises: a driver part that opens the capsule through rotation; and a driver rotation part that moves the driver part in the direction where the capsule is located and rotates it to open the capsule and send it to the grinding part; and the grinding part further comprises: the first burr and the second burr; a first burr penetration hole that penetrates the first burr in the axial direction; a first burr inlet located at one end of the first burr penetration hole for introducing the coffee beans; a first burr outlet located at the other end of the first burr penetration hole for discharging the ground coffee beans as coffee powder; a grinding rotation part coupled to the outer surface of the first burr to rotate the first burr; and a grinding power part that generates rotational force for rotation of the grinding rotation part; wherein the grinding main gear shaft is connected to the grinding power part and rotates by the grinding power part, and the first opening gear is coupled to the grinding main gear shaft at the upper part of the grinding main gear to transmit the rotational force of the grinding power part to the driver rotation part. Claim 18 A coffee extraction device according to claim 17, wherein the driver rotating part comprises: a cylindrical rotating body having both ends open, which receives the rotational force of the opening gear part and forms a driver installation space in which the driver part is located; and a rotating ring gear in the shape of gear teeth on the outer surface of the rotating body; and wherein the opening gear part further comprises a second opening gear that connects the first opening gear and the rotating ring gear to rotate the rotating body. Claim 19 A control method for a coffee extraction device comprising: a capsule mounting part for mounting a capsule in which coffee beans are stored; a capsule opening part for opening the capsule and discharging the coffee beans stored in the capsule; a first opening gear located on the side of the capsule opening part for rotating the capsule opening part; a first burr located in the direction in which coffee beans are discharged through the capsule opening part for grinding the coffee beans discharged through the capsule opening part, a first burr penetration hole penetrating along the axial direction of the first burr, and a second burr inserted inside the first burr penetration hole to form a grinding space for grinding the coffee beans together with the first burr; and a grinding rotation part coupled to the outer surface of the first burr to rotate the first burr; wherein, after detecting a user's start input, the grinding rotation part connected to the grinding cycle gear shaft and the capsule opening part are rotated in a first rotation direction for a preset grinding time; A control method for a coffee extraction device comprising: a second rotation step of rotating the grinding cycle gear shaft in a second rotation direction opposite to the first rotation direction during a preset return time after the grinding time has elapsed.

Images