JP2017200527A - coffee maker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small-sized inexpensive coffee maker having little miscellaneous taste and astringency, capable of extracting various coffee tastes together with approximately constant taste.SOLUTION: In a coffee maker having a steam generator 35 and an extractor 40, 60, the steam generator has steam generation means 36 and steam detection means 37, and the extractor communicates with the steam generator through a passage having an electromagnetic valve V3, and the electromagnetic valve is opening/closing controlled based on a signal from the steam detection means, and while extracting coffee, liquid in the extractor is pressed from the upper side by steam generated from the steam generator.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a coffee maker, and more particularly to a coffee maker that applies a vapor pressure above an extraction liquid (mainly hot water) to extract coffee at a stretch with the vapor pressure.

  In general, the extraction method of coffee is a drip method in which hot water is poured into coffee powder in a filter for extraction, a siphon method in which hot water moved upward using the difference in vapor pressure is extracted into coffee powder, and coffee There are known an espresso method in which boiling water is filtered and extracted through a filter containing powder under pressure, and a French press method or an aero press method in which air pressure is applied to a mixture of coffee powder and hot water for extraction.

  And, for example, the above-mentioned aero press type can finish the extraction before the coffee taste becomes high by increasing the extraction speed, so it is possible to obtain a coffee with a refreshing taste with less miscellaneous taste, A manual type that applies air pressure by hand or an air pump type that applies air pressure with an air pump is known.

  FIG. 6 shows an example of an aero press type coffee maker using an air pump used in a vending machine. The extraction device 1 shown in the figure includes a filter unit 4 including a mixed liquid tank 2, an extraction tank 3, and a filter 4a.

  The liquid mixture tank 2 and the extraction tank 3 are integrated with a central portion that can be moved up and down, and a central throttle portion has an on-off valve 5 that can be moved up and down separately.

  In addition, an air introduction pipe 7 in which an air pump 6 is interposed communicates with the upper side wall portion of the extraction tank 3, and a discharge pipe 9 having a pipe opening / closing mechanism 8 communicates with the lower end of the filter section 4. The tube opening / closing mechanism 8 includes a cam 10, a pressing member 11, and a flexible tube 12.

  A liquid mixture 13 of a predetermined amount of hot water and a predetermined amount of coffee powder is put in the liquid mixture tank 2 in advance, and the open / close valve 5 and the pipe open / close are opened during coffee extraction when the vending machine is switched on. The mechanism 8 is opened for a predetermined time. First, a predetermined amount of the mixed solution 13 is introduced into the extraction tank 3.

  Next, the air pump 6 is activated, and the pressurized air acts above the mixed liquid 13 in the extraction tank 3. As a result, the mixed liquid 13 in the extraction tank 3 is pushed by the pressurized air, passes through the filter 4a in a short time, and extracts coffee with less miscellaneous taste.

  The extracted coffee is led out from the lead-out pipe 9, and when a predetermined time elapses, the on-off valve 5 and the pipe opening / closing mechanism 8 are closed, and the air pump 6 is stopped. The tube opening / closing mechanism 8 is closed when the cam 10 rotates, the pressing member 11 moves downward, and the flexible tube 12 is crushed and closed (see Patent Document 1).

  By the way, the said conventional thing uses an air pump, and while the whole apparatus becomes large-sized, cost will rise by the part which uses an air pump.

  In addition, only a predetermined amount of pressurized air is supplied from the air pump. For example, when the amount of coffee powder changes, the same coffee taste cannot be extracted.

  In addition, the above-described manual aero-press type is smaller and less expensive because it does not use an air pump, but there is a problem that the variation in coffee taste increases due to the temperature of hot water during extraction and the manner of pressurization. have.

  In addition, the above-mentioned aero press type pressurizes the mixed liquid from above, and inevitably has a problem that the liquid and the coffee powder are agitated and turbid when the pressurized air is introduced, resulting in increased astringency. .

Japanese Patent Laid-Open No. 11-4768

  An object of the present invention is to provide a coffee maker that eliminates such problems, is small and low cost, has little miscellaneous taste and astringency, and can extract various coffee tastes with a substantially constant taste. .

  In order to achieve the above object, the present invention adopts the following configuration.

  The invention according to claim 1 is a coffee maker having a steam generator and an extraction device (for example, the extraction liquid tank 40 and the filter unit 60), wherein the steam generator includes a steam generator and a steam detector. The extraction device communicates with the steam generation device via a path having a solenoid valve (for example, a third solenoid valve V3), and the solenoid valve is controlled to open and close based on a signal from the steam detection means. In addition, at the time of coffee extraction, the liquid of the extraction device is pushed from above by the steam generated by the steam generation device.

  In the invention which concerns on Claim 2, it is a coffee maker which has a steam generator and an extraction apparatus, Comprising: The said steam generator has a steam generation means and a steam detection means, The said extraction apparatus has a heating means It has an extraction liquid tank and a filter unit, and communicates with the steam generator via a path having a solenoid valve (for example, a third solenoid valve V3). Based on the opening / closing control, the extraction liquid tank's heated liquid is pushed from above by the steam generated by the steam generator and reaches the filter unit during coffee extraction.

  In addition to the structure of Claim 2, in the invention which concerns on Claim 3, the structure which has another solenoid valve (for example, 4th solenoid valve V4) between the said liquid tank for extraction and the said filter unit.

  The invention of the present application can be downsized and cost can be reduced by not using an air pump as in the conventional example.

  In addition, the liquid for extraction (which may be any liquid, but mainly hot water) is pressurized instead of the liquid mixture, and the astringency of coffee can be reduced as compared with the case where the liquid mixture is pressurized.

  In addition, since pressurized steam with a constant pressure can be supplied, it is possible to obtain a coffee having a substantially uniform taste without any coffee taste.

  Further, for example, since the pressurized steam pressure and the pressurized steam amount can be adjusted by changing the opening timing and the opening time of the electromagnetic valve, coffee of various tastes with different strengths can be obtained.

  Further, by providing the liquid tank, it is possible to save the trouble of supplying water individually to the steam generation tank and the extraction liquid tank which are the steam generation devices.

Whole schematic sectional view of the coffee maker of the present invention Control block diagram of the coffee maker of the present invention Exploded perspective view of the filter unit of the present invention Cross sectional view of the filter unit of the present invention Time chart of each member of the present invention Cross section of a conventional air pressurized coffee maker

  1 is an overall schematic sectional view of a coffee maker, FIG. 2 is a control block diagram of the coffee maker, FIGS. 3 and 4 are exploded and assembled views of the filter unit, and FIG. 5 is a time chart of each member. Indicates.

  The coffee maker 20 has a rectangular cylindrical shape in plan view and has a metal main body case 21 as an outer shell, and a liquid tank 30, a steam generation tank 35, an extraction liquid tank 40, a server 45, a drain tank 50, The filter unit 60 and the control device 100 are included.

  The interior of the main body case 21 is partitioned into an upper chamber 24, a lower chamber 25, and a bottom chamber 26 by a horizontal upper partition member 22 and a lower partition member 23. The upper chamber 24 includes a liquid tank 30 and The extraction liquid tank 40 and the control device 100 are arranged, the vapor generating tank 35, the server 45, and the filter unit 60 are arranged in the lower chamber 25, and the drainage tank 50 is arranged in the bottom chamber 26. Is placed.

  In addition, the coffee maker 20 of this application can be used for both business use and home use. In the following description, it is assumed that water is used as the liquid and coffee for about 4 people can be extracted, but other types may be used.

  The liquid tank 30 is a resin-made and cylindrical tank into which extraction water is put in advance, and can contain about 600 cc of water. The liquid tank 30 may be omitted, but in that case, it is necessary to add water to each of the steam generation tank 35 and the extraction liquid tank 40 in advance. However, providing the liquid tank 30 can eliminate such trouble.

  The steam generating tank 35 is a stainless steel and cylindrical tank for generating steam corresponding to the steam generating device. For example, the steam generating tank 35 has a capacity of 1000 cc, a steam heater 36 is placed inside, a pressure sensor 37 and A safety valve 38 is arranged.

  The steam heater 36 is, for example, a disk-shaped sheathed heater corresponding to the steam generating means, and has a capacity of, for example, 1000 W, and the pressure sensor 37 is a known one that detects the steam pressure corresponding to the steam detecting means, For example, when 0.2 MPa is detected, the signal is sent to the control device 100, and the control device 100 opens a third electromagnetic valve V3 and the like which will be described later.

  The safety valve 38 opens when the vapor pressure of the vapor generating tank 35 becomes abnormally high and releases the abnormal vapor pressure to the atmosphere. For example, the safety valve 38 is set to open when the pressure reaches 0.3 MPa (about 3 atmospheric pressure). Has been.

  The provision of the safety valve 38 reduces the risk of the steam generating tank 35 exploding when the pressure sensor 37, the third electromagnetic valve V3, or the like fails.

  Then, for example, about 100 cc of water is introduced into the vapor generating tank 35 from the liquid tank 30, vaporized by the vapor heater 36, and sent to the extraction liquid tank 40 when a predetermined vapor pressure is reached.

  The extraction liquid tank 40 is a substantially cylindrical tank made of stainless steel for converting water into hot water, a hot water heater 41 corresponding to a heating means is attached to the outer periphery thereof, and a temperature sensor 42 is provided inside. . The extraction liquid tank 40 corresponds to the extraction device of the present application together with the filter unit 60.

  The hot water heater 41 is a flat-plate sheathed heater having a power lower than that of the steam heater 36, for example, 400 W, and heats water to make hot water corresponding to the heating liquid of the present application.

  The temperature sensor 42 is a known sensor that detects the temperature of hot water. For example, when 80 ° C. is detected, the temperature sensor 42 sends a signal to the control device 100, and the control device 100 opens a fourth solenoid valve V4 described later. Hot water is sent to the filter unit 60. The temperature of hot water can be freely set according to the type and preference of coffee beans.

  The server 45 stores the extracted coffee and can be taken out in the horizontal direction with respect to the main body case 21 and is set below the filter unit 60 at the time of extraction.

  The drain tank 50 is a resin tank disposed in the bottom chamber 26 and discards the hot water remaining in the steam generating tank 35 after coffee extraction. Will be set again.

  The drain tank 50 communicates with the bottom of the steam generating tank 35 via the water distribution pipe 51, and the fifth electromagnetic valve V <b> 5 is interposed in the water distribution pipe 51. The fifth electromagnetic valve V5 is of an open / close type, and is opened by the control device 100 after the extraction is completed, and sends the remaining hot water in the steam generation tank 35 to the drainage tank 50.

  The filter unit 60 is a kind of container unit for storing coffee powder, and includes a container-like member for storing coffee powder and a filter. An example will be described, but other than this example, for example, a ceramic container used for household use, which is composed of a container member having a V-shaped longitudinal section and a large number of holes, and a filter inserted therein. It may be.

  As shown in FIGS. 3 and 4, the filter unit 60 includes a main body member 61 and a cap member 62. The main body member 61 is an open and metal cylindrical member having an integral cylindrical cylindrical body 61a standing upward on an upper wall portion thereof, and a female screw 61b is provided on the inner periphery of the cylindrical body 61a. The main body member 61 has a male screw 61 c on the outer periphery in the vicinity of the lower end thereof.

  The cap member 62 is an upwardly open metal cylindrical member having an integrally cylindrical extraction pipe 62a that hangs downward on the lower wall portion thereof, and has an internal thread 62b on the inner periphery of the cap member 62.

  The female screw 61 b of the cylindrical body 61 a of the main body member 61 is screwed to a male screw (not shown) formed on the outer periphery in the vicinity of the lower end portion of the third pipe 44 described later, and the filter unit 60 is attached to the third pipe 44. Become. The attachment may be such that an O-ring is attached to the outer periphery of the third conduit 44 and the inner periphery of the cylinder 61a of the main body member 61 is press-fitted into the O-ring.

  In any case, by adopting the above attachment configuration, the filter unit 60 can be easily attached to the third conduit 44, and the subsequent cleaning of the filter unit 60 and the replacement of the coffee powder are facilitated.

  In addition, a female screw 62 b on the inner periphery of the cap member 62 is screwed onto the male screw 61 c in the vicinity of the lower end of the main body member 61, so that the cap member 62 is fixed to the main body member 61.

  Between the main body member 61 and the cap member 62, an O-ring 63, a filter member 64, coffee powder 65, a filter member 64, an O-ring 63, and a spacer 66 are sequentially arranged from the upper side to the lower side.

  The two O-rings 63 and 63 are the same, and seal so that hot water and coffee do not leak from the outer peripheries of the filter members 64 and 64, respectively. Is.

  The two filter members 64, 64 are the same and are metal disk-like flat plates having a plurality of pores, and a necessary amount between them, for example, coffee for one person or a plurality of persons. Powder 65 is placed.

  The spacer 66 is a cylindrical resin member. When the cap member 62 is screwed to the main body member 61, the lower filter member 64 is pushed upward together with the lower O-ring 63, and the two filter members 64. , 64 is compressed in a predetermined amount.

  If there is an air space between the coffee powders, hot water will not pass evenly, making it difficult to properly extract the coffee powder from the whole coffee powder. The filter unit 60 of the present application can reduce such adverse effects, and a plurality of spacers 66 having different heights corresponding to the number of coffee powders for the number of people are prepared in advance, and suitable for the number of people at the time of use. In the case of one person, for example, one person having a high height is used, and in the case of a plurality of persons, one having a lower height is used as the number of persons increases. A spring material (for example, a coil spring or a leaf spring) may be used instead of the spacer. In that case, a plurality of spring materials having a spring force suitable for the number of persons are prepared.

  In any case, the force for compressing the coffee powder is the same in any spacer 66, so that hot water flows evenly in the entire coffee powder. As a result, even if the amount of the coffee powder changes, proper extraction from the whole coffee powder can be performed, so that a coffee with a strong taste can be extracted.

  As shown in FIG. 2, the control device 100 receives signals from the pressure sensor 37, the temperature sensor 42, and the flow meter 33, and receives the steam heater 36, the hot water heater 41, the pump P, the first electromagnetic valve V1 through the fifth electromagnetic valve. The valve V5 is controlled, and is provided in the vicinity of the liquid tank 30, for example.

  Since the vicinity of the liquid tank 30 is close to the atmospheric temperature, the thermal adverse effect on the control device 100 can be reduced. In addition, the control apparatus 100 may be provided in the outer wall part of the bottom part chamber 26 or the main body case 21 with low temperature, and can similarly reduce a thermal bad influence.

  The route and the like will be described. The liquid tank 30 and the vapor generating tank 35 communicate with each other through a first pipeline 31 corresponding to a path, and a flow meter 33, a pump P, and a first electromagnetic valve V1 are disposed in the first pipeline 31. . And water flows in the direction of the black arrow.

  The flow meter 33 is, for example, a known one that measures the flow rate of water by rotating a wing, and the signal is sent to the control device 100. For example, when 100 cc of water in the liquid tank 30 is detected, the signal is sent to the control device 100, and the control device 100 closes the first electromagnetic valve V1. Note that the second to fifth solenoid valves V2 to V5 remain closed during that time.

  The pump P is a known pump that sends the water in the liquid tank 30 to the vapor generation tank 35 or the extraction liquid tank 40. For example, a diaphragm type pump is used.

  The first electromagnetic valve V1 is a normally closed on-off valve whose opening / closing timing and opening / closing time are controlled by the control device 100 and send a predetermined amount of water to the steam generating tank 35 at a predetermined time. In this case, as described above, the opening / closing control is performed so that, for example, 100 cc of water in the liquid tank 30 is sent to the steam generation tank 35.

  In addition, one end of a second pipe 32 that also corresponds to the path communicates with the first pipe 31 between the pump P and the first electromagnetic valve V1, and the other end of the second pipe 32 is extracted. The second electromagnetic valve V <b> 2 is disposed in the second pipe line 32 in communication with the upper surface that is also the upper part of the liquid tank 40. When the first solenoid valve V1 is closed and the second solenoid valve V2 is opened, water flows in the direction of the black arrow.

  The second electromagnetic valve V2 is a normally closed on-off valve whose opening / closing timing and opening / closing time are controlled by the control device 100 and send a predetermined amount of water to the extraction liquid tank 40 at a predetermined time. In this case, for example, the opening / closing control is performed so that the remaining 500 cc of water in the liquid tank 30 is sent to the extraction liquid tank 40.

  By providing the liquid tank 30 and the flow meter 33, a predetermined amount of water can be automatically distributed to the steam generation tank 35 and the extraction liquid tank 40. It will be possible to save time and effort.

  The upper surface, which is the upper part of the steam generation tank 35, and the upper surface, which is the upper part of the extraction liquid tank 40, communicate with each other through the steam line 43, and the third solenoid valve V3 is disposed in the steam line 43. The The steam then flows in the direction of the white arrow.

  The third electromagnetic valve V3 is a normally closed on / off valve whose opening / closing timing and opening / closing time are controlled by the control device 100 to open / close so as to send a predetermined amount of steam above the extraction liquid tank 40 at a predetermined time. Be controlled.

  A third pipe 44 hangs below the extraction liquid tank 40. In the third conduit 44, the fourth electromagnetic valve V4 and the filter unit 60 described above are interposed from above, and the tip of the extraction pipe 62a that hangs down below the filter unit 60 faces the server 45, The extracted coffee is poured into the server 45.

  The fourth solenoid valve V4 is a normally-closed on-off valve whose opening / closing timing and opening / closing time are controlled by the control device 100 and controlled to send a predetermined amount of hot water to the filter unit 60 at a predetermined time.

  The fifth solenoid valve V5 is a normally closed on-off valve that is opened after the extraction is completed and sends the remaining hot water in the steam generating tank 35 to the drainage tank 50.

  The operation will be described based on the time chart of FIG. First, when 600 cc of water is put in the liquid tank 30 in advance and a start switch (not shown) is pushed, the pump P is driven (ON) by the control device 100, and the first electromagnetic valve V1 is opened.

  Then, the water in the liquid tank 30 flows through the first conduit 31 to the steam generation tank 35. The amount of flowing water is measured by the flow meter 33. When 100 cc is detected, the first electromagnetic valve V1 is closed and the second electromagnetic valve V2 is opened. The first solenoid valve V1 remains closed thereafter.

  Then, all of the remaining water in the liquid tank 30, for example, 500 cc flows through the second pipe 32 to the extraction liquid tank 40. Whether or not the remaining amount has flowed is determined based on whether or not the flow meter 33 has detected emptyness.

  That is, when the flow meter 33 detects empty, the pump P is stopped (turned off) and the second electromagnetic valve V2 is closed. Thereafter, the pump P remains stopped, and the second solenoid valve V2 remains closed. The reason for closing the second solenoid valve V2 is to prevent the vapor sent into the extraction liquid tank 40 from flowing out, that is, the vapor sent into the extraction liquid tank 40 passes through the second conduit 32. This is to prevent the liquid tank 30 from flowing out.

  Then, when the flow meter 33 detects empty, the steam heater 36 and the hot water heater 41 are turned on to heat the water in the steam generation tank 35 and the extraction liquid tank 40. In this case, the steam heater 36 is 1000 W, for example, and the hot water heater 41 is 400 W. Since the output of the steam heater 36 is larger, the water in the steam generating tank 35 quickly becomes steam, and the steam pressure is measured by the pressure sensor. 37 is detected.

  Further, the water in the extraction liquid tank 40 becomes hot water, and its temperature is detected by the temperature sensor 42. As will be described later, when the hot water in the extraction liquid tank 40 reaches 80 ° C. during the extraction, steam is introduced from the vapor generation tank 35 into the extraction liquid tank 40, so that the extraction liquid tank 40 is warmed. The internal temperature does not drop.

  The steam heater 36 is kept on until the steam pressure in the steam generating tank 35 reaches a predetermined value, for example, 0.2 MPa, but the temperature of the hot water in the extraction liquid tank 40 is set to a predetermined value, for example, 80 When the temperature is lower than 0 ° C., the on / off operation is repeated so that the vapor pressure is turned off when the vapor pressure in the vapor generation tank 35 becomes 0.2 MPa, and then turned on again when the vapor pressure falls below 0.2 MPa.

  Thereafter, when the temperature of the hot water in the extraction liquid tank 40 reaches a predetermined value, for example, 80 ° C., the steam heater 36 is maintained in an ON state, and a steaming process described later is immediately performed. And if 0.2 MPa is detected after completion | finish of this steaming process, the steam heater 36 will be turned off and the state will be maintained.

  The hot water heater 41 is turned on after the pump P is stopped and is maintained as it is. When the temperature of the hot water reaches 80 ° C., the hot water heater 41 is turned off and is maintained as it is. Note that the time from the hot water heater 41 being turned off to the extraction process is short, and the temperature of the hot water is maintained at a predetermined temperature of 80 ° C. due to the action of steam.

  When the temperature of the hot water reaches 80 ° C., the steaming process is performed immediately. The steaming process is a process of inflating the coffee powder. First, a small amount of hot water is applied to the coffee powder, and the coffee powder is thoroughly steamed while maintaining the state for a while, so that the subsequent coffee extraction is necessary and sufficient. .

  In the steaming step, when the temperature of the hot water in the extraction liquid tank 40 reaches 80 ° C., the fourth electromagnetic valve V4 is opened for 10 seconds, for example, to supply about 20 cc of hot water, and then closed and maintained for about 20 seconds, for example. Is done. These times may be varied according to the amount of coffee powder.

  When the steam pressure is detected to be 0.2 MPa after the steaming step, the third solenoid valve V3 and the fourth solenoid valve V4 are opened, and the steam heater 36 is turned off.

  As a result, the steam in the steam generation tank 35 is introduced into the extraction liquid tank 40 from above the extraction liquid tank 40 via the steam line 43, and the introduced steam is hot water in the extraction liquid tank 40. Press down from above. Then, the hot water in the extraction liquid tank 40 is pushed out to the filter unit 60 via the third conduit 44.

  The extruded hot water uniformly extracts coffee from the coffee powder in the filter unit 60, and the extracted coffee with a strong taste flows out from the pouring pipe 62a to the server 45 and is stored in the server 45.

  The opening timing and opening time of the third solenoid valve V3 and the fourth solenoid valve V4 can be freely set, and are adjusted according to the type and amount of coffee, that is, supplied. By adjusting the pressure and amount of the steam so as to be suitable for coffee, it becomes possible to always extract coffee having the optimum taste.

  In other words, coffee taste is better when the hot water temperature is higher, and the hot water temperature is lower as the hot water temperature is lower. However, the medium for determining the extraction speed is steam and an electromagnetic valve is interposed. Therefore, the adjustment can be easily performed.

  In addition, although demonstrated as what has a steaming process, the steaming process does not need to be. In that case, when the steam reaches a predetermined pressure and the hot water reaches a predetermined temperature, the third electromagnetic valve V3 and the fourth electromagnetic valve V4 are opened and hot water is supplied to the filter unit 60 at once to extract coffee. Will do. Moreover, although demonstrated as what uses coffee powder as a material which should be extracted, you may use black tea, green tea, etc.

  The present invention is not limited to the configuration of the above-described embodiment, and can be appropriately changed in design without departing from the gist of the invention.

DESCRIPTION OF SYMBOLS 20 Coffee maker 21 Main body case 22 Upper partition member 23 Lower partition member 24 Upper chamber 25 Lower chamber 26 Bottom chamber 30 Liquid tank P Pump 31 1st pipe line 32 2nd pipe line 33 Flowmeter 35 Steam generation tank 36 Steam heater 37 Pressure sensor 38 Safety valve 40 Extraction liquid tank 41 Hot water heater 42 Temperature sensor 43 Steam pipe 44 Third pipe 45 Server 50 Drain tank 51 Water distribution pipe 60 Filter unit 61 Main body member 61a Tubing body 61b Female screw 61c Male screw 62 Cap member 62a Note Outlet pipe 62b Female thread 63 O-ring 64 Filter member 65 Coffee powder 66 Spacer V1 1st solenoid valve V2 2nd solenoid valve V3 3rd solenoid valve V4 4th solenoid valve V5 5th solenoid valve 100 Control device

Claims (3)

A coffee maker having a steam generator and an extraction device,
The steam generator has steam generating means and steam detecting means,
The extraction device communicates with the steam generator via a path having a solenoid valve;
The electromagnetic valve is controlled to open and close based on a signal from the steam detection means,
The coffee maker characterized in that, during coffee extraction, the liquid in the extraction device is pushed from above by the steam generated by the steam generation device. A coffee maker having a steam generator and an extraction device,
The steam generator has steam generating means and steam detecting means,
The extraction device has an extraction liquid tank having a heating means, a filter unit, and communicates with the steam generation device via a path having an electromagnetic valve.
The solenoid valve is controlled to open and close based on the signal of the steam detection means,
The coffee maker characterized in that, during coffee extraction, the heated liquid in the extraction liquid tank is pushed from above by the steam generated by the steam generator and reaches the filter unit.   The coffee maker according to claim 2, further comprising another electromagnetic valve between the extraction liquid tank and the filter unit.

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