electric coffee maker

Abstract

Electric coffee makers equipped with a drip flow path and a hot water refill flow path allow users to select the drip rate and brew the desired amount of coffee by adjusting the amount of drip and hot water refills, but due to problems with the boiler volume, heater size, and the amount of water required for one cup, they were unable to brew enough coffee for four people. This invention solves this problem. [Solution] This drip-type electric coffee maker first selects the drip rate, brews one cup of coffee depending on the amount of drip and the amount of hot water added, then supplies additional water to the boiler at 50-100% of the amount of one cup of coffee, boils the water, and adds additional hot water to use up the water that was supplied, making it possible to brew enough coffee for four people.

Description

[Technical Field]

[0001] Conventionally, electric drip coffee makers have a flow path for the drip process and a flow path for the hot water addition process, and by controlling the amount of drip and hot water addition using an electromagnetic valve, they can remove impurities from drip coffee and brew delicious coffee to suit the user's preferences, but they have had the problem of not being able to brew more coffee than one large cup (equivalent to two small cups). The reason why it is not possible to make more coffee than the amount of coffee in one large cup is due to issues related to the boiler volume, heater size, and the amount of water needed for one cup. Details are explained in

[0051] and

[0052] of [Example]. [Background technology]

[0002] [Figure 3] and [Figure 4] are diagrams showing how to brew a small cup of coffee (one serving) totaling approximately 125 mL using a commercially available paper filter dripper, dripping the first 1 / 3, the next 1 / 3, and the final 1 / 3 of approximately 10-12 g of ground coffee.

[0003] The first third and second third of the coffee are fragrant and delicious. However, the last third is pale in color, like black tea, and has a strong, unpleasant taste. Conventionally, electric drip coffee makers have been able to brew one large cup of coffee (two small cups) by adjusting the amount of drip and adding water to avoid dripping the unpleasant part (impurities) in the latter half of the drip. Summary of the Invention [Problem to be solved by the invention]

[0004] A drip coffee maker that removes the impurities of conventional drip coffee can supply and maintain the amount of water needed to boil one cup of coffee by controlling the operating time of the electric pump to brew one cup of coffee.One cup of coffee can be brewed by using some of the water for the steaming process, some for the drip process, and the remaining water for the topping up process.

[0005] A drip flow path that supplies hot water to the dripper and a hot water addition flow path that supplies hot water directly to the coffee cup are provided, and solenoid valves are placed on each flow path. Opening and closing By controlling the time, the steaming process, drip process, and hot water addition process are carried out to complete the entire process of brewing one cup of coffee. When all processes are completed, all the water supplied to the boiler is used up so that no water remains in the boiler.

[0006] In the drip process, the drip rate for one cup of coffee is set to 30-70%, and when the drip volume reaches 30-70% of the volume of one cup of coffee, solenoid valve A is closed and the drip process is completed. One cup of coffee can be brewed depending on the amount of drip that has had impurities removed and the amount of hot water added in the hot water addition process.

[0007] The boiler has a capacity to hold one cup of water, a heater is placed inside the boiler, there is a water supply hole and two hot water supply holes, and there is also an exhaust hole to prevent pressure or negative pressure from building up inside the boiler.

[0008] The conventional drip-type electric coffee maker, which can remove impurities, was an invention for brewing a single cup of coffee. Single-serving coffee cups range from small to large (mug) sizes, and one cup contains approximately 125 mL to 250 mL of coffee. The amount of ground coffee needed to make one cup of coffee was approximately 10 g to 20 g.

[0009] Thus, conventional drip-type electric coffee makers equipped with a drip channel and a hot water refill channel, which can remove impurities from drip coffee, could brew approximately 250 mL of coffee, which is the equivalent of two large cups (two small cups), but could not brew larger amounts of coffee. For example, they could not brew two large cups (four small cups, or approximately 500 mL).

[0010] There are two types of paper filters available on the market: small and large filters (see Figure 11). The small filter can hold up to 30g of ground coffee, while the large filter can hold more than 30g of ground coffee.

[0011] However, in order to use a large filter to brew more coffee than a large cup (the equivalent of two small cups), the boiler volume must be increased. However, holding and boiling the equivalent of two large cups of water (approximately 500 mL) in the boiler would result in the coffee maker becoming larger, and there was also the problem of the relationship between the boiler volume, heater size (shape), and the amount of water required for one cup. Therefore, it was not possible to brew approximately 500 mL of coffee. For the reasons for this, see

[0051] and

[0052] . [Means for solving the problem]

[0012] The present invention solves the above-mentioned problems. It is an electric drip coffee maker that has an electric pump placed between the water tank and the boiler, a boiler, dripper, and coffee cup or coffee server arranged vertically from top to bottom to allow hot water to easily fall naturally, solenoid valve A is placed between the boiler and the dripper to form a flow path for the drip process, and solenoid valve B is placed between the boiler and the coffee cup or coffee server to form a flow path for the hot water addition process.

[0013] The amount of water for one small or large cup can be supplied to the boiler by controlling the operating time of the electric pump, and the boiled water is maintained. To perform the steaming process, the solenoid valve A in the flow path for the drip process is controlled to open and close, and the amount of water required for steaming is supplied to the dripper, and solenoid valve A is closed to perform the steaming process.

[0014] When the steaming process is completed, the drip process begins, and the solenoid valve A is again controlled to open and close to supply hot water to the dripper and extract coffee into a coffee cup or coffee server. To solve the conventional problem, the drip rate can be set to 30 to 100% in the present invention.

[0015] When the drip rate reaches 30-100% of the amount of coffee required for one small or large cup, solenoid valve A is closed, completing the drip process. Next, the hot water refill process is performed by controlling the opening and closing of solenoid valve B in the flow path for the hot water refill process, supplying hot water directly to a coffee cup or coffee server to brew one cup of coffee. When the hot water refill process is completed, all the water supplied to the boiler is used up so that no water remains in the boiler. When the drip rate is 100%, there is no hot water refill process, so all the water supplied is used up in the drip process.

[0016] Alternatively, the steaming process can be included in the drip process, and the steaming and drip processes can be performed by controlling the opening and closing of solenoid valve A. The hot water addition process can be performed by controlling the opening and closing of solenoid valve B, which supplies hot water directly to a coffee cup or coffee server to brew one cup of coffee. Drip coffee makers that can remove these impurities from drip coffee cannot brew more than the amount of coffee that makes up a large cup (approximately 250 mL). For the reasons for this, see

[0051] and

[0052] .

[0017] Therefore, in order to solve the conventional problem and brew more coffee than one large cup, first, as described above in

[0013] to

[0015] , water is supplied to the boiler, the water is boiled, the steaming process, the drip process, and the hot water is added, and the coffee amount of one large cup is brewed in the coffee server.

[0018] Next, add 50-100% of the amount of water needed for one large cup of coffee to the boiler and keep it there until the water is boiled to 90-100°C. Opening and closing The water is supplied directly to the coffee server by controlling the temperature, and the additional water is used up completely so that there is no water left over.

[0019] Therefore, the amount of coffee in the coffee dispenser is the sum of the amount of coffee in one cup brewed with

[0017] and

[0018] and the amount of additional hot water added. In this way, the impurities in the drip are removed, and it is possible to brew more coffee than the amount of coffee in one large cup.

[0020] In this way, the operation timing and duration of the electric pump, solenoid valves A and B, and the ON / OFF of the heater are controlled, and after supplying water to the boiler, boiling water, and carrying out the steaming process, drip process, and hot water addition process to brew one cup of coffee, the electric drip coffee maker is equipped with a control circuit that supplies additional water to the boiler, boils water, and adds additional hot water. [Effects of the Invention]

[0021] The drip-type electric coffee maker of the present invention has a boiler, a dripper, and a coffee cup or coffee server arranged vertically from top to bottom, and has a flow path for supplying hot water to the dripper and a flow path for supplying hot water directly to the coffee cup, and an electromagnetic valve installed in each flow path. Open and close By controlling this, the hot water falls naturally, and the steaming, dripping and topping up processes are carried out, allowing one cup of coffee to be brewed.

[0022] This is an invention of a drip-type electric coffee maker that, after brewing one cup of coffee, supplies additional water to the boiler to boil the water, and adds more hot water, allowing it to brew more coffee than one large cup (two small cups). DETAILED DESCRIPTION OF THE INVENTION [Example]

[0023] The meanings of the terms used here are explained below. The amount of coffee in one cup is the amount of coffee you want to brew for one person, regardless of the size of the coffee cup. amount The amount of water for one cup is the amount of water required to brew one cup of coffee regardless of the size of the coffee cup 7, and is the sum of the amount of coffee in one cup and the amount of water absorbed by the coffee grounds 11.

[0024] Drip refers to supplying hot water to coffee grounds 11 to extract coffee. The drip amount refers to the amount of coffee dripped into the coffee cup 7 or coffee server 43. Adding hot water refers to supplying hot water directly from the boiler 12 to the coffee cup 7 or coffee server 43, and the amount of added hot water refers to the amount of hot water added. The drip rate refers to the ratio of the amount of drip to the amount of coffee in one cup.

[0025] The steaming process is a process in which hot water is supplied to the coffee grounds 11 before the drip process to allow them to fully absorb water and steam. The drip process is a process in which hot water is supplied to the coffee grounds 11 in the dripper 9 to extract coffee, and the steaming process is also part of the drip process. The hot water addition process is a process in which boiled water is supplied directly to the coffee cup 7 or the coffee server 43.

[0026] As shown in Figure 10, coffee cups 7 come in small cups 45 and large cups 46. Large cup 46 can hold approximately twice the amount of coffee as the small cup. Coffee server 43 can hold the amount of coffee equivalent to four small cups 45. While there are no limitations on the capacity of the small cups, large cups, and coffee server, the capacity of a small cup is typically assumed to be 120 to 140 mL of coffee. The capacity of a large cup is assumed to be approximately twice that amount.

[0027] As shown in Figure 11, there are two common types of paper filters 10: a small filter 47 and a large filter 48. The small filter 47 is a paper filter 10 for one to two small cups and can hold approximately 10 to 30 grams of ground coffee. The large filter 48 can hold more than 30 grams of ground coffee. The amount of ground coffee used is not limited as it is up to the user's preference, but a small cup 45 typically requires 10 to 15 grams of coffee.

[0028] [Figure 2] shows the operation panel 2, and the selection switch A4 allows you to select American (coffee) 40% drip, mild (coffee) 70% drip, or regular (coffee) 100% drip. Strong (coffee) is coffee that does not require additional hot water.

[0029] The configuration of the device 1, which is an embodiment of the present invention, will be described below. [Fig. 1] shows an example of the exterior view of an electric coffee maker of the present invention. An operation panel 2 is equipped with a power switch 3, a selection switch A4, and a start switch 5. The selection switch A4 allows the user to select the drip rate for one cup of coffee, either a small or large cup.

[0030] Furthermore, the selection switch B40 can select the amount of coffee for one cup in a small cup 45 or a large cup 46. The 4-cup switch 41 is a switch for selecting the amount of coffee for four small cups 45 using the coffee server 43.

[0031] A removable water tank 6 is located at the rear of the device, and a coffee cup 7 for receiving coffee or a coffee server 43 can be placed at the front bottom. The dripper holder 8 is removable, and can be removed to set a dripper 9. The dripper 9 can be fitted with a small filter 47 or large filter 48 of a paper filter 10 and coffee powder 11 can be added.

[0032] [Figure 5] shows an example of the configuration of an electric coffee maker of the present invention, illustrating the basic components arranged to achieve the effects of the present invention. Water tank 6 and boiler 12 are connected by water supply pipe 14 via electric pump 13. Electric pump 13 can supply water to boiler 12 by controlling its operating time. Boiler 12, dripper 9, and coffee cup 7 or coffee server 43 are arranged vertically from top to bottom to allow hot water to fall naturally.

[0033] [Figures 6] and [Figure 7] show the components of the boiler 12. The boiler 12 is composed of a boiler vessel 17, a vessel lid 18, and a heater 19, with the heater 19 being disposed in the hollow of the boiler 12. The boiler 12 also has a temperature sensor 20, a thermostat 21, and a thermal fuse 22. Furthermore, a water supply hole 23 and an exhaust hole 24 are provided in the vessel lid 18 at the top of the boiler 12, and hot water supply holes A 25 and B 26 are provided in the bottom of the boiler vessel 17.

[0034] The purpose of the exhaust hole 24 is to exhaust air so that no internal pressure is generated in the boiler 12 when supplying water, making it possible to easily supply one cup of water, and to draw air in so that negative pressure does not form in the boiler 12 when supplying hot water to the dripper 9 and coffee cup 7 or coffee server 43.

[0035] Furthermore, the exhaust hole 24 is connected by an exhaust pipe 31 to an exhaust port 30 provided on the outer casing of the body 1 in order to exhaust the steam generated by boiling water outside the body, thereby preventing steam and water droplets from adversely affecting the components inside the body.

[0036] Solenoid valve A15 is placed between boiler 12 and dripper 9, and they are connected by hot water supply pipe A32 to form a flow path for the drip process. Also, solenoid valve B16 is placed between boiler 12 and coffee cup 7 or coffee server 43, and they are connected by hot water supply pipe B33 to form a flow path for the hot water addition process. By controlling the operation timing and operation time of solenoid valves A15 and B16, hot water can be supplied to dripper 9 for steaming and coffee drip, and hot water alone can be supplied directly to coffee cup 7 or coffee server 43 for adding hot water.

[0037] First, an example of the process for brewing one cup of coffee will be described. When brewing one cup of coffee, power switch 3 is pressed to turn on the power, selection switch A4 is pressed to select the desired coffee, and then selection switch B40 is used to select a small or large cup. When start switch 5 is pressed, the operating time of electric pump 13 is controlled to supply water for one cup to boiler 12. The amount of water for one cup can also be supplied in multiple batches.

[0038] The amount of water supplied to the boiler 12 is maintained, the heater 19 is turned on, and the water boiling process begins. When the water temperature in the boiler 12 reaches 90-100°C, the temperature sensor 20 detects this and turns off the heater 19. Until this process, the solenoid valves A15 and B16 are in the "closed" state.

[0039] Next, the steaming process begins, and solenoid valve A15 is controlled to open and close, supplying the amount of hot water required for steaming to dripper 9. The amount of hot water used for steaming is approximately 20 to 50 mL, which is sufficient to steam coffee grounds 11 in dripper 9. Solenoid valve A15 then closes, and coffee grounds 11 in dripper 9 are steamed for approximately 20 to 30 seconds.

[0040] After the steaming process, the drip process begins, and solenoid valve A15 Opening and closingTime is controlled to supply hot water to the dripper 9 and extract the coffee into the coffee cup 7 or coffee server 43. When mild (70% drip) is selected with the selector switch A4 in [Fig. 2] and the large cup 45 is selected with the selector switch B40, the solenoid valve A15 closes and the drip process is completed when the drip rate reaches 70%. At this time, the drip volume is approximately 175 mL, as shown in [Fig. 8].

[0041] After the drip process, the water is added and the solenoid valve B16 Opening and closing The time is controlled and hot water is supplied directly to the coffee cup 7 or the coffee server 43. At this time, the amount of hot water added is approximately 75 mL, as shown in Figure 8. The amount of coffee in one cup is approximately 250 mL, consisting of 175 mL of drip coffee and 75 mL of added hot water.

[0042] When completing the above-mentioned hot water addition process, the solenoid valve B16 is "open" until the hot water in the boiler 12 runs out, and when the hot water in the boiler 12 runs out, the solenoid valve B16 is closed and the coffee brewing process is completed.

[0043] The present invention will now be described. A method for brewing four small cups 45 worth of coffee using a coffee server 43 will be explained. First, with reference to Figures 8 and 9, the amount of coffee and ground coffee required when brewing coffee using a small cup 45, a large cup 46, and a coffee server 43 will be explained. When the amount of coffee in a small cup 45 is 125 mL, the amount of ground coffee is approximately 10 g. When the amount of coffee in a large cup 46 is 250 mL, the amount of ground coffee is approximately 20 g. The small filter 47 can accommodate up to approximately 30 g of ground coffee, so the amount of ground coffee can be increased or decreased according to preference. When brewing four small cups 45 worth of coffee (two large cups), approximately 40 g of ground coffee is added to the large filter 48.

[0044] As described in

[0051] and

[0052] , the capacity of the boiler 12 is limited, and it is not possible to brew more coffee than the approximately 250 mL of coffee that is equivalent to one cup of coffee in the large cup 46. However, the capacity of the large cup 46 is not limited, so the approximately 250 mL of coffee that is equivalent to one cup can be increased or decreased slightly depending on preference.

[0045] Despite the limitations of the boiler volume, the design of the program that controls the water supply, boiling water, and hot water supply of this invention makes it possible to brew the amount of coffee equivalent to four small cups. This invention solves the problem that, in the past, it was not possible to brew more than four small cups of coffee.

[0046] An example of the process for brewing four small cups of coffee according to the present invention is described below. When brewing four small cups of coffee, approximately 40g of coffee powder is placed in the large filter 48 and the coffee server 43 is used. Power switch 3 is pressed to turn on the power, select regular (100% drip) on selector switch A4, select the "4 cups" switch 41 on selector switch B40, and when start switch 5 is pressed, the operating time of electric pump 13 is controlled to supply water equivalent to one large cup to boiler 12. Here, 100% drip is selected as an example, but 70% drip can also be selected.

[0047] After supplying the boiler 12 with water equivalent to one cup of large cup 46, approximately 250 mL of coffee is extracted into the coffee server 43 through the steps described above in

[0037] to

[0042] . Since 100% drip is selected here, there is no step of adding hot water. At this time, as explained in [Figure 9], approximately 40 g of ground coffee can brew 500 mL of coffee, so the drip volume of approximately 250 mL is the extraction volume (drip volume) with a drip rate of 50%.

[0048] Next, the operating time of the electric pump 13 is controlled to supply 50 to 100% of the amount of water (about 250 mL in this case) for one cup of coffee in the large cup 46 to the boiler 12 again to boil the water, and when the water temperature reaches 90 to 100°C, the heater 19 is turned off. Opening and closing The solenoid valve B16 is controlled to supply additional hot water directly to the coffee server 43. At this time, the solenoid valve B16 is kept "open" until the hot water in the boiler 12 runs out, so that no water remaining in the boiler 12 is left.

[0049] By extracting approximately 250 mL of coffee into the coffee server 43 through step

[0047] above, and then adding approximately 250 mL of hot water through step

[0048] , you can brew 500 mL of coffee with a drip rate of 50%, as shown in [Fig. 9]. If you want to brew a stronger coffee, you can increase the amount of ground coffee by approximately 40 g. Furthermore, if you increase the amount of ground coffee to 30 g, you can brew a weaker coffee, as shown in [Fig. 9].

[0050] In this way, the coffee brewing process is controlled by the program of the control circuit 36, which controls the operation timing and operation time of the electric pump 13, the solenoid valve A15, the solenoid valve B16, and the heater 19, thereby removing impurities and making a drip-type electric coffee maker that can brew an amount of coffee ranging from one small cup to more than one large cup 46.

[0051] Referring to Figure 6, the constraints on boiler volume will be explained. While it is conceivable to increase the volume of boiler 12 to brew coffee amounts of more than approximately 250 mL, this is not possible due to the following problems. First, it would be impossible to brew the amount of coffee needed for a small cup 45. Increasing the volume of boiler 12 and increasing the amount of water supplied would require increasing the wattage of heater 19, otherwise it would take too long to boil water and would not be usable as a product. If the inner diameter of boiler 12 is increased to increase the boiler volume, the water depth would be shallow with the amount of water supplied to brew the amount of coffee needed for a small cup 45, and the heat-generating part 44 of heater 19 would not be submerged.

[0052] On the other hand, when the height of the boiler 12 is increased, the winding height of the heater 19 also increases, so when brewing a small cup 45 of coffee, the heating element 44 of the heater 19 is not submerged. If the heating element 44 of the heater 19 is not submerged, the heater will overheat, causing the temperature inside the device to rise, which will reduce the efficiency of boiling water. This will also affect the durability of the heater. It is difficult to increase the volume of the boiler 12. The present invention is an invention that can brew a larger amount of coffee than the amount of coffee in one cup (approximately 250 mL) of the large cup 46 with the conventional configuration. [Brief explanation of the drawings]

[0053] [Figure 1] 1 is an external view of an example of an electric coffee maker according to the present invention. [Figure 2] 1 is an example of an operation panel of the present invention. [Figure 3] This is an explanatory diagram of how to brew coffee using a commercially available dripper. [Figure 4] This is an explanatory diagram comparing the first 1 / 3 of the drip, the next 1 / 3 of the drip, and the last 1 / 3 of the drip when brewing one cup of coffee using a commercially available dripper. [Figure 5] 1 is an example showing basic components of a body of the present invention. [Figure 6] 7 is an example of a vertical cross section of a boiler according to the present invention (cross section AA in FIG. 7). [Figure 7] 1 is an example showing the top surface of a boiler of the present invention. [Figure 8] This is an example showing the amount of coffee in one cup, the amount of coffee powder to use, the drip rate, the amount of drip, and the amount of water to add. [Figure 9] This is an example showing the amount of coffee to brew in a coffee server, the amount of coffee powder to use, and the amount of dripping. The amounts of coffee and coffee powder in one cup in [Figure 8] and [Figure 9] are just a guideline. [Figure 10] 1 is a diagram showing types of coffee cups and coffee servers used in the present invention. [Figure 11] This is a diagram showing the types of paper filters available on the market. [Explanation of symbols]

[0054] 1. Unit 2. Operation panel 3 Power switch 4 Selector switch A 5 Start switch 6 Water tank 7 Coffee cup 8 Dripper tray 9 Dripper 10 Paper filter 11 Coffee powder 12 Boiler 13 Electric pump 14 Water supply pipe 15 Solenoid valve A 16 Solenoid valve B 17 Boiler vessel 18 Vessel lid 19 Heater 20 Temperature sensor 21 Thermostat 22 Thermal fuse 23 Water supply hole 24 Exhaust hole 25 Hot water supply hole A 26 Hot water supply hole B 27 Water level sensor 28 Normal water level 29 Upper water level 30 Exhaust port 31 Exhaust pipe 32 Hot water pipe A 33 Hot water pipe B 34 Hot water outlet A 35 Hot water outlet B 36 Control circuit 37 Check valve 38 Drip port 39 Cup holder 40 Selection switch B 41 4-cup switch 42 Buffer 43 Coffee server 44 Heating part of heater 45 small cup 46 large cup 47 Small filter 48 Large filter

Claims

1. In a drip coffee maker in which an electric pump is placed between the water tank and the boiler, and the boiler, dripper, and coffee cup or coffee server are arranged vertically from top to bottom to allow hot water to fall easily by gravity, solenoid valve A is placed between the boiler and the dripper to form a flow path for the dripping process, and solenoid valve B is placed between the boiler and the coffee cup or coffee server to form a flow path for the hot water top-up process, the amount of water for one cup of a small or large cup is controlled by controlling the operating time of the electric pump, Water can be supplied to the kettle and held to boil the water. The boiled water is used for the pre-infusion process. The solenoid valve A in the flow path for the dripping process is opened and closed to supply the necessary amount of water to the dripper, and then the solenoid valve A is closed to execute the pre-infusion process. During the dripping process, the solenoid valve A in the flow path for the dripping process is opened and closed to supply water to the dripper, and when the amount of dripped water reaches 30-100% of the amount of coffee in one small or large cup, the solenoid valve A is closed to complete the dripping process. During the water refilling process, the flow path for the water refilling process is... In a drip coffee maker with a configuration and brewing method such as controlling the opening and closing of a solenoid valve B to directly supply hot water to a coffee cup or coffee server to brew one cup of coffee (small or large), and using all the water supplied to the boiler when the process of brewing one cup of coffee is complete, the electric drip coffee maker is equipped with a control circuit that allows for brewing more coffee than one large cup when it is desired to brew more coffee than one large cup. This circuit allows for adding 50-100% of the amount of water needed for one cup of coffee to the boiler and boiling the water, then using the solenoid valve B in the water supply path to directly supply the boiled water to the coffee server to add more hot water, and using all the water supplied to the boiler when the additional water addition is complete, thus allowing for brewing more coffee than one large cup by adding extra hot water, thus removing the impurities from the drip process.

2. A drip coffee maker having the configuration of

1. , wherein the pre-infusion process is included in the dripping process, and the pre-infusion and dripping processes can be performed by controlling the opening and closing of the solenoid valve A, the drip rate of the dripping process is 30 to 100%, the hot water refilling process can be performed by controlling the opening and closing of the solenoid valve B of the flow path for the hot water refilling process to supply hot water directly to a coffee cup or coffee server to brew one cup of coffee, when the process of brewing one cup of coffee is completed, the amount of water supplied to the boiler is used up and no water remains, and one cup of coffee has been brewed. This drip-type electric coffee maker features a control circuit that allows you to brew more coffee than a standard cup, with the impurities removed, by adding 50-100% of the amount of water needed for one cup of coffee to the boiler and boiling it. The boiled water is then supplied directly to the coffee server by controlling the opening and closing of a solenoid valve B in the water channel for the water-adding process. When the water-adding is complete, the amount of water supplied to the boiler is used up, leaving no water behind.

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