JP2020054715A - Coffee maker and control method thereof - Google Patents

Abstract

To provide a coffee maker which can make tasty coffee by evenly pouring hot water into coffee powder in an extractor.SOLUTION: A coffee maker 1 includes: an extractor 23 for receiving coffee powder 111 which is ground by a mill 21 attached to a case body 2; a hot water feeding pump 8 which feeds hot water W in a water storage 6; and a plurality of annularly arrayed nozzles 37, 37A which eject into the extractor 23 the hot water W fed by the hot water feeding pump 8 and which are angled so that these nozzles 37, 37A are made to eject to the center side of the extractor 23. The coffee maker is provided with a control means by which the output of the hot water feeding pump 8 is varied from a strong output to a weak output in a steaming process. As a result the coffee powder 111 stored in a mountain shape is evened without installing a movable part in the nozzles 37, 37A, with the hot water W nearly evenly poured for suitable steaming, so that tasty coffee can be obtained in an inexpensive structure.SELECTED DRAWING: Figure 11

Description

  The present invention relates to a drip-type coffee maker that feeds coffee grounds ground by a coffee mill to an extractor and pours hot water into the coffee powder in the extractor, and a control method therefor.

  Conventionally, as a coffee maker of this kind, a main body, a mill attached to the main body, a dripper as an extractor for receiving coffee powder ground by the mill, a water storage section, and a hot water supply for sending hot water in the water storage section. It has a liquid sending means as a pump, and a plurality of nozzles arranged in an annular shape to eject hot water sent by the liquid sending means to the dripper, and these nozzles are ejected toward the center of the dripper. Is known (for example, see Patent Document 1). In this coffee maker, the plurality of nozzles are located outside the center position of the dripper, and the hot water is ejected from directly below each nozzle toward the center of the dripper, so that a recess is formed in the center of the coffee powder; It is possible to extract high-quality coffee liquid in a state where a wall-shaped portion is formed on the outer peripheral portion.

JP 2018-33772 A

  By the way, in order to make coffee delicious by hand drip, several methods have been proposed. Regardless of the method of brewing, the coffee grounds in the extractor are flattened so that hot water is evenly applied to the coffee grounds in the extractor. If these can be reproduced in a coffee maker, it is expected that delicious coffee can be brewed.

  However, not only in Patent Literature 1, but also in a conventional coffee maker with a mill, there is also a problem that it is difficult to satisfactorily put coffee, since coffee powder accumulates in a mountain shape in the extractor. That is, since the hot water hardly hits the top of the coffee powder stored in the mountain shape during the steaming process, unevenness occurs between the sufficiently steamed portion and the insufficiently steamed portion. The unevenness in the steaming stage may adversely affect the coffee liquor to be extracted. Therefore, there was room for improvement to make more delicious coffee.

  An object of the present invention is to solve the above problems and to provide a coffee maker which can brew delicious coffee by evenly pouring hot water into coffee powder in an extractor.

  A coffee maker according to claim 1 of the present invention comprises a main body, a mill attached to the main body, an extractor for receiving coffee powder ground by the mill, a water storage section, and a water supply for sending hot water in the water storage section. A hot water pump, and a plurality of annularly arranged nozzles for ejecting the hot water sent by the hot water pump to the extractor, the nozzles being angled so as to jet toward the center of the extractor. The coffee maker has a control means for changing the output of the hot water supply pump from a strong output to a weak output in a steaming step which is a step before the extraction step.

  In the coffee maker according to a second aspect of the present invention, in the first aspect, the control means changes the output of the hot water supply pump from a strong output to a weak output in the extraction step.

  The method for controlling a coffee maker according to claim 3 of the present invention includes a main body, a mill attached to the main body, an extractor for receiving coffee powder ground by the mill, a water storage section, and a water storage section. A hot water pump for feeding hot water, and a plurality of nozzles arranged in an annular shape for ejecting hot water sent by the hot water pump to the extraction tool, and these nozzles are provided at the center side of the extraction tool. In a method for controlling a coffee maker which is angled so as to be spouted, an output of the hot water pump is changed from a strong output to a weak output by a control means in a steaming step which is a step before the extraction step.

  Further, in the coffee maker control method according to a fourth aspect of the present invention, in the third aspect, in the extraction step, the output of the hot water pump is changed from a strong output to a weak output by the control means in the extraction step.

  The coffee maker according to claim 1 of the present invention is configured as described above, and the hot water pump is operated at a high output in an initial stage of hot water supply, so that hot water spouted from the plurality of nozzles. However, the coffee powder near the top collapses when it hits near the top of the pile of coffee powder. Thereafter, by lowering the output of the hot water supply pump, the falling position of the hot water spouted from the nozzle shifts from near the center of the coffee powder to the outer peripheral side. Thereby, the coffee powder is leveled, the hot water is spread almost evenly, and the steam is satisfactorily steamed without providing a movable portion in the nozzle, so that a delicious coffee can be obtained with an inexpensive configuration.

  In addition, since the control means changes the output of the hot water supply pump from a strong output to a weak output in the extraction step, the hot water drop position can be moved without providing a movable portion in the nozzle. Inexpensively, coffee components can be evenly extracted from the whole coffee powder to obtain delicious coffee.

It is a longitudinal section of an important section of a coffee maker showing an embodiment of the present invention. FIG. 3 is an exploded perspective view of the hot water supply unit. FIG. 2 is a perspective view of the extractor and the server, showing a state in which a liquid stop valve of the extractor is disassembled. FIG. It is an expanded sectional view of the hot water supply part. FIG. 3 is a plan sectional view of a main part of the same, showing a hot water supply unit viewed from below. It is the perspective view seen from the same diagonally above. It is the perspective view seen from the same diagonally below. It is explanatory drawing which shows the time change of the electric power supplied to a hot-water pump. FIG. 3 is a cross-sectional view of the periphery of the extractor immediately after coffee powder is stored. The cross-sectional views around the extraction device when erupted hot water at a duty ratio D ₁ in steaming step. The cross-sectional views around the extraction device when erupted hot water at a duty ratio D ₂ in steaming step. The cross-sectional views around the extraction device when erupted hot water at a duty ratio D ₃ in steaming step.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 is a coffee maker of the present invention. The case body 2 of the coffee maker 1 includes a rear standing portion 3, a front mounting portion 4 formed integrally with a lower portion of the standing portion 3, and an upper portion of the standing portion 3. And an eaves portion 5 formed in a uniform manner.

  The standing portion 3 is provided with a water storage portion 6, and external water can be supplied to the water storage portion 6. A heating means 7 for heating the water in the water storage section 6 and a hot water pump 8 for feeding hot water obtained by heating by the heating means 7 to a hot water supply section 22 described later are provided in the case body 2. Is provided.

  The mounting portion 4 is provided with a substantially flat heating plate 11 which is open at the top and closes this opening. A heater 12 is provided on the lower surface of the heating plate 11 in thermal contact therewith. A server 13 is removably mounted on the heating plate 11. The server 13 includes a container body 14 made of heat-resistant glass having an upper opening, a grip portion 15 made of synthetic resin attached to a side surface of the container body 14, and a synthetic resin material covering an upper opening of the container body 14. And a lid 16.

  A mill 21, a hot water supply unit 22, and an extraction tool 23 are arranged in front of the standing unit 3 above the server 13 of the placing unit 4 from above. The mill 21 is detachably fixed to the case body 2. In the drawing, S is the center of the extracting tool 23.

  The mill 21 includes a hopper 25 having an input port 24 at an upper portion, and a lid 26 that opens and closes the input port 24. The mill 21 is for crushing the coffee beans put into the hopper 25, and the coffee beans in the hopper 25 are sent to a shooter unit 27. The coffee beans sent to the shooter unit 27 are sent between the rotary blade 30 and the fixed blade 31 by a mill screw 29 rotated by a mill motor (not shown). It is ground between to become coffee powder (ground beans) 111. Further, a drop port 32 is provided at a lower portion of the mill 21, and the coffee powder 111 is dropped and supplied from the drop port 32 to the center of the extractor 23. The drop port 32 has a cylindrical shape.

  The hot water supply unit 22 is mounted around a drop port 32 of the mill 21. The hot water supply section 22 includes a connection section 35 connected to a hot water supply path 8A connected to the hot water pump 8, an annular continuous flow path 36 communicating with the connection section 35, and a continuous flow path 36. A plurality of connected nozzles 37 and 37A are provided. The continuous flow path 36 is formed continuously so as to surround the periphery of the drop port 32.

  As shown in FIG. 6, the plurality of nozzles 37 and 37A are arranged on a concentric circle centered on the center S of the extraction tool 23. The plurality of nozzles 37, 37, 37 on one side and the plurality of nozzles 37A, 37A, 37A on the other side are provided at equally spaced positions in the circumferential direction with a shutter 41 described later interposed therebetween. The nozzles 37, 37, 37 on one side and the nozzles 37A, 37A, 37A on the other side are provided at symmetrical positions with respect to the center S. The nozzle 37 and the nozzle 37A have the same configuration. The center S is located on an extension of the nozzle passage 88 of the nozzles 37 and 37A.

  Between the nozzles 37, 37, 37 on one side and the nozzles 37A, 37A, 37A on the other side, there is provided a horizontal shutter 41 that advances and retreats along the lower surface of the hot water supply unit 22. The shutter 41 has a plate shape having substantially the same width, and a tip portion 42 of the shutter 41 is formed to be narrow. At the center of the shutter 41, a communication opening 43 that can communicate with the drop port 32 is provided. In addition, in the lower part of the hot water supply part 22 or the eaves part 5, there is provided an indentation hole 44 in which the shutter 41 protrudes and protrudes, and an insertion receiving part 45 in which the tip part 42 of the shutter 41 is inserted. The lower end surface of the cylindrical packing 76 into which the lower end of the drop port 32 is inserted comes into contact with the upper surface of the shutter 41. The shutter 41 moves obliquely with respect to the front-back direction of the case main body 2.

  FIG. 6 shows a state in which the falling port 32 is closed by the shutter 41. From this state, the shutter 41 is retracted by shutter advancing / retreating means (not shown), the base end side of the shutter 41 is housed in the case main body 2, and the communication opening 43 is stopped at a position matching the drop port 32. By doing so, the drop port 32 can be opened.

  The extractor 23 has a circular upper opening 51 at an upper portion, and has an arc-shaped side plate portion 52 whose diameter is reduced downward from the upper opening 51. , Rear oblique side plate portions 53, 53 are provided. The front and rear oblique side plate portions 53 have a flat plate shape, and are connected to a substantially linear bottom portion 54 of the extraction tool 23. And the bottom part 54 is formed long in the left-right direction.

  As shown in FIGS. 7 and 8, the extracting tool 23 is stored in a storage case 55. The storage case 55 is provided together with the extraction tool 23 so as to be able to protrude and retract from the case main body 2. (In FIGS. 7 and 8, the storage case 55 is removed from the case main body 2 for easy understanding of the structure. However, in practice, the rotation projection 55A is pivotally supported with respect to the bearing recess 2A. The paper filter 56 is disposed in the extraction tool 23.

  A vertical valve hole 57 is provided at the center of the bottom 54, and a liquid stop valve 58 is provided in the valve hole 57. The liquid stop valve 58 includes a valve stem 59 inserted into the valve hole 57, a plurality of vertical recesses 60 provided vertically on the outer periphery of the valve stem 59 to form a gap between the valve hole 57, The valve includes a valve body 61 provided at an upper portion of a rod 59 and closing the valve hole 57, and a valve head 62 provided at a lower portion of the valve body 61 and having a curved lower surface. The liquid stop valve 58 is urged downward by a coil spring 63 serving as urging means provided between the bottom portion 54 and the valve head 62. 57 is closed. The valve head 62 is provided with a through hole 62A corresponding to the vertical recess 60.

  In the center of the lid 16 of the server 13, there is provided a convex part 66 having a curved surface in contact with the valve head 62, and a plurality of through holes 67 are formed below the convex part 66. . Therefore, when the server 13 is placed on the mounting portion 4, as shown in FIG. 1, the convex portion 66 pushes up the valve head 62, so that the liquid stop valve 58 is opened, and the coffee in the extraction tool 23 is opened. The liquid can drop into the container body 14 through the through hole 67.

  The hot water supply unit 22 includes a flat holder 71, a first nozzle structure 81, a second nozzle structure 82, an annular outer packing 74, and a cylindrical packing 76 provided outside the drop outlet 32. Prepare. The holder 71 is fixed to the case body 2. Further, the holder 71 has an insertion hole 72 through which the dropout hole 32 is inserted, an annular packing groove 73 provided on the lower surface of the holder 71 and into which the outer packing 74 is fitted, and the holder 71 around the insertion hole 72. It has an annular fitting recess 75 provided on the lower surface of the holder 71. Then, the upper outer side of the cylindrical packing 76 is fitted into the fitting concave portion 75. The holder 71 has a lower cylindrical portion 77 protrudingly formed around the packing groove 73. The lower cylinder portion 77 is formed coaxially with the center S, and is partially cut away. The packing groove 73 is provided above the lower cylindrical portion 77. A plurality of mounting bosses 78 are provided on the lower surface of the holder 71 on the outer peripheral side of the fitting concave portion 75. In this example, a plurality (four) of mounting bosses 78, 78, 78, 78 are provided on a concentric circle centered on the insertion hole 72. In FIG. 2, only one of the mounting bosses 78 is shown by a chain line.

  The cylindrical packing 76 is provided with a large-diameter fitting portion 79 that fits into the fitting concave portion 75 outside the upper portion of the main body 76A. A semicircular inner fitting groove 80 is formed on the outer periphery of the fitting portion 79 so as to fit inside the outer periphery of the mounting boss 78. Incidentally, four inner fitting grooves 80 are provided corresponding to the mounting bosses 78.

  The first nozzle structure 81 is provided with an upwardly directed cylindrical portion 84 on the inner peripheral portion of the annular flat plate portion 83, and the half of the cylindrical portion 84 is fitted to the outside of the outer periphery of the mounting boss portion 78. A circular outer engagement groove 85 is provided. In the first nozzle structure 81, a nozzle inner portion 86 that constitutes a part of the nozzles 37 and 37A is protruded downward from an outer peripheral portion of the flat plate portion 83. A curved inclined surface 86A is formed on the outer side of the nozzle inner portion 86, and a vertical groove 87 is vertically provided at the center of the inclined surface 86A.

  The second nozzle structure 82 integrally includes an outer fitting tube portion 91 that is fitted to the main body 76 </ b> A of the tubular packing 76 and a base portion 92 provided around the outer fitting tube portion 91. The base portion 92 has four through holes 93 corresponding to the four mounting boss portions 78. An outer cylinder 94 is provided around the base 92. Further, a nozzle outer portion 95 is obliquely provided inside the outer cylindrical portion 94 and at a lower portion on the outer peripheral side of the base portion 92. The nozzle outer portion 95 is a concave portion having substantially the same shape as the nozzle inner portion 86 except for the vertical groove portion 87, and is open at the top and bottom. The nozzle inner portion 86 is accommodated in the inner surface 95A of the nozzle outer portion 95. An engagement step 97 is provided at an upper portion around the through hole 93, and the engagement step 97 engages a lower portion of the outer engagement groove 85 of the first nozzle structure 81.

  As shown in FIG. 5, a screw 98 inserted through the through-hole 93 from below is screwed into the mounting boss portion 78, so that the holder 71, the first nozzle structure 81, the cylindrical packing 76, and the outer packing 74 are provided. And the second nozzle structure 82 are integrally assembled. In the assembled state, the inclined surface 86A comes into contact with the inner surface 95A of the nozzle outer portion 95, and the inner surface 95A and the vertical groove 87 constitute the nozzles 37 and 37A having the nozzle passage 88. Then, the tip of the nozzle passage 88 serves as a jet port 89. Further, the outer packing 74 is compressed by being sandwiched between the packing groove 73 and the tip of the outer cylindrical portion 94, whereby the holder 71, the first nozzle structure 81, and the second nozzle structure 82 form the outer packing 74. The enclosed watertight continuous flow path 36 is formed, and the continuous flow path 36 communicates with the nozzle passage 88 of the nozzles 37 and 37A. The length of the nozzle passage 88 is longer than the maximum width in the flow cross section. Further, the flow cross-sectional areas of the nozzle passages 88 of the nozzles 37 and 37A are all equal.

  As shown in FIGS. 2 and 5, the second nozzle component 82 is provided with the connection part 35 that communicates with the continuous flow path 36. Then, a hose 100 constituting a part of the hot water supply path 8A is connected to the connection portion 35.

  As shown in FIG. 6, the ejection ports 89 of the nozzles 37 and 37A are located outside the center S. The nozzles 37 and 37A are arranged so as to face the center S. Further, as shown in FIG. 1 and the like, the angle of the nozzle passage 88 with respect to the vertical direction is determined from the upper surface Cmin of the coffee powder 111 corresponding to one cup of the coffee liquid, which is the minimum number of cups to be extracted, in the extractor 23. Also below, the center lines of the hot water spouted from the nozzle passages 88 of the nozzles 37 and 37A are set so as to intersect (that is, the distance between the center lines of the hot water flowing out of the nozzle passages 88 becomes minimum). . This angle is about 20 degrees, and is preferably substantially equal to or slightly larger than the angle of the arc-shaped side plate portion 52. That is, the hot water spouted obliquely from the spout 89 toward the center of the extractor 23 falls in a parabolic shape due to gravity.

  As shown in FIGS. 7 and 8, a plurality of switches 101 for operating the coffee maker 1 are arranged on the front surface of the eaves section 5. A control circuit (not shown) is accommodated in the case body 2.

  Next, an example of a method of using the coffee maker 1 will be described. First, the user pulls out the storage case 55 horizontally from below the eaves 5, sets the paper filter 56 in the extraction tool 23, and then moves the storage case 55 horizontally below the eaves 5. Press Then, the server 13 is placed on the heating plate 11 of the placing section 4 described above. When the server 13 is set on the heating plate 11, the curved surface convex portion 66 provided on the lid 16 of the server 13 causes the curved surface valve head of the liquid stop valve 58 to move. When the liquid stops, the liquid stop valve 58 is pushed up, and the valve hole 57 provided at the bottom of the extractor 23 is released. Then, into the water storage section 6, water is added in an amount corresponding to the number of cups of the coffee liquid to be extracted. Further, the lid 26 is removed, and a predetermined amount of coffee beans is put into the hopper 25 from the input port 24. Note that, at this stage, the shutter 41 is in a state of closing the drop port 32, and the mill 21 and the inside of the extraction tool 23 are not in communication.

  When the user operates the switch 101, four operations are performed simultaneously. The first is that the shutter advance / retreat means (not shown) moves the shutter 41 toward the retractable hole 44 side. As a result, the communication opening 43 overlaps with the drop port 32, and the mill 21 communicates with the inside of the extraction tool 23. The second is to operate the mill 21. Thus, the coffee beans are ground by the mill 21 to obtain the coffee powder 111, and the coffee powder 111 is dropped and supplied from the drop port 32 into the paper filter 56 of the extractor 23. The predetermined amount is an amount corresponding to the number of cups, for example, one cup, two cups, three cups, etc. of the coffee liquid. Thirdly, the energization of the heating means 7 is started. Thereby, the water in the water storage section 6 is heated and becomes hot water W. Fourth, the energization of the heater 12 is started. Thereby, the server 13 placed on the heating plate 11 is warmed.

  As shown in FIG. 10, the coffee powder 111 that has fallen from the falling port 32 of the mill 21 is accumulated in the paper filter 56 set in the extraction tool 23 in a mountain shape centered immediately below the falling port 32. . Then, the mill 21 stops after a time sufficient to grind all the predetermined amount of coffee beans has elapsed. When the operation of the mill 21 is stopped, the shutter advance / retreat means (not shown) moves the shutter 41 to the insertion receiving portion 45 side, so that the shutter 41 closes the drop port 32. Then, after the shutter 41 closes the drop port 32, the water in the water storage section 6 becomes hot water W at a predetermined temperature (85 to 90 ° C). When it is detected that the hot water W in the water storage section 6 has reached a predetermined temperature, the power supply to the heating means 7 is stopped, and then the steaming step is started. In this steaming step, the hot water W in the water storage section 6 is sent to the hot water supply section 22 by the hot water pump 8 via the hot water path 8A, and the plurality of nozzles connected to the continuous flow path 36 Hot water W is jetted obliquely downward from 37 and 37A. After the hot water is supplied by the jet for a predetermined time, the hot water supply is stopped for a predetermined steaming time, and during this time, the coffee powder 111 is steamed.

During the hot water supply time of the steaming step, the control circuit (not shown) controls the hot water pump 8 from a high output to a low output stepwise as shown in FIG. For example, in the present embodiment, the control circuit performs PWM control, the duty ratio of the power supplied to the Okuyu pump 8 is changed D _2, D ₃ from D _1. Note that D ₁ > D ₂ > D ₃ .

The coffee powder 111 and hot water in the steaming step will be described in detail. The Okuyu pump 8 at a power duty ratio D ₁ is operated and the water W is jetted from the nozzle 37, 37a, water W is the ejected a strong momentum, as shown in FIG. 10, the mountain The coffee powder 111 collides with the coffee powder 111 at a position near the top of the coffee powder 111 stored in the shape. As described above, when the hot water W spouted with strong momentum hits near the top of the coffee powder 111, the coffee powder 111 near the top collapses to the outer peripheral side. Thereby, as shown in FIG. 11, the height difference between the top and the outer periphery of the coffee powder 111 is reduced.

Then, after a predetermined time the hot water supply at a duty ratio D _1, lowering the duty ratio D _2. When the duty ratio is reduced to _{D 2,} the force of water W ejected from the nozzles 37,37A decreases. In this way, when the strength of the hot water W to be jetted decreases, the drop position of the hot water W onto the coffee powder 111 moves to the outer peripheral side in the extractor 23. As a result, the coffee powder 111 collapses further to the outer peripheral side, and the height difference between the top and the outer periphery of the coffee powder 111 is further reduced as shown in FIG.

Then, after a predetermined time the hot water supply at a duty ratio D _2, lowering the duty ratio D _3. When the duty ratio is reduced to D _3, the momentum of the hot water W ejected from the nozzles 37,37A is further reduced. In this way, the momentum of the hot water W ejected drops, falling position to the coffee grounds 111 of the hot water W is, the duty ratio is further moved to the outer peripheral side as compared with the case of D _2. Thereby, the coffee powder 111 is further pushed to the outer peripheral side, and as shown in FIG. 13, the height difference between the top and the outer periphery of the coffee powder 111 is further reduced.

Further, after a predetermined time the hot water supply at a duty ratio D _3, stops the Okuyu pump 8 and the duty ratio to zero. Then, the coffee powder 111 is steamed for a predetermined steaming time. When the predetermined steaming time has elapsed, the steaming process ends.

  In this way, the momentum of the hot water W spouted from the nozzles 37 and 37A is gradually reduced, and the position at which the hot water W falls onto the coffee powder 111 is gradually moved to the outer peripheral side, whereby the coffee powder is discharged. The upper surface of 111 can be made smooth. Further, by pouring the hot water W spouted from the vicinity of the center to the vicinity of the outer periphery of the coffee powder 111, the hot water W can be evenly contained in the coffee powder 111 and steamed well. Further, without providing a movable part for changing the jetting direction of the nozzles 37, 37A, the hot water W drops onto the coffee powder 111 only by changing the strength of the hot water W to be jetted from strong to weak. Since the position can be gradually moved to the outer peripheral side, an inexpensive configuration can be achieved.

  When the steaming step is completed, the process proceeds to the extraction step. As described above, since the amount of water in the water storage unit 6 is an amount corresponding to the number of cups of coffee liquid to be extracted, all the hot water W in the water storage unit 6 is supplied to the extraction tool 23. In this case, a predetermined number of coffee liquids can be obtained, and the inside of the water storage section 6 becomes empty. In this case, since the hot water W is ejected obliquely from the plurality of nozzles 37 and 37A toward the center side of the extraction tool 23, even if the amount of the coffee powder 111 is different, the hot water is discharged from the portion without the coffee powder 111. The coffee ground 111 does not fall through the paper filter 56, and the hot water W spouted from the outer periphery of the coffee ground 111 does not agitate strongly. Is maintained, and a high-quality coffee liquid can be extracted. Further, as described above, the coffee powder 111 corresponding to the minimum number of cups of coffee to be extracted is lower than the uniform upper surface Cmin in the extraction tool 23 from the nozzle passage 88 of the nozzles 37 and 37A. Since the distance between the center lines of the spouted hot water W is set to be the minimum, the hot water W is directly applied to the portion of the paper filter 56 opposite to the nozzles 37 and 37A with respect to the center S. In addition, the hot water W spouted from the outer periphery of the coffee powder 111 on the opposite side of the nozzles 37 and 37A is not strongly stirred. Therefore, in the extraction step, high-quality coffee liquid can be extracted in a state where the recess 112 is formed at the center of the coffee powder 111 and the wall-shaped portion 113 is formed at the outer periphery.

  As described above, when the appropriate recesses 112 and the wall-like portions 113 are formed in the coffee powder 111, the hot water W can pass through the paper filter 56 from the coffee powder 111 almost uniformly and surely, so that good quality is obtained. Coffee liquid can be obtained. On the other hand, when the formation of the wall-like portion 113 is hindered in the outer peripheral portion of the coffee powder 111, unevenness occurs in the coffee liquid from which the hot water W is extracted due to the portion passing through the coffee powder 111. Bad taste.

Note that, also in the extraction step, the control circuit controls the hot water pump 8 from a strong output to a weak output stepwise as shown in FIG. That is, the control circuit changes the duty ratio of the power supplied to the hot water pump 8 from D ₁ to D ₂ and D ₃ . As a result, similarly to the steaming step, the position of the spouted hot water W falling onto the coffee powder 111 moves from near the center in the extraction tool 23 to the outer peripheral side. Then, in the extraction step, as shown in FIG. 9, a series of operation of changing the duty ratio from D ₁ to D ₃ is carried out several times across the predetermined downtime. Note that the extraction step ends when all the hot water W in the water storage unit 6 is sent to the extraction tool 23. By doing so, the method of brewing by pouring hot water W from the center of the extractor to the outer peripheral side by hand drip (pour in the so-called “no” shape) is reproduced, and the coffee powder is evenly distributed from the entire coffee powder. The components can be extracted and a delicious coffee can be obtained. Further, the drop position of the hot water W onto the coffee powder 111 can be obtained simply by changing the strength of the hot water W to be ejected from strong to weak without providing a movable portion for changing the ejection direction of the nozzles 37 and 37A. Can be gradually moved to the outer peripheral side, so that an inexpensive configuration can be achieved. In the present example, the stage of the duty ratio in the extraction process is the same as the stage of the duty ratio in the steaming process, but may be different from the stage of the duty ratio in the steaming process so that the coffee liquid can be more appropriately extracted. .

  After passing through the valve hole 57, the extracted coffee liquid passes through the through hole 62 A of the valve head 62 and the through hole 67 of the lid 16 of the server 13 and accumulates in the server 13. Then, when the server 13 is removed from the mounting portion 4, the liquid stop valve 58 is pushed down by the coil spring 63, and the valve body 61 closes the valve hole 57. Dropping can be prevented.

  As described above, in the present embodiment, the case main body 2 as a main body, the mill 21 attached to the case main body 2, the extraction tool 23 for receiving the coffee powder 111 ground by the mill 21, A hot water pump 8 for feeding the hot water W in the water storage section 6; and a plurality of nozzles 37, 37A arranged in an annular shape for ejecting the hot water W sent by the hot water pump 8 to the extractor 23. Then, in the coffee maker 1 in which these nozzles 37 and 37A are angled so as to be ejected toward the center side of the extraction tool 23, the output of the hot water supply pump 8 is used in the steaming step which is a step before the extraction step. It has a control means for changing from a high output to a low output. When the hot water supply pump 8 is operated at a high output in an initial stage of hot water supply, hot water ejected from the plurality of nozzles 37 and 37A is provided. However, when the coffee powder 111 near the top collapses upon hitting the vicinity of the top of the coffee powder 111 accumulated in a mountain shape, and then the output of the hot water supply pump 8 is reduced, the hot water W spouted from the nozzles 37 and 37A is reduced. Moves from the vicinity of the center of the coffee powder 111 to the outer peripheral side, so that the coffee powder 111 is leveled and the hot water W is spread almost evenly without providing a movable portion in the nozzles 37 and 37A. Because it is steamed, it is possible to obtain delicious coffee with an inexpensive configuration.

  Further, in the present embodiment, the control means changes the output of the hot water supply pump 8 from the strong output to the weak output in the extraction step, so that the hot water W is not provided in the nozzles 37 and 37A without providing a movable portion. Can be moved, so that coffee components can be extracted from the whole coffee powder evenly with an inexpensive configuration, and a delicious coffee can be obtained.

  Hereinafter, as an effect of the embodiment, the nozzles 37 and 37A communicate with the common continuous flow passage 36, and the flow cross-sectional area of the continuous flow passage 36 is formed larger than the flow cross-sectional area of the nozzle passage 88. Accordingly, the hot water can be substantially uniformly ejected from the nozzles 37 and 37A. In addition, since the nozzles 37 and 37A are configured by assembling the nozzle components 81 and 82, the nozzles 37 and 37A can be manufactured at a lower cost as compared with a case where the nozzles are individually mounted. Further, the continuous flow path 36 communicating with the nozzle passage 88 can be easily formed by the nozzle constituent bodies 81 and 82 and the holder 71. The plurality of nozzles 37, 37, 37 on one side are arranged at equal intervals on a concentric circle centered on the center S of the extraction tool 23, and the plurality of nozzles 37A, 37A, 37A on the other side are Since the extractors 23 are arranged at equal intervals on a concentric circle about the center S of the extractor 23, hot water can be supplied substantially uniformly.

  Further, since the drop port 32 of the mill 21 is provided at the center of the nozzles 37 and 37A, the coffee powder 111 can be dropped and supplied to the center of the extractor 23. Further, the drop port 32 can be closed by the shutter 41 serving as an opening / closing means, and furthermore, a cylindrical packing 76 is provided around the drop port 32, and the cylindrical packing 76 comes into contact with the upper surface of the shutter 41. Thus, the invasion of steam into the mill 21 can be prevented.

  It should be noted that the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the invention. For example, in the present embodiment, the control circuit performs the PWM control to gradually decrease the duty ratio of the power supplied to the hot water pump, but the power is changed by another method (for example, PAM control). You may do so. In the present embodiment, the duty ratio in the steaming step is three, but the number of steps is arbitrary as long as it is two or more, and may be four or more. Similarly, the number of steps of the duty ratio in the extraction step is arbitrary as long as it is two or more, and may be four or more, for example. Furthermore, in the present embodiment, the duty ratio and the number of steps in the steaming step and the extraction step are the same, but the duty ratio and the number of steps may be different in the steaming step and the extraction step.

1 coffee maker 2 case body (body)
6 reservoir 8 Okuyu pump 21 mils 23 extraction tools 37 nozzles 37A nozzles 111 coffee powder D _{1, D} 2, _{D 3} duty ratio W Yu

Claims (4)

A main body, a mill attached to the main body, an extractor for receiving coffee grounds ground by the mill, a water storage section, a hot water pump for feeding hot water in the water storage section, and hot water sent by the hot water pump. A plurality of nozzles arranged in an annular shape to eject the extractor, and these nozzles are angled so as to eject toward the center side of the extractor,
A coffee maker, comprising: control means for changing the output of the hot water supply pump from a strong output to a weak output in a steaming step which is a step before the extracting step.   The coffee maker according to claim 1, wherein the control unit changes the output of the hot water pump from a strong output to a weak output in the extraction step. A main body, a mill attached to the main body, an extractor for receiving coffee grounds ground by the mill, a water storage section, a hot water pump for feeding hot water in the water storage section, and hot water sent by the hot water pump. A plurality of nozzles arranged in an annular shape to eject to the extractor, and these nozzles are angled so as to eject to the center side of the extractor, the coffee maker control method,
A method for controlling a coffee maker, wherein the control means changes the output of the hot water supply pump from a strong output to a weak output in a steaming step which is a step prior to the extracting step. 4. The method according to claim 3, wherein in the extracting step, the output of the hot water pump is changed from a strong output to a weak output by the control means.