TW202014134A - Coffee maker and control method thereof - Google Patents

Abstract

To provide a coffee maker that can evenly pour hot water to coffee powder in an extractor so as to brew tasty coffee. [Solution] A coffee maker which is equipped with: an extractor for receiving coffee powder ground by a grinder mounted on an outer housing main body, a hot water delivering pump for delivering the hot water in a water storing portion, and a plurality of nozzles arranged to be in an annular shape and allowing the hot water delivered by the hot water delivering pump to be ejected toward the extractor, and the nozzles are angled in such a manner that it ejects toward the central side of the extractor. By a controlling mechanism capable of changing the output of the hot water delivering pump from a strong output to a weak output in a blooming step, the coffee maker can allow the coffee powder piled up like a mountain to be flattened and roughly evenly applied by hot water to bloom well without requiring to provide a movable portion to the nozzle, thereby capable of obtaining tasty coffee with a low-cost constitution.

Description

Coffee making machine and its control method

Field of invention The invention relates to a drip filter coffee maker and its control method. The drip filter coffee maker delivers coffee powder ground by a coffee grinder to an extractor, and injects hot water into the coffee powder in the extractor.

Background of the invention Conventionally, as such a coffee maker, the following are known: a main body, a grinder mounted on the main body, a filter cup as an extractor that receives coffee powder ground by the grinder, a water storage section, and a storage tank for transporting the coffee A liquid delivery mechanism of a hot water delivery pump for hot water in the water section, and a plurality of nozzles arranged in a ring shape that eject hot water delivered by the liquid delivery mechanism to the filter cup, and these nozzles are directed toward the filter cup The angle of the center of the nozzle is angled (for example, refer to Patent Document 1). Since the plurality of nozzles are located outside the center position of the filter cup, and the hot water is sprayed to the center side of the filter cup directly below each nozzle, the coffee maker can A high-quality coffee liquid is extracted in a state where a depression is formed in the central portion and a wall-shaped portion is formed in the outer peripheral portion. Advanced technical literature Patent Literature

[Patent Document 1] Japanese Patent Laid-Open No. 2018-33772

Problems to be solved by the invention By the way, in order to brew coffee deliciously by hand drip filter, several methods have been disclosed. In either brewing method, the coffee powder in the extractor becomes flat, so that hot water is evenly applied to the coffee powder in the extractor. It is expected that as long as these methods can be reproduced in the coffee maker, delicious coffee can be brewed.

However, it is not limited to Patent Document 1. In a conventional coffee maker with a grinder, coffee powder is accumulated in the shape of an extractor, so there is also a problem that it is difficult to brew coffee well. That is to say, during the simmering step, hot water hardly comes into contact with the vicinity of the apex of the coffee powder accumulated in a mountain shape, and therefore, unevenness occurs between the part that is sufficiently simmered and the part where the simmering is insufficient. The unevenness in this steaming stage may have an adverse effect on the extracted coffee liquor. Therefore, there is room for improvement in order to brew more delicious coffee.

An object of the present invention is to provide a coffee maker capable of solving the above problems and injecting hot water into the coffee powder in the extractor evenly to brew delicious coffee. Means to solve the problem

The coffee maker described in claim 1 of the present invention includes a main body, a grinder mounted on the main body, an extractor that receives coffee powder ground by the grinder, a water storage section, and heat for transferring hot water in the water storage section A plurality of nozzles arranged in a ring shape to form a ring of water delivery pumps and hot water delivered by the hot water delivery pumps to the extractor, and the nozzles are angled so as to be discharged toward the center side of the extractor, The coffee maker has a control mechanism that changes the output of the hot water delivery pump from a strong output to a weak output in the simmering step, which is the previous step of the extraction step.

In addition, in the coffee maker described in claim 2 of the present invention, in claim 1, the control mechanism changes the output of the hot water delivery pump from a strong output to a weak output in the extraction step.

In addition, the control method of the coffee maker described in claim 3 of the present invention is a control method of a coffee maker having a main body, a grinder mounted on the main body, and an extractor that receives coffee powder ground by the grinder , A water storage section, a hot water delivery pump that transports hot water in the water storage section, and a plurality of nozzles arranged in a ring shape that eject hot water delivered by the hot water delivery pump to the extractor, and these nozzles Angled in such a way that it is sprayed toward the center side of the extractor, the control method of the coffee maker is to change the output of the hot water delivery pump from a strong output by a control mechanism in the steaming step which is the first step of the extraction step For weak output.

Furthermore, in the control method of the coffee maker described in claim 4 of the present invention, in claim 3, in the extraction step, the output of the hot water delivery pump is changed from a strong output to a weak output by the control mechanism. Invention effect

The coffee maker described in claim 1 of the present invention is constructed as described above, and at the initial stage of hot water supply, the hot water delivery pump is operated with a strong output, whereby hot water ejected from the plurality of nozzles comes into contact with The coffee powder accumulated in the shape of a mountain is near the vertex, and the coffee powder near the vertex collapses. Then, by lowering the output of the hot water supply pump, the drop position of the hot water sprayed from the nozzle moves from the vicinity of the center of the coffee powder to the outer peripheral side. Thereby, without providing a movable portion in the nozzle, the coffee powder can be flattened, and hot water can be applied substantially evenly to perform steaming well, and therefore, delicious coffee can be obtained with an inexpensive structure.

In addition, the output of the hot water delivery pump is changed from a strong output to a weak output in the extraction step by the control mechanism, and it is possible to move the falling position of the hot water without providing a movable part in the nozzle, so The composition of the coffee powder is extracted from the whole coffee powder, so as to obtain delicious coffee.

Forms for carrying out the invention Hereinafter, an embodiment of the present invention will be described based on FIGS. 1 to 10. 1 is the coffee maker of the present invention. The housing body 2 of the coffee maker 1 includes a rear standing portion 3, a front mounting portion 4 integrally formed with the lower portion of the standing portion 3, and an eaves portion integrally formed with the upper portion of the foregoing standing portion 3 5.

The water storage unit 6 is provided in the upright installation unit 3, and external water can be supplied to the water storage unit 6. Furthermore, a heating mechanism 7 that heats the water of the water storage unit 6 and a hot water delivery pump 8 that delivers hot water heated by the heating mechanism 7 to the following hot water supply unit 22 are provided in the housing body 2 .

The mounting portion 4 is provided with a substantially planar heating plate 11 so as to open upward and close the opening. Furthermore, a heater 12 is provided on the lower surface of the heating plate 11 in thermal contact with each other. The container 13 is detachably placed on the heating plate 11. The container 13 includes a container body 14 made of heat-resistant glass that opens upward, a synthetic resin grip 15 attached to the side surface of the container body 14, and a cover 16 made of synthetic resin that covers the upper opening of the container body 14 .

A grinder 21, a hot water supply part 22, and an extractor 23 are arranged at the front of the standing portion 3 and above the container 13 of the placing portion 4 from above to below. The grinder 21 is detachably fixed to the casing body 2. In addition, S in the figure is the center of the aforementioned extractor 23.

The grinder 21 includes a hopper 25 having an inlet 24 at the upper portion, and a lid 26 that opens and closes the inlet 24. In addition, the grinder 21 grinds the coffee beans put into the hopper 25, and the coffee beans in the hopper 25 are transported to the blower unit 27. The coffee beans conveyed to the blower unit 27 are conveyed between the rotary knife 30 and the fixed knife 31 by a grinder screw 29 rotated by a grinder motor (not shown), and the rotary knife 30 and the fixed knife 31 It is ground into coffee powder (ground beans) 111. In addition, a drop port 32 is provided in the lower part of the grinder 21, and the coffee powder 111 is dropped from the drop port 32 and supplied to the center of the extractor 23. In addition, the aforementioned drop opening 32 has a cylindrical shape.

The hot water supply part 22 is attached around the drop port 32 of the grinder 21. The hot water supply unit 22 includes a connection portion 35 connected to the hot water delivery path 8A connected to the hot water delivery pump 8, an annular continuous flow path 36 communicating with the connection portion 35, and the continuous flow path 36 Plural nozzles 37, 37A. In addition, the continuous flow path 36 is continuously formed so as to surround the periphery of the dropping port 32.

As shown in FIG. 6, the plural nozzles 37 and 37A are arranged on a concentric circle centered on the center S of the extractor 23. The plurality of nozzles 37, 37, and 37 on one side and the plurality of nozzles 37A, 37A, and 37A on the other side are provided at equal intervals in the circumferential direction via the baffle plate 41 described below. In addition, the nozzles 37, 37, and 37 on one side and the nozzles 37A, 37A, and 37A on the other side are provided at positions symmetrical with respect to the aforementioned center S. In addition, the nozzle 37 and the nozzle 37A have the same configuration. In addition, the center S is located on the extension of the nozzle passage 88 of the nozzles 37 and 37A.

Between the nozzles 37, 37, 37 on the one side and the nozzles 37A, 37A, 37A on the other side, a baffle 41 in the horizontal direction that advances and retreats along the lower surface of the hot water supply portion 22 is provided. The baffle 41 has a plate shape with substantially the same width, and the front end portion 42 of the baffle 41 has a narrow width. Furthermore, a communication opening 43 that can communicate with the drop port 32 is provided in the center of the baffle 41. In addition, an inflow hole 44 through which the baffle plate 41 is infested is provided under the hot water supply portion 22 or the eave portion 5, and an insertion receiving portion 45 into which the front end portion 42 of the baffle plate 41 is inserted is provided. In addition, the lower end surface of the cylindrical gasket 76 into which the lower end of the dropping port 32 is inserted abuts on the upper surface of the baffle 41. In addition, the shutter 41 advances and retreats obliquely with respect to the front-rear direction of the housing body 2.

FIG. 6 shows a state in which the drop opening 32 is blocked by the baffle 41. The baffle 41 is retracted from this state by a baffle advancing and retreating mechanism (not shown), and the base end side of the baffle 41 is housed in the housing body 2 so that the communication opening 43 is opposed to the drop port 32 Stopping at the accurate position, by which the drop opening 32 can be opened.

The extractor 23 has a circular upper opening 51 at the upper portion, and has an arc-shaped side plate portion 52 whose diameter decreases downward from the upper opening 51, and is provided with a front-rear inclined side plate inclined forward and backward to the arc-shaped side plate portion 52部53,53. These front and rear inclined side plate portions 53 and 53 form a flat plate shape and are connected to the substantially linear bottom portion 54 of the extractor 23. Moreover, the bottom 54 is formed longer in the left-right direction.

As shown in FIGS. 7 and 8, the extractor 23 is stored in a storage box 55. The storage box 55 is provided with the extractor 23 so as to be freely accessible to the housing body 2. (In FIGS. 7 and 8, in order to facilitate understanding of the structure, the storage box 55 is removed from the housing body 2, but in reality, the rotation protrusion 55A is pivotally supported in the horizontal direction with respect to the bearing recess 2A In addition, a filter paper 56 is arranged in the extractor 23 described above.

A longitudinal valve hole 57 is provided in the center of the aforementioned bottom 54, and a liquid stop valve 58 is provided in this valve hole 57. The liquid stop valve 58 includes a valve stem 59 inserted through the valve hole 57, a plurality of longitudinal recesses 60 provided longitudinally on the outer periphery of the valve stem 59 and forming a gap with the valve hole 57, and provided on the valve stem 59 The valve body 61 that covers the valve hole 57 at the upper portion of the valve and the valve head 62 that is provided at the lower portion of the valve body 61 and has a curved surface on the lower surface. In addition, the liquid stop valve 58 is biased downward by the coil spring 63 as a biasing mechanism provided between the bottom portion 54 and the valve head portion 62, so the valve hole 57 is always blocked by the valve body 61. In addition, in the valve head portion 62, a through hole 62A is bored corresponding to the longitudinal recess 60.

In addition, a convex portion 66 in the shape of a curved surface abutting against the valve head 62 is provided in the center of the lid 16 of the container 13, and a plurality of through holes 67 are bored in the lower portion of the convex portion 66. Therefore, if the container 13 is placed on the placement portion 4, then as shown in FIG. 1, the convex portion 66 pushes up the valve head 62, so the liquid stop valve 58 opens and the coffee liquid in the extractor 23 It can fall into the container body 14 through the through hole 67.

The hot water supply unit 22 includes a plate-shaped holder 71, a first nozzle structure 81, a second nozzle structure 82, a ring-shaped outer gasket 74, and a cylindrical gasket 76 externally attached to the dropping port 32. The bracket 71 is fixed to the housing body 2. In addition, the bracket 71 has an insertion hole 72 through which the dropping port 32 is inserted, an annular gasket groove 73 provided on the lower surface of the bracket 71 and into which the outer gasket 74 is fitted, and around the insertion hole 72 An annular fitting recess 75 provided on the lower surface of the bracket 71 is provided. Furthermore, the upper outer side of the cylindrical washer 76 is fitted into the fitting recess 75. In addition, a lower cylindrical portion 77 is protrudingly formed around the washer groove 73 on the bracket 71. The lower tube portion 77 is formed coaxially with the aforementioned center S, and is partially cut away. In addition, the washer groove 73 is provided on the upper portion of the lower cylinder portion 77. In addition, a plurality of mounting bosses 78 protrude from the lower surface of the bracket 71 and protruding from the outer peripheral side of the fitting recess 75. In this example, a plurality of (four) mounting bosses 78, 78, 78, 78 are provided on a concentric circle centered on the aforementioned insertion hole 72. In addition, in FIG. 2, only one chain line illustrates the aforementioned mounting boss portion 78.

The cylindrical washer 76 is provided with a large-diameter fitting portion 79 fitted into the fitting concave portion 75 outside the upper portion of the main body 76A. Furthermore, a semi-circular inner fitting groove portion 80 that is fitted outside the outer periphery of the mounting boss portion 78 is provided on the outer periphery of the fitting portion 79. In addition, four inner fitting grooves 80 are provided corresponding to the aforementioned mounting bosses 78.

The first nozzle structure 81 is provided, and an inner cylindrical portion 84 of an annular flat plate portion 83 is provided with an upward cylindrical portion 84, and the cylindrical portion 84 is provided with an outer portion fitted outside the outer periphery of the mounting boss portion 78. The semicircular outer engaging groove portion 85. In addition, in the first nozzle structure 81, a nozzle inner portion 86 that constitutes a part of the nozzles 37 and 37A protrudes downward from the outer peripheral portion of the flat plate portion 83. A curved inclined surface 86A is formed outside the nozzle inner portion 86, and a vertical groove 87 is provided longitudinally at the center of the inclined surface 86A.

The second nozzle structure 82 integrally includes an outer fitting cylindrical portion 91 that is fitted over the main body 76A of the cylindrical gasket 76 and a base portion 92 provided around the outer fitting cylindrical portion 91. Furthermore, in this base portion 92, four through holes 93 are bored corresponding to the four aforementioned mounting boss portions 78. In addition, an outer cylinder portion 94 protrudes around the base portion 92. Furthermore, a nozzle outer portion 95 is provided obliquely inside the outer cylindrical portion 94 and at a lower portion on the outer peripheral side of the base portion 92. In addition, the nozzle outer portion 95 is a concave portion that is substantially the same shape as the nozzle inner portion 86 except for the longitudinal groove portion 87 and is open up and down. In addition, the nozzle inner portion 86 is housed in the inner surface 95A of the nozzle outer portion 95. In addition, an engagement step 97 is provided at an upper portion around the through hole 93, and the engagement step 97 is engaged with a lower portion of the outer engagement groove 85 of the first nozzle structure 81.

As shown in FIG. 5, by screwing the screw 98 inserted through the through hole 93 from the bottom to the mounting boss 78, the bracket 71, the first nozzle structure 81, the cylindrical washer 76, and the outer washer 74 are attached The second nozzle structure 82 is assembled into one body. In the assembled state, the inclined surface 86A abuts on the inner surface 95A of the nozzle outer portion 95, and the inner surface 95A and the vertical groove portion 87 constitute the nozzles 37 and 37A having the nozzle passage 88. In addition, the front end of the nozzle passage 88 becomes a discharge port 89. In addition, the outer washer 74 is sandwiched between the washer groove 73 and the front end of the outer cylindrical portion 94 and compressed, thereby being surrounded by the holder 71, the first nozzle structure 81 and the second nozzle structure 82 The water-tight continuous channel 36 and the nozzle passage 88 of the nozzles 37 and 37A communicate with the continuous channel 36. In addition, the length of the nozzle passage 88 is longer than the maximum width of its flow cross-section. In addition, the flow passage 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 structure 82 is provided with the connection portion 35 communicating with the continuous flow path 36. Furthermore, a hose 100 that constitutes a part of the hot water delivery path 8A described above is connected to the connecting portion 35.

As shown in FIG. 6, the discharge ports 89 of the nozzles 37 and 37A are located outside the center S. In addition, 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 is such that the center line of the hot water ejected from the nozzle passages 88 of the nozzles 37 and 37A intersects below the upper surface Cmin (that is, In other words, the distance between the center lines of the hot water flowing out from the nozzle passages 88 is set to a minimum, and the upper surface Cmin is to make the coffee powder 111 corresponding to the minimum number of extraction cups, that is, one cup of coffee liquid, in the extractor. Flat income within 23 years. This angle is about 20 degrees, and is preferably approximately equal to or slightly larger than the angle of the arc-shaped side plate portion 52. That is to say, the reason is that the hot water obliquely discharged from the discharge port 89 toward the center side of the extractor 23 falls in a parabolic shape due to gravity.

In addition, as shown in FIGS. 7 and 8, a plurality of switches 101 that operate the coffee maker 1 are arranged on the front surface of the eave portion 5. In addition, a control circuit (not shown) is housed in the aforementioned case body 2.

Next, an example of how to use the coffee maker 1 will be described. First, the user pulls the storage box 55 horizontally from below the eaves portion 5 and places the filter paper 56 in the extractor 23, and then moves the storage box 55 horizontally below the eaves portion 5 Push. Then, the container 13 is placed on the heating plate 11 of the placement portion 4. In addition, when the container 13 is placed on the heating plate 11, the curved surface-shaped convex portion 66 provided on the lid body 16 of the container 13 abuts on the curved surface-shaped valve head 62 of the liquid stop valve 58 As a result, the liquid stop valve 58 is pushed up, and the valve hole 57 provided at the bottom of the extractor 23 is opened. Then, an amount of water corresponding to the number of cups of extracted coffee liquid is placed in the water storage unit 6. Furthermore, the lid 26 is removed, and a predetermined amount of coffee beans is put into the hopper 25 from the inlet 24. Further, at this stage, the baffle 41 is blocking the dropping port 32, and the grinding machine 21 and the extractor 23 are not in communication.

Then, when the user operates the aforementioned switch 101, four actions are performed simultaneously. The first is that the shutter advance and retreat mechanism (not shown) moves the shutter 41 toward the emergence hole 44 side. As a result, the communication opening 43 overlaps the dropping port 32, and the grinder 21 communicates with the inside of the extractor 23. The second is to operate the aforementioned grinder 21. By this, the coffee beans are ground by the grinder 21 to obtain coffee powder 111 which is dropped from the dropping port 32 and supplied into the filter paper 56 of the extractor 23. In addition, the aforementioned predetermined amount is an amount corresponding to the number of cups such as one cup, two cups, and three cups of coffee liquid. The third is to start the energization of the aforementioned heating mechanism 7. As a result, the water in the water storage unit 6 is heated to become hot water W. Furthermore, the fourth is to start the energization of the heater 12. With this, the container 13 placed on the heating plate 11 is heated.

The coffee powder 111 dropped from the dropping port 32 of the grinder 21 is placed in the filter paper 56 of the extractor 23, and as shown in FIG. 10, is accumulated in a mountain shape centered directly under the dropping port 32. Then, after a sufficient time has passed to grind all the predetermined amount of coffee beans, the aforementioned grinder 21 is stopped. In addition, when the operation of the grinder 21 is stopped, the shutter 41 is moved toward the insertion receiving portion 45 by the shutter advance and retreat mechanism (not shown), and the shutter 41 blocks the drop port 32. Then, after the baffle 41 blocks the dropping port 32, the water in the water storage unit 6 becomes hot water W of a predetermined temperature (85 to 90°C). When it is detected that the hot water W in the water storage section 6 reaches a predetermined temperature, the energization of the heating mechanism 7 is stopped, and then, the steaming step is started. In this simmering step, the hot water W in the water storage unit 6 is transported to the hot water supply unit 22 via the hot water transport path 8A by the hot water transport pump 8 and connected to the continuous flow path 36 The plurality of nozzles 37 and 37A discharge hot water W diagonally downward. After the hot water supply is performed for a predetermined time by this discharge, the hot water supply for a predetermined steaming time is stopped, during which the coffee powder 111 is steamed.

In addition, during the hot water supply time in the simmering step, the control circuit (not shown) controls the hot water delivery pump 8 from a strong output to a weak output in stages as shown in FIG. 9. For example, in the present embodiment, the control circuit performs PWM (Pulse Width Modulation) control to change the duty ratio of the electric power supplied to the hot water delivery pump 8 from D ₁ to D ₂ , D ₃ . In addition, D ₁ >D ₂ >D ₃ .

The coffee powder 111 and hot water in the steaming step will be described in detail. When the hot water delivery pump 8 operates with the electric power of the duty ratio D ₁ and hot water W is sprayed from the nozzles 37 and 37A, the sprayed hot water W accumulates close to the water as shown in FIG. 10 with a strong water potential The position of the apex of the aforementioned coffee powder 111 in a mountain shape collides with the coffee powder 111. In this way, when the hot water W sprayed with a strong water potential hits the vicinity of the vertex of the coffee powder 111, the coffee powder 111 near the vertex collapses toward the outer peripheral side. As a result, as shown in FIG. 11, the height difference between the vertex of the coffee powder 111 and the outer periphery becomes smaller.

Then, after the hot water is supplied at the duty ratio D _{1 for} a predetermined time, the duty ratio is reduced to D ₂ . Reduced to _two when the duty ratio D, the nozzles 37,37A ejected from the hot water W is decreased water potential. In this way, when the water potential of the discharged hot water W decreases, the hot water W moves toward the outer peripheral side in the extractor 23 at the falling position of the coffee powder 111. As a result, the coffee powder 111 further collapses toward the outer peripheral side, and as shown in FIG. 12, the difference in height between the vertex of the coffee powder 111 and the outer periphery is further reduced.

Then, after the hot water is supplied at the duty ratio D _{2 for} a predetermined time, the duty ratio is reduced to D ₃ . When the duty ratio is reduced to D ₃ , the water potential of the hot water W ejected from the aforementioned nozzles 37 and 37A further decreases. In this way, when the water potential of the discharged hot water W decreases, the hot water W moves further to the outer periphery side than the case where the duty ratio is D ₂ at the falling position of the coffee powder 111. With this, the coffee powder 111 is further pushed out to the outer periphery side, and as shown in FIG. 13, the difference in height between the vertex of the coffee powder 111 and the outer periphery is further reduced.

Furthermore, after the hot water is supplied at the duty ratio D _{3 for} a predetermined time, the duty ratio is set to 0, and the hot water delivery pump 8 is stopped. Then, the steamed coffee powder 111 is scheduled for a steaming time. When the predetermined steaming time has passed, the steaming step ends.

In this way, the water potential of the hot water W sprayed from the nozzles 37 and 37A is gradually reduced, and the hot water W is gradually moved to the outer peripheral side at the falling position of the coffee powder 111, whereby the The upper surface can become gentle. In addition, by injecting the hot water W sprayed from the vicinity of the center of the coffee powder 111 toward the periphery of the outer periphery, the coffee powder 111 can contain the hot water W evenly, and the steaming can be performed satisfactorily. Furthermore, without providing a movable portion that changes the ejection direction of the nozzles 37 and 37A, the hot water W can be dropped on the coffee powder 111 only by weakening the water potential of the ejected hot water W from strong to weak. Since the position gradually moves to the outer peripheral side, it can be an inexpensive structure.

When the steaming step ends, the transition to the extraction step is made. In addition, as described above, the amount of water in the water storage unit 6 corresponds to the number of cups of the extracted coffee liquid. Therefore, if all the hot water W in the water storage unit 6 is supplied to the extractor 23 Then, a predetermined number of coffee liquids are obtained, and the inside of the aforementioned water storage section 6 becomes empty. In this case, the hot water W is discharged obliquely from the plural nozzles 37 and 37A toward the center side of the extractor 23, so even if the amount of the coffee powder 111 is different, the hot water will not pass through the portion without the coffee powder 111 The aforementioned filter paper 56 falls, and the hot water W sprayed does not strongly stir the outer periphery of the coffee powder 111, and the state of the appropriate coffee powder 111 recessed in the center as shown in FIG. 1 during extraction can be extracted, and high quality can be extracted Coffee liquid. In addition, as described above, the nozzle passage 88 of the nozzles 37 and 37A is located below the flat upper surface Cmin of the coffee extractor 111 corresponding to the minimum number of extraction cups, that is, one cup of coffee liquid. The distance between the center lines of the sprayed hot water W is set to the minimum, so that the hot water W is not directly applied to the portion of the filter paper 56 that is opposite to the nozzles 37 and 37A across the center S and is sprayed The hot water W does not vigorously stir the outer periphery of the coffee powder 111 on the opposite side of the nozzles 37 and 37A. Therefore, in the extraction step, it is possible to form a state in which the recess 112 is reliably formed in the central portion of the coffee powder 111 and the wall portion 113 is formed in the outer peripheral portion, thereby extracting high-quality coffee liquid.

In this way, when appropriate recesses 112 and wall-shaped portions 113 are formed in the coffee powder 111, the hot water W passes through the filter paper 56 from the coffee powder 111 approximately uniformly and surely, and therefore, high-quality coffee liquid can be obtained. On the other hand, when the formation of the wall-shaped portion 113 is hindered in the outer peripheral portion of the coffee powder 111, the hot water W causes unevenness in the extracted coffee liquid due to passing through the portion of the coffee powder 111. Therefore, the obtained coffee liquid The taste is adversely affected.

In the extraction step, the control circuit also controls the hot water delivery pump 8 from a strong output to a weak output in stages as shown in FIG. 9. In other words, the control circuit changes the duty ratio of the electric power supplied to the hot water delivery pump 8 from D ₁ to D ₂ and D ₃ . Thereby, the hot water W ejected moves from the vicinity of the center in the extractor 23 to the outer peripheral side at the drop position of the coffee powder 111, as in the case of the steaming step. Furthermore, in the extraction step, as shown in FIG. 9, a series of operations for changing the duty ratio from D ₁ to D ₃ are performed multiple times with a predetermined pause time. In addition, the extraction step is completed by transferring all the hot water W in the water storage unit 6 to the extractor 23. In this way, the brewing method of injecting hot water W from the center of the extractor toward the outer periphery side by so-called hand drip filter (so-called "の" injection) was reproduced, and the components of coffee can be extracted from the whole coffee powder without omission, Thereby obtaining delicious coffee. Furthermore, without providing a movable portion that changes the ejection direction of the nozzles 37 and 37A, the hot water W can be placed at the falling position of the coffee powder 111 only by weakening the water potential of the ejected hot water W from strong to weak Since it gradually moves to the outer peripheral side, it can be an inexpensive structure. In addition, in this example, the stage of the duty cycle in the extraction step is the same as the stage of the duty cycle in the steaming step, but in order to be able to extract coffee liquid more appropriately, it may be the same as the duty cycle in the steaming step Than the stage.

After passing through the valve hole 57, the extracted coffee liquid passes through the through hole 62A of the valve head 62 and the through hole 67 of the lid 16 of the container 13, and is accumulated in the container 13. Then, when the container 13 is detached from the placing portion 4, the liquid stop valve 58 is pressed down by the coil spring 63, and the valve body 61 closes the valve hole 57. Therefore, it is possible to prevent coffee liquid from the The extractor 23 drops.

As described above, this embodiment is a coffee maker 1 having a housing body 2 as a main body, a grinder 21 mounted on the housing body 2, an extractor 23 that receives coffee powder 111 ground by the grinder 21, and a water storage section 6. A hot water delivery pump 8 that delivers hot water W in the water storage unit 6 and a plurality of nozzles 37 arranged in a ring shape that eject the hot water W delivered by the hot water delivery pump 8 to the extractor 23 37A, and the nozzles 37, 37A are angled so as to spray toward the center side of the extractor 23, the coffee maker 1 has The control mechanism whose output changes from a strong output to a weak output, by actuating the hot water delivery pump 8 with a strong output at the initial stage of hot water supply, the hot water W discharged from the plurality of nozzles 37, 37A comes into contact with the accumulation Near the apex of the mountain-shaped coffee powder 111, the coffee powder 111 near the apex collapses, and thereafter, by reducing the output of the hot water supply pump 8, the drop position of the hot water W ejected from the nozzles 37, 37A is from the coffee Since the center of the powder 111 moves toward the outer peripheral side, it is possible to flatten the coffee powder 111 without applying a movable part to the nozzles 37 and 37A, and apply hot water W substantially evenly to perform a good steaming, so it can be inexpensive Composition to get delicious coffee.

In addition, in the present embodiment, the control mechanism changes the output of the hot water delivery pump 8 from a strong output to a weak output in the extraction step, thereby enabling the hot water W to be provided without providing a movable portion in the nozzles 37 and 37A. The falling position of the is moved. Therefore, the components of the coffee can be extracted from the whole coffee powder with an inexpensive structure, and delicious coffee can be obtained.

In the following, as an effect in the embodiment, the nozzles 37 and 37A communicate with the common continuous flow path 36, and the flow cross-sectional area of the continuous flow path 36 is formed to be larger than the flow cross-sectional area of the nozzle passage 88. Hot water can be ejected from the nozzles 37 and 37A substantially uniformly. In addition, since the nozzles 37 and 37A are constructed by assembling the nozzle structures 81 and 82, it can be manufactured at a lower cost than when the nozzles are mounted one by one. Furthermore, the continuous flow path 36 communicating with the nozzle passage 88 can be easily formed by the nozzle structures 81 and 82 and the bracket 71. In addition, the plural nozzles 37, 37, 37 on one side are arranged at equal intervals on a concentric circle centered on the center S of the extractor 23, and the plural nozzles 37A, 37A on the other side, 37A is arranged at equal intervals on a concentric circle centered on the center S of the extractor 23, so that hot water can be supplied substantially uniformly.

In addition, since the dropping port 32 of the grinder 21 is provided in the center of the nozzles 37 and 37A, the coffee powder 111 can be dropped and supplied to the center of the extractor 23. In addition, the drop opening 32 can be closed by the shutter 41 as an opening and closing mechanism, and a cylindrical gasket 76 is provided around the drop opening 32 and the cylindrical gasket 76 abuts on the shutter 41 Because of the surface, it is possible to prevent the penetration of steam into the aforementioned grinder 21.

In addition, the present invention is not limited to the above embodiments, and various changes can be implemented within the scope of the gist of the invention. For example, in this embodiment, the control circuit performs PWM control to reduce the duty cycle of the electric power supplied to the hot water delivery pump step by step, but other methods (for example, PAM (pulse amplitude modulation, pulse amplitude modulation) Change) control, etc.) to change the power. In addition, in the present embodiment, the duty cycle stages in the steaming step are three stages, but the number of stages is arbitrary as long as it is two or more, and may be four stages or more. Similarly, the number of steps of the duty cycle in the extraction step is arbitrary as long as it is two or more steps, and may be four or more steps, for example. Furthermore, in the present embodiment, the duty ratio and the number of stages in the stuffing step and the extraction step are the same, but the duty ratio and the number of steps may be different in the stuffing step and the extraction step.

1: Coffee maker 2: Shell body (main body) 2A: Bearing recess 3: Erect installation part 4: Mounting part 5: Eaves part 6: Water storage part 7: Heating mechanism 8: Hot water delivery pump 8A: Hot water delivery Path 11: Heating plate 12: Heater 13: Container 14: Container body 15: Grip part 16: Lid 21: Grinding machine 22: Hot water supply 23: Extractor 24: Input port 25: Hopper 26: Lid 27: Injection machine part 29: Grinding screw 30: Rotary knife fixed knife 31: Fixed knife 32: Drop opening 35: Connection part 36: Continuous flow path 37: Nozzle 37A: Nozzle 41: Baffle 42: Front end 43: Communication opening 44: emergence hole 45: insertion receiving portion 51: upper opening 52: arc-shaped side plate portion 53: front and rear inclined side plate portion 54: bottom 55: storage box 55A: rotating protrusion 56: filter paper 57: valve hole 58: Liquid stop valve 59: stem 60: longitudinal recess 61: valve body 62: valve head 62A: through hole 63: coil spring 66: convex portion 67: through hole 71: bracket 72: insertion hole 73: washer groove 74: Outer washer 75: fitting recessed part 76: cylindrical washer 76A: cylindrical washer body 77: lower cylindrical part 78: mounting boss part 79: fitting part 80: inner fitting groove part 81: first nozzle structure 82 : 2nd nozzle structure 83: flat plate part 84: cylinder part 85: outer engagement groove part 86: nozzle inner part 86A: inclined surface 87: vertical groove part 88: nozzle passage 89: discharge port 91: outer fitting cylinder part 92 : Base part 93: Through hole 94: Outer cylinder part 95: Nozzle outer part 95A: Inner surface of the nozzle outer part 97: Engagement step 98: Screw 100: Hose 101: Switch 111: Coffee powder 112: Recess 113 : Wall part Cmin: upper surface D ₁ , D ₂ , D ₃ : duty ratio S: center of extractor W: hot water

FIG. 1 is a longitudinal cross-sectional view showing a main part of a coffee maker according to an embodiment of the present invention. 2 is an exploded perspective view of the hot water supply unit of the coffee maker. 3 is a perspective view of an extractor and a server of the same coffee maker, and shows a state in which the liquid stop valve of the extractor is exploded. Fig. 4 is an overall explanatory view of the coffee maker. 5 is an enlarged cross-sectional view of the hot water supply unit of the coffee maker. 6 is a plan cross-sectional view of the main part of the same coffee maker, and shows a state when the hot water supply unit is viewed from below. Fig. 7 is a perspective view of the coffee maker as seen from diagonally above. Fig. 8 is a perspective view of the same coffee maker as viewed obliquely from below. FIG. 9 is an explanatory diagram showing the temporal change of the electric power supplied to the hot water delivery pump of the coffee maker. 10 is a cross-sectional view of the vicinity of the extractor immediately after the coffee powder is accumulated in the coffee maker. 11 is a cross-sectional view around the extractor of the same coffee maker when hot water is discharged at a duty ratio D ₁ in the steaming step. 12 is a cross-sectional view around the extractor of the same coffee maker when hot water is sprayed at a duty ratio D ₂ in the steaming step. 13 is a cross-sectional view around the extractor of the coffee maker when hot water is sprayed at a duty ratio D ₃ in the steaming step.

23: Extractor

32: drop mouth

35: Connection

36: continuous flow path

37: Nozzle

37A: Nozzle

41: Bezel

56: filter paper

89: spout

111: coffee powder

W: hot water

Claims (4)

A coffee making machine includes a main body, a grinder installed on the main body, an extractor that receives coffee powder ground by the grinder, a water storage section, a hot water delivery pump that transports hot water in the water storage section, and a control mechanism The hot water delivered by the hot water delivery pump is sprayed toward the extractor in a plurality of nozzles arranged in a ring, and the nozzles are angled so as to be sprayed toward the center side of the extractor. The coffee maker is characterized by: It has a control mechanism that changes the output of the hot water delivery pump from a strong output to a weak output in the simmering step, which is the previous step of the extraction step. The coffee maker of claim 1, wherein in the extraction step, the aforementioned control mechanism changes the output of the aforementioned hot water delivery pump from a strong output to a weak output. A control method of a coffee maker having a main body, a grinder mounted on the main body, an extractor that receives coffee powder ground by the grinder, a water storage section, and conveying heat of hot water in the water storage section A plurality of nozzles arranged in a ring shape to form a ring of water delivery pumps and hot water delivered by the hot water delivery pumps to the extractor, and the nozzles are angled so as to be discharged toward the center side of the extractor, The control method of the coffee maker is characterized by: In the simmering step which is the previous step of the extraction step, the output of the hot water delivery pump is changed from a strong output to a weak output by the control mechanism. As in the control method of the coffee maker of claim 3, in the extraction step, the output of the hot water delivery pump is changed from a strong output to a weak output by the control mechanism.

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