JPS61234817A - Electric coffee brewer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric coffee brewer with a coffee bean grinding function.

BACKGROUND OF THE INVENTION Conventionally, a fully automatic coffee boiler in which a coffee bean grinding function and a drip function are integrated, and which automatically switches to the drip function after grinding coffee beans, is shown in Figs. 6 and 8. A configuration as shown is known.

That is, the coffee boiler having the configuration shown in FIG. 6 has a container 1 in which a coffee bean grinding chamber and a filtration chamber for extracting coffee liquid and separating the extract and residue are integrated. 1 is equipped with a cutter 3 which is rotationally driven by a drive motor 2, and a filter 4 at the bottom for separating the extract and the residue, and after the coffee beans are ground by the cutter 3, they are stored in a tank 5. Water is introduced into a water pipe 8 formed integrally with the heater 7 through a check valve e, and the steam pressure generated by heating 9 pushes up the hot water and guides it into the discharge pipe 81 located above the container 1. Coffee was obtained by pouring hot water into the container 1 through the discharge pipe 81.

Problems to be Solved by the Invention However, in this configuration, when the coffee beans are ground, the cutter 3 rotates at high speed and generates a large centrifugal force. Therefore, as mentioned above, the filter medium, i.e. the filter 4, must be placed at the bottom of the container 1, where it is relatively unaffected by centrifugal forces.

Also, regarding the material of the filter 4, since paper, which is normally used for extracting coffee, would be extremely easily damaged during grinding of coffee beans, a mesh filter 4 made of stainless steel wire is used. .

Generally speaking, in order to extract high-quality coffee, the grinding must have an appropriate particle size and a small amount of fine powder (particle size finer than 48 mesh). The condition is to complete the extraction in a short time at a high temperature of 96°C. In addition,
In order to complete extraction in a short time, the filtration capacity of the filter medium must be sufficient, the coffee grounds must be sufficiently swollen by pouring hot water, and an appropriate filtration layer must be formed on the coffee grounds themselves. The key is to pour the hot water quietly and continuously without stirring the layers. On the other hand, pulverization with the above-described configuration results in a high-speed pulverization state in a closed space as shown in pulverization engineering, and generates an extremely large amount of fine powder. In addition, during extraction, the filtration area of the filter 4 is narrow, coffee powder clogs the filter 4 during grinding, and a large amount of fine powder fills the voids between coffee particles, resulting in an extremely long filtration time. As a result, it usually took 7 to 12 minutes to brew 5 cups of coffee.

Furthermore, with the hot water supply system described above, a sufficient temperature increase cannot be expected, and the hot water supply, extraction temperature, and time characteristics are shown in FIG. In FIG. 7, the curve A indicates the hot water supply temperature, the curve at the mouth indicates the extraction temperature, and the curve C indicates the extraction time.

As described above, the coffee extracted by the coffee brewer shown in FIG. 6 was extremely tasteless and cloudy due to the inclusion of fine coffee powder.

The coffee boiler shown in FIG. 8 is constructed independently of a coffee bean grinding chamber 9 and a filtration chamber 10 for extracting coffee liquid and separating the extracted liquid and residue using a filter medium such as a paper filter. A drive motor 1 is provided in the coffee bean grinding chamber 9.
A part of the peripheral wall of the coffee bean grinding chamber 9 is provided with a porous portion 13 for discharging the ground coffee powder, and a transfer pipe 14 connects the porous portion 13 and the filtration chamber 10. When the coffee beans are ground to an appropriate particle size in the coffee bean grinding chamber 9, they are sequentially discharged from the porous portion 13 onto the filter medium 15 installed in the filtration chamber 1o. When this discharge is completed, coffee is extracted using the same principle as the conventional example shown in FIG.

The configuration shown in FIG. 8 above improves the generation of fine powder during pulverization and the filtering ability of the filter medium compared to the conventional example shown in FIG. 6, but it has extremely large problems in operability during use. ing.

Usually, coffee beans contain a lot of oil and fat, and the ground coffee powder becomes sticky and easily adheres to the side wall of the coffee bean grinding chamber 9. Therefore, all of the beans ground in the coffee bean grinding chamber 9 are not discharged to the filtration chamber 10, but remain partially attached to the inner wall of the transfer pipe 14. When extracting the next time, the generated steam enters the transfer pipe 14 and condenses, so that the adhered coffee powder does not come off easily.
During repeated grinding of coffee beans and extraction of coffee, the transfer pipe 14 becomes clogged and stops its discharge function. In order to solve this problem, it is necessary to remove and clean the coffee bean grinding chamber 9 each time it is used, but in this case, it is often forgotten and there are many parts to be cleaned, so it is very time-consuming. It required Furthermore, since the ground coffee powder is discharged at a high speed, even if it is once led out to the filter medium 16 disposed in the filtration chamber 1o, it will rebound and scatter, and some of the coffee powder will be discharged from the filter medium 16.
This has caused a number of problems, such as coffee powder entering the gap between the coffee powder and the filtration chamber 1o, and causing coffee powder to mix into the extract when coffee is extracted.

In view of the above-mentioned conventional problems, the present invention is an electric coffee boiler that grinds coffee beans to an appropriate particle size, extracts high-quality coffee, and allows easy cleaning of the raw material grinding chamber and filtration chamber after use. The purpose is to provide

Means for Solving the Problems In order to solve the above problems, the present invention provides a raw material grinding chamber which includes a built-in cuffer that is rotationally driven by a drive motor, and which has a porous portion in a part of the cylindrical peripheral wall. , a filtration chamber arranged in parallel so as to communicate with the raw material crushing chamber through a porous section, a tank for storing water, a heating section for heating the water in this tank, and a water heater for supplying hot water to the filtration chamber. The filtration chamber and the raw material grinding chamber are integrally formed, and the main body is removably equipped, and the filtration chamber is removably equipped with a filter medium for filtering coffee, and the filtration chamber is removably equipped with a filter medium for filtering coffee. A second filter is provided at the bottom.

Effect According to the above configuration, the coffee beans ground in the raw material grinding chamber are blown to the outer periphery by the centrifugal force generated by the rotation of the cutter, and are sequentially transferred from the perforated plate to the filtration chamber.
The particle size is uniform without over-grinding, and the amount of fine powder is reduced. Furthermore, even if coffee powder enters the gap between the filtration chamber and the filter material,
The second filter provided at the bottom of the filtration chamber can prevent coffee powder from getting mixed into the coffee liquid. This results in
Delicious, high-quality coffee can be obtained with no coffee powder mixed into the coffee liquid. In addition, the raw material crushing chamber and the filtration chamber are integrally formed and are detachably attached to the main body, so they can be cleaned at the same time after use, and both the raw material crushing chamber and the filtration chamber can be cleaned at the same time. Since it has a simple configuration, it is possible to reliably wash away adhering coffee powder, and as a result, it is possible to eliminate clogging.

Embodiment Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. In Figures 1 to 4, 21 is a crushing filter container;
This crushing and filtering container 21 includes a substantially cylindrical raw material crushing chamber 24 containing a cutter 23 that is rotationally driven by a drive motor 22, and a filtering chamber that accommodates and extracts the coffee beans crushed in this raw material crushing chamber 24. 26 are arranged side by side and integrally formed, and the raw material crushing chamber 24 and the filtration chamber 25 communicate with each other via a porous portion 26 provided in a part of the peripheral wall of the raw material crushing chamber 24. Furthermore, the bottom part 27 of the raw material grinding chamber 24 is formed in a forest shape, and the porous portions 26 are arranged so as to cut a circle drawn by the peripheral wall of the raw material grinding chamber 24, so that when coffee beans are ground, the coffee beans are The particles are stirred appropriately and pulverized uniformly, and when they reach an appropriate particle size, they are immediately discharged to the filtration chamber 25. In addition, the filtration chamber 25 is provided with a lip 28 having a substantially triangular cross section in an annular shape from the height that contacts the lower edge of the porous portion 26, so that when a paper filter medium 29 is disposed,
The crushed and discharged coffee powder is made difficult to enter into the gap between the filter medium 29 and the filter chamber 26. Further, by providing a second filter 30 at the bottom of the filtration chamber 25, coffee powder entering through the gap between the filter medium 29 and the filtration chamber 26 is prevented from being mixed into the coffee liquid. As the filter medium, in addition to the paper filter medium 29, a mesh-like filter medium 31 made of metal or resin can also be used.

Reference numeral 32 denotes a lid of the crushing and filtering container 21 , and this lid 32 has a dome-shaped protrusion 34 having an inclined surface 33 in a portion located above the raw material crushing chamber 24 , and a portion located above the filtration chamber 26 . In addition, there is a hot water receiver 36 that diffuses hot water during hot water supply.
A hole 36 for discharging steam is formed. Reference numeral 37 denotes a coffee brewer main body, and this coffee brewer main body 37 has a drive motor 22 on the left leg 38, controls the operating time of this drive motor 22, and turns on electricity from the drive motor 22 after the operation is completed, as will be described later. A timer device (time switch) 40 for switching to the heater 39 is housed, and a tank 42 for storing water is formed in the right leg portion 41. This tank 42 is connected to a water pipe 44 formed integrally with the heater 39 via a check valve 43 provided at the bottom. In addition, the coffee boiler main body 3
7 is a space for storing a coffee receiver 46, and an inclined surface 46 is formed on the earthen bridge connecting the left and right legs 38, 41, so that the coffee receiver 45 can be attached and detached. In addition to making it easier, this also prevents the steam generated from the coffee that accumulates in the coffee receiver 45 from condensing. Further, the pulverization and filtration container 21 in which the raw material pulverization chamber 24 and the filtration chamber 25 are integrally formed is detachably attached to the coffee boiler main body 37.

Reference numeral 47 denotes a tapping chamber formed in a dome shape from a transparent heat-resistant resin and for reducing the discharge steam pressure.The upper surface 48 of the tapping chamber 47 has a substantially cylindrical weight portion 49 and its outer periphery. A steam discharge hole 50 is provided at the bottom surface 51, and a discharge port 62 with one end open toward the top surface and the other end connected to the water pipe 44, and a drain port 53 are provided. Further, below the water outlet 53, it is rotatably supported on the coffee boiler main body 3a, and is always supported by a spring 54 in the direction of the filtration chamber 25.
That is, a hot water guide 55 biased in the direction of the arrow is provided, and the hot water flowing out from the hot water outlet 53 can be selectively guided to either the tank 42 or the filtration chamber 26 via the open end 61. In addition, the hot water guide 66 has a notch 5.
There are 6.

57 is a thermally responsive member disposed near the bottom of the tank 42;
This thermally responsive member 57 is made of a shape memory alloy, and when the water temperature in the tank 42 is low, it is in a compressed state by succumbing to the expansion pressure of the spring 68, but when the water temperature reaches the shape memory temperature, Shape memory alloy 67 stretches and hooks 59
The rod 60, which is integrally formed with the above, is pushed down in the direction of arrow B. Note that this shape memory alloy 57 is N1-T:
Made of L alloy, it has high rust resistance and is harmless.

The hook 59 of the rod 6o is attached to the hot water guide 55 where the open end 61 of the hot water guide 55 is located on the tank 42 side.
It is engaged with and locked in the notch 56 of. Also rod 6o
One end protrudes, and by pushing this protrusion 62, the engagement between the hook 59 of the rod 60 and the notch 56 of the hot water guide 56 can be released at any time. 63 is a lid of the coffee boiler body 37, and this lid 63 serves to prevent dust and the like from entering the appliance body.

The operation of the above configuration will be explained next.

First, the lid 63 is opened and the open end 61 of the hot water guide 56 is held on the tank 42 side, then the lid 32 of the crushing filter container 21 is opened, a predetermined amount of coffee beans is put into the raw material crushing chamber 24, and the filter medium 29 At the same time, the tank 42 is supplied with the required amount of water and the lid 32
and close 63.

Next, after setting the time switch 40 to a predetermined time, when electricity is started, the drive motor 22 is activated and the coffee beans are ground. The ground coffee beans are then sequentially discharged into the filter chamber 25 through the porous portions 26. When this discharge is completed, the drive motor 22 is stopped and the power supply to the heater 39 is switched.

When this heater 39 is energized, the water filled in the water pipe 44 is heated and eventually begins to boil locally. At this time, the water filled in the water pipe 44 does not flow back to the tank 42 side due to the presence of the check valve 43 due to the boiling pressure.
Hot water is ejected through the discharge port 52 into the hot water receiving chamber 4, but the pressure of this ejection is weakened by the weight part 49 and separated into steam and hot water, and the hot water is dripped into the hot water guide 66 through the hot water outlet 63.
The water is returned to the tank 42 again, and unnecessary components such as limescale are discharged from the steam exhaust hole 5o along with the steam.

When this operation is continuously repeated, the water temperature in the tank 42 gradually rises. Initially, the temperature of the water spouted from the discharge port 62 is 80 to 90°C, but as the water temperature in the tank 42 rises, the temperature of the water jetted from the discharge port 62 also rises, and eventually reaches a boiling state of nearly 100°C. becomes. Tank 4 at this time
By setting the temperature of the water in 2 to the memory temperature of the shape memory alloy 67, the shape memory alloy 57 expands against the force of the bias spring 58, moving the rod 6o downward. As a result, the hook 59 of the rod 6o and the notch 5 of the hot water guide 55
As a result, the hot water guide 55 rotates, and its open end 61 is located above the filter chamber 25. As a result, the hot water heated to 100°C is dispersed by the hot water receiver 34 and dripped onto the coffee grounds. In addition, in the early stage when the hot water is circulating through the tank 42 and the water pipe 44, the boiling that occurs in the water pipe 44 is intermittent boiling, so low-temperature hot water is spouted from the discharge port 52 intermittently, but continuously. When the water reaches a boiling state, an extremely large amount of hot water at 100°C is continuously spouted from the outlet 52. Therefore, the filtration chamber 2
5 is continuously supplied with a predetermined amount of hot water.

Figure 6a shows the temporal changes in the temperature of the hot water spouted from the outlet 52, the water temperature in the tank 42, and the extraction temperature in the filtration chamber 25 based on the above-mentioned operation. The graph shows the temperature changes over time when coffee is extracted without circulating hot water.

When coffee is extracted after circulating the hot water, as shown in Figure 5B, the time required for the coffee to be made will be longer;
2, and hook 59 of rod 6° and hot water guide 6.
If the engagement with the notch 56 of 5 is released and electricity is supplied in this state, coffee can be extracted in the conventional time.

Effects of the Invention As described above, according to the present invention, there is provided a raw material crushing chamber which incorporates a cutter that is rotatably driven by a drive motor and has a porous portion in a part of the peripheral wall, and a raw material crushing chamber that is connected to the raw material crushing chamber through the porous portion. The filtration chamber and the raw material grinding chamber are integrally formed, and the filtration chamber is detachably installed in the main body, and the filtration chamber includes a filter material for filtering coffee. In addition to being equipped with a removable filter, a second filter is installed at the bottom of the filtration chamber, making it possible to obtain coffee powder with a uniform particle size and less fine particles. Even if coffee powder enters the gap in the filtration chamber, the second filter can reliably prevent this coffee powder from entering the coffee liquid, resulting in high-quality, delicious coffee without any coffee powder contamination. liquid can be obtained. Furthermore, in terms of operability during use, cleaning can be performed very easily and reliably, and conventional problems such as clogging can be solved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an electric coffee brewer showing one embodiment of the present invention, FIG. 2 is an exploded perspective view of the same coffee brewer, and FIG.
The figure is a perspective view of the same coffee boiler, Figure 4 is an enlarged sectional view of the main part of the same coffee boiler, and Figure 5a is a 9-hour characteristic diagram of coffee extraction temperature during circulation operation in the same coffee boiler. ,
Figure 5 is a 9-hour characteristic diagram of the coffee extraction temperature when there is no circulation, Figure 6 is a side sectional view of a conventional fully automatic electric coffee brewer that integrates the coffee bean grinding chamber and the filtration chamber, and Figure 7 The figure is a coffee extraction temperature time characteristic diagram of the coffee brewer shown in FIG. 6, and FIG. 8 is a side sectional view of a conventional fully automatic electric coffee brewer in which a coffee bean grinding chamber and a filtration chamber are arranged side by side. 22... Drive motor, 23... Cutter, 24... Raw material crushing chamber, 25... Filtration chamber, 26... Porous section, 29... Filter medium, 3o... Second filter, 37...
・Coffee boiler body, 39... Heater (heating part), 42... Tank. Name of agent: Patent attorney Toshio Nakao and 1 other person22
--Ichigogai Moog 23-m-Kaggu 24- Fee #Gyoshu 25-Itori 26-11 Hole 2q-Material 3o-11 Second fill 37--Coffee return device is also not used. Figure 2 Figure 4 Figure 5 (L) (Figure 6

Claims (1)

[Claims] A raw material crushing chamber has a built-in cutter that is rotationally driven by a drive motor installed in the main body, and has a porous part in a part of the cylindrical peripheral wall, and communicates with this raw material crushing chamber through the porous part. The filtration chamber includes filtration chambers arranged in parallel, a tank provided in the main body and containing water, a heating section that heats the water in the tank, and a water supply device that supplies hot water to the filtration chamber. and a raw material grinding chamber are integrally formed, and the main body is removably equipped, and the filtration chamber is removably equipped with a filter for filtering coffee, and a second filter is installed at the bottom of the filtration chamber. Electric coffee brewer provided.