JPH0354568B2 - - Google Patents

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.

Conventional Technology Conventionally, a fully automatic coffee boiler that has a coffee bean grinding function and a dripping function, and which automatically switches to the dripping function after grinding the coffee beans, has the configuration shown in Figure 5. It has been known. That is, the coffee boiler having the configuration shown in FIG. 5 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 at the bottom there is a filter 4 that separates the extract and the residue.
After the coffee beans are ground with the cutter 3, the water stored in the water tank 5 is introduced into the water pipe 8 formed integrally with the heater 7 through the check valve 6, and is heated. Hot water was pushed up by the steam pressure generated and led to a discharge pipe 8' located above the container 1, and coffee was obtained by pouring the hot water into the container 1 from the discharge pipe 8'.

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. This will quickly damage the filter media, as described above.
That is, the filter 4 must be placed on the bottom surface of the container 1, which is relatively less susceptible to centrifugal force. In addition, regarding the material of the filter 4, the paper that is normally used for coffee extraction will be extremely easily damaged during grinding of coffee beans.
A mesh filter 4 made of stainless steel wire is used.

In general, a good pulverizer produces less fine powder,
Moreover, it is a condition that the particle size can be ground according to the user's preference.

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 gaps 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.

As described above, the coffee extracted by the coffee brewer shown in FIG. 5 was extremely tasteless and cloudy due to the inclusion of fine coffee powder.

The present invention takes into account the above-mentioned conventional problems, and makes it possible to obtain properly ground coffee powder that suits the user's taste, and also to enable extraction in a short time without clogging the filter material, thereby producing delicious and cloudy coffee. The aim is to provide an electric coffee brewer that can be used in a variety of ways.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention makes it possible to freely change the rotational direction of the cutter in the raw material crushing chamber, and the holes in the perforated plate provided in the communication section between the raw material crushing chamber and the filtration chamber. One end is large and the other end is small.

Effect In the above configuration, if the cutter rotates from the side of the perforated plate with larger holes to the side with smaller holes, coffee powder with a larger particle size is quickly transferred to the filtration chamber, and if the direction of rotation of the cutter is reversed Coffee powder with a small particle size is quickly transferred to the filtration chamber side.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings. In FIGS. 1 to 7, 11 is a main body, and this main body 11 has a crushing filter chamber 12 for crushing coffee beans and extracting coffee liquid stored in its upper part in a freely removable manner, and a drive motor 13 in its lower part. It has a built-in structure and a tank 14 (not shown) for storing water can be detachably attached to the back. A switch 20 is interposed in the winding circuit of the drive motor 13, and the direction of rotation can be changed by switching the switch 20. The pulverization and filtration chamber 12 includes a substantially cylindrical raw material pulverization chamber 15 that incorporates a cutter 14 that is rotationally driven by a drive motor 13.
and a filtration chamber 16 for accommodating and extracting the coffee beans ground in the raw material crushing chamber 15 are assembled in parallel, and the raw material crushing chamber 15 and the filtration chamber 16 are part of the peripheral wall of the raw material crushing chamber 15. They communicate through a perforated plate 17 provided in the. The perforated plate 17 has small holes 21 arranged at one end and large holes 22 arranged at the other end. In the case of rotation, a large amount of coarse powder is discharged.

The bottom part 18 of the raw material crushing chamber 15 is formed into a mortar shape, and the porous plate 17 is connected to the raw material crushing chamber 15.
By arranging the coffee beans so as to cut a circle drawn by the peripheral wall 5, when the coffee beans are ground, the coffee beans are appropriately stirred and ground uniformly, and when they reach an appropriate particle size, they are immediately discharged to the filtration chamber 16. That's what I do.

Reference numeral 19 in the figure is a time switch, which allows the user to arbitrarily set the operating time of the drive motor 13 according to the amount of beans.When the set time elapses, the drive motor 1
3 to energization to the heater 23. Further, 23 is a container for receiving filtered coffee liquid.

The operation of the above configuration will now be described.
First, the rotation direction of the drive motor 13 is selected using the switch 20 to obtain the desired particle size, and then the required amount of coffee beans is introduced into the raw material grinding chamber 15, and water is supplied to the tank. Next time switch 19
When set to a predetermined time and energization is started, the drive motor 13 is activated and grinds the coffee beans. Then, the ground coffee beans are sequentially discharged into the filter chamber 16 through the perforated plate 17. When this discharge is completed, the drive motor 13 stops, electricity is switched to the heater 23, and coffee extraction starts. If the powder discharged at this time is fine, a strong coffee liquid will be extracted, and if the powder is rough, a thin coffee liquid will be extracted.

Effects of the Invention As is clear from the above description of the embodiments, according to the present invention, it is possible to easily obtain a coffee liquid having a strength according to the user's preference by operating a switch, and moreover, the coffee beans have a predetermined particle size. Since the coffee beans are immediately discharged, there is little need for repeated grinding, which minimizes the oxidation of the coffee beans due to the frictional heat during grinding, and also reduces the generation of fine powder. According to the present invention, it is possible to extract coffee liquid of high quality by using a paper filter medium with excellent filtration properties.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of an electric coffee boiler showing an embodiment of the present invention, FIGS. The figure shows a circuit diagram of the same coffee boiler, FIG. 4 shows a perspective view of the same coffee boiler, and FIG. 5 shows a longitudinal sectional view of the conventional coffee boiler. 11...Main body, 12...Crushing filter chamber, 13...
Drive motor, 14... Cutter, 15... Raw material crushing chamber, 16... Filtration chamber, 17... Perforated plate, 20...
...Switch, 21...Small hole, 22...Big hole.

Claims (1)

[Claims] 1 A raw material crushing chamber and a filtration chamber are arranged side by side so as to communicate through a perforated plate, the rotational direction of a cutter provided in the raw material crushing chamber can be changed freely, and a large hole is provided at one end of the perforated plate, and a large hole is provided at the other end of the perforated plate. An electric coffee boiler with small holes on the side.