JPH0423529B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric coffee brewer having a coffee bean grinding function.

BACKGROUND ART A conventional electric coffee boiler of this type having a coffee bean grinding function has a structure as shown in FIG.

That is, the main body 20 includes a raw material crushing chamber 23 equipped with a cutter 22 that is rotatably driven by a built-in motor 21 that rotates in one direction, and a filtration chamber 23 that is attached via a perforated plate 24 that constitutes a part of this raw material crushing chamber 23. The raw material crushing chamber 23 has a chamber 25 in which the coffee powder, which is crushed to an appropriate particle size by the cutter 22, passes through a perforated plate 24 and is accumulated in the filtration chamber 25. Thereafter, the water stored in the tank is heated by the heating device 26, and the water is heated from the discharge port 27 to the filtration chamber 25.
Coffee extraction was completed by dripping the coffee into the cup.

Problems to be Solved by the Invention However, with this type of structure, the particle size distribution of the coffee powder that has been crushed by the cutter and accumulated in the filtration chamber is always constant, and the "thickness" generally required for coffee is always constant. There was a problem in that it was impossible to adjust the temperature (so-called regular, mild, etc.).

This is due to the following reasons.

In other words, the main factors that determine the particle size distribution of ground coffee powder are the impact force of the cutter when grinding coffee beans, the size of the holes in the perforated plate through which the ground coffee powder passes, and the size of the holes in the perforated plate through which the ground coffee powder passes. However, since the structure is not designed to make these factors variable, the particle size distribution of the coffee that is crushed in the raw material crushing chamber and accumulated in the filtration chamber is always constant. It is clear that

Therefore, the present invention provides a means for arbitrarily changing the state of particle size distribution of ground and accumulated coffee powder, thereby making it possible to adjust coffee to a desired strength.

Means for Solving the Problems Technical means of the present invention for solving the above problems include a raw material grinding chamber equipped with a cutter that is rotatably driven by a bidirectionally rotatable motor installed in the main body; , a heating device and a filtration chamber attached through a perforated plate provided in a part of the raw material crushing chamber, the perforated plate having an angle with respect to a center line passing through the rotation center of the cutter. It was established.

Effects The effects of this technical means are as follows.

That is, by installing a perforated plate for discharging ground coffee powder at an angle to the rotational center line of the cutter, which is driven by a motor that can rotate in both directions, The degree of coffee powder discharge can be varied.

In other words, it is possible to change the length of time that coffee beans are being crushed in the raw material crushing chamber, and accordingly, the particle size distribution of the coffee powder that has been completely crushed and accumulated in the filtration chamber changes.

By dropping hot water into the coffee powder in this state, it is possible to extract coffee of the desired strength.

Embodiment An embodiment of the present invention will be described below based on the accompanying drawings.

In FIGS. 1 to 7, 1 is a main body equipped with a bidirectionally rotatable motor 3 and a heating device 4 below by means of an appropriate changeover switch 2. A substantially cylindrical raw material crushing chamber 6 equipped with a cutter 5 which is rotationally driven by the motor 3 is mounted in a removable manner.

Reference numeral 7 denotes a perforated plate installed on the side wall of the raw material crushing chamber 6. Coffee powder stored in the raw material crushing chamber 6 and crushed by the high-speed rotation of the cutter 5 to an appropriate particle size is transferred to the perforated plate 7. It is discharged to the outside through the small hole 8 provided, and is collected in a filter chamber 10 which is attached to the raw material crushing chamber 6 and has a paper filter medium 9 installed inside.

The perforated plate 7 is installed at an angle θ with respect to a center line passing through the center of rotation of the cutter 5.

A lid 11 is attached to the upper openings of the raw material grinding chamber 6 and the filtration chamber 10, and a dripping port 12 is provided on the filtration chamber 10 side of the lid 11 to uniformly disperse and drip hot water into the accumulated coffee powder. is provided.

After the coffee beans have been crushed and accumulated in the filtration chamber 10, the appropriate time switch 13 is turned on and the heating device 4 is started to be energized. The water stored in the is heated as it passes through the water pipe 14 and becomes hot water.
It drips from the discharge port 15 provided above the filtration chamber 10.

This hot water drips from the dripping port 12 provided in the lid 11, passes through the coffee grounds accumulated in the filtration chamber 10, extracts the soluble components of the coffee, and
Coffee liquid is stored in a cup 17 through a discharge port 16 provided below the cup 1.

Next, the operation of the configuration of this embodiment will be explained.

The tip of the cutter 5 on both sides
It is bent upward at an angle α with respect to the center line of the cutter 5, which creates a propeller effect as the cutter 5 rotates at high speed, stirring the coffee beans sufficiently and reducing the particle size to an appropriate size. An air flow is created for discharging the dead material from small holes 8 provided in a perforated plate 7 to a filtration chamber 10.

On the other hand, FIG. 4 shows a model for the force for discharging ground coffee powder caused by the high-speed rotation of the cutter 5.

In Figures 4a and 4b, the coffee powder pulverized by the cutter 3 to an appropriate particle size flies in the tangential direction of the rotation locus circle of the cutter 3 mainly due to the centrifugal force generated by the high speed rotation of the cutter 3. do.

At this time, the perforated plate 7 is placed in front of the flight direction of the coffee powder.
If there is, the coffee powder passes through the small holes 8 provided in the perforated plate 7 and is accumulated in the filtration chamber 10, but the coffee powder flying out in other directions hits the side wall of the raw material grinding chamber 6. It rebounds and is crushed again by the cutter 3, resulting in an even finer powder.

At this time, since the perforated plate 7 is installed at an angle θ with respect to the center line passing through the rotation center of the cutter 3, for example, in figure a, the perforated plate 7 flies in a direction within the range of angle θ ₁ . Coffee powder pulverized to an appropriate size is discharged, and in figure b, the angle is θ ₂ , which is clearly geometrically θ ₁ <θ ₂ .

That is, in the case of Fig. a, the amount of coffee powder discharged is small, and the coffee beans stored in the raw material grinding chamber 6 stay in the raw material grinding chamber 6 for a longer time, so that the coffee beans are finely ground by the cutter 5. , filtration chamber 10
It will be accumulated in

Figure 5 shows the particle size distribution of coffee powder when the bidirectionally rotatable motor 3 is rotated clockwise and counterclockwise, with the horizontal axis representing the particle size and the vertical axis representing the crushed coffee powder. It shows the ratio to the total amount of coffee powder, and it can be seen that the particle size distribution differs depending on the rotation direction of the motor 3.

According to coffee extraction theory, when the grain size of coffee powder is coarse, the total surface area is small, so
Unnecessary soluble components are difficult to extract, resulting in a hot, pale coffee, and when the coffee particles are fine, a dark, mushy coffee can be obtained.

Effects of the Invention In the present invention, the perforated plate through which the coffee powder passes is installed at an angle to the center line of the cutter, so the particle size distribution of the coffee powder can be easily changed by simply changing the direction of rotation of the cutter. You can extract coffee to your desired strength.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a coffee boiler according to an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is a view taken along arrow B in Fig. The figure is a model diagram showing the effects of the same coffee boiler, Figure 5 is a particle size distribution diagram of coffee powder in the same coffee boiler, Figure 6 is a circuit diagram of the same coffee boiler, and Figure 7 is a coffee boiler. FIG. 8 is a perspective view of the entire coffee boiler, and a vertical sectional view showing a conventional coffee boiler. 1...Main body, 3...Motor, 4...Heating device,
5... Katsuta, 6... Raw material grinding chamber, 7... Perforated plate, 10... Filtration chamber.

Claims (1)

[Claims] 1 A raw material grinding chamber equipped with a cutter that is rotatably driven by a bidirectionally rotatable motor installed in the main body, and a filtration chamber that is attached via a perforated plate installed in a part of this raw material grinding chamber. , a heating device, wherein the perforated plate is installed at an angle with respect to a center line passing through the rotation center of the cutter.