JPS6342908Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a coffee mill that grinds coffee beans placed in a mill case using a rotatably driven cutter. Concerning a coffee grinder that achieves coarseness.

It is generally accepted that using freshly ground coffee powder is necessary to extract delicious coffee, but in order to improve the taste, it is necessary to use freshly ground coffee powder to extract delicious coffee. It is essential for Sato to remove unnecessary and defective components.

In particular, the astringent skin called silver skin, which is a component of coffee beans, and the fine powder produced by grinding impair the original taste of coffee, so so-called specialty shops remove this astringent skin and fine powder. Some places even extract coffee liquid.

However, in conventional coffee mills used in ordinary households, the entire coffee beans are ground in one go, so that the astringent skin and fine powder are mixed uniformly in the ground coffee powder, making it extremely difficult and troublesome to separate them after grinding.

Therefore, in view of the conventional situation as described above, the present invention conveys the astringent skin and fine powder by the air flow generated by the centrifugal fan effect of the impeller installed on the rotating cutter during coffee bean grinding. The purpose of the present invention is to provide a coffee mill that uses a trapping configuration to easily and reliably remove the defective components and to obtain coffee powder with a more uniform grinding coarseness.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 4.

In Figures 1 to 3, reference numeral 1 denotes a motor case with a built-in motor 2 for rotationally driving a cutter for grinding coffee beans, which will be described later.A cutter 4 for grinding coffee beans is mounted on the motor case 1. A mill case 3 is removably placed thereon, and the rotation of the motor 2 is transmitted to the cutter 4 through coupling rings 6 and 6'. 7
is a mill lid that is removably fitted to the mill case 3, and a partition plate 8 is removably attached inside the mill lid 7 to partition the space formed by this and the mill case 3 into a chamber A and a chamber B. ing.

A central communication hole 17 is provided in the center of the partition plate 8 to communicate the chambers A and B, and the periphery of the communication hole 17 on the chamber A side is provided with an annular wall 14 projecting upward. Further, the periphery of the communication hole 17 on the chamber B side extends downward to form a cylinder 9, which faces directly above the cutter 4.

On the chamber B side of the partition plate 8, there is a cutter 4 C in Fig. 2.
A guide 10 is provided that curves from the outer periphery toward the center in accordance with the rotational direction shown in FIG. Furthermore, this communication hole 1
A shielding guide 11 is bent downward at 8 to guide an air flow, which will be described later, from chamber B to chamber A in a direction opposite to the direction of rotation of cutter 4.

On the other hand, reference numeral 5 denotes a blade wheel formed upwardly in a part of the cutter 4, which effectively creates an air flow upward in the chamber B when the cutter 4 rotates.

Further, an inclined surface 16 for attaching a blade portion 15 is formed on the surface of the cutter 4 on the rotation direction side opposite to the surface on the side where the impeller is formed, that is, on the lower surface of the other end.

Next, the coffee bean grinding process and defective component removal process of the coffee mill having the above configuration will be explained.

First, put the coffee beans into the mill case 3,
After each part is set as shown in FIG. 1, the motor 2 is energized and the cutter 4 is rotated at high speed, and the coffee beans are ground by the cutter 4. When grinding begins, the astringent skin 12 and the fruit 13 of the coffee beans shown in FIG. 4 separate, and both become thinner as time passes.

Airflows created by the centrifugal fan effect of the impeller 5 as the cutter 4 rotates occur as shown by arrows P and Q in the figure.

That is, the coffee beans in the grinding process rotate in the chamber B in the same direction as the rotational direction C of the cutter 4 while colliding with the guide 10.

When the extremely light astringent skin 12 and the fine powder of the fruit 13 reach the terminal end E of the guide 10, their direction is changed by the air flow flowing from chamber B to chamber A through the peripheral communication hole 18. , brought into room A. The airflow flowing into the chamber A returns to the chamber B through the central communication hole 17 of the partition plate 8, forming a circulating flow, but the airflow after passing through the peripheral communication hole 18 is decelerated and Annular wall 14 around the communication hole 17
As a result, defective components such as astringent skin accumulate in chamber A without returning to chamber B, so that defective components can be continuously separated and captured in chamber A during operation, that is, while grinding coffee beans.

Even when the large particulate coffee powder required for extracting the coffee liquid reaches the end E of the guide 10, its inertia causes it to continue moving in the same direction as the rotation of the cutter 4, and is carried into the chamber A by the air flow. It is deposited at the bottom of chamber B without being washed away.

After grinding the coffee beans as described above,
The mill lid 7 is removed from the mill case 3 and the particulate coffee powder inside the mill case 3 is taken out and used, while the defective components such as astringent skin and fine powder captured in the chamber B are removed by removing the partition plate 8 from inside the mill lid 7. Just dispose of it.

FIG. 5 shows a cross section of a conventional cutter, and since the inclined surface 16 provided for attaching the blade portion 15 is in the same direction as the bending side of the impeller 5, the inclined surface 16
Due to the fan effect and coffee bean lifting effect, the coffee beans are significantly raised above the cutter as shown by the arrow, and the amount of coffee beans idling in the upper space inside the mill case 3 increases, resulting in a uniform distribution of coffee beans. It was difficult to obtain a fine grind.

Figure 6 shows a cutter showing an embodiment of the present invention.
This is a sectional view taken along line DD in FIG. 1, and since the inclined surface 16 for blade attachment is provided on the opposite side of the bending side of the impeller 5, the blade part 15 crushes the blade. Some of the coffee beans are pushed below the cutter 4 by the effect of the inclined surface 16, and the amount of coffee beans idling in the space above the mill case 3 can be significantly reduced compared to the conventional case. Therefore, the blade part 15
This increases the amount of coffee beans colliding with each other per unit time, making it possible to obtain coffee powder with uniform ground coarseness in a short time.

According to the above configuration, when coffee beans are ground, the astringent skin and fine powder of the coffee beans can be efficiently separated and captured by the air flow generated by the rotation of the cutter 4 into the chamber A serving as a partitioned space, which improves the deliciousness of the coffee. It is possible to remove unnecessary defective components, and because coffee powder with a uniformly ground coarseness can be obtained in a short time, the temperature rise of the coffee powder is suppressed, and therefore the oxidation of the coffee powder is prevented. This can further improve the deliciousness of coffee, and eliminates the difficult and troublesome work of removing defective components from the ground coffee powder and sieving the ground powder to make it evenly grained. It is unnecessary and its simplicity is great.

According to this embodiment, the central communication hole 17 is connected to the chamber B.
On the other hand, since it is configured to open directly above the cutter 4 through the cylinder 9, the centrifugal fan effect of the impeller 5 can be greatly enhanced. In addition, since the shielding guide 11 is provided below the peripheral communication hole 18 of the partition plate 8, immediately after the start of coffee bean grinding,
The coffee particles blown away by the cutter 4 and the impeller 5 do not fly directly into the chamber A, and the air flow from the chamber B to the chamber A through the communication hole 18 can be made smooth. , it is possible to efficiently capture defective components. Furthermore, since the coffee beans in the chamber B are stirred by the guide 10 from the outside toward the center, there is also the effect that the coffee beans are ground uniformly.

As explained above, the present invention uses the centrifugal fan effect of the impeller that rotates together with the cutter when grinding coffee beans to transport defective components such as astringent skin and fine powder in the coffee beans to the space communicating with the internal space of the coffee mill. In the cutter, an inclined surface is formed by a blade on the side opposite to the blade forming side of the cutter, so that it is possible to remove defective components and grind the coffee beans into uniform particles in a short time. This makes it possible to easily obtain coffee powder with uniform ground coarseness from which such defective components have been removed.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing the structure of the coffee mill according to the present invention, Fig. 2 is an exploded perspective view of the same coffee mill, Fig. 3 is a plan view of the partition plate in the above coffee mill, and Fig. 4 is Cross-sectional diagram of coffee beans,
Figure 5 is a cross-sectional view of a conventional cutter, and Figure 6 is a cross-sectional view of a conventional cutter.
It is a sectional view taken along the line DD in the figure. 3... Mill case, 4... Cutter, 5... Impeller, 7... Mill lid, 8... Partition plate, 15... Blade, 16... Inclined surface, A... Chamber (partition space), B
...Chamber (cutter installation space), 17, 18...Communication holes.

Claims (1)

[Scope of utility model registration request] A cutter for grinding coffee beans that is rotationally driven is installed in a mill case, and a blade wheel that rotates together with the cutter to generate an air flow inside the mill case is provided, while capturing defective components of the coffee beans carried by the air flow. What is claimed is: 1. A coffee mill having a space in communication with the space inside the mill case, characterized in that a sloped surface formed by a blade is provided on a surface of the cutter opposite to a side where the impeller is formed.