JPS61112295A - Regular coffee extractor - 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] [Technical field to which the invention pertains]

The present invention relates to a regular coffee extraction device for a coffee vending machine that uses regular coffee powder as a raw material and adds hot water to it to extract coffee.

[Prior art and its problems]

As a coffee extractor that is incorporated into the coffee vending machine mentioned above, hot water is added to a predetermined amount of regular coffee powder to swell the coffee powder, which is then pressurized to extract and filter coffee through a filter. Pressurized extraction methods are widely used. Next, in Fig. 5, which shows a diagram of the conventional configuration principle of the coffee extractor of the above type, l is the pressurizing piston 2.
It is an open-bottom cylinder with a built-in pressurizing piston 2.
is raised and lowered in the direction of the arrow in synchronization with the coffee extraction operation by a driving unit (not shown) via the operating rod 3. Further, the cylinder 1 has a hot water supply port 4 and a coffee powder inlet 5 opened from the upper side to the side, and coffee is supplied from a hot water tank (not shown), a coffee mill, or a coffee powder material box (not shown) based on a coffee sales instruction. A predetermined amount of raw material is put into the cylinder. Note that 2a is a sealing member attached to the outer periphery of the pressurizing piston 2. On the other hand, a filter block 6 is arranged below the open lower end surface of the cylinder l. This filter block 6 consists of a dish-shaped base 8 with a coffee spewing lower opening at the center bottom, and a filter 9 installed on the top surface of the base 8. The coffee extraction operation with the above configuration is performed as follows. In the sales standby state, the cylinder 1 and the filter block 6 overlap, and the pressurizing piston 2 has retreated to the raised position shown by the line 11 inside the cylinder. When a vending command is given to the vending machine from this standby state, coffee powder and hot water for one cup of coffee are dispensed into the coffee powder inlet 5. The hot water is supplied into the cylinder 1 through the hot water supply port 4. Then, the piston 2 begins to descend from the standby position toward the solid line position, pressurizing the powder and coffee powder introduced into the cylinder. This causes the coffee powder to absorb hot water and swell.
Coffee is extracted and filtered to the base side through the filter 9 by pressurization of the piston, and from there, the beverage cup 10 is carried out to the bending stage of the vending machine through the discharge lower.
injected into. Note that the coffee grounds remaining on the upper surface of the filter 9 are scraped off laterally by a scraper (not shown) after the cylinder 1 and the filter block 6 are temporarily separated from each other. By the way, the most important point in terms of performance evaluation of this type of piston pressurized coffee brewing device is the coffee extraction rate. In preparing coffee, a major challenge faced by this type of coffee extraction device is how to increase the coffee extraction rate. In this respect, the conventional configuration described in FIG.
・Coffee powder and hot water placed in the °5 cylinder are only in contact with each other in a stagnant state, making it difficult to extract enough coffee within a limited short time.
In this respect, it is sufficient to allow sufficient time for the coffee powder to contact the hot water, but this method has the disadvantage that it takes a long time for one sales operation, which increases the customer's waiting time.

[Purpose of the invention] This invention was developed in consideration of the above points, and by skillfully stirring and mixing coffee powder and hot water in a cylinder during the coffee extraction process, it is possible to prepare rich coffee within a limited and short selling operation time. It is an object of the present invention to provide a coffee extraction device having a high coffee extraction rate. [Key points of the invention]

In order to achieve the above object, the present invention is equipped with a pressure reducing means for reducing the pressure inside the cylinder, and after the coffee ingredients are introduced into the cylinder, the inside of the cylinder is temporarily reduced by operating the pressure reducing means as a preliminary step to pressurizing the piston. By reducing the pressure, hot water is boiled at low pressure within the cylinder to promote stirring and mixing of raw materials, thereby improving the coffee extraction rate.

[Embodiments of the invention]

1 to 4 show a coffee extraction device according to an embodiment of the present invention in the order of coffee extraction operation, and the same members as in FIG. 5 are given the same reference numerals. That is, the difference from the conventional configuration shown in FIG. 5 is that the piston 2 is equipped with a new pressure reducing means, which is composed of an auxiliary cylinder indicated by the reference numeral 11, and a pressure reducing piston 12 that is stroked in the direction of arrow B within the auxiliary cylinder 11. This is an additional point. Here, the auxiliary cylinder 11 is configured to extend upward from the center integrally with the pressurizing piston 2, and the depressurizing piston 12 installed within the auxiliary cylinder 11 is partially pressurized during the coffee extraction process. It is linked to a drive mechanism (not shown) so as to move differently from the pressure piston 2. Next, the coffee extraction operation with the above configuration will be explained. First, in the sales standby state, the pressurizing piston 2) and the depressurizing piston 12 are in a retreat position as shown in FIG.
When a sales command is given in this state, a predetermined amount of coffee powder and hot water are supplied into the cylinder l.Then, as shown in FIG. It descends to a position past mouth 4 and stops once. In this state, the inner space of the cylinder 1 and the hot water supply port 4 are separated by the piston 2. When the communication with the powder inlet 5 is cut off, the pressurizing piston 2 remains stopped at that position and only the depressurizing piston 12 is operated to move upward in the auxiliary cylinder 11 as shown in FIG. Pull up. The internal space of the cylinder 1 is depressurized by this lifting operation of the decompression piston 12, and along with this depressurization, the cylinder l
The water remaining inside is boiled at low pressure. Therefore, as shown in FIG. 3, the hot water bubbles violently in the cylinder 1, and the hot water and coffee powder are stirred and mixed. In this case, as the pressure inside the cylinder is reduced, a small amount of air is sucked in through the filter 9 on the lower surface, so a stirring effect due to the air bubbles can also be expected. In this way, the coffee powder and the hot water are actively stirred and mixed by the low-pressure boiling of the hot water within the cylinder, thereby promoting coffee extraction. When the predetermined low-pressure boiling time has elapsed, the decompression piston 12 descends again to its original position in the auxiliary cylinder 11, and from there it moves to the cylinder 1 together with the pressurizing piston 2 as shown in FIG. The material is pressurized by being lowered inside. As a result, the thick coffee liquid passes through the filter 9 and drips onto the filter block side.
The coffee flows out through the spitting loa. In the above embodiment, the pressure reducing means inside the cylinder is a double piston type in which the pressure reducing piston 12 is combined with the pressure applying piston 2, but a vacuum pump is combined instead of this pressure reducing piston to reduce the pressure inside the cylinder. It can also be configured to reduce the pressure.

【Effect of the invention】

υAs mentioned above, according to this invention, the cylinders □, □, □. picture,. -5-Yu. . After pouring, as a step before pressurizing the piston, the pressure inside the cylinder is temporarily reduced by operating the pressure reducing means, and the water is boiled at low pressure in the cylinder to stir and mix the raw materials. During the boiling process, the coffee powder and hot water in the cylinder are actively stirred and mixed to promote coffee extraction, thereby increasing the coffee extraction rate and producing rich and delicious coffee within a limited short sales operation time. can be prepared.

[Brief explanation of drawings]

1 to 4 are operational explanatory diagrams showing the configuration of an embodiment of the present invention and each step of its coffee extraction operation in order, respectively, and FIG. 5 is a configuration diagram of a conventional coffee extraction device. In, 1 cylinder, 2: pressurizing piston, 4+ hot water supply port, 5: coffee powder inlet, 6: filter block, 9: filter, 11: auxiliary cylinder of pressure reducing means, 12: pressure reducing piston. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1) A cylinder equipped with a pressurizing piston is arranged on a filter block equipped with a filter on the upper surface, and the piston is pressurized with regular coffee powder and hot water put into the cylinder. A regular coffee brewing device that extracts and filters coffee through a filter by operating the device, is equipped with a pressure reducing means for reducing the pressure inside the cylinder, and is operated by operating the pressure reducing means as a preliminary step to pressurizing the piston after inputting coffee raw materials. A regular coffee extraction device characterized by temporarily reducing the pressure inside the cylinder, boiling water at low pressure within the cylinder, and stirring and mixing raw materials. 2) In the coffee brewing device according to claim 1, the pressure reducing means is composed of an auxiliary cylinder configured as a part of the pressurizing piston, and a pressure reducing piston that is stroke operated within the auxiliary cylinder. A regular coffee extraction device characterized by being