JPH082335B2 - Coffee making machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a coffee maker having both functions of crushing coffee beans and extracting coffee liquid.

(Prior Art) Conventionally, a general configuration of a coffee maker of this type has a case provided with a crushing body and a filter disposed above a motor, and the crushing body is rotated by the motor to move the inside of the case. The coffee beans were crushed, and then hot water was supplied into the case from the hot water supply mechanism to extract the coffee liquid.

(Problems to be Solved by the Invention) In the above conventional configuration, both crushing and extraction can be performed in the same case, which is advantageous in that it is convenient and easy to use. However, on the other hand, the hot water supplied in the case
Since the coffee powder on the filter penetrates downward into the deposited layer and is filtered by the filter, the residence time of the hot water in the case generally tends to be too long, which causes the coffee powder to taste. There is a drawback that even the components that are damaged (for example, bitterness components) are extracted, and the flavor of the coffee liquid is impaired. Such drawbacks become more remarkable as the amount of coffee powder increases or the particle size becomes finer,
There has been a longing for improvement in this aspect.

The present invention has been made in view of such circumstances,
Therefore, it is an object of the present invention to provide a coffee maker capable of improving the flavor of coffee liquid to be extracted, which has a function of performing grinding to extraction of coffee beans.

[Structure of the Invention] (Means for Solving the Problems) A coffee making machine according to the present invention includes a case that is rotatably provided and has a filter portion for extracting coffee liquid on an outer peripheral portion, and a case that is rotatably provided in the case. The crushed body for crushing the coffee beans, a hot water supply mechanism for supplying hot water into the case at the time of extraction, a motor operated at the time of crushing and extraction, and a rotational force of the motor at the time of crushing is transmitted to the crushed body. Further, at the time of extraction, the rotational force of the motor is transmitted to the case and the case is rotated to allow the hot water to pass through the coffee grounds by the rotational centrifugal force to pass through the coffee grounds from the filtering unit to the filtering unit. And a clutch mechanism for extracting the coffee liquid as coffee liquid.

(Function) When extracting the coffee liquid, first, the coffee beans are housed in the case, the motor is started, the rotational force of the motor is transmitted to the crushed body through the clutch mechanism, and the crushed body is rotated. Let me crush the coffee beans. In the extraction step after the end of crushing, hot water is supplied from the hot water supply mechanism to the coffee powder in the case, and the clutch mechanism transmits the rotational force of the motor to the case to rotate the case. Due to the rotation of the case, a centrifugal force is applied to the hot water supplied into the case, whereby the hot water is allowed to pass through the coffee grounds relatively quickly and is extracted as coffee liquid from the filter portion on the outer peripheral portion of the case.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1
Is a main body case of a coffee making machine, and a cartridge type water storage tank 2 is provided on the left side thereof, and a heating table 4 for mounting a bottle 3 for storing coffee liquid is provided on the lower right side thereof.
Is provided. A heater 5 and a heating pipe 6 are additionally provided on the lower surface side of the heating table 4, and water is supplied from the water storage tank 2 into the heating pipe 6. 7 is a water storage tank 2 and a bottle 3
And a vertical axis type motor arranged between
For example, a commutator motor that rotates at about 10,000 rpm is configured such that its rotation direction is reversible. An inner shaft 10 for driving a pulverized body 9 described later is vertically fixed to an upper end portion of a rotary shaft 8 protruding upward of the motor 7. And
A hollow outer shaft 12 for driving a case 11 described later is rotatably fitted to the outer periphery of the rotary shaft 10 so that the outer shaft 12 can be freely rotated in the main body case 1 via a bearing 13 having a sealing function. Supported by. Reference numeral 14 denotes a clutch mechanism for selectively transmitting the rotational force of the motor 7 to the outer shaft 12, and the lower end large diameter portion 10 of the inner shaft 10.
Coil spring 15 so that it straddles a and the lower part of outer shaft 12.
The coil spring 15 and fix the lower end of the coil spring 15 to the pin 16
Is fixed to the large diameter portion 10a at the lower end of the inner shaft 10. In this case, the clutch mechanism 14 is configured as a friction type one-way clutch, and when the motor 7 is rotating in the forward direction, the coil spring 15 loosens from the outer shaft 12,
Is not transmitted to the outer shaft 12, and only the inner shaft 10 is rotationally driven. On the other hand, when the motor 7 rotates in the reverse direction, the coil spring 15 is wound around the outer shaft 12 by the frictional force, and the both shafts 10 and 12 are integrally driven to rotate.

An outer case 17 is detachably provided on the upper part of the clutch mechanism 14, and a flow-down opening 18 formed at the bottom right end of the outer case 17 faces the upper opening of the bottle 3.
A case 11 for crushing coffee beans and extracting coffee liquid is stored in the outer case 17.
A cylindrical joint 10 formed downward on the bottom of 11 (see FIG. 2)
Is fitted to the connecting portion 12a at the upper end of the outer shaft 12, thereby supporting the case 11. In this case, the tubular joint
Both the inner peripheral surface of 19 and the outer peripheral surface of the connecting portion 12a are formed in a concavo-convex shape, and the engagement between the both prevents rotation of both. Further, a crushing body 9 is rotatably provided in the case 11, and a connecting hole 20 formed under the shaft 20 of the crushing body 9
a is fitted and connected to the upper end of the inner shaft 10. On the other hand, at the top opening of the case 11, a lid 2 having a hot water drop opening 21a in the center is provided.
1 is covered, and between the lid 21 and the upper end of the case 11, for example,
Uniformly form a gap of about 0.2 mm, and then insert the gap into the filtration unit 2
2 Hot water (coffee liquid) toward this filtering unit 22
The inner peripheral surface of the case 11 is formed in a tapered surface shape whose upper side expands so as to be lifted by the rotational centrifugal force. In this case, the lid 21 is fixed by engaging the engaging claw 23 formed on the lid 21 with the bayonet engaging groove 24 formed on the upper end of the case 11. Further, the upper surface opening of the outer case 17 is also covered with a lid 25 having a hot water drop opening 25a in the center. Above the lid 25, a hot water supply arm 26 communicating with the heating pipe 6 is provided so as to be horizontally rotatable so that the hot water outlet 26a of the hot water supply arm 26 can be positioned right above the hot water drop opening 25a of the lid 25. ing. The hot water supply arm 26, the heating pipe 6 and the heater 5 constitute a hot water supply mechanism 27. Reference numeral 28 denotes a lid provided on the upper surface of the main body case 1.

Next, the electric circuit configuration will be described with reference to FIG. A power switch 29 is provided on a front operation panel (not shown) of the main body case 1. Reference numeral 30 denotes a mill timer circuit for setting the crushing time of coffee beans, which energizes the relay driving coil 31 during the time counting operation and disconnects the relay driving coil 31 after the time counting operation is completed. While the relay drive coil 31 is energized (crushing operation), the switch 32 of the heater 5 is turned off,
When the heater 5 is cut off and the relay drive coil 31 is cut off, the switch 32 is returned to the on state to allow the heater 5 to be energized. Reference numeral 33 is a thermostat connected in series with the heater 5, which is turned off when the heater 5 is in a heating state to disconnect the heater 5. On the other hand, 34 is a motor switch for automatically stopping the motor 7. In order to drive the motor switch, a normally closed thermostat 36 and a relay drive coil are used.
When 37 is provided in series and the relay drive coil 37 is energized, the motor switch 34 is turned on.
In this case, the thermostat 36 is attached to the heating table 4, and when the temperature around the coater 5 suddenly rises after the supply of water into the heating pipe 6 is finished, the thermostat 36 is turned off,
The relay drive coil 37 is cut off, whereby the motor switch 34 is returned to the off state and the motor 7 is stopped. On the other hand, in order to reverse the rotation direction of the motor 7, the field coil 38 and the armature coil 39 are provided with a 2
One changeover switch 40, 41 is provided, and the changeover operation of both changeover switches 40, 41 is performed by the relay drive coil 31 described above. In this case, during the crushing operation (when the relay drive coil 31 is energized), the movable contact 40a of the one changeover switch 40 contacts the fixed contact 40b, and the movable contact 41a of the other changeover switch 41 changes to the fixed contact 41b. The motor 7 is contacted to rotate the motor 7 forward. During the extraction operation (when the relay drive coil 31 is cut off), the movable contact 40a of the one changeover switch 40 is switched to the fixed contact 40c side, and the movable contact 41a of the other changeover switch 41 is fixed contact 41c. To form a reverse rotation circuit and rotate the motor 7 in reverse.

Next, the operation of the above configuration will be described. In the procedure for extracting the coffee liquid, first, water is supplied into the water storage tank, coffee beans are stored in the case 11, and the state is set as shown in FIG. Next, when the power switch 29 is turned on, the relay drive coil 37 is energized, the motor switch 34 is turned on, and the motor 7 rotates forward. By the normal rotation of the motor 7, the crushing body 9 is rotated and the coffee beans in the case 11 are crushed. During this crushing operation, since the rotation direction of the motor 7 is the loosening direction for the coil spring 15 of the clutch mechanism 14, the coil spring 15 loosens from the outer peripheral surface of the outer shaft 12, and the rotational force of the motor 7 is applied to the outer shaft 12. Is not transmitted, and the case 11 remains almost stopped.

After performing such a crushing operation for a set time (for example, 30 to 40 seconds), the clock operation of the mill timer circuit 30 ends and the relay drive coil 31 is cut off. by this,
The switch 32 of the heater 5 is turned on to start energizing the heater 5, and at the same time, the changeover switches 40 and 41 are changed over to form a reverse rotation circuit, so that the motor 7 is rotated reversely. Since this rotation direction is the winding tightening direction for the coil spring 15 of the clutch mechanism 14, the coil spring 15 is
By being wound around the outer peripheral surface of 12, the rotational force of the motor 7 is also transmitted to the outer shaft 12. Therefore, both the inner and outer shafts 10 and 12 rotate integrally, and the case 11 rotates integrally with the crushing body 9 at high speed. On the other hand, by energizing the heater 5 described above, the water supplied from the water storage tank 2 into the heating pipe 6 is heated and sequentially turned into hot water, and the hot water is sequentially pushed up to the hot water supply arm 26 by the boiling pressure, and the hot water is heated. From the outlet 26a, the hot water outlets 25a of both lids 25, 21
Hot water is supplied into case 11 through 21a. In this case, since the case 11 rotates at a high speed integrally with the crushed body 9, the rotating centrifugal force causes the coffee powder A to stick to the inner wall of the case 11 as shown in FIG. As a result, the central portion becomes hollow, and the hot water drops into the hollow portion and is received by the crushed body 9 and the inner bottom surface of the case 11. Then, the hot water received on the crushed body 9 is rotated by the crushed body 9,
It is scattered around so as to be shaken off in the centrifugal direction, and penetrates into the coffee grounds A from the inner peripheral side thereof. The hot air received by the inner bottom surface of the case 11 penetrates into the coffee powder A along the inner bottom surface due to the centrifugal force caused by the rotation of the case 11. In this way, the hot water that has penetrated into the coffee grounds A passes through the coffee grounds A relatively quickly by the rotating centrifugal force while reaching the inner wall of the case 11, while extracting the extract from the coffee grounds A. Ascends along the tapered surface of the inner side wall, scatters around from the slight gap between the upper end of the case 11 and the lid 21, that is, the filtering section 22, and is received by the inner side wall of the outer case 17. At this time, the coffee powder A is filtered in the filtering unit 22 and only the coffee liquid is extracted. Then, the coffee liquid received on the inner wall of the outer case 17 flows downward along the inner wall, and finally flows down.
It is dripped into the bottle 3 from 18 and stored.

When all the water in the water storage tank 2 is completely heated in the heating pipe 6, the temperature of the heater 5 and the heating pipe 6 rapidly rises, the thermostat 36 is turned off, and the relay drive coil 37 is cut off. As a result, the motor switch 34 is turned off, the motor 7 is stopped, and the extraction process ends. After that, depending on the temperature of the coffee liquid in the bottle 3 (temperature of the heating table 4),
The thermostat 33 repeats the opening / closing operation to intermittently energize the heater 5 to keep the coffee liquid in the bottle 3 warm.

According to the above-described embodiment, since the rotational force of the motor 7 is selectively transmitted to the crushing body 9 and the case 11 by the clutch mechanism 14, the crushing body 9 is rotated in the case 11 to crush the coffee. Of course, beans can be crushed,
At the time of extraction, by rotating the case 11 integrally with the pulverized body 9 at a high speed, the hot water can be passed through the coffee grounds A relatively quickly by the centrifugal force to extract the coffee liquid. In such a centrifugal extraction method, even if the particle size of the coffee grounds A becomes finer or the amount thereof increases, the hot water residence time in the case 11 becomes shorter than in the conventional case.
It is not necessary to extract only the originally highly scented component from the coffee powder A and the component that impairs the flavor, and the flavor of the coffee liquid can be stably improved regardless of the particle size and amount of the coffee powder A.

Moreover, since crushing to extraction can be performed in one case and the crushing body 9 and the case 1 can be selectively rotated by one motor 7, the configuration is simple and compact, For example, it can be easily used as a coffee machine for home use.

In the above embodiment, since the clutch mechanism 14 is configured as a friction type one clutch, the crushing body 9 and the case 11 can be selectively rotated by reversing the rotation direction of the motor 7, and the clutch The structure of the mechanism 14 is extremely simple, and the cost can be further reduced. in this case,
On the other hand, as the clutch, other than the one using the coil spring 15 as in the above-mentioned embodiment, for example, another structure such as a sprag type one clutch may be adopted.

However, in the present invention, the clutch mechanism is not limited to the one-way clutch, and for example, an electromagnetic clutch, a conical clutch, a disc clutch or the like may be adopted, and the clutch may be switched before and after coffee liquid extraction. In this case, it is not necessary to reverse the rotation direction of the motor.

Further, in the above-mentioned embodiment, the slight gap formed between the upper end of the case 11 and the lid 21 is used as the filtering portion 22, but, for example, a large number of fine holes are formed on the entire circumference of the side wall of the case 11 to filter it. Good as a department.

In addition, according to the present invention, both the inner and outer shafts 10 and 12, the crushed body 9 and the case 1
Various modifications are possible, for example, the connection structure with 1 may be appropriately changed.

[Effects of the Invention] As apparent from the above description, the present invention has a configuration in which the rotational force of the motor is selectively transmitted to the crushing body and the case by the clutch mechanism. Not only can the coffee beans be ground by doing so, but at the time of extraction, by rotating the case integrally with the grinding body, the hot water can be passed through the coffee grounds relatively quickly by the centrifugal force to extract the coffee liquid. Can
As a result, it is not necessary to extract only the originally highly scented component from the coffee grounds and the component that impairs the flavor, and the flavor of the extracted coffee liquid can be stably improved.

Moreover, since the crushing and the extracting can be performed in one case and the crushing body and the case can be selectively rotated by one motor, the configuration can be simplified and the size can be reduced. There is also an advantage that it can be easily used as a coffee making machine for home use, for example.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is an overall vertical sectional front view, FIG. 2 is an enlarged vertical sectional front view of a case portion for explaining the operation at the time of extraction, and FIG. It is an electric circuit diagram which shows a dynamic structure. In the drawings, 1 is a main body case, 2 is a water storage tank, 3 is a bottle, 5 is a heater, 6 is a heating tube, 7 is a motor, 9 is a crushed body, 11 is a case, 14 is a clutch mechanism, 15 is a coil spring, 17 Is an outer case, 22 is a filtering unit, 26 is a hot water supply arm,
27 is a hot water supply mechanism.

Claims (1)

[Claims] 1. A case rotatably provided with a filter portion for extracting coffee liquid on the outer periphery thereof, a crushable body for crushing coffee beans rotatably provided in the case, and a case inside the case at the time of extraction. A hot water supply mechanism that supplies hot water, a motor that is operated during crushing and extraction, a rotational force of the motor is transmitted to the crushing body during crushing, and a rotational force of the motor is transmitted to the case during extraction. A coffee making machine, comprising: a rotating mechanism for rotating the hot water to cause the centrifugal force to pass through the coffee powder to extract the hot water as coffee liquid from the filtering unit.