JP2786644B2 - Coffee extractor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial application field) The present invention relates to a so-called centrifugal extraction type (espresso type) coffee extractor.

(Prior Art) In general, if the contact time between hot water and coffee powder at the time of extraction is shortened, it is not necessary to extract a component (for example, a bitter component) that impairs the flavor from the coffee powder, and the flavor of the coffee liquid can be improved. . In order to realize this, a so-called centrifugal extraction type coffee extractor has recently been considered. This coffee extractor has a motor supported by the extractor body,
A case for extracting coffee liquid is connected to and supported by an upper end portion of an upward rotating shaft of the motor via a coupling, and a filtering section for extracting coffee liquid is provided on an outer peripheral portion of the case. . At the time of extraction, the motor is operated to rotate the case at a high speed, the hot water supplied into the case is quickly passed through the coffee powder in the case by the rotational centrifugal force, and the coffee liquid is filtered from the filtering portion on the outer periphery of the case. Is extracted as In this case, since the case is rotated at a high speed by the motor at the time of extraction, the motor and the case vibrate. When such vibration is transmitted from the member supporting the motor to the extractor main body, the extractor main body vibrates and generates a large noise. Therefore, conventionally, for example, a microfilm disclosed in Japanese Utility Model Application No.
As described in the microfilm of No. 21781, the motor vibration is prevented from being transmitted to the extractor body by attaching the motor to the support member via the cushion member.

(Problems to be Solved by the Invention) However, in the above-described conventional configuration, since the support member of the motor is formed integrally with the main body of the extractor, when the cushion material is deteriorated by using the coffee extractor for a long time, There is a problem that the vibration absorbing performance is reduced and the vibration of the motor is directly transmitted to the extractor main body.

Since the present invention has been made in consideration of such circumstances,
Accordingly, an object of the present invention is to provide a coffee extractor which extracts a coffee liquid by a centrifugal extraction method (espresso method) and can effectively reduce noise.

[Constitution of the Invention] (Means for Solving the Problems) A coffee extractor of the present invention has a case having a filtering part for extracting coffee liquid on an outer peripheral portion, a hot water supply mechanism for supplying hot water into the case, A motor that causes the hot water to pass through the coffee powder in the case by rotating centrifugal force by rotating the case and to extract the coffee as the coffee liquid from the filtration unit, provided in the extractor method body, A support member is provided for supporting the case-side end of the rotating shaft of the motor via a cushion material, and the support member is attached to the extractor main body via a buffer member.

(Operation) At the time of extraction, the case is rotated at a high speed by the motor and vibrates. However, since the cushioning member is interposed between the support member that supports the rotating shaft of the motor via the cushion material and the extractor body, The vibration of the case and the motor is effectively attenuated by the cushioning action of the cushioning member and the cushioning member, and the transmission of the vibration to the extractor body is prevented as much as possible.

(Embodiment) An embodiment in which the present invention is applied to a coffee extractor with a mill function will be described below with reference to the drawings. Reference numeral 1 denotes an extractor main body, and a mounting plate 38 on which a bottle 2 for storing coffee liquid is mounted is provided below the extractor main body. A heater 5 and a heating pipe 6 are attached to a hot platen 4 provided on the lower surface side of the mounting plate 3, and water is supplied into the heating pipe 6 from a water storage tank (not shown). On the other hand, in the extractor body 1, a motor storage chamber 1a is formed on the side of the bottle 2, and a longitudinal motor 7 is stored in the motor storage chamber 1a as described later. . The motor 7 is a commutator motor whose rotation direction is configured to be reversible in the normal and reverse directions. An inner coupling 10 for driving a pulverized body 9, which will be described later, is fixed to the upper end of a rotating shaft 8 that protrudes upward from the motor 7. An outer coupling 12 for driving a case 11, which will be described later, is fitted around the outer periphery of the inner coupling 10 so as to be relatively rotatable. Reference numeral 13 denotes a clutch mechanism for selectively transmitting the rotational force of the motor 7 to the outer coupling 12.
Is a cylindrical base member 14 fitted to the rotating shaft 8 and an outer coupling.
A coil spring 15 is wound so as to straddle the lower part of the coil 12, and the lower end of the coil spring 15 is fixed to the cylindrical base member 14 by a fixing pin 16. In this case, the clutch mechanism 13 is configured as a friction type one-way clutch, and when the motor 7 is rotating forward, the coil spring 15 is loosened from the outer coupling 12 and the rotational force of the motor 7 is transmitted to the outer coupling 12. Not the inner coupling
Only 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 coupling 12 by the frictional force, and the two couplings 10, 12 are integrally driven to rotate.

An outer case 17 is detachably provided above the clutch mechanism 13 as described later.
The extraction nozzle 18 formed at the right end of the bottom of the bottle 2 faces the opening on the upper surface of the bottle 2. And in this outer case 17,
A case 11 for both grinding coffee beans and extracting coffee liquid is stored, and a cylindrical joint 19 formed downward at the bottom of the case 11 is fitted and connected to the outer coupling 12, thereby supporting the case 11. is there. In this case, the tubular joint
The inner peripheral surface of 19 and the outer peripheral surface of the outer coupling 12 are both formed in an uneven shape, and the two are prevented from rotating by meshing with each other. A crushing body 9 is rotatably provided in the case 11, and a support shaft 20 of the crushing body 9 is connected to an inner coupling.
10 is fitted and connected. On the other hand, the upper opening of the case 11 is covered with a dome-shaped lid 21 having a hot water supply port 21a at the center, and a gap of 0.2 mm between the lid 21 and the upper end of the case 11, for example.
Such a gap is formed uniformly, and a space between the corners is used as the filtering section 22. In order to raise the hot water (coffee liquid) toward the filtration unit 22 by the rotational centrifugal force, the inner peripheral surface of the case 11
The upper side is formed in a tapered surface shape expanding. In this case, the fixing of the lid 21 is performed by engaging the engaging claw 23 formed on the lid 21 with a case.
This is performed by engaging a bayonet engaging groove 24 formed on the upper edge of the eleventh portion. Further, a lid 25 having a funnel-shaped hot water supply port 25a at the center is covered on the upper surface opening of the outer case 17, and the hot water supply port 25a of the lid 25 is connected to the hot water supply port 2 of the lower lid 21.
Inserted in 1a. Above the lid 25, a hot water supply arm 26 communicating with the heating pipe 6 is provided so as to be able to turn horizontally, so that the hot water outlet 26a of the hot water supply arm 26 can be located directly above the hot water supply port 25a of the lid 25. I have. 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 extractor main body 1. The structure for receiving the load of the motor 7 and the case 11 is as follows. That is, reference numeral 29 denotes a support member for receiving the load of the motor 7 and the load of the case 11 via the motor 7, and the clutch mechanism 13 is inserted into a through hole 30 formed at the center thereof. A cylindrical portion 31 projects downward from the center of the lower surface of the support member 29, and the upper end of the motor 7 is fitted and supported in the cylindrical portion 31 via a cushion material 32. Such a support member 29
As shown in FIG. 2, screw bosses 33 project downward from, for example, three locations on the outer peripheral lower surface of the motor housing 1a, and are mounted on the upper wall 1b of the motor housing 1a in correspondence with the screw bosses 33. A hole 34 is formed. A stepped cylindrical cushioning member 35 is fitted on the outer periphery of the screw boss 33, and the small diameter portion 35 on the lower side thereof is fitted.
a is inserted into the mounting hole 34 from above, and the lower edge of the large-diameter portion 35b is in contact with the peripheral edge of the mounting hole 34. Such a buffer member
On the outer circumference of the small diameter portion 35a of 35, an annular cushioning member 36
The washer 37 is fastened and fixed to the screw boss 33 with a screw 38 in a state where the washer 37 is addressed to the lower end surfaces of both the buffer members 35 and 36. This prevents the support member 29, the screw boss 33, and the washer 37 from abutting on the upper wall 1b. Further, an engaging projection 40 formed on the inner periphery at the lower end of the outer case 17 is engaged with a bayonet engaging groove 39 formed on the outer periphery of the support member 29, whereby the outer case 17 can be attached to and detached from the support member 29. It is attached to.

On the other hand, the support structure on the lower side of the motor 7 is as follows. That is, as shown in FIG. 1, a mounting plate 42 is fastened and fixed to a mounting boss 41 projecting downward in a motor housing 1a by screws 43, and the mounting plate 42 is fixed to the mounting plate 42 via a cushion material 44. The lower end of the motor 7 is received and supported.

Next, an electric circuit configuration will be described with reference to FIG. A power switch 45 is provided on a front operation panel (not shown) of the extractor main body 1. Reference numeral 46 denotes a timer circuit for a mill for setting the grinding time of the coffee beans. The timer drive circuit energizes the relay drive coil 47 during the timekeeping operation, and turns off the relay drive coil 47 four times after the completion of the timekeeping operation. While the relay drive coil 47 is energized (during the pulverizing operation), the switch 48 of the heater 5 is turned off.
When the heater 5 is turned off and the relay drive coil 47 is turned off, the switch 48 is turned on to allow the heater 5 to be energized. Numeral 49 denotes a thermostat connected in series to the heater 5, which is turned off when the heater 5 is overheated to cut off the power of the heater 5. On the other hand, 50 is a motor switch for automatically stopping the motor 7, and a normally closed thermostat 51 and a relay drive coil are used to drive the motor switch.
When the relay drive coil 52 is energized, the motor switch 50 is turned on.
In this case, the thermostat 51 is attached to the hot platen 4, and when the supply of water into the heating pipe 6 is completed and the temperature around the heater 5 rises sharply, the thermostat 51 is turned off and the relay driving coil 52 is turned off. Is cut off, thereby turning off the motor switch 50 to stop the motor 7. On the other hand, in order to reverse the rotation direction of the motor 7, two changeover switches 55 and 56 are provided in a current path to the field coil 53 and the armature coil 54, and the changeover operation of both changeover switches 55 and 56 is performed as described above. This is performed by the relay driving coil 47 that has been used. In this case, during the pulverizing operation (when the relay drive coil 47 is energized), the movable contact 55a of one of the changeover switches 55 contacts the fixed contact 55b, and the movable contact 56a of the other changeover switch 56 contacts the fixed contact 56b. Motor 7 in contact
Is rotated forward. During the extraction operation (when the relay drive coil 47 is turned off), the movable contact of one of the changeover switches 55
55a is switched to the fixed contact 55c side, and the movable contact 56a of the other changeover switch 56 is switched to the fixed contact 56c to form a reverse rotation circuit and reverse the motor.

Next, the operation of the above configuration will be described. In the procedure for extracting the coffee liquid, first, water is supplied into a water storage tank (not shown), and at the same time, coffee beans are accommodated in the case 11 and set in the state shown in FIG. Then the power switch
When the switch 45 is turned on, the relay drive coil 52 is energized to turn on the motor switch 50, and the motor 7
To rotate forward. The forward rotation of the motor 7 causes the crushed body 9
Is rotated to crush the coffee beans in the case 11. During this grinding operation, the rotation direction of the motor 7 is changed to the clutch mechanism 13.
The coil spring 15 is loosened from the outer peripheral surface of the outer coupling 12 so that the rotational force of the motor 7 is not transmitted to the outer coupling 12 and the case 11 is almost stopped. I do.

After such a pulverizing operation is performed for a set time (for example, 30 to 40 seconds), the clock operation of the mill timer circuit 46 ends, and the relay driving coil 47 is turned off. by this,
The switch 48 of the heater 5 is turned on to start energization of the heater 5, and the two changeover switches 55 and 56 are switched to form a reverse rotation circuit. The motor 7 reversely rotates at, for example, 5000 rpm. Since this rotation direction is the direction of tightening the coil spring 15 of the clutch mechanism 13, the coil spring 15 is wound around the outer peripheral surface of the outer coupling 12, and
The torque of the motor 7 is also transmitted to the outer coupling 12.
Therefore, the inner and outer couplings 10 and 12 rotate integrally, and the case 11 rotates integrally with the crushed body 9 at high speed. On the other hand, when the heater 5 is energized, the water supplied from the water storage tank into the heating pipe 6 is heated and 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 outlet is provided. 26a to hot water inlets 25a, 21a for both lids 25, 21
The hot water is supplied into the case 11 through. In this case, case 11
Is rotated at a high speed integrally with the crushed body 9, and the rotational centrifugal force causes the coffee powder A to stick to the inner side wall of the case 11 as shown in FIG. It becomes a hollow state, and hot water is dropped on the hollow portion and received on the inner bottom surface of the crushed body 9 and the case 11. Then, the hot water received on the crushed body 9 scatters around so as to be shaken in the centrifugal direction by the rotation of the crushed body 9, and permeates into the coffee powder A from the inner peripheral side. Also, the hot water received on the inner bottom surface of the case 11 permeates into the coffee powder A along the inner bottom surface by centrifugal force accompanying the rotation of the case 11. In this way, the hot water permeated into the coffee powder A relatively quickly passes through the coffee powder A by the rotational centrifugal force while extracting the extract from the coffee powder A, reaches the inner wall of the case 11, and Then, it rises along the tapered surface of the inner wall, and scatters around from a slight gap between the upper end of the case 11 and the lid 21, that is, from the filtering portion 22, and is received by the inner wall of the outer case 17. At this time, the filtering unit 22 filters the coffee powder A and extracts only the coffee liquid. And the coffee liquid received on the inner wall of the outer case 17 is
The water flows downward along the inner side wall, and finally drops from the extraction nozzle 18 into the bottle 2 and is stored. In this case, the hot water is passed through the coffee grounds A relatively quickly by the rotational centrifugal force, so that only the original fragrant components are extracted from the coffee grounds A and the components that impair the flavor do not need to be extracted. Flavor improves.

When all the water in the water storage tank is completely heated in the heating pipe 6, the temperatures of the heater 5 and the heating pipe 6 rise rapidly, the thermostat 51 is turned off, and the relay drive coil 52 is turned off. As a result, the motor switch 50 is turned off, the motor 7 is stopped, and the extraction process ends. Since then, bottle 2
The thermostat 49 repeats the opening and closing operation in accordance with the temperature of the coffee liquid in the inside (the temperature of the hot platen 4), and intermittently energizes the heater 5 to keep the coffee liquid in the bottle 2 warm.

By the way, when milling and extracting, the motor 7 and case
11 vibrates. In this case, the extractor main body 1 (upper wall 1b) and the support member 29 that receives the load of the motor 7 and the case 11 by supporting the motor 7 through the cushion material 32, Since the buffer members 35 and 36 are interposed, the vibration is effectively attenuated by the cushioning action of the cushion member 32 and the buffer members 35 and 36, and the transmission of the vibration to the extractor main body 1 is prevented as much as possible. Noise due to vibration is greatly reduced.

In the above embodiment, since the outer case 17 is also mounted on the support member 29, even if the case 11 sways along with the high-speed rotation, the sway is performed via the motor 7 and the support member 29. Thus, the case 11 and the outer case 17 can be rolled integrally, so that even when the case 11 is rolled, misalignment between the case 11 and the outer case 17 can be prevented.
For this reason, even if the gap between the case 11 and the outer case 17 is small, they can be prevented from colliding with each other during high-speed rotation, so that noise can be further reduced and the outer case 17 can be downsized. Can also be achieved.

In the above-described embodiment, the clutch mechanism 13 is configured as a friction type one-way clutch.However, the present invention is not limited to this. For example, an electromagnetic clutch, a conical clutch, a disk clutch, or the like is employed.
The clutch may be switched between before and after coffee liquid extraction. In this case, there is no need to reverse the rotation direction of the motor.

Further, in the above-described embodiment, the small gap formed between the upper end of the case 11 and the lid 21 is used as the filtering portion 22. It may be a part.

In addition, the present invention can be variously modified, for example, it can be applied to a configuration in which the mill function is omitted.

[Effects of the Invention] As is clear from the above description, the present invention is configured so that the case-side end of the rotating shaft of the motor that rotates at a high speed during extraction is supported by a support member via a cushion material, Since the cushioning member is interposed between the support member and the extractor main body, the vibration of the case and the motor can be effectively damped by the cushioning action of the cushioning material and the buffering member, and the vibration transmission to the extractor main body is performed. An excellent effect is obtained in that it can be prevented as much as possible and noise due to vibration can be effectively reduced.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is an overall longitudinal sectional view, FIG. 2 is an enlarged longitudinal sectional view of a main part, and FIG. 3 is an electric circuit diagram showing an electric configuration. . In the drawing, 1 is an extractor body, 2 is a bottle, 5 is a heater, 6
Is a heating tube, 7 is a motor, 9 is a crushed body, 10 is an inner coupling, 11 is a case, 12 is an outer coupling, 13 is a clutch mechanism, 15 is a coil spring, 17 is an outer case, 22 is a filtration unit, 26 Is a hot water supply arm, 27 is a hot water supply mechanism, 29 is a support member, 32
Is a cushion material, 33 is a screw boss, 35 and 36 are cushioning members,
37 is a washer, 38 is a screw, 41 is a mounting boss, and 42 is a mounting plate.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) A47J 31/00

Claims (1)

(57) [Claims] 1. A case containing coffee grounds therein and having a filtering portion for extracting coffee liquid on the outer periphery, a hot water supply mechanism for supplying hot water into the case, and rotating the hot water by rotating the case. A motor for extracting coffee liquid from the filtration unit by passing the coffee grounds through centrifugal force, the coffee extractor being provided in the extractor body, wherein the end of the rotating shaft of the motor on the case side is cushioned. A coffee extractor comprising: a support member for supporting the material via a material; and the support member is attached to the extractor body via a buffer member.