JPH05123261A - Coffee pot - Google Patents

Abstract

PURPOSE:To execute the extraction conforming to a degree of decoction of coffee beans to be pulverized, in the coffee pot which has a coffee bean pulverizing function and executes extraction and warming of a coffee liquid. CONSTITUTION:In a pulverizing chamber 6 in which a pulverizing means 7 for pulverizing coffee beans is installed, a decoction degree detecting means 15 for detecting a degree of detection of coffee beans is provided. An output of the decoction degree detecting means 15 and an output of a water quantity setting means 16 for setting the water quantity of water contained in a water vessel 1 are inputted, and an electric conduction duty ratio to a heating means 3 is calculated by a duty ratio arithmetic means 17. A control means 18 for inputting an output of the starting switch 13 and the duty ratio arithmetic means 17, and controlling a heating control means 12 and a motor control means 9 controls the heating means 3 which is extracting a coffee liquid, based on the duty ratio calculated by the duty ratio arithmetic means 17, and extracts the coffee liquid in an optimal time in accordance with the degree of decoction of coffee beans and the water quantity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coffee brewing machine having a coffee bean crushing function and for extracting and retaining heat of coffee liquid.

[0002]

2. Description of the Related Art In recent years, coffee brewers that crush coffee beans and extract the coffee liquor from the crushed coffee grounds to retain heat have been required to be able to extract more delicious coffee liquor.

Conventionally, this type of coffee brewer has generally been constructed as shown in FIG. The configuration will be described below.

As shown in the figure, a water container 1 is a container for accommodating water and being detachable from the main body, and a water pipe 2 goes out from the bottom of the water container 1 and passes through the inside of a heating means 3 so that the water container 1 The upper part or the extraction chamber 4 for extracting the coffee liquid is connected. The heating means 3 heats the glass container 5 containing the water introduced into the water pipe 2 and the extracted coffee liquid. The crushing chamber 6 is for crushing coffee beans and has a crushing means 7 installed therein, and the crushing means 7 is driven by a motor 8. The motor control means 9 controls the energization of the motor 8.
The porous filter 10 passes the powder of the coffee beans crushed by the crushing means 7 having a predetermined size or smaller, and sends the coffee beans to the extraction chamber 4. The water channel switching valve 11 switches the water channel for sending the water heated by the heating means 3 to the water container 1 or the extraction chamber 4. The heating control means 12 controls the energization of the heating means 3. The start switch 13 is a switch for instructing the start of the coffee liquid extraction operation of the main body, and the control means 14 receives the output of the start switch 13 as input and controls the operation patterns of the heating means 3 and the motor 8.

To explain the operation in the above configuration, when the start switch 13 is operated, the motor control means 9 starts energizing the motor 8 by the output from the control means 14,
The coffee beans are crushed for a predetermined time and accumulated in the extraction chamber 4 through the porous filter 10. When the crushing of the coffee beans is completed, the heating control means 12 starts to energize the heating means 3 by the output of the control means 14 and the water in the water pipe 2 is heated. In the extraction chamber 4, the water pipe 2
The water heated by the heating means 3 is dripped through and the coffee liquid is extracted. The extracted coffee liquid was housed in the glass container 5 and kept warm by the heating means 3.

[0006]

In such a conventional coffee brewing machine, when the coffee liquid is extracted, the heating means 3 is continuously energized, and the extraction according to the roasting degree of the coffee beans to be ground is performed. Since the time cannot be controlled, there is a problem that it is difficult to extract the coffee liquid that is characteristic of coffee beans.

The present invention solves the above-mentioned problems, and its first object is to enable extraction according to the degree of roasting of coffee beans to be ground. A second object is to obtain roasting degree detecting means for detecting the roasting degree of coffee beans with a simple configuration when crushing coffee beans. Further, a third object is to enable the extraction of the coffee liquid even when the coffee liquid is only extracted using the coffee powder without crushing the coffee beans.

[0008]

In order to achieve the above first object, the present invention comprises a water container for containing water, and a heating means for heating water introduced from the water container to supply hot water. A heating control means for controlling energization to the heating means, a crushing means for crushing coffee beans, a motor for driving the crushing means, a motor control means for controlling energization of the motor, and the crushing means are provided. A crushing chamber, a porous filter that discharges coffee powder crushed to a size smaller than a predetermined size by the crushing unit, and hot coffee supplied by accumulating the coffee powder discharged from the crushing chamber. Extraction chamber for extracting liquid, start switch for instructing start of coffee liquid extraction operation, water amount setting means for setting the amount of water contained in the water container, and coffee contained in the grinding chamber. Roasting degree detecting means for detecting the roasting degree, and a duty ratio calculating means for calculating an energization duty ratio to the heating means by inputting the output of the roasting degree detecting means and the output of the water amount setting means, A start switch and a control means for controlling the heating control means and the motor control means using the outputs of the duty ratio calculation means as inputs;
The control means controls the heating means during coffee liquid extraction based on the duty ratio calculated by the duty ratio calculation means based on the outputs of the roasting degree detection means and the water amount setting means. It is used as a means for solving problems.

In order to achieve the second object,
The roasting degree detecting means of the first problem solving means includes a piezoelectric element attached to the outer wall of the crushing chamber, an amplifying section that receives the output of the piezoelectric element as an input, and a rectifying section that rectifies the amplified signal. The second problem solving means is that the crushing means detects the sound and vibration when crushing coffee beans in the crushing chamber and detects the roasting degree of the stored coffee beans based on the output level. I am trying.

Further, in order to achieve the third object, the control means of the first problem solving means causes the motor control means to start crushing when the coffee liquid extracting operation is instructed by the start switch. When the output voltage of the roasting degree detection means after a lapse of a predetermined time from is less than the predetermined voltage, the crushing of the coffee beans is stopped, and the duty ratio calculated by the duty ratio calculation means based on the water amount set by the water amount setting means. The third is that the heating means is controlled by
Is used as a means for solving the problem.

[0011]

According to the present invention, the roasting degree of coffee beans to be ground can be detected by the above-mentioned first solving means, and the duty ratio calculating means determines the energizing duty to the heating means from the roasting degree and the set water amount. The ratio can be obtained and controlled, and the coffee liquid can be extracted in the optimum extraction time for the roasting degree and the amount of water.

Further, the second solving means makes it possible to detect the degree of roasting with a simple structure using a piezoelectric element as the means for detecting roasting degree.

Further, according to the third solving means, the coffee liquid can be extracted without crushing the coffee beans, and the coffee can be extracted even when the roasting degree cannot be detected.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the first problem solving means will be described below with reference to FIG. The same components as those in the conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, the roasting degree detecting means 15 detects the roasting degree of the coffee beans contained in the crushing chamber 6. The water amount setting means 16 sets the amount of water contained in the water container 1. Duty ratio calculation means 17
Receives the output of the roasting degree detecting means 15 and the output of the water amount setting means 16 and calculates the energizing duty ratio τ of the heating means 3 such that the extraction time of the coffee liquid is optimum. The control means 18 receives the outputs of the start switch 13 and the duty ratio calculation means 17, and controls the heating control means 12 and the motor control means 9. The energization duty ratio obtained by the duty ratio calculation means 17 at the time of coffee liquid extraction. The heating control means 12 is controlled so that the heating means 3 is energized with τ.

In the above structure, the operation will be described according to the procedure of the flow chart shown in FIG. 2. First, when the start switch 13 is operated in step 101, the motor control means 9 energizes the motor 8 in step 102 and the coffee beans Crushing is started and the process proceeds to step 103. In step 103, the roasting degree of the coffee beans stored in the crushing chamber 6 is detected by the roasting degree detecting means 15 when crushing the coffee beans, and the process proceeds to step 104. In step 104, the energization duty ratio τ required for optimizing the extraction time is calculated from the roasting degree of the coffee beans obtained in step 103 and the water amount set by the water amount setting means 16. In step 105, the heating means 3 is energized with the energization duty ratio τ calculated in step 104, and the extraction is completed in step 106. As a result, the coffee liquid can be extracted in an optimum time according to the degree of roasting of coffee beans and the amount of water used.

Next, an embodiment of the second problem solving means will be described with reference to FIG. The same components as those of the first embodiment for solving the problems are designated by the same reference numerals, and the description thereof will be omitted.

As shown in the figure, the roasting degree detecting means 15 converts the vibration during coffee bean crushing into an electric signal by the piezoelectric element 19 attached to the outer wall of the crushing chamber 6, and amplifies the output by the amplifying section 20. The roasting degree is detected by the level of the output signal by rectifying the amplified signal by the rectifying unit 21. FIG. 4 is a circuit diagram of the present embodiment, in which a piezoelectric buzzer is used as the piezoelectric element 19, and an amplifier 20 is used.
Is composed of an operational amplifier, a resistor and a capacitor. The rectifier is composed of a resistor, a capacitor and a diode, and the output waveform is determined by the time constant of the resistor and the capacitor. FIG. 5 is a diagram showing an output waveform of the roasting degree detecting means 15 composed of the circuit of FIG. 4, in which the horizontal axis shows the elapsed time from the start of crushing and the vertical axis shows the output voltage level. , When comparing hard beans (shallow roasted beans) and soft beans (deep roasted beans), the shallower the roast, the higher the output level. As a result, the roasting degree can be detected by averaging the output levels of the roasting degree detecting means 15 for a certain period of time.

Next, an embodiment of the third problem solving means will be described. The control means 18 in FIG.
3 when the coffee liquid extracting operation is instructed, when the output voltage of the roasting degree detecting means 15 after the elapse of a predetermined time from the start of the grinding by the motor control means 9 is smaller than the predetermined voltage, the coffee beans are ground. And the duty ratio calculation means 1 based on the water amount set by the water amount setting means 16.
The heating means 3 is controlled by the duty ratio calculated by 7. The other structure is the same as that of the above embodiment.

The operation of the above configuration will be described according to the procedure of the flowchart shown in FIG.
When the start switch 13 is operated in step 1, the motor control means 9 energizes the motor 8 in step 202 to start crushing coffee beans and the process proceeds to step 203. In step 203, the output voltage V1 of the roasting degree detecting means 15 after a predetermined time (1 second in the present embodiment) from the start of crushing is detected, and the process proceeds to step 204. Step two
In 04, the output voltage V1 detected in step 203 is compared with a predetermined voltage level Vr. If V1 ≦ Vr, the process proceeds to step 205, and if V1> Vr, step 2
Proceed to 07. In step 205, the power supply to the motor 8 is stopped, the crushing of the coffee beans is completed, and the routine proceeds to step 206. In step 206, the energization duty ratio τ1 is calculated by the duty ratio calculation means 17 from only the water quantity set by the water quantity setting means 16, and the routine proceeds to step 210. On the other hand, in step 207, the degree of roasting is detected at the time of crushing the coffee beans, and the process proceeds to step 208. In step 208, the power supply to the motor 8 is stopped and the crushing of the coffee beans is completed. In step 209, the energizing duty ratio τ 2 is calculated by the duty ratio calculating means 17 from the roasting degree of the coffee beans obtained in step 207 and the water quantity set by the water quantity setting means 16.
Is calculated and the process proceeds to step 210. Step 210
Then, the heating means 3 is energized at the energization duty ratio τ1 or τ2 obtained in step 206 or step 209 to extract the coffee liquid. As a result, even when the coffee liquid is extracted from the ground by using the ground coffee powder, the coffee liquid can be extracted in an optimum extraction time according to the amount of water.

[0021]

As is apparent from the above description of the embodiments, according to the present invention, a water container for containing water, a heating means for heating water introduced from the water container to supply hot water, and Heating control means for controlling energization to the heating means, crushing means for crushing coffee beans, a motor for driving the crushing means, and motor control means for controlling energization of the motor,
A crushing chamber in which the crushing unit is installed, a porous filter which discharges coffee powder crushed to a predetermined size or less by the crushing unit, and the coffee powder discharged from the crushing chamber are accumulated. An extraction chamber for extracting the coffee liquid with the supplied hot water, a start switch for instructing the start of the extraction operation of the coffee liquid, a water amount setting means for setting the water amount of the water contained in the water container, and the grinding chamber. A roasting degree detecting means for detecting the roasting degree of the coffee beans housed in, and a duty for calculating an energization duty ratio to the heating means by inputting the output of the roasting degree detecting means and the output of the water amount setting means. The control means is provided with a ratio calculation means and a control means for controlling the heating control means and the motor control means with the outputs of the start switch and the duty ratio calculation means as inputs. Since the heating means during coffee liquid extraction is controlled based on the duty ratio calculated by the duty ratio calculating means by the outputs of the degree detecting means and the water amount setting means, the roasting of the coffee beans contained in the crushing chamber is performed. The roasting degree can be detected by the roasting degree detecting means during bean crushing, and from this roasting degree and the water amount set by the water amount setting means, by calculating and controlling the duty ratio to the heating means by the duty ratio calculating means, The coffee liquid can be extracted in an optimum time according to the degree of roasting of coffee beans and the amount of water.

The roasting degree detecting means comprises a piezoelectric element attached to the outer wall of the crushing chamber, an amplifying section for receiving the output of the piezoelectric element as an input, and a rectifying section for rectifying the amplified signal. By detecting the sound and vibration when the coffee beans are crushed in the crushing chamber by the means, and detecting the roasting degree of the stored coffee beans by the output level, a piezoelectric element is attached to the outer wall of the crushing chamber. By amplifying and rectifying the vibration when the coffee beans are ground, the roasting degree detecting means can be configured with a simple configuration.

Further, the control means, when the coffee liquid extraction operation is instructed by the start switch, the output voltage of the roasting degree detection means after a lapse of a predetermined time from the start of the crushing by the motor control means is a predetermined voltage. When it is smaller than the above, the crushing of the coffee beans is stopped, and the heating means is controlled by the duty ratio calculated by the duty ratio calculation means based on the water amount set by the water amount setting means, so that extraction is performed using coffee grounds. Even when the roasting degree cannot be detected because the coffee beans are not crushed, the coffee liquid can be extracted by calculating the duty ratio from the set water amount.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a coffee brewer according to an embodiment of the present invention.

FIG. 2 is an operation flowchart of the coffee brewer.

FIG. 3 is a block diagram of roasting degree detecting means of a coffee brewer according to another embodiment of the present invention.

FIG. 4 is a circuit diagram of the roasting degree detecting means.

FIG. 5 is an output waveform diagram of the roasting degree detecting means.

FIG. 6 is an operation flowchart of a coffee brewer according to another embodiment of the present invention.

FIG. 7: System configuration diagram of a conventional coffee brewer

[Explanation of symbols]

 1 Water Container 3 Heating Means 4 Extraction Chamber 6 Crushing Chamber 7 Crushing Means 8 Motor 9 Motor Controlling Means 10 Porous Filter 12 Heating Control Means 13 Start Switch 15 Roasting Degree Detecting Means 16 Water Volume Setting Means 17 Duty Ratio Calculating Means 18 Control means

Claims (3)

[Claims] 1. A water container for containing water, a heating means for heating water introduced from the water container to supply hot water, a heating control means for controlling energization of the heating means, and crushing coffee beans. Crushing means, a motor for driving the crushing means, a motor control means for controlling the energization of the motor, a crushing chamber in which the crushing means is provided, and the crushing means crushes the particles to a predetermined size or less. A porous filter for discharging coffee powder, an extraction chamber for extracting coffee liquid by hot water supplied by accumulating the coffee powder discharged from the crushing chamber, and an instruction to start the coffee liquid extraction operation A start switch, a water amount setting means for setting the water amount of the water contained in the water container, a roasting degree detecting means for detecting the roasting degree of the coffee beans contained in the crushing chamber,
The input of the output of the roasting degree detecting means and the output of the water amount setting means, the duty ratio calculating means for calculating the energizing duty ratio to the heating means, and the heating by inputting the outputs of the start switch and the duty ratio calculating means Control means for controlling the control means and the motor control means, the control means extracting coffee liquid based on the duty ratio calculated by the duty ratio calculation means by the outputs of the roasting degree detection means and the water amount setting means. A coffee brewer adapted to control the heating means therein. 2. The roasting degree detecting means comprises a piezoelectric element attached to the outer wall of the crushing chamber, an amplifying section that receives the output of the piezoelectric element as an input, and a rectifying section that rectifies the amplified signal. The coffee brewing machine according to claim 1, wherein the means detects the sound and vibration when the coffee beans are crushed in the crushing chamber, and the roasting degree of the stored coffee beans is detected by the output level. 3. The output voltage of the roasting degree detecting means after the elapse of a predetermined time from the start of crushing by the motor control means, when the coffee liquid extracting operation is instructed by the start switch, the control means outputs a predetermined voltage. The coffee brewing machine according to claim 1, wherein the crushing of the coffee beans is stopped when the value is smaller than the above value, and the heating means is controlled by the duty ratio calculated by the duty ratio calculating means based on the water amount set by the water amount setting means.