JP3082118B2 - Coffee kettle - Google Patents

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 for extracting a coffee liquid and keeping the temperature of the coffee liquor.

[0002]

2. Description of the Related Art In recent years, there has been a demand for a coffee boiler that pulverizes coffee beans, extracts a coffee liquid from the pulverized coffee powder, and keeps the temperature warm so that a more delicious coffee liquid can be extracted.

[0003] For this purpose, Japanese Patent Application Laid-Open No. 63-111823 discloses that after the hot water temperature of a water tank reaches a predetermined temperature, the water tank is switched to an extraction chamber and extraction is performed at a predetermined temperature.

Conventionally, this kind of coffee brewer is shown in FIG.
The configuration shown in FIG. Hereinafter, the configuration will be described.

[0005] As shown in FIG. 12, the coffee brewer has a water container 1 containing water and detachable from a main body. The water container 1 passes from the bottom of the water container 1 to the inside of a heating means 3 by a water pipe 2. Or in the coffee liquid extraction chamber 4. 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 means 7 provided in the crushing chamber 6 for crushing coffee beans is driven by a motor 8, and the motor control means 9 comprises a motor 8.
Control of power supply to The coffee beans pulverized by the pulverizing means 7 are sent to the extraction chamber 4 through a porous filter 10 through which a powder having a predetermined size or less passes. The water path switching valve 11 switches the water path for sending the water heated by the heating means 3 to the water container 1 or the extraction chamber 4, and 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 operation of the main body, and the control means 14 controls the operation pattern of the heating means 3 and the motor 8 by using the output of the start switch 13 as an input. When the start switch 13 is operated, the control means 14
In response to the output from the motor control means 9, the motor control means 9 starts energizing the motor 8, the coffee beans are crushed for a predetermined time, and the coffee beans are accumulated in the extraction chamber 4 through the porous filter 10. When the grinding of the coffee beans is completed, the heating control means 12 starts supplying electricity to the heating means 3 by the output of the control means 14, and the water in the water pipe 2 is heated. When the temperature of the water contained in the water container 1 is lower than a predetermined temperature, the switching valve 11 switches the water channel to the water container 1 side to perform an environment of the heated water. Is switched to the extraction chamber 4 side. In the extraction chamber 4, the water heated by the heating means 3 is dropped onto the stored coffee powder through the water pipe 2 to extract the coffee liquid. The extracted coffee liquid was accommodated in a glass container 5 and kept warm by the heating means 3.

[0006]

In such a conventional coffee boiler, the energizing duty ratio can be changed depending on a course selected when extracting coffee liquid. However, when the extraction is performed with a small energizing duty ratio, There was a problem that the temperature at the time of extracting the coffee liquid was lowered.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and has an object to increase the temperature of coffee liquid at the end of extraction when coffee liquid is extracted with a smaller energization duty ratio by a selected course. .

[0008]

In order to achieve the above object, the present invention provides, as a first means for solving the problems, a water container for containing water, and a heater for supplying water by heating water introduced from the water container. Heating means, heating control means for controlling the power supply to the heating means, crushing means for crushing the coffee beans, a motor for driving the crushing means, a motor control means for controlling the power supply to the motor, A crushing chamber in which crushing means is provided, an extraction chamber for extracting coffee liquid by hot water supplied by accumulating coffee powder discharged from the crushing chamber, and an extraction course selecting means for selecting an extraction pattern of the coffee liquid And a duty ratio calculating means and a duty energizing time calculating means for calculating an energizing duty ratio and a duty energizing time to the heating means by an output of the extraction course selecting means. The heating control unit includes a timer unit that counts a predetermined time corresponding to the extraction course selected by the extraction course selection unit. The power is supplied to the heating means at a predetermined duty ratio until the time elapses, and the power is continuously supplied to the heating means after a predetermined time elapses.

Further, as means for solving the second problem, in addition to the above-mentioned first problem solving means, the number of cups setting means for setting the amount of coffee liquid to be extracted, and the number of cups setting means and the extraction course selecting means are provided. The heating control means includes a duty energization time calculating means for calculating a time for performing the duty energization to the heating means based on the output. The heating means is energized at a duty ratio of, and the heating means is continuously energized after the duty energizing time has elapsed.

In addition to the first problem solving means as a third problem solving means, a water amount detecting means for detecting an amount of water contained in a water container, and a water amount detecting means and an extraction course selecting means are provided. The heating control means includes a duty energization time calculating means for calculating a time for performing the duty energization to the heating means based on the output. The heating means is energized at a duty ratio of, and the heating means is continuously energized after the duty energizing time has elapsed.

Further, as means for solving the fourth problem, in addition to the above-mentioned first problem solving means, crushing end detecting means for detecting the end of grinding of coffee beans, and from the start to the end of crushing by the output of the crushing detecting means. Crushing time measuring means for calculating the time of, the duty control time calculating means for calculating the time to perform the duty power supply to the heating means by the output of the extraction course selecting means and the output of the crushing time measuring means, heating control means, A structure in which the heating unit is energized at a predetermined duty ratio until the time obtained by the duty energization time calculation unit elapses from the start of the extraction of the coffee liquid, and the heating unit is energized continuously after the elapse of the duty energization time. It is assumed that.

Further, as a means for solving the fifth problem, the time from the start of coffee liquid extraction to the start of continuous energization obtained by the duty energization time calculation means is shorter than the time required to complete the extraction of coffee liquid. It is configured to take time.

Further, as a means for solving the sixth problem, the heating control means changes the heating duty ratio from the start of coffee liquid extraction to the start of continuous energization determined by the duty energization time calculating means while changing the energization duty ratio. It is configured to energize the means.

[0014]

According to the first aspect of the present invention, even when the heating means is energized at a predetermined duty ratio, the heating means is continuously energized after a lapse of a predetermined time from the start of coffee liquid extraction. Even when the temperature of the coffee liquid is low when the extraction is completed, the temperature will rise to a desired temperature.

Further, in the second problem solving means, even when the heating means is energized at a predetermined energizing duty ratio, the heating means is continuously energized after a predetermined time has elapsed in accordance with the energizing duty ratio and the set water amount. Thus, the extracted coffee liquid is heated to a desired temperature in a short time.

Further, in the third problem solving means, even when the heating means is energized with a predetermined energizing duty ratio, the heating means is continuously energized after a predetermined time elapses in accordance with the energizing duty ratio and the detected amount of water. Thus, the extracted coffee liquid is heated to a desired temperature in a short time.

In the fourth means for solving the problems, even when the heating means is energized at a predetermined energizing duty ratio, the heating means is continuously energized after a predetermined time has elapsed from the energizing duty ratio and the time required for grinding the coffee beans. Therefore, the temperature of the extracted coffee liquid is raised to a desired temperature in a short time.

In the fifth means for solving the problems, since the heating means is continuously energized before the extraction of the coffee liquid is completed, the temperature of the coffee liquid is raised to a predetermined temperature when the extraction of the coffee liquid is completed.

Further, in the sixth means for solving the problems, the energizing duty ratio is increased in accordance with the extraction amount of the coffee liquid, and the extracted coffee liquid is reduced in a short time by increasing the temperature rise rate of the coffee liquid. Temperature.

[0020]

【Example】

Embodiment 1 Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 is a block diagram showing the structure of a coffee brewing apparatus according to the first embodiment. As shown in FIG. 1, an extraction course selecting means 15 for extracting coffee liquid according to the user's preference is provided. Duty ratio calculating means 16 which receives the output of the extraction course selecting means 15 and calculates the energization duty ratio τd to the heating means 3 at the time of extraction suitable for each course.
And a duty energizing time calculating means 17 which receives the output of the extracting course selecting means 15 as input and calculates a time Td for continuing energizing the heating means 3 with a duty ratio τd from the start of extraction in each extracting course, and a heating controlling means 19 And a time measuring means 18 for measuring the time t from the start of the extraction of the coffee liquid by the output of. The heating control means 19 controls the heating means 3 using the outputs of the duty ratio calculating means 16, the duty energizing time calculating means 17 and the timer means 18 as inputs. In this embodiment, the duty ratio calculating means 16 and the duty energizing time calculating means 1
7. The timing means 18 and the heating control means 19 are realized by a one-chip microcomputer.

In the above configuration, the operation of this embodiment will be described with reference to FIG.
Side, and when the extraction of the coffee liquid is started, first, in step 101, the extraction course selecting means 15 is selected.
The energization duty ratio τd at the time of extraction and the time Td for energizing the duty are determined by the duty ratio calculation means 16 and the duty energization time calculation means 17, respectively, according to the course selected by (1). In step 102, the timer 18 is reset to start measuring the time t from the start of extraction, and the process proceeds to step 103. In step 103, the heating control means 19 starts duty energization to the heating means 3 at an energization duty ratio τd, and proceeds to step 104. In step 104, the time counting means
, The elapsed time t from the start of the extraction is measured and output to the heating control means 19, and the routine proceeds to step 105. In step 105, the heating control means 19 executes step 104
Is compared with the duty energizing time Td obtained in step 101, and if t <Td, the process returns to step 104 to continue the duty energizing to the heating means 3,
If t ≧ Td, the process proceeds to step 106. Step 10
In 6, the heating control means 19 starts continuous energization of the heating means 3 and ends the extraction of the coffee liquid by duty energization.

FIG. 3 is a diagram showing the state of energization of the heating means 3 from the start of the operation of the coffee brewer and the temperature of the coffee liquid extracted and stored in the glass container 5. The state of energization of the heating means 3 is changed from the start of operation to the water channel switching valve 11.
Is switched to the side of the extraction chamber 4 and continuous energization is performed until the extraction is started, and thereafter energization is performed at the energization duty ratio τd calculated by the duty ratio calculation unit 16 until the time Td calculated by the duty energization time calculation unit 17 elapses. Is performed. Then, after the passage of Td, the heating means 3 is continuously energized again. At this time, the temperature of the extracted coffee liquid is such that the heating means 3 is warm immediately after starting the extraction,
In addition, since the amount of extraction is small, the extraction is quickly started, but thereafter, the extraction is continued while the rate of temperature rise is small. When the extraction of the coffee liquid is completed, the temperature rise rate becomes larger than before, and after Td has elapsed since the start of the extraction, the continuous energization is performed.
The temperature of the coffee liquid is set to a desired temperature KO (80 in this embodiment).
° C).

As a result, even when the heating means 3 is energized at a predetermined energizing duty ratio when extracting the coffee liquid, the heating means 3 is continuously energized after a predetermined time has elapsed in accordance with the energizing duty ratio. The heated coffee liquor can be raised to a desired temperature. In the present embodiment, the energization duty ratio τd and the duty energization time Td
Is performed after the switching valve 11 is switched to the extraction chamber 4 side and the extraction is started.
The same effect can be obtained even when the operation is performed after the operation is performed and before the extraction is started.

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 4 is a block diagram showing the structure of a coffee brewer according to the second embodiment. As shown in FIG. 4, an extraction course selecting means 15 for extracting coffee liquid according to the user's preference is provided. A duty ratio calculating means 16 for inputting the output of the extraction course selecting means 15 to calculate an energization duty ratio τd to the heating means 3 at the time of extraction, and a cup for setting the amount of coffee liquid to be extracted in units of the number of cups The number setting means 20, the output of the extraction course selection means 15 and the output of the number of cups setting means 20 are input, and the duty ratio τd from the start of extraction for each extraction course and the set number of cups
A duty energizing time calculating means 21 for calculating a time Td for continuing energization of the heating means 3, and a time measuring means 18 for measuring a time t from the start of coffee liquid extraction by an output of the heating control means 22. It has. The heating control means 22 controls the heating means 3 with the outputs of the duty ratio calculating means 16, the duty energizing time calculating means 21 and the time measuring means 18 as inputs. In the present embodiment, the duty ratio calculating means 16 and the duty energizing time calculating means 2
1. The clocking means 18 and the heating control means 22 are realized by a one-chip microcomputer.

FIG. 5 is a diagram showing the relationship between the number of cups set by the cup number setting means 20 and the duty energizing time Td obtained by the duty energizing time calculating means 21.
A course in which the set number of cups (1 to 5 cups) is selected by 2 cups (in the present embodiment, the energization duty ratio τ
d) is τd = １ ／, then Td = 4 minutes, τd =
In the case of ／, Td = 2 minutes and 30 seconds. By determining the number of cups set in this way and the course to be selected, the duty energizing time Td can be obtained. The heating control unit 22 performs the same control as the heating control unit 19 in the first embodiment based on the obtained τd and Td.

As a result, even when the heating means 3 is energized at a predetermined energizing duty ratio when extracting the coffee liquid, the heating means 3 is continuously energized after a predetermined time elapses according to the energizing duty ratio and the set amount of water. Therefore, the temperature of the extracted coffee liquid can be raised to a desired temperature in a short time.

(Embodiment 3) Next, a third embodiment of the present invention will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 6 is a block diagram showing the configuration of a coffee brewer according to the third embodiment. As shown in FIG. 6, an extraction course selecting means 15 for extracting coffee liquid according to the user's preference is provided. A duty ratio calculating means 16 for inputting an output of the extraction course selecting means 15 to calculate an energization duty ratio τd to the heating means 3 at the time of extraction, and a temperature sensing element 23a in contact with the water pipe 2 below the water container 1. Water amount calculating means 23 which receives the output of the temperature sensing element 23a as input and calculates the amount of water contained in the container 1 from the temperature rise rate during circulation of the heated water.
b, the water amount detecting means 23 for detecting the water amount in the water container 1 and the output of the extraction course selecting means 15 and the output of the water amount detecting means 23 are input, and extraction is started from the selected extraction course and the detected water amount. And a duty energizing time calculating means 24 for calculating a time Td for continuing energizing the heating means 3 with a duty ratio τd, and measuring a time t from the start of coffee liquid extraction by an output of the heating control means 25. And a timing unit 18. The heating control means 2
Reference numeral 5 controls the heating means 3 using the outputs of the duty ratio calculating means 16, the duty energizing time calculating means 24 and the time measuring means 18 as inputs. In this embodiment, the duty ratio calculating means 16, the water amount calculating means 23b, the duty energizing time calculating means 24, the clocking means 18, and the heating control means 2
Reference numeral 5 is realized by a one-chip microcomputer.

FIG. 7 is a diagram showing the relationship between the water amount obtained by the water amount detecting means 23 and the duty energizing time Td obtained by the duty energizing time calculating means 24. If the course (in the present embodiment, indicated by the energization duty ratio τd) in which the water amount obtained by the water amount detection means 23 is 0.56 liters is τd = １ ／, Td is 6 minutes and τd = 3/4.
In this case, Td is 3 minutes and 30 seconds. Thus, the duty energizing time Td can be obtained from the water amount obtained by the water amount detecting means 23 and the selected course. The heating control means 25 performs the same control as the heating control means 19 in the first embodiment based on the obtained τd and Td.

As a result, even when the heating means 3 is energized at a predetermined energizing duty ratio when extracting the coffee liquid, the heating means 3 is continuously energized after a predetermined time elapses in accordance with the energizing duty ratio and the detected amount of water. Therefore, the temperature of the extracted coffee liquid can be raised to a desired temperature in a short time.

(Embodiment 4) Next, a fourth embodiment of the present invention will be described with reference to FIGS. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 8 is a block diagram showing the configuration of a coffee brewer according to the fourth embodiment. As shown in FIG. 8, an extraction course selection means 15 for extracting coffee liquid according to the user's preference is provided. A duty ratio calculating means 16 for calculating an energization duty ratio τd to the heating means 3 at the time of extraction by using an output of the extraction course selecting means 15 as an input, a piezoelectric element 26a attached to an outer wall of the crushing chamber 4, Piezoelectric element 2
A detection unit 26b that receives the output of the piezoelectric element 26a as an input and detects the end of pulverization based on the rate of change in the output level of the piezoelectric element 26a; A crushing time measuring means 27 which takes an output and an output of the crushing end detecting means 26 as inputs and measures the time from the start of crushing of coffee beans to the end of crushing, an output of the extraction course selecting means 15 and a crushing time measuring. The output of the means 27 is used as an input, and the duty energizing time calculating means 28 and the heating control means 29 are used to calculate the time Td to continue energizing the heating means 3 with the duty ratio τd from the start of extraction from the selected extraction course and the measured crushing time. And a time measuring means 18 for measuring the time t from the start of the extraction of the coffee liquid by the output of. The heating control means 2
Numeral 9 controls the heating means 3 using the outputs of the duty ratio calculating means 16, the duty energizing time calculating means 28 and the time measuring means 18 as inputs. In the present embodiment, the duty calculating means 16, the detecting unit 26b, the crushing time measuring means 27,
The duty energizing time calculating means 28, the time measuring means 18, and the heating control means 29 are realized by a one-chip microcomputer.

FIG. 9 shows the coffee bean crushing time obtained by the crushing time measuring means 27 and the duty energizing time calculating means 2.
FIG. 8 is a diagram illustrating a relationship between duty energizing times Td obtained in FIG. If the course selected by the crushing time measuring means 27 with the crushing time of 15 seconds (in this embodiment, indicated by the energization duty ratio τd) is τd = １ ／, then Td
= 5 minutes, and when τd is ／, Td = 3 minutes. Thus, the duty energizing time Td can be obtained from the pulverization time obtained by the pulverization time timer 27 and the selected course. The heating control means 25 performs the same control as the heating control means 19 in the first embodiment based on the obtained τd and Td.

As a result, even when the heating means 3 is energized at a predetermined energizing duty ratio when extracting the coffee liquid, the heating means 3 is not operated after a predetermined time elapses according to the energizing duty ratio and the time required for grinding the coffee beans. , The extracted coffee liquid can be raised to a desired temperature in a short time. In this embodiment, the crushing end detecting means 26 is configured to use the piezoelectric element 26a. However, a configuration in which a change in load current flowing through the motor 8 is detected to detect the crushing end of coffee beans may be employed. Similar effects can be obtained.

(Embodiment 5) Next, a fifth embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 10 is a diagram showing the state of energization of the heating means 3 from the start of the operation of the coffee machine and the temperature of the coffee liquid contained in the extracted glass container 5. The state of energization of the heating means 3 is such that the energization is continuously performed from the start of the operation to the start of extraction by switching the water channel switching valve 11 to the extraction chamber 4 side, and thereafter, the energization of the duty (the energization duty ratio τd = 1 / in the present embodiment). 2) is performed. Then, when the time Td elapses from the start of the extraction, the continuous energization to the heating means 3 is started again. Here, assuming that Td is a time shorter than the time until completion of the extraction (a time shorter than 60 seconds in this embodiment), the temperature of the extracted coffee liquid at this time is determined by the heating means 3 immediately after the start of the extraction. It ’s warm,
In addition, although the amount of extraction is small, it rises quickly, but then rises at a small rate of temperature rise, and the time Td from the start of extraction increases.
When the extraction is completed, the temperature rise rate increases, and when the extraction is completed, the temperature of the coffee liquid is reduced to the desired temperature KO (80 in the present embodiment).
° C).

As a result, the temperature of the coffee liquor can be made higher than the desired temperature when the brewing is completed by setting the time of the duty energization for the coffee brewing to be shorter than the time from the start of the brewing to the completion of the brewing. .

Embodiment 6 Next, a sixth embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

FIG. 11 shows the state of energization of the heating means 3 from the start of the operation of the coffee brewer and the state of the extracted glass container 5.
It is a figure which shows the temperature of the coffee liquid accommodated in the inside. The state of energization of the heating means 3 is changed from the start of operation to the water channel switching valve 1.
1 is switched to the extraction chamber 4 side and continuous energization is performed until the extraction is started, and thereafter the energization duty ratio τd is changed (in this embodiment, the energization duty ratio τd = 2/5, 3
/ 5, 4/5) Duty energization is performed. Then, when the time Td elapses from the start of the extraction, the continuous energization to the heating means 3 is started again. At this time, the temperature of the extracted coffee liquid rises quickly because the heating means 3 is warm immediately after the start of the extraction and the amount of extraction is small, but thereafter the temperature rise rate becomes small. However, the extraction is continued while increasing the temperature rise rate by changing the energization duty ratio, and the temperature of the coffee liquid is reduced to the desired temperature K.
O (in this embodiment, 80 ° C.).

As a result, the energization duty ratio is increased in accordance with the amount of the extracted coffee liquid, and the rate of temperature rise of the coffee liquid is increased, so that the time required to raise the temperature of the coffee liquid to a desired temperature from the completion of extraction. Can be shortened.

[0043]

As is apparent from the above description, according to the present invention, when the duty is supplied to the heating means at the time of extraction in order to extract the user's favorite coffee liquid, a predetermined time has elapsed from the start of the extraction. After elapse, the heating means is continuously energized, and the extracted coffee liquid can be raised to a desired temperature.

Further, by setting the amount of water by the cup number setting means, the time from the start of the extraction by the duty energization to the start of the continuous energization can be set finely, and the extracted coffee liquid can be raised to a desired temperature. Can be shortened.

Further, by detecting the amount of water contained in the water container by the water amount detecting means, the time from the start of the extraction by the duty energization to the start of the continuous energization can be set continuously, and the extracted The time required to raise the coffee liquor to the desired temperature can be reduced.

Further, by measuring the time required to pulverize the coffee beans by the pulverization time measuring means, the time from the start of the extraction by the duty energization to the start of the continuous energization can be set continuously. The time required to raise the temperature of the coffee liquor to a desired temperature can be reduced.

Further, by making the time from the start of the extraction by the duty energization to the start of the continuous energization shorter than the time from the start of the extraction to the completion of the extraction,
Upon completion of the extraction, the temperature of the coffee liquid can be raised to a desired temperature.

Furthermore, by changing the energization duty ratio in accordance with the amount of coffee liquid to be extracted between the start of the duty energization and the start of the continuous energization, it is possible to uniformly change the temperature of the extracted coffee liquid while maintaining a desired temperature. Temperature can be raised to a certain temperature.

[Brief description of the drawings]

FIG. 1 is a block diagram of a coffee brewer according to a first embodiment of the present invention.

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

FIG. 3 is a diagram showing a state of power distribution and a temperature change of the coffee brewer.

FIG. 4 is a block diagram of a coffee brewer according to a second embodiment of the present invention;

FIG. 5 is a correlation diagram of the number of cups of the coffee brewer and the duty energizing time.

FIG. 6 is a block diagram of a coffee brewer according to a third embodiment of the present invention.

FIG. 7 is a correlation diagram between the amount of water detected by the coffee brewer and the duty energizing time.

FIG. 8 is a block diagram of a coffee brewer according to a fourth embodiment of the present invention.

FIG. 9 is a correlation diagram of coffee bean crushing time and duty energizing time of the coffee machine.

FIG. 10 is a diagram showing a current-carrying state and a temperature change of a coffee brewer according to a fifth embodiment of the present invention.

FIG. 11 is an energized state and a temperature change diagram of a coffee brewer according to a sixth embodiment of the present invention.

FIG. 12 is a block diagram of a conventional coffee machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water container 3 Heating means 4 Extraction chamber 6 Crushing chamber 7 Crushing means 8 Motor 9 Motor control means 15 Extraction course selection means 16 Duty ratio calculation means 17 Duty conduction time calculation means 18 Clocking means 19 Heating control means

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-49814 (JP, A) JP-A-62-41622 (JP, A) JP-A-63-95009 (JP, A) JP-A-Heisei 4- 312417 (JP, A) JP-A-63-135113 (JP, A) JP-A-5-161549 (JP, A) JP-A-5-123261 (JP, A) JP-B-1-37134 (JP, B2) (58) Field surveyed (Int. Cl. ⁷ , DB name) A47J 31/00-31/60

Claims (6)

(57) [Claims] 1. A water container for accommodating water, heating means for heating the water introduced from the water container to supply hot water, heating control means for controlling power supply to the heating means, and pulverizing 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 housed, and coffee powder discharged from the crushing chamber. An extraction chamber for extracting the coffee liquid with hot water supplied thereto, extraction course selection means for selecting a coffee liquid extraction pattern, and an energization duty (du) to the heating means based on an output of the extraction course selection means.
ty) A duty ratio calculating means and a duty energizing time calculating means for calculating a ratio and a duty energizing time, and a timing means for measuring a predetermined time corresponding to the extraction course selected by the extraction course selecting means. The heating control means conducts electricity to the heating means at a predetermined duty ratio until the predetermined time counted by the clocking means has elapsed since the start of the extraction of the coffee liquid, and after the predetermined time has elapsed, A coffee brewer with a configuration in which the heating means is continuously energized. 2. A number-of-cups setting means for setting an amount of coffee liquid to be extracted, and a duty-energizing-time calculating means for calculating a time for applying a duty to the heating means based on outputs of the number-of-cups setting means and an extraction-course selecting means. The heating control means conducts electricity to the heating means at a predetermined duty ratio until the time obtained by the duty energization time calculating means elapses from the start of coffee liquid extraction, and after the elapse of the duty energizing time, 2. A coffee brewing machine according to claim 1, wherein the heating means is configured to continuously energize the heating means. 3. A water amount detecting means for detecting an amount of water contained in a water container, and a duty energizing time calculating means for calculating a time for performing a duty energizing to the heating means by an output of the water amount detecting means and an extraction course selecting means. The heating control means conducts electricity to the heating means at a predetermined duty ratio until the time obtained by the duty energization time calculating means elapses from the start of coffee liquid extraction, and after the elapse of the duty energizing time, 2. A coffee brewing machine according to claim 1, wherein the heating means is configured to continuously energize the heating means. 4. A pulverization end detecting means for detecting the end of pulverization of coffee beans, a pulverization time measuring means for obtaining a time from the start to the end of pulverization by an output of the pulverization end detection means, an output of an extraction course selecting means, The heating control means comprises a duty energizing time calculating means for calculating a time for performing the duty energizing to the heating means by an output of the crushing time measuring means. 2. The coffee brewing machine according to claim 1, wherein the heating means is energized at a predetermined duty ratio until the time elapses, and the heating means is continuously energized after the duty energizing time elapses. 5. The duty energizing time calculating means sets the time from the start of the duty energization to the start of the continuous energization to be shorter than the time from the start of coffee liquid extraction to the completion of coffee liquid extraction. The coffee brewing machine according to any one of claims 2, 3, and 4, wherein 6. The heating control means is configured to energize the heating means while changing the energization duty ratio from the start of coffee liquid extraction to the start of continuous energization determined by the duty energization time calculation means. A coffee brewer according to any one of 2, 3, and 4.