JPS6364971B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coffee extractor that generates hot water by energizing an electric heater and supplies the hot water into a coffee extraction case containing coffee powder.

In this conventional coffee extractor, in order to obtain so-called strong coffee, which is darker than the regular coffee liquid, so-called regular coffee, a larger amount of coffee powder is used than in the case of regular coffee. There was a problem where coffee powder was consumed significantly.

The present invention has been made in view of the above circumstances, and its object is to provide a coffee extractor that can selectively extract regular coffee and strong coffee using the same amount of coffee powder.

An embodiment of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a 60 hertz, 100 volt single-phase AC power supply, and a series circuit of a bimetal switch 2, an electric heater 3, and an output switch 4a of a drive circuit 4, which will be described later, is connected between both terminals of the power supply. in this case,
The electric heater 3 is attached to a hot water supply (drip) mechanism (not shown), and the hot water supply mechanism generates hot water by heating water supplied to the heater from a water storage tank with the electric heater 3. The boiling pressure of the boiling water is used to supply the hot water into a coffee extraction case containing coffee powder to extract coffee liquid. Reference numeral 5 denotes a frequency dividing circuit whose input terminal is connected to the single-phase AC power supply 1. When a high level signal is applied to the gate terminal G, this frequency divider circuit starts frequency dividing operation and divides the frequency into one signal every minute, for example. A high level output pulse is generated from the output terminal O. 6 is a start switch;
When pressed, this generates a high-level start signal only while the pressing operation is being performed. 7
is a stop switch which, when pressed, generates a high-level stop signal only while it is being pressed. Reference numeral 8 designates a strong switch which, when pressed, generates a high-level strong selection signal only while the switch is being pressed. Reference numeral 9 denotes a regularity switch which, when pressed, generates a high-level regularity selection signal only while being pressed. Reference numerals 10 and 11 indicate RS type flip-flop circuits which are memory circuits, and the set input terminal S of the flip-flop circuit 10 receives a start signal from a start switch 6, and the reset input terminal R receives a stop signal from a stop switch 7. The strong selection signal of the strong switch 8 is applied to the set input terminal S of the flip-flop circuit 11, and the regular selection signal of the regular switch 9 is applied to the reset input terminal R of the flip-flop circuit 11. Further, the set output signal from the set output terminal Q of the flip-flop circuit 10 is applied to a one-shot multivibrator 12, and this one-shot multivibrator 12 is provided with a high-level set output signal from the flip-flop circuit 10. Triggered by the rising edge of the pulse, one high-level output pulse is output from the output terminal, and this is applied to the gate terminal G of the frequency divider circuit 5 and also to the preset input terminal PR of the preset type counter 13. It's getting old. In this counter 13, the value stored in the set value storage circuit 14 is stored at the input terminal IN, for example, "2".
An output signal indicating the clock input terminal is given.
CK is supplied with an output signal from an AND circuit 15 whose first input terminal is supplied with the output pulse of the frequency divider circuit 5. When a pulse is applied to the preset input terminal PR, this counter 13 is preset to the stored numerical value "2" in the set value storage circuit 14 as the initial setting value, and thereafter is subtracted every time a pulse is applied to the clock input terminal CK. It is designed to perform a counting operation. In this case, the counter 13 generates a high level output signal from the output terminal O ₂ when the count content is "2", and generates a high level output signal from the output terminal O ₁ when the count content is a specific value "1". is generated, and the count content is "0" which is the predetermined value.
When , a high-level output signal is generated from the output terminal _O0 , and the output signal from the output terminal _O0 is applied to the second input terminal of the AND circuit 15 via the inverter circuit 16. It's getting old. Reference numeral 17 denotes an AND circuit which is a first judgment circuit, the output signal of the output terminal _O1 of the counter 13 is applied to its first input terminal via the inverter circuit 18, and the output signal of the output terminal O1 of the counter 13 is applied to its second input terminal. A set output signal from the set output terminal Q of the flip-flop circuit 10 is applied, and a set output signal from the set output terminal Q of the flip-flop circuit 11 is applied to the third input terminal. Reference numeral 19 denotes an AND circuit which is a second judgment circuit, and its first input terminal receives the set output signal from the set output terminal Q of the flip-flop circuit 10, and its second input terminal receives the set output signal from the set output terminal Q of the flip-flop circuit 11. A reset output signal is provided at the reset output terminal. The output signals of these AND circuits 17 and 19 are applied to the drive circuit 4 via an OR circuit 20. Therefore, this drive circuit 4 is
It is equipped with a relay or the like that turns on and off the output switch 4a, and the drive command signal, which is a high-level output signal, is applied from the OR circuit 20 to the relay, which turns on the output switch 4a, and outputs a low-level signal from the OR circuit 20. When a stop command signal, which is an output signal, is given, the relay is cut off and the output switch 4a is turned off.

Next, the operation of this embodiment will be explained. When producing coffee liquid, the amount of water equivalent to the number of people desired is injected into the water storage tank of the hot water supply mechanism, the corresponding amount of coffee powder is stored in the coffee liquid extraction case, and the water supply mechanism Place the bottle that stores the coffee liquid on the heater.

First, we will discuss how to obtain regular coffee.
When the regulator switch 9 is pressed, the regulator switch 9 is turned on and a high-level regulator selection signal is applied to the reset input terminal R of the flip-flop circuit 11, and the flip-flop circuit 11 enters the reset state and is reset. A high-level reset output signal is generated from the output terminal, and the fact that the regular switch 9 has been selectively pressed is stored. Next, when the start switch 6 is pressed, the start switch 6 is turned on and a high-level start signal is applied to the set input terminal S of the flip-flop circuit 10, and the flip-flop circuit 10 enters the set state. A high-level set output signal is now generated from the set output terminal Q, and the fact that the start switch 6 has been pressed is memorized. The high-level set output signal of the flip-flop circuit 10 and the high-level reset output signal of the flip-flop circuit 11 are applied to the AND circuit 19, so the AND circuit 19 generates a high-level output signal and outputs it to the OR circuit. 20 as a drive command signal to the drive circuit 4, and the drive circuit 4 continuously turns on the output switch 4a as shown in FIG. 2a by continuously energizing the relay. . Therefore, the electric heater 3 is energized via the bimetal switch 2 and the output switch 4a, and the water in the heater supplied from the water storage tank is heated by the heat generated by the electric heater 3 to generate hot water. . The hot water thus generated is supplied into the case under its boiling pressure and extracted as coffee liquid, and the extracted coffee liquid is stored in a bottle placed on a heater. In this way, the electric heater 3
When coffee liquid is extracted by continuously supplying hot water (dripping) into the case by continuously energizing according to the regular drip pattern shown in Figure a,
The coffee liquid has a normal concentration and regular coffee is obtained. After that, when all the water in the water storage tank of the hot water supply mechanism is consumed, the temperature of the heater will rise rapidly due to no heat exchange between the heater and the water, and the bimetal switch 2 will open and the hot water supply will start. Coffee liquid extraction is completed. Thereafter, the bimetal switch 2 opens and closes intermittently to control the electric heater 3 to turn on and off, and the bottle is heated by the heater to keep the coffee liquid stored in the bottle warm. . In addition, if you want to stop this kind of heat retention, press the stop switch 7.
When pressed, the stop switch 7 is turned on and a high-level stop signal is applied to the reset input terminal R of the flip-flop circuit 10, and the flip-flop circuit 10 is inverted to the reset state and the set output terminal Q is turned on. The set output signal is set to a low level, thereby canceling the memory that the start switch 6 was pressed. Therefore, when one of the input signals becomes low level, the AND circuit 19 generates a low level output signal, and this is given to the drive circuit 4 as a stop command signal via the OR circuit 20. The drive circuit 4 cuts off the power to the relay and turns off the output switch 4a.

Now, let's talk about how to get strong coffee. When the strong switch 8 is pressed,
This strong switch 8 is turned on and a high-level strong selection signal is applied to the set input terminal S of the flip-flop circuit 11, and the flip-flop circuit 11 is inverted to the set state and a high-level set signal is output from the set output terminal Q. An output signal is generated, and the fact that the strong switch 8 has been selectively pressed is stored. Next, when the start switch 6 is pressed, the flip-flop circuit 10 is activated as described above.
is inverted to the set state and generates a high level set output signal from the set output terminal Q. and,
The set output signal of the flip-flop circuit 10 is given to the one-shot multivibrator 12, so the one-shot multivibrator 12 generates one high-level output pulse to the gate terminal G of the frequency divider circuit 5 and the counter 13. Apply to preset input terminal PR. As a result, the frequency dividing circuit 5 starts the frequency dividing operation, and the stored numerical value "2" of the set value storage circuit 14 is preset in the counter 13 as an initial set value. Therefore, at this time, the output terminal of the counter 13
O ₂ generates a high-level output signal, but output terminals O ₁ and O ₀ generate low-level output signals, and the inverter circuit 18 to which the low-level output signal of the output terminal O ₁ is applied The output signal becomes high level. As a result, the AND circuit 17, which is supplied with the high level output signal of the inverter circuit 18, the high level set output signal of the flip-flop circuit 10, and the high level set output signal of the flip-flop circuit 11, generates a high level output signal. This is given as a drive command signal to the drive circuit 4 via the OR circuit 20, so the drive circuit 4 energizes the relay and turns on the output switch 4a. As a result, the electric heater 3 is energized and the hot water supply mechanism starts supplying hot water into the case in the same manner as described above. Thereafter, when a certain period of time ta (for example, 1 minute) has elapsed, the frequency divider circuit 5 generates one high-level output pulse and applies it to the first input terminal of the AND circuit 15. At this time, the AND circuit 15
The output terminal of the counter 13 is connected to the second input terminal of the counter 13.
O ₀ low level output signal is inverter circuit 1
6 as a high level signal, the AND circuit 15 generates a high level output signal, that is, an output pulse, and applies it to the clock input terminal CK of the counter 13. As a result, the counter 13 performs a counting operation to subtract "1" from the set value "2", and the count value becomes "1" which is a specific value, and the output terminal _O1 generates a high level output signal. The output signal of the inverter circuit 18 becomes low level. Therefore, when one input signal becomes low level, the AND circuit 17 generates a low level output signal, and this is given as a stop command signal to the drive circuit 4 via the NOR circuit 20, and the output switch is activated. 4a is turned off as shown in FIG. 2b, the electric heater 3 is cut off, and the hot water supply (drip) into the case by the hot water supply mechanism is stopped. Then, the hot water supplied into the case by energizing the electric heater 3 for a certain period of time ta (for example, 1 minute) penetrates the entire area of the coffee powder in the case and moistens the entire coffee powder. Extraction of the contained coffee extract is promoted. After that, when a certain period of time tb (for example, 1 minute) has elapsed, the frequency divider circuit 5 generates one more high-level output pulse, which is then output to the AND circuit 1.
5 to the clock input terminal CK of the counter 13.
Therefore, the counter 13 performs a counting operation to subtract "1" from the previous count value "1", and the count value becomes "0" which is a predetermined value, and a high level signal is output from the output terminal _O0 . Generates an output signal. Therefore, the output signal of the output terminal _O1 of the counter 13 becomes low level, the output signal of the inverter circuit 18 becomes high level, and the AND circuit 17 again generates a high level output signal, which is passed through the OR circuit 20. As a result, the output switch 4a is turned on again as shown in FIG. 2b to energize the electric heater 3, and the hot water supply mechanism resumes supplying hot water into the case. do. On the other hand, when the output signal of the output terminal _O0 of the counter 13 becomes a high level, the output signal of the inverter circuit 16 becomes a low level, and even if the frequency divider circuit 5 generates a high level output pulse thereafter, this will not affect the output of the counter 13. It is not applied to the clock input terminal CK, and therefore, the counter 13 stops counting when its count value is "0" which is a predetermined value. As a result, from then on, the AND circuit 17 continuously generates a high-level output signal, and the drive circuit 4
The output switch 4a is turned on continuously, and hot water is continuously supplied into the case from the hot water supply mechanism, and coffee liquid is extracted. The subsequent operations are similar to those for obtaining regular coffee described above. In this way, the electric heater 3 is controlled to be energized and de-energized according to the strong drip pattern shown in FIG. When the coffee liquid is extracted, the coffee liquid has a higher concentration than the regular coffee mentioned above, and strong coffee can be obtained.

On the other hand, even if the regular switch 9 is selectively pressed, when the start switch 6 is pressed to start the operation, the flip-flop circuit 10 enters the set state and its set output terminal Q is pressed.
Based on the set output signal becoming high level, the counter 13 is preset to an initial setting value "2", and the counter 13 starts counting operation. Therefore, if the push operation of the strong switch 8 is changed before the elapse of a certain time ta (for example, 1 minute) after the push operation of the regular switch 9, the flip-flop circuit 11 in the reset state is reversed to the set state. Since the high level set output signal of the set output terminal Q is given to the AND circuit 17, the drive circuit 4 is changed to be controlled by the counting operation of the counter 13, and in this case as well, strong coffee is produced. is obtained. Also, after the regularity switch 9 is pressed, a certain period of time ta has elapsed, and a certain period of time has passed.
If the push operation of the strong switch 8 is changed before the elapse of tb (for example, 1 minute), the drive circuit 4 will be changed to be controlled by the counting operation of the counter 13, as described above.
At this time, since the count value of the counter 13 has already reached the specific value "1", the output switch 4a is immediately turned off and hot water supply is stopped. Then, when the above-mentioned fixed time tb has elapsed, the counter 1
The count value of 3 becomes "0" and hot water supply starts. That is, in this case, for a certain period of time tb
The hot water supply is stopped for the remaining time after the press operation of the strong switch 8 is changed during the hot water supply stop time, and the extracted coffee liquid is close to strong coffee. Furthermore,
After a certain period of time ta and tb has passed after pressing the regular switch 9, the strong switch 8 is pressed.
When the pressing operation is changed, the counter 13 has already stopped counting, the count value has become "0", and continuous hot water supply has started, so no change is actually made. Therefore, in this case, regular coffee will be obtained.

By the way, when the count value of the counter 13 reaches the predetermined value "0", the output signal of the output terminal _O0 is sent to the AND circuit 1 via the inverter circuit 16.
The reason why the counting operation of the counter 13 is stopped by applying the signal to the counter 13 is based on the following reason. That is, when extracting strong coffee, if a pulse is applied to the clock input terminal CK to cause the counter 13 to perform a counting operation even after the count value of the counter 13 reaches "0", the counting capacity of the counter 13 will be In the corresponding cycle, there are times when the output signal of the output terminal _O1 is at a high level, and therefore, there is a problem that there is a period when the hot water supply is stopped again in the continuous hot water supply period after the elapse of the certain time tb. Therefore, if the counting operation of the counter 13 is stopped once the count value of the counter 13 reaches "0", the above-mentioned problem will not occur.

The reason why the flip-flop circuit 10 is set to the set state when the start switch 6 is pressed once and the fact that the start switch 6 is pressed is stored is based on the following reason. That is, when a configuration is assumed in which the one-shot multivibrator 12 is directly triggered by a start signal generated by turning on the start switch 6 during strong coffee extraction, the one-shot multivibrator 12 is triggered once the start switch 6 is pressed. If the start switch 6 is accidentally pressed again after the initial setting value "2" has been preset in the counter 13 based on the output pulse of the one-shot multivibrator 12, the output pulse of the one-shot multivibrator 12 Based on this, the initial setting value "2" is again preset in the counter 13, and the preset value of the counter 13 becomes "4".
minutes) after hot water supply (drip) for a certain period of time tb (e.g. 1
A problem arises in which the strong drip pattern shown in FIG. 2b cannot be realized, that is, hot water supply is stopped for a few minutes. Therefore, if the flip-flop circuit 10 is configured to store the first pressing operation of the start switch 6, subsequent pressing operations of the start switch 6 will be invalidated, as shown in FIG. 2b. This makes it possible to reliably realize a strong drip pattern.

Incidentally, in the above embodiment, the control circuit section other than the drive circuit 4 may be constructed by a microcomputer.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and it goes without saying that the present invention may be implemented with appropriate modifications within the scope of the invention.

As explained above, the present invention provides drive command signals,
A drive circuit is provided which controls the electric heater of the hot water supply mechanism to be turned on and off when a stop command signal is given, a counter is provided which starts counting operation based on the operation of the start switch, and the selection operation of the regular switch and the strong switch is provided. A memory circuit for storing the state is provided, and when the memory circuit stores the operation of the strong switch, a drive command signal is provided to the drive circuit together with the operation of the start switch so that the counter reaches a specific value. A first judgment circuit is provided which gives a stop command signal and then gives a drive command signal while the drive circuit is in operation, and when the memory circuit stores the operation of the regular switch, the first judgment circuit sends the start switch to the drive circuit. Since the second judgment circuit is provided to continuously give a drive command signal along with the operation, the operation is as simple as selectively operating the regular switch and the strong switch while using the same amount of coffee powder. Therefore, it is possible to selectively extract regular coffee and strong coffee, and therefore it has excellent effects such as being able to save consumption of coffee powder.

Further, according to the embodiment of the present invention, the counter starts counting from a set value and stops counting at a predetermined value, so that hot water supply is not unnecessarily temporarily stopped when coffee is extracted by continuous hot water supply. This has the effect of preventing things from happening.

Further, according to the embodiment of the present invention, once the start switch is operated, subsequent operations are invalid unless the stop switch is operated, so that the counter does not perform unnecessary counting operations. This has the effect that strong coffee can be reliably obtained without problems such as the time required to reach a specific value.

[Brief explanation of drawings]

FIG. 1 is an electrical configuration diagram showing an embodiment of the present invention, and FIGS. 2a and 2b are diagrams showing a drip pattern of the same embodiment. In the drawing, 3 is an electric heater, 4 is a drive circuit, 4a
is an output switch, 6 is a start switch, 7 is a stop switch, 8 is a strong switch, 9 is a regular switch, 10 and 11 are flip-flop circuits (memory circuits), 13 is a counter, and 17 is an AND circuit (first judgment circuit), 19
indicates an AND circuit (second judgment circuit).

Claims (1)

[Scope of Claims] 1. In a device that generates hot water by energizing an electric heater and supplies it to a case for extracting coffee liquid containing coffee powder, when a drive command signal and a stop command signal are applied, the hot water is A drive circuit that controls power on and off of the heater, a counter that starts counting based on the operation of the start switch, a memory circuit that stores the selection operation status of the regular switch and the strong switch, and this memory circuit When the operation of the start switch is memorized, a drive command signal is given to the drive circuit along with the operation of the start switch, and a stop command signal is given while the counter is at a specific value, and then a drive command signal is given. a first determination circuit; and a second determination circuit that continuously provides a drive command signal to the drive circuit together with the operation of the start switch when the memory circuit stores the operation of the regular switch. A coffee extractor equipped with 2. The coffee extractor according to claim 1, wherein the counter is configured to start counting from a set value and end counting at a predetermined value. 3. The coffee extractor according to claim 1, wherein once the start switch is operated, any subsequent operation is disabled unless the stop switch is operated. .