JPS62189029A - Coffee extractor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention provides a drip case in which water supplied from a water storage tank is turned into hot water in a heating pipe, and the hot water is pushed up by boiling pressure to store coffee grounds. This invention relates to a drip-type coffee extractor that extracts coffee liquid by dripping it into the coffee extractor.

[Technical background of the invention and its problems] Conventionally, as an example of a coffee brewer, a heating vibrator is provided, the base end of which communicates with the bottom of a water storage tank, and the distal end of which is located above the drip case. Add a heater in the middle of the vibrator to heat the water inside it ++? One piece is served. When extracting coffee liquid using such a coffee extractor, electricity is applied to the heater while coffee grounds are stored in the drip case and water is supplied to the water storage tank. When the heater is energized in this way, the water flowing into the heating pipe from the water storage tank is turned into hot water, and the hot water is pushed up by the boiling +1R1 pressure and flows from the tip of the heating vibrator into the drip case. By repeating the dripping operation, all of the water in the water storage tank is finally dripped into the drip case. The hot water thus supplied into the drip case passes through the coffee powder, extracting coffee extract from it, and falls into the storage container installed below the drip case, and is stored as follows. The coffee liquid is extracted.

By the way, in such a coffee brewer, hot water is only started to be supplied into the drip case after a predetermined delay time has elapsed after the heater starts being energized. Detecting the starting point is desirable for performing various controls as described below. In other words, in the drip type coffee brewer as described above, the actual time required to extract coffee liquid (corresponding to the time from the start of hot water supply to the end of hot water supply in the drip case) is controlled to a constant time. is considered to be one of the conditions for obtaining delicious coffee liquid, but in order to control the required extraction time in this way, it is necessary to detect the start point of hot water supply to the drip case. In addition, in the coffee extractor described in item 1, it is said that performing a so-called uneven operation of moistening the coffee powder at the beginning of hot water supply is one of the conditions for obtaining a delicious coffee liquid. In order to accurately control the supply of melon during operation, it is necessary to know the point in time when hot water supply starts.

It is also used to display that hot water supply has started, to lock the lid of the drip case when hot water is being supplied, and to control the operation of a mechanism to prevent the storage container from being removed after hot water supply has started. It is necessary to know the starting point.

However, in the past, there was no coffee brewer that could detect the start point of hot water supply into the drip case using a simple 41M construction, and this point remained an unsolved problem.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its object is to provide a coffee brewer that has effects such as being able to detect the start point of hot water supply to a drip case with a simple structure. .

[Summary of the Invention] In order to achieve the above object, the present invention boils water supplied from a water storage tank in a heating vibrator, and pushes the hot water using boiling pressure to drip into a drip case. In such a so-called drip type coffee brewer, a conclusion detection means for detecting the starting temperature of the heating vibrator is provided, and the point of start of hot water supply to the drip case is detected based on the state of change in temperature detected by the temperature detection means. (1) has been completed.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

Fig. 2 shows the entire coffee maker equipped with a mill function and a drip function. The milling machines 11.j, . . . 4 are motors for driving the milling mechanism 1, and when energized, the cutter 3 is rotated at high speed.

Therefore, when the motor 4 is energized with coffee beans stored in the drip case 2, a milling operation is performed in which the coffee beans are pulverized by the cutter 3 to produce coffee powder. And such a drip case 2
A filter 5 is provided at the bottom of the machine to prevent coffee powder (and coffee beans) from falling. Note that the drip case 2 is provided with M2a. In addition, a diffusion plate 6 having a large number of pouring holes 6a is removably attached to the two-sided opening of the drip case 2, and above the diffusion plate 6, a hot water supply spout body 7 is installed horizontally. It is installed so that it can rotate in any direction.

Reference numeral 8 denotes a water storage tank for supplying water for brewing coffee, 9 a heating plate on which a bottle 10 is placed, and a sheathed heater 11 and a heating vibrator 12 made of metal, for example, on the bottom surface of the heating plate 9. It is attached. In this case, as shown in FIG. It has an arcuate portion 13 arranged along the inner periphery. The heating vibrator 12 is connected to the water storage tank 8 at its proximal end via a check valve (not shown) at its bottom, and is connected to the hot water supply port 7 at its distal end, and the sheathed heater 11 When the water is energized and generates heat, water flowing from the water storage tank 8 into the heating vibrator 12 is heated within the heating vibrator 12 (particularly within the arcuate portion 13) to generate hot water, and the hot water reaches a boiling point of +111 The hot water is pushed up by the pressure and dripped into the drip case 2 from the hot water supply port body 7 through the diffusion holes 6a of the diffusion plate 6. The hot water thus supplied into the drip case 2 extracts coffee extract from it through the culm that passes through the coffee powder in the drip case 2, and then falls and is stored in the bottle 10 via the filter 5. , whereby the coffee liquid is extracted.

Now, the heating vibrator 12 is attached with a temperature sensor 14 as a temperature detection means, which is made of, for example, a thermistor. In this case, the temperature sensor 14 is provided at a position closer to the water storage tank 8 in the arcuate portion 13 of the heating vibrator 12, and therefore the temperature of the hot water generating portion of the heating vibrator 12 can be detected by this temperature sensor 14. I can do it. In addition, 15 is an operation panel, which includes a start switch 16, a stop switch 17, and a selection switch that is selectively turned on depending on the Q (1 force to 5 force) of the coffee liquid to be extracted. 18 to 22 are provided.

FIG. 1 shows the configuration of the mill and drip control circuit provided in the coffee maker, and will be described below. However, it goes without saying that the functions of each part shown in block form in the circuit configuration of FIG. 1 may be obtained by a microcomputer program if necessary.

The motor 4 and relay switch 24 are connected in series to both ends of the commercial AC power source 23, and the sheathed heater 11 and triac 25 are also connected in series. 26 is a constant voltage power supply circuit that is supplied with power from the commercial AC power supply 23 via a step-down transformer 27, and its output line L
Power is supplied from a and Lb to each circuit section described below.

That is, 28 is a waveform shaping circuit, which is a step-down transformer 27.
The secondary side output waveform of is shaped into a rectangular wave to output a synchronization pulse Ps synchronized with the power supply frequency, and this synchronization pulse Ps is given to the pulse generation circuit 29. This pulse generating circuit 29 has three phase output terminals φ1. φ2. φ3
and each output terminal φl based on the input synchronization pulse Ps.

φ2. IHz with a phase difference of 120 degrees from φ3
The clock pulses pl, P2+P3 (see FIG. 5) are output. For example, 30 is a decimal counter, which is provided to count the IHz clock pulse P1. Therefore, the counter 30 outputs a carry pulse P (see Fig. 5) at a period of 10 seconds. be done.

31 is an A-D conversion circuit that converts the detection output of the temperature sensor 14 into a digital value, and outputs the converted value as a temperature signal S1. 32 is the motor drive circuit, which is "1"
When the signal is input, the relay switch 24 is turned on to energize the motor 4, and when the rOJ signal is input, the relay switch 24 is turned off. 33 is a heater drive circuit, which turns on the triac 25 and energizes the sheathed heater 11 when a "1" signal is input, and turns off the triac 25 when the rOJ signal is input manually. 34 is an output control circuit for adjusting the output of the sheathed heater 11 through the heater drive circuit 33; The triac 25 is intermittently turned on by intermittently giving a "1" signal with a cycle corresponding to the period corresponding to (-) to the heater drive circuit 33, so that the output of the sheathed heater 11 corresponds to the data signal for heater output described in -. The duty ratio is controlled so that the

35 to 37 are R-S flip-flops, 38 is an OR circuit, 39 to 61 are AND circuits, and 62 to 66 are inverters. Reference numerals 67 to 89 designate transfer gates, which are rendered conductive only when a "1" signal is received at their gate terminals, allowing signals to pass through. Reference numerals 90 to 93 are trigger circuits, each of which outputs a trigger pulse pt when the human input signal rOJ rises to "1".

94 is a counter for constant time Al11, which uses the clock pulse P1 applied to the clock terminal CK as a timing element, outputs each count as a numerical signal S2, and also outputs the contents of each count as a numerical signal S2, and when the human power applied to the clear terminal CL rises. It is configured to initialize the count contents. 9
5 to 99 are memory circuits, and among these, memory circuits 95 to 9
8 is the corresponding transfer gate [)7.68.69
．． Each time 71 is turned on and new data is input, the data is sequentially updated and stored.

Further, the storage circuit 99 initializes the memory contents when the input to the clear terminal CL rises, and stores the manual numerical value for the input terminal (■) at that time when the input to the preset terminal PR rises. The stored contents are output from the output terminal Q as a numerical signal S3. 100 to 106 are comparison circuits,
These compare each human power for input terminals A and B, and A>
Outputs a “1” signal when B, and outputs “0” when A≦B.
Output a signal. 107 and 108 are subtraction circuits, which subtract the manual numerical value for input terminal C from the manual numerical value for input terminal C, and send the results of each subtraction to numerical signals S4 and S!, respectively. , output as .

Reference numeral 109 denotes a constant multiplication circuit, which multiplies the numerical signal S3 from the storage circuit 99 by a predetermined constant, for example "0°5", and outputs the multiplication result as a numerical value S7.

Here, the start switch 16 and the stop switch 1
7 is turned on, a start pulse Pa and a stop pulse Pb consisting of a "1" signal are output, respectively, and when the selection switches 18 to 22 are turned on, a start pulse Pa and a stop pulse Pb are output from each of the selection switches 18 to 22. Similarly, a selection pulse PC consisting of a "1" signal is output. 110 is an extraction amount setting circuit provided to receive each selection pulse Pc from the selection switches 18 to 22 at input terminals 11 to 15; Input terminal 11 given
It is configured to latch the state in which a "1" signal is output from the output terminals Ql to Q5 corresponding to I5.

Reference numeral 111 denotes a constant storage unit that stores constants for determining the mill operation time of the mill mechanism 1, and in this case, the constants are actually selected according to the number of coffee beans to be fed to the mill. In this embodiment, for convenience of explanation, it is assumed that, for example, a constant of 12 (seconds) is stored. Reference numeral 112 denotes a constant period ↑, O1 section which stores constants necessary for terminating the drying operation (this will be described later) in the heating pipe 12. , when the water inside has completely evaporated! 7! For example, 150 degrees C corresponding to the detected R4 degree by the 4 degree sensor 14)
A constant is memorized. 113, 114, and 115 are constant storage units that store constants corresponding to predetermined temperature values for arithmetic processing;
('C), 65 Constants corresponding to ('C) are stored. 116 to 132 are the output control circuits 3;
4 is a constant storage section which stores a predetermined constant given as a data signal for heater output;
Each constant within the range from 100 (W) to 1000 (W) as shown in the figure is stored.

Note that the above-mentioned AND circuit 46. Inverter 65°66,
Comparison circuits 105 and 106 and constant storage sections 114 and 115
Accordingly, a circuit 133 is configured for the detected temperature rank, and includes three output lines L, , L2 .
L3 is provided.

Further, an output holding circuit 134 is constituted by the AND circuit 44.1, the transfer gate 88, and the constant storage section 132, and the transfer gate 137.68°70.1
-Riga circuit 92. The memory circuits 95, 96, 99, the comparison circuits 103, 104, and the constant multiplication circuit 109 perform hW 1j3E on the change point detection means 135 in the present invention, and R
-S flip-flop 36.1-Lance flip-flop-h71
．． The 1-trigger circuit 93 and the memory circuit 98 constitute a current measurement circuit 136. Furthermore, 137 is a control means, and this control means 137 has a circuit 133, an output control circuit 34 . AND
Circuits 42.43, 45.47-61. Inverter 63°64, transfer gates 72-87, 89. It is composed of a trigger circuit 91 and constant storage sections 116 to 131.

Next, the operation of the above structure will be explained with reference to FIGS. 4 to 6. The timing chart in FIG. 4 includes the temperature TX detected by the temperature sensor 14 (corresponding to the temperature of the hot water generating portion of the heating pipe 12), the output from the set output terminal TQ of the R-S flip-flop 35, and the comparison circuit 101. output from the AND circuits 40 and 41, output from the output terminal Q of the memory circuit 99, output from the set output terminal Q of the R-S flip-flop 36.37, AN
The changing states of the outputs of the D circuits 44, 45, and 43 and the output of the sheathed heater 11 are shown in correspondence with their respective codes. The timing chart in FIG. 5 also shows that the clock pulse P 1 +P2 + from the pulse generation circuit 29
P3 and the output timing of the carry pulse P4 from the counter 30 are shown, and the temperature characteristic curve diagram in FIG. 6 shows the temperature TX detected by the temperature sensor 14 also shown in FIG.
Three types of change states are displayed using the temperature TC of the water in the water storage tank 8 as a parameter.

Now, when brewing coffee liquid, first store coffee grounds for the number of cups (number of people) corresponding to the coffee liquid meter to be extracted in the drip case 2, and also store the required amount of water in the water storage tank 8. supply. Also, at this time, the selection switches 18 to 22 corresponding to the number of brewed cups are turned on, and when the selection switch 18 corresponding to "1 cup" is turned on,
Since a "1" signal is output from the output terminal Q1 of the extraction m setting circuit 110, the AND circuits 47 to 49 which receive this "1" signal at one input terminal output the input signal (line Ll, (output of L2+L3) is allowed to pass. Also, "2 cups" to "5 cups"
When the selection switches 19 to 22 respectively corresponding to are turned on, "1" signals are output from the output terminals Q2 to Q5 of the extraction amount setting circuit 110, respectively, and therefore the AND circuits 50 to 52 and 53 to 55 .56 to 58. Each group of 59 to 61 inputs the human input signal (line L) to the other input terminal.
1. L2. The output of L3) is selectively allowed to pass through X11.

Then, when the start switch 16 is turned on at time t1 in FIG. 4, the R-S flip-flop 35 is set by the star I pulse Pa output in response to this, and the R-S flip-flop The memory circuits 36 and 37 are reset, and the memory contents of the memory circuit 99 are cleared. ”(The R-S flip-flop 35 is set and its set output terminal Q
When a "1" signal is output from the trigger circuit 90 that receives this "1" signal, a trigger pulse Pc is outputted, and the count contents of the counter 94 are initialized by the trigger pulse Pt. In the state where the counter 94 is initialized in this way, its output, that is, the numerical signal S2 is zero, so in the comparison circuit 101, each input of the input terminals A and B is A<B (A-0, 8 -12 (constant stored in the constant storage unit 111)), and a “0” signal is output, and as a result, “1” is inverted by the inverter 62 to one input terminal of the AND circuit 40 ” signal is given. Since the other input terminal of this AND circuit 40 is given the "1" signal from the cell i/output terminal Q of the R-S flip-flop 35, the AND circuit 40 outputs a "1" signal. This "1" signal is given to the motor drive circuit 32. Then, the relay switch 24 is turned on by the motor drive circuit 32, and in response, the motor 4 is energized and the mill mechanism 1 is driven.
Grinding of the coffee beans stored in the drip case 2 is then started. Also, when the start switch 16 is turned on, the signal from the R-S flip-flop 35 is
1'' signal at one input terminal, the AND circuit 39 allows the human input signal (i.e., IHz clock pulse Pt) to pass through to the other input terminal, so that the counter 94 changes from the deactivated state to 1 second. The count of the counter 94 (numerical signal S2) therefore indicates the elapsed time since the start switch 16 was turned on, that is, the duration of the mill operation.

Then, at time t2, which is 13 seconds after time t1 when the start switch 16 was turned on, the input terminals A and B of the comparator circuit 101 become A>B, so the comparator circuit 101 outputs "1". A signal is output. Then, the output of the AND circuit 40 is inverted to a "0" signal, so
The motor drive circuit 32 turns off the relay switch 24, thereby cutting off the power to the motor 4 and ending the milling operation. Also, at this time, the AND circuit 4
1, the R-S flip-flop 35
Since the ``1'' signal from the ``1'' signal and the ``1'' signal from the comparator circuit 101 are applied, the AND circuit 41 outputs the ``1'' signal.

In short, when the start switch 16 is turned on, the time (actually is 1 from the above memory constant
mill operation (longer by seconds) is performed,
The "1" signal output from the AND circuit 41 at time t2 corresponds to a signal indicating that the milling operation has ended.

Note that when the stop switch 17 is turned on during the mill operation, the R-S flip-flop 35 is reset by the switch I/tub pulse pb outputted by turning it on, so that the output of the AND circuit 40 becomes r.
In response to the QJ signal, the motor drive circuit 32 turns off the relay switch 24, and as a result, the mill operation is stopped midway.

Therefore, the drip operation is performed after time t2. That is, at time t2, "1" is output from the AND circuit 41.
” signal is output, the “1” signal is output to the AND circuit 4.
3, 44, and 45 input terminals. At this time,
In the three-person type AND circuit 44, the "0" signal from each set output terminal Q of the R-S flip-flop 36 and 37, which was reset when the start switch 16 was turned on, is applied to each remaining input terminal. Inverter 64°63 respectively
Since it is inverted and given to the “1] signal, “
1'' signal is output and applied to the gate terminal of the transfer gate 88. As a result, the transfer gate 88 becomes conductive, so that the constant [500 (W)j] stored in the constant storage section 132 is given to the output control circuit 34 as a heater output data signal. Then, the output control circuit 34 intermittently turns on the triac 25 via the heater drive circuit 33 by intermittently outputting a "1" signal at a cycle according to the manually inputted constant r500(W)J. Then, turn on the sheathed heater 1.
1, the current is energized while controlling the duty ratio so that the output corresponds to the constant r500(W)J. In this way, the output holding circuit 134 holds the output of the sheathed heater 11 at a constant value (500 W) set in advance in the constant storage section 132 at the beginning of energization of the sheathed heater 11.

When the sheathed heater 11 is energized and generates heat, the water flowing into the heating pipe 12 from the water storage tank 8 is heated at its arcuate portion 13 and turned into hot water, and the hot water is pushed by the boiling pressure. The hot water is then dripped into the drip case 2 from the hot water supply spout 7, thereby performing a dripping operation.

By the way, in a coffee maker that employs a 9TF4 configuration as in this embodiment, the water from the water storage tank 8 is sequentially turned into hot water in the heating pipe 12. Depending on the height of the water, the time it takes for the water to become boiling water will vary greatly. That is, FIG. 6 shows how the temperature of the hot water generating portion of the heating pipe 12 (temperature TX detected by the temperature sensor 14) changes over time when the sheathed heater 11 is continuously generating heat at a constant output. Set the water temperature TC as a parameter (
35°C, 20°C, 5°C).

In this FIG. 6, point C1 and point bl on the time axis.

Point C1 corresponds to the point at which the generated hot water begins to be pushed down by the boiling pressure (the point at which hot water supply is started), and the detected temperature TX rises relatively rapidly up to the point at which hot water supply starts. After this, it decreases slightly and settles down to a constant value. Also, in Figure 6, point a2 on the time axis +
Point b2 and point C2 are points at which most of the water in the water storage tank 8 has become boiling water and the temperature in the heating pipe 12 begins to rise rapidly (
point A and point B on the temperature axis
point.

The 0 point indicates the detected temperature TX corresponding to the a1 point, b1 point, and C1 point.

As is clear from FIG. 6, the point in time when hot water supply to the drip case 2 is started can be detected by detecting the point in time when the rate of change in the detected temperature TX slows down. In addition, the detected temperature TX at the point in time when hot water supply starts in response to energization of the sheathed heater 11 and the time ΔF from the start of hot water supply until the end of hot water supply (corresponding to the required time for hot water supply and hence the extraction time) are It changes depending on the water temperature TC.

In this case, the detected temperature T at the time of starting hot water supply
There is a water temperature T between X and the temperature TC of the water in the water storage tank 8.
Since there is a certain correlation that the lower C is, the lower the detected temperature TX is, the water temperature TC can be indirectly detected based on the detected temperature TX at the start of hot water supply. As mentioned above, since the required time ΔF for hot water supply decreases depending on the water temperature TC, if the drip operation is performed with the output of the sheathed heater 11 constant, the water will not be supplied into the water storage tank 8. Since the extraction time of the coffee liquid varies depending on the temperature of the water, a problem arises in that it is not possible to extract a delicious and constant taste of the coffee liquid. Furthermore, even if the brewing time of the coffee liquid differs in size, it is desirable that the extraction time does not change much regardless of the amount extracted.
In such a case, the amount of water supplied to the water storage tank 8 will naturally vary in size, so if the sheathed heater 11 is configured to generate heat at a constant output, the time required for hot water supply and the extraction time will vary. ” This will cause the same problems as double series. In addition, in FIG. 6, the hot water supply period (al-a2, bl-b2).

The reason why the detected temperature rx T X during each period of Cl=C2 differs depending on the water temperature TC is that the temperature sensor 145 is provided at a position near the water storage tank 8 in the arcuate portion 13 of the heating vibrator 12. This is because it is easily influenced by the water temperature TC in the water storage tank 8.

Now, in this embodiment, the detection of the start point of hot water supply to the drip case 2 and the solution of the problems mentioned in -1- are performed as described below.

That is, the transfer gate 67 is connected to the pulse generation circuit 29
The gate terminal receives a clock pulse P2 which is outputted at a period of 1 second from the temperature signal 51 (71μ degree sensor 14 (corresponds to the detected temperature TX)
pass. Therefore, a new detected temperature TX is sequentially updated and stored in the memory circuit 95 every 1 second. Further, the transfer gate 68 receives at its gate terminal a clock pulse P1 with a period of 1 second, which is output from the pulse generation circuit 29 with a delay of time τ (see FIG. 5) from the clock pulse P2. It becomes conductive every second and allows the detected temperature TX stored in the memory circuit 95 to pass. Therefore, the detected temperature TX is sequentially updated and stored in the storage circuit 96 at the next stage with a delay of time τ from the storage circuit 95.

As a result, the delay time τ between clock pulses P2 and 21
In the period corresponding to , there is a time difference of 1 second in the sampling time of each detected temperature TX stored in the storage circuit 95.96. Then, in the subtraction circuit 108, the input to the input terminal C (detection from the memory circuit 95?
The human power (detected from the memory circuit 96?AAIfTX) on the input terminal -J'D is subtracted from the input terminal -J'D, and the subtraction result is output as a numerical signal S5. Therefore, the numerical signal S5 output during the period corresponding to the delay time τ between the clock pulses P2 and Pi is the detected temperature T in 1 second.
This corresponds to the −increase value of X, and this numerical signal S5
is applied to input terminal A of comparison circuit 103, input terminal B of comparison circuit 104, and input terminal l of storage circuit 99.

The memory circuit 99 (lie, it is initialized at the above time tl, so in the current use it is in a state where the numerical value 0 is stored,
A numerical signal S3 corresponding to the stored numerical value is applied from the output terminal Q to the input terminal B of the comparator circuit 103. At this time,
Since the detected temperature TX is increased after time t2 when the sheathed heater 11 starts being energized, the input terminal A of the comparator circuit 103.

Each input to B always has a relationship of A>B, and therefore a "1" signal is output from the comparison circuit 103. Then, the trigger circuit 92 that receives the "1" signal outputs the trigger pulse pt and applies it to the preset terminal PR of the memory circuit 99, so the memory circuit 99 updates the numerical signal S at that point. will be remembered. After this, during the period when the detected temperature TX is rising, the trigger pulse pt is output from the trigger circuit 92 in the same way as in the case of the double series, and the storage operation of the new numerical signal S5 is repeated in the storage circuit 99. It is something that can be done. In other words, the memory circuit 99 newly stores the numerical signal S5 only when a numerical signal S5 larger than the memory value of the association regulations (1:) is input, and as a result, the memory circuit 99 outputs The numerical signal S3 corresponds to the maximum increase value of the detected temperature TX in one second up to the point in time when the numerical signal S3 is output.

The numerical signal S from the storage circuit 99 is multiplied by rO,5J by a constant multiplier circuit 109, resulting in a numerical signal S6.
This numerical signal S6 is applied to the input terminal A of the comparison circuit 104.

The output of the comparison circuit 104 is configured to pass through a transfer gate 70, and the gate terminal of the transfer gate 70 is supplied with a signal from the pulse generation circuit 29 for a period corresponding to the delay time τ between the clock pulses P2 and P21. Clock pulse P3 output at a period of 1 second at
(See Figure 5). Therefore, the comparison operation of the comparison circuit 104 is performed during the period when the transfer gate 70 is in a conductive state due to the clock pulse P3.
In other words, the numerical signal S output from the subtraction circuit 108 is 1
It is enabled only during the period corresponding to the J:yf value of the detected temperature TX in seconds. Then, during the period in which the comparison operation of the comparison circuit 104 is enabled, when the numerical signals S5 and S have a relationship of Ss>S,
In other words, at time t3 in FIG.
Pressure of hot water (hot water supply) using boiling pressure + 114 pressure is started in 2, and the rate of change of detected temperature TX (temperature increase gradient) is started.
becomes slower, and as a result, when the temperature 1-rise value of the detected temperature TX in 1 second becomes less than 1/2 of the maximum increase value in 1 second of the detected temperature TX stored in the memory circuit 99, The comparison circuit 104 outputs a rate-of-change slowing signal S consisting of a "1" signal. In this way, the change point detection means 135 detects the time point when the rate of change of the temperature TX detected by the temperature sensor 14 slows down (the time point when hot water supply starts) and outputs the rate of change slowdown signal So. At this time, since the transfer gate 70 is in a conductive state as described above, the rate of change slowing signal So passes through the transfer gate 70 and is applied to the set input terminal S of the R-S flip-flop 36. This sets the R-S flip-flop 36. In FIG. 4, the rate of change of the detected temperature TX becomes negative at time t3, but this is because the mounting of the temperature sensor 14 is related to the position.
is located near the center of the arcuate portion 13 of the heating vibrator 12, the influence of the temperature TC of the water in the water storage tank 8 is reduced and the rate of change of the detected temperature TX at time t3
Since the degree of blunting in is reduced, the constant in the constant multiplier circuit 109 is set accordingly.

At time t3, when the change rate slowing signal SO is output as described above and the R-S flip-flop 36 is set, a trigger is generated from the trigger circuit 93 that receives the "1" signal from the set output terminal J'Q. Since the pulse pt is output, the trigger pulse Pt causes the transfer gate 7 to
1 exhibits a conductive state. Then, the detected temperature TX stored in the storage circuit 95 passes through the transfer gate 71 and is stored in the storage circuit 98. In this manner, the temperature measurement circuit 136 detects the rate of change slowing signal S. The detected temperature TX is measured at the time when is outputted (the time when hot water supply is started), and the measurement result is stored in the storage circuit 98.

In this case, as mentioned above, there is a certain correlation between the detected temperature TX at the time when hot water supply starts and the temperature TC of the water in the water storage tank 8, such that the lower the water temperature TC, the lower the detected temperature TX. Therefore, the detected temperature TX stored in the storage circuit 98 corresponds to the water temperature TC,
As a result, the temperature measurement circuit 136 detects the water temperature T in the water storage tank 8.
C will be detected indirectly.

Furthermore, when the "1" signal is output from the R-S flip-flop 36 at the time t3, the "1"
The signal is inverted to rOJ signal by inverter 64 and A
Since the signal is applied to the ND circuit 44, the output of the AND circuit 44 is inverted to a "0" signal, and the transfer gate 88, which had been in a conductive state until then, is switched to a cutoff state.

At the same time, a "1" signal from the AND circuit 41 (.), a "1" signal from the inverter 63 and a "1" signal from the R-S flip-flop 36 are input to each input terminal of the AND circuit 45 of the three-person type Since the "1" signal is applied, its output is inverted to the "1" signal, and the transfer gate 89, which receives this "1" signal at its gate terminal, becomes conductive.

This allows each constant stored in the constant storage units 116 to 130 to be selectively input to the output control circuit 34 as a heater output data signal.

On the other hand, as described above, when any of the selection switches 18 to 22 corresponding to the number of brewing cups is turned on, the AND circuits 47 to 49.50 to 52.5 are
Any group from 3 to 55, 56 to 58, and 59 to 61 is on line 1. ,．． 1. ,,.

It is in a state where the output of L3 (the detected temperature rank is the output from the circuit 133) is allowed to pass through. Therefore, when extracting one brew of coffee liquid, any one of the constants stored in the group of constant storage units 116 to 118 is selectively used as the heater output data signal. Similarly, in each case of extracting coffee liquid for 2 to 5 times, constant storage units 119 to 121, 122 to 124, 125 to 1 are used as heater output data signals.
Any one of the constants stored in the groups 27, 128 to 130 is selectively used. The selection of constants from each group of the constant storage units 116 to 130 is performed as described below based on the output of the circuit 133 for the detected temperature 1 which receives the output from the temperature measurement circuit 136.

That is, the detected temperature TX stored in the storage circuit 98 at the time t3 has a property of becoming longer as the temperature TC of the water in the water storage tank 8 is lower. is given as comparative human power to each input terminal A of . In this case, the detected temperature TX stored in the storage circuit 98 is below 60'C (
In other words, in a state where water level 11 and meng TC are relatively low), each input of input terminals A and B in the comparator circuit 105 satisfies A≦B (
B is given the constant "60" stored in the constant storage section 114), and a "0" signal is outputted to the input terminal A of the comparator circuit 106.

Each human power of B becomes "0" because A<B (B is given the constant "65" stored in the constant storage unit 115).
The signal is now output, so line L! ,L2
．． A "1" signal is output only to line L1 of L3. Furthermore, when the detected temperature TX exceeds 60°C and is below 65°C (state where the water temperature TC is medium), the comparison circuit 105
Since the "1j signal is outputted from the line L2 and the rOJ signal is outputted from the comparison circuit 106, the "1j signal is outputted only from the line L2.
” signal will now be output. Furthermore, the detected temperature TX
When the water temperature TC exceeds 65°C (the water temperature TC is relatively high), the "1" signal is output from both comparison circuits 105 and 106, so the "1" signal is output only to the line L3. Become.

Therefore, the detected temperature TX at the start of hot water supply, or TX660℃
When there is a relationship, the AND circuit 47 is connected from the line L.
, 50.53, 56.59. Therefore, depending on the output state from the extraction amount setting circuit 1'lO, either the two-leg AND circuit 47.50°53.56.59 A “1” signal is output from one, and the transfer gate? Of 2, 75.7g, and 81.84, the one corresponding to the AND circuit exhibits a conductive state. Also, 60℃<T
When there is a relationship of X≦65°C, from line L2 to AN
Since the "1" signal is given to the D circuits 48, 51, 54, 57, 60, the upper 3 HA N D circuits 4g, 51°, 54, 57.
When a "1" signal is output from any one of the AND circuits 60, one of the transfer gates 73, 76, 79, 82, 85 corresponding to the AND circuit becomes conductive. Furthermore, when there is a relationship of 65° C. Leg AND circuit 49, 52, 55° 58.
When a "1" signal is output from any one of the A N D circuits 61, one of the transfer gates 7'4, 77, 80, 83, and 86 corresponding to the A N D circuit becomes conductive.

In the following manner, the number of extraction cups selected by the extraction amount setting circuit 110 and the detected temperature TX at the start of hot water supply are determined as follows.
(and therefore the height of the water in the water storage tank 8)
One of the transfer gates 72 to 86 becomes conductive depending on the level of Output control circuit 3 via transfer gate 89 which is in a conductive state at
4 and 11 as the heater output data signal. Then, in the output control circuit 34, the duty ratio is controlled so that the output of the sheathed heater 11 becomes a value corresponding to a manually inputted constant such as "double series", and thereby the output of the sheathed heater 11 is adjusted to the water storage tank. The humidity of the water in the container 8 is changed according to the TC and the extracted coffee liquid magnet. In this case, the storage constants of each constant storage section 116 to 130 are used to control the sheathed heater 1 with an output corresponding to the storage constant.
A value is stored in advance such that the time required to supply hot water when heat is generated is approximately constant regardless of the temperature TC of water in the water storage tank 8 and the amount of extracted coffee liquid.

That is, as each of the above memory constants, temperature all constant circuit 1
When the temperature measured by 36 is high, in other words, when the temperature TC of the water in the water storage tank B indicated by the detected temperature TX at the start of hot water supply is low, the output of the sheathed heater 11 becomes large and the IL rises. A value is stored such that the output of the sheathed heater 11 increases as the amount of extracted coffee liquid increases, and thereby the time required for hot water supply between times t3 and t4, and therefore the extraction time, increases depending on the temperature of the water in the water storage tank 8*. T
It is designed to be constant regardless of the c and extracted coffee wave meter.

In this way, the output of the sheathed heater 11 is controlled by the control means 1.
The drip operation is performed in a state adjusted by 37, and as the drip operation progresses, the water in the water storage container 8 is consumed and most of the water flows into the heating vibrator 12. When it runs out, the temperature TX detected by the temperature sensor 14 suddenly rises by 1. in this case,
The transfer gate 69 receives at its gate terminal the carry pulse P4 output from the counter 3θ at a 10-second cycle, and passes the detected temperature TX from the memory circuit 95 every 10 seconds, and this detected temperature TX is transmitted to the memory circuit. 97 and are sequentially updated and stored. Therefore, in the subtraction circuit 107,
Subtract the input to input terminal C (temperature TX detected 10 seconds ago from memory circuit 97) to input terminal C (temperature TX detected 10 seconds ago from memory circuit 97) to input terminal C;
The subtraction result is output as a numerical signal S4. Therefore,
This numerical signal S4 is 1f above the detected temperature TX for 10 seconds.
This numerical signal S4 corresponds to 7 values, and this numerical signal S4 is compared with a storage constant (5° C.) in a constant storage section 113 in a comparison circuit 102. And, as mentioned above, there is almost no water in the heating pipe 12! Is it detected that the drip operation has been terminated? ++A Ik T , when the increased value exceeds 5° C., a “1” signal is output from the comparator circuit 102 and applied to the A N D nii path 42 . This AN
The other input terminal of the D circuit 42 is given the "1" signal from the set output terminal Q of the R-S flip-flop 36, and therefore, at time ta, the "1" signal from the AND/D circuit 42 is applied. A trigger pulse pt is output from the received trigger circuit 91, and the R-S flip-flop 37 is set by this trigger pulse Pt. Then, the output of the AND circuit 45, which had been outputting a "1" signal, becomes "0".
'' signal, the transfer gate 89 is cut off, and the output of the AND circuit 43 is inverted to the "1" signal, thereby causing the transfer gate 87 to cease being conductive.

Therefore, after time t4 when the drip operation is completed, the constant (100(
W)) is now given to the output control circuit 34, and the sheathed heater 11 starts to perform a drying operation in which heat is generated at an output of 100W, and the remaining inside the heating pipe 12 Water evaporates slowly,
The occurrence of strange odors, rust, etc. caused by residual water is prevented.

In addition, during the drying operation after the drip operation is completed, the sheathed heater 11 generates heat with a relatively low output of 100W, and as a result, a small amount of moisture remaining in the heating pipe 12 rapidly evaporates, causing the hot water supply opening to evaporate. A large amount of high-temperature steam will no longer be ejected from 7, and the danger of burns and the like caused by the ejected steam will be prevented.

Then, at subsequent time t5, when the detected temperature TX indicated by the temperature signal S exceeds the temperature 150'C for ending the drying operation stored in the constant storage section 112, the input terminal A of the comparison circuit 100 , B have a relationship of A>B, and a "1" signal is output from this. Then, the R-S flip-flop 35 is reset and the output of the AND circuit 41 is inverted to a "0" signal, and accordingly, the output of the AND circuit 43, which had been outputting a "1" signal, also becomes "0". ” signal, the transfer gate 87 is switched to the cut-off state, and accordingly, the input of the data signal for heater output to the output control circuit 34 is stopped, thereby causing the sheathed heater 1
1 is cut off and the drying operation is ended.

Furthermore, when the stop switch 17 is turned on during the drip operation and drying operation, the R-S flip-flop 35 is reset by the stop pulse pb output in response to the turn-on, and the A-S flip-flop 35 is reset in response to the stop pulse pb.
Since the output of the ND circuit 41 is inverted to a "0" signal and the AND circuits 43, 44 and 45 block the passage of the signal, the transfer gates 87, 88 and 89 are held in a cut-off state and the sheathed heater 11 The power is cut off, and the drip operation and drying operation are stopped midway.

According to the present embodiment described above, the point in time when hot water supply to the drip case 2 starts is the rate of change slowing No. 16 S. This change rate slowing signal So
Based on the control of coffee liquid extraction time as mentioned in the example? + Of course, there are things that can be obtained, such as l♀ rinsing of coffee powder (controlling the stirring operation), display indicating that hot water supply has started, and locking the lid 2a of the drip case after hot water supply has started.

It is also possible to control the operation of a mechanism to prevent the bottle 10 from being removed after hot water supply has started. Moreover,
In this case, one temperature sensor 14 provided to detect the temperature of the hot water generating portion of the heating pipe 12 is used.
Since the temperature TC of the water in the water storage tank 8 is also indirectly detected, the overall structure can be simplified.

Further, according to this embodiment, the time required for hot water supply, that is, the time for extracting coffee liquid, depends on the water temperature TC in the water storage tank 8.
Regardless of the time, the preset time is approximately constant, so it is possible to extract delicious coffee liquid that always has a constant taste. Furthermore, in the above embodiment, since the required time for hot water supply is determined based on the detected temperature surface TX at the time when the water supply is started, the rating of the sheathed heater 11 may vary, or Even if the pressure fluctuates, there is an advantage that the pressure is kept constant between - and 1.1+ and 17.

In the embodiment described in L, the temperature measured by the 71V degree measuring circuit 136 is classified into three ranks by the circuit 133 according to the detected temperature ranks, but the ranking may be further divided into multiple stages, and the extraction is performed by the setting circuit. 110 is also not limited to the five-stage setting. Further, in the embodiment described in -1-, the temperature sensor 14 is provided at a position near the water storage tank 8 in the arcuate portion 13 of the heating vibrator 12, but it is not necessarily necessary to provide it at such a position. . However, L
When the above configuration is adopted, since the water temperature TC in the water storage tank 8 is likely to influence the temperature TX detected by the temperature sensor 14, the temperature TC at time t3 (rate of change slowing signal S) in FIG.

is output and the R-S flip-flop 36 is set), the degree of change in the detected temperature TX increases, and as a result, the rate of change signal S becomes slower. The key point is that the output timing becomes accurate and the extraction time can be controlled reliably.

Furthermore, the storage constants of the constant storage units 111 to 132 are "-
Of course, the invention is not limited to the named embodiment.

Further, in each of the above embodiments, the output of the sheathed heater 11 is adjusted by duty ratio control, but other means such as phase control means may be used.

In addition, the present invention is not limited to the embodiment shown in the drawings; for example, other means may be adopted as the change point detection means, and various other means may be used without departing from the gist thereof. It can be modified and implemented.

[Effects of the Invention] According to the present invention, as is clear from the above explanation, the water supplied from the water storage tank is turned into hot water in the heating pipe, and the hot water is pushed up by the boiling pressure to store the coffee grounds. In a coffee extractor that extracts coffee liquid by dripping it into a drip case, the excellent effect is achieved in that the point at which hot water starts to be supplied to the drip case can be detected with a simple structure.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a block diagram of the electrical configuration, Fig. 2 is a partially cutaway side view of the coffee extractor, and Fig. 3 is a side view of the coffee extractor. The bottom view, FIG. 4, and FIG. 5 are timing charts for explaining the action, and FIG. 6 is a starting degree change characteristic diagram for explaining the action. In the figure, 1 is a mill mechanism, 2 is a drip case, 7 is a hot water supply body, 8 is a water storage tank, 11 is a sheathed heater, 12 is a heating vibrator, 14 is a temperature sensor (temperature detection means), 16 is a start switch, 17 is a stop switch, 18-22
is a selection switch, 34 is an output control circuit, 110
is the setting circuit for extraction, 133 is the circuit for the detected temperature rank,
134 is an output holding circuit, 135 is a change point detection means, 13
6 is a temperature measuring circuit, and 137 is a control means. Applicant Toshiba Corporation Figure 2 Figure 3 Figure 5

Claims (1)

[Claims] 1. A heating pipe into which water from a water storage tank flows, and a drip case in which the water in this heating pipe is turned into hot water and the hot water is pushed up by boiling pressure to store coffee grounds. In a coffee extractor equipped with a heater, the temperature detection means is provided to detect the temperature of the heating pipe, and the point at which the rate of change in the temperature detected by the temperature detection means slows down after the start of energization of the heater. and a change point detection means for detecting the change rate and outputting a change rate slowing signal. 2. The coffee brewer according to claim 1, wherein the temperature detection means is configured to detect the temperature at a position near the water storage tank in the heating pipe.