JPS62189026A - 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 involves boiling water supplied from a water storage tank in a heating pipe, pushing the heat by boiling pressure, and storing coffee grounds. A coffee extractor is designed to extract coffee liquid by dripping it into a drip case, and in particular, after starting to supply hot water into the drip case, the operation of the feeder 1 is interrupted for a predetermined period of time to remove coffee powder. u! This invention relates to a coffee extractor designed to provide moisture.

[Technical background of the invention and its problems As an example of coffee extract, conventionally, a heating pipe is provided whose base end communicates with the bottom of a water storage tank and whose distal end is located above the drip case. There is a structure in which a heater is attached to a midway part of the pipe to heat the water inside the pipe. 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 from the water storage tank into the heating pipe is turned into hot water, and the hot water is pushed up by boiling pressure and drips into the drip case from the tip of the heating pipe. By repeating this operation, all the water in the water storage tank is finally dripped into the drip case. The hot water thus supplied into the drip case, while passing through the coffee powder and extracting coffee extract from it, falls and is stored in the container at the bottom of the drip case. Extraction of coffee liquid takes place.

By the way, when performing such a drip operation, one of the conditions for obtaining delicious coffee liquid is to perform a so-called smearing operation of moistening the coffee grounds at the beginning of hot water supply. For this reason, conventional coffee brewers are configured to turn off power to the heater for a predetermined period of time after a certain period of time has elapsed after the heater starts being energized, thereby interrupting the hot water supply operation for the predetermined period of time after starting hot water supply. 41+ of coffee powder during such interruption period! There is a lot of hydration going on. However, when performing the above-mentioned uneven operation, if the amount of hot water used to moisten the coffee grounds is insufficient or, conversely, excessive, the effect of the moistening will be halved. When the amount of hot water used to moisten the coffee powder is an appropriate amount, a strong and delicious coffee liquid can be obtained.

On the other hand, in the conventional coffee brewer, the heater is turned off after a certain period of time has passed after the heater starts being energized, and the hot water supplied in the drip case until the power is turned off is used to brew coffee powder. Because the structure is configured to perform wetting, there are 1 parts in the drip case depending on the length of time from when the heater starts energizing to when hot water starts being supplied.
(There are circumstances in which the amount of hot water supplied differs. However, the time from when power is turned on to the two-legged heater to when hot water starts to be supplied actually depends on the temperature of the water in the water storage tank,
Initial temperature of the heating pipe and the parts in contact with it.

It varies depending on factors such as power supply voltage and variations in the rated output of the heater, and therefore, the conventional coffee brewer does not serve to moisten the coffee powder. There is a problem in that QQ is not constant, so it is not always possible to obtain the optimum moisturizing effect, and it is not always possible to extract delicious coffee liquid even though the smearing operation is performed.

[Object of the Invention] The present invention has been made in view of the above circumstances, and its object is to control the coffee powder in the drip case at the beginning of hot water supply to the drip case, regardless of the temperature of the water in the water storage tank. Variations in the ratings of hot water generation heaters,
To provide a coffee brewer which can be moistened with an optimum amount of hot water at any time regardless of fluctuations in power supply voltage, and can thereby always obtain delicious coffee liquid.

[Summary of the Invention] In order to achieve the above object, the present invention turns water supplied from a water storage tank into hot water in a heating pipe, and at the same time presses the hot water with boiling pressure and drips it into a drip case. In the so-called drip-type coffee brewer, the time point at which hot water supply to the drip case is started is detected based on the state of temperature change of the heating pipe, and a first set time period elapses from the point at which the hot water supply becomes abrupt. When this occurs, the heater is cut off to end the hot water supply operation, and the temperature of the water in the water storage tank is indirectly increased based on the temperature of the heating pipe at the time hot water supply starts. The configuration is such that control is performed so that the first set time is increased, and as a result, the amount of hot water supplied to moisten the coffee grounds at the beginning of dispensing is approximately constant regardless of the temperature of the water in the water storage tank, etc. It was designed so that

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

FIG. 2 shows the overall configuration of a coffee maker equipped with a mill function and a drip function. In FIG. 2, 1 is a mill mechanism consisting of a cutter 3 disposed inside a drip case 2 which also serves as a mill case, and 4 is a motor for driving this mill mechanism 1. When energized, the cutter 3 is activated. Rotates 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 crushed 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. Further, a diffusion plate 6 with a large number of pouring holes 6a nailed thereto is removably attached to the top opening of the drip case 2, and a hot water supply spout body 7 is mounted above the diffusion plate 6 and rotates horizontally. It is movably installed.

Reference numeral 8 denotes a water storage tank in which water for brewing coffee is supplied, 9 a heating plate on which a bottle 10 is placed, and a sheathed heater 11 and, for example, a metal heating pipe 12 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 pipe 12 is connected to the water storage tank 8 at its base end through a check valve (not shown) at the bottom thereof, and
The tip side is connected to the hot water supply port body 7, and when the sheathed heater 11 is energized and generates heat, water flowing into the heating pipe 12 from the water storage tank 8 flows into the heating pipe 12 (particularly inside the arcuate portion 13). The heated water is heated to generate hot water, and the hot water is pushed up by boiling 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 the coffee powder in the process of passing through the coffee powder in the drip case 2, and then falls and is stored in the bottle 10 via the filter 5. This extracts the coffee liquid.

Now, the heating pipe 12 is largely attached with a temperature sensor 14 as a temperature detecting means, such as a thermistor. In this case, the temperature sensor 14 (above) is provided at a position closer to the water storage tank 8 side in the arcuate portion 13 of the heating pipe 12, and therefore the temperature sensor 14 detects the temperature of the hot water generating portion of the heating pipe 12. can be detected.

15 is an operation panel, which includes a star I switch 16. A stop switch 17 and selection switches 18 to 22 are provided which are selectively turned on depending on the amount of coffee liquid to be extracted (1 to 5 pumps).

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 converted into a rectangular wave/K shape, and a synchronization pulse Ps synchronized with the power supply frequency is outputted, and the output 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 φ1 . φ2. IHz clock pulses P1+p2. whose phases differ by 120 degrees from φ3. p3 (see Figure 5) is output.

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 manually, the relay switch 24 is turned off. 33 is a heater drive circuit which turns on the triac 25 to energize the sheathed heater 11 when the "1" signal is input, and turns off the triac 25 when the rOJ signal is input manually. 34 and 35 are R-S flip-flops, 36 to 38 are OR circuits, 39 to 61 are AND circuits, and 62 to 65 are inverters. Reference numerals 66 to 86 designate transfer gates, which are rendered conductive only when a "1" signal is received at their gate terminals, allowing signals to pass through.

87 to 90 are trigger circuits, and these input signals are "O".
Trigger pulse pt is output when each rises to "1".

91 to 93 are counters for time measurement, which use the clock pulse Pl applied to the clock terminal CK as a time measurement element, and send the count contents to numerical signals S3 and s, respectively.
, +s, and the count contents are initialized when the input to the clear terminal CL rises. Reference numerals 95 to 98 are memory circuits, and among these, memory circuits 94 to 97 sequentially update the data each time the corresponding transfer game 1-66, 67, 69, 10 is turned on and new data is input. In particular, in this case, the memory contents of the memory circuit 97 correspond to the first set time according to the present invention. Furthermore, the memory circuit 98 initializes the memory contents when the input to the clear terminal CL rises, and also stores the input numerical value to the input terminal (■) at that time when the input to the preset terminal 1) H rises. The stored contents are output from the output terminal Q as a numerical signal S6. 99 to 106 are comparison circuits,
Each input to input terminals A and B is compared, and if A>B, a "1" signal is output, and if A≦B, a "0" signal is output. 107 is a subtraction circuit which subtracts the human input value for input terminal C from the input value for input terminal C;
The subtraction results are respectively output as numerical signals S7. 10
A constant multiplication circuit 8 multiplies the numerical signal S6 from the storage circuit 98 by a predetermined constant, for example rO, 5J, and outputs the multiplication result as a numerical signal S8.

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. 1.9 is an extraction amount setting circuit provided to receive each selection pulse Pc from selection switches 18 to 22 at input terminals 11 to I5, and when the selection pulse Pc is input, the selection pulse Pc is Input terminal 11 to which is given
(1) It is configured to latch the state in which a "1" signal is output from the output terminals Q1 to Q5 corresponding to 5.

Reference numeral 110 denotes a constant storage unit that stores constants for determining the mill operation time of the mill mechanism 1; in this case, the constants indicated by - are actually values corresponding to the amount 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 111 denotes a constant storage unit that stores constants necessary for terminating the drying operation (this will be described later) in the heating pipe 12. For example, a constant of 150 (° C.) is stored, which corresponds to the temperature detected by the temperature sensor 14 when most of the moisture has evaporated. Reference numeral 112 denotes a constant storage unit that stores a constant corresponding to a predetermined arithmetic processing time value, in which 60 (seconds), for example, corresponding to the second setting time according to the present invention is written. 113 and 114 are constant 7j+ parts that store constants corresponding to one grade and value for predetermined arithmetic processing, and these include, for example, 60 ('C) and 135 (
'C) are stored. Also, 11
5 is a constant storage section that stores an initial value, for example, 10 (seconds). Reference numerals 116 to 130 are constant storage units that store predetermined constants given as the first set time in the storage circuit 9.7, and these include, for example, values ranging from 10 (seconds) as shown in FIG. Each constant within the range up to 100 (seconds) is stored.

Note that the above-mentioned AND circuit 45. Inverter 64°65,
Comparison circuits 105 and 106 and constant storage units 113 and 114
Accordingly, a circuit 131 is configured for the detected temperature rank, and includes three output lines L1. L2.
L3 is provided.

Also, transfer gates 66, 67, 68. Trigger circuit 88. Memory circuits 94, 95.98. Comparison circuit 10
1, 102 and the constant multiplication circuit 108, the change point detection means 132 (1- is formed), and the heater drive circuit 33 and the AND circuit 44 violate the heater control means 133 (or the heater control means 133). . And OR circuit 37. AND circuit 42, inverter 63.1-rega circuit 89. Counter 92, memory circuit 97 and comparison circuit 10
3 constitutes the first clock means 134 referred to in the present invention, and the AND circuit 43. Counter 93. The comparison circuit 104 and the constant storage section 112 constitute a second clock means 135 in the present invention, and the transfer gate 69 and the memory circuit 98 constitute a temperature measurement circuit 136. Furthermore, 137 is a time control means according to the present invention,
This time control means 137 has a circuit 131. for the detected temperature rank. AND circuits 46-61. Transfer gates 70 to 86, trigger circuit 90, and constant storage unit 115 to
130.

Next, the operation of the above structure will be explained with reference to FIGS. 4 to 6. In addition, the timing chart of FIG. 4 shows the detected two-grade temperature TX by the temperature sensor 14 (corresponding to the temperature of the hot water generating part in the heating pipe 12), the output from the set output terminal Q of the R-S flip-flop 34, and the comparison. Output of circuit 100, output of AND circuits 40 and 41, output from output terminal Q of memory circuit 98, output from set output terminal Q of R-S flip-flop 35, comparison circuit 1
The changing states of the outputs of 03 and 104, the output of the inverter 63, and the output of the AND circuit 44 are shown in correspondence with their respective codes. The timing chart of FIG. 5 also shows clock pulses P1. from the pulse generation circuit 29. P2
．． Each output timing of P3 is shown, and the temperature characteristic curve diagram in FIG. 6 shows the state of change in the temperature TX detected by the temperature sensor 14 also shown in FIG.
Three types are revealed using parameters.

Now, when extracting coffee liquid, first store coffee beans for the number of cups (number of people) corresponding to the amount of coffee liquid 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 amount setting circuit 109, the AND circuits 47 to 49, which receive this "1" signal at one input terminal, output an input signal (line L1. This allows the passage of L2 (output of L3). Also, "2 cups" to "5 cups"
When the selection switches 19 to 22 corresponding to ? are turned on, the output terminals Q2 to ? of the extraction amount setting circuit 109 are turned on.
, Q, each group of AND circuits 50-52. 11'1 selectively allows the passage of the output (output of 11'1).

After that, at time t1 in FIG. 4, when the start switch 16 is turned on, the R-S flip-flop 34 is set by the start pulse Pa output in response to this, and the R-S flip-flop 35 is also set. The counters 92 and 93 and the memory circuit 9
8 is made clear. Therefore, in the comparator circuit 104, each person's power for input terminals A and B is A<B (A-
0°B-60 (constant stored in constant storage unit 112))
B, and a "0" signal is output. Furthermore, at this time, the transfer gate 70 which receives the start pulse Pa at its gate terminal becomes conductive.
Initial value “10 (seconds)” stored in constant storage unit 115
is stored in the storage circuit 97 as the first set time, and the stored value is applied to the input terminal B of the comparison circuit 103. Therefore, even in the comparator circuit 103, its input terminal 1: r-A
, B have a relationship of A<B, and a "0" signal is output. When the R-'S flip-flop 34 is set as described above and a "1" signal is output from its set output terminal Q, a trigger pulse pt is output from the trigger circuit 87 that receives this "1" signal. The count content of the counter 91 is initialized by the trigger pulse P (.When the counter 91 is initialized in this way, its output, that is, the numerical signal S3 is zero, so
In the comparator circuit 100, input terminals A and B each have their own power or A.
B (A-0, B-12 (constants stored in the constant storage unit 110)) and outputs a "0" signal, resulting in a signal being output to one input terminal of the AND circuit 40. An inverted "1" signal is provided by an inverter 62. The other input terminal of this AND circuit 40 is connected to the R-
“1” from the set output terminal Q of the S flip-flop 34
” signal is given, the AND circuit 40 rl
Jfg is now output, and 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 to drive the mill mechanism 1, thereby starting to grind the coffee beans stored in the drip case 2. Furthermore, when the start switch 16 is turned on, the AND circuit 39 which receives the "1" signal from the R-S flip-flop 34 at one input terminal outputs an input signal (i.e. IHz clock pulse Pi) to the other input terminal. The counter 91
starts to count up every second from the initialized state, and therefore the count contents of the counter 91 (numerical signal S3
) indicates the elapsed time since the start switch 16 was turned on, that is, the duration of the mill operation. Then, from time t1 when the start switch 16 is turned on, 13
At time t2, after seconds have elapsed, each input to the input terminals A and B of the comparator circuit 100 becomes A>B, and therefore a "1" signal is inputted from the comparator circuit 100.

Then, since the output of the AND circuit 4o is inverted to the rOJ signal, the relay switch 24 is activated by the motor drive circuit 32.
is now turned off, thereby cutting off the power to the motor 4 and terminating the mill operation.

Also, at this time, since the "1" signal from the R, -S flip-flop 34 and the "1" signal from the comparator circuit 100 are applied to the input terminal of the AND circuit 41,
The AND circuit 41 outputs a "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 34 is reset by the stop pulse pb outputted by turning it on, so that the output of the AND circuit 40 becomes "0".
'' 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.
When the "1" signal is output, the "1" signal is applied to one input terminal of the AND circuit 44 in the heater control means 133. At this time, since the rOJ signal from the comparator circuit 103 is inverted to a "1" signal and is applied to the other input terminal of the AND circuit 44, the AND circuit 44 outputs a "1" signal. is output.

Then, the heater drive circuit 33 that receives the "1" signal turns on the triac 25 continuously, so that the sheathed heater 11 is energized and generates heat at the rated output. When the sheathed heater 11 is energized and generates heat in this way, the water flowing into the heating pipe 12 from the water storage tank 8 is heated at its arcuate portion 13 and turned into boiling water, and the ease of heating is reduced by the boiling pressure. The hot water is pushed up and dripped into the drip case 2 from the hot water supply port body 7, thereby performing a dripping operation.

The transfer gate 66 receives at its gate terminal the clock pulse P2 output from the pulse generation circuit 29 at a period of 1 second, and therefore becomes conductive every 1 second so that the A-D converter circuit 31 A temperature signal 51 (corresponding to the temperature TX detected by the IR degree sensor 14) output from the temperature signal 51 is passed through.

Therefore, a new detected temperature TX is sequentially updated and stored in the memory circuit 94 every 1 second. Further, the transfer game I/67 receives at its gate terminal a clock pulse P1 with a period of 1 second, which is output from the pulse generating circuit 29 with a delay of time τ (see FIG. 5) from the clock pulse P2. Therefore, it becomes conductive every second to allow the detected temperature TX stored in the memory circuit 94 to pass.

Therefore, the detected temperature TX is sequentially updated and stored in the storage circuit 95 at the next stage with a delay of time τ from the storage circuit 94.

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 between the sampling times of each detected temperature TX stored in the storage circuits 94 and 95. Then, in the subtraction circuit 107, the input to the input terminal C (detected temperature TX from the memory circuit 94)
The input to the input terminal (detected temperature TX from the memory circuit 95) is subtracted from the subtracted value, and the subtraction result is output as a numerical signal S7. Therefore, the numerical signal S7 output during the period corresponding to the delay time τ between the clock pulses P2 and 21 corresponds to the increase in the detected temperature TX in 1 second, and this numerical signal S7 is compared Input terminal A of circuit 101
, input terminal B of the comparison circuit 102 and input terminal J'I of the storage circuit 98.

Since the storage circuit 98 is initialized at the time t1, it initially stores a numerical value of zero, and a numerical signal S6 corresponding to the stored numerical value is sent from the output terminal Q to the input terminal B of the comparison circuit 101. given to. At this time, since the detected temperature TX is increased after time t2 when the power supply to the sheathed heater 11 is started, the relationship between the input terminals A and B of the comparator circuit 101 is always A>B, and therefore the comparison A “1” signal is output from the circuit 101. Then, the trigger circuit 8 which received the "1" signal noted in -
Since the trigger pulse Pt is outputted and the remaining value is input to the terminal PR of the storage circuit 98, the storage circuit 98 newly stores the numerical signal S7 at that time. After this, during the period when the detected temperature TX is rising, the trigger pulse pt is output from the trigger circuit 88 in the same manner as described above, and the storage operation of the new numerical signal S7 is repeated in the storage circuit 98. It is. In other words,
The memory circuit 98 stores a numerical signal S larger than the memory value of the association regulation.
7 is manually input, the numerical signal S7 is newly stored, and as a result, the numerical signal S6 output from the storage circuit 98 is the maximum increase in detected temperature TX in 1 second up to the point of output. It corresponds to the value.

The numerical signal S6 from the storage circuit 98 is multiplied by "0.5" by the constant multiplication circuit 108, and becomes the numerical signal S8.
This number 111'1 signal S8 is applied to the input terminal A of the comparison circuit 102.

The output of the comparator circuit 102 is configured to pass through a transfer gate 68.
- The gate terminal of 68 receives a clock pulse P output from the pulse generating circuit 29 at a period of 1 second during a period t corresponding to the delay time τ between the clock pulses P2 and 21.
3 (see Figure 5). Therefore, the comparison operation of the comparison circuit 102 is performed by the clock pulse P
3, the period in which the transfer gate 68 is in a conductive state, that is, the numerical signal S7 output from the subtraction circuit 107
It is enabled only during the period in which the detected temperature TX corresponds to the -increase value in 1 second. Then, during the period in which the comparison operation of the comparison circuit 102 is in effect as described above,
When the relationship between numerical signals S7 and S6 or 88>S7 is reached, in other words, the heating pipe 1 at time t3 in FIG.
2, the boiling pressure starts to push up hot water (hot water supply), and the rate of change (temperature increase gradient) in the detected temperature TX slows down. When the value becomes 1/2 or less of the maximum increase value in one second of the detected temperature TX stored in the storage circuit 98, the comparison circuit 102 outputs a rate-of-change slowing signal S consisting of a "1" signal. It is. In this way, the change point detection means 132 detects the point at which the rate of change in the temperature TX detected by the temperature sensor 14 slows down (the point at which hot water supply starts).
is detected and outputs a change rate slowing signal S,
In short, the change rate slowing signal So indicates the point in time when hot water supply to the drip case 2 is started.

At this time, as described above, the rate of change signal So from the transfer gate 6 passes through the transfer gate 68 and is passed through the set input terminal S of the R-S flip-flop 35.
This sets the R-S flip-flop 35. In addition, in FIG. 4, the rate of change of the detected temperature TX becomes negative at time t3, but this is because the temperature sensor 1
4 is related to the position, and when the 2R degree sensor 14 is located closer to the center of the arcuate portion 13 of the heating pipe 12, the influence of the crystallinity TC of the water in the water storage tank 8 is reduced. As a result, the degree of change in the temperature increase gradient at time t3 becomes smaller, so the constant in the constant multiplier circuit 111 is set accordingly.

Now, as mentioned above, at time t3, the change rate slowing signal S
When the R-S flip-flop 35 is set in response to the output of The temperature measuring circuit 136 which receives the trigger pulse Pt from the circuit 89 at the transfer gate 69 and the time control means 137 which receives the above "1" signal at the AND circuit 46 function as follows.

First, in the time control means 137, when the change rate slowing signal So is output at time t3 and the R-S flip-flop 35 is set, the AND circuit 41 and the “1” signal from the set output terminal Q of the R-S flip-flop 35 (
8 or 1", the output of the AND circuit 46 is inverted to a "1" signal, and the transfer gate 7, which had been in a cut-off state until then, stores each of the One of the constants is selectively inputted as the first set time to the memory circuit 97 in the first timer 134, and the specific details of the selection operation will be described later.

Further, in the first time measurement means 134, the AND circuit 4
2 allows the clock pulse P1 to pass, so that the clock pulse P1 is applied to the clock terminal CK of the counter 92, and at the same time, the trigger pulse pt from the trigger circuit 89 is applied to the clear terminal CL of the counter 92. As a result, the count contents of the counter 92 (numerical signal Sa) correspond to the elapsed time since hot water supply into the drip case 2 was started.

After this, time 1. when the first set time stored in the storage circuit 97 has elapsed. (Actually, the time when one second has passed further than the first set time) is reached, the input terminals A and B of the comparator circuit 103 have a relationship of A>B, and from now on, the input terminals A and B become "1" signals. A first timing signal Stl is output.

Then, this first timing signal Stl is inverted to a "0" signal by the inverter 63, and the first timing signal Stl is
At this time, as mentioned above, since the comparator circuit 104 in the second timer 135 is outputting a "0" signal, the AND circuit 44 in
The output of circuit 44 becomes inverted to a "0" signal. Therefore, the sheathed heater 11 is cut off by the heater drive circuit 33 that receives this "0" signal. In this way,
At the time when the first timing signal Stl is output, the sheathed heater 11 is energized or de-energized, and as a result, from the time when hot water supply to the drip case 2 is started, the first value stored in the memory circuit 97 is At time t4 when the set time has elapsed, the hot water supply operation is stopped, and the coffee grounds in the drip case 2 are moistened (ie, a smearing operation). Therefore, the time required from the time t3 when hot water starts being supplied into the drip case 2 until the time t4 when the hot water supply ends, that is, the continuous time for supplying hot water to moisten the coffee grounds, always corresponds to the first set time. It is something that becomes.

On the other hand, in the temperature measuring means 136, when the trigger pulse Pt is output from the trigger circuit 89 as described above in response to the output of the rate of change slowing signal S, the trigger pulse Pt
As a result, the transfer gate 69 becomes conductive.

Then 1. Detected temperature TX stored in the memory circuit 94
passes through the transfer gate 69 and is stored in the storage circuit 96.

In this way, the temperature measurement circuit 136 detects the temperature at time t3 when the rate of change slowing signal SO is output (the time when hot water supply starts).
The detected temperature TX is measured and the measurement result is stored in the memory circuit 9.
6.

By the way, in the coffee maker that employs the hot water supply configuration as in the present embodiment, water from the water storage tank 8 is sequentially turned into hot water in the heating pipe 12, and therefore, the temperature of the water in the water storage tank 8 varies depending on the temperature of the water in the water storage tank 8. This means that the time it takes for that water to boil will vary greatly. That is, the sixth
The figure 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.
The temperature TC of the water in the water storage tank 8 is set as a parameter (35°C,
20°C, 5°C).

In this Figure 6, point 81 on the time axis and point b1.

Point C1 corresponds to the point at which the boiling pressure of the generated hot water begins to push up (the point at which hot water supply starts), and the detected temperature TX rises relatively rapidly up to the above point, and after this point decreases slightly and settles at a constant value.

In addition, in Fig. 6, 82 points on the time axis, b2 points +
Point C2 corresponds to the point in time when most of the water in the water storage tank 8 is turned into boiling water and the temperature in the heating pipe 12 starts to rise rapidly (the point in time when hot water supply is almost finished), and corresponds to point A, point B, and point 0 on the temperature axis. is the detected temperature TX corresponding to the a1 point, b1 point, and CI point.
This shows that.

As is clear from FIG. 6, the detected temperature TX at the time when hot water supply starts at the time ΔE・l required from the start of energization of the sheath heater 11 to the start of hot water supply is The length changes depending on the water temperature TC. In short, if the output of the sheathed heater 11 is constant during drip operation, the amount of hot water supplied per time lj will vary depending on the temperature TC of the water supplied to the water storage tank 8. This causes a phenomenon in which m Q, which is used for wetting coffee powder, changes. In addition, there is a certain relationship between the detected temperature TX at the start of hot water supply in item 1 and the 2 degrees 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 water temperature TC can be indirectly detected based on the detected temperature TX at the hot water supply start point 11jt. And in this case, to extract a delicious coffee liquid,
Coffee powder In! Is the amount of hot water supplied to the coffee cup suitable or desirable?If the drip operation is performed while the output of the sheathed heater 11 is kept constant, there is a problem that delicious coffee liquid will not be produced due to the above-mentioned phenomenon. evoked. Furthermore, if the amount of coffee liquid extracted is different in size, the amount extracted (amount of coffee powder)
i'Lj L+t subjected to wetting of coffee powder according to
Although it is preferable that the φ changes, even in such a case, the sheath heater 11 should be kept at a constant output to generate φ. If this is done in a vain manner, the amount of hot water used to moisten the coffee powder may be too much or too little, resulting in the same problems as mentioned above. In FIG. 6, the difference between the detected temperature gTx and the water temperature TC during the hot water supply period (each period of al-a2, bl to b2°C1-C2) is that the temperature sensor 14 is connected to the heating pipe 12. It is provided at a position near the water storage tank 8 in the arcuate portion 13, and the water in the water storage tank 8 is This is because it is more easily influenced by MTC.

In this embodiment, the problem of "double series" is solved as described below. The key point is that the time required for the hot water supply period (T3 to t4) for moistening the coffee powder is dynamically changed and set according to the temperature TC of the water in the water storage tank 8 and the amount of coffee liquid extracted. It was designed so that

That is, as described above, when any of the selection switches 18-22 corresponding to the extraction cup is turned on, the AND circuits 47-49, 50-52.5
3 to 55. Either group of 56 to 58 or 59 to 61 is in a state in which the output of lines Ll, L2゜L3 (the detection tolerance is excluded is the output from the circuit 131) passes through li'[ . Therefore, when extracting one brew of coffee liquid, any one of the constants stored in the group of constant storage sections 116 to 118 is selected as the first set time stored in the storage circuit 97. Similarly, in each case of extracting coffee liquid for 2 to 5 times, a constant value is used as the first set time stored in the memory circuit 97. Storage units 119-121, 122-124
, 125-127° and 128-130, the clock pulse P1 is applied to the clock terminal CK of the counter 92, and at the same time Trigger circuit 8
Since the trigger pulse Pt from 9 is given to the clear terminal CL of the counter 92, the counter 9
The count content (number (i°1 signal S4) of 2 corresponds to the elapsed time since the start of hot water supply into the drip case 2. Then, after this, the first set time stored in the memory circuit 97 At time 1 (actually, 1 second has passed after the first set time), the relationship between the input terminals A and B of the comparator circuit 103 becomes A>B, and from now on, A first timing signal Stl consisting of a "1" signal is output. Then, this first timing signal Stt is inverted to a "0" signal by the inverter 63 and is applied to the AND circuit 44 in the heater control means 133. In this case, as mentioned above, the second 3
Since the comparator circuit 104 in the 1 o'clock means 135 is outputting a "0" signal, the output of the AND circuit 44 is inverted to the rOJ signal. Therefore, the sheathed heater 11 is cut off by the heater drive circuit 33 that receives this "0" signal. In this way, the first timing signal Stt
The power supply to the sheathed heater 11 is stopped at the time when is outputted, and the first set time stored in the memory circuit 97 has elapsed from the time when hot water supply to the drip case 2 was started. At this point, the hot water supply operation is stopped, and the coffee grounds in the drip case 2 are wetted (ie, a smearing operation) is performed. Therefore, the time required from the time t3 when hot water supply starts to the time when hot water supply ends in the drip case 2, that is, the continuous time for hot water supply to moisten the coffee grounds, always corresponds to the first set time. This is what happens.

On the other hand, in the temperature measuring means 136, when the trigger pulse P is outputted from the trigger circuit 89 as described above in response to the output of the rate of change slowing signal S, the trigger pulse pt
As a result, the transfer gate 69 becomes conductive.

Then, the detected temperature TX stored in the ta circuit 94
passes through the transfer gate 69 and is stored in the storage circuit 96.

In this way, the temperature al11 constant circuit 136 outputs the rate of change slowing signal S. The detected temperature TX at time t3 (the point in time when hot water supply starts) is output is determined, and the /ll value is determined.
The l+ constant result is stored in the constant connection path 96.

By the way, in the coffee maker that adopts the hot water supply configuration as in this embodiment, the water from the water storage tank 8 is sequentially turned into hot water in the heating pipe 12, and the water in the water storage tank 8 is heated at a height of 21 meters. The time it takes for the water to boil will vary accordingly. 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. The temperature TC of the parameter (35
℃, 20℃, 5℃).

In this Fig. 6, points a1, b1, and 01 on the time axis correspond to the point in time when the pushing by the boiling pressure of the generated hot water starts (the point in time when hot water supply starts), and the detected temperature TX
increases relatively rapidly up to the above-mentioned point, and then decreases slightly and settles at a constant value. Also,
In FIG. 6, at point 82, point b2, and point a2 on the time axis, most of the water in the water storage tank 8 is turned into boiling water and the heating pipe 1
Points A, B, and 0 on the temperature axis correspond to the point in time when the temperature inside 2 starts to rise rapidly (the point in time when hot water supply is almost finished), and points A, B, and 0 on the temperature axis correspond to the point a1 above.
It shows detected temperatures TX corresponding to point B1, point b1, and point C1.

As is clear from FIG. 6, the time ΔE required from the start of energization of the sheathed heater 11 to the start of hot water supply and the detected temperature TX at the time when hot water supply starts are the ii! of the water in the water storage tank 8. It changes in length depending on i u TC. In short, if the output of the sheathed heater 11 is constant during drip operation, the amount of hot water supplied per unit time will vary depending on the temperature TC of the water supplied to the water storage tank 8, and this will change. Due to this, a phenomenon occurs in which the amount of hot water used to moisten coffee grounds changes. Furthermore, there is a certain correlation between the detected temperature TX at the time of starting hot water supply 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. 11! The water temperature TC can be indirectly detected based on the detected temperature TX at the point. In this case, in order to extract delicious coffee liquid, it is desirable that the amount of hot water used to moisten the coffee powder be at an appropriate level, but the drip operation is performed while keeping the output of the sheathed heater 11 constant. If this is done, the problem arises that delicious coffee liquid cannot be obtained due to the above-mentioned phenomenon.

Furthermore, in cases where the amount of coffee liquid extracted varies in size, it is desirable that the amount of hot water used to moisten the coffee powder changes depending on the extraction port (amount of coffee powder). Also, if the sheathed heater 11 is configured to generate heat at a constant output, there may be an excess or deficiency in the amount of 2'JQ provided for Δ1 heating of the coffee powder, causing the same problem as described in 1-1. will be done.

In addition, in FIG. 6, the hot water supply period (al ~ a2, b1
~b2.

Detection raa w T during each period of C1 to C2)
Why does X differ depending on the water temperature TC? , a polishing sensor 14 is provided at a position near the water storage tank 8 in the arcuate portion 13 of the heating pipe 12, and the water storage tank 8
This is because it is more easily influenced by the water temperature TC inside the tank.

In this embodiment, the above-mentioned problems are solved as described below. The key point is that the time required for the hot water supply period (T3-14) for moistening coffee powder is
The settings are automatically changed according to the amount of water in the water storage tank 8), the degree TC, and the amount of coffee liquid extracted.

That is, as described above, when any of the selection switches 18-22 corresponding to the extraction cup is turned on, the AND circuits 47-49, 50-52.5
3 to 55, 56 to 58, and any group from 59 to 61 is in a state where the output of line L1, 1, 2°L3 (the detected temperature rank is the output from circuit 131) passes through π'[ . Therefore, when extracting one brew of coffee liquid, the first set time stored in the storage circuit 97 is set to the li'il time of each constant stored in the group of constant storage sections 116 to 118. Similarly, in each case of extracting coffee liquid for 2 to 5 times, the first one stored in the memory circuit 97 is used.
As the setting time, constant storage units 119 to 121, 122
One of the constants (11) stored in the groups 124, 125-127, and 128-130 is selectively used.

The selection of constants from each group of the constant storage units 116 to 130 is based on the detected temperature TX (as described above, the temperature of the water in the water storage tank 8) stored in the storage circuit 9B in the temperature measurement circuit 136. The detection temperature rank corresponding to IHTC is determined based on the output of the circuit 131 as follows.

That is, the detected temperature TX stored in the storage circuit 96 at the time t3 has the property of becoming lower as the 1M degree TC of water in the water storage tank 8 is lower. Each input terminal A of circuits 105° and 106
It is given as comparative human power. In this case, in a state where the 1H degree value indicated by the detected temperature SX is 60°C or less (that is, a state where the water 9mTC is relatively low), each input of the input terminals A and B in the comparator circuit 105 is A≦B (
A is given the constant "60" stored in the constant storage unit 113), and a "0" signal is output, and in the comparator circuit 106, each of the input terminals A and B becomes A< B (A has the constant r6 stored in the constant storage unit 114)
5J is given), the rOJ signal is output, and 11L becomes the line L1. L2. A "1" signal is output only to line L1 of L3. In addition, when the QFL degree value indicated by the detected temperature TX exceeds 60°C and is below 65°C (state where the water temperature TC is medium), a “1” signal is output from the comparator circuit 105, and the Since the "0" signal is output from the circuit 10B, the "1" signal is output only to the line L2.

Furthermore, in a state where the 1111,1 degree value indicated by the detected temperature TX is around 65°C (a state where the water temperature TC is relatively high), "1" signals are output from both comparison circuits 105 and 106, so the line A "1" signal is now output only to L3.

Therefore, the detected temperature TX at the start of hot water supply is TX≦60°C.
When there is a relationship, the AND circuit 47 is connected from the line L1.
, 50, 53, and 56.59, a signal of "1" is given from any one of the AND circuits 47.50°53.56.59 according to the output state from the extraction amount setting circuit 109. ” signal is output, and the transfer gate 72
, 75, 78, 81, 84, the one corresponding to the AND circuit exhibits a conductive state. Also, 60℃＜TX≦6
When the relationship is 5°C, a "1" signal is given to the AND circuits 48, 51, 54, 57.60 from the line L2, so the AND circuits 48, 51 A "1" signal is output from any one of the AND circuits 73, 76, 79, 82, and 85, and the one corresponding to the AND circuit becomes conductive. Furthermore, 65℃<T
When the relationship is X, the line L3 is connected to the AND circuit 4.
Since a "1" signal is given to the AND circuits 9, 52, 55, 58.61, one of the AND circuits 49.52, 55, 58.61, depending on the output state from the extraction amount setting circuit 109. When the "1" signal is output, the transfer gate 7
Of 4, 77.80, and 83.86, the one corresponding to the AND circuit exhibits a conductive state.

As described above, the number of extraction cups selected by the extraction amount setting circuit 109 and the level of the detected temperature TX at the start of hot water supply (and the level of the temperature TC of the water in the water storage tank 8)
Accordingly, any one of the transfer gates 72 to 86 is in a conductive state, so that the constant stored in any one of the constant storage units 116 to 130 is changed to the time t3 as described above. The signal is applied to the memory circuit 97 as the first set time via the transfer gate 71 which is in a conductive state. The first timer 134 outputs the first timing signal Stt at time t4 when the first set time stored as described above has elapsed. This causes the sheathed heater 11 to be cut off. As described above, the hot water supply period (t3 to ta) for moistening the coffee is changed according to the temperature TC of the water in the water storage tank 8 and the temperature of the extracted coffee. In this case, each constant storage unit 1
As for the memory constants 16 to 130, when the sheathed heater 11 generates heat at the rated output for a period corresponding to the 11 memory constant, the supply 4 Q during the period from time t3 to t4 is the water in the water storage tank 8. of! A! A value that provides the optimum value 1i+'f is stored in advance, regardless of the degree TC and the amount of extracted coffee liquid. That is, "-" each memory constant is temperature 41
11, the lower the temperature measured by the constant circuit 136, in other words, the lower the temperature TC of water in the water storage tank 8 indicated by the detected temperature TX stored in the storage circuit 96, the longer the first set time is. A value is stored in which the first setting time becomes longer as the amount of extracted coffee liquid increases, and the time required for the period from time t3 to t4 is determined by the temperature TC of the water in the water storage tank 8 and the longer the first set time is stored. It changes depending on the amount of extracted coffee liquid. As a result of setting the respective memory constants in the constant memory units 116 to 130 in this way, uJ Eil used for wetting the coffee powder is determined depending on l# IfTC of the water in the water storage tank 8 and the amount of extracted coffee liquid. Regardless, it will always be the best mouth.

On the other hand, at the time t4, the first timing signal St
When l is output, the second 1 o'clock means 135 functions. That is, in the second timer 135, the AND circuit 43 that receives the first timing signal Stl allows the clock pulse P1 to pass, and the counter 93 starts counting. This counter 93
is made bright by the trigger pulse PL from the trigger circuit 89 at time t3, and therefore the count content (numeric signal Ss) is the elapsed time since the sheathed heater 11 was cut off, in other words, the drip case 2 This corresponds to the interruption time of hot water supply operation.

Then, at time t5, when the second set time (60 seconds) stored in the constant storage section 112 has elapsed, the relationship between the input terminals A and B of the comparison circuit 104 becomes A>B. From this, a second timing signal st2 consisting of the rlJ signal is output. Then, the second timing signal st2 is given to the AND circuit 44, so the output of the AND circuit 44 is inverted to a "1" signal, and in response, the heater drive circuit 33 reenergizes the sheathed heater 11. The drip operation is then restarted. In this way, the heater control means 133 operates for a period Ct, up to t5) until the second timing signal st2 is output.
, to maintain the sheathed heater 11 in a power-off state.

After this, as the dripping operation progresses, the water in the water storage tank 8 is consumed and almost no water flows into the heating pipe 12, and the temperature TX detected by the temperature sensor 14 suddenly increases.

Then, at time t6, when the detected temperature TX indicated by the temperature signal S1 exceeds the temperature 150°C for ending the drying operation stored in the constant storage section 111, the input terminals A and B of the comparator circuit 99 Each person's power is in the relationship A>B, and a "1" signal is output from now on. Then, the R-S flip-flop 34 is reset and the AN
I) The output of the circuit 41 is inverted to a "0" signal, and accordingly, the output of the AND circuit 44, which had been outputting a "1" signal, is also inverted to a "0" signal, so that the heater drive circuit 33 As a result, the sheathed heater 11 is cut off, thereby ending the drip operation.

Incidentally, when the stop switch 17 is turned on during the drip operation, the R-S flip-flop 34 is turned on by the stop pulse pb output in response to the turn-on, and the output of the AND circuit 44 is inverted to the rOJ signal. Therefore, the sheathed heater 1 is activated by the heater drive circuit 33.
1 is cut off, and the drip operation is stopped midway.

According to this embodiment described above, the amount of hot water used to moisten the coffee powder in the drip case 2 is optimal regardless of the water temperature in the water storage tank 8 and the extraction of coffee liquid. Therefore, you can always expect the optimum moistening effect and obtain a delicious coffee liquid. Furthermore, in the above embodiment, the water temperature TC in the water storage tank 8 is indirectly detected based on the detected i'R degree TX at the time when hot water supply is started. When the rated output of the heater 11 fluctuates in the lower direction, the water 71! i! TC is detected to be low, and the first set time is controlled so that the time required to supply hot water for coffee powder 1 (11! Stable control can be performed even if the rating of the sheath heater 11 varies.Furthermore, according to this embodiment, the temperature of the hot water generating portion of the heating pipe 12 is Since it is configured to indirectly detect the water l and μTC in the water storage tank 8 by using the 41 degree sensor 14,
The entire structure can be simplified.

In the above embodiment, the temperature measured by the temperature measurement circuit 136 (the temperature detected at the start of hot water supply) is classified into three ranks by the circuit 131 according to the detected temperature ranks.
Furthermore, it may be ranked in multiple stages, and the extraction amount setting circuit 1
09 is also not limited to the five-stage setting. Further, in each of the above embodiments, the temperature sensor 14 is provided at a position near the water storage tank 8 in the arcuate portion 13 of the heating pipe 12, but it is not necessarily necessary to provide it at such a position. However, when the above configuration is adopted, the temperature TC in the water storage tank 8 is likely to be influenced by the temperature TX detected by the temperature sensor 14, so at time 13 in FIG. The degree of change in the detected temperature TX becomes larger at the timing when the R-S flip-flop 35 is outputted and the R-S flip-flop 35 is turned on, and as a result, the rate of change signal S becomes slower.

There is an advantage that the output timing is accurate. Furthermore, it goes without saying that the 1/2 fixed value of the constant storage units 110 to 130 is not limited to the -1/2 pair of each embodiment.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and may be modified in various ways without departing from the gist, such as, for example, other means may be adopted as the change point detection means. It is something that can be implemented.

[Effects of the Invention] According to the present invention, as is clear from the following explanation,
Coffee extraction 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 +tXt pressure and dripped into a drip case containing coffee grounds to extract coffee liquid. At the beginning of hot water supply to the drip case, the temperature of the water in the water storage tank or the rating of the heater for generating hot water may vary.

Regardless of fluctuations in the power supply voltage, the coffee can be moistened with the optimum amount of hot water at any time, and a delicious coffee liquid can always be obtained.

[Brief explanation of drawings]

The drawings show an 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 a coffee extractor, and Fig. 3 is a coffee extractor. The bottom view of the container, FIGS. 4 and 5 are timing charts for explaining the action, and FIG. 6 is a temperature 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 pipe, 14 is a temperature sensor (temperature detection means), 16 is a start switch, 17 is a stop switch, 18-22
is the selection switch, 109 is the extraction amount setting circuit, and 131 is the detection? A4 degree run part is the circuit, 132 is the change point detection means,
133 is a heater control means; 134 is a first time means;
35 is a second time measuring means, 136 is an l'1v degree measuring circuit, and 137 is a time control means. 2nd z 3rd figure 4th

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. A heater to be supplied, a temperature detecting means provided to detect the temperature of the heating pipe, and a change check for detecting a point in time when the rate of change in the temperature detected by the temperature detecting means slows down and outputting a rate of change slowing signal. output means; a first timer for outputting a first timing signal when a first set time has elapsed since the rate of change slowing signal has been output; and after the first timing signal has been output; Second
a second timer that outputs a second timing signal when a set time has elapsed; heater control means for holding the timing signal until the timing signal is output; and control so that the first set time becomes longer as the temperature detected by the temperature detection means is lower at the time when the rate of change slowing signal is output. A coffee extractor characterized in that it is equipped with a time control means. 2. The coffee extractor according to claim 1, wherein the time control means is configured to control the first set time to be longer as the amount of coffee liquid extracted is larger. . 3. The coffee brewer according to claim 1 or 2, wherein the temperature detection means is configured to detect the temperature at a position near the water storage tank in the heating pipe.