JPS6343085B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coffee maker configured to automatically shift from a coffee bean milling operation by a milling mechanism to a hot water supplying operation by a hot water supply mechanism, and which is equipped with a buzzer for notification. The purpose of this is to enable the ringer to sound ideally without causing discomfort to the user, and to reliably prevent the milling mechanism from operating inadvertently using a simple circuit configuration. The objective is to provide a coffee brewer that has the following effects.

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

1 is a lid switch, which is configured to be turned on only when the lid of the case (none of which is shown), which is used for both grinding coffee beans and extracting coffee liquid, is properly set in a predetermined position. The lid switch 1, the heater 2, the bimetal switch 3 as a temperature switch, and the output switch 4a of the heater drive circuit 4, which will be described later, are connected in series in this order between both output terminals 5a and 5b of the AC power source 5. A heater circuit A is constituted by these series circuits.
Then, a series circuit of a mill motor 6 and an output switch 7a of a motor drive circuit 7 to be described later is connected in parallel with the series circuit of the heater 2, bimetal switch 3, and output switch 4a. In this case, motor 6
is attached to a mill mechanism (not shown), and the mill mechanism has a cutter rotated by a motor 6 in the case, and grinds coffee beans stored in the case by rotation of the cutter to produce coffee. Produces powder. Further, the heater 2 is attached to a hot water supply mechanism (not shown), and the hot water supply mechanism converts water supplied from a water storage tank to the heater into hot water using the heater 2, and lowers the boiling pressure of the hot water thus generated. The coffee liquid is extracted by supplying the coffee powder into the case containing the coffee powder. Furthermore, the bimetal switch 3
is a normally closed type that is turned off when the heater reaches a predetermined temperature. On the other hand, 8 is a DC power supply circuit for rectifying the output of the AC power supply 5 and providing it as a power source for a control circuit 9, which will be described later. Only 8a is shown. 10 is the heater circuit A
This is a detection circuit for determining the state of the circuit, and this will be described below. That is, the common connection point of the heater 2 and the bimetal switch 3 in the heater circuit A constitutes a signal extraction point 11, and this signal extraction point 11 is connected to the PNP in the detection circuit 10 via a resistor 12.
It is connected to the base of the type transistor 13. Then, the emitter of the transistor 13 is connected to the output terminal 5b of the AC power supply 5, and the collector of the transistor 13 is connected to the low potential side (zero potential side) output line 8a of the DC power supply circuit 8 via the resistor 14,
Furthermore, a parallel circuit of a resistor 15 and a diode 16 is connected between the base and emitter of the transistor 13. Then, the collector of the transistor 13 forming the output end of the detection circuit 10 is connected to the line _L1 .

Now, the configuration of the control circuit 9 will be described below. In this case, most of the functions of the control circuit 9 can be obtained by a program of a microcomputer, but here, for convenience of explanation, a combination of block circuits will be described. It is shown with. That is,
A frequency divider 17 divides the frequency of the output of the AC power supply 5, and outputs a counting pulse Pc at a period of, for example, 1 Hz. Reference numeral 18 denotes a set switch that is turned on only in the manual operation state, and a high level signal is applied to one input terminal of the AND circuit 19 only when this switch is turned on. The other input terminal of the AND circuit 19 is connected to receive the counting pulse Pc, and therefore, the AND circuit 19 passes the counting pulse Pc only during the ON period of the set switch 18. For example, 20 is a hexadecimal up counter, which is the clock input terminal from the AND circuit 19.
It adds and counts the pulses input to CK and outputs the counted contents as a digital signal Sn. 21 is, for example, 3 consisting of a 7-segment light emitting diode, etc.
digit digital display, this is the digital signal
When Sn is received through the transfer gate 22, a numerical value (for example, two digits at most) corresponding to the digital signal Sn is displayed. The transfer gate 22 has a configuration that exhibits low impedance and allows the signal to pass only when a high level signal is input to its control terminal 22a, and the other transfer gates described below have the same configuration. be. Reference numeral 23 denotes a storage section that stores an information signal Sd for displaying a predetermined mode, and the information signal Sd is input to the digital display 21 when the transfer gate 24 is in a conductive state. When the information signal Sd is input to the digital display 21, the digital display 21 displays, for example, "LId" as shown in FIG. On the other hand, 25 is a start switch that is turned on only in the manual operation state, and when this is turned on, a high level signal is given to one of the input terminals of the 3-input type AND circuit 26. 27
is also a stop switch that is only turned on during manual operation, and when it is turned on, the line
A high level signal is output to _L2 . 28 has its set input terminal S connected to the output terminal of the AND circuit 26, and its reset input terminal R connected to the line.
The output from the set output terminal Q of the R-S flip-flop connected to _L2 is the delay circuit 29.
is applied to one input terminal of an AND circuit 30 through the line, and also directly applied to one input terminal of an AND circuit 31 serving as gate means, and the other input terminal of the AND circuit 31 is connected to the line. Connected to _L1 . At this time, the delay time of the delay circuit 29 is set to, for example, about 20 ms. The output terminal of the AND circuit 30 located after the delay circuit 29 is connected to the control terminal 22a of the transfer gate 22 via an inverter 32, and is also directly connected to the control terminal 24a of the transfer gate 24. By such a connection, the transfer gate 22
is conductive when a low level signal is output from the AND circuit 30, and the transfer gate 24 is
It is configured to be conductive when a high level signal is output from the AND circuit 30. 33 has its set input terminal S connected to the output terminal of the AND circuit 31, and its reset input terminal R connected to the line.
An R-S flip-flop connected to _L2 , the output from its set output terminal Q is connected to the inverter 3.
4 to the other input terminal of the AND circuit 30 and directly to the monostable multivibrator 35 which outputs a high level signal for a short time when receiving a rising signal, and also via a delay circuit 36. It is also applied to one input terminal of the AND circuit 37. 38 is a down counter having a preset function and a clear function. When a digital signal is input to its data input terminal D, this down counter presets a numerical value corresponding to the input digital signal, and also when a pulse is input to the clock input terminal CK. The count is subtracted from the preset value each time it is input, and the count is cleared to "0" when a high level signal is input to the clear terminal CL. Furthermore, this down counter 38 is configured to output a high level signal only during a period when its count value is other than "0", and operate the motor drive circuit 7 with this high level signal, so that the motor drive circuit 7 is operated. When the circuit 7 is operated in this way, its output switch 7a
Turn on. Further, the data input terminal D of the down counter 38 is connected to the output terminal P of the up counter 20 via the transfer gate 39, the clock input terminal CK is connected to the output terminal of the AND circuit 40, and the clear input terminal CL is connected to the output terminal P of the up counter 20. Connected to the line _L2 . One input terminal of the AND circuit 40 is connected to receive the counting pulse Pc, and the other input terminal is connected to the output terminal P of the down counter 38. In addition, the control terminal 3 of the transfer gate 39
9a is connected to receive the output from the monostable multivibrator 35. Further, the output terminal P of the down counter 38 is branched into two after passing through an inverter 41, and is branched into two, and the output terminal P of the down counter 38 is branched into two branches.
7, and is connected to each input terminal of AND circuit 2.
The remaining input terminals of 6 are connected via the inverter 42.
It is connected to the output terminal of the AND circuit 37. Further, the output terminal of the AND circuit 37 is connected to one input terminal of the AND circuit 44 via a delay circuit 43 having a delay time of, for example, about 10 ms.
The other input terminal of the AND circuit 44 is connected to the line _L1 . 45 is a D flip-flop whose data input terminal D is connected to a high level signal source 46, whose clear input terminal CL is connected to line _L2 , and whose clock input terminal CK is connected to the output terminal of AND circuit 44. . 47 is a monostable multivibrator which is a timer means which outputs a high level signal for only a predetermined period in response to the rise of the output of the D flip-flop 45 to a high level signal; It is applied to one input terminal of the AND circuit 49 and also directly to the buzzer drive circuit 50. This buzzer drive circuit 50
The buzzer 5 is a ringer that notifies the completion of extraction of coffee liquid only during the period when a high level signal is input.
Sound 1. On the other hand, the AND circuit 49 is connected to give its output to the heater drive circuit 4, and this heater drive circuit 4 is operated during the period when the high level signal is input, turning on the output switch 4a. This is a configuration that allows still,
The other input terminal of the AND circuit 49 is the AND circuit 37
Also, a delay circuit 36 and an AND circuit 3 are connected to the output terminal of
7 and the inverter 41, the first
The delay circuit 42 and the AND circuit 44 constitute a second signal generating means 53 according to the present invention.

Next, the operation of this embodiment having the above configuration will be explained. When producing coffee liquid, an amount of water corresponding to the desired number of people is supplied into the water storage tank of the hot water supply mechanism, and with the corresponding amount of coffee beans stored in the case, the lid is placed on the case. A bottle for storing coffee liquid is placed on the heater of the hot water supply mechanism. Then, in this state, coffee beans are first milled. In this case, when the set switch 18 is turned on and kept in the on state, the count pulse Pc from the frequency divider 17 is given to the up counter 20 via the AND circuit 19, which adds and counts the count pulse Pc. The content of the count is then output as a digital signal Sn. At this time,
As will be clear from the description below, since the AND circuit 30 outputs a low level signal and the transfer gate 22 is conductive, the digital display 2
1 will now receive the digital signal Sn,
Therefore, on the digital display 21, the numerical values corresponding to the digital signal Sn are "0" → "1" → "2".
→ "3"... will be displayed in increasing numbers, so
The operator can display any number such as "12".
When this happens, the on operation of the set switch 18 is released. When the ON operation of the set switch 18 is released in this way, the high level signal is no longer input to the AND circuit 19, and the AND circuit 19 blocks the passage of the counting pulse Pc.
The up counter 20 stops the counting operation, stores the count value "12" as the count result, and outputs a digital signal Sn corresponding to the count value "12". Therefore, at this time, the digital display 21 continues to display "12". After this, when the start switch 25 is turned on, in this case, as will be understood from the description below, a high level signal is output from the inverters 41 and 42, so a high level signal is output from the AND circuit 26, and this high level signal is output from the AND circuit 26. The R-S flip-flop 28 which receives the signal at its set input terminal S is set and outputs a high level signal from its set output terminal Q. However, in such a state, if the lid of the case is not properly set at the predetermined position, the lid switch 1 is off, and the output switch 4a is also off, so the signal extraction point 11 is turned off. Since the base current serving as the detection current is not applied to the base of the transistor 13,
The transistor 13 is in an off state. Therefore, a low-level signal corresponding to the potential of the low-potential side output line 8a of the DC power supply circuit 8 is output to the line _L1 , and the AND circuit 31 continues to output the low-level signal. Accordingly, the R-S flip-flop 33 also maintains the reset state and outputs a low level signal from its set output terminal Q. As mentioned above, when a high level signal is output from the R-S flip-flop 28, the high level signal is passed through the delay circuit 29.
is applied to one input terminal of the AND circuit 30, and R- is applied to the other input terminal of the AND circuit 30.
Since the low level signal from the S flip-flop 33 is applied via the inverter 34, a high level signal is output from the AND circuit 30 and the transfer gate 24 becomes conductive. Then, the information signal Sd from the storage section 23 is input to the digital display 21, and this is "LId".
(See FIG. 2) will be displayed to notify that the lid is not properly set.
Incidentally, when the start switch 25 is turned on with the lid not properly set, the monostable multivibrator 35 is driven because a high level signal is not output from the R-S flip-flop 33 as described above. Therefore, the transfer gate 39 maintains a non-conducting state. Therefore, the digital signal Sn is not input to the data input terminal D of the down counter 38, and the down counter 38 continues in its initial state, that is, the state in which its count value is "0" and it outputs a low level signal. Therefore, the output switch 7a is not turned on by the motor drive circuit 7, and the non-conducting state of the motor 6 is maintained. That is, the milling operation will not be started unless the lid is properly set. On the other hand, when the case lid is properly set in the predetermined position, the lid switch 1 is on and the output switch 4a is off, so that every half wave period when the output terminal 5b side of the AC power source 5 is at a high level. A base current is supplied from the signal extraction point 11 to the transistor 13, and the transistor 13 is turned on periodically according to the frequency of the AC power supply 5. Therefore, a detection signal Sa consisting of an intermittent high level signal is outputted to the line _L1 by turning on and off the transistor 13. Therefore, if the lid is not properly set and the start switch 25 is turned on, and then the lid is reset normally based on the display "LId" on the digital display 21 as described above, and the lid is When the start switch 25 is turned on in a normally set state, a high level signal is input to both input terminals of the AND circuit 31, and this AND circuit 31 outputs a high level signal, so that the R-S
Flip-flop 33 is set and a high level signal is output from its set output terminal Q. Then, the monostable multivibrator 35 driven by this high level signal outputs a high level signal for a short period of time to make the transfer gate 39 conductive, so that the digital signal Sn stored in the up counter 20 becomes the data of the down counter 38. is applied to the input terminal D, and the down counter 38
presets the numerical value "12" corresponding to the input digital signal Sn, and outputs a high level signal from the output terminal P to operate the motor drive circuit 7. This turns on the output switch 7a and energizes the motor 6, which rotates the cutter and starts grinding the coffee beans in the case.
At the same time, a high level signal is applied to one input terminal of the AND circuit 40, and the AND circuit 40 receives a high level signal.
Since the counting pulse Pc applied to the other input terminal of the circuit 40 passes through this, the down counter 38, which receives the counting pulse Pc at its clock input terminal CK, starts a subtraction counting operation. Such a subtraction counting operation is started with the preset value "12" as a reference, and the counted value is sequentially decreased from "12" to "11" to "10", and so on. When the count value of the down counter 38 reaches "0", a low level signal is output from the output terminal P instead of a high level signal, so the motor drive circuit 7 is stopped and its output is When the switch 7a is turned off, the motor 6 is cut off and grinding of the coffee beans is completed, and at the same time, the AND circuit 40 is turned off and the input of the counting pulse Pc to the down counter 38 is stopped. Therefore, the time it takes for the count value of the down counter 38 to go from "12" to "0" is 12 seconds because the output cycle of the count pulse Pc is 1 Hz, and therefore the time required for the count value of the down counter 38 to go from "12" to "0" is 12 seconds. The time (mill time) is controlled to 12 seconds. As mentioned above, when a high level signal is output from the set output terminal Q of the R-S flip-flop 33, the high level signal is inverted by the inverter 34 and input to the AND circuit 30.
0 comes to output a low level signal, therefore, the transfer gate 22 becomes conductive and the digital display 21 comes to display the numerical value "12" corresponding to the digital signal Sn from the up counter 20. Furthermore, since the R-S flip-flop 28 in the reset state is outputting a low level signal before the start switch 25 is turned on, this low level signal is received via the delay circuit 29.
The AND circuit 30 outputs a low level signal as described above. Furthermore, the delay circuit 29
Since the detection signal Sa outputted to _L1 is an intermittent high level signal, it is provided to compensate for this.

Now, when the milling operation is completed as described above, the operation automatically shifts to the dripping operation. That is, when the down counter 38 outputs a low level signal and the milling operation is completed, the inverter 41 that has received the low level signal outputs a high level signal, and this high level signal is sent to the AND circuit 37.
is applied to one input terminal of . At this time, AND
A high level signal is input to the other input terminal of the circuit 37 via the delay circuit 36 at the time when the high level signal is output from the flip-flop 33 (in other words, at the time when the milling operation is started). Therefore, as a result, the AND circuit 37 generates an operation command signal consisting of a high level signal in place of the previous low level signal at the same time as the milling operation is completed.
Sb is now output, and this operation command signal Sb
is applied to one input terminal of an AND circuit 44 via a delay circuit 43, and also directly applied to the other input terminal of an AND circuit 49. In this case, at the moment the operation command signal Sb is output from the AND circuit 37,
One input terminal of the AND circuit 44 (delay circuit 43
Since a low level signal is applied to the input terminal (connected to The monostable multivibrator 47 is also in a non-driven state and outputs a low level signal, and the inverter 48 receiving this outputs a high level signal. Therefore, the moment the operation command signal Sb is output from the AND circuit 37, the AND circuit 49 that receives it outputs a high level signal, so the heater drive circuit 4 is operated and the output switch 4a is turned on, thereby turning on the heater. 2
becomes energized and generates heat. When the output switch 4a is turned on in this way, the base current is no longer supplied to the base of the transistor 13 from the signal take-out point 11, and the transistor 1
3 is turned off, a low level signal is output to line L ₁ instead of the detection signal Sa, and therefore the AND connected to line L ₁
A low level signal is now applied to the input terminal of the circuit 44. Here, the delay time of the delay circuit 43 is longer than the delay time from the time when the operation command signal Sb is output from the AND circuit 37 to the time when the output switch 4a is turned on and a low level signal is output to the line _L1 . The operation command signal Sb is set to be long, for example, 10 ms, and therefore the operation command signal Sb is output from the AND circuit 37.
At the time when is output, the delay action of the delay circuit 43 prevents a situation in which high level signals are input to both input terminals of the AND circuit 44 at the same time. Due to this action, the D flip-flop 4
5 is performed while maintaining the initial state. Now,
As described above, when the heater 2 is energized and generates heat, the water in the heater supplied from the water storage tank flows into the heater 2.
The hot water thus produced is supplied into the case by its boiling pressure and extracted as coffee liquid, and the extracted coffee liquid is poured into the bottle placed on the heater. The water is stored downstream. When all the water in the water storage tank is consumed by such coffee liquid extraction or dripping operation, the temperature of the heater will rise rapidly due to no heat exchange between the heater and the water. The bimetal switch 3 detecting this turns off and the heater 2 is cut off, thereby completing the dripping operation. When the dripping operation is completed as described above, that is, when the bimetal switch 3 is turned off, the signal output point 11 is connected to the base of the transistor 13.
The base signal is then applied again, turning on the transistor 13, and the detection signal Sa is again output to the line _L1 . Then,
Since a high level signal is input to both input terminals of the AND circuit 44, the AND circuit 44 outputs a trigger signal Sc consisting of a high level signal.
The D flip-flop 45 is triggered and outputs a high level signal, and in response, the monostable multivibrator 47 outputs a high level signal for a predetermined period. Therefore, the buzzer drive circuit 5
0 is turned on for a predetermined period and the buzzer 5 is turned on during this period.
1 sounds to notify that the dripping operation has been completed. Furthermore, during the period when the buzzer 51 sounds,
That is, while the monostable multivibrator 47 is outputting a high level signal, the high level signal is inverted to a low level signal by the inverter 48 and input to the AND circuit 49.
A low level signal is output from the AND circuit 49, and the operation of the heater drive circuit 4 is temporarily stopped. After the above-described dripping operation is completed, the bimetal switch 3 is intermittently turned on and off to control the heater 2 to be turned on and off, and the coffee liquid in the bottle is kept warm by the heater. To stop such heat retention, the stop switch 27 is turned on. Then, the R-S flip-flops 28 and 33, the down counter 38, and the D flip-flop 45 are all reset or cleared by the high-level signal outputted to the line _L2 by this ON operation, and especially the R-S flip-flop 33. As a result of the reset, a low level signal is input to the AND circuit 37 and the output of the operation command signal Sb is stopped, so a low level signal is output from the AND circuit 49 at the subsequent stage, and the heater drive circuit 4
The operation of the heater 2 is stopped, and the heater 2 is cut off, that is, the heat retention is stopped. Furthermore, if the stop switch 27 is turned on during the above-described dripping operation, the heater 2 is similarly cut off and the dripping operation is stopped midway. Furthermore, when the stop switch 27 is turned on during mill operation, the count value of the down counter 38 is cleared to "0" and a low level signal is output from now on, so the motor drive circuit 7 is stopped. The motor 6 is cut off, and the mill operation is stopped midway. In addition, delay circuit 3
Reference numeral 6 indicates that at the start of the mill operation, that is, at the moment when a high level signal is output from the R-S flip-flop 33, high level signals are simultaneously input to both input terminals of the AND circuit 37, and the operation command signal Sb is output from the AND circuit 37. This is provided to prevent a situation in which a message is output by mistake.

According to the present embodiment described above, the buzzer 51 that sounds when the extraction of coffee liquid is completed is controlled to have a certain period of time by the monostable multivibrator 47, and the monostable multivibrator 47 is Since the configuration is such that the D flip-flop 45, which stores and retains the set state when set, is driven when set.
The buzzer 51 sounds only once when the extraction of coffee liquid is completed. Therefore, although the configuration is such that the completion of extraction of coffee liquid is detected by turning off the bimetal switch 3, the buzzer 51 sounds every time the bimetal switch 3 is intermittently turned off, or after the bimetal switch 3 is turned off. long time buzzer 51
There is no risk that the sound will continue to ring, and the user will not feel uncomfortable. Furthermore, according to the present embodiment, the bimetal switch 3 serves as the basis for determining the ON state of the lid switch 1 in the heater circuit A, the ON operation timing of the output switch 4a, and the coffee liquid extraction completion notification.
Since the off-operation timing of the sensor can be determined by only one detection circuit 10, the circuit configuration can be simplified. Since the structure is provided with an AND circuit 31 that allows the start of energization of the motor 6 (start of mill operation) only when the detection signal Sa is output from the detection circuit 10, the mill operation of the mill mechanism is changed to the hot water supply operation. With a simple circuit configuration, it is possible to reliably prevent situations that occur inadvertently during and after the hot water supply operation is completed. Furthermore, if the input section of the control circuit 9 that receives the output of the detection circuit 10 is configured with a microcomputer, one input port can receive three types of input signals, so the remaining input port can be used for other functions. The functions of the control circuit 9 can be further diversified.

According to the present invention, as described above, it is possible to ideally make the alarm sounder sound without causing any discomfort to the user, and to prevent the situation where the milling operation of the milling mechanism is performed inadvertently by using a simple circuit. It is possible to provide a coffee maker that exhibits effects such as being able to reliably prevent such problems through its configuration.

[Brief explanation of the drawing]

FIG. 1 is an electrical configuration diagram showing an embodiment of the present invention, and FIG. 2 is a front view showing an example of a state of a digital display in the embodiment. In the figure, 2 is a heater, 3 is a bimetal switch (temperature switch), 4a is an output switch, 5 is an AC power supply, 10 is a detection circuit, 21 is a digital display,
31 is an AND circuit (gate means), 44 is an AND circuit, 45 is a D flip-flop, 47 is a monostable multivibrator (timer means), 51 is a buzzer (sounder), 52 is a first signal generating means, and 53 is a first signal generating means. This is the second signal generating means.

Claims (1)

[Claims] 1. A mill mechanism that grinds coffee beans, and a hot water supply mechanism that supplies hot water generated by a heater using a heater as a heat source to the coffee powder generated by this mill mechanism, and the mill operation by the mill mechanism is completed. In the coffee maker, the coffee maker automatically starts the hot water supply operation by the hot water supply mechanism when the hot water supply mechanism finishes the hot water supply operation; an output switch that is turned on to start energizing the heater when a command signal is output; a temperature switch that is turned off when the temperature of the heater exceeds a predetermined value to cut off the power to the heater;
a detection circuit that generates a detection signal when at least one of the output switch and the temperature switch is turned off; a gate means that allows the mill mechanism to start a milling operation only when the detection signal is output; a second signal generating means for generating a trigger signal when the detection signal is output after the operation command signal is output; and a timer means for executing a timer operation for a certain period of time when the trigger signal is output. , and a ringer which rings during the timer operation period of the timer means.