JPS6311124A - Coffee brewer - 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] Industrial applications The present invention relates to a coffee brewer.

BACKGROUND OF THE INVENTION Conventionally, coffee brewers have been known in which a mill mechanism for grinding coffee beans and a drip mechanism are integrated, and the operation is automatically switched to drip operation after grinding the coffee beans.

That is, as shown in FIGS. 5 and 6, the coffee boiler includes a container 1 in which a coffee bean grinding chamber and a filtration chamber for extracting coffee liquid and separating the extracted liquid and residue are integrated. The container 1 is equipped with a cutter 3 that is rotationally driven by a motor 2, a filter 4 at the bottom for separating the extract and the residue, and a main body 5.
is equipped with a timer 7 that controls the operating time of the motor 2 and automatically switches from energizing the motor 2 to energizing the heater 6 after the operation is completed, and a switch 8 that starts energizing the motor 2. ing.

In the above configuration, when the timer 7 is set to the "mill" position and the switch 8 starts energizing, the coffee beans are ground by the cutter 3, and then the drip function is automatically performed. The water stored in the tank 9 is introduced into the water pipe 11 formed integrally with the heater 6 through the reverse valve 1°, and the water is heated by the heater 6, causing the steam pressure generated to cause hot water to flow. Hot water is pushed up and guided to a discharge pipe 11' located above the container 1, and hot water is poured into the container 1 from this discharge pipe 11' to extract coffee liquid, and the coffee is poured into a glass container 12. This is where liquid is stored.

Furthermore, when the timer 7 is set to the "drip" position and the switch 8 is operated, only the above-described drip function is performed.

Fig. 7 shows a specific circuit diagram of the same. 13 is a thermostat, and this thermostat 13 controls its own operating temperature (hereinafter referred to as "adjustment temperature") and the temperature to which it itself is subjected (hereinafter referred to as "measurement temperature"). ON1 depending on temperature (referred to as “temperature”)
If the measured temperature is lower than the adjusted temperature, the heater 6 is turned on, and if it is higher than the adjusted temperature, the heater 6 is turned off. Note that the circuit diagram in the frame 3 is the circuit diagram during the drip operation.

Problems that the invention aims to solve Now, when making a large amount of coffee continuously, when the dripping process is finished, the extracted coffee liquid is transferred to another container, and the process is repeated again by adding fresh coffee beans and water. However, when we examine the actual usage in this case, we find that
When repeating this process, people often forget to fill the tank 9 with water.

In order to perform the drip operation in such a state, when the timer 7 is set to the "drip" position and the switch 8 is operated, the heater 6 is energized and heated, resulting in a so-called dry firing state. As a result, various parts within the main body were heated abnormally and their shapes were deformed, which was a major cause of failure. In other words, the temperature change of the water in the tank 9 during the drip operation is as shown in FIG. It is heated and the temperature gradually rises. When heated and reaching boiling temperature, steam is generated, and the steam pressure pushes up the hot water and guides it to the discharge pipe 11', where coffee is extracted. While this continues, the temperature is maintained at approximately the boiling temperature.Then, when the supply of hot water from the discharge pipe 11' is almost finished and the water is dripping, the temperature rises again due to the heating from the heater 6. When the predetermined temperature is reached, the heater is turned off.In other words, when the drip operation is completed, the temperature is higher than the boiling temperature. In some cases, the heater 6 is energized and becomes dry-fired. If such dry-heating occurs, not only will it waste power, but it will also cause significant deterioration of each component, resulting in failure. There were problems such as.

The object of the present invention is to provide a coffee boiler that solves these problems.

Means for Solving the Problems In order to solve the above-mentioned problems, the coffee boiler of the present invention has a tank provided in the main body and containing water, a water pipe for guiding the water in the tank, and a water pipe for directing the water. A heater that heats, a temperature sensing element that detects the temperature near the heater, a heater energization control means that controls energization of the heater, and a drip mechanism that supplies hot water to coffee grounds and extracts coffee liquid;
A drip start temperature setting means for setting the temperature at which the heater is energized, a time measuring means for measuring the time from the start of the drip, and a drip start capable for setting a limit value of the time measured by the time measuring means. a time setting means, a display element that displays that the drip state has entered;
Each output signal of the temperature sensing element, the drip start temperature setting means, the 5-hour measurement means, and the drip start possible time setting means is inputted, and based on these information, the heater energization control means receives a heater energization signal or a prohibition of heater energization. signal,
On the other hand, the display element is configured with a comparison means for outputting a display drive signal or a display drive inhibition signal.

Effect According to the above configuration, when the temperature detected by the temperature sensing element is higher than the temperature set by the drip start temperature setting means (this is taken as the predetermined temperature in FIG. 8) at the time of starting drip, the temperature is switched to the heater. Since no current is applied, it is possible to prevent dry firing during repeated use.

Further, even if the temperature is high at the start of dripping, if the detected temperature falls within the time set by the drip startable time setting means, the heater is energized and the drip operation can be performed. Furthermore, by driving the display element even when the heater is not energized, the user can easily understand that the energization is not due to a failure.

Embodiment Hereinafter, one embodiment of the present invention will be explained based on the block diagram shown in FIG. In FIG. 1, parts that perform the same operations as in FIGS. 6 and 7 are designated by the same reference numerals, and their explanations will be omitted here.

In FIG. 1, reference numeral 14 denotes a temperature sensing element that detects the temperature near the heater, and is installed at the position shown in FIG. 6. 15 is heater energization control means for controlling energization of the heater 6; 16;
Reference numeral 17 indicates a drip start temperature setting means for setting the temperature at the start of drip; 17 indicates a time measurement means for measuring the time from the start of drip; 18 indicates a drip start means for setting a set value of the time measured by the time measurement means 17. In the possible time setting means, these three outputs and the output of the temperature sensing element 14 are both input to the comparison means 19, and the comparison means 19 judges and outputs a signal indicating whether or not to energize the heater 6, which controls the heater energization. The information is input to the means 15. 20 is a notification device such as a buzzer, and 21 is a display element indicating that the drip state has entered.

In addition, the drip start temperature setting means 1 in the above embodiment
6. Drip start time setting means 18, time measuring means 17 and comparing means 19 are operated by a microprocessor 22.
The program is processed by

FIG. 2 shows a circuit diagram of a coffee brewer according to an embodiment of the present invention. In addition, in this Figure 2,
Components that perform the same operations as in FIG. 1 and FIGS. 5 to 7 are given the same numbers, and their explanations will be omitted here.

In FIG. 2, 23 is a comparator built into the microprocessor 22, and the voltage at the temperature detected by the temperature sensing element 14 (here, a thermistor) is input to the positive input terminal of the comparator 23, while the negative A voltage at a temperature preset by the drip start temperature setting means 16 is input to the input terminal.
GH'" signal, and conversely, if the temperature is low, a "LOW" signal is output.

Based on this output signal and the information from the time measuring means 17 and the drip start time setting means 18, the microprocessor 22 controls the heater energization control means 16 (here, a relay) 1 the display element 21 (here, a light emitting diode, hereinafter referred to as "
LKD J) and alarm 20 (buzzer here)
It outputs a signal to.

Note that 24 is an oscillator that operates the microprocessor 22, and 25 is a mill display element that indicates that the mill mechanism is in operation.

FIG. 3 shows an outline of the operation of the circuit shown in FIG. 2, and the following description will be made based on this FIG. 3.

In the above configuration, when the timer 7 is set to the "drip" position and the drip operation is started, the LED 21 lights up, the temperature is detected by the temperature sensing element 14, and this detected temperature is set by the drip start temperature setting means 16. It is checked whether the temperature is higher than a preset temperature (hereinafter referred to as "set temperature"). As a result, if the detected temperature is lower than the set temperature, energization to the heater 6 is started, but in the opposite case, the timer, which is the time measuring means 17, is operated. Then, within the time set by the drip start possible time setting means 18 (hereinafter referred to as "set time"), temperature detection by the temperature sensing element 14 is repeated. If the detected temperature becomes lower than the set temperature within the set time, the drip operation will start, but if the detected temperature is still higher than the set temperature even after the set time has passed, the alarm 20 will be activated and an abnormality will occur. At the same time as the notification is made, the LED 21 is turned off. That is, in this embodiment, if the temperature detected by the thermosensor 14 is equal to or higher than the set temperature at the start of dripping, the heater 6 is not energized, and even if the detected temperature is equal to or higher than the set temperature even after the set time has elapsed, the heater 6 is not energized. The configuration is such that an abnormality notification is performed. Conversely, if the detected temperature falls below the set temperature (waiting for cooling) within the set time, the heater 6 is energized.

Note that the start of the drip operation may be set to the ``drift 11 position'' described above and only the drip operation is performed, or the drip operation may be performed after the end of the mill operation. In the above embodiment, the mill mechanism Although the explanation has been given for a coffee boiler equipped with a mill mechanism, it goes without saying that the invention can also be applied to a coffee boiler without a mill mechanism.

Further, in the above embodiment, the LED 21 is turned off when an abnormality is notified, but it may be made to blink, or may be made to blink alternately together with the mil display element 25.

Effects of the Invention As described above, according to the present invention, when the drip is started, if the temperature detected by the temperature sensing element is higher than the temperature set by the drip start temperature setting means, the heater is not energized. Therefore, it is possible to prevent dry firing during repeated use, and therefore, there is no need to waste electricity due to dry firing, and
Failures due to abnormal heating of each component can also be prevented. Also, even if the heater is not energized at the start of drip,
Since the display element indicates "drip" and waits for cooling, the user can easily understand that the heater is not energized due to a malfunction, and therefore has an excellent effect on operability. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a coffee boiler showing an embodiment of the present invention, FIG. 2 is a circuit diagram of the same coffee boiler, FIG. 3 is a flowchart for explaining the operation of the same coffee boiler, and FIG. The figure is a front view of the same coffee boiler, Figure 5 is a front view of a conventional coffee boiler, Figure 6 is a longitudinal sectional view of the same coffee boiler, and Figure 7 is the circuit of the same coffee boiler. 8 are temperature characteristic curve diagrams during dripping. 6... River/main body, 6... Heater, 9...
- Tank, 11... Water pipe, 14... Temperature sensing element, 15... Heater energization control means, 16.
...Drip start temperature setting means, 17...
・Time measurement means, 18... Drip start time setting means, 19... Comparison means, 2o...
...Alarm device, 21...Display element, 22...
...Microprocessor. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Fig. 6-Go-Taro 3 Fig. 4 Fig. 5 Fig. S 6 Fig. 5-Taste) also C・-Heater 9-・Dani j2 +1--Kazuei t 14-Claw, 2nd) ff 14 6 11th 7 Figure 2 = 呵-de-

Claims (2)

[Claims] (1) A tank provided in the main body and containing water, a water pipe that guides the water in the tank, and a heater that heats the water;
A temperature sensing element that detects the temperature in the vicinity of the heater, a heater energization control means that controls energization of the heater, a drip mechanism that supplies hot water to coffee grounds and extracts coffee liquid, and energizes the heater. A drip start temperature setting means for setting the temperature, a time measuring means for measuring the time from the start of the drip, a drip start possible time setting means for setting a limit value of the time measured by the time measuring means, and a drip state. a display element for displaying that the temperature has entered, and a comparison means into which each output signal of the temperature sensing element, drip start temperature setting means, time measurement means, and drip start possible time setting means is input, and from the time of starting drip. Within the set time preset by the drip start possible time setting means, the comparison means outputs a display drive signal to the display element, and within the set time, the detected temperature of the temperature sensing element reaches the drip start time. If the temperature is lower than the set temperature preset by the temperature setting means, a heater energization signal is output to the heater energization control means, and conversely, if the temperature is higher than the set temperature, a heater energization prohibition signal is output, and furthermore, when the set time is reached, If the temperature detected by the temperature sensing element is higher than the set temperature, a drive prohibition signal is output to the display element and at the same time a heater energization prohibition signal is output. (2) An alarm is provided separately from the display element, and when a drive prohibition signal to the display element and a heater energization prohibition signal are output at the same time, the alarm is driven. A coffee brewer according to scope 1.