JPS6311121A - 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. 2 and 3, the coffee boiler includes a container 1 that integrates a coffee bean grinding chamber and a filtration chamber that extracts coffee liquid and separates the extracted liquid and residue. The parenthetical container 1 is equipped with a cutter 3 which is driven by a motor 2 for one rotation, and a filter 4 at the bottom for separating the extract and the residue. It is provided with a timer 7 that controls 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.

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 check valve 1°, and the hot water is heated by the steam pressure generated when the water is heated by the heater 6. 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. 4 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"). 0N1 depending on temperature (referred to as "temperature")
In other words, if the measured temperature is lower than the adjusted temperature, the heater 6 is turned on, but if it is higher, 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 this state, in order to perform the drip operation, when the timer is set to the "drip" position and the switch 8 is operated, the heater 6 is energized and heated.
As a result, the various parts inside 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. The temperature gradually rises. When the hot water is "heated" and reaches 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 coffee continues to be extracted by supplying hot water from the discharge pipe 11', the temperature is maintained at approximately 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, and when it reaches a predetermined temperature, the heater is turned off.
do. "Extraction" In other words, when the drip operation is finished, the temperature is higher than the boiling temperature, and if you forget to add water to the tank 9 and repeat the drip operation, the heater 6 will be energized and the temperature will be in a dry state. If such dry firing is performed, there are problems such as not only wasting power consumption but also causing significant deterioration of each component, leading to failure.

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;
Drip start temperature setting means for setting the temperature at the start of drip compares the output temperature of the temperature sensing element with the output temperature of the drip start temperature setting means, and the output temperature of the temperature sensing element is the output of the drip start temperature setting means. If the temperature is higher than the temperature, the comparison means outputs a prohibition signal of heater energization to the heater energization control means.

Effect According to the above configuration, if 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. 6) at the start of drip, the heater is Since no electricity is applied, it is possible to prevent dry firing during repeated use.

Embodiment Hereinafter, one embodiment of the present invention will be explained based on the block diagram shown in FIG. Note that in FIG. 1, parts that perform the same operations as in FIGS. 2 to 4 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 6, and is installed at the position shown in FIG. 1
6 is a heater energization control means for controlling energization of the heater 6;
Reference numeral 16 denotes a drip start temperature setting means for permitting the heater 6 to be energized and setting the maximum temperature at the start of drip; the output of the drip start temperature setting means 16 and the temperature sensing element 14 are
Both outputs are inputted to the comparison means 17, and a signal determined by the comparison means 17 and indicating whether or not to energize the heater 6 is inputted to the heater energization control means 16. 18
is an alarm such as a buzzer or lamp.

In the groove formation described above, when the timer 7 is brought into contact with the "drip" position and the drip operation is started, the temperature is detected by the temperature sensing element 14, and this detected temperature is set in advance in the drip start temperature setting means 16. Check whether the temperature is higher than the temperature (hereinafter referred to as "set temperature"). As a result, if the detected temperature is lower than the set temperature, the heater 6 is energized, but if not, the heater 6 is not energized because dry firing will occur, and an abnormality (dry firing) is notified by the alarm 18. . Further, in the above embodiment, the operations of the drip start temperature setting means 16 and the comparison means 17 are programmed by the microprocessor 19.

Note that there are cases in which the start of the drip operation is set to the above-mentioned "drip" position and only the drip operation is performed, and cases in which the drip operation is performed after the mill operation is completed.

Further, in the above embodiment, a coffee boiler equipped with a mill mechanism was explained, but it goes without saying that the present invention can also be applied to a coffee boiler without a mill mechanism. If the temperature detected by the thermosensor at the start of drip is higher than the temperature set by the drip start temperature setting means, the heater is not energized, thus preventing dry firing during repeated use. Therefore, there is no need to waste power due to dry firing, and it is also possible to obtain extremely excellent effects in that failures due to abnormal heating of each component can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a coffee brewer showing an embodiment of the present invention, FIG. 2 is a front view of a conventional coffee brewer, and FIG.
The figure is a longitudinal sectional view of the same coffee boiler, FIG. 4 is a circuit diagram of the same coffee boiler, and FIG. 6 is a temperature characteristic curve diagram during dripping. 6...Body, 6...Heater, 9...
... Tank, 11 ... Water pipe, 14 ...
- Temperature sensing element, 15...Heater energization control means, 1
6...Drip start temperature setting means, 17...
... Comparison means, 18 ... Alarm device, 19 ...
...Microprocessor. Name of agent: Patent attorney Toshio Nakao and 1 other person @
1 Fig. u Fig. 2 Fig. 3 Mouth 5.

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 near the heater, a heater energization control means that controls the energization of the heater, a drip mechanism that supplies hot water to the coffee grounds and extracts the coffee liquid, and sets the temperature at the start of dripping. The output temperature of the temperature sensing element is compared with the output temperature of the drip start temperature setting means, and if the output temperature of the temperature sensing element is higher than the output temperature of the drip start temperature setting means,
and comparing means for outputting a prohibition signal for prohibiting heater energization to the heater energization control means. (2) An alarm is provided to notify that the drip operation will not be performed if the temperature detected by the temperature sensing element at the time of starting drip is higher than the temperature preset by the drip start temperature setting means. A coffee brewer according to claim 1.