JPS6038430Y2 - coffee extractor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a coffee extractor equipped with a heat insulating plate that heats a cup that stores coffee liquid.

Conventionally, in a coffee maker that also serves as a coffee extractor, coffee beans are ground in a case installed on the top of the container to obtain coffee powder, and hot water is supplied to the coffee powder to extract coffee liquid. is placed on a heat insulating plate of a cup mounting stand provided at the bottom of the container body, and is caused to flow out and be stored in the cup, and the heat insulating plate is heated by an electric heater to keep the coffee liquid in the cup warm. It is provided.

However, in the conventional configuration described above, the heat insulating plate is heated by the electric heater even when the cup is removed from the cup mounting table, so there is a problem that power is wasted, and the heat insulating plate is heated by the electric heater. It was dangerous because it was burning dry.

The present invention was developed in view of the above circumstances, and its purpose is to be able to notify you with an alarm when a cup is not placed on the heat insulating plate of the cup mounting stand, thereby preventing wasteful power consumption. To provide a coffee extractor capable of preventing a heat insulating board from being heated in the dry state.

Hereinafter, an embodiment in which the present invention is applied to a coffee maker which is a coffee extractor having a mill mechanism will be described with reference to the drawings.

First, the overall structure of the coffee maker will be described with reference to FIG.

Reference numeral 1 denotes a container body, which includes a mill mechanism 2 for crushing coffee beans, a drip mechanism 3 that is a hot water supply mechanism for dripping hot water into the crushed coffee powder to generate coffee liquid, and a cup for storing the generated coffee liquid. 4, and these will be explained in detail below.

That is, a motor storage part 5 and a cup mounting table 6 are formed on both left and right sides of the lower half of the container 1, and a case mounting part 7 and a water storage tank 8 are formed on both left and right sides of the upper half. are doing.

Reference numeral 9 denotes a heating plate provided in close contact with the lower surface of the heat insulating plate 6a attached to the cup mounting table 6, and an electric heater such as a sheathed heater 1
0 and a heating pipe 11 are buried in parallel, and one end of this heating pipe 11 is extended upward and connected to a water outlet (not shown) of the water storage tank 8 to serve as a water supply pipe 12, and the other end is used as a case mounting part. A hot water supply pipe 13 extends above the pipe 7.

Reference numeral 14 denotes a case attached to the case attachment part 7, which is common to both the mill mechanism 2 and the drip mechanism 3 described above. The drive shaft 16 is rotatably and watertightly inserted therethrough.

A cutter 17 for crushing coffee beans is attached to the upper end of the drive shaft 16, and a joint 18 is attached to the lower end, and this joint 18 is connected to the joint 20 of the motor 19 arranged in the motor housing 5. It's forcing me.

Reference numeral 21 denotes a filtration filter mounted in the case 14 by a frame-shaped filter support 22 and a watertight member 23 positioned below the cutter 17, so as to receive the coffee powder crushed by the cutter 17. .

Reference numeral 24 denotes an extraction port formed in the bottom wall 14a of the case 14, which corresponds to the cup mounting table 6 from above.

Reference numeral 25 denotes a lid removably attached to the upper opening of the case 14, which has an annular wall 25a protruding from its approximate center and a pouring hole located inside the wall 25a. 25b is formed.

Reference numeral 26 denotes a lid body, which is removably attached to the case mounting portion 7, which is the top opening of the container body 1, and the top opening of the water storage tank 8.

27 is a bimetallic switch which is a temperature regulator attached to the lower surface of the heating plate 9, and this detects the temperature regulator of the heating plate 9, that is, the heat insulating plate 6a, and causes the temperature to rise to the upper limit set temperature Tb. Then, it is turned off and turned on when the temperature drops to the lower limit set temperature Ta (see FIGS. 3 and 4).

The bimetallic switch 27 is interposed in the energization path of the sheathed heater 10, which is energized when a hot water supply (drip) operation switch (not shown) is turned on.

Now, the detection device 28 disposed inside the vessel body 1 according to FIG.
We will describe the configuration of

29 is a signal generation circuit, to which an on/off signal of the bimetal switch 27 is applied to an input terminal I;
When an off signal is applied, a start command signal is generated from the output terminal Oa, and when an on signal is applied, a stop command signal is generated from the output terminal Ob.

30 is a counter, which has input terminals Ia and Ib.
A start command signal and a stop command signal are respectively given from the output terminals Oa and ob of the signal generation circuit 29, and when the start command signal is given, a counting operation is started and a stop command signal is given. stops the counting operation and displays the numerical content at that time (
A counter output signal indicating the time) is generated from the output terminal O.

Reference numeral 31 denotes a comparator circuit, which receives the counter output signal of the output terminal O of the counter 30 at the input terminal ■ and compares the numerical content (time) of the counter output signal with the preset setting time t-1 ( For example, when the numerical content of the counter output signal is greater than the set time ta, a reset signal is generated from the output terminal Oa, and when the numerical content of the counter output signal is smaller than the set time ta, the reset signal is generated from the output terminal o.
A detection signal is generated from b.

The output terminal Oa of this comparator circuit 31 is applied to the reset terminal R, and the counter 3
0 is reset so that the numerical content becomes zero when a reset signal is applied.

Further, the detection signal at the output terminal ob of the comparator circuit 31 is applied to the input terminal of a drive circuit 32, and when the drive circuit 32 receives the detection signal, it operates and generates an alarm signal from the output terminal. and give it to the alarm buzzer 33,
The buzzer 33 is activated to sound.

Incidentally, the counter 30 is configured such that a reset signal is applied to the reset terminal R even when the operation switch is turned on at the start of hot water supply (drip).

Next, FIGS. 3 and 4 will explain the operation of this embodiment with the above configuration.
This will be explained with reference to the figures.

When producing coffee liquid, the water storage tank 8 is filled with water for the desired number of people, and the case 14 is filled with the corresponding amount of coffee beans, and the mill operation switch (
When the motor 19 of the mill mechanism 2 is turned on by turning on the motor 19 (not shown) to rotate the motor 19, the cutter 17 rotated thereby crushes the coffee beans.

After this crushing, when the cup 4 is placed on the heat insulating plate 6a of the cup mounting table 6, the upper opening of the cup 4 corresponds to the extraction port 24 of the case 14.

Then, when you turn on the hot water supply operation switch (not shown),
The sheathed heater 10 is energized via the bimetal switch 27 and starts to generate heat, and based on this, the heat insulating plate 6
The cup 4 is preheated by a, and the water in the heating pipe 11 supplied from the water storage tank 8 through the water supply pipe 12 is heated, and the boiling water is heated.

The hot water heated in this way rises up the hot water supply pipe 13 due to its boiling pressure, is supplied to the inside of the wall 25a of the lid 25 from the hot water supply port 13a at its tip, and drips into the case 14 from the pouring hole 25b. Therefore, hot water is supplied (drip).

Further, the hot water supplied into the case 14 passes through the coffee powder and the filter 21 and is extracted as coffee liquid, and the coffee liquid flows down from the extraction port 24 of the case 14 and is stored in the cup 4.

In this case, active heat exchange takes place between the heating plate 9 heated by the sheathed heater 10 and the water in the heating pipe 11, so that the temperature of the heating plate 9 (i.e., the heat insulating plate 6a) is the upper limit of the bimetal switch 27. The temperature does not rise to the set temperature hole, so the bimetallic switch 27 remains on.

When all the water in the water storage tank 8 is consumed, extraction of the coffee liquid is completed, but if you keep the hot water supply operation switch (not shown) in the ON state even after that, the bottom wall will come into close contact with the heat insulating plate 6a. The coffee liquid in the cup 4 is heated and kept warm.

In this heat-retaining state, the heat of the sheathed heater 10 is transferred to the cup 4 via the heating plate 9 and the heat-retaining plate 6a without exchanging heat with the water in the heating pipe 11, unlike in the case of dripping. As a result, the temperature of the heating plate 9 rises rapidly.

Then, when the temperature of the heating plate 9 reaches the upper limit set temperature Tb, the bimetal switch 27 that detects this is turned off and the power to the sheathed heater 10 is cut off.

Also, since the off signal of the bimetal switch 27 is given to the input terminal (2) of the signal generation circuit 29, the signal generation circuit 29 generates a start command signal from the output terminal ○a and outputs it to the input terminal Ia of the counter 30. The counter 30 starts counting.

After that, when the temperature of the heating plate 9 decreases due to the power outage of the sheathed heater 10 and reaches the lower limit set temperature Ta, the bimetal switch 27 is turned on and the sheathed heater 10 is energized again, and the temperature of the heating plate 9 is raised again. Rise.

Further, since the ON signal of the bimetal switch 27 is given to the input terminal I of the signal generation circuit 29, the signal generation circuit 2
9 generates a stop command signal from the output terminal Ob and applies it to the input terminal Ib of the counter 30, and the counter 30 stops counting and generates the numerical content as a counter output signal from the output terminal O. It will be applied to the input terminal (2) of the comparator circuit 31.

Therefore, the content of the count value of the counter 30 indicates the time from OFF to ON of the bimetal switch 27.

By the way, as mentioned above, the heat insulating plate 6a of the cup mounting table 6
When the cup 4 storing coffee liquid is placed on the holder, as shown in FIG. It is larger than the set time color of 31 (for example, 1 powder).

This is because even if the bimetal switch 27 is turned off and the power is cut off to the sheathed heater 10, the cup 4 storing relatively high temperature coffee liquid is placed on the heat insulating plate 6a, so that the heat insulating plate 6a and therefore the heating board This is based on the fact that the temperature of No. 9 falls relatively slowly.

Then, the comparison circuit 31 to which the time tb, which is the numerical content of the counter output signal of the counter 30, is given, generates a reset signal from the output terminal Oa because the time tb is larger than the set time ta (tb>ta). Then, the counter 30 is reset to zero.

Therefore, after that, the same operation as described above is repeated,
The coffee liquid in the cup 4 is kept warm between the lower limit set temperature Ta and the upper limit set temperature n.

On the other hand, when the cup 4 is removed from the heat insulating plate 6a of the cup mounting table 6, as shown in FIG.
The time tc until then is shorter than the set time ta (for example, 7 minutes).

This is because the absence of the cup 4 on the heat insulating plate 6a actively radiates heat from the heat insulating plate 6a to the atmosphere, and the temperature of the heat insulating plate 6a and therefore the heating plate 9 drops to 11 degrees.

Then, the comparison circuit 31 to which the time k, which is the numerical content of the counter output signal of the counter 30, is given, generates a detection signal from the output terminal -Ob because the time tc is smaller than the set time ta (tc(ta)). The signal is then applied to the drive circuit 32, and the drive circuit 32 is actuated to provide a signal to the buzzer 33, causing it to ring.

Accordingly, the user knows from the sound of the buzzer 33 that the cup 4 is not placed on the cup mounting table 6, and turns off the hot water supply operation switch (not shown) to cut off the energization path of the sheathed heater 10.

In addition, in order to stop the buzzer 33 from ringing, press the stop switch (
If a reset signal is given to the reset terminal R of the counter 30 at the same time when the drive circuit 32 is reset by operating the switch (not shown), the above-mentioned operation will be repeated unless the hot water supply operation switch is turned off. Therefore, when coffee liquid remains in the cup 4 which has been removed once, if the cup 4 is placed on the heat insulating plate 6a of the cup mounting table 6, heating and keeping warm will be performed again.

By the way, the time from on to off of the bimetal switch 27 (after time tit t4 after the end of drip) is as follows.
When the cup 4 is placed on the heat insulating plate 6a of the cup mounting table 6, heat exchange occurs between the heat insulating plate 6a (heating plate 9) and the coffee liquid in the cup 4, as shown in FIG. As shown, the temperature rise of the heating plate 9 is relatively slow and therefore relatively large, but if the cup 4 is not placed on the heat insulating plate 6a of the cup mounting table 6, the heat exchange as described above will occur. As a result, as shown in FIG. 4, the temperature rise of the heating plate 9 is rapid and therefore relatively small. The purpose of the person can be a distant relative.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings; for example, the detection device 28 may be configured with a microcomputer, and it may be applied not only to coffee makers but also to all coffee extractors. Of course, modifications may be made as appropriate without departing from the scope of the invention.

As explained above, the present invention detects the time from off to on or from on to off of the temperature controller that detects the temperature of the heat insulating plate on which the cup is placed, and activates the alarm when this is less than the set time. Since the alarm is activated, the user can know that no cup is placed on the heat-insulating plate, and can therefore take actions such as turning off the electric heater that heats the heat-insulating plate. It is possible to prevent unnecessary power consumption, and it is safe because it can prevent the heat insulating board from being heated dry. It also has practical effects such as being able to prevent the electric heater from becoming unnecessarily overheated and extending its life.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a longitudinal sectional view of a coffee maker, Fig. 2 is a block diagram of the detection device, and Figs. 3 and 4 are temperature characteristic diagrams for explaining the operation. be. In the drawing, 1 is the vessel body, 2 is the mill mechanism, and 3 is the drip mechanism (
4 is a cup, 6 is a cup mounting table, 6a is a heat insulation plate, 10 is a sheathed heater (electric heater), 14 is a case, 17 is a cutter, 27 is a bimetal switch (temperature controller), 28 is a detection device , 33 indicates a buzzer (alarm).

Claims (1)

[Scope of utility model registration request] A cup mounting table having a heat insulating plate provided on the container body and heated by an electric heater, and a cup mounting table provided on the container body to cause coffee liquid extracted from coffee powder to flow into a cup placed on the heat insulating plate of the cup mounting table. a case, a temperature controller that detects the temperature of the heat insulating plate and turns it on and off, and controls the electric heater to be turned on and off, and detects the time from OFF to ON or from ON to OFF of the temperature controller, and detects the time from OFF to ON or from ON to OFF, and determines the time from the set time. A coffee liquid extractor comprising a detection device that activates an alarm when the coffee liquid is small.