JPH0510752Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application and overview of the invention] The present invention relates to a rice cooker, particularly a rice cooker with a timer that can start cooking rice at a desired time using a built-in timer. The temperature inside the rice cooker is displayed on the display section that displays the set time of the timer, as necessary, so that maintenance and inspection of the appliance can be easily performed.

[Prior art and its problems] As this type of rice cooker, there is one shown in FIG. 3, for example.

The one shown in the figure is a so-called three-dimensional rice cooker used for commercial purposes, and the operation section 1 on the front of the appliance has a rice cooking switch 2, a timer operation switch 3, and a timer operation switch 3. A display 31 is provided for displaying information.

In this device, when the desired time for rice cooking is set using the timer operation switch 3, this time is stored in a reserved time storage device (not shown) and the stored contents are displayed on the display 31, and then the start switch 4
3, a timer built into the appliance is activated and the rice cooking operation starts after the timer set time has elapsed.

BACKGROUND ART In commercial rice cookers that cook a large amount of rice, maintenance and inspection of the appliances may be performed in order to maintain the safety of the appliances.

However, the conventional rice cooker has a problem in that maintenance and inspection of the rice cooker becomes complicated.

This is because, in the case of the above-mentioned conventional rice cooker, a special inspection device is required to measure the internal temperature of the rice cooker when performing maintenance and inspection of the appliance.

That is, when performing maintenance and inspection of a rice cooker, the control operation of the appliance, which turns the gas burner to low heat or extinguishes it when the internal temperature of the rice cooker reaches a certain temperature, is mainly checked. In other words, the relationship between the internal temperature of the rice cooker and the calorific value of the gas burner was confirmed.

When carrying out the above-mentioned inspection work in the above-mentioned conventional system, not only do you have to wait for a change in state such as the flame of the gas burner to become smaller or extinguish it, but also, when the change in state occurs, The temperature inside the rice cooker must be checked by measuring the output of a heat-sensitive element attached to the outer bottom of the rice cooker using a tester or the like. In other words, in the case of the above-mentioned conventional rice cooker, a special inspection device such as a tester to measure the temperature inside the rice cooker and special measurement work using it are required during maintenance inspection, and the maintenance and inspection work of the rice cooker is accordingly reduced. It becomes complicated.

[Technical Problem] The present invention consists of a timer for rice cooking reservation to start the rice cooking operation after a set time has elapsed, a reservation time storage device for storing the time set in this timer, and a timer for storing the reservation time. In a rice cooker with a timer, the temperature inside the cooker is displayed on the timer display 31 as necessary to facilitate maintenance and inspection work. The technical challenge is to make it possible.

[Means] The technical means of the present invention for solving the above problems will be described with reference to the conceptual diagram shown in Figure 1.
The technical means of the present invention is as follows: ``In the electric circuit to the display 31, there is a changeover switch 4 which is selectively connected to the output circuit of the heat-sensitive element attached to the outer bottom of the rice cooker and the output circuit of the reservation time storage device. ' was inserted.'

[Effect] The above technical means works as follows.

Normally, the changeover switch 4 is set to the reservation time storage device side to bring the reservation time storage device and the display 31 into electrical continuity, and the appliance is used in this state.

When the reservation time is set in the same way as in the conventional system described above, the contents stored in the reservation time storage device are applied to the display 31 via the changeover switch 4 and displayed on the display 31.

Next, when performing maintenance and inspection of the appliance, the changeover switch 4 is switched to the heat-sensitive element side, and the combustion operation of the appliance is tested in this state.

Then, the output of the heat sensitive element indicating the temperature inside the pot is applied to the display 31 via the changeover switch 4 which has been switched to the heat sensitive element side, and the display 31 will display the temperature inside the pot.

The temperature display displayed on the display 31 and
Perform maintenance work by checking the function of the equipment while checking the status of the heating device, such as changes in the flame of the gas burner.

As described above, according to the technical means of the present invention, by switching the changeover switch 4, the temperature inside the pot can be displayed on the display 31 as necessary.

[effect] The present invention has the following unique effects.

Since the temperature inside the pot can be displayed on the timer display 31 as necessary, maintenance and inspection work can be performed without a special inspection device for inspecting the signal of the heat-sensitive element for detecting the temperature inside the pot. Work becomes easier.

Furthermore, since the detected temperature of the heat-sensitive element is displayed on the display 31 on which the stored contents of the reserved time storage device are displayed, there is no need to provide a special display device for displaying the detected temperature. The space of the operation section provided with various display devices does not become large. Furthermore, since the maintenance and inspection of the heating section and the inspection of the memory contents of the reservation time storage device are not performed at the same time, the display 31 is made to alternatively display the memory contents and the detected temperature of the heat-sensitive element. There will be no inconvenience caused by this.

[Example] Next, an example of the present invention described above will be described in detail with reference to the drawings.

As shown in FIG. 2, a heat-sensitive element 51 composed of a thermistor is attached to the outer bottom wall of the rice cooker 5, and the output of the heat-sensitive element 51 is connected to a voltage/pulse conversion circuit 61 and Tridecimal counters 62 to 64
The signal is applied to a counting type A/D converter 6 consisting of. In addition, the first to third decimal counters 62 to 64
The output of the fourth, third, and second
The voltage is applied to each of the BCD7 segment decoders 55, 54, and 53 separately, and each of the first to third 10
The advance counters 62 to 64 are connected by a carry circuit 26.

And each of the above BCD7 cement decoders 52~
55, 7 segment LEDs 57, 57 are connected separately, and these 7 segment LEDs 5
7, 57 and each of the above BCD7 cement decoders 52
. . . 55 constitute the display device 31.

Further, the first gate 67 has a first JK flip-flop (hereinafter abbreviated as the first JKFF) 4 whose output is inverted every time the changeover switch 4 is operated.
1 Q output is applied and the first JKFF
The output of 41 is sent to a second gate 3 interposed between the display 31 and a reservation time storage device 33, which will be described later.
The voltage is applied to the control input terminal of No. 4.

The reserved time storage device 33 includes a binary counter 3
5. Consists of a fourth decimal counter 36, a hexadecimal counter 37, and a fifth decimal counter 38. are connected by carry circuits 26, 26, respectively.

The fifth decimal counter 38 and the fourth decimal counter 36 constituting the reserved time storage device 33 are provided with first and second timer switches 30 and 32 for setting hours and minutes.
In this embodiment, the first and second timer switches 30 and 32 constitute a timer operation switch 3. The first timer switch 30 is operated to set the hour unit, and the second timer switch 32 is operated to set the minute unit.

The output of the second oscillator 39 via the first and second timer switches 30 and 32 is
1, and the output of the second timer switch 32 for setting the minutes is applied to the UP input terminal 23 of the UP/DOWN counter 22, which constitutes the timer 21 and is made of a sexagesimal counter. There is.
Further, the DOWN input terminal 24 of the UP/DOWN counter 22 has a second signal having a frequency of 1/60 (Hz).
The output of the oscillator 28 is applied via the second AND circuit 17. The other input terminal of the second AND circuit 17 is connected to a second JK flip-flop 44.
In addition, the output of the second JK is applied.
The output of the start switch 43 is applied to the flip-flop 44 via a second OR circuit 45.

On the other hand, the "hour" in timer operation switch 3
1st timer switch 3 for setting the unit of
The output of 0 is the UP/DOWN counter 22 mentioned above.
The first OR circuit 26 along with the output of the carry circuit 29
is applied to the UP input terminal 27 of the 24-base counter 25 via
The DOWN input terminal 14 has the above-mentioned UP/
The output of the borrow circuit 15 from the DOWN counter 22 is applied.

Finally, the above 24-decimal counter 25 and UP/
2nd AND circuit 1 that outputs an “H” signal when both DOWN counters 22 are about to output a “0” signal
6 is the same as the start switch 43 mentioned above.
It is connected to the 2OR circuit 45, and is further connected to the 2OR circuit 45.
The output of the 2AND circuit 16 is applied to an RS flip-flop (hereinafter abbreviated as RSFF) 47, and the
An excitation coil 73 for a solenoid valve 71 that opens and closes the gas circuit to the gas burner 7 according to the output of the RSFF 47.
is now being turned on and off.

In the initial state when the power is connected to the appliance, the
The output of 1JKFF41 is in "H" state,
The second gate 34 connecting the reserved time storage device 33 and the display 31 is in an open state due to the application of the "H" signal.

In this state, when the first timer switch 30 is turned on to set the reservation time, the number of pulses oscillated from the second oscillator 39 while the first timer switch 30 is kept pressed is counted by the fourth decimal counter 36. , binary counter 35 and 24-digit counter 25
counts, and when the operation of the first timer switch 30 is stopped, the set time in units of hours is stored in the fourth decimal counter 36 and binary counter 35. The storage time is divided into 7 segments via the first and second 7 segment decoders 52 and 53.
Displayed on LEDs 57, 57.

Next, when the second timer switch 32 is pressed to set the unit of "minutes" for the reservation time, the set "minutes" are changed to 6
The data from the decimal counter 37 and the fifth decimal counter 38 are displayed on the 7-segment LEDs 57 and 57 via the third and fourth 7-segment decoders 54 and 55.

Also, by operating the first timer switch 30 described above, the timer operation switch 3 is incorporated.
The 24-decimal counter 25 counts up and counts up the 24
The set time is stored in the advance counter 25,
When the other second timer switch 32 is operated,
In the same way as the above set time memorization operation, UP/
The unit of "minute" is stored in the DOWN counter 22.

Then, when the start switch 43 is turned on with the above time set, the second JK flip-flop 4
4 begins to output an "H" signal, and from this point on, the oscillation pulse of the second oscillator 28 begins to be applied to the UP/DOWN counter 22 via the second AND circuit 17, and every time there is this applied signal, the UP/DOWN counter 2
2. The 24-base counter 25 performs a counting operation, and these UP/DOWN counters 22 and 24-base counter 2
When both the stored values of 5 become "0", the second AND circuit 16 outputs a signal and the RSFF 47 outputs an "H" signal, and after that, the excitation coil 73 for the solenoid valve 71 is maintained in the energized state and the gas burner 7 is turned on. It starts to burn.
In other words, rice cooking begins.

Next, if the internal temperature of the rice cooking pot 5 is to be displayed on the display 31 in order to check the function of the appliance during the rice cooking process, the changeover switch 4 may be turned on again.

When switch 4 is turned on again, the first JKFF4
1 changes to "L" and the second gate 34 is closed, whereby the reserved time storage device 33
The circuit connecting the display device 31 and the display device 31 is cut off. or,
1st JKFF by re-turning on the above changeover switch 4.
The Q output of 41 changes to "H", and the A/D converter 6
The first gate 67 inserted into the circuit connecting the timer operation switch 3 and the timer operation switch 3 is opened. Then, A/D
The output of the heat-sensitive element 51 converted into a digital quantity by the converter 6 is sent to the 7-segment LED 5 of the display 31 via the first gate 67 in the open state.
It will be displayed as 7,57.

In addition, when displaying the set time for reserved rice cooking on the display 31, it is sufficient to turn on the changeover switch 4 again to invert the output of the first JKFF 41, and when the output of the first JKFF 41 is inverted again, the corresponding
The Q output of 1JKFF41 returns to "L" and the output returns to "H", the same state as in the initial operation of rice cooking, and thereby the display 31 displays the set time for reserved rice cooking.

In the above embodiment, when the rice cooking operation starts, the rice cooking operation progresses while the output of the heat sensitive element 51 attached to the outer bottom surface of the rice cooking pot 5 inside the appliance is managed by a computer or the like (not shown). Needless to say, people are starting to cook their own meals.

[Brief explanation of the drawing]

Fig. 1 is a conceptual explanatory diagram of the present invention, Fig. 2 is an explanatory diagram of an embodiment of the present invention, and Fig. 3 is an explanatory diagram of a conventional example. , 33
...Reservation time storage device.

Claims (1)

[Scope of utility model registration request] A rice cooking reservation timer for starting the rice cooking operation after a set time has elapsed, a reservation time storage device for storing the time set in this timer, and a display device for displaying the stored contents of the reservation time storage device. In a rice cooker with a timer comprising 31,
This rice cooker with a timer has a changeover switch 4 inserted in the electric circuit to the display 31 to selectively connect to the output circuit of a heat-sensitive element attached to the outer bottom of the rice cooker and the output circuit of a reserved time storage device.