JPS58136317A - Rice cooker - 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] [Technical Field of the Invention] The present invention is characterized in that at the beginning of the rice cooking operation, the pot for heating the pot is temporarily cut off, and the output of the pot is kept in a state for a predetermined period of time. The present invention relates to a rice cooker equipped with a timer that can arbitrarily set the start time of the rice cooking operation.・ [Technical Background of the Invention] In order to cook rice properly, it is necessary for the rice to absorb enough water, and for this reason, it is necessary to use a hot pot for heating the rice at the beginning of the rice cooking process. A soaking operation is performed in which the power is cut off, the large state is maintained for a predetermined period of time, the water temperature in the pot is raised, and the water is left in the large state for a predetermined period of time. Nine cooked rice is served so that it can be absorbed by the water. On the other hand, in such a rice cooker,
There is a system in which a timer (for example, 12 hours) is provided so that the rice cooking operation is started at a desired time, and the rice cooking operation is started only when the timer operation time of this timer has elapsed.

[Problems with background technology]

Generally, if rice is soaked in water at room temperature, the amount of water absorbed by the rice will be saturated in about 2 hours.

However, in the rice cooker with the conventional configuration, the soaking operation is always performed after the rice cooking operation starts, regardless of the length of the timer operation time (i.e., the time the rice is soaked in water before the rice cooking operation starts). If the timer operation time is long, unnecessary soaking operations will be performed, which will unnecessarily lengthen the cooking time. It also has the disadvantage that the number of times it is used is unnecessary and the life of the contact enclosure due to power outage is shortened.

[Object of the Invention] Therefore, the object of the present invention is to perform a crushing operation in which the heater for heating the pot is temporarily cut off at the beginning of the rice cooking operation, and the output of the heater is then maintained at a high level for a predetermined period of time. This can be carried out automatically only when it is necessary, which has the effect of increasing the time required for cooking rice and increasing the number of contacts in the contact circuit. is a rice-cooking method that can further reduce the time required for cooking rice, and also eliminate the need for the troublesome task of changing the amount of water depending on the length of the timer's operation time.
It is on offer.

[Summary of the invention]

Zero 1a@'B is equipped with a timer that can set the start time of the rice cooking operation, and at the beginning of the rice cooking operation, the pot heating O and layer are temporarily cut off, and the output of the heater is reduced to maintain a good state for a predetermined period of time. The rice cooker is characterized in that the soaking operation is not executed when the timer operation time of the timer exceeds a certain period of time, and the above-mentioned configuration is further provided. In addition to this, the timer operation time becomes extremely long -! The output is switched to high, and it has the runner-up feature 1.

[Invention dormitory example]

Below, @1 of the present invention! ji! An example will be described with reference to FIGS. 1 to 3.

In Fig. 1, 1 is the main body of the rice cooker consisting of an inner case 2 and an outer case 3, etc., 4 is a lid, 5 is a next set stored in the inner case 2, and 6 is a space between the inner case 2 and the bottom of the pot 5. It is placed in the space and is a companion. It is a cup-shaped heat-sensitive part that is placed in elastic pressure contact with the outer bottom of the 7tims, and inside it is a thermistor 8 that is good for temperature sensing and has a heat conductive motor μ.
The temperature of the pan 50 can be sensed by means of the thermistor 8.

Reference numeral 10 denotes a case disposed at the outer bottom of the rice cooker main body 1, and inside the case there is a control circuit 119 whose circuit configuration is shown in FIG.
A display control circuit 12 and a timer 13 are housed. 14 is a 9-digit μ type time display section disposed on the outer surface of the outer case 5, which has, for example, four 7-segment light emitting diodes 15& to 15d in a horizontal row, and the tie Y13. Displays the remaining 9 tie times.

Next, in Figure 2, reference numeral 16 is an AC power supply, and the above-mentioned power supply is connected between both terminals of the power supply via a relay switch 17 which is normally connected. 18 is a drive circuit that turns on the relay switch 17 only when the signal "1" is input; 19;
is the start switch for starting rice cooking. When this start switch 19 is turned on, a signal "1" is sent to the fin L1.
" is output. In the front, 20 is an auxiliary drive circuit, and this means that the signal "1" is input! ! Only when the start switch 19 is turned on. Reference numeral 21 denotes a power source, which consists of a shaping circuit 22 that shapes the waveform of the output of the social current source 16, and a frequency dividing circuit 23 that divides the output of this shaping circuit 22. The circulation circuit 23 rotates the clock bar/L/pass Pc at a cycle of, for example, 1 second. The clock path μ is output to the fin Ls' at a cycle of, for example, 1 minute. Reference numeral 24 denotes a MuD converter which receives the resistance value of the thermistor 8 as an input, and converts the input value into a digital A/digital value every time a clock pulse Pa is received from the fin L at its terminal φ. -25 is a temperature converter that constitutes the temperature measuring section 26 together with the thermistor 8 and the Mu-D converter 24, and this converts the output of the A-D converter 24 into the digital μ every time the clock pulse Pc is received at its terminal φ.
The digital μ temperature value is outputted to the fin L4 as a temperature value signal 8d corresponding to the temperature of the pot 5 sensed by the thermistor 8.

Now, in the following, the control circuit 119 display system-circuit 12
and the timer 16 will be explained in terms of hardware using logic circuits and functional blocks.
Of course, the same functions as the timer 2 and the timer 13 may be provided.

First, the main points of each functional block 4a of the control circuit 11 will be explained. 27 is a calculation unit which receives the temperature value signal 8d at the input terminal I. This corresponds to the above temperature value signal 8dK, and the temperature gradient of the nine pots 5 is from the flat state 1M (the state 11i where the water in the pot 5 is boiling). When the rise starts at 9, the output of the output terminal P@ is reversed from the previous signal "0" to the signal "1", and the temperature gradient of the pot 5 changes to the temperature value when the rise starts at 9. Believe tsdK! Next, the 9 temperature value D1 for cooking and the temperature value Dz (Dl)Dt for double cooking are output from the output terminals P1 and P2 respectively, and furthermore, before this, the temperature of the pot 5 corresponding to the temperature value signal ad K is output. For example, when the temperature exceeds 40° C., the output of the output terminal Pi is inverted from a signal “0” to a signal “1”. 28 is the clock input terminal ON
This is a counter that counts the pulses input to the clear terminal C! LKmt11'' is cleared to input 1h and 11. 29 to 55 are comparators, which output a signal "1" when the input value of the terminal B is greater than or equal to the input value of the terminal B, and output a signal "0" in other cases.
Output. 34 is a double-cooking storage unit, which stores a double-cooking time value 'T14 (for example, 900 in this embodiment).
(seconds)) is memorized. 3" 5 and 36 are immersion memory sections, respectively. One memory section 55 stores the immersion time value T.
i5 (for example, 60 (minutes) in this embodiment) is stored, and the other storage msb stores a numerical value "0". ! I
Reference numeral 7 denotes a timer time determination storage section 69 which is configured together with the comparison section 53 and the determination section 38t, and this storage section 69 stores the determination time value Ti.
7 (for example, 5 (hour)) is stored. 59 is a down counter that counts pulses input to the clock input terminal CK, and this is preset to the input value for the terminal T when the signal "1" is input to the terminal W. i
In addition, 40i JR-8 flip-flops 41 to 45 are A
ND" circuit, 46 to 48 are OR circuits, 49 to 51
is a NOT circuit.

Next, an overview of each functional block 0 of the display control circuit 126 will be explained. 52 to 55 are the light emitting diodes 1, respectively.
These are drivers for driving 5& to 15dt, and when they receive a numerical signal at a terminal N, they cause the corresponding light emitting diode to display a circled number in accordance with the numerical signal. 9 and 56 are NOT circuits, and 57 to 60 are transfer gates, and these transformer 7 agates 57 to 60 exhibit a low impedance t- only when a signal "1" is input to their gate terminals, allowing the signal to pass. Permit.

On the other hand, an outline of each functional block of the timer 15 is as follows. 61 is a count section, which consists of a hexadecimal counter corresponding to the "hour" element and a 960-decimal counter corresponding to the "minute"element; 9.13-decimal counter is connected to the clock input terminal CK1 The input pulses are counted as stitches, and the sexagesimal counter counts the pulses input to the clock input terminal CKx.

62 Counting section 610 The count is transferred and this is a down counting section which is preset to a hexadecimal down counter and a sexagenary down counter, respectively.The outputs of this are P1 and P, respectively, which are hexadecimal down counters. The output terminals P1 and P4 correspond to the upper and lower digits of the number of stitches.
The iJ corresponds to the upper and lower digits of the sexagesimal down counter. The above sexagesimal down counter counts the clock pulse P'c (1 minute period) inputted to the clock input terminal ON, and the carry signal of the 1s hexadecimal down counter t'i is tt. Count. Ota, down count W, 62Fi
, when the counts of the 13-decimal down counter and the 60-cycle down counter both reach zero, a numerical value (!!frOJ) is output from the output terminal Pa, and the other values are other than "0" from the output terminal P. Furthermore, the down-counting section 62 has an output terminal Ps tube that outputs an enemy Ill signal corresponding to the elapsed time of the timer operation of timer 15, and the above output is output every hour after the start of the number of stitches. Terminal Pi
The counting signals from Nj, r2J, r3J,...
and gradually.

Reference numeral 65 is a comparison section, which outputs a signal "1" only when the inputs to terminals B and B are equal. 64 is a timer storage section in which the /Ii enemy value "0" is stored. 65 and 66 are switches for setting timer time, and when these are turned on, a signal "1" is output to the twins Lm and L4 corresponding to *. t, 67 and 68 are AND circuits.

Next, the specific signal flow in the I2 diagram will be described with reference to its effect and the temporal change characteristic diagram of the temperature of the pot 5 shown in the wS diagram. If rice cooking is to start after two hours, for example, a predetermined amount of rice and water are stored in the rope 5 and in good condition, and the timer time of the timer 15 is set using the switches 65 and 66. That is, when the switch 65 is turned on, the AND circuit 67 allows the passage of the clock pulse Pe, and the counting of the hexadecimal counter in the counter 161 progresses. Then, the Department of Internal Medicine went down to I62 and was sent to the town council) 1141).
Output terminals P1 and P! From this, the counting internal function of the above-mentioned hexadecimal counter is output. In this foreshadowing □, an electric value signal other than "0" is output from the output terminal PO of the down count section 420 and is given to the terminal of the mll times signal comparison section 63, so the comparison section 63 outputs a signal "0" because the input to the terminal B and the input to the terminal B (the numerical value "0" stored in the timer storage section 64) do not match, and this signal "0" is NO? @Road 56 Road 6
After the signal is inverted to "1", it is applied to the gate terminals of transfer gates 5 to 60, thereby allowing the signal to pass through. Therefore, the output terminal P1. of the down count section 62. 57. The output from Pg (corresponding to the count value of the hexadecimal counter in the counting section 61)
58t-passes through and is applied to the terminals N of the dopant controllers 52 and 53, and 1klirIJ corresponding to the time to the light-emitting diode electrodes 15 and 15b.

"2" will be displayed one after another, so the display will change to "
If the on-operation of the switch 650 is released when the count reaches 2'', the hexadecimal down counter in the down-counter 62 is preset to 12'', and the timer 15's 1-hour time period is set to 2 hours.

Incidentally, when setting the timer time of the timer 15 in minutes, it is sufficient to turn on the switch 66f. When the timer time of the timer 15 is thus set, the down-counter 62 starts counting the clock pulses P'o with a period of one minute, and the output terminals P1 to P4 are counted.
As the count from the timer 130 gradually decreases, the time displayed on the time display section 14 (the remaining time of the timer 130) gradually decreases every minute. After this, time t in FIG.
In other words, when the timer operation of timer 15 ends at o, When the 13-decimal down counter and the hexadecimal down-counter count in the count section 62 become zero and the internal display of the time display section 14 reaches 0:00, a numerical value is output from the down-count section 620 output terminal Po. When the signal "0" is output, the inputs to the terminals B of the comparator 63 match, and the comparator 63 outputs the signal "1".

Also, like this, timer 15! When the operation B1 has been carried out for 2 hours, the down-counter 62 outputs a numerical signal "2" from its output terminal P5. Time judgment storage unit 37 - Comparison unit 35 which receives the judgment time value Tiy (3 (hours)) at terminal B outputs a signal "0".
Exhibits II. However, when the signal "1" is output from the comparator 63 as described above at time to, the signal "1" is output.
”, the auxiliary drive circuit 20 turns on the star F switch 19, so that the signal “1” is output to the fin L1. This signal “1” causes the counter 2 to turn on.
8 is cleared, and the down counter 59 inputs the immersion time value Tio(-60(
At the same time, the signal ``1'' is received at the set input terminal B via the OIL circuit 46, and the qR-8 flipflop 40 is set, and the signal ``1'' from its output terminal Q is preset. It is applied to one input terminal of AND circuit 44. At this point, the AND circuit 44
Since the signal "0" from the output terminal Ph of the calculation lI 27 is inverted to the signal "1" by the NOT circuit 50 and then applied to the other input terminal of the OIL garden path 4B, as a result, A signal "1" is output from the ND@ path 44 and applied to the drive circuit 18. At this point, when the relay switch 17 is turned on by the drive circuit 18, electricity is supplied to the rice cooker from the AC power source 16, and the pot 5 is heated by the heater 6 and the rice cooking operation is started. Ru. When the temperature of the pot 5 increases to 40° C.KB by heating the pot 5 in this way (time tQ in FIG. 5, the calculation unit 27
Rounding, NO, where the signal "1" is output from the output terminal P black
The signal "0" is now output from the T circuit 50, and A
The output of the ND garden path 44 is inverted to the signal "0", and the drive circuit 18 turns off the relay switch 17t, thereby cutting off the power to the converter 6. In this way, the rice cooking operation is interrupted and the inside of the pot 5 is
A soaking operation is performed in which the water temperature is raised and the rice is left in a good condition, and the rice in the pot 5 actively absorbs water during this soaking period. 9, calculated at time t1 [27
When the signal f "1" is output from the 0 output terminal Pi and 9,
The signal "1" is given to the AND circuit 450@2 input terminal, and at this point, the O signal "0" from the comparison 1g52 is applied to the l1g1 input terminal of the ND circuit 45 NOT times 11) 5
1f'LiP Snow No. 11'', the ND circuit 45 allows the passage of the clock pulse P'c (1 minute period) applied to its @3 input terminal. The down counter 59 loses its preset value.
Counting starts from 60. After this, when the count value of the down counter 59 becomes ``0'' at time t2-, the count value ``0'' is received at the terminal BfC, and the value ``0'' from the immersion storage section 56 is received at the terminal BfC. Since the comparator 32 outputs a signal "1" and is inverted to a good state, this signal "
1” is received via the 0RIB circuit 48 and the ND circuit 44
starts outputting the signal "1" again, thereby restarting the electricity supply to the heater 6 and shifting from the soaking operation to the rice cooking operation. In addition, the temperature of the pot 5 is 40℃ during the soaking operation.
If the value is below, the signal "0" is output from the output terminal Pi of the operation 1s27, so the counting operation of the down counter 39 is stopped midway and the dipping operation is temporarily interrupted. When the temperature of the pot 5 exceeds 40° C. due to the accompanying rice cooking operation, the soaking operation is restarted.

While the soaking operation and rice cooking operation are being performed as described above, the temperature of the pot 5 rises as shown in FIG. It is output at the period of the clock pulse Pa). When the water in the pot 5 is boiled and in good condition, the temperature gradient of the pot 5 will reach 5 from a flat state, but at time ts in Fig. 13.
When the temperature of the pot 5 reaches D8°C and the temperature gradient starts to rise rapidly from a flat state, the calculation unit 27
A signal "1" is output from the output terminal Pa, and the output terminal P
1. According to the above temperature D8 from Px, the upper temperature is higher than D8.
The temperature values D2 for first and second cooking are output respectively. Then, since the good signal "1" outputted from the output terminal Pa is given to each input terminal of the muND circuits 41, 42, and 43, the AND circuit 43 allows the clock pulse Pooj given to the other input terminal to pass. The counter 28 starts to count the number of stitches when the dice are diced. On the other hand, output terminal P1
The one-temperature value D1 outputted from the first temperature value D1 is compared with the temperature value signal -j)8d by the comparator 50, and at time t4, the temperature value/signal -1,d becomes the highest-cooked multi-temperature value D1. When the value exceeds A, the comparator 30 outputs a signal "1" and A
It is applied to one input terminal of the ND circuit 42. In addition, since the other input terminal of the ND circuit 42 is given the signal "1" from the output terminal Pa of the calculation section 27, the A
ND circuit 42 outputs a signal "1" which is applied via OR circuit 47 to the reset input terminal of R-8 flip-flop 40. Therefore, R-8 flip-flop 40 is reset 1! Since the supply of the signal "1" to the drive circuit 18 is stopped, the relay switch 17 is turned off and -! 6 is cut off, and thereafter the operation shifts to double cooking operation (uniform operation). When the double-cooking operation is started in this way, the double-cooking ffi degree value D2 outputted from the output terminal Pg of the calculating section 27 is compared with the temperature value signal 8d in the comparison section 29, and the temperature value signal 8d is compared with the temperature value signal 8d. As the temperature of the pot 5 decreases due to the power outage, at time ts, the a degree value signal 8d becomes the double-cooking temperature value 0! When it becomes equal to f
ifrlj is output and applied to the input terminal 2 of the three-input type ND circuit 41. At this time, the above MND@Route 4
1 of 1. When the signal "1" is given to the fifth human power terminal from the output terminal To of the calculation section 27 and the comparison section 31, respectively, the mu ND circuit 41 outputs the signal "1", and this signal "1" is applied to the set input terminal 8 of the R-8 differential flop 4o via the OR circuit 46. Therefore, R-8
In the ninth stage, when the defroster 40 is set and the drive circuit 18 again receives the signal "1", the relay switch 17 is turned on and the heater 6 is energized again.
This is called double-cooking, where the rice is reheated. ? After -, the temperature value signal t8d exceeds the 9 temperature value D1 in accordance with the temperature rise of the pot 5 due to the above-mentioned double cooking. Then, when the temperature signal 8d becomes equal to the double-cooking temperature value in response to a decrease in the temperature of the silk 5 due to the power cutoff, the operation of energizing the silk 5 is repeated in the same manner as described above. And time t
At time t6, when 900 seconds (i.e. 15 minutes) have elapsed from □ corresponding to the double-cooking time value TI4, the count value of the boiling force sensor 28 is stored in the double-cooking storage section 54. Cooking time 1: Ninth equal to Tl14, comparison 1ifts! i1 now outputs a signal "0".

Then, the signal "0" is inverted to signal "1" by the N0TII8] path 49, and then R via the OR circuit 47t.
The signal is applied to the reset input terminal R of the -8 flip-flop 40, and the R-8 flip-flop 40 is reset, thereby ending the double-cooking operation and completing the cooking of the rice in the pot 5.

On the other hand, when the timer operation time of the timer 13 is set to a fixed time of 3 hours or more, the timer operation of the timer 15 ends at time to in the figure 1g3, and when the timer operation is completed, the output terminal PI of the down count section 62 is output. Since the numerical signal is "5" or more, the comparison section 5S in the determination section 38 outputs the signal "1".
is output. That is, the determination unit 38 outputs a signal "1" as a determination signal when the timer operation time of the timer 13 exceeds a fixed time of 5 hours 69, and this signal "1"
is input to the AND circuit 44 via the OR circuit 48.

Therefore, at the subsequent time t1, the signal "1" is output from the output terminal DO of the arithmetic unit 270, and the output of the NoT circuit 50 is inverted to the signal "0". On the other hand, in the ninth case where the signal "1" is continuously applied, the rice cooking operation is continuously performed without the soaking operation being performed. That is,! If the timer operation time of Imma 13 is longer than 5 hours, in other words, if the rice in the pot 5 has absorbed enough water and the rice cooking operation is started in good condition, it will take at least 60 minutes. Since the rice cooker no longer moves to the east, the time required for cooking rice can be shortened, and the unnecessary opening and closing of the V-switch 17 can be reduced, thereby extending its lifespan.

Figure 1g4 is the 21i! of the present invention! This is an example;
Below is the first part about this! j! Only the parts different from the example will be explained. That is, 69 is a part for heating the pot 5 which is set to a higher output than the heater 6, and the heater 69 is connected to the AC power supply 1.
60 terminals via a normally open relay switch 70Vt. 71 is Shin Ji! j When "1" is input, only the relay switch 70t is turned on.JI
A circle 72 is a comparison section forming a part of the determination section 58, and this comparison section 72 has the same configuration as the comparison section 51. 73
is a storage unit for timer time judgment which forms part of the judgment unit 58, and this storage unit has a judgment time value T7J (for example, 6 (hours)).
is memorized. 1&, 74' and 75 are AND circuits forming -m of the control circuit 11, and 76 is also the control circuit 1.
1.

WI mentioned above! According to the configuration of the I2 embodiment, the timer 15
If the timer operation continues for more than 5 hours, II5
The rice cooking operation by the heater 6 is continuously performed after time t1 in the figure, and the soaking operation is not performed, which is the same as in the first embodiment. If the timer operation of the timer 15 continues for a longer period of time, for example, 6 hours or more, the timer operation ends and the down-run occurs at the 9th point in time.
Since the numerical signal from the output terminal Ps is "6" or more, the input value to the terminal B of the comparing section 72 in the determining section 38 is such that the input value for the terminal B is input ti<judgment time value Tys).
As described above, the comparator 72 outputs the signal V"1" which is the auxiliary determination signal.
” will be output. Then, this signal “1” becomes N
The signal is inverted to “0” by OT@l path 76 and 9mKAN
The supply of the signal "1" to the ninth drive circuit 18 to the D' circuit 74 is stopped, and the relay switch 17 is turned off. At the same time, the signal "1" from the comparison section 72 is output.
is applied to one input terminal of the AND circuit 75, and the signal "1" is applied to the other input terminal of the AND circuit 75 from the R-8 flip-flop 40 at the end of the timer operation of the timer 13. As a result, the signal "1" is supplied to the drive circuit 71, and the relay switch 70 is turned on.
Now the rice cooking operation is done. In other words, if the length of time the rice is left soaked in water is extremely long, it is preferable to reduce the amount of water in the pot 5 in order to maintain the consistency of the rice. In addition, in this case, there is no problem even if the temperature of the pot 5 is quickly raised to the aphrodisiac temperature of rice O starch, so by heating the pot 5 at high output, the water evaporates. Increase the amount*”
This eliminates the need for the operation of "reducing the amount of water in the pot 5" and further shortens the time required for cooking rice. Therefore, according to this embodiment, the timer 13
It is also possible to obtain the effect that the troublesome operation of adjusting the amount of water in the pot 5 depending on the length of the timer operation time is unnecessary.

Note that during the dipping operation, it is not necessary to cut off the power to the heater, and it is of course possible to adopt a damping configuration in which the output is reduced by energizing the heater at once through a diode, for example.

〔Effect of the invention〕

According to the present invention, as is clear from the above explanation, a dipping operation is performed in which the power is cut off for heating the pot at the beginning of the rice cooking operation, and the output of the heater is maintained at a predetermined temperature with the output reduced. This can be executed automatically only when necessary, which has the effect of prolonging the time required for cooking rice without increasing the amount of time it takes to cook rice. This tortoise also has the effect of eliminating the need for the troublesome operation of changing the amount of water depending on the length of IL and the length of timer operation time.

Fig. 1 is a partially cut-away @ side view of the rice cooker, Fig. 2 is a block diagram showing the electrical configuration, and Fig. 3 is a diagram showing how the temperature of the pot changes. Maku, happy 4 figures are 12 of the present invention
FIG. 2 is a diagram corresponding to FIG. II2 showing an embodiment.

In the figure, 5 is a pot, 6.49Fi and -! , 8 is the thermistor (
11 is a control circuit, 15 is a timer, and 38 is a determination section.

Claims (1)

[Claims] l. A temperature sensor is provided to control the rice cooking operation based on the detected pot temperature, and the heater for heating the pot is temporarily cut off or the output of the heater is turned off at the beginning of the rice cooking operation. The rice cooking apparatus includes a control circuit that performs a rice cooking operation of holding the rice in a dropped state for a predetermined period of time, and a timer that starts the rice cooking operation when the timer operation time that can be installed is passed and the rice cooking operation is suitable. , further comprising a determination unit that outputs a determination signal when the timer operation time of the timer exceeds a certain time, and when the determination signal is output, the rice cooking operation is continuously performed without performing the soaking operation. A rice cooker characterized in that it is configured to control. A temperature sensor is provided to control the rice cooking operation based on the temperature of the round steel detected by the temperature sensor, and a predetermined state is set in which the heater for heating the pot is temporarily cut off at the beginning of the rice cooking operation, or the output of the heater is then reduced. The control circuit is equipped with a control circuit that executes the soaking operation to maintain the time, and a timer that starts the rice cooking operation when the timer operation time that can be set arbitrarily has elapsed. It has a corner determination section which outputs a determination signal when the operating time exceeds a certain period of time, and outputs an auxiliary determination signal when the timer operation time exceeds a further fixed period of time. At the time of output, the rice cooking operation is continuously controlled without performing the soaking operation t-dori, and when the auxiliary determination signal is output, the heater is switched to a high output to control the rice cooking operation in a good state. The characteristics of the cooking and cooking *ai.