JP3461423B2 - rice cooker - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rice cooker in which a jar portion is removable from a base portion and is electrically connected to each other by placing the jar portion on the base portion at a fixed position.

[0002]

2. Description of the Related Art In a rice cooker, a jar portion with a pot is detachably attached to a base portion with a burner, and only the jar portion is moved separately, so that cooked rice can be easily placed on a table or the like. It is known as a separate type that can be carried to.
In such a rice cooker, an operation unit equipped with operation switches such as a rice cooker switch and a display unit for displaying an operating state during rice cooking and heat retention are provided in a base unit together with a controller for controlling burner combustion operation. Therefore, the operation is difficult and the display is difficult to see. Therefore, the jar unit is provided with the operation unit and the display unit, the communication controller is provided, and the jar unit is fixedly mounted on the base unit to be electrically connected to each other, thereby enabling communication with the controller of the base unit. The applicant has previously proposed such a configuration. In this rice cooker, for example, if the jar part is removed during rice cooking control, communication is not possible and it is dangerous. Therefore, it is necessary to extinguish the burner and stop the rice cooking control.
In this way, by detecting the disconnection of the communication line due to the removal of the jar part and immediately stopping the control,
The safety can be increased.

[0003]

However, because of the simple structure in which the jar part is placed on the base part in a fixed position to be electrically connected, an object may be hit by an instrument or the jar part may be lifted by mistake. The communication may be temporarily interrupted due to being lost. Therefore, for example, when the communication is temporarily interrupted during rice cooking control, the rice cooking control is stopped and the rice must be re-cooked from the beginning. It is an object of the rice cooker of the present invention to solve the above problems and safely continue control even when communication is temporarily interrupted.

[0004]

A rice cooker according to claim 1 of the present invention, which solves the above-mentioned problems, comprises a burner and a base part having a combustion control part for controlling the combustion operation of the burner; A rice cooker comprising a jar portion detachably mounted on the top and provided with a pot heated by the burner, the operation portion being provided in the jar portion and controlling the combustion control portion by an input operation; A communication control unit that sends a signal based on an input from the operation unit to the combustion control unit, and electrically connects the combustion control unit and the communication control unit in a fixed position mounting state of the jar unit on the base unit. When the communication between the connection control means and the combustion control unit and the communication control unit is disabled, the rice cooking operation or the heat retention operation is stopped, and communication is performed within a predetermined allowable period after the communication is disabled. Cooking only when The operation or heat retaining operation is summarized as further comprising an automatic returning means for automatically returning.

The rice cooker according to claim 2 of the present invention for solving the above-mentioned problems is the rice cooker according to claim 1, wherein the predetermined allowable period is a value according to the sequence content when communication is disabled. The point is to do.

In the rice cooker according to the first aspect of the present invention having the above structure, the combustion control section and the communication control section are electrically connected to each other in a state where the jar section is fixedly mounted on the base section. Here, when communication is interrupted by an object hitting the appliance during the rice cooking operation or the heat retention operation or by accidentally lifting the jar part, the rice cooking operation or the heat retention operation is stopped. Since the rice cooking operation or the heat retaining operation is automatically restored only when the communication is restarted within the allowable period, the rice cooking operation or the heat retaining operation is continued if there is a temporary interruption.

In the rice cooker according to claim 2 of the present invention having the above-mentioned configuration, the predetermined allowable period is set to a value corresponding to the sequence contents when communication is disabled, and the usage conditions and the sequence contents are set. An appropriate allowable period can be set according to the degree of risk.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the rice cooker of the present invention will be described below in order to further clarify the constitution and operation of the present invention described above. FIG. 1 is an explanatory view of a rice cooker as an embodiment of the present invention. This rice cooker includes a base portion 10 and a jar portion 30 which is detachably mounted on the base portion 10.

The base portion 10 is a burner 1 for burning gas.
1 and a gas supply path 1 for supplying gas to the burner 11.
2 and three solenoid valves 13, 14, 1 for opening and closing the gas flow path
5 and the frame rod 16 for detecting the flame of the burner 11
An igniter 17 for igniting the burner 11, a pot bottom thermistor 18 for detecting the temperature of the pot bottom, a pot switch 19 for detecting the presence or absence of the pot, and a main body controller 20 for controlling combustion. The main body controller 20 is provided with a plug 21 for obtaining a commercial power source and a storage battery 22 as a secondary battery. On the other hand, the jar unit 30 is provided on the lid 32 and a pot 31, a lid 32, an operation unit 33 having switches such as rice cooking, heat retention, and a timer, a display unit 34 for displaying current time, rice cooking, heat retention, and the like. A lid thermistor 35 for detecting the temperature inside the kettle, a heater 36 for keeping heat, and a sub controller 37 as a communication control unit are provided. Further, connection terminals 23 and 38 are provided on the upper surface of the base portion 10 and the lower surface of the jar portion 30, respectively, and both connection terminals are electrically connected to each other when the jar portion 30 is mounted on the base portion 10 at a fixed position. It is connected and can supply power and deliver electrical signals.

The main body controller 20 detects the presence / absence of a commercial power source, converts it to a circuit power source when the commercial power source is supplied, and charges the storage battery 22. On the other hand, when there is a power failure or the plug 21 is not inserted, the storage battery 22
To obtain the circuit power supply. In other words, the storage battery 22
If the charge amount of is above a predetermined value, a reservation standby operation, a rice cooking operation, and a heat retention operation can be performed.

The sub controller 37 operates using the electric power sent from the main body controller 20 as a power source. And
When the sub controller 37 is turned on by the power supply from the main body controller 20, bidirectional communication between both controllers is started. Here, this communication control will be described.
Incidentally, since the reservation standby operation, the rice cooking operation, and the heat retention operation are common controls, in the following description of the communication control, these operations are collectively referred to as “operation” for convenience. Further, in the present embodiment, the main body controller 20 and the sub controller 3
The time required for communication with 7 is 0.4 seconds one way. The sub controller 37 is reset immediately after the power is turned on, and starts transmitting the stop instruction to the main body controller 20. The main body controller 20 is reset immediately after the power is turned on, and starts transmitting a signal indicating that the sub controller 37 is stopped. Further, the operation is performed according to the operation instruction from the sub controller 37, and the operation is stopped according to the stop instruction. Then, it transmits a signal indicating that it is operating or stopped to the sub controller 37. The main body controller 20 transmits an operation prohibition signal to the sub controller 37 in the following cases. a. Hook switch 19
When is OFF. b. When power is not supplied from the commercial power source and the charge amount of the storage battery 22 is less than the predetermined value. After the start of transmission of the stop instruction, the sub controller 37 switches the transmission signal from the stop instruction to the operation instruction in the following cases only when the operation prohibition signal is not received from the main body controller 20. a. When the operation start is input by the operation unit 33. b. When a signal indicating that the sub controller 37 is operating is received from the main body controller 20 within 1.5 seconds after the sub controller 37 is reset. After starting the transmission of the operation instruction, the sub controller 37 switches the transmission signal from the operation instruction to the stop instruction in the following cases. a. When the operation stop is input by the operation unit 33. b. Within 10 seconds after the sub controller 37 switches the transmission signal from the stop instruction to the operation instruction, the main controller 2
When the signal from 0 indicating that it is operating is not received. c. When an operation prohibition signal is received from the main body controller 20. The main body controller 20 suspends the operation when the communication with the sub-controller 37 is interrupted after starting the transmission of the signal indicating that the main controller 20 is operating, but the transmission of the signal indicating that the main controller 20 is operating is predetermined from the disconnection. It is forced to continue until the allowable time of. When the main body controller 20 receives an operation instruction from the sub controller 37 before the predetermined allowable time elapses from the disconnection, the main body controller 20 continues the operation from the state immediately before the communication is interrupted. When the main body controller 20 does not receive the operation instruction from the sub controller 37 until a predetermined allowable time elapses from the disconnection, the main body controller 20 completely stops the operation and transmits a signal indicating that the operation is stopped.

Here, the above-mentioned communication control will be described. When the main body controller 20 transmits the operation prohibition signal as described in (4), the operation is prohibited or stopped as described in (c). The burner 11 burns when the shuttle 31 is not set. Heater 36
This is for the purpose of preventing the danger of turning on, and for the reason that normal operation cannot be expected unless power is supplied from the commercial power source when the charge amount of the storage battery 22 is less than a predetermined value. Further, as described in b, when the signal indicating that the operation is in progress is received from the main body controller 20 within 1.5 seconds after the reset of the sub controller 37, the transmission signal is switched from the stop instruction to the operation instruction. When communication is restored immediately after disconnection of communication, the operation instruction is given by receiving a signal indicating that the operation is in progress as described in
This is to continue the operation as described in. still,
The reason why the resetting of the sub-controller 37 is within 1.5 seconds is to reliably receive the communication signal from the main body controller 20, and the value is not necessarily limited to this value. Further, as described in b, when the sub controller 37 does not receive the signal from the main body controller 20 that it is in operation within 10 seconds after switching the transmission signal from the stop instruction to the operation instruction, The transmission signal is switched from the operation instruction to the stop instruction in order to determine the abnormality of the main body controller 20. In addition, from transmission signal switching 10
The reason for setting the time within the second is for surely confirming the operation of the main body controller 20, and is not necessarily limited to this value. In addition, in, the judgment as to whether or not to continue the operation is made based on whether or not the operation instruction is received within the permissible time, but the judgment is made based on whether or not the restoration of the communication line is detected within the permissible time. May be. In addition, in the present embodiment, the predetermined permissible time for facilitating the description and the predetermined permissible time for are not particularly distinguished, but in practice, the permissible time for ) Is a value slightly longer than the allowable time in (that is, the time during which the transmission is forcibly continued). When the communication line is restored within the allowable time after the disconnection of the communication line, the reset sub controller 37 receives a signal indicating that the main controller 20 is forcibly continuing the operation. This signal is received within 1.5 seconds of reset,
The sub controller 37 switches the transmission signal from the stop instruction to the operation instruction. If the allowable times are the same, the operation instruction from the sub controller 37 is sent to the main body controller 20.
The permissible time may expire before the reception. In this case also, the operation starts, but the operation is performed from the beginning rather than continuing immediately before the communication is interrupted. The allowable time for that purpose is set to be slightly longer in consideration of the time required for the signals to make a round trip. Particularly, the rice cooking control is effective because it is possible to prevent a trouble that the rice cooking operation is performed from the beginning even while the rice is being cooked.

Next, the automatic return control process executed by the main body controller 20 will be described. FIG. 2 is a flowchart showing this processing, which is started by inserting the plug 21 into the commercial power supply. When this routine is activated (S1), first, the microcomputer in the main body controller 20 is initialized (S2), and then a state of waiting for an input from the operation unit 33 is entered. When the rice cooking time is reserved by the operation unit 33, the sub controller 37 gives a reservation instruction to the main body controller 20. When the main body controller 20 receives this reservation instruction (S3: Y
ES) and a reservation waiting routine is entered (S4). In the reservation waiting routine, the rice is waited until the rice cooking start time (for example, 45 minutes before the reservation time) that makes the rice cooked at the reserved time, and when the rice cooking start time comes (S5: YES), the rice cooking operation is performed. Move to control routine. Waiting for a reservation
Upon receiving the reservation instruction from the sub controller 37, the main body controller 20 transmits a signal indicating that the reservation is waiting. Here, when the jar portion 30 is separated from the base portion 10,
Power is not supplied to the sub controller 37, and the sub controller 37 is in a state in which the operation is stopped. In this way, when the main body controller 20 detects the disconnection of the communication line (S6: YES), the timer is started to count the allowable time (S7), and during this period, the transmission of the signal indicating that the reservation is on standby is forcibly continued. . Then, when it is detected that the communication line has returned within the allowable time of 1 minute (S9: NO), that is, the jar section 30 has been returned to the base section 10 (S8: YES), the sub controller 37
As soon as the reservation instruction is given from the sub controller 37 by the signal indicating that the reservation is waiting (S10: YE
S) and continue the reservation standby operation. On the other hand, when the communication line is not restored (S8: NO) and the reservation instruction is not given even after the allowable time of 1 minute has passed (S9: YE).
S) Then, the transmission indicating that the reservation is waiting is stopped, the reservation waiting routine is terminated, and the operation unit 33 waits for an input.

On the other hand, when a stop operation is performed by the operation unit 33 in the normal reservation standby operation, the sub controller 37 gives a stop instruction to the main body controller 20. The main body controller 20 receives the stop instruction (S1
1: YES), the reservation waiting routine is ended, and the operation unit 33
The system is waiting for input from.

Next, the rice cooking control will be described. When a rice cooking operation is performed by the operation unit 33 while waiting for an input from the operation unit 33, the sub controller 37 gives a rice cooking instruction to the main body controller 20. When the main body controller 20 receives this rice cooking instruction (S12: YES), the rice cooking control routine is started (S13). In the rice cooking control routine, the solenoid valves 13, 14, 15 are opened to open the gas flow path to the burner 11 and the igniter 17 is operated to ignite, and flame detection is performed by the frame rod 16 to start the rice cooking operation. . Then, based on the temperature detected by the lid thermistor 35 and the pot bottom thermistor 18, each solenoid valve 13, 1
4 is opened and closed to perform combustion control such as adjusting the combustion amount of the burner 11 (S14). During the rice cooking operation, the main body controller 20 receives a rice cooking instruction from the sub controller 37 and transmits a signal indicating that the rice is being cooked. Where jar 3
When 0 is separated from the base unit 10 to detect a disconnection of the communication line (S15: YES), a timer for counting the allowable time is started (S16), and a signal indicating that rice is being cooked is transmitted during this period. Forcibly continue. Further, the burner 11 is extinguished and the rice cooking operation is temporarily stopped (S17). Then, when it is detected that the communication line is restored within the allowable time of 3 seconds (S19: NO) (S18: YES), the sub controller 37 sends a signal to the sub controller 37 that the rice is being cooked. As soon as the rice cooking instruction is given (S20: YES), the rice cooking operation is continued. On the other hand, the communication line does not recover (S18:
NO), if the rice cooking instruction is not given even after the allowable time of 3 seconds has passed (S19: YES), the transmission indicating that rice is being cooked is stopped, the rice cooking control routine is ended, and the operation unit 33 is operated. The system is waiting for input from. In the rice cooking control, the unevenness control, and the heat retention control, which will be described later, the allowable time for continuing the operation is set to 3 seconds, which is set to a value shorter than 1 minute which is the allowable time in the standby for reservation. This allowable time is more effective as it is set longer in order to prevent the operation stop due to the user's erroneous operation, but when the user removes the jar portion 30 for the purpose of stopping the operation, not by the erroneous use, or Regardless of this, if the user determines that the operation of the device has stopped when the jar portion 30 is removed, the longer the allowable time, the more dangerous. For example, the jar portion 30 is removed during the heat retention operation, the pot 31 is washed, and then the jar portion 30 is again attached to the base portion 1.
When placed on 0, the heat retention operation will continue within the allowable time. Although it is necessary to set the allowable time based on this point, the usage conditions and the risk level differ depending on the operation content, and it is determined that the risk level is relatively low in the reservation standby. The time is set longer. The allowable time is not limited to these values.

On the other hand, in the normal rice cooking operation, the operation unit 33
When the stop operation is performed by, the sub controller 37 gives a stop instruction to the main body controller 20. The main body controller 20 receives this stop instruction (S21: Y
ES), the rice cooking control routine is finished, and the state of waiting for an input from the operation unit 33 is entered. On the other hand, when the rice cooking operation is continued without receiving the stop instruction and the water in the pot 31 evaporates and the pot bottom temperature reaches the predetermined temperature (S22), the burning operation is ended (S23), and the purging routine is performed. (S24).

In the Murari routine, the cooked rice is cooked for a certain period of time. During the purging operation, the main body controller 20 receives a rice cooking instruction from the sub controller 37 and transmits a signal indicating that rice is being cooked. Where jar 3
When 0 is separated from the base unit 10 to detect disconnection of the communication line (S25: YES), a timer for counting the allowable time is started (S26), and a signal indicating that rice is being cooked is transmitted during this period. Forcibly continue. Then, during the allowable time of 3 seconds (S28: N
O) When it is detected that the communication line is restored (S27:
(YES), as soon as a rice cooking instruction is given from the sub controller 37 by the signal indicating that rice is being cooked, which is transmitted to the sub controller 37 (S29: YES), the purging operation is continued. On the other hand, when the communication line is not restored (S27: NO), and the rice cooking instruction is not given even after the allowable time of 3 seconds has passed (S28: YES), the transmission of the fact that it is in the middle of a day is stopped. Then, the murmuring routine is ended, and the operation unit 33 waits for an input.

On the other hand, in the normal purging operation, the operation unit 3
When the stop operation is performed by 3, the sub controller 37 gives a stop instruction to the main body controller 20. The main body controller 20 receives this stop instruction (S30:
(YES), the purging routine is ended, and the state of waiting for an input from the operation unit 33 is entered. On the other hand, when a certain time has elapsed after continuing the purging operation without receiving the stop instruction (S31: YE
S) Or, when the heat retention operation is performed while waiting for the input from the operation unit 33 (S32: YES), the process proceeds to the heat retention control routine (S33).

In the heat retention control routine, the heater 36 is turned on.
A heat-retaining operation is performed to keep the rice within a predetermined temperature range by the / OFF control (S34). During the heat retention operation, the main body controller 20 receives a heat retention instruction from the sub controller 37 and transmits a signal indicating that the heat retention is in progress. Here, when disconnection of the communication line is detected due to the jar unit 30 being separated from the base unit 10 (S35: YES), a timer for counting the allowable time is started (S3).
6) During this period, the signal indicating that the temperature is being kept warm is forcibly continued. Further, the power supply to the heater 36 is turned off to temporarily stop the heat retention operation (S37). Then, when it is detected that the communication line is restored within the allowable time of 3 seconds (S39: NO) (S38: YES), the sub controller 37 sends a signal indicating that the rice is being cooked to the sub controller 37. As soon as a heat retention instruction is given (S40:
YES), the heat retention operation is continued. On the other hand, when the communication line is not restored (S38: NO) and the heat retention instruction is not given even after the allowable time of 3 seconds has passed (S39: YE
S), the transmission indicating that the heat is being maintained is stopped, the heat retention control routine is ended, and the operation unit 33 waits for an input.

On the other hand, in the normal warming operation, the operating portion 33
When the stop operation is performed by, the sub controller 37 gives a stop instruction to the main body controller 20. The main body controller 20 receives the stop instruction (S41: Y
ES), the heat retention control routine is terminated, and the operation unit 33 waits for an input.

Next, the difference in the operation between the case where the automatic recovery control process of the present embodiment (that is, the control for continuing the operation when the communication is immediately recovered after the communication line is disconnected) is not executed and the case where it is executed, Compare using a time chart.
First, the case where the automatic return control process is not executed will be described with reference to the time chart of FIG. During the rice cooking operation, the sub controller 37 gives a rice cooking instruction to the main body controller 20, and the main body controller 20 controls the burning operation of the burner 11 and transmits a signal indicating that the rice is being cooked. Here, when the main body controller 20 detects the disconnection of the communication line by separating the jar portion 30 from the base portion 10, the rice cooking control is stopped for safety, and the burner 1
Extinguish 1 Therefore, the main body controller 20 transmits a signal indicating that it is stopped. After that, the stopped state is continued even if the communication line is restored. Next, the case where the automatic return control process is executed will be described with reference to the time charts of FIGS. Here, FIG. 6 and FIG. 7 are examples of the case where communication is restored and the case where communication is not restored, respectively. First, the case where communication is restored will be described. As shown in FIG.
When the main body controller 20 detects a disconnection of the communication line during the rice cooking operation, the burner 11 is extinguished for safety, but the rice cooking control is in a suspended state and can be continued, and a signal indicating that rice is being cooked is transmitted. Forced to continue during the allowable time. When the communication line is restored within the allowable time, the sub controller 37 is reset and transmits a stop instruction. However, by receiving a signal from the main body controller 20 indicating that the rice cooking operation is being performed, the main body controller 2
Switch the transmission to 0 to the rice cooking instruction. Main body controller 2
0 receives the rice cooking instruction and releases the rice cooking control from the paused state, and continues the rice cooking control from the state before the stop. Next, a case where communication is not restored will be described. As in the case of FIG. 6, when the main body controller 20 detects the disconnection of the communication line, the burner 11 is extinguished, the rice cooking control is suspended, and a signal indicating that rice is being cooked is forced to be transmitted for an allowable time. To continue. Here, if the communication line is not restored and the main body controller 20 does not receive the rice cooking instruction even after the allowable time elapses, the rice cooking control is completely stopped and a signal indicating that the rice cooking is stopped is transmitted. . After that, even if the communication line is restored, the sub controller 37 receives the signal indicating that the sub controller 37 is stopped, and thus the stopped state is continued.

As described above, according to the rice cooker of the present embodiment, an object may be hit by the appliance or the jar portion 30 may be accidentally lifted while cooking rice, keeping warm or waiting for reservation. Thus, by continuing the control even when the communication is temporarily interrupted, it is possible to prevent the problem that the rice-cooking operation is stopped during the rice-cooking and the rice has to be cooked from the beginning, which is convenient. Also,
If communication is interrupted, the burner 11 is extinguished or the heater 36 is turned off, so that the safety is high. Further, by stopping the control when the communication is interrupted for a long time, it is possible to prevent an erroneous operation of continuing the operation against the user's will when the jar portion 30 is placed. In addition, by changing the timer time according to the operation, the optimum timer time can be set according to the use condition and the degree of danger, and the usability is further improved.

In the rice cooker of this embodiment, the automatic return control process is performed only when communication is interrupted, but when the rice is cooked, kept warm, or reserved, the operation unit 33 causes an erroneous stop operation. Also, when the operation unit 33 again performs an operation for performing the operation before the stop,
The operation may be continued. By performing such control, it is possible to prevent a malfunction due to an erroneous operation by the operation unit 33.

The embodiment of the present invention has been described above.
The present invention is not limited to these examples, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention. For example, the plug 21 for obtaining commercial power may be provided in the sub controller and the power of the main body controller 20 and the heater 36 may be supplied from the sub controller 37.
According to such a configuration, the jar portion 30 is connected to the base portion 10
Even when it is removed and moved, it can be kept warm if there is a commercial power supply.

[0025]

As described in detail above, the first aspect of the present invention
According to the rice cooker described, even if the communication is temporarily interrupted due to something hitting the appliance during the rice cooking operation or the heat retention operation, or the jar portion is lifted by mistake, the rice cooking operation or Is easy to use because it keeps warming. Further, since the rice cooking operation or the heat retention operation is stopped after the communication is interrupted, the safety is high. Further, since the automatic recovery is not performed when the predetermined permissible period is exceeded, the operation is continued against the user's intention when the jar part is placed even after the communication is interrupted for a long time. Malfunctions can be prevented.

Further, according to the rice cooker according to the second aspect of the present invention, by setting the allowable period according to the sequence content when communication is disabled, the operation is stopped due to an erroneous operation and the user's will is urged. On the contrary, it is possible to reduce the trouble that the operation is continued.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a rice cooker as an example.

FIG. 2 is a flowchart showing an automatic return control process.

FIG. 3 is a flowchart showing an automatic return control process.

FIG. 4 is a flowchart showing an automatic return control process.

FIG. 5 is a time chart when the automatic return control process is not executed.

FIG. 6 is a time chart when an automatic return control process is executed.

FIG. 7 is a time chart when an automatic return control process is executed.

[Explanation of symbols]

10 ... Base part, 11 ... Burner, 18 ... Kettle bottom thermistor, 20 ... Main body controller, 21 ... Insertion plug, 23 ... Connection terminal, 30 ... Jar part, 33 ... Operation part, 34 ... Display part, 35 ... Lid thermistor, 36 ... Heater, 37 ... Sub controller, 38 ... Connection terminal.

Claims (2)

(57) [Claims] 1. A jar section having a burner and a base section having a combustion control section for controlling the combustion operation of the burner, and a jar section detachably mounted on the base section and heated by the burner. In the rice cooker consisting of, an operation unit provided in the jar unit, which controls the combustion control unit by an input operation, and a communication control unit which sends a signal based on an input from the operation unit to the combustion control unit, Communication between the combustion control unit and the communication control unit is disabled, and a connection unit electrically connecting the combustion control unit and the communication control unit in a fixed position mounted state of the jar unit on the base unit. If the rice cooking operation or the heat retaining operation is stopped, the automatic returning means for automatically returning the rice cooking operation or the heat retaining operation only when the communication is restarted within a predetermined allowable period after the communication is disabled. With Rice cooker and butterflies. 2. The rice cooker according to claim 1, wherein the predetermined permissible period is a value according to the sequence content when communication is disabled.