JPS6243459Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a so-called double-cooking electric rice cooker that reheats the pot for a certain period of time after rice cooking is completed. A timer motor that performs reheating for a predetermined period of time and a timer switch that is linked to the timer motor are provided, and the first and second timer contacts of this timer switch are skillfully used to reheat the timer motor after the predetermined time has elapsed. This is to stop the operation of the rice cooker and return it to the initial state, and also to prevent the rash indicator lamp from lighting up at the beginning of rice cooking.

Generally, the pot is reheated for a certain period of time after the rice is cooked, and the pot is reheated for a certain period of time (approximately 15 to 20 minutes) after the rice is cooked.
It is said that delicious rice can be obtained by performing murashi. For this purpose, a timer motor has been used that measures a predetermined time after rice cooking is completed, reenergizes the heater for a predetermined period within this predetermined time, and then stops after the above-mentioned predetermined time period has elapsed. However, after the timer motor stops operating, it is different from the initial state at the start of rice cooking, so the timer motor performs a timing operation after the completion of rice cooking at the same time as the next time rice cooking starts, resulting in a drawback that the desired rice is not cooked. In order to improve this drawback, some machines are equipped with a two-contact type timer switch that stops the operation of the timer motor after a predetermined time has elapsed after rice cooking is completed, but this switch only operates and stops the timer motor. However, a separate switch must be provided to prevent the erroneous display lamp that indicates the erroneous rice cooking operation for a predetermined period of time from being turned on during a certain period of time at the beginning of rice cooking, which increases the number of parts and increases the electrical circuit. This method had the drawback of becoming more complex and reducing reliability due to the increased number of mechanical switches (contact points). Furthermore, due to the increase in the number of switches, timer devices incorporating timer motors, timer switches, etc. have become larger, requiring a larger storage space.

The present invention was devised in view of the above drawbacks, and will be explained below based on the _drawings.H1 is a heater that heats a pot (not shown), MS is a movable contact MS-a and a first
The rice cooking switch has a contact MS-b and a second contact MS-c. During rice cooking, the heater _H1 is energized through the first contact MS-b, and when the rice cooking is completed, the high temperature is sensed and the movable contact is switched on. MS-a is the first contact MS
Switch and connect from -b to second contact MS-c.
The first contact MS-b is connected to one end of the heater _H1 . B is the movable contact MS-a and the first contact MS-
A heat retention circuit consisting of a thermal reed switch TRS and a heat retention heater _H2 connected between the terminals B and _H3 is a resistor whose one end is connected to the second contact MS-c of the rice cooking switch MS. It is used as an auxiliary heater for heating, and its resistance value is set larger than that of the heater _H1 .
TM is a timer motor which has a resistance value greater than the resistance value of the resistor _H3 and operates for a certain period of time at the beginning of rice cooking and a certain period of time after the completion of rice cooking. A reheating switch DS reenergizes the heater _H1 without going through the switch MS, and a reheating switch DS that turns on after a predetermined time has elapsed after rice cooking is completed in conjunction with the timer motor.
It has a timer switch TS that connects the timer motor and heater _H1 in parallel. The first timer contact TS-f is connected to the movable contact TS-e when the TM operation is stopped, and the timer motor TM is connected to the movable contact TS-e when the TM operation is stopped.
The second timer contact TS-g is connected to the movable contact TS-e when a nonuniformity indicator lamp (described later) is turned on to indicate the operation of the second timer contact TS-g.
The first timer contact TS-f is connected to the connection between the first contact MS-b of the rice cooking switch MS and one end of the heater _H1 , and to one side of the reheating switch DS, and the movable contact TS-e is connected to the resistor H1. The timer motor TM is connected to the other end of the resistor _{H 3 and} the movable contact TS-e of the timer switch TS, and to the other end of the heater H ₁ . _V1 ,
V ₂ is the AC power supply terminal, PS is one AC power supply terminal V ₁
SS is a manual reheating selection switch connected between one power terminal _V1 and the other side of the reheating switch DS, _L1 is the heater A cooking indicator lamp is connected in parallel to _H1 , _L2 is a cooking indicator lamp connected between the second timer contact TS-g and the other AC power supply terminal _V2 , and _L3 is a warming indicator connected in parallel to the resistor _H3. It's a lamp.

Next, regarding the operation, if you want to reheat the rice after cooking is complete, press the reheat selection switch SS.
When you turn on the rice cooker and operate the rice cooking start button (not shown), the movable contact MS-a of the rice cooking switch MS switches to the first
The contact MS-b is switched and connected, and the heater _H1 is energized to start cooking rice, heating the pot, and the rice cooking indicator lamp _L1 lights up. As this rice cooking starts, the timer motor TM is activated to measure a certain period of time (approximately 1 minute) via the first timer contact TS-f and the movable contact TS-e, and the movable contact TS-e is connected to the second timer contact.
The timer motor TM is switched and connected to TS-g to stop its operation, and the timer motor and the rice display lamp _L2 are connected in parallel to prepare for operation after rice cooking is completed. At this time, the unevenness indicator lamp _L2 does not light up. Eventually, when the temperature of the pot suddenly rises to a high temperature and the rice cooking is complete, the rice cooking switch MS detects this high temperature and switches the movable contact MS-
A is switched and connected from the first contact MS-b to the second contact MS-c, the timer motor TM is driven via the resistor _H3 , and the unevenness display lamp _L2 is lit to indicate the unevenness state. On the other hand, after several minutes have passed when the temperature of the pot has dropped due to the completion of cooking, turn on the reheat switch DS and turn on the reheat switch DS.
Then, the heater _H1 is energized again for a certain period of time via the reheat selection switch SS to reheat the pot.
Then, the pot becomes hot again and so-called double cooking is performed, which is completed by turning off the reheating switch DS. Eventually, the movable contact MS-a of the rice cooker switch MS
When a predetermined period of time (approximately 15 to 20 minutes) has elapsed from the point at which rice cooking is completed when the first contact MS-b switches to the second contact MS-c, the movable contact TS-e of the timer switch TS switches to the second timer contact TS. -g is switched and connected to the first timer contact TS-f to return to the initial state, and a heater _H1 with a small resistance value is connected in parallel to the timer motor TM, and this parallel circuit is connected in series to the resistor _H3 . As a result, the potential across the parallel circuit decreases and the timer motor TM
stops working. And resistor _H3 and heater
A series circuit of _H1 is formed, and the resistor _H3 , which has a higher resistance value than the heater _H1 , generates heat and enters a heat retention state, and the heat retention indicator lamp _L3 lights up. Eventually, when the temperature of the pot drops to around 70 degrees, the thermal reed switch is activated.
TRS turns on and generates heat together with resistor _H3 , keeping the pot at the optimal temperature.

In addition, in the present invention, the timer motor measures the predetermined time after rice cooking is completed through a resistor.
The resistor may be replaced with a heat-retaining heater in the heat-retaining circuit.

As described above, the present invention includes a rice cooking switch that energizes the heater through the first contact during rice cooking and switches from the first contact to the second contact upon sensing the high temperature after the rice cooking is completed, and for a certain period of time at the beginning of rice cooking. and a timer motor that operates to measure a predetermined time after the completion of rice cooking, and the operation for the above-mentioned fixed time is carried out through the first timer contact, and the operation for the predetermined time is carried out via the second contact, and after the predetermined time has elapsed, the timer motor is interlocked. a timer switch that switches from the second timer contact to the first timer contact to stop the operation of the timer motor and return to the initial state; and a first timer contact that is connected to the second timer contact and lights up during timing operation for a predetermined time. The heater is equipped with a heating indicator lamp that turns off when the rice is switched off, and a reheating switch that is linked to the timer motor and reenergizes the heater for a certain period of time within the aforementioned predetermined period. Since the timer motor is automatically stopped after a predetermined period of time and the timer motor is returned to the initial state of rice cooking, it is possible to prevent the timer from operating incorrectly the next time the rice is cooked. Only one operation of the timer switch (connection of the first timer contact) is required. Furthermore, since the rash indicator lamp is connected to the second timer contact of the timer switch, the rash indicator lamp is prevented from lighting up during the timer motor's timekeeping operation for a certain period of time in the initial stage of rice cooking. In particular, as mentioned above, the first and second timer contacts of the timer switch are skillfully used to stop the operation of the timer motor after a predetermined period of time has elapsed, allowing the rice to return to its initial state, and at the same time, the rice-cooking indicator lamp lights up at the beginning of rice cooking. This makes it possible to significantly simplify the electric circuit, reduce the number of switches (contact points) that are prone to failure, and improve reliability.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram of the electric rice cooker of the present invention, and FIG. 2 is an explanatory diagram of the operation of each part. H ₁ ...Heater, MS...Rice cooking switch, MS
-a...Movable contact, MS-b...First contact, MS-
c...Second contact, TM...Timer motor, DS
...Reheating switch, TS...Timer switch, TS-a...Movable contact, TS-b...First timer contact, TS-c...Second timer contact, _L2 ...
...Murashi indicator lamp.

Claims (1)

[Scope of utility model registration request] A heater that heats the pot, a rice cooking switch that applies electricity to the heater through a first contact during rice cooking and switches from the first contact to the second contact upon sensing the high temperature when the rice cooking is completed, and a rice cooking switch that switches from the first contact to the second contact. There is a timer motor that operates to measure the time and a predetermined time after rice cooking is completed;
a timer switch that is operated via a contact and switches from a second timer contact to a first timer contact in conjunction with the timer motor after a predetermined time has elapsed, stopping the operation of the timer motor and returning to the initial state; a timer indicator lamp that is connected to the contact and lights up while the predetermined time is being counted, and turns off when the first timer contact is switched, and the heater is re-energized for a certain period of time within the aforementioned predetermined time in conjunction with the timer motor. An electric rice cooker characterized by being equipped with a reheating switch.