JPH0587347A - Heating cooking appliance - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a heating cooker capable of ensuring safety by automatically turning off the power circuit even if the power switch of the power circuit constituting the magnetron drive circuit is closed by welding or the like. .. [Structure] Between the main body and the door 10, when the door 10 is closed, the door 10 is locked, and the door 10 is opened and closed to turn on and off the door switch 15a of the power circuit.
The latch mechanism 20 for FF is provided, and the door switch 15a is provided so as to be turned on / off by the rotation of the arm 23 of the latch mechanism 20 provided on the main body side. A coil 31 is provided. By operating the electromagnetic coil 31, the arm 23 is rotated, the door switch 15a is turned off, and the latch 12a provided on the door 10 side is rotated to release the lock. What you did.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker, and more specifically, a power circuit is turned on and off by opening and closing a door.
The present invention relates to a heating cooker such as a microwave oven provided with a high-frequency heating means, an microwave oven provided with the high-frequency heating means and a heating means such as a heater.

[0002]

2. Description of the Related Art A heating cooker provided with a microwave oven, a microwave oven, or a griller having a heating means such as a heater is widely used as a cooker for household use. FIG. 3 is a perspective view of an ordinary microwave oven with the door opened, and FIG. 4 is a circuit diagram of the magnetron drive circuit. In the figure, reference numeral 1 denotes a main body of a microwave oven, a heating cabinet 2, an operation unit 3 provided on one side of a front surface,
It is composed of a control unit, a magnetron (not shown), etc., housed on the rear surface of the operation unit 3. Power supply ports 4a and 4b for emitting microwaves from the magnetron are provided on the side wall of the heating chamber 2, and at the bottom. A turntable 5 is provided.
Reference numeral 10 denotes a door that is attached to the main body 1 so as to be openable and closable, and has a door handle 11 provided on the front surface, and a locking hole 7 provided on the front plate 6 of the main body 1 in conjunction with the door handle 11 on the back surface.
Latches 12a and 12b for locking the door 10 by fitting and locking the doors a and 7b are provided.

Reference numeral 13 is a magnetron drive circuit provided in the main body 1, 14 is a commercial power source, and 15a and 15b are main body 1
Is a door switch which is provided on the back surface of the locking holes 7a, 7b and is turned on and off as the door 10 is opened and closed by a latch mechanism described later. 16 is a door switch 15a, 15b
ON / OFF by, for example, a relay connected in series with
The power switch 14 is a power switch for
It is connected to the primary side of the high-voltage transformer 17 via 5a, 15b and the power switch 16 and constitutes a power circuit 13a. Reference numeral 18 is a high-frequency oscillator connected to the secondary side of the high-voltage transformer 17, and 19 is also a magnetron, which is driven by the high-frequency oscillator 18 and outputs a microwave. The magnetron drive circuit 13 is controlled by the control unit provided in the main body 1.

Next, the latch mechanism provided between the main body 1 and the door 10 will be described with reference to FIG. A latch 12a is rotatably supported above and below the door 10, and is fixed to a shaft 21 to which a handle 11 is fixed. An engaging protrusion 12b is provided at the tip of the latch 12a, and the other end of a spring 22 whose one end is fixed to the door 10 is connected to the inside of the door 10 so that an arrow a is formed around the shaft 21.
Directional turning force is applied.

Reference numeral 23 is an arm mounted on a shaft 24 fixed to the main body 1, and has an abutting portion 25 at one end.
A relatively weak spring 26 is provided between the other end and the front plate 6 of the main body 1.
Is provided to apply a rotational force in the direction of arrow b to the arm 23. Reference numeral 23a is an operating piece extending from the end of the arm 23. Reference numeral 27 denotes a locking portion provided on the inner surface of the front plate 6 in the vicinity of the locking hole 7a, which constitutes the latch mechanism 20. Reference numeral 15a is a door switch provided in the power supply circuit 13a that constitutes the magnetron drive circuit 13, for example,
A mover 28 biased downward by a spring 29 is built in, and the door switch 15a is turned on when the mover 28 moves up and turned off when it moves down. Reference numeral 8 denotes a stopper of the arm 23 provided on the main body 1.

In the above-described latch mechanism 20, when the door 10 is closed, the latch 12a is fitted into the locking hole 7a and the engaging projection 12b is locked into the locking portion 27 as shown in FIG. Locked. At this time, the engaging projection 12b of the latch 12a abuts the abutting portion 25 of the arm 23 to rotate the arm 23 in the direction opposite to the arrow b and abut the lower surface of the door switch 15a. As a result, the door switch 15a becomes O
N

Next, when the handle 11 is rotated in the direction of arrow d to open the door 10, the latch 12a interlocking with the handle 12 is rotated.
6 also rotates about the shaft 21 in the direction opposite to the arrow a, and the engagement projection 12b and the engagement portion 27 are disengaged and the lock is released, as shown in FIG. The door 10 can be opened by pulling it. At this time, arm 2
3 is biased by a spring 26 to rotate in the direction of arrow b around the shaft 24, and is separated from the door switch 15a. As a result, the actuator 28 of the door switch 15a is biased by the spring 29 and moves down, turning off the door switch 15a. The arm 23 is held in the state shown in FIG. 6 by the operating piece 23a hitting the stopper 8 and stopping.

In the microwave oven as described above, first, when the cooking container containing the food to be cooked is placed on the turntable 5 and the door 10 is closed, the latches 12a and 12b are locked in the locking holes 7a and 7b. The door 10 is fitted and locked, and the door switches 15a and 15b are turned on. Then,
When the cooking temperature, time, etc. of the food to be cooked are set by the operation unit 3, the power switch 16 is turned on by a command from the control unit,
The power source 14 is connected and the magnetron 19 is driven to emit microwaves from the power supply ports 4a and 4b into the heating chamber 2 to heat the food to be cooked.

When the set cooking time has elapsed, the power switch 16 is turned off by a command from the control unit, and the microwave emission is stopped. Door 10 for taking out the food
When the door is opened, the door switches 15a and 15b are also turned off.
Also, if you open the door 10 for some reason while cooking,
Since the door switches 15a and 15b are turned off and the microwave emission is stopped, there is no danger even if a hand or the like is put in the heating chamber 2.

[0010]

In the above-described heating cooker, the power switch 16 of the power circuit 13a constituting the magnetron drive circuit 13 is turned on by welding the relay or the like due to long-term use or other reasons. , Even if a command is sent from the control unit, it may not turn off. In such a case, when the door 10 is closed after cooking is completed, the latch mechanism 20 causes the door switches 15a and 15b to be closed.
Is turned on to keep the power supply circuit 13a turned on, and the magnetron 19 continues to emit microwaves. For this reason,
If left unattended for a long time, there was a risk of fire or electric shock.

The present invention has been made to solve the above problems, and heating is performed so that safety is ensured by automatically turning off the power supply circuit even if the power supply switch of the power supply circuit is closed by welding or the like. The purpose is to obtain a cooking device.

[0012]

A heating cooker according to the present invention comprises a switch provided in a drive circuit of a high-frequency heating means, a switch provided in a drive circuit of a high frequency heating means, and a switch provided on a back surface of a locking hole provided in a front plate of a main body. The arm of the latch mechanism that locks the door is provided, and the door is provided with the latch of the latch mechanism that is interlocked with the door handle and fitted into the locking hole of the main body, and the arm is brought close to the arm of the latch mechanism by the command from the control unit. It is provided with an electromagnetic coil for adsorbing.

[0013]

After the cooking is completed or when the cooking machine has not been used for a certain period of time, the relay is actuated by the command from the control unit to attract the arm of the latch mechanism. This causes the arm to rotate to unlock the latch, slightly open the door, and maintain this state. On the other hand, the rotation of the arm turns off the switch provided in the drive circuit of the high-frequency heating means.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an explanatory view of an embodiment of a latch mechanism which is an essential part of the present invention. The same parts as those in FIG. 5 showing the conventional side are designated by the same reference numerals, and the description thereof will be omitted. In the present embodiment, the iron piece 30 is attached to the operating piece 23a of the arm 23, and the electromagnetic coil 31 is provided so as to face the iron piece 30. In addition, 32 is a DC power supply for exciting the electromagnetic coil 31, and 33 is a switch inserted in the exciting circuit.

Next, the operation of the present invention configured as described above will be described. When the door 10 is closed, as described in the conventional example of FIG. 5, the door 10 is locked by the latch 12a being locked by the locking portion 27, and the arm 23 is brought into contact with the lower surface of the door switch 15a to lock the door switch 15a. Turn on. Door 10
The operation when opening and closing is also as described in FIG. At this time, the switch 33 of the electromagnetic coil 31 is turned off, and the electromagnetic coil 31 does not operate.

When the cooking is completed or if it is not used for a certain period of time, the switch 33 of the electromagnetic coil 31 is turned on according to a command from the control unit, and a current is passed through the electromagnetic coil 31 to operate it. As a result, the iron piece 30 provided on the actuating piece 23a of the arm 23 is attracted to the electromagnetic coil 31, the arm 32 rotates in the direction of the arrow b, separates from the door switch 15a, and turns off the door switch 15a. On the other hand, when the arm 23 rotates, its abutting portion presses the engaging projection 12b of the latch 12a in the arrow direction, disengages the engaging portion 27, and unlocks. As a result, the engaging protrusion 12b of the latch 12a
Is urged by the spring 22 and abuts on the locking portion 27, so that the door 10
Is held slightly open.

When a certain time (for example, one second) has passed since the electromagnetic coil 31 was activated, the switch 33 of the electromagnetic coil 31 is turned off by a command from the control section, and the iron piece 30 is removed.
Adsorption is released. However, since the arm 23 is given a rotational force in the direction of the arrow b by the weak spring 26, the arm 23 is held as it is, and the door switch 15a continues to be in the OFF state. When the door 10 is closed, the state of FIG. 1 is restored again, and the door switch 15a is turned on.
To do. The operation time of the electromagnetic coil 31 depends on the latch 12
It is necessary for the engaging protrusion 12b of a to be disengaged from the engaging portion 27, and if this time is long, the door 10 cannot be closed immediately after the operation of the electromagnetic coil 31.

The present invention is constructed as described above, and the arm 23 of the latch mechanism 20 is automatically rotated after the cooking is finished or when the door switch 15a, 15 is not used for a certain period of time.
Since b is turned off and the state is continued, the power supply circuit 13a of the magnetron drive circuit 13 is turned on and OF
Even if the F power switch 16 is closed by welding a relay or the like, the door switches 15a and 15b inserted in series with the power switch 16 are automatically turned off, so that the magnetron 19 is driven for a long time to cause a fire. It does not cause electric shock.

In the above description, the present invention is applied to a microwave oven, but the present invention can also be applied to a microwave oven or a heating cooker provided with a griller in the microwave oven.

[0020]

As described in detail above, the present invention is provided with an electromagnetic coil which is operated in response to a command from the control unit in the vicinity of the main body and the arm of the latch mechanism provided on the door, and is used after cooking or for a certain period of time. If not, operate the electromagnetic coil to rotate the arm of the latch mechanism and automatically turn off the door switch inserted in the power supply circuit of the magnetron drive circuit.
Since it is set to F, the magnetron will not be driven even if the power supply circuit of the magnetron drive circuit is closed due to welding of the power switch, etc. Therefore, there is no fear of fire or electric shock. Can be obtained.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a latch mechanism that is an essential part of the present invention.

FIG. 2 is a diagram for explaining the operation of FIG.

FIG. 3 is a perspective view of the microwave oven with a door opened.

FIG. 4 is a circuit diagram of a magnetron drive circuit.

FIG. 5 is a configuration diagram of a conventional latch mechanism.

FIG. 6 is an explanatory view of the operation of FIG.

[Explanation of reference numerals] 1 main body 2 heating cabinet 3 operation part 7a locking hole 7b locking hole 10 door 11 door handle 12a latch 12b latch 13 magnetron drive circuit 15a door switch 15b door switch 16 power switch 19 magnetron 20 latch mechanism 22 spring 23 Arm 23a Operating Piece 26 Spring 27 Locking Part 31 Electromagnetic Coil

Claims (1)

[Claims] 1. A main body having an opening and provided with at least a high-frequency heating means and a control section, and a door for opening and closing the opening of the main body. The power supply circuit of the high-frequency heating means by opening and closing the door. In a heating cooker for turning on and off, a switch provided in a power supply circuit of the high-frequency heating means and a switch provided in the power circuit of the high-frequency heating means are opened and closed and the door is locked on the rear surface of the locking hole provided in the front plate of the main body. A latch mechanism arm is provided, and the door is provided with a latch mechanism latch that is interlocked with a door handle and is fitted into a locking hole of the main body. A heating cooker characterized in that an electromagnetic coil for attracting the arm is provided in response to a command.