JPH035493B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a cooking device such as a microwave oven.

Conventional Structure and its Problems FIG. 1 is a sectional view showing the structure of a conventional heating cooker. In FIG. 1, a door 2 is provided at the front of a heating chamber 1 so as to be openable and closable. A waveguide 3 is connected to the heating chamber 1, and a magnetron 4 as a heating source is provided to this. Radio waves oscillated from the magnetron 4 are irradiated into the heating chamber 1 via the waveguide 3. The object to be heated 5 is placed on a rotating plate 6, and is rotated by a motor 7 during heating to uniformly heat the object. This allows the object to be heated 5 to be heated by radio waves, but according to such conventional heating cookers, the user can set the heating time according to the amount and weight of the object to be heated 5 using a time switch or the like. It was a pain to have to set it up each time.

FIG. 2 is a partial sectional view showing another example of the structure of a conventional heating cooker. In FIG. 2, the object to be heated 8 is placed on a rotating plate 9, and the rotating plate 9 is placed on a rotating mounting table 10. A rotary mounting table 10 is supported by a shaft 11, and this shaft 11 is held freely rotatable and movable in the thrust direction by a bearing A12 and a bearing B13. A gear A14 is provided on the shaft 11, and the motor 1
It is coupled with the gear B16 provided at No. 5 and is driven to rotate. Further, the shaft 11 is configured to receive a load in the load direction by a support plate 18 supported by a spring 17. The support plate 18 moves according to the weight of the object to be heated 8 to a position where it is balanced with the spring 17. The rotary mounting table 10 and the support plate 18 are shown with a solid line when there is no object to be heated 8, and with a two-dot chain line when the load of the object to be heated 8 is applied.

By detecting the movement and position of the support plate 18, the weight of the object to be heated 8 can be detected. The operation of the magnetron, which is the heating source, can be controlled based on this detection output, and heating can be performed according to the amount and weight of the object to be heated, which is convenient because there is no need to set the heating time.

However, according to such a conventional heating cooker, the rotating plate 9 and the rotating mounting table 10 are raised to the position shown by the solid line when there is no load, so when the door is opened and the rotating plate 9 is taken out of the heating chamber, Moreover, it is difficult to pull out because there is a step between the bottom of the heating chamber and the door. Further, since the rotary mounting table 10 is supported by a spring 17, it moves vertically when the rotary plate 9 or the object to be heated 8 is placed on it, making it unstable, making it inconvenient to use, and having an unfavorable operating feel. It was hot.

Purpose of the Invention The present invention solves the above-mentioned drawbacks of the conventional technology, and provides a simple structure, improved usability, accurate weight measurement, and stable heating without setting a heating time. The purpose is to

Structure of the Invention In order to achieve the above object, the heating cooker of the present invention supports a rotary mounting table with an elastic body, and is provided with a weight detection device constituted by the rotary mounting table and a detector that detects movement of the elastic body. Therefore, the heating time is automatically determined by measuring the weight of the object to be heated, without having to set the heating time each time, and a push-down mechanism that is linked to the opening and closing of the door is installed.
To provide a structure that pushes down the rotating mounting table when the door is open, and to eliminate the difference in level between the rotating mounting table and the door or the bottom surface of the heating chamber when the door is opened to take out or take out a heated object, and to improve stability. This has the effect of improving usability.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a partial sectional view of the cooking device according to the present invention.

In Fig. 3, there is a door 2 in front of the heating chamber 21.
2 is provided so that it can be opened and closed freely. Radio waves oscillated from a magnetron (not shown) serving as a heating source are irradiated into the heating chamber 21 to heat the object 23 at high frequency.
The object to be heated 23 is placed on the rotating plate 24, and the rotating plate 2
4 is placed on the rotary mounting table 25. The rotary mounting table 25 is directly fitted onto a shaft 28 of a motor 27 that passes through an opening 26 provided in the bottom of the heating chamber 21, and is driven to rotate by the motor 27. The motor 27 is fixed to a block A29, which is connected to a block B31 by a plurality of leaf springs 30, and the block B31 is fixed to the bottom 32 of the main body. Since the block A29, the block B31, and the leaf spring 30 constitute a roberval mechanism, the motor 27 fixed to the block A29 moves vertically and elastically. The block A29 is provided with a magnet 33, and a detection coil 34 is provided opposite to the magnet 33. Due to the action of the Roberval mechanism, the motor 27 moves downward in accordance with the weight of the object to be heated 23. Further, the motor 27 vibrates at a frequency corresponding to the weight of the object to be heated 23 and the elasticity of the leaf spring 30. The detection coil 34 is connected to this magnet 33.
The amount of displacement or vibration frequency is extracted as an electrical signal.

Furthermore, the block A29 is provided with a contact portion 35,
A lever 36 is provided at a position opposite to this, and the other end is opposed to a protrusion 37 provided on the door 22.
38 is a tension spring that pulls up the lever 36 to the position shown by the solid line.

The operation of the above configuration will be explained below.
The weight of the object to be heated is applied to the motor via the rotary mounting table, and since the motor is supported by an elastic body, it shifts downward in accordance with the weight. Furthermore, the motor vibrates at a unique frequency depending on the weight of the object to be heated and the elasticity of the leaf spring. This amount of displacement and frequency are detected by a detection coil, and the overall weight is detected from the output. If the weight of the rotating plate, rotating mounting table, and motor are measured in advance, the weight of only the object to be heated can be detected from the overall weight.

By using this output to control the oscillation of the magnetron, which is the heating source, through the control unit,
It is possible to heat the object for an optimal amount of time depending on the weight of the object to be heated. When the door is open, the protrusion hits the lever, the lever rotates, and the other end pushes against the stopper, pushing block A down. The free state with the door closed is shown by a solid line, and the state with the door open is shown by a two-dot chain line. In the free state, there is a step h between the rotary mounting table and the bottom surface of the heating chamber, but in the door open state, they are on the same level.

FIG. 4 is a partial sectional view showing another embodiment of the cooking device according to the present invention.

In FIG. 4, motor 27' is fixed to block A 29' supported by leaf spring 30'. A contact portion 35' is integrally provided on the block A29', and a magnet 33' is fixed thereto. Similarly, a detection coil 34' is provided opposite the magnet 33'.

An arm 41 is rotatably provided on the door 22'.
By sliding on rollers 42 provided on the main body, opening and closing can be performed smoothly. A door spring 43 is provided on the arm 41 and biased in the pulling direction. This cancels out the weight of the door 22' when opening and closing it, making the operation easier.
ensuring closure. A lever B44 is rotatably supported on a fulcrum 45 at the upper part of the abutment part 35', and the lower end 46 of the lever faces the abutment part 35', and the upper end 47 of the lever is rotatably engaged with the arm 41. .

With this configuration, when the door 22' is open, the lever B44 moves to the position shown by the two-dot chain line. As a result, the lower end of the lever 46 pushes down the abutment part 35', so the motor 27' is also pushed down, and the rotary mounting table (not shown) is pushed down. Since the lever B44 is configured to move by being engaged with the door arm 41, it has a lever effect and has the effect of being able to reliably push down the rotary mounting table with a light force that does not feel any resistance during operation.

Effects of the Invention As described above, according to the present invention, the following effects can be obtained.

(1) When opening the door to take out or take out the rotary plate or heated object, the rotary table is pushed down, so there is no step between the bottom of the heating chamber and the rotary table, and they are all on the same surface. It can be pulled out while sliding. If the door has a front-opening structure and is flush with the inner surface of the door when open, it can be pulled out smoothly from the heating chamber to the top of the door, so if the object is heavy or hot. However, it is safer to operate and the device is easier to use.

(2) When placing a rotating plate or an object to be heated on the rotating mounting table, the rotating mounting table does not vibrate up and down, so it is safe, and there is no need to worry about spilling or unstable objects such as liquids. Since it can be used without feeling, the operation feeling is improved and it is easier to use.

It is also easy to clean the inside of the heating chamber.

(3) When measuring the weight of an object to be heated using the vertical vibration frequency of the object to be heated or a rotary mounting table, the push-down mechanism is released all at once when the door is closed, so it is possible to Vertical vibration occurs and a large signal can be extracted as a signal for the detector, allowing accurate detection. In addition, if a door switch that is linked to the opening and closing of the door is installed, it will be easier to synchronize the timing so that the control unit reads the detector signal at the same time as the door closing signal, allowing more accurate detection and weight measurement. Accuracy will be extremely high.

(4) By measuring the weight of the object to be heated and controlling the operation of the magnetron, which is an oscillator, via the control unit, the optimal heating time can be automatically set without having to set the heating time each time. ,
Convenient and easy to use without any hassle.

Further, if the circuit is configured to prevent so-called dry firing operation, which is inadvertently heating the product when there is no object to be heated, the device will be safer.

(5) Since the mechanism for pushing down the rotary mounting table is configured to be linked to the opening and closing of the door, the operation is carried out naturally and unconsciously during the normal operation of loading and unloading objects to be heated, making it easy to operate and use. .

(6) By using a mechanism in which the lever is operated by the movement of the door arm, the lever acts as a lever and operates with an extremely light operating force, making the device easier to use.

In addition, since it is composed of a combination of an arm and a lever, the position of the push-down part of the lever can be selected freely to a certain extent, so there are fewer structural restrictions such as the motor part, and a simple structural design is possible.
Furthermore, since the door spring also acts as a return force for the lever, there is no need for a separate spring, resulting in an economical construction.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of a conventional cooking device, FIG. 2 is a partial sectional view showing another conventional example of the cooking device, and FIG. 3 is an example of the structure of the cooking device of the present invention. FIG. 4 is a partial sectional view showing another embodiment of the cooking device. 22...Door, 23...Heated object, 25...
Rotating mounting table, 27... Motor, 29... Block A, 30... Leaf spring, 31... Block B, 35
...Attaching part, 36...Lever, 41...Door arm, 44...Lever B.

Claims (1)

[Claims] 1. A heating chamber, a heating source for heating the object to be heated in the heating chamber, a door for opening and closing the heating chamber, a rotating mounting table for placing the object to be heated in the heating chamber, and the rotating mounting table. and a detector for detecting displacement of the rotary mounting table and the elastic body; the door is provided with a push-down mechanism that engages with the rotary mounting table supported by the elastic body; The cooking device has a mechanism configured to push down the rotary mounting table against the biasing force of the elastic body when the door is opened, and the operation of the heating source is controlled by the output of the detector.