JPS6316012B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooking device having a function of measuring objects to be heated.

Generally, the heating time of a heating cooker is determined by the weight of the object to be heated. Therefore, when setting the heating time, it is necessary to know the weight. However, the conventional method uses a separate scale separate from the device to measure weight. This was inconvenient because it was difficult to find a place to put the scale, and it took time and effort to find and take out the scale each time a measurement was to be made. Therefore, a heating cooker having a built-in scale has been proposed. An example is shown in FIG. In FIG. 1, a weighing pan 2 is installed on the upper surface of a main body 1, on which an object to be heated is placed, and its weight is measured and displayed on a display section 3.

Cooking appliances incorporating various types of scales have still been proposed, but they are not easy to use because of the protruding parts like the scale plate 2 mentioned above, and they also have complex structures. There were flaws.

It is an object of the present invention to improve the above-mentioned drawbacks and provide an easy-to-use and practical heating cooker.

The present invention includes a heating chamber that stores an object to be heated, a heating device that heats the inside of the heating chamber, and a mounting table that directly or indirectly places the object to be heated in the heating chamber, and An elastic body that deforms according to the weight of the heated object placed thereon is provided at the bottom of the mounting table, and a weight detection element is provided on the elastic body to detect the weight of the heated object. This provides an economical cooking device with a simplified configuration of the measuring section.

An embodiment of the present invention will be described below based on the drawings.

In FIG. 2, the external appearance of the high-frequency heating device is shown, and numeral 4 is a door provided in the main body 1 that can be opened and closed. Reference numeral 5 denotes a heating chamber in which the object to be heated 6 is housed, and a mounting table 7 on which the object to be heated 6 is placed is disposed on the bottom surface of the heating chamber. Reference numeral 8 denotes an operation panel, which includes a keyboard 9 of the display section 3.

In FIG. 3, a shaft 10 passing through the bottom of the heating chamber 5 is integrally formed on the mounting table 7. The tip of the shaft 10 is supported by a leaf spring 11 which is an elastic body. Further, the leaf spring 11 is supported at both ends by spacers 12 and 13 fixed to the bottom of the main body 1, that is, supported like a beam on both sides. 14
is a cooking tray on which the object to be heated 6 is placed, and is placed on a placing table 7. 15 is a bearing, and leaf spring 1
It is fixed on 1. A bush 16 is provided on the inner surface of the bearing 15 in contact with the shaft 10 of the mounting table 7. The bush 16 is made of resin and is press-fitted to reduce friction with the shaft 10. Further, a magnetron 17 that supplies high frequency energy into the heating chamber 5 is disposed outside the upper surface of the heating chamber 5 .

Cooking in the heating chamber 5 → When the heated object 6 is placed on the saucer 14, the elastic plate spring 11 supporting the shaft 10 of the mounting table 7 due to the weight of the heated object 6 is heated according to Hook's law. The object 6 is deflected and deformed in proportion to its weight. The weight of the object to be heated 6 is to be measured using the difference in the amount of deformation of the leaf spring 11 when the object to be heated 6 is housed in the heating chamber 5 and when it is not housed.

FIG. 4 shows a state in which the weight detection element 18 is attached to the leaf spring 11. When the leaf spring 11, which is an elastic body, deforms and generates strain, the weight detection element 18 senses this strain and changes it into electrical resistance. You are using something that has the property of converting.

The operating principle of the weight detection element 18 will be explained with reference to FIG. Figure a shows a state in which the object to be heated 6 is not housed in the heating chamber 5, that is, the weight of the object to be heated 6 is not on the leaf springs 11 supported at both ends. Figure b shows the state when the object to be heated 6 is housed in the heating chamber 5. Assuming that the weight of the object to be heated 6 is W, the center portion of the leaf spring 11 in contact with the shaft 10 is most deformed as shown in the figure. big. The leaf spring 11, which is an elastic body, deforms in proportion to its weight, so if the relationship between the weight W and the deformation of the leaf spring 11 is calculated in advance, the object to be heated 6
Even if the weight of the heated object 6 is not known, the weight of the heated object 6 can be calculated from the amount of deformation of the leaf spring 11.

In addition to the double-sided beam method described above, if the leaf spring 11 is made to have a cantilever type as shown in FIG. Although this method has drawbacks such as the relationship between the weight of the heated object 6 and the amount of deformation of the leaf spring 11 is not one-dimensional, is more complicated than the above-mentioned method, and is sensitive to vibrations, it is possible to implement it.

As mentioned above, there is a difference in the amount of deformation of the leaf spring 11 when the heated object 6 is housed in the heating chamber 5 and when it is not, so the weight detection element 1 attached to the leaf spring differs.
The electrical resistance 8 also changes in proportion to the amount of deformation of the leaf spring 11. This amount of change in resistance is electrically extracted and the weight of the object to be heated 6 is measured.

Further, as mentioned above, the bearing 15 is connected to the shaft 1 of the mounting table 7.
A resin bushing 16 is press-fitted into the inner surface that contacts the shaft 10 to reduce friction with the shaft 10, and this bearing 15 is fixed to the leaf spring 11. Therefore, the bearing 15 and the leaf spring 11 are assembled into the main body 1 as a unit. When the object to be heated 6 is placed at the center of the mounting table 7, there is little effect of frictional resistance between the shaft 10 of the mounting table 7 and the bush 16 of the bearing 15.
However, when placed at the edge, contact resistance between the shaft 10 and the bush 16 acts, resulting in a measurement error compared to when placed at the center. In this case, when the weight of the object to be heated 6 is small, there is almost no measurement error between placing it in the center and placing it at the edge, but when the weight is large, the measurement error increases depending on the placement position. In other words, when the weight of the object to be heated 6 is small, the error in the heating time set based on the measured weight is small, so the difference in the finished state is small and good. On the other hand, when the weight is large, the difference in heating time is large, so we tend to think that the difference in finished product is also large, but in reality, when the weight is large, the difference in heating time does not directly affect the difference in finished product. First, the finished state can be made almost uniform.

Next, the control circuit in the above configuration will be explained based on FIG. 6.

In the figure, a high voltage transformer 22 is connected via a power fuse 19, a door switch 20 that is linked to the opening and closing of the door 4, and a relay contact 21. The high voltage transformer 22 is connected to the magnetron 17 via a capacitor 23 and a diode 24. 25 is a control board, to which voltage is supplied by a low voltage transformer 26. A microcomputer 27 is provided on the control board 25, and a signal from the keyboard 8 is sent to the microcomputer 27 via a converter 28.
Convert to a signal for use. microcomputer 27
displays this signal content on the display section 3. The microcomputer 2 receives a signal from the keyboard 9.
7 outputs an output signal according to a pre-stored program, and the output signal operates the relay coil 30 via the converter 29 to open and close the relay contacts. The converter 31 converts the signals of the 18 weight detection elements into signals for the microcomputer 27. The microcomputer 27 calculates the weight of the object to be heated 6 from this signal and displays it on the display section 3.

Hereinafter, an example of the operation of the heating cooker will be explained based on FIG. 7.

An operation panel 8 provided on the front surface of the main body 1 is provided with a keyboard 9 and a display section 3 composed of a fluorescent display tube, a liquid crystal display tube, or the like. The keyboard 9 includes a cooking selection key 32 for selecting the type of cooking.
will be established.

When the object to be heated 6 is not stored in the heating chamber 5, the display section 3 displays Og. The object to be heated 6 is placed in the heating chamber 5.
, the weight detection element 18 attached to the elastic leaf spring 11 detects the weight of the object to be heated 6, and the weight of the object to be heated 6 is displayed on the display section 3. Moreover, if the microcomputer 27 is previously stored in the relationship between weight and heating time depending on the type of cooking, the type of cooking can be selected using the cooking selection key 32.
Then, by operating a start key to start cooking, the most suitable heating time for the type of cooking is displayed on the display section 3. As the heating progresses, a countdown will appear and the remaining time will be displayed. Therefore, the heating time can be automatically set and cooking can be performed without setting the heating time each time.

The above embodiment has the following effects.

(1) Measuring the weight of the object to be heated 6 with the plate spring 11 attached to the bottom of the main body, which is the lower part of the mounting table 7, is a measure of the temperature inside the heating chamber 5 such as an electric heating cooking device or a heating cooking device using combustion such as gas. Even in the case of a heating cooker that cooks at high temperatures, the vicinity of the elastic leaf spring 11 and the weight detection element 18 do not reach high temperatures, so errors due to temperature changes are less likely to occur and accurate measurements can be made. Furthermore, since there is no need for temperature correction, the structure is simplified.

(2) Axis 10 of mounting table 7 passing through the bottom of heating chamber 5
Measuring the weight of the heated object 6 using the elastic leaf spring 11 supporting the heated object 6 improves sensitivity because the weight of the heated object 6 is directly transmitted to the leaf spring 11, and even small-weight heated objects 6 can be measured. It is possible to do so.

(3) The configuration of conventional scales has a large number of parts and a complicated structure, and the installation space for the scale also requires a large space depending on the number of parts, making it difficult to actually realize it. The configuration of the measuring section of this embodiment is as follows: leaf spring 1
1, weight detection element 18, mounting table 7, bearing 15,
Since the spacers 12 and 13 and the number of parts are small, and the leaf spring 11, which is an elastic body, is used, it can be installed in a small space, and there is no need to increase the height of the main body, making it extremely practical.

(4) Since the elastic plate spring 11 is supported at both ends, the entire weight of the heated object 6 is not applied to each support portion. Therefore, the support portion does not require much strength, and since the weight of the object to be heated 6 is supported by both end supports, stability against vibrations and the like is high.

(5) Since there is no need to provide a protrusion on the outside of the main body 1, the top surface of the main body 1 can be used as a stand for placing things used in the kitchen, and can also be used as a place to install a heating cooker. If there is no problem in storing the heated object 6, it can be installed in a slightly higher place, such as on top of a refrigerator that is not normally used.
You can use the kitchen space effectively.

Although the above-mentioned embodiment shows an example using the microcomputer 27, it may be selected as appropriate depending on the operation content, and if the control is simple, an electronic circuit made of general parts can be sufficient to achieve the same effect. I can demonstrate it.

Furthermore, in the above-mentioned embodiment, an example was shown in which one weight detection element 18 was used, but the bearing 15 of the leaf spring 11
It is also possible to use a detection circuit that is attached to each side of the body and detects the weight based on the total amount of deformation. Such a configuration has the effect of reducing measurement errors regardless of whether the object to be heated 6 is placed at the edge or the center of the mounting table 7.

As described above, according to the present invention, by simply placing an object to be heated on a cooking tray and placing it on a mounting table, the weight is detected, and at the same time, the output, cooking time, cooking program, etc. are automatically set, and cooking is performed automatically. It is possible to provide an excellent heating cooker that not only eliminates the need for conventional weighing work using a scale, but also cooks automatically by simply storing it in the heating chamber, which is extremely easy to use and does not take up much installation space. .

In addition, in the present invention, the weight detection element is mounted on an elastic body outside the heating chamber, which is separate from the mounting table installed in the heating chamber where the temperature becomes high. The stand can be easily installed in the heating chamber. Furthermore, the control circuit operated by the signal from the weight detection element can be adjusted without fixing the heating chamber, resulting in extremely good workability.

[Brief explanation of the drawing]

Fig. 1 is a front view of a conventional high-frequency heating device with a weight measurement function, Fig. 2 is a front view of a high-frequency heating device with a weight measurement function showing an embodiment of the present invention, and Fig. 3 is a door of the same device. 4 is a perspective view of the main parts of the weighing section of the device; FIGS. 5 a, b, and c are diagrams explaining the operating principle of the weight detection element of the device; FIG. 6 is the control circuit diagram of the device,
FIG. 7 is an external perspective view of the main parts of the operating section and display section of the device. 3...Display section, 5...Heating chamber, 6...Heated object, 7...
Mounting table, 10... Axis, 11... Leaf spring (elastic body), 1
8... Weight detection element.

Claims (1)

[Claims] 1. A heating chamber that stores an object to be heated, a heating device that heats the inside of the heating chamber, and a mounting table provided in the heating chamber and on which the object to be heated is directly or indirectly placed; An elastic body that deforms according to the weight of the heated object placed thereon is provided outside the heating chamber at the bottom of the mounting table, and a weight detection element that detects deformation of the elastic body is provided on the elastic body, A heating cooker comprising a control circuit that controls the output and heating time of the heating device based on the signal from the weight detection element.