JPH0460313B2 - - Google Patents

Description

Detailed Description of the Invention: Industrial Application Field The present invention measures the weight of the object to be heated and controls the heating time, heating temperature, heating output, heating method, etc. according to the weight, thereby achieving automatic heating. The present invention relates to a weight detection device for a heating device that makes it possible to.

Conventional technology For example, in conventional manual type high-frequency heating devices, when reheating cold rice, miso soup, etc., cooking vegetables, or thawing frozen foods, the user measures the weight of the food and calculates the weight. It was necessary to set the heating time and heating output according to the time using a time switch or output selection button. Therefore, it is necessary to perform cumbersome operations such as measuring the weight of the food, setting the heating time, and heating output before starting cooking, and it has been desired to improve the usability.

In addition, high-frequency heating devices with automatic control functions are equipped with sensors, which have been developed in recent years, to detect food surface temperature, water vapor generated from food, etc.
It detects alcohol, etc. and automatically controls food heating time and heating output. However, among these automatic heating devices, those equipped with infrared sensors that detect the surface temperature of food mainly only detect the surface temperature of a part of the food, but cannot detect the internal temperature or heating state. However, the finished product was uneven depending on the shape and weight. On the other hand, products equipped with gas sensors that detect water vapor, alcohol, etc. generated from food can detect good results when reheating or cooking raw vegetables by detecting water vapor, but when thawing, etc. Since it cannot detect food that does not generate steam, it is time-consuming to measure the weight of the food to be thawed, select the timer volume and output selection key, and then start cooking, just like with the manual type.

Therefore, in order to eliminate these shortcomings and to ensure good heating without failure, it was desired to be able to automatically measure the weight of food and cook with the optimal heating time, heating output, and heating method. .

In order to satisfy these demands, various methods for automatically measuring the weight of food have been devised, and some of these methods have been commercialized.

However, when measuring the weight of food, the accuracy of the measuring device is required. Accuracy includes the difference from the true value, variation due to repeated measurements, variation caused by the position of the food, variation caused by the location where the main body is unraveled, and errors caused by the environment such as temperature and humidity.

Naturally, when cooking is performed using values that include such variations and errors, the finished state of the cooked food will not be good.

Therefore, there is a need for a method and structure that can solve these problems and improve the accuracy of food weight measurements and reduce errors.

In the conventional high-frequency heating apparatus shown in FIGS. 2 to 6, for example, in FIG. 2, reference numeral 1 denotes a heating chamber in which food is stored and heated, and a door 2 is provided in front of the heating chamber so as to be openable and closable. 3 is a magnetron that supplies high frequency waves to the heating chamber 1. The high frequency waves oscillated from the magnetron 3 pass through a waveguide 4 and are irradiated onto the object to be heated 6 placed on a rotating plate 5 in the heating chamber 1, thereby heating it. do.
The rotating plate 5 is placed on a rotating mounting table 7. The rotary mounting table 7 is fitted with a shaft 8 passing through an opening provided in the bottom of the heating chamber 1, and the drive of the motor 9 is transmitted to the shaft 8 by two gears 10, 11.
is rotating.

FIG. 3 is a detailed view of the Roberval mechanism, which is a weight detection device, and FIG. 4 is a diagram showing the mechanical parts thereof. Details of the weight detection device will be explained with reference to FIGS. 3 and 4 below.

The structure of the Roberval mechanism is that two aluminum blocks A12 and B13 are connected by a plurality of leaf springs 14. The overlapping surfaces of the aluminum block B13 and the leaf spring 14 are fixed by a holding plate 15, and the overlapping surfaces of the aluminum block A12 and the leaf spring 14 are fixed by a magnet plate 16 and a motor mounting plate 17.

A magnet 18 is fixed to the tip of the magnet mounting plate 16, and a coil 19 is fixed to the aluminum block B13.
is fixed, and the weight is detected by this magnet 18 and coil 19.

Further, a drive motor 21 for rotating a rotating shaft 20 is fixed to the motor mounting plate 17 with screws 22, and a gear A is attached to a shaft 23 of the motor 21.
24 are fitted. The rotating shaft 20 has a gear B2.
5 is fitted into the aluminum block A12, and is housed in a notch in the center of the aluminum block A12. Also,
The rotating shaft 20 is prevented from rattling in the front, rear, left and right directions by a hole provided in the aluminum block A12 and a bearing 32.

The rotation of the drive motor 21 is controlled by the gear A2.
4. It is transmitted to the rotating shaft 20 via the gear B25. Furthermore, a rotary mounting table 27 on which a rotary plate 26 is placed is fitted onto the rotary shaft 20, so that the object to be heated 28 is rotated during high-frequency heating so that it can be heated evenly.

FIG. 5 is a sectional view showing the mounting structure of the Roberval mechanism. In the figure, 13 is an aluminum block B on the fixed end side of the Roberval mechanism, and 30 is its mounting plate.

The aluminum block B13 is attached to a strong metal mounting plate 30 fixed to the bottom surface of the heating chamber 29 with screws 31 to fix one end of the roberval mechanism, and vibrate the other end to which the rotating shaft 20 is attached.

Further, the aluminum block B13 has a convex shape, and the mounting plate 30 has a convex shape, and is fixed at both ends of this convex shape.

In the high-frequency heating device configured as described above, when the object to be heated 28 is placed on the rotating plate 26, its weight is applied to the free end of the Roberval mechanism via the rotating mounting table 27 and the rotating shaft 20, and the weight is adjusted according to the weight. and is displaced downward. This movement is a characteristic of the Roberval mechanism and is always a vertical displacement. When the Roberval mechanism is vibrated by the impact when the object to be heated 28 is placed on it or by the subsequent impact applied to the Roberval mechanism from the outside, it vibrates at a natural frequency corresponding to its weight. Due to this vibration, the magnet 18 fixed to the free end
An induced voltage is generated in the coil 19 fixed to the fixed end, and by detecting it, the entire weight can be measured. Therefore, the rotating plate 26, the rotating mounting table 27, the motor 21, the gears 24, 2
5. If the weight of the aluminum block A is measured in advance, the weight of only the object to be heated 28 can be measured from the total weight.

If the oscillation of the magnetron is controlled according to the weight of the object to be heated 28, cooking can be performed with optimum heating output and heating time.

Problems to be Solved by the Invention However, in a configuration in which weight is measured by vibrating such a Roberval mechanism, as shown in the plan view of the weight detection section in FIG.
The electric wire 33 connected to 1 is covered with a protective tube 34. This protective tube 34 is for protecting the electric wire 32 from metal edges and high temperature parts.
Generally, in such a structure, the electric wire 33 is made of a vinyl chloride material, and the protective tube 34 is often made of a silicon-impregnated glass braided tube for that purpose.

Since the Roberval mechanism has a structure in which the block B13 is fixed and the drive motor 21 side vibrates, the block B1 is fixed so that the electric wire 33 does not interfere with the vibration.
It is pulled out to the 3rd side. The electric wire 33 is held at two locations: a protruding crimp portion 17a of the intermediate motor mounting plate 17, and a holder 36 fixed to the end of the block B13 with screws 35.

However, if the electric wire 33 is not held correctly, for example, the crimp part 17a and the holder 36
If there is a strong tension between the two, the vibration of the Roberval mechanism will be hindered and the vibration will quickly attenuate.

Figure 7a shows the induced voltage generated in the coil 19 at this time, but as the vibration decays quickly, the effective number of pulses decreases, and the number of pulses originally required to measure the weight of the heated object decreases. In this case, cooking will not be possible or optimal heating conditions will not be obtained.

Furthermore, even if careful attention is paid to assembling the Roberval mechanism and incorporating it into the main body of the device, there are limits, and there is a problem in that it is extremely difficult to always obtain an effective number of pulses with enough margin for the required number of pulses. Ta.

The present invention solves these conventional problems, and uses a simple configuration to always accurately measure the weight of the object to be heated, and automatically sets the optimal heating output and heating time to ensure good heating. To provide a heating device that is easy to use, convenient, and highly reliable.

Means for Solving the Problems In order to achieve the above object, the heating device of the present invention measures the weight of the object to be heated and automatically heats it with the optimum heating output and heating time. This heating device is configured to measure the weight of the heated object by the number of pulses per hour, and by removing the influence of the protective tube of the drive motor's electric wire, which was an obstacle to the vibration of the Roberval mechanism, it becomes the basic data for weight calculation. This configuration increases the number of effective pulses and ensures a stable state with sufficient margin for the required number of pulses.

Effect The heating device of the present invention has a sufficient margin in the number of effective pulses required for calculating the weight of the object to be heated, so the accuracy of the measured value is improved, and the lack of effective pulses This also eliminates phenomena that cannot be measured. Also, the influence of the installation location of the heating device,
In other words, even if the device is installed in an unstable location such as on top of a kitchen sink, the number of effective pulses decreases and measurement becomes impossible, but this problem can also be solved.

As described above, since all the problems caused by the lack of effective pulses can be solved, stable automatic cooking can be ensured, and the reliability of the heating device can be further improved.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the drawings. In the description of the conventional example and the embodiment of the invention, the same number indicates the same name.

As shown in the plan view of the Roberval mechanism for measuring the weight of the object to be heated in FIG. 1, the rotating shaft 20 that fits into the rotating mounting table is rotated by the rotation of the drive motor 21 being transmitted through the gear A24 and the gear B25. do. This drive motor 21 consists of four leaf springs 14 and a pair of aluminum blocks A12 and B1.
It is fixed with screws 22 to a motor mounting plate 17 that is integrated with the Roberval mechanism whose basic structure is 3. The aluminum block B13 is the fixed side of the roberval mechanism, and a magnet 18 is fixed to the free end side, and a coil 19 for detecting the amount of displacement of the magnet 18 is fixed to the aluminum block B13. On the other hand, the electric wire 33 of the aforementioned drive motor 21 is connected to the protective tube 3.
4 is overturned, press the crimp part 1 of the motor mounting plate 17.
7a and is held by a holder 36 fixed to the aluminum block B13 with screws 35. The protective tube 34 is cut between these two holding portions and is discontinuous.

In the embodiment, the electric wire 33 is a PVC electric wire, and the protective tube 34 is a silicon-impregnated glass braided tube, which is cut at two places and is discontinuous. The total gap between the cuts is kept within a few mm.

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

(1) By significantly reducing the influence of the drive motor's electric wire and protective tube, which were factors that impede the vibration of the Roberval mechanism, the effective number of pulses can be reduced compared to the number of pulses required for weight measurement. It increases as shown in Fig. 7b. This allows a sufficient margin for the number of pulses, eliminating the conventional phenomenon of inability to measure due to insufficient number of pulses, and greatly improving reliability.

(2) Previously, when assembling the Roberval mechanism or assembling it into the device body, the tension of the wires changed and there was a problem due to an insufficient number of pulses, but the increase in the number of effective pulses increases the margin, making it possible to perform such work. The impact of

(3) The effective number of pulses tends to decrease when the heating device is placed in an unstable or soft location, but even in such cases, the influence of the increased margin for the required number of pulses is reduced. becomes difficult to receive.

(4) As mentioned above, all the problems caused by not being able to maintain a sufficient margin in the number of effective pulses can be solved, and stable weight measurement results can always be obtained.
In addition, measurement accuracy can be further improved, so the performance of automatic heating, which measures the weight of the object to be heated and automatically sets the heating output and heating time, is improved, and the finished product can be made in a better condition.

[Brief explanation of drawings]

Fig. 1 is a plan view of the weight detection section of a heating device according to an embodiment of the present invention, Fig. 2 is a partial sectional view showing the structure of a conventional heating device, and Fig. 3 is a weight detection section of the heating device. 4 is an exploded view of the heating device, FIG. 5 is a partial sectional view showing the mounting structure of the weight detection portion of the heating device, and FIG. 6 is the weight detection portion of the heating device. FIG. 7 is a characteristic diagram showing signals generated in the weight detector. 12... Aluminum block A, 13... Aluminum block B, 14... Leaf spring, 18... Magnet, 19
...detection coil, 20 ... rotary shaft, 21 ... drive motor, 24 ... gear A, 25 ... gear B, 2
6...Rotary plate, 27...Rotary mounting table, 28...Heated object.

Claims (1)

[Claims] 1. A heating chamber in which an object to be heated is cooked by a heating means, a rotating mounting table on which the object to be heated is placed in the heating chamber, and a motor driving the rotating mounting table;
It includes an elastic body that integrally supports the rotary mounting table and the motor, a detector that detects vibrations of the elastic body, and a control device that controls a heating means, and the elastic body is a robot valve made of a plurality of leaf springs. The mechanism is configured such that a detector detects the weight of the object to be heated on the rotary mounting table, and the operation of the heating device is controlled by the output of this detector, and the electric wire connected to the motor is covered with a protective tube. The heating device is configured such that the protective tube is held on a fixed side of the elastic body and is discontinuous between the holding portion and the motor.