JPS63161323A - Heating cooker with weight detecting function - Google Patents

Abstract

PURPOSE:To enable execution of optimum heating cooking, by a method wherein the weight of a food in a heating chamber is detected, and a heating time, a heating output, and a heating mode, which responds to the weight, are automatically controlled. CONSTITUTION:A command, inputted to input terminals I1-I4 of a microcomputer 27 from a key control input part, is decoded in the microcomputer 27, and given display is made by a display part 35. Meanwhile, the load of a food and a mount table is applied on a pressure sensor 21, and a change in an electrostatic volume responding to the load is produced. The electrostatic volume is converted into frequency by means of an oscillating circuit 31, and the frequency is counted by means of the microcomputer 27. A relative correlation between the frequency and the weight is stored in the microcomputer 27, and a weight is determined from the counted frequency. An optimum heating output, heating time, and heating mode which responds to the weight, are stored in the microcomputer 27, and on the basis of the data, a signal by means of which outputs from a magnetron 17 and a heater 18 are controlled is outputted to a driver 32.

Description

Detailed Description of the Invention: Industrial Application Field The present invention detects the weight of food in a heating chamber and automatically controls the heating time, heating output, heating style, etc. according to the weight, thereby achieving optimal heating. This invention relates to a cooking device that enables cooking.

2. Description of the Related Art For example, in the conventional heating cooker shown in FIG. 9, the user weighs the food and inputs the measured weight using the key operation input section 36, thereby determining the optimal heating time, heating output, etc.
It automatically controlled the heating style, etc. FIG. 10 shows an enlarged perspective view of the display and operation section of a conventional heating cooker. Key operation consists of a display section 35 that displays heating time, heating output, weight of inputted food, etc., selection key 36a for selecting food type and cooking menu, and numerical input key 36b for inputting time and weight. It is composed of an input section 36.

Problems to be Solved by the Invention However, in such a heating cooker, the user weighs the food before storing it in the heating chamber, then stores the food in the heating chamber, and then presses the key. Input section 3
6, it was necessary to input the weight of the previously weighed food. In this way, the tedious work of weighing was required, making it inconvenient to use. Furthermore, if the measured value or the input value becomes a different value due to a user's erroneous operation, the result of the cooking will be poor. Furthermore, if you accidentally enter a large value for a light food,
There was a problem in that the food would be overheated and there was a risk that the food would burn.

The present invention solves these conventional problems by automatically weighing the food in the heating chamber and automatically setting the optimal heating output, heating time, heating method, etc. according to the weight. The purpose of this invention is to eliminate cooking failures due to erroneous operation by determining and controlling heating, and to realize an easy-to-use heating cooker that eliminates measuring work.

Means for Solving the Problems In order to achieve the above object, the heat cooker with a weight detection function of the present invention is provided with a placing table for placing food, and this placing table is connected to a rail extending back and forth on both sides of the heating chamber. The configuration is such that it is received by V. Then, take the mounting table in and out of the heating chamber.
It can be achieved by sliding on the rail.

Furthermore, the mounting table is provided with a step that engages with the rail, and the distance between the left and right rails and the step interval between the mounting tables are set so that the mounting table does not fall from the rail. Furthermore, the edge of the mounting table comes into contact with the side wall of the heating chamber, making accurate weight detection impossible. Therefore, since the edge of this mounting table makes contact with the side wall of the heating chamber, the distance from the side wall of the heating chamber to the rail,
This is a configuration in which the distance from the □ step of the mounting table to the edge of the mounting table is appropriately set.

Function: The heat cooker with a weight detection function according to the present invention can automatically detect the weight of the food in the heating chamber, eliminating the need for the user to weigh and input the weight of the food. In addition, since trays V are provided on the side walls on both sides of the heating chamber, and the mounting table is placed thereon so that it can be slid in and out of the heating chamber, it is easy to attach and take out the mounting table. Furthermore, the weight of the food can be accurately detected without the placing table falling off the rail and without the edge of the placing table coming into contact with the side wall of the heating chamber.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 is a sectional view of a heat cooker with a weight detection function as an embodiment of the present invention, viewed from the front.

As shown in FIG. 1, food 1 is placed on a placing table 3 and stored in a heating chamber 2. This mounting table 3 is placed on a right rail 4a and a left rail 4b provided on both sides of the heating chamber 2. The right rail 4a and the left rail 4b extend in the front-rear direction along the side wall of the heating chamber 2. The mounting table 3 is mounted on the left and right rails /L/48, 4b, and can be slid in and out of the tray in the front and rear directions. A connecting body 6 is provided so that the load of the food 1 and the mounting table 3 applied to the left and right rails A/4a, 4b is transmitted to the outside through the side wall of the heating chamber 2. In a high-frequency heating cooker, the connecting body 5 must be made of a material that is not affected by high frequencies, thereby preventing leakage of radio waves to the outside of the heating chamber.

The load transmitted by the connecting body 6 is held by a supporting mechanism called a donkey pal mechanism. This robber μ mechanism constitutes a parallelogram, the negative side of which is fixed, and the opposite side of the fixed side moves in parallel. That is, the parallel movement fitting 6, the fixed holding fitting 9, and the two parallel holding fittings 7.
This forms a parallelogram, and each component is fixed at its four corners with connecting pins 8 so that it can move in parallel. The fixed holding fitting 9 is fixed to the wall of the heating chamber 2, and the parallel movement fitting 6 corresponding to the opposite side thereof is configured to move in parallel. The connecting body 5 is fixedly attached to this parallel movement fitting 6. A load is applied to this parallel motion fitting 6 in the vertical direction. The load of the left and right parallel motion fittings 6 is lifted upward by a hanging fitting 10, and further, the left and right loads are combined and converted in the same direction by a direction conversion fitting 11. This direction conversion fitting 11 is connected to the connecting pin 8
is attached to the direction conversion holding fitting 13, and the hanging fitting 10 and the load coupling fitting 12 are attached at a 90° position using the connecting pin 8 as a fulcrum. Then, the loads on both the left and right sides are concentrated on the load coupling fitting 12, and the load direction is applied from left to right in FIG. The load on this load coupling fitting 12 is detected by a weight detection unit 14.

The heater 18 as a heat source can be attached to the lower side of the heating chamber 2, allowing efficient cooking with good heat distribution. Further, in the case of using high frequency waves, a high frequency supply port 16 can be provided at the bottom of the heating chamber, and is connected to the magnetron 17 through a waveguide 38.

Now, in the above configuration, it is necessary for the mounting table 3 to stably rest on the rails on both sides, and it is also necessary to enable the mounting table 3 to be taken in and out of the heating chamber 2 in a sliding manner. This requires the following configuration.

First, a step 3a is provided to limit displacement in the left and right direction so that both edges of the mounting table 3 are fitted along the left and right sides.
Extend the rails 3b from a to both sides, and attach the left and right rails 4a, 4.
Configure it so that it appears on page b.

Now, at this time, in order to place it stably, there must be 3 steps on both the left and right sides.
The relationship between the distance a, that is, the distance indicated by A in FIG. 1, and the distance between the portions corresponding to the steps 3a of the left and right rails IV4m and 4b, that is, the distance indicated by B in FIG. 1, is set to be A<H. With the relationship A<B, rails 4a and 4b on both sides
Both sides 3b of the mounting table 3 are placed on the table 3 and stabilized. If A) and B were to be the opposite, the step 3a would ride up on either the left or right rails 4b, 4a, causing an unstable situation such as tilting.

Next, in order to prevent the mounting table 3 from falling from the rails 4a and 4b on both sides, the sum of the distance between the steps 3a on both sides and the width of one rib 3b, that is, the distance indicated by (A+C) in FIG. The relationship between the distance between the steps of the left and right rails 4b and 4a, that is, the distance indicated by B in Figure 1, is (A+C).
) B. If this relationship does not exist, depending on the position of the mounting table 3, the left and right Rays IV4b, 4
a Fall down.

Furthermore, if the flange 3b of the mounting table 3 comes into contact with the side wall of the heating chamber 2, it may affect the detection of the amount of electricity, making it impossible to accurately detect the weight. To eliminate this, use the left and right rails 4.
The relationship between the distance from the step corresponding to each of a and 4b to the side wall of the heating chamber 2, that is, the distance shown in Figure 1, and the width of the brim, that is, the distance shown as C in Figure 1, is D)C. It is.

As described above, by setting the distance relationship shown by A-D in FIG. 1, the mounting table 3 can be stably mounted on the left and right rails
, 4a for accurate weight measurement. Also, heating chamber 2
It is also possible to smoothly take in and take out the mounting table 3 from the inside.

FIG. 2 shows a perspective view of the main parts of the heat cooker with a weight detection function according to the present invention. As shown in Figure 2, the food 1 is placed on the placing table 3.
It is shown that the load is received by the rails 4a and 4b on both the left and right sides. The rails 4a and 4b on both the left and right sides extend back and forth on the side walls of the heating chamber 2, and the mounting table 3 can be moved in and out of the heating chamber 2 by sliding thereon. In addition, each of the left and right rails 4a, 4b is supported by a connecting body 5 at two places, the upper front and the rear.
It is held in place by a donkey pal mechanism. The parallel movement fittings 6 of the two front and rear donkey pal mechanisms are integrally constructed and are suspended by a hanging fitting 1o.

FIG. 3 shows a state in which the load of the mounting table 3 is received by the left rail 4b and transmitted to the outside of the heating chamber 2 by the connecting body 5, and the load is supported by the donkey pal mechanism. The reason why the donkey pal mechanism is used for this supporting part will be explained based on the drawings.

FIG. 3(a) shows the case where a donkey pal mechanism is used,
Fig. 3 (bl) shows a case where a lever-shaped fixture 39 is used instead of the donkey pal mechanism.First, the first reason for using the donkey pal mechanism is that when the donkey pal mechanism is displaced vertically, the In Figure 3(a), parallel movement is performed and the left rail 4
The upper surface of b is displaced without tilting. However, Figure 3 (bl
In this case, since it rotates around the fulcrum C, the upper surface of the left side rail A/4b is tilted, resulting in an unstable state. The second reason is that the location where the load is applied, that is, the position of point A, does not affect the weight measurement in FIG. 3(,), but does affect the weight measurement in FIG. 3(b).

That is, in FIG. 3(a), even if the position of point A changes from side to side, the load applied to the hanging fitting 10 at point B does not change. This is one of the characteristics of the donkey-pal mechanism and is generally known. However, in FIG. 3(b), a lever is formed with the 0 point as the fulcrum and determined by the ratio of the length between C and A and the length between C and B. Therefore, the lever 10 at point B is This load changes greatly as the position of point A changes from side to side. Robarba V is used for these two major reasons.

FIG. 4 is a perspective view of a main part showing the structure of the weight detection unit 14. As already explained with reference to FIG. 1, the explanation has been made until the load of the food 1 placed in the heating chamber 2 is collected on the load coupling fitting 12. In FIG. 4, a configuration for detecting the load collected on the load coupling fitting 12 will be explained.

A force is applied to the load coupling fitting 12 in the direction shown by the arrow, and this force is stopped by the lever fitting 19. This te.

The metal fitting 19 uses a fulcrum metal fitting 20 as a fulcrum, and is supported by a pressure sensor 21 on the opposite side of the fulcrum. Therefore, the force applied to the pressure sensor 21 is a value divided by the lever fitting 19. Further, the fulcrum fitting 20 and the pressure sensor 21 are fixed to the sensor base and positioned accurately. Furthermore, the connection portion between the load coupling fitting 12 and the lever fitting 19, the connection point between the lever fitting 19 and the fulcrum fitting 20, and the lever fitting 19 are connected to the pressure sensor 21.
The shape of the pressing point etc. is blade-shaped, and the shape is such that it does not cause positional deviation or change in length.

FIG. 5 shows a sectional view showing the structure of the pressure sensor 21. As shown in FIG. It has a structure in which a pressure sensitive plate 23 and a substrate 24 are pasted together in parallel at regular intervals via a spacer 25, electrodes 26 are provided on each opposing surface of the pressure sensitive plate 23 and the substrate 24, and lead wires are drawn out from each electrode 26. . Then, the pressure sensitive plate 23 is deformed by applying force in the direction shown by the arrow in FIG.
3 and the substrate 24 changes. Therefore, pressure plate 2
The distance between a and the electrode 26 provided on the substrate 24 changes, and the capacitance between the electrodes changes. Furthermore, since the pressure sensitive plate 2a deforms in response to the force applied thereto, the capacitance also changes in response to the force. By detecting this change in capacitance, the weight of the food 1 in the heating chamber is detected.

FIG. 6 shows an oscillation circuit 31 that converts changes in capacitance of this pressure sensor 21 into changes in oscillation frequency. Two operational amplifiers OP1 and OF2 are used to convert changes in charging/discharging time to the capacitance of the pressure sensor 21 into an oscillation frequency. FIG. 7 shows the output waveforms of the operational amplifiers OP1.0P2. FIG. 7(a) shows the voltage waveform at the output point B of the operational amplifier OP2, and FIG. 7(b) shows the voltage waveform at the output point A of the operational amplifier OP1. OF2 constitutes an integrating circuit, and its input is the output of OPI. In addition, OPI constitutes a comparator circuit with hysteresis characteristics, and the input is O
The output of F2 is used as input. In this way, a loop is constructed to constitute an oscillation circuit. FIG. 8 is a circuit diagram showing a specific configuration of a control circuit for a heat cooker with a weight detection function as an embodiment of the present invention. The center of control is composed of the microcomputer 27, and input terminals 11~! of the microcomputer 27 are input from the key operation input section. 4 is decoded within the microcomputer 27, and a predetermined display is displayed on the display section 35.

On the other hand, the pressure sensor 21 is loaded with the load of the food 1 and the mounting table 3, and shows a corresponding change in capacitance.

This capacitance is converted into a frequency by the oscillation circuit 31, and the frequency is counted by the microcomputer 27.

The microcomputer 27 stores the correlation between this frequency and weight, and calculates the weight from this counted frequency. Further, the microcomputer 27 stores the optimal heating output, heating time, and heating style corresponding to the weight, and outputs a signal to the driver 32 to control the output of the magnetron 17 and the heater 18 based on this. The driver 32 is connected to a heater control relay 34 that controls the heater 18 and a magnetron control relay 33 that controls the magnetron 17. In addition, the magnetron 17 has a high voltage transformer 28 and a high voltage capacitor 2.
9. Oscillation is caused by a high voltage generation circuit constituted by a high voltage diode 30.

As described above, according to this embodiment, the heating output, heating time, heating pattern, etc. of the food are automatically controlled just by placing the food in the heating chamber, and an easy-to-use heating cooker can be realized. In addition, the mounting table can be slid on the left and right rails to be taken in and out, making it easy to take food in and out.

In addition, the mounting table can be stably placed on the rails on both the left and right sides.
An easy-to-use cooker that does not fall or get stuck on top of itself can be created.

This allows accurate weight detection without the mounting table touching the heating chamber wall. This improves the quality of cooking.

Effects of the Invention As described above, the heat cooker with a weight detection function according to the present invention provides the following effects.

(1) Since food can be taken in and out of the heating chamber in a sliding manner, an easy-to-use cooking device can be created.

(2) The mounting table can be stably placed on the left and right rails.

(3) The mounting table does not fall from the left and right rails, allowing accurate weight detection.

(4) Accurate weight detection is possible without the mounting table touching the side wall of the heating chamber.

[Brief explanation of the drawing]

Fig. 1 is a front cross-sectional view of a heat cooker with a weight detection function according to an embodiment of the present invention, Fig. 2 is a perspective view of the main part thereof, and Fig. 3 is a partial cross-section of the support mechanism section that supports food. Figure 4 is a perspective view of the main parts of the weight detection unit, Figure 5 is a sectional view showing the structure of the pressure sensor, Figure 6 is a circuit diagram of the oscillation circuit, and Figure 7 is its output waveform diagram. , FIG. 8 is a control circuit diagram of the same weight detection function added heat cooker, FIG. 9 is an external perspective view of the conventional heat cooker, and FIG. 10 is an enlarged perspective view of the same main part. 1... Food, 2... Heating chamber, 3...
...Placement stand, 3a...Step, 3b...
・Brim, 4a...Right rail, 4b...
・Left rail, 5...Connection body, 6...
Parallel motion fitting, 7...Parallel holding fitting, 8...
... Connecting pin, 9... Fixed holding fitting, 10.
...hanging fitting, 11...direction conversion fitting,
12... Load coupling fitting, 13... Direction conversion holding fitting, 14... Weight detection unit, 1
5... Screw, 16... High frequency supply port, 17... Magnetron, 18... Heater, 19... Lever fitting, 20 ...Fullin fitting, 21...Pressure sensor, 22...
・Sensor base, 23... Pressure sensitive plate, 24...
...Substrate, 25...Spacer, 26...
...Electrode, 27...Microcomputer, 2
8... High voltage transformer, 29... High voltage capacitor, 30... High voltage diode, 31...
...Oscillation circuit, a2...Driver, 33.
...Relay for magnetron control, 34...
・Heater control relay, 35...Display section, 36
...Key operation input section, 36a...Selection key, 36b...Numeric value input key-137...
...Door, 38...Conduit, 39...
Rod-shaped metal fittings. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 5
Figure 7 Point b ■, Nori Tomogata Figure 9 Figure 10

Claims (4)

[Claims] (1) a heating chamber for storing food, a heating device for heating the food, and a mounting table for placing the food;
A rail that receives the load of the food and the placing table and extends in the front-rear direction and is located on both sides of the heating chamber, a means for transmitting the load applied to the rail to the outside of the heating chamber, and a means for transmitting the load to the outside of the heating chamber. and a control means for controlling the output of the heat source or the high-frequency oscillator based on the detected weight, and the device is configured such that both edges of the mounting base are fitted along the rails. A heat cooker with a weight detection function, which has a structure in which a step is provided to restrict displacement in the left and right direction, and a collar is provided so as to rest on the rail toward both sides from a portion of the step that contacts the rail. (2) The heat cooker with a weight detection function according to claim 1, wherein the spacing on both sides of the portion of the step that contacts the rail is smaller than the spacing on both left and right sides of the portion of the rail that contacts the step. (3) The heat cooker with a weight detection function according to claim 1, wherein the width of the brim is smaller than the distance from the side wall of the heating chamber to the part corresponding to the step of the rail. (4) Heat cooking with a weight detection function according to claim 1, wherein the sum of the distance on both sides of the step and the width of one side of the brim is larger than the distance on both sides of the portion of the rail that corresponds to the step. vessel.