JPS6339814B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating device capable of measuring the weight of an object to be heated in a heating chamber.

In heating devices, the heating time is often affected by the amount of the object to be heated. This tendency is especially noticeable when using microwave heating.
Many methods have already been proposed for detecting the weight of the object to be heated and calculating the heating time based on this.
In particular, it would be ideal to be able to detect the weight of an object to be heated at the same time as it is placed in the heating chamber using a table for placing the object to be heated, and various inventions and ideas have focused on this point, but none of them It has not been put into practical use. This was due to the fact that the various structural obstacles to production could not be sufficiently removed, and all of them remained at the idea stage.

To give an example, FIG. 1 shows a microwave heating device described in Japanese Patent Application Laid-Open No. 54-31648. A magnetron 2 serving as a heating means is coupled to the heating chamber 1, and a rotary table 4 serving as a mounting table for rotating the object 3 to be heated is provided within the heating chamber 1.

Now, this rotary table 4 can freely move in the thrust direction of the drive shaft 5, and is supported at the bottom by a bearing 6 and a support table 7. A load sensor 8 is attached to this support base 7, measures the weight of the object to be heated 3, and controls the control unit 9.
Enter data into. The control unit 9 controls the magnetron 2 based on this data to perform optimal heating. Reference numeral 10 indicates a door body provided at the opening of the heating chamber so as to be openable and closable, and 13 indicates a stirrer fan.

However, this conventional configuration has several drawbacks. First, since the drive shaft 5 is required to have mechanical strength, it is difficult to use a non-metal, and since metal is generally used, the metal drive shaft 5 passes through the heating chamber, increasing the amount of radio wave leakage. Even if the chain yoke 11 is constructed around the drive shaft 5, it is difficult to reduce this to a sufficient level. In addition, the structure of the gear 12, bearing 6, support base 7, etc. that engages and slides with a motor (not shown) is large-scale, and there are problems in terms of reliability, and of course the cost is high. Cleaning the inside of the heating chamber is also extremely difficult.

In other words, in order to realize this invention, it is first necessary to consider a structure that does not leak radio waves. Next, if the weight of the heated object is to be measured on the rotary table 4 (so-called turntable) as in this example, the structure that allows the heated object to be placed stably and rotated reliably should be constructed as simple as possible. It is necessary to specify it in the composition.

In view of this background, the present invention has no radio wave leakage,
In addition, a heating device is realized that has a scale function that allows the object to be heated to be stably placed when rotating the object.

The configuration of the present invention will be explained below with reference to the drawings.

FIG. 2 is a sectional view of a heating chamber showing an embodiment of the present invention. The rotary table 4 has a search axis 14 which is a search means.
and two leaf springs 15. A load sensor 8 is fixed to the leaf spring 15 and measures the weight of the object 3 to be heated, and inputs the data to the control section 9.

The search shaft 14 and the leaf spring 15 are vertically slidable by a link mechanism 16 serving as a driving means. A slider 17 moves this link mechanism, and is operated by, for example, a solenoid. Examples of these driving means will be described in detail later.

Now, how to rotate the rotary table 4 will be explained next. In the conventional example shown in Fig. 1, the search axis 14
In other words, it became the drive shaft. In the present invention, search axis 1
4 is unrelated to the drive of the rotary table 4. A gear shaft 18 made of a dielectric material is provided as a drive shaft. Then, the belt 2 is
Driving force is transmitted via the pulley 21 and the pulley 21. A projection row 22 that engages with the gear shaft 18 is provided at the center of the lower surface of the rotary table 4. This figure (Fig. 2) is the search axis 1.
4 is raised upwards and becomes the protruding position, indicating a state in which the weight of the object to be heated can be measured. In this state, the gear shaft 18 does not engage with the protrusion row 22 serving as the engagement means, and the rotary table 4 functions as a weighing plate. After the weight measurement is finished and before heating starts, the slider 17
is pulled in the direction of the arrow, and the link mechanism 16 moves downward. Then, the leaf spring 15 and the search shaft 14 also slide downward, the weight measurement is completed, the gear shaft 18 and the row of protrusions 22 are engaged, and the rotary table 4 comes to function as a so-called turntable.

Now, FIG. 7 is a functional block diagram illustrating the configuration of the present invention.

The driving means 16 moves the search shaft 14 to make it convex in the heating chamber during weight measurement, lifts the rotary table 4 and the object to be heated 1, and uses the load sensor 8 to
These weights are input to the control section 9.

The control unit 9 detects the weight of the object to be heated 1 based on the data input from the load sensor 8, and determines the power supply time to the heating means 2, etc.

When the search shaft 14 is moved from the heating chamber to the retracted position by the drive means 16, the control unit 9 starts energizing the motor 19, rotates the drive shaft 18, and
Rotate the turntable 4 fitted with the turntable 8. Then, power supply to the heating means 2 is started.

FIG. 8 is a flowchart showing the operating procedure of such functional blocks.

The control unit 9 first determines whether the mode is weight measurement mode (a). If it is determined that the mode is weight measurement mode, the search shaft 14 is lifted by the driving means 16 (b), and since the weight of the rotary table and the object to be heated is transmitted to the load sensor, the load sensor 8 is used. The weight is measured (c). If not in weighing mode, this step is skipped.

Then, it is checked whether heating has started (d). When the heating mode is activated, the driving means 16
Since the drive shaft 14 has been moved to the retracted position (e), the control unit 9 starts supplying power to the motor 19 (f).
Then, the drive shaft 18 starts to rotate, engages with the rotary table 4, and rotates the object to be heated 1. At the same time, power supply to the heating means 2 is started (g).

Next, the rotation mechanism around the search axis will be explained in more detail. FIG. 3 is a detailed view of the main parts when the present invention is applied to a rotating table using magnets (so-called magnetic turntable). The rotating table 4 is made of a dielectric material such as glass or ceramic. Then, it is placed on the drive stand 23. The drive stand 23 is provided with a roller 24 and a magnet 25, and the pulley 2 outside the heating chamber
It is magnetically coupled with a magnet 25 placed on top of the magnet 1. The pulley 21 is urged by a spring 27 so as to be pressed against the bottom wall of the heating chamber, and is rotated by power transmitted by the belt 20 through a roller 28 and a pulley shaft 29 having a through hole in the center.

This figure (FIG. 3) shows a state in which the search shaft 14 is in the downward position and is in the retracted position, and the turntable 4 is rotatable, that is, during cooking. When using this as a scale plate, the search shaft 14 is pushed upward to protrude into the heating chamber, and the slidable scale shaft 30 is lifted. 31 is a dielectric sleeve that allows smooth sliding and prevents sparks caused by microwaves. Now, when the scale shaft 30 slides upward, the rotary table support 32 lifts the rotary table 4. The turntable 4 then becomes a weighing plate.

Here, the end surface of the search shaft 14 on the inside of the heating chamber may be provided with a flange-shaped head similarly to the scale shaft 30. With such a configuration, when the drive base 23 is removed,
There are no holes on the bottom, making it easy to clean.

Now, the configuration of the rotary table has been described above, and next, the driving means for the search axis will be described.

FIG. 4 shows an example in which the opening/closing operation of the door body is used as a driving source. A lever 34 is connected to the arm 33 and moves the slider 17 (see FIG. 2). With this configuration, the link mechanism 16, that is, the search axis moves upward when the door is opened, and the rotary table can be used as a weighing pan. When the door is closed, it moves downward,
The object to be heated can be rotated as a rotating table.

FIG. 5 shows an example in which a solenoid is used as a driving source. A key 35 is provided on the operation panel as an input means for commanding weight measurement. The control unit 9 decodes this command and operates the solenoid 36. After the weight measurement is completed, the search shaft is pulled out of the refrigerator before heating starts (or at the time when heating starts).

In addition, as a configuration of the drive source, it is also possible to form the weight key 35 with a push button or a lever and directly move the slider 17, which is a movable piece, without the intervention of the control section 9. In this case, there is a method of locking the start button so that heating cannot be started unless the lever is returned to its original position before starting heating.
A configuration can be applied in which when the start button is pressed, the holding of the lever is automatically released and the slider 17 returns to the outside of the refrigerator.

FIG. 6 is a block diagram showing an example of the configuration of the control section. As the load sensor 8, for example, a strain gauge is used. This data is input to an A/D converter 37, replaced with digital data, and transmitted to a microcomputer (hereinafter referred to as "microcomputer") 38, which is a main control section. Microcomputer 38
deciphers such weight data, detects the weight of the object to be heated, and also deciphers various commands from the keyboard 39. Then, predetermined information is displayed on the display tube 40, power supply to the magnetron 2 is monitored via the relay driver 41, and operation of the solenoid 36 is controlled via the solenoid driver 42.

As explained above, according to the present invention, the weight of the object to be heated can be measured at the same time as it is placed in the heating chamber, there is no radio wave leakage, and the object to be heated can be placed stably during heating. A heating device that can reliably rotate this can be realized.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a conventional heating device, Fig. 2 is a schematic diagram of a heating device showing an embodiment of the present invention, and Fig. 3 is an enlarged sectional view of main parts showing another embodiment of the invention. , FIG. 4 and FIG. 5 are schematic diagrams showing still other embodiments, FIG. 6 is a control block diagram of the heating device according to the present invention, FIG. 7 is a functional block diagram showing the configuration of the present invention, and FIG. The figure is a flowchart showing the operating procedure of the same functional block. 4...Rotary table (mounting table), 8...Load sensor,
9... Control unit, 14... Search axis, 17... Slider (movable piece), 36... Solenoid.

Claims (1)

[Scope of Claims] 1. A heating chamber that accommodates an object to be heated, a door body that closes an opening of the heating chamber and is provided so as to be openable and closable, a heating means coupled to the heating chamber, and a heating chamber in which an object to be heated is placed. a rotary table to be placed, a search shaft that supports the rotary table and is movable in and out of the heating chamber, and an elastic body that supports the search shaft;
A load sensor fixed to the elastic body, a control unit that measures the weight of the object to be heated using the load sensor, a drive shaft that rotates the rotary table through which the search axis passes, and a mechanical connection between the drive shaft and the drive shaft. It consists of a connected motor and a drive means for driving the search shaft so that it can freely appear and retract, and the drive means moves the search shaft to a convex position toward the inside of the heating chamber, lifts and supports the rotating table, A load sensor inputs the weight of the object to be heated and the rotary table to the control section, and the control section detects the weight of the object to be heated based on this input, and at least power supply to the heating means is started. Immediately before, the driving means moves the search shaft toward the outside of the heating chamber to the retracted position, moves the rotary table downward, and engages the drive shaft and the rotary table to reduce the driving force of the motor. A heating device characterized in that the heating device is configured to transmit heat to the rotary table and rotate it. 2. A movable piece that responds to the opening/closing operation of the door body is provided as the driving means, and the movable piece is engaged with the search shaft, and when the door is open, the search shaft is in a convex position,
The heating device according to claim 1, wherein the heating device is configured to move to the retracted position when the door is closed. 3. A solenoid is provided as the drive means, and the control unit operates the solenoid to detect the weight of the object to be heated with the search axis in a convex position, and at least immediately before power supply to the heating means is started, The heating device according to claim 1, wherein the heating device is configured to control the solenoid to set the search axis to a retracted position.