JPS63153329A - Heating device - Google Patents

Abstract

PURPOSE:To alert an erroneous operation and prevent such a failure by determining whether a position suitable for the selected heating command key is set by detecting the distance to the food-stuff to be cooked or cooking tray by means of a distance measuring sensor, and causing a control section to determine the cooking tray position based on the detected distance data. CONSTITUTION:The heating command signal inputted by means of a heating command key 4 is interpreted in a control section 5. The control section 5 measures the distance to the cooking tray 8 on which a food-stuff 7 is placed by means of a distance measuring sensor 6. Shelf rails 10 are arranged in multiple hight levels on the opposing side walls of the heating chamber 9, and a position suitable for the food-stuff is selected. The detected distance D is smallest when the cooking tray 8 is on the top level, and becomes greater as the position is lowered. That is, by measuring the distance D, the cooking tray position can be determined. Based on this determination of the shelf position selected, a determination is made as to whether it is suitable for the selected heating command key. If the determination results detect that there was an inputting error, the control section 5 alerts such by means of a warning device 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to a heating device that can detect an error using a distance sensor and issue an alarm when the shelf position of a heating device is erroneously manipulated. Regarding equipment.

Conventional technology Heating devices that raise the ambient temperature in the heating chamber and cook the object by convection heating, such as electric ovens and gas ovens, have different baking temperatures, cooking times, and placement settings for each type of object. Because the shelf position of the dishes etc. is different,
Generally, separate keys are provided on the operation panel for each type or category of the object to be heated. In other words, for oven dishes such as kutskies, cakes, shakes, and butter rolls, the user of the heating device presses different keys on the operation panel to select the desired baking temperature and heating time, and then places the trays on the designated shelves. and start cooking.

In addition to the temperature and time, the position of the mounting plate must also be selected because the temperature distribution within the heating chamber naturally changes slightly in the height direction, and it depends on the type of object to be heated. This is because there is an optimal vertical balance.

Problems to be Solved by the Invention For this reason, the user of the heating device must select the desired key from among the many keys on the operation panel and select the appropriate shelf position according to the type of object to be heated. If it was placed in the wrong position, the heat balance would be disrupted and you would not be able to cook properly.

The user does not realize that they have placed the shelf in the wrong position until the cooking is finished, that is, until the cooking ends in failure.
I often ended up wasting valuable materials.

As mentioned above, in the conventional heating device that uses convection heating for oven cooking, it is necessary to press different keys depending on the type of object to be heated, such as cookies or cakes, and to set the tray correctly on the predetermined shelf position. In addition, it was unclear whether or not the device was set correctly, and the user had to spend an anxious time until the cooking was completed.

In view of this background, the present invention is a heating device that, when a heating command key is pressed, detects whether or not a mounting plate is set at a position appropriate for the object to be heated that belongs to that key, and can issue an alarm if there is an erroneous operation. 6 Means for Solving the Problems In order to solve the above problems, the present invention provides a distance measuring sensor to detect the distance to the object to be heated or the mounting plate. . A plurality of heating command keys for selecting the type or category of the object to be heated are arranged on the operation panel. Further, an alarm means is provided to notify of incorrect insertion of the mounting plate.

Function: In the heating device of the present invention, the distance sensor detects the distance to the object to be heated or the distance to the mounting plate, and the control unit determines the position of the mounting plate based on which distance data. , determine whether the selected heating command key is set in an appropriate position. If there is an erroneous operation, the alarm means is used to notify this.

EXAMPLE Hereinafter, a heating device according to an example of the present invention will be explained with reference to the drawings.

FIG. 2 is a perspective view of the main body of the heating device according to the present invention.

A door body 2 is pivotally supported on the front surface of the main body 1 so as to be freely openable and closable, and an operation panel 3 is provided. A plurality of heating command keys 4 are arranged on this operation panel.

FIG. 1 is a block diagram showing the configuration of such a heating device. The heating command input from the heating command key 4 is sent to the control unit 5.
deciphered by The control unit 5 then controls the distance measurement sensor 6
Measure the distance to the mounting plate 8 on which the object to be heated 7 is mounted.

A pair of shelf rails 1 are installed on opposite side walls of the heating chamber 9.
A plurality of shelves are provided, and an appropriate shelf position is selected depending on the object to be heated. For example, Kutsky is on the top row,
Shade and butter rolls are placed on the middle shelf, cake cakes are placed on the bottom shelf, and so on. Which shelf position is appropriate is determined mainly by the design of the heating chamber, and the optimal shelf position is determined by heat distribution to the upper and lower heaters, overall heat balance, material distribution of the dough, etc.

Now, when the mounting plate 8 is placed on the upper stage, the detection distance is the smallest, and the distance increases as the tray 8 is placed in the middle and lower stages. In other words, by detecting the distance 1111D, the position of the mounting plate can be determined.

The placing tray 8 is a rectangular metal part as shown in the perspective view of FIG. 3, and the flange portion of the periphery rests on the shelf rail. The entire surface is treated with enamel or other surface treatments to increase corrosion resistance.

Returning to FIG. 1, with the above configuration, the control unit 5 can detect the position of the placement tray 8 using the distance measurement sensor 6, and based on this determination, the selected placement is 1, It is determined whether the selected heating command key is appropriate.

And if this judgment result is 1. If an operational error is detected, the control unit 5 uses the alarm means 11 to notify the user of this error. The alarm means 11 may be a buzzer, a voice synthesis circuit, or other device that emits an alarm sound, a device that displays a warning, or a combination thereof.

12 is a display section, and FIG. 4 shows an embodiment using this display section as an alarm means.

The display section 12 includes a time display section 13, a temperature display section 14, a menu name display section 15, and a shelf position display section 16.

When a heating command key is pressed, one of the corresponding menu name display sections lights up and at the same time the correct shelf position is displayed. If you set the tray incorrectly, this shelf position display will flash to warn you.

With this configuration, there is no need to add a new buzzer or the like as a warning means, and the correct shelf position to be set can be displayed, so the operability is very good.

After determining the shelf position as described above, the control unit 5 starts supplying power to the heating means 18 via the driver 17. If there is an incorrect operation of the mounting plate, power supply to the heating means will not start.

In this embodiment, the heating means 17 is a planar electric heater arranged vertically outside the heating chamber, but it may also be an electric open type with hot air circulation, or of course a gas oven equipped with a gas burner. It goes without saying that the present invention can also be applied to.

Now, the control unit 5 sets the heating temperature corresponding to the input menu, and controls the power supply to the upper and lower heaters while monitoring the temperature inside the heating chamber with the temperature sensor 19. Power distribution up and down and heating time can also be changed according to the menu.

Reference numeral 20 indicates a distance measurement sensor detection circuit, and 21 indicates a temperature sensor detection circuit. As the temperature sensor detection circuit 21, A
An A/D converter or the like is used, but if the control section 5 is configured with a microcomputer or the like, one with a built-in A/D circuit can be used.

Next, an example of the configuration of the distance measuring sensor 6 and its detection circuit 20 will be described. FIG. 5 shows an ultrasonic sensor as an example of a distance measuring sensor.

The ultrasonic sensor includes a piezoelectric element 22, a conical resonator 24 that engages with the piezoelectric element 22 via a coupling shaft 23, and a lead wire 2.
5, a terminal 26 coupled to the piezoelectric element 22, a terminal plate 27 that fixes the terminal 26, and a case 2 forming an outer shell.
8, a beam shaping plate 29 that covers the opening of the case 28 on the side of the conical resonator 24, and a sound absorbing sheet 30 provided on the inner surface of the terminal plate 27. (Nashinaru Technical Revo-) P, 504-514 Vol.

29 No. 3 1983) As the distance measuring sensor 6, other optical sensors such as infrared sensors and photocouplers can also be used. Next, FIG. 6 is a block diagram showing an example of the configuration of the detection circuit 20 of the ultrasonic sensor.

The control unit 5 is composed of a microcomputer or the like, and by performing timing control, one ultrasonic sensor transmits an ultrasonic wave of several tens of kHz, and when receiving it, it is switched to a transfer device and operates.

31 is a transmitting circuit, and 32 is a receiving circuit. Comparison circuit 33
compares the reference voltage and the received signal, latches the received signal exceeding this reference voltage, and inputs it to the control section 5. The control unit 5 counts the time from transmitting the ultrasonic wave until receiving it, calculates the distance from the propagation velocity of the ultrasonic wave to the placing plate or the heated object, and calculates the position of the placing plate and the heated object from this. Detect the height of an object.

With the above configuration, the position of the mounting plate and the height of the object to be heated can be detected, and if the mounting plate is set at a shelf position that is inappropriate for the selected heating command key, this will be detected and an alarm will be issued. can be emitted. .

Note that the present invention is also applicable to a so-called oven microwave oven that combines a microwave oven and an electric or gas open oven. Regarding the open heating method, in this embodiment, only a temperature sensor is provided, but it is of course also possible to use a humidity sensor or the like in combination to detect the completion of the food.

Effects of the Invention As described above, the heating device of the present invention includes a distance measuring sensor,
This allows the position of the mounting plate and the height of the object to be heated to be detected, and it is possible to determine whether the mounting plate has been inserted into the correct shelf position based on the selected heating command key. If detected, an alarm can be issued.

Therefore, the user of the heating device does not have to worry about noticing the erroneous operation of the shelf position due to a cooking failure after the heating is finished, as in the conventional case. It would be even more effective if the configuration was configured to prohibit the start of heating if the mounting plate is incorrectly inserted.

As described above, according to the present invention, a shelf position can be selected without error, and a heating device that can be operated safely can be realized.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of a heating device according to an embodiment of the present invention, Fig. 2 is a perspective view of the main body, Fig. 3 is a perspective view of the mounting tray, and Fig. 4 is a front view of the display section. 5 is a sectional view of an ultrasonic sensor as an example of a distance measuring sensor, and FIG. 6 is a circuit block diagram showing an example of the configuration of a detection circuit of the ultrasonic sensor. 4--Heating command key, 5--, control unit, 6-- Distance sensor, 7--Object to be heated, 8-- Placement plate, 9--
- Heating chamber, 10...-Shelf rail, 11... Alarm means, 18... Heating means. Name of agent: Patent attorney Toshio Nakao (1 person) No. 10, No. 20, Fig. 3, Fig. 4

Claims (1)

[Claims] A heating chamber for storing an object to be heated, a heating means provided in the heating chamber, a control section for controlling power supply to the heating means, and a plurality of heating command keys for selecting heating of a desired object to be heated. , consisting of a placing plate on which the object to be heated is placed, a distance sensor for detecting distance, and an alarm means, the placing plate is positioned at a predetermined height within the heating chamber, and the control unit By detecting the distance from the distance measuring sensor to the object to be heated or the placing plate using the distance measuring sensor, the position of the placing plate in the heating chamber is determined, and the position of the placing plate is If the heating device is not detected at a position determined by selection of a heating command key, the heating device is configured to notify by the alarm means.