JPS5930970B2 - Cooking device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooking appliance that performs cooking by blowing hot air generated by a hot air generating means into a cooking chamber through a nozzle.

With this type of cooker, various types of cooking such as oven cooking and grill cooking can be performed by selecting the position of the nozzle.
For example, it is also necessary to specify the temperature control mode.

Specifically, in the case of oven cooking, it is often required to be able to set the desired temperature using a temperature control knob, and in the case of grill cooking, it is often required to be able to cook at a fixed temperature. A distinction between the temperature control mode and the latter temperature control mode must be specified.

According to the prior art, in such a cooking device, for example, the position of the nozzle must be manually set by operating a lever according to oven cooking or grill cooking, and the distinction between the temperature control modes described above must be specified. was rather complicated.

The present invention has been made in view of the above points, and is designed to enable the above-mentioned nozzle setting and temperature control mode designation to be performed by the same simple operation.The present invention will be described below with reference to examples.

FIG. 1 shows an overview of an electric cooking device 10 according to this embodiment.

The cooking device 10 includes a cooking chamber 11, a digital numeric display 12, a control panel 13 on the main body side, and a door 14 which is pivotally attached to the main body side and opens and closes the opening of the cooking chamber 11.
At the bottom of 1 is a turntable 15 on which the food to be cooked is placed and rotated.
are arranged.

The cooking device 10 includes hot air generating means, details of which are shown in FIGS. 2 to 4.

A hot air generation duct 17 attached to the outer surface of the upper wall 16 of the cooking chamber 11 is connected to the outlet of the blower 18 at its inlet side, and communicates with an exhaust port 19 provided on the left side of the center of the earthen wall 16 of the cooking chamber at its outlet side. An electric heater 20 is housed between the inlet side and the outlet side.

The blower 18 is driven by a blower drive motor 22 via a belt 21, and its intake port faces into the cooking chamber at the center front of the upper wall 16 of the cooking chamber.
The hot air generation duct 1 sucks the air from the cooking room through the intake port.
At this time, the air blown out from the air outlet 19 is turned into hot air by the heater 20.

The nozzle 23 is arranged facing the exhaust hole 19 on the outlet side of the hot air duct 17, and is pivotally attached to a rotating shaft 24.

The rotating shaft 24 is rotatably supported by a bearing 25 fixed to the upper wall of the cooking chamber, so that the nozzle 23 is rotated by rotation of the rotating shaft 240, and the blowing direction of hot air can be changed.

The hot air blowing direction, that is, the direction of the nozzle 23, can be specified in three directions, the first direction is the nozzle position shown by the solid line in FIG. 4, that is, the direction of arrow A, and the second and third directions are The directions are the same arrow B direction and arrow C direction, respectively.

In the first direction, the hot air is directed toward the periphery of the turntable 150, so that the hot air directly hits the food placed on the turntable, resulting in so-called grill cooking. Since the turntable 15 rotates, each part of the surface of the food to be cooked is sequentially exposed to hot air, and the degree of grilling is weak.

In the second direction, the hot air is directed near the center of the turntable 15, so grill cooking is also performed in this case, but even though the turntable rotates 150 times, the hot air always hits the same part of the food. Therefore, the degree of grilling is strong.

In the third direction, the hot air is directed toward the side wall of the cooking chamber and does not directly hit the food (because the atmosphere in the cooking chamber becomes hot,
This is what is called oven cooking.

The settings of the nozzle 23 in each of the above directions are performed by a nozzle drive motor 27 equipped with a built-in reduction gear and mounted on the upper part of the cooking appliance housing.

That is, the nozzle drive cam 28 is pivotally attached to the motor, and the rotation of the cam causes the shaft 3 of the cam follower 29 to slide into contact with the cam.
0, and this movement also causes a rocking motion of the crank lever 31 connected to the cam follower 29, causing the rotation shaft 24 attached to the lever to rotate.

Therefore, by stopping the cam 28 and therefore the motor 2T at an appropriate position, the nozzle 23 can be set in any of the three directions mentioned above.

A switch cam 32 is fixed to the upper surface of the nozzle drive cam 28.

The cam has two rows of cam surfaces arranged concentrically,
Actuators 35, 36 of the first and second switches 33, 34 are in sliding contact with each cam surface, respectively.

First and second switches 33. 34 is turned on or off by the movement of each actuator, and the stop position of the nozzle drive motor 27 is determined by the state of each switch.

That is, these switches act as means for detecting the position of the nozzle 23.

5 and 6 show the relationships between the cam surfaces of the nozzle drive cam 28 and the switch cam 32, and the states of the first and second switches 33, 34 and the nozzle 23.

The cam surface of the nozzle drive cam 28 is provided with a valley portion 28a, a first peak portion 28b, and a second peak portion 28c higher than the first peak portion. First mountain portion 28b.

When in contact with the trough portion 28a and the second peak portion 28c, it is located in the first direction (arrow A), the second direction (arrow B), and the third direction (arrow C).

On the other hand, the switch cam 32 has two peaks 32a on the inner circumferential side.
.

32b and two peaks 32 on the outer circumferential side.
c, and a second cam surface having 32d.

Note that the portions other than the peaks of the first and second cam surfaces constitute valleys.

First and second switches 33. 34 are turned on when their actuators touch the peaks of the first and second cam surfaces, respectively, and the relationship between the state of these switches and each direction of the nozzle 23 is as follows.
In particular, as clearly shown in FIG. The states are off, onion, offion, and on, respectively.

FIG. 1 shows details of the control panel 13 (FIG. 1),
The panel is provided with numeric keys O to 9, function keys for grill high, oven, grill low, start, and clear, and a temperature setting knob 40.

The temperature setting knob 40 is rotatable and has a temperature scale of 100 to 200° C. along its rotation locus.

On the control panel 13, operate the number keys to input the timer time, set the temperature control knob 40 to the desired temperature scale, and operate the oven key and start key in sequence, the nozzle 23 will move in the third direction (arrow C). Oven cooking is performed for the timer time input based on the temperature set by the knob 40.

Father: Enter the timer time as above, and press the grill strong key, grill weak key, and start key in sequence.
The nozzle 23 moves in the second direction (arrow B) or in the first direction (arrow A).
), and grill cooking is performed for the input timer time based on a constant temperature of 250°C.

FIG. 8 shows an electrical circuit diagram of the cooking device 10.

The electric heater 20 housed in the hot air generating duct 17 described above is connected to the commercial power terminals 52 and 53 of 60H2 via the bidirectional thyristor 51.
turns on when a voltage is applied to its gate through the photocoupler 54.

The turntable drive motor 26 and the blower drive motor 22 are connected to a power terminal 52.5 via a first relay contact 55a.
3, and the nozzle drive motor 27 is connected to power terminals 52, 53 via a second relay contact 56a.

The first, second, and third transistors 57, 58, and 59 drive the photocoupler 54, the first relay coil 55b, and the second relay coil 56b, respectively, and turn on and off each of these transistors as a control means. Controlled by microprocessor 60.

The microprocessor 60 has various input/output terminals, and each output of its output terminals HE, FTM, and NM turns on the first, second, and third transistors 57, 58, and 59, respectively, and outputs the output terminal OB. drives the buzzer circuit 61.

The input terminal INT receives the output of a shaping circuit 62 that shapes and outputs a 60H2 pulse train from the waveform of the commercial power supply terminals 52 and 53, and the microprocessor 60 uses this input pulse as a reference time pulse to perform necessary time measurement processing operations. .

The previously described switch state signals of the first and second switches 33 and 340 are input to the input terminal 11 and the switch 2, respectively.

The respective outputs of the first comparator 63 and the second comparator 64 are input to the input terminals 3 and 4, respectively.

The first comparator 63 is a temperature detection section 66 including a thermistor 65.
The output voltages of the temperature variable setting unit 68 including the variable resistor 67 are compared, and an output is generated when the former is higher than the latter.

The thermistor 65 is arranged near the wall of the cooking chamber 11 to detect the atmospheric temperature of the cooking chamber, and the resistance value of the variable resistor 67 is set depending on the position of the temperature control knob 40 (FIG. 7). , so the temperature of the cooking chamber 11 is set to the knob 40.
When the temperature is higher than the temperature set by , a signal is input to terminal 3.

The second comparator 64 compares the respective output voltages of the temperature detecting section 66 and the temperature fixing setting section 69 consisting only of fixed resistors, and generates an output when the former is higher than the latter.
A signal is input to the terminal I4 when the temperature of the terminal I4 is greater than a fixed temperature (for example, 250° C.).

A display data signal is generated from the output terminal group OD, and a digit control signal is generated from the other output terminal group OG1, and these signals enter the digital numeric display 12, where a multi-digit numeric display is performed. Ru.

Furthermore, a keyboard drive signal is output from another output terminal OG2, and this signal enters each key on the control panel 13. Therefore, if a key is operated when the signal is generated, the drive signal becomes the key signal and is input. Enter terminal group IK.

The microprocessor 60 is composed of a one-chip semiconductor integrated circuit, and is mainly a ROM (read-only memory).
, RAM (random access memory), arithmetic unit, etc., and performs work according to the program written in the ROM.

FIG. 9 shows the part after the start of heating in such a program.

In addition, during such execution, various storage areas of the RAM are used, but the ones that appear in the following explanation are TIME, CO
8 and FLG.

Hereinafter, the control mode of the microprocessor 600 and the cooking device 1 will be described.
The operation of 0 will be explained.

In principle, all key operations other than the clear key on the control panel 13 are accepted by the microprocessor when the cooker is in standby mode.

In this standby state, the RAM is all cleared and the microprocessor is in its initial state.

In the above standby state, when a number key is operated, the number input is stored in the TIME area as a timer time, and when any of the grill high, oven, and grill low function keys are operated, the contents of the CO8 area are respectively stored. 10, 11, and 01 are stored, and the timer time entered above is displayed on the display 12.

The clear key operation clears all inputs from each of the above operations.

Next, when the start key is operated, the microprocessor 6
0 starts heating execution according to the program shown in FIG.

In step S1, which is the first step of the program, it is checked whether any cooking mode of high grill, oven, or low grill has been specified so far.

That is, the content of the CO8 area is checked, and if it is 00, it is assumed that there is no specification and the process returns to the standby state; otherwise, it is assumed that there is a specification and the process moves to step S2, and then S3. Proceed to step S4.

In step S2, the output of the output terminal FTM of the microprocessor is set, so that the blower drive motor 22 and turntable drive motor 26 are energized.

In step S3, the input signals to the input terminals II and I2 are stored in the accumulator ACC of the microprocessor.

That is, since the input signal pattern corresponds to the position of the nozzle 23, the contents of ACC are 01, 10, and 11 for the 11th, 2nd, and 3rd directional positions of the nozzle, respectively.

In step S4, it is checked whether the current position of the nozzle 23 corresponds to the specified cooking mode.

That is, the contents of the C08R area and ACC are compared, and if they match, the nozzle position is determined to be appropriate and the process is performed in S5. S
After going through each step of 6, the process goes to step S9, and then goes to step S7 as there is a mismatch. After each step of S8, the process moves to step S9.

In each step of S5 and S7, the output of the output terminal NM of the microprocessor is reset and set, respectively.
In each step of S8 and S8, 0 and 1 are written in the FLG area, respectively.

Therefore, only when the position of the nozzle 23 is inappropriate, the nozzle drive motor 27 is energized and the nozzle position is changed.

In step S9, it is checked whether or not the clear key has been operated on the control panel 13, and if so, step S1
If there is no step, move to the SIO step.

In step S10, it is checked whether the designated cooking mode is oven cooking.

That is, the content of the CO8 area is checked, and if it is 11, the process goes to step Sll as oven cooking, and if not, goes to step 812 as not oven cooking.

In step 811, the input signal at the input terminal 3 of the microprocessor is checked, and if the cooking chamber temperature is higher than the temperature set by the temperature setting knob 40, the process moves to step 814, and if it is not in step 5, the process moves to step 813.

In step S12, the input signal of input terminal 4 is similarly checked, and the cooking chamber temperature is determined to be the fixedly set temperature (250°C).
Step S14 if above, or step S13 if not.
Move to step.

In each step Sl:l and S14, the output of the output terminal HE of the microprocessor is set and reset, respectively.
Therefore, the electric heater 20 is energized when the cooking chamber temperature is lower than the predetermined temperature.

After the snap of 813 or S14, the program is 815~
Proceed through each step of S17.

In step S15, the contents of the TIME area are subtracted based on the reference time.

That is, during the heating operation, the S15 step is passed repeatedly on the order of milliseconds, and in this circulation process, the contents of the TIME area are counted down every second, for example.

In step S16, the contents of the TIME area are displayed on the display 12 as the remaining time of the timer.

In step S17, the content of the TIME area is checked, and if it is O, it is assumed that cooking is complete, and the process moves to step 819, and if it is not 0, the process moves to step S18.

In step 818, it is checked whether or not the nozzle 23 is moving.

That is, look at the contents of the FLG area, and if it is 1, it means that it is moving and return to step S3, and if it is 0, it means that it is in a stopped state and go back to step S3.
Return to step 9.

In step S19, the microprocessor output terminal HE,
Each output of FTM and NM is reset, and in the following step S20, full power is applied to the output terminal OB for a short period of time to drive the buzzer circuits 6 and 1 for that time, and then the system enters a standby state.

Therefore, if the position of the nozzle 23 does not correspond to the pre-designated cooking mode at the beginning of the start key operation, the program will start at 83. S4. S7. The nozzle 23 continues to move through the path including S8, and when it reaches an appropriate position, the nozzle drive motor 27 stops and the nozzle 23 moves to the directional position corresponding to the cooking mode, that is, the first, second, and Stop in any of three directions.

In addition, the temperature control mode is checked in step 810, and step S11
．． S13 or 812. During the circulation including each step of S14, energization of the electric heater 20 is controlled based on either the temperature set by the temperature control knob 40 or the fixed temperature, and hot air is supplied to the cooking chamber 11. .

Further, during the circulation including steps 815 to 817, the timer time is counted, and when the timer remaining time reaches 0, the electric heater 20, blower drive motor 22, turntable drive motor 26, and nozzle drive motor 27 are All energization is completely stopped, and the buzzer circuit 61 is activated to notify the end of cooking.

As is clear from the above description, according to the present invention, it is possible to set the direction and position of the nozzle that blows out hot air, and to specify the temperature control mode, that is, the hot air generation control mode, according to various cooking modes such as oven cooking and grill cooking. This can be done with a simple cooking mode selection operation, eliminating the need for manual lever operation for setting the nozzle position as in the past, improving the operability of the cooker.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a cooking device according to an embodiment of the present invention, FIG.
The figure is a cross-sectional view of FIG. 2, FIG. 5 is a schematic diagram of the main mechanism of the cooking device, and FIG. 6 is a waveform diagram explaining the operation of the main mechanism.
FIG. 1 is a front view of the control panel of the cooking device, FIG. 8 is an electric circuit diagram of the cooking device, and FIG. 9 is a program flow chart showing the control operation of the cooking device. 11... Hot air generation duct, 33, 34...
...Nozzle position detection tube 1, second switch, 27...
...Nozzle drive motor.

Claims (1)

[Claims] 1 A cooking chamber, a hot air generating means, a nozzle whose direction can be changed to direct the hot air generated by the means to a selected area of the cooking chamber, a detection means for detecting the position of the nozzle, and a drive for changing the direction of the nozzle. A nozzle driving means inputs and sets a plurality of cooking mode information, drives and controls the hot air generating means based on the set information, and drives the nozzle based on the detected force of the detecting means to perform the set cooking. A cooking appliance comprising a control means for driving and controlling the nozzle driving means so as to set the nozzle driving means in a direction according to the shape.