JPS638374B2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention has a heater that is moved up and down by a DC motor in a heating chamber, and the heater is moved between a position for oven cooking and microwave cooking and a position for grill cooking. Regarding a grill oven that can be used.

(b) Prior art When grilling is performed using a preprogrammed heating method (hereinafter referred to as automatic heating method) for automatically cooking food in a grill oven that has a heater that moves up and down with a DC motor,
After the microwave heating is finished, the heater is automatically lowered to the grill heating position, but conventionally, the heater stop position was ensured at a predetermined height. However, if the heater always stops at the same height position and heats the food, the height of the heated item will vary even for the same menu, and the difference in the distance between the heater and the heated item will cause a difference in the finish of the food. It will come out. In addition, even if the heating sequence is the same, if the height of the heated object is extremely different, as shown in Figure 1A and B, the height of the heater 3 can be determined according to the heated object (I). ), the heater 3 comes into contact with the object to be heated. If so, the heater 3 will be too far away.
Therefore, it is either impossible to cook the heated items A and B with the same automatic heating method, or the user has to memorize the optimal stop position of the heater in advance in the LSI memory element in the control board, that is, the heater must be turned off once before heating. I had to lower it and use the memory button to memorize the optimal stopping position.

<Object of the Invention> The present invention solves the above-mentioned drawbacks of the prior art, and allows the height of the heater to be freely changed according to the height of the object to be heated, thereby heating the object at the optimum position. The purpose is to provide grill oven ranges.

<Structure of the Invention> The present invention has a heater that moves up and down in the heating chamber, and this heater is automatically moved between a position for oven cooking and microwave cooking and a position for grill cooking. In a grill oven range, a height detecting means for measuring the height position of an object to be heated, a means for calculating a required lowering amount of the heater from a value measured by the detecting means, and a height detecting means for calculating a required lowering amount of the heater based on the value calculated by the calculating means. This grill oven range is characterized by having a drive means for lowering the amount by a required amount.

<Example> Fig. 2 is a perspective view of a grill oven range showing an example. Inside the oven 1, there is a heater 3 rotatably mounted around a through hole 2 provided in the left and right side walls 12 of the oven. The heater 3 is rotatably movable between a position directly above the tray 5 for grill cooking and a position facing the convection fan 4 on the rear wall of the oven. An optical height sensor 40 is provided on the top of the oven to measure the height of the object to be heated. On the operation panel 6, a heater up button 7, a heater down button 8, a grill selection button 9, a grill auto button 10, a memory button 11, etc. are provided.

3 to 5 show mechanisms for driving the heater and detecting the heater position.

The heater 3 protrudes from a hole 2 in a side wall 12 of the oven 1 to the outside, and its end 13 is bent at right angles to the rotation axis. There is a heater yoke 14 and a yoke insulator 15 in the hole 2, which function to prevent radio wave leakage, insulate the heater 3, and serve as a bearing plate for the heater 3. The heater drive gear 17 has a bent portion 17-1 that passes through the end portion 13 of the heater 3 to apply rotational torque to the heater 3, and is provided with a select gear 17-2 that receives rotation from the motor 18. ing. The heater drive gear 17 includes a signal slit plate 3 that rotates coaxially with the gear 17.
0 is positioned and fixed by pin 17-3. A plurality of slits 31 are provided at regular intervals on the same radius in the signal slit plate 30, and a photointerrupter 3 is provided opposite to the slits 31.
2 is provided. The rotation of the DC motor 18 is transmitted to the wall foil 24 via a small pulley 19, a belt 20, a large pulley 21, and a worm 22.
Furthermore, it is transmitted to the heater drive gear 17 via a clutch gear 25 fitted into the boss of the wall foil 24 so as to be slidable in the thrust direction. As a result, when the DC motor 18 is rotated, its rotation is decelerated, and at the same time as the heater 3 is rotated, the signal slit plate 30 also rotates together with the heater drive gear 17, so that the slit 31 provided on the signal slit plate 30 is rotated. It passes through the interrupters 32 one after another. Since the output voltage of the photo interrupter 32 is zero if there is an obstacle between them, the output signal aV is generated only when the slit 31 of the signal slit plate 30 passes between the photo interrupters 32.
It outputs the same number of pulse signals as the number of passes through the slit 31. Figure 4 shows the state in which the heater 3 has been lowered to the position for grill cooking, and
The figure shows the heater 3 rotated to the position for oven cooking and microwave cooking.

FIG. 6 is a schematic diagram showing the structure of the optical height sensor 40. Light emitted from a sensor lamp 41 passes through a condenser lens 42, is refracted by a half mirror 43 by 90 degrees, and is irradiated onto the object to be heated by an objective lens 44. The reflected light from the object to be heated passes through the objective lens 42 again and enters the phototransistor 45. When the object to be heated is close to the sensor 40, the irradiation area is wide, the amount of reflected light hitting the phototransistor 45 increases, and the output voltage increases. On the other hand, if it is far away, the irradiation area will be small and the amount of reflected light will be small.
The output voltage will be lower. Therefore, by measuring the output voltage of the phototransistor 45, the distance from the optical height sensor 40 to the object to be heated can be measured, and from the measured value, the required drop amount of the heater 3 can be calculated, and the distance to the object to be heated can be calculated. The optimum heating position of the heater 3 can be determined. Therefore, by associating the calculated required amount of descent with the number of passages of the photointerrupter 32 of the slit 31 in advance, the required amount of descent of the heater 3 can be quantified, and the same number of pulse signals as that value can be generated. By lowering the heater 3 until it is emitted from the photo interrupter 32, the heater 3 can be lowered to a predetermined position.

FIG. 7 is a block circuit diagram of the control mechanism of the present invention, and FIG. 8 is an operational flowchart. 7th
The control operation will be further explained with reference to FIGS. When the automatic grill key is selected using the control key, the sensor lamp 41 in the optical height sensor 40 lights up in response to a signal from the CPU in the operation panel 6. The light emitted from the sensor lamp 41 hits the object to be heated, and the reflected light enters the phototransistor 45, which outputs a voltage. After this output is converted to a digital signal via an AD converter,
The voltage is measured by the CPU, the distance to the object to be heated is calculated from the voltage, and the required drop amount of the heater 3 is calculated from this calculated distance in terms of the number of pulses. This number of pulses is calculated as 10, for example, if the number of slits 31 that cross the photo interrupter 32 is 10 when lowering the heater 3 by the required amount of descent. Next, voltage is input to the photo interrupter 32 by a signal from the CPU,
Photo interrupter 32 emits light. continue
A signal from the CPU causes the motor rotation direction switching relay to raise the heater 3 (state A). As a result, the heater 3 is moved to a position for oven cooking and microwave cooking, and is stopped at a stopper 33 (see FIG. 5). When the slit 31 no longer passes through the photo interrupter 32 due to the stoppage, and the pulse signal is no longer output,
The CPU determines that the heater 3 position has reached the position, resets the pulse counter in the CPU,
Set the motor rotation direction switching relay to a state in which the heater 3 is lowered (state C). As a result, the motor 18 rotates, the heater 3 descends, and the slit 31 passes through the photo interrupter 32.
The pulse signal from the photo interrupter 32 is
Enter the CPU. The CPU counts the number of times of this pulse signal and compares it with the number of pulses calculated from the optical height sensor 40. and when they are the same
A signal from the CPU changes the state of the motor rotation direction switching relay to the motor 18 stop state (state B), and the heater 3 stops.

<Effects of the Invention> According to the present invention, the height of the heated object inserted into the oven is automatically measured, and the optimal position of the motor is automatically determined from the measured value. Since the heater can be moved to the desired position, the object to be heated can be heated at the optimal heater position adjusted to accommodate variations in the heights of the objects of the same type. Therefore, there is no variation in the finished product, and good cooking can always be ensured. Moreover, no matter what height the object to be heated is loaded, there will be no inconvenience such as the heater directly touching the object to be heated. Also, even if the cooking sequence is the same, there are cases where the same menu cannot be created due to differences in the height of the items to be heated.
Now you can do it with one key menu.

[Brief explanation of the drawing]

1A and 1B are schematic diagrams showing states of heater heating according to the prior art, FIG. 2 is a perspective view of a grill oven range showing an embodiment of the present invention, and FIG. 3 is a sectional view of the heater drive mechanism. Figures 4 and 5 are front views showing the heater position detection mechanism, Figure 6 is a schematic diagram of the optical height sensor, Figure 7 is a block diagram of the control mechanism of the embodiment, and Figure 8 is the operation of the embodiment. It is a flowchart. 3... Heater, 17... Heater drive gear, 30
... Signal slit plate, 31 ... Slit, 32
...Photo interrupter, 40...Optical height sensor.

Claims (1)

[Claims] 1. A grill that has a heater that moves up and down in a heating chamber, and that automatically moves this heater between a position for oven cooking and microwave cooking and a position for grill cooking. In the microwave oven, a height detecting means for measuring the height position of an object to be heated, a means for calculating a required fall amount of the heater from a value measured by the detecting means, and a means for controlling the heater based on the value calculated by the calculating means. A grill oven range characterized by having a drive means for lowering the grill by a required amount. 2. The grill oven according to claim 1, which has means for comparing the calculated required amount of descent of the heater with the actual amount of descent of the heater, and stops the descent of the heater at the point where the comparison value becomes zero. range.