JPS61119928A - Cooker - Google Patents

Abstract

PURPOSE:To prohibit the free control of proceeding of cooking under the condition that a mechanical lock switch is not turned ON on some trouble by a method wherein the turning-ON of the mechanical lock switch within a certain period of time since a control starting switch is turned ON is monitored and the energizing control to a heating action part is started only when the occurrence of the turning-ON of the mechanical lock switch within a certain period of time is detected. CONSTITUTION:When a cooking starting key 2 is actuated by being depressed under the state that a door is closed, a control starting switch 7 is turned ON. At that time, a microcomputer 35 monitors whether a mechanical lock switch signal Vc is supplied to itself within a certain period of time or not. when a mechanical lock switch 5 and its neighboring mechanism are in good order, the switch 5 is also turned ON, resulting in supplying the signal Vc to a main control part 31 or, after being converted into a pulse signal at a photocoupler 36, to the computer 35. Thus, the computer 35 detects the turning-ON of the switch 5 and starts the control of proceeding of cooking, when the occurrence of said turning-ON lies within a certain period of time.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention provides a cooking method that is turned on by operating the cooking start key only when the door of the b-mouth heated seedling is closed, and that is turned on in conjunction with the opening of the door. The present invention relates to a cooking appliance in which a mechanical lock switch that is released is provided in an energizing path to a heating operation section.

[Technical background of the invention]

Generally, some cooking appliances, such as microwave ovens, are equipped with a microcomputer and electronically control cooking according to cooking conditions input from a keyboard of an operation section. By the way, in such a microwave oven, the microcomputer may malfunction due to external noise and start cooking unnecessarily.

To deal with this situation, we have installed a mechanical lock switch in the heating operation part that is turned on by operating the cooking start key only when the door of the heating chamber is closed, and released from the on state when the door is opened. A control start switch is provided in the energized path and is turned on when the cooking start key is operated to start controlling the cooking execution by the microcomputer, so that cooking will not be performed unless the dual cooking start conditions are satisfied. There is something.

Examples of the mechanical lock switch and control start switch are shown in FIGS. 4 and 5. Reference numeral 1 denotes an operation panel provided on the front surface of the main body of the microwave oven, and a cooking start key 2 is provided at a predetermined location on the operation panel 1. This cooking start key 2 has a lever part 2a that passes through the operation panel 1 and is introduced into the microwave oven main body.

A bushing lever 3 is disposed near the lever portion 2a. At the upper end of the bushing lever 3 is a slider 4.
The slider 4 is in contact with the actuator 5a of the mechanical lock switch 5. The slider 4 is
When the heating chamber opening door is closed, it is allowed to move downward, but when the door is opened, it moves upward. Further, a burial circuit board 6 is provided facing away from the operation panel 1, and a separate start switch 7 is provided on the control circuit board 6 at a position corresponding to the tip of the lever portion 2a.

That is, when the opening door of the heating chamber is closed, the slider 4 is allowed to move downward, so when the cooking start key 2 is pressed, the bushing lever 3 rotates, the slider 4 descends, and the mechanical lock switch 5 is activated. is now turned on. At the same time, the tip of the lever part 2a comes into contact with the actuator 7a of the control start switch 7, so that the control start switch 7 is turned on. In this case, when the pressing operation of the cooking start key 2 is released,
The cooking start key 2 is returned to its original position by the biasing force of a spring (not shown), and the control start switch 7 is accordingly turned off, but the mechanical lock switch 5 remains on because the slider 4 remains lowered. Then, when the door of the heating chamber is opened, the slider 4 moves upward, and the on state of the mechanical lock switch 5 is released.

[Problems with background technology]

However, in such a microwave oven, a failure may occur in the mechanical lock switch 5 or the photographing system in the vicinity thereof, and the mechanical lock switch may not be turned on regardless of the pressing operation of the cooking start key 2. In this case, since the mechanical lock switch 5 is not turned on, the heating operation part does not operate, but the control start switch 7 is turned on, so the microcombi 1-1 has previously started controlling the execution of cooking, giving the user a feeling of distrust. It makes me embrace.

(Object of the invention) This invention was made in view of the above circumstances.
The purpose is to provide a highly reliable cooking appliance that can eliminate the problem of starting cooking execution control even if the mechanical lock switch is not turned on due to a failure.

(Summary of the Invention) This invention is provided in a cooking start key and an energizing path to a heating operation section, and is turned on by operating the cooking start key only when the door of the heating chamber is closed, and the door is turned on when the door of the heating chamber is closed. A mechanical lock switch that is released from an on state in conjunction with opening, a control start switch that is turned on by operating the cooking start key, and whether or not the mechanical lock switch is turned on within a certain period of time after the control start switch is turned on. The heating device is provided with a monitoring means for monitoring the heating operation, and a control means for starting energization control to the heating operation section only when the monitoring means detects that the mechanical lock switch is turned on within a certain period of time.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 2, 10 is a commercial AC power supply, and this power supply 10
A primary coil 13a of a high voltage transformer 13 is connected to the fuse 11, door switch 12, mechanical lock switch 5, relay contacts 32a, 33a1, and magnetron thermal 14 in series. The secondary coil 13b of the high voltage transformer 13 has a high voltage capacitor 15. The anode and cathode of the magnetron 18 are connected through a voltage doubler rectifier circuit consisting of a high voltage diode 16° and a discharge resistor 17. And the magnetron 18 heater (
The cathode) is connected to the secondary coil 130 of the high voltage transformer 13, and the anode is grounded. In other words, it is a high voltage transformer 131 times voltage rectifier circuit.

A heating operation section is constituted by the magnetron 18 and the like. Note that 19 is a door monitor switch, 20 is a Shonai light for illuminating the heating room, 22 is a rotating shelf drive motor that drives a rotating shelf for placing food, and 23 is a blower motor for cooling the magnetron.

Further, a primary coil of a transformer 30 is connected to the power source 1 via the fuse 11 and the magnetron thermal 14 in series, and a main control section 31 is connected to the secondary coil of the transformer 30.

This main control section 31 is made up of a microcomputer and its peripheral circuits, and relays 32, 33 and an operation section 34 are connected to the outside.

This operating section 34 has the configuration shown in FIGS. 4 and 5. Thus, the AC power supply voltage Vc (hereinafter referred to as a mechanical lock switch signal) obtained via the mechanical lock switch 5 is supplied to the main control section 31.

Here, main parts of the main control section 31 are shown in FIG.

That is, the main control section 31 has a microcomputer 35 and a photocoupler 36, and the photocoupler 36 converts the voltage change of the mechanical lock switch signal VC into a pulse signal and supplies the pulse signal to the microcomputer 35. There is.

Although not shown, an output signal from the control start switch 7 in the operation section 34 (hereinafter referred to as a control start switch signal) is also supplied to the microcomputer 35.

Next, the operation of the above configuration will be explained with reference to the flowchart of FIG.

Now, the food to be cooked is placed in the heating chamber, the door is closed, and cooking conditions are inputted using keys on the operating section 34, and the cooking start key 2 is pressed.

Then, the control start switch 7 is turned on. When the control start switch 7 is turned on, the microcomputer 3
5 operates an internal 10Q 1sec counter to monitor whether or not the mechanical lock switch signal Vc is supplied within a certain period of time, for example, 2Q Q m5ec.

If there is no failure in the mechanical lock switch 5 and its peripheral mechanisms, the heating chamber door is closed, so the mechanical lock switch 5 is also turned on. When the mechanical lock switch 5 is turned on, the mechanical lock switch signal Vc of AC power supply voltage 100V
is supplied to the main control section 31 , and the mechanical lock switch signal Vc is converted into a pulse signal by the photocoupler 36 and supplied to the microcomputer 35 . The microcomputer 35 senses that the mechanical lock switch 5 has been turned on by being supplied with the mechanical lock switch signal Vc, and starts controlling the execution of cooking if the turning on is within 200 m5ec from the turning on of the control start switch 7. That is, the operation of the magnetron 18 is controlled by controlling the relays 32 and 33 according to cooking conditions input in advance. On the other hand, 20 seconds have passed since the control start switch 7 was turned on.
If the mechanical lock switch 5 is not turned on within 0 m5ec, the microcomputer 35 prohibits cooking execution control.

Note that when the door of the heating chamber is opened during cooking, the on state of the mechanical lock switch 5 is released and the magnetron 18 is turned off.
Electricity is cut off and cooking stops.

In this way, since the cooking execution control is started only when the control start switch 7 and the mechanical lock switch 5 are both turned on, when the mechanical lock switch 5 is not turned on due to a failure, the microcomputer 35 is configured to start the cooking execution control. It is possible to eliminate problems such as starting.

In addition, the mechanical lock switch signal Us is 200m5ec.
Since the mechanical lock switch 5 is operated continuously for a time of Not at all.

In the above embodiment, the mechanical lock switch signal is continuously monitored for 200 m5ec, but this time may be set as appropriate depending on the structure of the mechanical lock mechanism. In addition, the present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without changing the gist.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide a highly reliable cooker that can eliminate the problem of starting cooking execution control when the mechanical lock switch fails to turn on due to a failure. .

[Brief explanation of the drawing]

FIG. 1 is a flowchart for explaining the operation of an embodiment of the present invention, FIG. 2 is a configuration diagram of the III'm circuit of the embodiment, and FIG. 3 is a diagram showing the main parts of the main control section of the embodiment. The configuration diagrams, FIGS. 4 and 5, are configuration diagrams showing a mechanical lock switch, a control start switch, and the mechanisms surrounding the same. 2...Cooking start switch, 5...Mechanical lock switch, 7...Control-start switch, 35...Microcomputer. Applicant's agent Patent attorney Takehiko Suzue ll? J1 diagram

Claims (1)

[Claims] A cooking start key is provided in the energizing path to the heating operation section, and is turned on by operating the cooking start key only when the door of the heating chamber is closed, and is released from the on state in conjunction with the opening of the door. a control start switch that is turned on by operation of the cooking start key; a monitoring means that monitors whether or not the mechanical lock switch is turned on within a certain period of time after the control start switch is turned on; A cooking appliance characterized by comprising: a control means that starts controlling the energization of the heating operation section only when the monitoring means detects that a mechanical lock switch is turned on within a certain period of time.