JPH01179825A - Cooking device - Google Patents

Abstract

PURPOSE:To prevent an opened door from fitting against a face or a body of a user by a method wherein at first a state of opening door is informed when the door opening operation is started in a cooking unit such as a microwave oven and after informing it, a door opening device is driven. CONSTITUTION:A cooking unit is provided with a door opening motor 5 for releasing a door of a heating chamber, a buzzer for informing an opened door in case of opening the door and means for driving the motor 5 at the informing part. When the cooking is completed, a door opening key is touched, a control part may ring the buzzer for a specified period of time and the fact that the door is opened is displayed at a displaying unit for a specified period of time. As the motor 5 is operated, a cam 6 is rotated and a pin 7 pushes up a lever 8. In this way, when a hook 2 is lifted up, an engagement between the hook 2 and a hook receptacle 4 is disengaged, and then a door 1 is released by an elastic force of a spring. In this case, the control part stops the driving of the motor 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] <Industrial Application Field> The present invention relates to a cooking appliance in which a door of a heating chamber is electrically opened.

(Prior Art) Some cooking appliances, such as microwave ovens, include a touch-type door open key on the operation panel, and open the door of the heating chamber electrically in response to a user's touch operation on the key.

(Problem to be solved by the invention) However, such electric door opening may distract the user's attention, and the opened door may directly hit the user's face or body. .

This invention was made in view of the above circumstances,
The purpose is to provide a highly safe cooker that can prevent the opened door from hitting the user's face or body.

[Structure of the Invention] (Means for Solving the Problems) A door opening device for opening a door of a heating chamber, a means for notifying that the door has been opened during a door opening operation, and a means for driving the door opening device after this notification. A means to do so shall be provided.

(Function) When the door is opened, the system first notifies the user that the door has been opened.
After the notification, the door opening device is activated.

(Embodiment) The following is a drawing showing an embodiment of the present invention, which is rotatable. A downward rotational force is constantly applied to the hook 2 by a spring (not shown).

A door receiving plate 3 is provided on the side of the microwave oven body, and a hook insertion hole 3a is formed in the door receiving plate 3 at a position corresponding to the hook 2. A hook receiving member 4 is attached to the hook insertion hole 3a. This hook receiving member 4 has an opening 4a and an inclined surface 4b.

That is, when the door 1 is opened, the hook 2 enters the hook insertion hole 3a. The hook 2 that has entered rotates upward while sliding on the inclined surface 4b of the hook receiving member 4 and resisting the biasing force of the spring, and enters the opening 4a. The hook 2 that has entered engages with the hook receiving member 4, and the door 1
maintain the development of

A door opening motor 5, which is a door opening device, is provided below the hook receiving member 4, and a cam 6 is attached to the rotating shaft of the door opening motor 5.

The cam 6 has protrusions 6a, 6a for position detection on its circumferential surface. Further, a bin 7.7 is erected on the front surface of the cam 6.

A lever 8 is rotatably provided near the cam 6. Normally, this lever 8 is given an upward rotational force by a spring (not shown), but when the door 2 is closed and the hook 2 engages with the hook receiving member 4, the lever 8 is rotated downward by the hook 2. It can be pressed down. In addition, when the lever 8 is pressed down, it receives an action of pushing up the bin 7 due to the rotation of the cam 6, and the hook 2
It works to lift the.

A door switch 9 is provided near the lever 8.

This door switch 9 is turned on when the lever 8 is pushed down, and turned off when the lever 8 is in the upper position.

Further, a cam position detection switch 10 is provided near the cam 6, and the actuator of the switch 10 is in contact with the circumferential surface of the cam 6.

Figure 1 shows the control circuit.

20 is a commercial AC power supply, and one end of the primary coil 22a of a high voltage transformer 22 is connected to one end of the power supply 20 via a fuse 21 and a door switch 9. -Next coil 22
The other end of a is connected to the other end of the power source 20 via a relay contact 3'la.

A secondary coil 22b of the high voltage transformer 22 is connected between the anode and cathode of a magnetron 25 via a half-wave voltage doubler rectifier circuit including a high voltage capacitor 23 and a high voltage diode 24. The anode of the magnetron 25 is grounded, and the heater (cathode) is connected to the secondary coil 22c of the high voltage transformer 22.

Further, one end of the door opening motor 5 is connected to one end of the power supply 20 via the fuse 21 and the door switch 9, and the other end of the door opening motor 5 is connected to a relay contact 32a,
It is connected to the other end of the power supply 20 via 31a.

On the other hand, the power supply 20 has a fuse 21 and a high voltage transformer 26.
The control unit 30 is connected via.

The control unit 30 is composed of a microcomputer and its peripheral circuits, and performs overall control of the microwave oven.

Connected to the control section 30 are relays 31 and 32, a buzzer 33 serving as an alarm, an operation display section 34, and the switch 10.

The operation display unit 34 has a display 35, a numeric keypad 36, a start key 37, and a door open key 38, and each key is touch type.

Next, the operation in the above configuration will be explained.

Food is placed in the heating chamber and door 1 is closed. At this time,
The hook 2 engages with the hook receiving member 4, and the hook 2 pushes down the lever 8. As a result, the door switch 9
turns on.

Then, the desired cooking time is set using the numeric keypad 36 of the operation display section 34, and the start key 37 is touched.

Then, the control unit 30 energizes the relay 31.

When the relay 31 is energized, the contact 31a is turned on and the magnetron 25 operates in oscillation.

When the magnetron 25 oscillates, the heating chamber 61 High-frequency radio waves are supplied to the machine, and cooking begins.

During cooking, the control section 30 counts the elapsed time, and when the count value reaches the set cooking time, deenergizes the relay 31. When the relay 31 is deenergized, the contact 31a turns off,
The oscillation operation of the magnetron 25 stops. In other words, cooking is finished.

At the end of this cooking, when the user touches the door oven key 38 to take out the food, the control section 30 causes the buzzer 33 to sound for a certain period of time. Furthermore, the control unit 30 displays the fact that the door is opened on the display 35 for a certain period of time.

Here, the fixed time for the buzzer sound generation and display is as follows:
It is preferable to wait several seconds so as not to irritate the user.

When the buzzer sounds and the predetermined period of time for the display has elapsed, the control section 30 energizes the relay 32 to drive the door opening motor 5.

When the door opening motor 5 operates, the cam 6 rotates and the bin 7 pushes up the lever 8. When the hook 2 is lifted in this manner, the hook 2 and the hook receiving portion 4 are disengaged, and the door 1 is opened by the biasing force of a spring (not shown).

In this case, the control unit 30 detects the rotational position of the cam 6 based on the state of the switch 10, and deenergizes the relay 32 when the cam 6 has rotated half a rotation to stop driving the door opening motor 5.

In this way, when the door open key 38 is touched, the buzzer sound is generated and the display is displayed, and then the door 1 is opened, so that the user can be strongly aware in advance that the door 1 will be opened. , it is possible to sufficiently avoid the open door 1 from hitting the face or body.

Further, even if the door open key 38 is accidentally touched, the door 1 will not be opened suddenly, so it is safe.

Hereinafter, a modified example will be explained with reference to FIG. 4.

Here, the door opening motor 5 is of a DC drive type, and a rechargeable battery 40 is provided as a backup power source. The door opening motor 5 is connected to the control section 30 via the relay contact 32a, and the rechargeable battery 40 is connected to the control section 30.

That is, it is a touch operation of the door oven key 38, but it is different in that the rechargeable battery 40 is charged when the power source 20 is turned on, and the charging voltage is used as the drive voltage for the door opening motor 5 when the power source 2o is not turned on. ing.

Therefore, even in the event of a power outage, the door 1 can be electrically opened in the same manner as in normal use, resulting in excellent usability.

Since the door 1 can be electrically opened with the power plug unplugged from the outlet, it is safe to clean the inside of the heating chamber.

The door 1 can be freely opened and the inside of the heating chamber can be inspected even during the distribution stage at a retail store, etc., and the reliability of the product can be ensured.

Although a motor is used as the door opening device in each of the embodiments, a solenoid valve may also be used, and the same implementation is possible in that case as well. Furthermore, although a buzzer is used as the alarm, a voice synthesizer or the like may also be used.

[Effects of the Invention] As described above, according to the present invention, there is provided a door opening device for opening the door of a heating chamber, a means for notifying the effect of the door opening at the time of the door opening operation, and a means for notifying the door opening device after the notification. Since a driving means is provided, it is possible to provide a cooking appliance with excellent safety that can prevent the opened door from hitting the user's face or body.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the configuration of a control circuit in one embodiment of the present invention, FIG. 2 is a diagram showing the configuration of the door oven motor and its surrounding parts in the same embodiment, and FIG. 3 is a part of FIG. 2. FIG. 4 is a diagram showing the configuration of a control circuit in a modification of the same embodiment. 1... Door, 2... Hook, 4... Hook receiving member, 5... Door opening motor (door opening device)
, 30...control unit, 33...buzzer (alarm). Figure 2 Figure 3, tb Figure 4

Claims (1)

[Claims] A cooking appliance characterized by comprising a door opening device for opening a door of a heating chamber, means for notifying that the door is opened when the door is opened, and means for driving the door opening device after the notification.