JPH0350419A - Heating and cooking device - Google Patents

Abstract

PURPOSE:To prevent an abnormal heating from being generated by a method wherein in the case that an electrical energization for a heater is continued over the longest scale time in a manual timer, a timer means in a control device counts an electrical energization limit time, and then a heating power control means for a controller device stops a relay. CONSTITUTION:A solenoid 21 of a manual timer 9 is controlled by a control device 41 composed of a micro-computer. The control device 41 has at least a timer means 42, a timer driving mode control means 43 and a combustion power control means 44. A cooking time is set in the timer means 42 through a manual timer 9 and a time set in this means is measured by counting the number of pulses got through an oscillation circuit 45 connected to the control device 41 with a counter. A combustion power control means 44 is connected to the time means 42. The control means 44 is set with an electrical energization limiting time longer than the longest scale time by several minutes, for example. As an elapsing of the limiting time is counted by the timer means 42, the combustion power control means 44 stops the relay.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a heating cooker such as a toaster oven.

[Prior Art] A technology for controlling the drive speed for rewinding the operating shaft of a manual timer that sets the energization time to the heater using multiple drive modes possessed by a microcomputer was disclosed in Japanese Patent Laid-Open No. 6
It is known from the publication No. 3-318036. This technology is
By controlling the excitation speed of the solenoid of the drive means that rotates the operating shaft in the direction opposite to the winding direction of the operating shaft using a microcomputer, the drive speed of the drive means can be adjusted in stages according to the winding angle of the operating shaft. The drive speed of the frequently used short time period is set faster, and the scale of this short time period is made larger than that of other long time periods, thereby improving the accuracy of time setting work. be.

[Problem to be solved by the invention] By the way, in a structure using a microcomputer, once a manual timer is used: J! After setting the J-time,
The timer control will not be cleared until this time has elapsed. Therefore, for example, after the cooking special is already set,
During this control, if the cooking time is set twice using the manual timer again, these times will be added as a result. As a result, the i! heater is powered on for a long time beyond the cooking time set with the manual timer. I.V.C.

The driving means may include, for example, a mainspring that rotates and urges the operating shaft in a direction opposite to the winding direction, an escape wheel that is connected to the operating shaft, and a balance that is removably engaged with the escape wheel. and a solenoid that rotates the balance and intermittently rotates the operating shaft, but there is a possibility that such a mechanical structure may become temporarily or permanently locked.

When the lock state is reached, the heater continues to be energized for a long time beyond the cooking time set by the manual timer.

If the heater is energized for an abnormally long time in this way, not only will electricity be wasted, but the food will be overcooked, and in some cases, the food will catch fire. There is also a possibility that Moreover, the temperature of the entire cooker may rise abnormally, leading to damage to electronic components.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cooking device that can prevent abnormal heating even if the heater is energized for longer than a desired cooking time set by a manual timer.

[Means for Solving the Problems] In order to achieve the above object, the heating cooker according to claim 1 includes a heater provided in the heating chamber and a normally open type electrical circuit connected to the heater. A relay having an opening/closing switch, a rotationally operated photographing shaft, a manual timer having a drive means for rotating this operation shaft in the opposite direction to the winding direction, and a drive speed of the drive means being controlled by the above operation. A timer drive mode control means that is set with a plurality of drive modes that are changed in stages according to the winding angle of the shaft, a energization limit time that is longer than the longest scale time of the manual timer, and a energization limit that is set in advance. Firepower control means for stopping the relay as time passes;
A control device having at least a timer means for setting a cooking time by the manual timer and starting counting the time up to the energization limit time when the cooking time is determined. In order to achieve the above object, the heating cooker according to claim 2 includes a heater provided in the heating chamber, a relay having a normally open open/close switch connected to the energizing circuit for the heater, and a rotating a manual timer having an operating shaft to be operated and a driving means for rotating the operating shaft in a direction opposite to the winding direction; and a manual timer having a driving speed of the driving means in stages according to a winding angle of the operating shaft. A plurality of normal drive modes are set, as well as a fast return drive mode that has a faster drive speed than these normal drive modes, and a energization limit time that is longer than the longest scale interval of the manual timer is set in advance. , and a timer-drive mode control means that executes the quick return drive mode when the energization limit time elapses; the manual timer sets the cooking time, and the cooking time is set until the energization limit time is reached. In addition, in order to achieve the same object, in the heating cooker of claim 3, the heater provided in the heating chamber and , a relay with a normally open open/close switch connected to the energizing circuit for the heater, an operating shaft that is rotated, and a drive means that rotates the operating shaft in the opposite direction to the winding direction. a manual timer, a timer drive mode control means set with a plurality of drive modes for changing the drive speed of the drive means in stages according to the winding angle of the operating shaft, and the manual timer for each of the plurality of drive modes. The energization limit times longer than the longest scale time are set in advance, and the cooking time is set by the firepower control means that stops the relay when these energization limit times pass, and the manual timer, and the cooking time is set in advance. [Function] The invention according to claim 1, comprising: a control device having at least a timer means that starts counting the time interval up to the energization limit time for the drive mode including the cooking time according to a time setting. In this case, if the heater continues to be energized beyond the maximum scale time of the manual timer, the firepower control means of the control device stops the relay when the timer means of the control device counts the energization limit time. control to do so. Therefore, the on/off switch connected in series to the heater opens and stops energizing the heater. Therefore, even if the mechanical part of the manual timer locks, or even if the manual timer doubles the cooking time, the power to the heater will not continue for an abnormally long time. .

In the invention of claim 2, if the heater continues to be energized beyond the maximum time of the timer, then when the timer means of the control device counts the energization limit time, the timer of the control device is activated. A mode control means executes a fast return drive mode. Since this drive mode is faster than the other normal drive modes, the operating shaft of the manual timer is rewound in a short time, turning off the timer switch. Then, all control operations of the control device are cleared, and at the same time, the relay controlled by the firepower control means can be stopped. Therefore, the on/off switch connected in series to the heater opens and stops energizing the heater. Therefore, even if the cooking time is set twice by the manual timer, the heater will not be energized for an abnormally long time.

In the invention according to claim 3, the energization limit time for each of the plurality of drive modes set in the timer means of the control device is determined according to the setting of the cooking time by the manual timer, and the drive mode of the pasting strip that includes this time. selected by each. Then, the relay is stopped according to this energization limit time in the same manner as in the invention of claim 1 above. Therefore, since the relay is controlled to stop for each drive mode, even if the mechanical structure of the manual timer locks, or if the manual timer sets twice the cooking time, the heater will not be affected. The energization is not continued for an abnormally long time, and the time until the energization to the heater is stopped can be shortened.

[Example 7] Hereinafter, a first example in which the present invention is applied to a toaster oven will be described with reference to FIGS. 1 to 11.

Reference numeral 1 in FIG. 10 is a case constituting the outer shell of the toaster oven, and an opening/closing door 3 is rotatably attached to a front panel 2 of this case 1. There is an opening/closing door 3 inside the case 1.
A heating chamber 4 is formed with a front opening that can be opened and closed at
The heating chamber 4 is provided with a grill 5 and heaters 6 located above and below the grill 5, respectively. These upper and lower heaters 6 are connected in parallel or in series. Is this heater 6 a commercial AC through the plug 1a? Connected to Mi7 (see Figure 1).

Inside the case 1, there is a timer storage chamber 8 separated from the heating chamber 4.
(See FIG. 3) is formed, and this storage chamber 8 is provided with a manual timer 9 for setting the energization time to the heater 6. This manual timer 9 has a frame 10, as shown in FIGS. 3 and 4. frame 10
A bracket 11 is attached to the front surface 10a of the front panel 2, and this bracket 11 is screwed to the surface of the front panel 2.

An operating shaft 12 is rotatably supported on the upper part of the frame 10. The front end of the operating shaft 12 passes through the front panel 2,
A timer knob 4o is attached to the penetrating end.

The operating shaft 12 is artificially rotated in the timer winding direction and rewinding direction 7 together with the timer knob 40. When the operating shaft 12 is rotated in the timer winding direction, a mainspring (not shown) is wound up in conjunction with this, and due to the return force of this mainspring, the operating shaft 12 is rotated in the timer rewinding direction (see FIG. 8). It is urged to rotate in the direction of arrow A).

As shown in FIG. 3, a large gear 13 is attached to the operating shaft 12 and rotates integrally therewith. The large gear 13 meshes with a small gear 14 that is pivotally supported on the frame 10.
An escape wheel 15 is coaxially fixed to one end surface of 4. A balance 16 is arranged below the escape wheel 15. The balance 16 is connected to the frame 10 by a pivot 17 (Figs. 8 and 9).
(see figure), and this lever 16 has a pair of hooks that removably engage the teeth 18 of the escape wheel 15 at two points spaced apart in the circumferential direction. Claw portions 19a and 19b are provided.

A solenoid 21 for rotating the balance wheel 16 is attached to the lower rear surface 10b of the frame 10 via a bracket 20. The solenoid 21 is connected to a commercial AC power source Fj. Stabilization for solenoid that converts alternating current from 7 to direct current? l
It is connected to an S source 23 (see FIG. 1), and is excited by this power source 23 to magnetize the iron core 24.

Further, one end of a magnetic metal plate 25 is swingably locked to the bracket 20 so as to be spaced apart from and opposite to the iron core 24 . The other end of the magnetic metal plate 25 passes through a through hole 26 provided in the frame 10 and extends toward the balance 16, and a locking portion 27 provided at this other end is caught on a locking arm 31 of the balance 16. There is. The magnetic metal plate 25 is urged in a direction away from the iron core 24 by a tension spring 28.

This bias pushes up the locking portion 27 of the magnetic metal plate 25, and the balance wheel 16 is rotated counterclockwise as shown by arrow B in FIG. For this reason,
Of the engaging pawls 19a and 19b of the balance wheel 16, one of the engaging pawls 19a located on the rear side in the rotational direction of the escape wheel 15 engages the toothed portion 18, and escapes due to the return force of a mainspring (not shown). Rotation of the car 15 is prevented.

Further, when the magnetic metal plate 25 is attracted to the iron core 24, the ninth
As shown in the figure, the locking portion 27 of the magnetic metal bell 25 is pulled down, and the balance 16 is rotated clockwise as shown in the direction of arrow C in the figure.

Then, one of the latching claws 1 that was latching on the escape wheel 15
9a separates from the escape wheel 15, and the restriction on rotation of the escape wheel 15 is released, but the other latching pawl 19b enters between the teeth 18 of the escape wheel 15. Therefore, when the escape wheel 15 rotates by a certain angle due to the release of the rotation restriction, the other teeth 18 are latched to the latching claws 19b,
The escape wheel 15 is prevented from rotating again.

That is, the escape wheel 15 rotates by one pitch of the teeth 18 for each rotation of the balance wheel 16.
Since this rotation is transmitted to the operating shaft 12 via the small gear 14 and the large gear 13, the operating shaft 12 is intermittently rotated in response to the excitation of the solenoid 21. Therefore, in this embodiment, these large gear 13, small gear 14, escape wheel 1
5, balance 16, magnetic metal plate 25, and solenoid 2
1 constitutes two driving means for driving the imaging axis 21.

In addition, there is a timer knob 40 on the front panel 2 of the case 1.
A scale 30 indicating the cooking time is placed around the cooking time in 1 minute increments up to 30 minutes, and the cooking time is set by aligning the index protrusion 40a of the timer knob 40 with this scale 30. .

Further, as shown in FIG. 3, a first temporary cam 47 and a second plate cam 48 are fixed to the operating shaft 12. At positions facing the cam surfaces 47a and 48a of these plate cams 47 and 48, there is a timer switch, that is, a control device 4 to be described later.
A normally open enlargement switch 49 and a normal switch 50 are provided for switching between two timer drive modes.

These switches 49, 50 are equipped with cam followers 49a, 50a that are in contact with cam surfaces 47a, 48a, and when the operating shaft 12 is rotated in the winding direction via the timer knob 40, the cams 47a, 48a are shaped cam follower 49a. 50a is pushed up and the respective switches 49.
50 can be closed individually.

That is, in this embodiment, the indicator protrusion 4 of the timer knob 40
When 0a is in the off position, both switches 49.5
Both enlargement switches 4 and 9 are open when the index protrusion 40a is set for a short period of time from 1 to 15 minutes, and the normal switch 50 is closed when the index protrusion 40a is set for a short period of time from 15 to 30 minutes. It is designed to close when set for a long time. Therefore, the rotation angle of the operation shaft l2, that is, the set cooking time is detected by these switches 49 and 50, and the timer drive mode control means by the control device, which will be described later, turns the solenoid to 3.
It is designed to switch to either a first drive mode in which operating pulses are sent out at 0 second intervals or a second drive mode in which operating pulses are sent out at 1 minute intervals.

When the cooking time is set to a short time period in this type of drive mode, the driving speed of the drive mechanism 29 is doubled compared to when the cooking time is set to a long time period.
As shown in FIG. 7, the interval L1 between the scales 30 indicating the short time period is expanded to twice the interval L2 between the scales 30 indicating the long time period. This enlargement can improve the accuracy of setting m1 during cooking.

The solenoid 21 of the manual timer 9 is controlled by a control device 41 consisting of a microcomputer. As shown in FIG. 1, this control device 41 includes a timer means 42, a timer drive mode $1 l means 43, and a thermal power $1! j means 44 at least.

This @control device 41 is driven by a microcomputer power supply 36 that converts alternating current from a commercial alternating current power supply 7 into direct current and adjusts the voltage appropriately.

The cooking time is set in the timer means 42 via the manual timer 9, and the set time is determined by counting the number of pulses obtained by the oscillation circuit 45 connected to the control device 41. It is designed to start counting the time until the energization limit time.

A timer drive mode control means 43 is connected to the timer means 42 . This means 43 includes, for example, once every 30 seconds when the timer knob 40 is set to a short period of 15 minutes from the OFF state, and once every 30 minutes from 15 to 30 minutes. When adjusting to a long time zone, the operation pulse is applied to solenoid 2 at a rate of once per minute.
Each of the two solenoid drive modes sent to the first solenoid is programmed and set in advance. Therefore, when the timer knob 40 is set to the short time period, the timer drive mode control means 43 sets the energization interval to the solenoid 21, that is, the non-energization interval from one energization time to the next energization time, to 30 seconds, and vice versa. If the solenoid 21 is adjusted to a long duration period, the de-energization interval becomes one minute, and the energization of the solenoid 21 is controlled in these two solenoid drive modes.

Furthermore, a firepower control means 44 is connected to the timer means 42 . This control means 44 has a "heating stop" mode, that is, the maximum scale time of the manual timer 9 (for example, 30
The energization limit time (for example, 35 minutes) is set in advance, which is several minutes longer than the average time (for example, 35 minutes). When the elapse of this limit time is counted by the timer means 42, the firepower control means 4
4 is designed to stop a relay, which will be described later. Of course, this limit time is set to a time that can limit the temperature of the entire cooking device to an abnormal temperature when the heater 6 is continuously energized until that time.

The heating power control means 44 has several heating power modes in which the ratio of the energization time to the non-energization time to the heater 6 is equal to each other, such as "high heat" heating mode, "medium heat" heating power mode, and "
Low fire' fire power mode people are also preset. The "high fire" fire mode is a setting in which the non-energizing time is zero and the energizing time is continuous. In the "medium heat" thermal power mode, both the energizing time and the non-energizing time are set to 15 minutes, and these are alternately repeated. Further, in the "low heat" fire mode, the energization time is set to 8 minutes and the de-energization time is set to 22 minutes, and these settings are repeated alternately.

A relay 46 is connected to this control device 41. The relay 46 is formed with a normally open open/close switch 46a as a relay contact, and this open/close switch 46
A is connected to the energizing circuit for the heater 6. This relay 46 opens and closes the opening/closing switch 46a in accordance with the thermal power mode selected from among the plurality of thermal power modes determined by the thermal power control means 44. Thereby, in the case of the "heating stop" mode, the energization to the heater 6 is stopped, and in the case of other thermal power modes, the energization time and non-energization time to the heater 6 are controlled.

Furthermore, a printed wiring board 71 is attached to the back side of the front panel 2, as shown in FIG.

This judgment 71 includes a fire power switch 7 as a fire power selection means.
2 are attached, and light emitting elements 73 to 75 for the firepower display are attached, respectively, and each is exposed on the surface of the front panel 2. In the case of this embodiment, the fire power switch 72 is formed of an automatic reset type press button switch, and one of the plurality of fire power modes can be selected depending on the number of times the suppress button is operated. There is.

Each of the light emitting elements 73 to 75 is shaped like a light emitting diode, and the upper light emitting element 73 is for displaying a "high heat" fire power mode, and the middle light emitting element 74 is for displaying a "medium heat" power mode.
The lower light emitting element 75 is used to display the "low heat" heat mode. All of the light emitting elements 73 to 75 are turned on in blinking and continuously by the control device 41.

Further, on the back side of the front panel 2, as shown in FIG. 6, another printed wiring board 51 is attached to support the control device 41 and other electrical components.

A push-button type toast switch 52 dedicated to toasting buns is attached to this board 51 so as to be operable from the front side of the front panel 2. When this switch 52 is operated, the control device 41 selects the "high heat" heat power mode of the heat power control means 44, and also bakes bread at the dynamically set cooking time according to the program set for bread baking. It is designed to heat and cook food. Therefore, in this case, there is no need to operate the timer knob 40. Further, a cancel switch 56 for canceling the toasting operation by the toast switch 52 and a slide switch 57 for adjusting the browning color are also attached to the substrate 51 so as to be operable from the front side of the front panel 2. Further, numeral 38 in FIG. 1 is a buzzer that notifies the completion of cooking.

Next, the operation of this first embodiment will be explained with reference to FIG.

When the plug 1a is connected to an outlet, tTs If is turned on, and the control device 41 executes step 1 and determines whether the manual timer 9 has been activated.

Then, by operating this manual timer 9,
A cooking time is set in the timer means 42, and the determination in step 1 becomes YES (established). Then, the process proceeds to step 2, where it is determined whether or not at least one of the contacts of the manual timer 9, that is, the switches 49, 50, is closed. If this judgment is established, the process proceeds to step 3.
By executing this, the control device 41 excites the relay 46 via the thermal power control means 44. As a result, the open/close switch 46
a is closed, and power supply to the heater 6 is started. Next, the control device 41 executes step 4, and causes the timer means 42 to perform a counting operation for the time up to the energization limit time.
After starting the process, the process proceeds to step 5, where the timer drive mode control means 43 controls the excitation of the solenoid 21. Therefore, the solenoid 21 is intermittently excited in response to the operation pulse, and intermittently attracts the magnetic metal temporary 25 to rotate the balance 16. Therefore, each time the balance 16 rotates, the escape wheel 15 rotates by one pitch of the teeth 18 due to the spring's restoring force, and the operating shaft 12 is gradually rewound.

After this, in step 6, the indicator protrusion 4 of the timer knob 4o is
It is determined whether or not 0a has been rotated to the off position, that is, whether the timer contacts (four enlargement switches in the case of this embodiment) have been turned off. If this determination is established, the energization to the solenoid 21 is cut off, and the next step 7 is executed to stop the energization to the relay 46. therefore,
When the open/close switch 46a is opened, the power to the heater 6 is cut off and cooking is completed, and the buzzer 38 notifies this completion.
Alert by sounding.

In addition, in the rewinding operation of the manual timer 9 as described above, if the rewinding is locked due to a problem with the mechanical structure or if the cooking time is set twice, the determination in step 6 above will be made. is No, so in that case, the control device 41 continues with step 8. Then, the time counted by the timer means 42 is counted by the firepower control means 4.
7 set to 4, whether or not the eye degree time has elapsed is 1'
It is rejected. If this determination is NO, the process returns to step 6, and if the i-rejection is YES, the previously described step 7 is executed. Therefore, the relay 46 is de-energized and the open/close switch 46a is opened, so that the heater 6 can be de-energized.

In other words, if the rewinding of the manual timer 9 is locked for some reason as described above, or if a double time setting is made by mistake, the timer 6 will start energizing the heater 6. After a maximum of 35 minutes have elapsed, the power to the heater 6 can be automatically cut off. In this way, after the cooking time has elapsed, the heater 6 is kept energized for a long period of time, thereby preventing the entire cooking appliance from overheating abnormally.

Therefore, overcooking of food items and burnout of electronic components can be prevented, and unnecessary consumption of electricity can be prevented.

The procedure for controlling the firepower is shown in FIG. 11, and the procedure will be explained below.

When the plug 1a is connected to the outlet, the control device 41 executes step 21, blinks only the light emitting element 73 for displaying the "high flame" fire mode to indicate that the power is turned on, and then executes step 22. It is determined whether the heat switch 72 is on or not. If this determination is NO, the control device 41 automatically selects the "high flame" fire mode and proceeds to step 23 to determine whether the manual timer 9 has been operated. And this manual timer 9 is Lψ
When the judgment 1 analysis in step 23 is YES (established), it is determined in step 24 whether or not at least one of the contacts of the manual timer 9, that is, the switches 49 and 50 is closed. , step 25
is executed to excite the relay 46. Thereby, the open/close switch 46a is closed. Next, step 26 is executed, and only the light emitting element 73 for displaying the "high heat" power mode is used to indicate that cooking will be performed in the "high heat" power mode in a continuous manner.

In step 27, which is subsequently executed, the control device 41 starts the timer operation by the timer means 42, controls the relay 46 according to the "high fire" fire power mode by the fire power control means 44, and controls the relay 46 in the so-timer drive mode. The control means 43 controls the excitation of the solenoid 21 . Therefore, in the case of this thermal power mode, since the open/close switch 46 of the relay 46 is continuously maintained in a closed state, the heater 6 is continuously energized, and the heater 6 performs high-heat cooking. Further, the solenoid 21 is intermittently excited in response to the operation pulse, and intermittently attracts the magnetic metal plate 25 to rotate the balance wheel 16. Therefore, each time the balance 16 rotates, the escape wheel 15 is rotated by one pitch of the teeth 18 due to the restoring force of the mainspring, and the operation I11112 is gradually returned to its original position.

After this, in step 28, it is determined whether the indicator protrusion 40a of the timer knob 40 has been rotated to the off position, that is, whether the timer contact (in the case of this embodiment, the enlargement switch 49) has been turned off. When the judgment is established, the energization to the solenoid 21 is cut off, and the next step 2 is started.
9 to cut off the power to the relay 46. Therefore, the open/close switch 46a is opened, the power supply to the heater 6 is cut off, and cooking is completed, and the buzzer 38 is sounded to notify the completion of the cooking. In addition, after this cooking is completed,
Return to step 21. As a result, only the light emitting element 73 is blinked again to indicate that the power is turned on.

Furthermore, if the determination in step 22 is YES,
Proceeding to step 31, it is determined whether the fire power switch 72 has been pressed once and ONL has been turned on.

If this judgment is established, the control device 41 automatically selects the "medium heat" fire mode and proceeds to step 32, "
Only the light emitting element 74 for displaying the "medium heat" heat mode is flashed on and off. This will display the selection of the "medium heat" heat mode. After this, in step 33, it is determined whether the manual timer 9 has been operated. Then, this manual timer 9 is operated and the judgment in step 33 is YES (
If this is true, then in step 34 it is determined whether at least one of the contacts of the manual timer 9, ie, the switches 49, 50, is closed. Once that judgment is established,
Proceeding to step 35, the relay 46 is energized and its open/close switch 46a is closed.

Next, step 36 is executed, and only the light-emitting cord 74 for displaying the "medium heat" power mode is continuously lit to indicate that cooking will be performed in the "medium heat" power mode.

Then, in step 37 executed subsequently, the control device 41 starts the timer operation by the timer means 42, and controls the relay 46 according to the "medium heat" fire mode by the fire power control means 44,
In addition, since the solenoid 21 is opened and closed every minute by the timer drive mode control means 43, the heater 6 is energized intermittently every 15 minutes, and the heater 6 performs medium-heat cooking. At the same time, the solenoid 21 is intermittently energized in the same way as in the "high fire" fire power mode, and the escape wheel 15 The operating shaft 12 is gradually rewound by one pitch of the tooth portion 18. and,
This is followed by step 21 via step 28.9 above.
will be returned to.

If the determination in step 31 is NO, the process proceeds to step 42, where it is determined whether the thermal power switch 72 has been pressed twice and turned ON. If this determination is established, the control device 41 automatically selects the "low heat" power mode, and proceeds to step 42, where only the light emitting cord 75 for displaying the "low heat" power mode is flashed on and off. Thereby,
Displays the selection of "low heat" heat mode. After this, in step 43, it is determined whether or not the manual timer 9 has been operated. Then, when the manual timer 9 is operated and the judgment in step 43 becomes YES (established), step 4
At step 4, it is determined whether at least one of the contacts of the manual timer 9, ie, the switches 49 and 50, is closed. If the determination is established, the process proceeds to step 45, where the relay 46 is energized and the open/close switch 46a is closed.

Next, step 46 is executed, and only the light emitting element 75 for displaying the "low heat" mode is lit continuously to indicate that cooking will be performed in the "low heat" mode.

Then, in step 47 executed subsequently, the control device 41 starts the timer operation by the timer means 42, and controls the relay 46 according to the "low heat" fire power mode by the fire power control means 44,
In addition, since the solenoid 21 is repeatedly opened and closed for 22 minutes after being closed by the timer drive mode control means 43, the heater 6 is energized intermittently every 22 minutes, and the heater 6 performs low-heat cooking. Ru. At the same time, the solenoid 21 is intermittently energized in the same way as in the "high heat" firepower mode, and the magnetic metal plate 2 is
5. Gradually rewind the operating shaft 12 by one pitch of the teeth 18 of the escape wheel 15 via the balance 16, escape wheel 15, and mainspring.

After this, the process returns to step 21 via steps 28 and 29 described above.

If the determination in step 41 is No, the process proceeds to step 51, where it is determined whether the thermal power switch 72 has been pressed three times and turned ON. When this determination is established, the control device 41 executes step 52 and turns off each of the light emitting elements 73 to 75. In this case, even though the control device 41 is actually energized, by turning off the light emitting elements 73 to 75, the toaster oven can be brought into a state as if it were in a non-energized state. Furthermore, if the determination in step 51 is No,
Step 53 is executed to determine whether the heat switch 72 has been pressed four times and turned ON. If this determination is NO, the control device 41 carries out step 52, and if the determination is YES, it determines that one selection cycle of the thermal power mode has been completed and returns to step 21. The power-on state is indicated by flashing lighting of the light emitting element 73 for displaying the "high fire" fire power mode.

As described above, by operating the relay 46 based on each thermal power mode of the thermal power mode control means 44 determined in the control device 41, the opening/closing switch 46a of the relay 46 connected in series with the heater 6 is opened and closed. 6 ■
, +7 and the non-energization time, the heating power of the heater 6 can be controlled to be "strong,""medium," or "weak."

In other words, while keeping the heat generated by the heater 6 itself constant,
Thermal power can be controlled by controlling the amount of electricity supplied to the heater 6 during an arbitrary heating time set by the manual timer 9 using the selected thermal power mode of the control device 41. No need to switch wattage. Therefore, it is possible to eliminate the need for diodes and many switches that were conventionally required for controlling the heat power, so that the food can be heated and cooked by selecting a plurality of levels of heat power with a simple configuration.

Further, during cooking according to the selected heating power mode as described above, the light emitting element corresponding to this heating power mode is controlled by the control device 41, and the light emitting element flashes or lights up continuously. As a result, when the thermal power mode is selected, only the corresponding light emitting element is flashed on and off, and after selection, only the light emitting element is lit continuously to indicate that the heater 6 is energized. Therefore, it is possible to visually notify the user of the selection of the firepower mode and which firepower mode is being used for cooking.

Next, a second embodiment of the present invention will be described with reference to FIG. This embodiment differs from the first embodiment in that the manual timer 9 is quickly rewound to stop the relay 46 when the energization limit time has elapsed.

In other words, the timer drive mode control means 43 has a plurality of regular drive modes set therein, that is, in addition to the first drive mode and the second drive mode described in the first length embodiment, the timer drive mode control means 43 also controls a quick return drive mode. have. This fast return drive mode is faster than the drive speed of the first drive mode (operation pulses are sent out at 30 second intervals).
For example, this is a mode in which operating pulses are sent out at intervals of 0.5 seconds.

Furthermore, the control means 43 has a energization limit time longer than the longest scale time of the manual timer 9 set in advance, and the control means 43 executes the early return drive mode when the energization limit time elapses. Like IIIS
has been completed. Therefore, only a plurality of firepower modes are set in the firepower control means 44. Note that the other configurations are the same as those of the first embodiment, so explanations will be omitted.

According to this embodiment, after steps 1 to 4 are executed in the same manner as in the first embodiment, in step 5, the timer drive mode control means 43 causes the normal drive mode to be set in the short time period or long time period. Controls excitation of the solenoid 21. Further, step 8 is executed when it is determined in step 6 that the four enlargement switches of the timer 9 are not turned off, and it is determined once whether the energization limit is exceeded. If this determination is No, the process returns to step 5, and if the determination in step 8 is established, step 9 is executed. By executing step 9, the tighter drive mode control means 43 controls the excitation of the solenoid 21 in the fast return: Ie-drive mode. In other words,
Since the solenoid 21 is energized once every 0.5 seconds,
The operating shaft 12 of the manual timer 9 is quickly rewound. Therefore, after the energization limit time has elapsed, the enlargement switch 49 of the manual timer 9 can be turned off immediately. By doing so, all action by controller 41 is cleared, resulting in normally open switch 46a of relay 46 being opened.

Therefore, even if the cooking time is set twice due to an erroneous operation, it is possible to prevent the entire rice cooker from being abnormally heated.

Further, a third embodiment of the present invention will be explained with reference to FIG.

In this embodiment, the energization limit time is set for each drive mode of the manual timer 9, and the relay 46 is set for each drive mode.
This embodiment differs from the first embodiment in that abnormal heating is precisely prevented by controlling. Note that the other configurations are the same as those of the first embodiment, so explanations will be omitted.

That is, the thermal power control means 43 has an energization limit time longer than the longest scale time of the manual timer 9 corresponding to each of the plurality of drive modes set in the timer drive mode control means 44. By the way, for a short time (1
In the case of 5 minutes), the energization limit time is set to 20 minutes, and in the case of a long period (30 minutes), the energization limit time is set to 35 minutes. The timer means 42 is configured to count the number of times until the energization limit time in the time period that includes the cooking time according to the cooking time set therein.

In this third embodiment, it is determined in step 2 whether the normal switch 50 of the manual timer 9 is turned on, and if the determination is No, the enlargement switch 49 of the manual timer 9 is turned on in step 3. tll Il'i to see if it was. If the judgment in step 3 is established, the relay 46 is activated in step 4, and then the process proceeds to step 5, where the timer means 42 counts the time until the energization limit of one hour is set for the short time period. Start. In step 6, the timer drive mode control means 43 controls the excitation of the solenoid 21 in accordance with the first drive mode among the normal drive modes. In other words, since the finger floating protrusion 40a of the timer knob 40 is located in a short time period, the solenoid 21 receives an operation pulse sent once every 30 seconds and is energized. In the next step 7, it is determined whether the enlargement switch 49 is off, and if the determination is established, the energization to the solenoid 21 is cut off, and the next step 8 is executed to turn off the relay 46.
Stop energizing. Therefore, the open/close switch 46a
is opened, the power supply to the heater 6 is cut off, and the process is completed, and the buzzer 38 is sounded to notify the completion of the process. Also, if 'I'll + fold in step 7 is NO (
In other words, if the four enlargement switches are not turned off, 'Fi'
+ If the power supply is disconnected), step 9 is executed and the energization limit is set to 1. It is determined at t'l1 whether time +i has elapsed. If this judgment is NO, the process returns to step 7, and if the result of the judgment in step 9 is positive, step 8 is carried out.

If the determination in step 2 is No, step 10 is performed to operate the relay 46, and then the process proceeds to step 11, where the timer means 42 is set for the energization eye intensity time set for the long period of time. Start counting the time until. Then, in the next step 12, the timer drive mode control means 43 controls the excitation of the solenoid 21 in accordance with the second drive mode of the normal drive mode. In other words, the index protrusion 40a of the timer knob 40 is held for a long time.
1}, the solenoid 21 is excited in response to an operation pulse sent once a minute. Also,
In the next step 13, it is determined whether the normal switch 50 is off, and if the answer is OFF or NO, the process returns to step 12. Moreover, when the judgment of the step-steep 13 is established, the step-socket 14 is activated, so the timer drive mode control means 43 controls the excitation of the solenoid 21 in accordance with the first drive mode of the normal drive mode. Then, this solenoid 21 is operated by the operation pulse sent once every 30 seconds. In the next step 15, it is determined whether or not the four expansion switches are off, and if the determination is true, step 8 is executed. Further, if the determination in step 15 is NO, step 16 is executed. Based on this execution, it is determined whether or not the energization limit time set for the long time period has elapsed. If this is true, the step knob 9 is executed, and if not, the process returns to step 15.

Therefore, since the abnormal energization to the heater 6 can be stopped within the energization limit time determined for each drive mode as described above, the period of 11,lr until the energization to the heater 6 is stopped can be shortened, and the abnormal heating We will carry out detailed prevention measures.

It should be noted that the present invention is not limited to toaster ovens, but can of course be applied to ovens and ranges with heaters.

[Effects of the Invention] As explained above, in the applying and pasting thickener according to claims 1 and 3, the mechanical structure of the manual timer is locked and the
Even if there is a situation where the heater continues to be energized beyond the desired time, such as when the heating time is set twice, it is possible to cut off the energization to the heater at the predetermined time, It is possible to prevent the entire four-dimensional device from being abnormally heated, and furthermore, claim 3
In the case of 11!, until the power supply to the heater is stopped at that time! By shortening the distance between f, abnormal heating can be more reliably prevented. Further, according to the heating regulator according to claim 2, when there is double setting of one heating time,
Cut off the power to the heater for a predetermined time and press X! IJ! I
! It is possible to prevent the entire container from being abnormally heated.

[Brief explanation of drawings]

1 to 11 illustrate the first embodiment of the present invention,
Fig. 1 is a block diagram, Fig. 2 is a flowchart showing the control procedure of the abnormal heating cycle, Fig. 3 is a cross-sectional view of the manual timer, Fig. 4 is a view seen from the arrow direction in Fig. 3, Figure 5 is a front view of the operation panel of the toaster oven, Figure 6 is a sectional view taken along the line Vl-Vl in Figure 5, Figure 7 is a front view showing the relationship between the timer knob and the scale, Figures 8 and 6 are FIG. 9 is an explanatory diagram showing the operation of each drive mechanism, FIG. 10 is a perspective view of the entire toaster oven, and FIG. 11 is a flowchart showing the control procedure for the thermal power mode. FIG. 12 is a flowchart showing a control procedure for avoiding abnormal heating according to the second embodiment of the present invention. FIG. 13 is a flowchart showing a control procedure for avoiding abnormal heating according to the third embodiment of the present invention. 4...Heating chamber, 6...Heater, 9...Manual timer 12...Operating shaft, 2...Drive means, 41...
Control device, 42... Timer means, 43... Timer drive mode control means, 44... Firepower control means, 46
... Relay 4 6 ... Open/close switch.

Claims (1)

[Claims] 1. A heater provided in a heating chamber, a relay having a normally open open/close switch inserted into an energizing circuit for this heater, an operating shaft that is rotated, and this operating shaft. a manual timer having a drive means for rotating the drive means in a direction opposite to the winding direction; and a timer set with a plurality of drive modes for changing the drive speed of the drive means in stages according to the winding angle of the operating shaft. A drive mode control means, a power supply control means having an energization limit time set in advance that is longer than the longest scale time of the manual timer, and a fire power control means for stopping the relay when the energization limit time elapses, a cooking time set by the manual timer. and a control device having at least a timer means that starts counting the time until the energization limit time according to the setting of the cooking time. 2. A heater installed in the heating chamber, a relay with a normally open open/close switch inserted into the energizing circuit for this heater, an operating shaft that is rotated, and this operating shaft rotated in the opposite direction to the winding direction. a manual timer having a drive means for rotating the drive means in the direction; and a plurality of normal drive modes in which the drive speed of the drive means is changed in stages according to the winding angle of the operating shaft;
In addition, a fast return drive mode is set that has a faster drive speed than these normal drive modes, and a energization limit time that is longer than the maximum scale time of the manual timer is set in advance, and this energization limit time is set in advance. At least a timer drive mode control means for executing the quick return drive mode according to the progress, a timer means for setting the cooking time by the manual timer, and starting counting the time up to the energization limit time by setting the cooking time. A heating cooker comprising: a control device having a control device; 3. A heater installed in the heating chamber, a relay with a normally open open/close switch inserted into the energizing circuit for this heater, an operating shaft that is rotated, and this operating shaft rotated in the opposite direction to the winding direction. a manual timer having a drive means for rotating the drive means; a timer drive mode control means having a plurality of drive modes for changing the drive speed of the drive means in stages according to the winding angle of the operating shaft; The energization limit time which is longer than the maximum scale time of the manual timer for each of the plurality of drive modes is set in advance, and the heating power control means stops the relay when the energization limit time elapses, and the manual timer is used for cooking. A control device having at least a timer means for setting a cooking time and starting counting the time up to the energization limit time for the drive mode including the cooking time according to the setting of the cooking time. A heating cooker.