JPH02276190A - Electric apparatus having turntable - Google Patents

Abstract

PURPOSE:To easily pick up a material from a turntable when the heating is finished by providing a stopping means by which driving control of the turning of the turntable is immediately stopped when the foremost point during the starting time of turning drive of the turntable falls in a predetermined range of the front part of the turntable. CONSTITUTION:When the setting timer for heating process time is finished, the content of the timer setting is cleared, and the driving of a magnetron is stopped, whereby microwave heating is finished. If the content of a turntable timer T.TIME is 0, the turning of a turntable 5 is stopped at the same time when the heating is finished, the turntable 5 having turned by natural number. When the turntable 5 is turned by any natural number, and is further turned not more than 1/4 times or not less than 3/4 time, the foremost point is situated in the front half of the circumference of the turntable 5, whereby the turning is immediately stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an electric device such as a microwave oven having a turntable.

(b) Conventional Japanese Patent Application Publication No. 47-8293 discloses a microwave oven configured so that the position of food placed on a turntable in the heating chamber remains the same even when heating is finished. There is.

Therefore, when placing food on the turntable,
If food is placed on the turntable near the front of the heating chamber where it can be placed easily, the turntable will be stopped so that the food will be placed at the front of the heating chamber even when heating is finished, so the food will be placed on the turntable near the front of the heating chamber. Removing food is as easy as placing it.

However, in this case, if the food is slightly past the placement position when heating is just finished, the turntable will continue to rotate almost one full rotation even after heating has finished, and during this time the food will not be placed. You have to wait for it to be taken out, and the waiting time at this time feels long.

The object of the present invention is to facilitate the removal of the material from the turntable, and also to enable such removal to be carried out quickly when desired.

(D) Means for Solving the Problems The present invention includes a storage, a turntable placed in the storage and for rotating an object placed thereon, a motor for driving the turntable, and a motor for driving the motor. In an electric device having a turntable, the control section includes a control section that controls the rotational drive of the turntable by controlling energization, and the control section controls the rotation of the turntable to a predetermined range toward the front of the turntable at a desired time. The present invention is characterized in that it has a stopping means for immediately stopping the rotational drive control of the turntable when the foremost point at the start of driving is located.

(e) At a desired point, such as at the end of action heating, the most forward point at the start of rotation of the turntable is located in a predetermined range toward the front of the turntable, and the object is at the same position as the placement position. Even in the vicinity of this point, the rotational drive control of the turntable is immediately stopped. Therefore, even if the object is slightly past the placement position at the desired time, the turntable is immediately stopped at this time, so that the object can be taken out quickly.

In this way, even if the turntable is not stopped at the same position as when it is placed, the turntable is stopped near that position, making it substantially easier to take out the object.

(F) Embodiment FIGS. 1 and 2 show the structure of a microwave oven according to an embodiment of the present invention, which is a storage compartment where microwaves are supplied from a magnetron (1) and whose front opening is opened and closed by a door (2). Heating cabinet (
3) is provided with a turntable (5) at its bottom for rotating the placed object, that is, the food (4).

The turntable is engaged with and connected to the output shaft (7) of a synchronous motor (6) with a built-in reducer fixed to the lower side of the heating chamber (3), and the turntable is driven by the synchronous motor (6). A rotation of the table (5) is made.

FIG. 3 shows a circuit of the microwave oven, which is provided with a microcomputer (8) as a control section for controlling the microwave oven. And such a microcomputer (
8) is a keyboard (9) for setting heating conditions, etc., a door switch (10) that turns off and on in response to the opening and closing of the door (2), and a pulse of the same frequency as the power source for inputting commercial power. The magnetron (1) receives various desired signals from the pulse generator (11), which generates microwaves, and rotates the dinner table (5). Synchronous motor (
6) Control the output of etc.

FIG. 4 shows the flow of the control program installed in the microcomputer (8), and the operation of the microwave oven will be described in detail below with reference to the diagram.

When the commercial power is turned on to the microwave oven, the S1 step is first executed, and the pulse generator (11) generates 60Hz.
If 50Hz is determined, step S2 is executed, and if 50Hz is determined, step 83 is executed. These S2, S
In each step of step 3, the time required for the turntable (5) rotated by the synchronous motor (6) to make one revolution is set in the turntable cycle register TCYC in the computer (8).

Here, the synchronous motor (6) has a characteristic that the rotation speed is constant when the frequency of the applied commercial power source is constant, and the time for one rotation of the turntable (5) is constant. . In this case, if the power supply frequency is 60Hz, the time for one rotation of the turntable (5) is 10 seconds,
50)-1z is 12 seconds.

Therefore, in step S2, 10 seconds is set in the turntable cycle register TCYC in response to 60 Hz, and in step S3, 12 seconds is set in response to 50 Hz.

Next, after step S4 is executed, steps S5 and S6 are executed cyclically. In step S4, all rewritable areas in the computer (8) except the turntable cycle register TCYC are initialized. In step S5, operation setting information on the keyboard (9) is input, and in step S6, it is determined whether or not the start key has been operated on the keyboard (9) based on such input.

When performing microwave heating, place the food (4) on the turntable (5), close the door (2), set the desired microwave heating time using the keyboard (9), and press the start key. Manipulate. Then, this information is input and each step of f&S7 and S8 is executed. In step S7, the contents of the turntable cycle register TCYC, ie, one rotation time, are stored in the turntable timer T-TIME in the computer (8). In this case, the contents of cycle register TCYC are not cleared. In step S8, commercial power is applied to the synchronous motor (6), the turntable (5) begins to rotate, and the magnetron (1) is driven to start microwave heating of the food (4). At this time, the food (4) is rotated by the turntable (5), so it is heated uniformly. Further, in step S8, measurement of elapsed heating time is started.

It is determined whether or not the time has reached the desired microwave heating time. If the arrival judgment is made, such judgment is made in S4.
It remains until it is initialized by the step.

In step S10, it is determined whether the turntable (5) is rotating. In the Sll step, the turntable timer T-TIME starts decrementing,
In step S12, it is determined whether or not the contents of the turntable timer T and TIME have become 0 due to such a decrease. In step S13, it is determined whether at least one of the end flag ENDF and the interruption flag INT in the computer (8) is set. In step S14, it is determined whether a heating interruption command has been generated by turning off the door switch (10) by opening the door (2), operating the stop key on the keyboard (9), or the like.

In the above-mentioned cyclic execution of steps S9 to S14, when the count of the turntable timer T-TIME continues to decrease and its content becomes O, the above-mentioned cyclic execution ends at step S12,
Next, steps S15 and S16 are executed, and then step S14 is executed. In step S15, the time reduction operation in the turntable timers T and TIME is completed, and the contents of the turntable cycle register TCYC are stored in the timer T.TIME again in the same manner as in step t&s7. In this case as well, the contents of the register TCYC are not cleared.

The S16 step is the same as the S13 step.

Then, since the contents of the timer T-TIME are no longer 0, steps S9 to S14 are executed again in a circular manner. Thereafter, during the cyclic execution of steps S9 to S14, the timer T-T
Each time the content of the IME becomes 0, steps 815 and S16 are executed.

Then, as this state continues, heating progresses, and when the elapsed heating time eventually reaches the desired microwave heating time, the above-mentioned circulation execution ends in step S9, and then in step S17.
Each step of S18 is executed. In step S17, an end flag ENDF is set, and in step S18, the counting of the heating elapsed time is finished, the content of the counting is cleared, and the magnetron (1) is stopped, and the microwave heating is finished.

And, just at this time, the turntable timer T・TIME
If the content of is 0, then SIO, S11
．． Each step of S12, S15, and S16 is executed, and then S19. Each step of S20 is executed. S
At step 19, the application of power to the synchronous motor (6) is stopped and the turntable (5) immediately stops rotating. S2
At step 0, it is determined whether the end flag ENDF is set. In this case, since the end flag ENDF is set in step S17, the f&s4 step is executed, and the state is such that steps S5 and S6 are executed in a circular manner, waiting for the next key operation for heating.

Here, the turntable (5) stops rotating at the same time as the heating ends, and in this case, the turntable (5) is in a state where it has rotated exactly a natural number of times. That is, the timer T.TIME is in a state in which the contents of the turntable cycle register TCYC (one rotation time) are decremented by a natural number of times. Therefore, when placing the food (4) on the turntable (5) for heating,
If the food (4) is placed on the turntable (5) near the front of the heating chamber (3) where it can be easily placed, the food (4) will remain in the heating chamber even when the turntable (5) stops rotating. Since the food (3) reaches the same position closer to the front, it is easy to take out the food (3) from the turntable (5) in the same way as when placing it.

If the contents of the turntable timer T-TIME are not 0 at the end of the microwave heating, S17 and S1
8. S13 after each step of SIO to S12 is executed
Step is executed.

Since the end flag ENDF is set at this time, step S21 is executed thereafter. In step S21, the contents of timer T-TIME are stored in cycle register T.
It is determined whether the contents of CYC are 18 or less, or the contents of cycle register TCYC are 38 or more. This corresponds to determining whether the turntable (5) has rotated an arbitrary natural number of times and then further rotated within a range of 18 times or less or 38 times or more.

Therefore, in this case, the contents of timer T-TIME are TCYC
/4 or less or TCYC・374 or more, S
After step 21, step S19 is executed, and the turntable (5) immediately stops rotating.

Here, if the contents of timer T and TIME are below TCYC/4 or above TCYC-', the foremost point at the start of rotation of the turntable (5) (at the start of heating) rotates an arbitrary natural number of times. Furthermore, the turntable has been rotated 18 times or less or 374 times or more, and the foremost point is located at any point on the front half of the circumference of the turntable (5) (range of arrow W in Figure 2). There is. Therefore, if the food (4) is placed on the front half of the turntable (5) near the frontmost point (the diagonal line W in FIG. Although the food (4) is not at the same position as when it was placed, it is located closer to the front, so the food (4)
) is still easy to remove.

In this way, at the end of heating, the turntable (5) rotates an arbitrary natural number of times, and even if it continues to rotate less than 18 times or more than 38 times, it immediately stops rotating at that point. 4) can be taken out quickly.

Step SL9, which is executed after step S21 and in which the turntable (5) is stopped rotating, corresponds to the stopping means of the present invention.

If a negative determination is made in step S21, then step S22 is executed, and it is determined whether or not the interruption flag INT is set. In this case, there is no set, so next step S14 is executed, and then S9 and S1
7, S18, S10, S11. S12, S13, S21
, S22, and S14 are executed cyclically. During this period, the turntable (5) continues to rotate, and if the continued rotation results in an affirmative determination in step S21, the turntable (5) stops rotating as described above.

During the heating process, if the heating is to be interrupted to check the heating status of the food (4), open the door (2) or operate the stop key on the keyboard (9). Then, the cyclic execution of steps S9 to S14 ends at step S14, and then step S23 is executed. Such S
In step 23, the interruption flag INT is set, and the measurement of the elapsed heating time is interrupted, and the magnetron (1) is stopped, and the microwave heating is interrupted.

Therefore, if the content of the T-degree timer T-TIME is 0 at the time of such interruption, S10, S11, S12
, S15, S16, S19, S20, S22, and S24 are executed once, and the turntable (5)
stops rotating immediately. Thereafter, 5IO1S24 steps are executed cyclically. Also, the contents of timer T and TIME are T.
If it is less than CYC/4 or more than TCYC 374, S
10, S11, S12, S13, S21, S19, S2
Steps 0, S22, and S24 are executed in the same cycle;
At this time as well, the turntable (5) immediately stops rotating.

Thereafter, 5IO1S24 steps are similarly executed in a circular manner. Also, if the content of timer T-TIME is neither less than TCYC/4 nor more than TCYC-'/4, 5IO1S11
．． Steps S12, S13, S21, S22, and S24 are executed cyclically, and when an affirmative determination is made in step S21, the turntable (5) is stopped from rotating, and thereafter steps S10 and S24 are similarly executed cyclically. In step S24, it is determined whether or not the start key on the keyboard (9) has been operated.

Here, it can be seen that the timing of stopping the rotation of the turntable (5) is the same as that at the end of heating, and therefore, the ease of taking out the food (4) and the promptness in collecting the food (4) are As already mentioned.

In the cyclical execution of the 5IO5S24 steps, if the condition of the food (4) is checked and the start key is operated again with the door (2) closed, the steps from S8 onwards will be executed. Therefore, the rest of the heating process and the operation of the turntable (5) are as described above.

(G) Effects of the Invention According to the present invention, in a configuration having a function of controlling the rotation stop position of the turntable, it is possible to easily take out an object from the turntable at a desired time (such as when heating is finished), and Such removal can be performed quickly when desired.

Furthermore, in this embodiment, the ease and speed of such collection is achieved based on the control of the turntable rotation time by a microcomputer, so there is no need for any structural complexity. do not have.

[Brief explanation of drawings]

The drawings relate to a microwave oven according to an embodiment of the present invention, and FIG. 1 is a front sectional view, FIG. 2 is a plan sectional view, FIG. 3 is a circuit diagram, and FIG. 4 is a flowchart of a control program. (3)... Heating cabinet, (5)... Turntable, (
6)...Synchronous motor, (8)...Microcomputer.

Claims (1)

[Claims] (1) A storage, a turntable arranged in the storage for rotating objects placed thereon, a motor for driving the turntable, and a rotational drive of the turntable by controlling power supply to the motor. In an electric device having a turntable comprising a control unit that performs control, the control unit is configured to perform control such that when the foremost point at the start of rotational drive of the turntable is located in a predetermined range toward the front of the turntable at a desired time, An electric device having a turntable, characterized in that it has a stop means for immediately stopping rotational drive control of the turntable.