JPH0759984B2 - Turntable equipment - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turntable device such as a microwave oven, and more particularly to a turntable device having a characteristic regarding how to stop the rotation thereof.

[Conventional technology]

As an example of this type of conventional technique, a case of a turntable device used in a microwave oven will be described below.

In the conventional turntable device, the rotational position of the turntable is detected by some position detecting device, and based on this, when the cooking of the turntable is stopped and the rotation of the turntable is stopped, the rotational position of the turntable is equal to that before the rotation start. The rotation position is controlled to be the same.

A conventional example of this type of device is shown in FIG. 4, for example.

FIG. 4 is an explanatory diagram showing an outline of a microwave oven using a conventional turntable device.

In FIG. 4, (1) is an external housing, (2) is a heating chamber,
(3) is a turntable on which a cooking container (4) on which an item to be cooked is placed is rotated around a rotating shaft (3a) during cooking time. The cooking container (4) is provided with a handle (4a) so that it can be easily carried and taken out. (5) is a motor as a drive means for rotating the turntable (3), and (6) is a disc mounted on the rotating shaft (3a) in parallel with the turntable (3). An elliptical light transmitting portion (6a) is provided at one edge of the.

(7) is a light emitting element, (8) is a light receiving element, (9) is a motor control device for controlling the operation of the motor (5) by inputting a signal from the light receiving element (8), and (10) is a cooking time or the like. This is an input switch for setting and operating the microwave oven.

Next, the operation will be described with reference to FIGS. 4, 5, and 6. FIG. 5 is an explanatory diagram showing an example of a state in which the cooking container (4) is placed on the turntable (3) of the microwave oven shown in FIG. In FIG. 5, (11) is an opening for putting the cooking container (4) in and out of the heating chamber (2), and (12) is a door for opening and closing the heating chamber (2). FIG. 6 is a flow chart showing the operation of this microwave oven.

When cooking an article to be cooked (hereinafter appropriately referred to as a dish) with a microwave oven, first open the door (12) and place the cooking container (4) containing the dish on the turntable (3). At this time, the user puts the handle (4a) of the cooking container (4) into the heating chamber (2) as shown in FIG. 5 in order to easily put the cooking container (4) in and out of the heating chamber (2). ) Place the cooking container (4) so that it faces the side close to the opening (11). In this state, the door (12) is closed and cooking is started.

As shown in step S ₁ of the flow chart in FIG. 6, the input switch (10) is operated to set and input the cooking time, and the microwave oven starts heating and the motor (5) turns the turntable (3). Rotates at a constant speed in a constant rotation direction. In this example, the turntable (3) rotates once in 10 seconds. When the turntable (3) rotates,
As shown in step S ₂ , the light transmitting portion (6a) provided on the disk (6) rotating about the same rotation axis (3a) as the turntable (3) has a light emitting element (7) once every 10 seconds. ),
Each time, the light receiving element (8) receives the light from the light emitting element (7).

Receiving light-receiving element (8) is a motor control device (9) in step S ₃ by entering a signal indicating that it has received to the motor control device (9), in the elapsed time from the start cooking time set Based on this, the remaining cooking time T _{0 at} that time is calculated. If the remaining cooking time T ₀ is less than 10 seconds, that is, if the cooking time is reached before the turntable (3) makes another revolution, the process proceeds to step S ₄ . In step S ₄ , the motor controller (9) stops the turntable (3) at the time of the remaining cooking time T ₀ .

In step S _3, if the remaining cooking time T ₀ which is calculated is not less than 10 seconds, the process proceeds to step S _5. In step S _5, the motor controller (9) to continue rotating the motor (5) drives the turntable (3).

When the turntable (3) continues to rotate, the step S ₂ is resumed.
The light transmitting portion (6a) provided on the disc (6) crosses the light emitting element (7).

By controlling the rotation of the turntable (3) by the operation described above, the turntable (3) is stopped at the same rotation position as when it was stopped before the rotation was started, when the cooking was completed and the rotation was stopped. It will be. That is, if the cooking container (4) is placed as shown in FIG. 5 before the heating and cooking by the microwave oven, the cooking container (4) is as shown in FIG. Since the handle (4a) of the cooking container (4) is stopped at the rotation position toward the side close to the opening (11) of the microwave oven, the user can easily take out the cooking container (4).

[Problems to be Solved by the Invention]

In the conventional turntable device as described above, since the physical rotation position of the turntable is detected, for example, a user or the like may wait between the time when the turntable stops and the time when the next turntable starts rotating. If the rotational position of the turntable is misplaced by mistake, the timing of the detection of the first rotational position after the start of rotation and the actual turntable will become one.
There is a problem in that there is an error in the timing of rotation, so that the stop position of the turntable at the end of the operation of the device also differs from the desired rotation position.

Further, in order to stop the turntable at a desired rotation position, some kind of position detection mechanism for detecting the rotation position of the turntable was provided.

As a result, the structure of the turntable device as a whole becomes complicated, and the number of parts increases, so that the manufacturing work is troublesome and costly.

The present invention has been made to solve the above problems, and does not include a position detection mechanism for detecting the rotational position of the turntable, and is independent of the rotational position of the turntable at the time of starting rotation. It is an object of the present invention to obtain a turntable device capable of stopping a rotary table at a desired rotation position.

[Means for Solving the Problems]

In the turntable device according to the first aspect of the present invention, a preset rotation period from the start of rotation of the turntable to the stop of rotation is set as a fixed value, and this rotation period and the standard required for the turntable to make one rotation by the drive means. A predetermined calculation is performed based on the rotation cycle, and a new rotation cycle of the turntable for stopping the turntable at a desired rotation position is obtained based on the value of the calculation result, and the operation of the drive means is controlled. A rotation period calculation means for resetting the control amount for the above is provided based on the new rotation period.

Further, the turntable device according to the second and third inventions,
A preset rotation period from the start of rotation of the turntable to the stop of rotation is set as a fixed value, and a predetermined calculation is performed based on this rotation period and a reference rotation period required for the turntable to make one rotation by the drive means. Based on the value of this calculation result, a new rotation cycle of the turntable for stopping the turntable at a desired rotation position is obtained, and a control amount for controlling the operation of the drive means is set to the reference rotation cycle and the above-mentioned control amount. A rotation cycle calculation means for resetting based on a new rotation cycle is provided.

[Action]

In the first aspect of the invention, when the turntable is stopped, the rotation cycle calculation means obtains a new rotation cycle of the turntable for stopping the turntable at a desired rotation position, and the new rotation cycle is set to the new rotation cycle. Based on this, the control amount for controlling the operation of the drive means for rotating the turntable is reset.

In addition, in the second and third aspects, when the turntable is stopped, the rotation cycle calculation means obtains a new rotation cycle of the turntable, and further, the reference rotation cycle of the turntable and the new rotation cycle are set. Based on this, the control amount for controlling the operation of the drive means for rotating the turntable is reset.

In the case of the third invention, the control amount is reset based on the new rotation cycle after the start of rotation of the turntable.

〔Example〕

 Examples of the present invention will be described below.

FIG. 1 is an explanatory view showing the outline of an embodiment of a microwave oven using a turntable device according to the present invention, and FIG. 2 is a flow chart showing the operation of the microwave oven of this embodiment.

In this embodiment, a case will be described in which the turntable (3) is stopped at the same rotational position as when it was stopped before the start of heating and cooking at the end of heating and cooking.

Although setting the cooking time T ₁ before starting cooking, it is assumed that the cooking time T ₁ is has a function as a rotation period until rotation is stopped from rotation start of the turntable (3).

In FIG. 1, reference numerals (1) to (5), (9) and (10) indicate the same or corresponding portions as those of the conventional example, and the description thereof will be omitted as appropriate.

(13) is a rotation cycle calculator, which is an input switch (10).
When the cooking time T ₁ is input according to, the reference rotation period T _N of the turntable (3) set at that time is a value that is an integer fraction of the cooking time T ₁ or not. Determine based on calculation. However, the value of cooking time T ₁ is a fixed value.
When the reference rotation cycle T _N is an integer fraction of the cooking time T ₁ , the reference rotation cycle T _N is the optimum rotation cycle for rotating the turntable (3) once. Also when the reference rotational period T _N is not summer and an integral fraction of the cooking time T ₁ is determined by calculating the time closest to the reference rotation cycle T _N in an integer fraction of the time of the cooking time T _1, The time is set as an optimum rotation period T _S that is a new rotation cycle of the turntable (3).

Although (9) is a motor control device, unlike the conventional example, the motor (5) is driven and stopped based on the input from the rotation period calculation device (13).

Further, in this embodiment, the motor (5) is a synchronous motor.

Next, the operation of the microwave oven using the turntable device of this embodiment will be described with reference to FIGS. 1, 2 and 5.

First, as shown in FIG. 5, the user places the handle (4a) on the turntable (3) so that the cooking container (4) can be easily taken out, facing the side close to the opening (11), and the door (12). Close.

In this state, as shown in step S ₁₁ , the input switch (1
Set and enter the cooking time T _{1 according} to 0). The cooking time T ₁ input by the input switch (10) is input to the rotation cycle calculator (13) as shown in step S ₁₂ . Next, in step S ₁₃ , the rotation period calculation device (13) inputs the reference rotation period T _N of the turntable (3) which has already been set in the rotation period calculation device (13) at this time to the cooking time T ₁ of whether the integer fraction of 1 and the summer is determined based on the operation, if it is determined that the summer and an integral fraction proceeds to step S _14.

In step S _14, the reference rotational period T _N, and set the optimal rotation period for stopping the turntable (3) when the cooking ends at the same rotational position and the rotational position before the start of rotation,
Proceed to step S ₁₅ . Step rotation period calculation unit in S ₁₅ (13) is to the motor control device (9) for setting a control amount based on optimal rotation period T _N. The control amount includes, for example, a current value. When the control amount is set, the motor control device (9) starts the motor (5) as shown in step S ₁₆ to start the rotation of the turntable (3), and then the turntable (9) as shown in step S _17. The motor (5) is stopped when the time T _{1 has} elapsed after the start of the rotation of 3), that is, the rotation of the turntable (3) is stopped.

On the other hand, the rotation period calculation unit in step S ₁₃ (13)
However, if it is determined that the already set reference rotation period T _N is not an integral fraction of the input cooking time T ₁ , the process proceeds to step S ₁₈ .

In step S _18, rotation period calculation unit (13), the first value of an integer fraction of the cooking time T ₁ obtained by calculation value closest T _S to the value of the reference rotational period T _N, the process proceeds to step S _19. Step S
In _19, a new rotation period T _S determined by calculation and set the optimal rotation period, the process proceeds to step S _20. Rotation period calculation unit in step S ₂₀ (13), the motor control device (9)
A control amount based on the optimum rotation cycle T _S is set for. When the control amount is set, the motor control device (9) goes to step S
_As shown in ₁₆ , the motor (5) is started to start the rotation of the turntable (3), and as shown in step S ₁₇ , after the start of rotation of the turntable (3), when the time T _{1 has} elapsed, the turn is made. Stop the rotation of the table (3).

As a second embodiment, as shown in the flow chart of FIG. 3, a new rotation cycle T _S calculated as the rotation cycle of the turntable (3) (however, in this example, T _S = T _N +
It is also possible to use the reference rotation period T _N together. In the case of this embodiment, it is possible to rotate by a new rotation cycle T _S only for a fixed time of the entire cooking time T ₁ and rotate the rest of the time by the reference rotation cycle T _N.

For S ₄₂ will be described from the step S _34, S ₃₅ and step S ₃₈ that indicates the feature of this embodiment for the flow chart of Figure 3.

First, at step S ₃₄ , T ₁ is divided by T _N to find the remainder K. If T _N is not an integer fraction of T ₁ in step S ₃₅ , that is, if the remainder K obtained by dividing T ₁ by T _N is K ≠ 0, the process proceeds to step S ₃₈ .

Turntable (3) with reference rotation period T _N at step S ₃₈
After rotation to start and counting the remaining cooking time in step S _39, until the time the remaining cooking time is T _N + K is rotated at a reference rotational period T _N. Proceeds to step S ₄₀ when the remaining cooking time has come T _N + K, the turntable (3)
The rotation cycle is set to a new rotation cycle T _S based on the value of the calculation result obtained in the previous step S ₃₄ , and in step S ₄₁ , the rotation cycle calculation device (13) sets the turntable (3) to the new rotation cycle. The control amount for rotating at T _S is set in the motor control device (9). As a result, as shown in step S ₄₂ , the turntable (3) rotates only for the last one rotation with a new rotation cycle T _S , and as shown in step S ₃₇ , when the cooking time T ₁ has elapsed, the turntable (3) is rotated. ) Stops rotating.

As described above, in the turntable device according to the present embodiment, since the control of the rotation stop of the turntable (3) is performed based on the input cooking time and the rotation cycle of the turntable (3), the cooked food is cooked. It is possible to stop the turntable (3) at the same rotation position as that at the start of rotation regardless of the rotation position of the turntable (3) at the start, that is, at the start of rotation, at the end of heating and cooking. For this reason, the user can take out the cooking container (4) in an easy-to-remove state after heating and cooking without worrying about the rotational position of the turntable (3) at the start of rotation.

Further, there is no need to provide any position detecting mechanism for detecting the rotational position of the turntable (3), and there is an effect that the structure of the entire turntable device is simplified.

Further, in the case of the second embodiment, of the total cooking time, the turntable (3) is rotated for a fixed period only in a new rotation cycle, and most of the remaining time is rotated in the reference rotation cycle. , It takes less time for the motor (5) to be loaded more than necessary.

Further, in the case of the second embodiment, it is possible to reset the control amount based on the new rotation cycle after the rotation of the turntable (3) is started. Therefore, when the user inputs the cooking time with the input switch (10), the heating cooking can be started without waiting for the time for resetting the control amount.

In each of the above-described embodiments, the case where the turntable (3) is stopped at the desired rotation position, for example, at the same rotation position as when the rotation is started, is at the end of heating and cooking, but as another embodiment, The door (12) is also used when heating cooking is interrupted at any time during heating, that is, while the turntable (3) is rotating, and the cooking container (4) is taken out.
It is possible to control the turntable (3) to rotate until it reaches the desired rotation position and then stop even after the heating operation is interrupted by opening the
The same effect can be obtained. In this case, a switch (not shown) that is turned on / off in synchronization with opening / closing of the door (12) is provided, and the operation of opening the door (12) causes the turntable (13) to turntable (13). The interrupt stop signal for stopping 3) is input.

Further, in each of the above-described embodiments, the case where the desired rotation position for stopping the turntable (3) is set to the same rotation position as that at the time of starting the rotation has been described, but as another embodiment, the turntable (3) is used. It is possible to stop at a rotation position different from that at the time of rotation start, for example, at a rotation position different from that at the time of rotation start by 90 °, and according to various conditions such as the number of handles (4a) of the cooking container (4), Turntable (3)
There is an advantage that it is possible to set the stop position of.

〔The invention's effect〕

As described above, according to the present invention, in the turntable device, in order to stop the rotating turntable at a desired rotation position, the rotation cycle calculation means adds a new rotation cycle for stopping the turntable at the desired rotation position. Then, the drive control means for controlling the operation of the drive means for rotating the turntable is reset with the control amount based on the new rotation cycle.

In this way, since the rotation stop control of the turntable is performed based on time, it is possible to stop the rotation at a desired rotation position regardless of the rotation position of the turntable at the time of rotation start. I can.

Further, there is no need to provide any position detection mechanism for detecting the rotational position of the turntable, and the structure of the entire turntable device can be simplified.

Further, in the case of the second and third inventions, the turntable is rotated in a new rotation cycle only for a fixed time in the entire rotation period, and most of the remaining time is rotated in the reference rotation cycle. It takes less time for the means to be overloaded than necessary.

Further, in the case of the third invention, since the control amount based on the new rotation cycle is reset after the rotation of the turntable is started,
When the user or the like sets and inputs the rotation period, the rotation of the turntable can be started without waiting for the time for resetting the control amount based on the new rotation period.

In addition to resetting the control amount, it is also possible to perform calculations to obtain a new rotation cycle after the start of rotation.
This makes it possible to realize a faster turntable rotation start.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an outline of an embodiment of a microwave oven using a turntable device according to the present invention, and FIG.
FIG. 3 is a flow chart showing the operation of the embodiment of the microwave oven shown in FIG. 3, FIG. 3 is a flow chart showing the operation of the second embodiment of the microwave oven shown in FIG. 1, and FIG. 4 is a conventional turntable device. Illustration of the outline of the microwave oven
1 is an explanatory view showing an example of a state in which a cooking container is placed on the turntable of the microwave oven shown in FIGS. 1 and 4, and FIG. 6 is a flow chart showing the operation of the conventional microwave oven shown in FIG. Is. In the figure, (3) is a turntable, (5) is a motor, (9) is a motor controller, and (13) is a rotation period calculator. The same reference numerals in each figure indicate the same or corresponding parts.

Claims (3)

[Claims] 1. A turntable device comprising a turntable, a drive means for rotating the turntable, and a drive control means for outputting a control amount for controlling the operation of the drive means, the turntable being provided by the drive means. Performs a predetermined calculation based on a reference rotation period required for one rotation of the turntable and a preset rotation period from the start of rotation of the turntable to the stop of rotation of the turntable. A turntable device, comprising: a rotation cycle calculation means for obtaining a new rotation cycle of the turntable for stopping at a rotation position and resetting the control amount based on the new rotation cycle. 2. A turntable comprising a turntable, drive means for rotating the turntable, and drive control means for outputting a controlled variable for controlling the operation of the drive means, wherein the turntable is driven by the drive means. Performs a predetermined calculation based on a reference rotation period required for one rotation of the turntable and a preset rotation period from the start of rotation of the turntable to the stop of rotation of the turntable. A turn including a rotation cycle calculation means for obtaining a new rotation cycle of the turntable for stopping at the rotation position and resetting the control amount based on the reference rotation cycle and the new rotation cycle. Table device. 3. The turntable device according to claim 2, wherein the control amount is reset based on a new rotation period after the rotation of the turntable is started.