JPH07208746A - Heating cooker - Google Patents

Abstract

PURPOSE:To detect an accurate food weight by a simple structure despite a shape of a placing tray and to reduce abnormal sound at the time of detecting the weight and wears of the tray and its bearer. CONSTITUTION:A disclike bearer 6 is coaxially fixed to a rotary support shaft 5 disposed substantially at a center of a heating chamber 1. Three or more support rollers 60 are mounted around a radial pivotal shaft of the bearer 6. The rollers 60 are rotatably brought into contact with a lower surface of the tray 2 to support the tray 2. When a weight of food A on the tray 2 is detected via a support load of the shaft 5, the shaft 5 and the bearer 6 are rotated to eliminate influence of a deviation of the placing position of the tray 2, thereby obtaining a detected result accurately corresponding to the real weight of the food A. In this case, the bearer 6 is smoothly loosely rotated upon rolling of the rollers 60 to the tray 2, abnormal sound due to the loose rotation is alleviated, and wears of the tray 2 and the bearer 6 are reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating cooker in which heating control is performed so as to obtain an appropriate heating state according to the weight of food in a heating chamber.

[0002]

2. Description of the Related Art The weight of food to be cooked is detected in a heating chamber, and the food is controlled under appropriate heating conditions by heating control that controls one or both of a heating time and a heating output based on the detected weight. A heating cooker adapted to automatically cook has been put into practical use. This heating control is a microwave oven that uses microwaves introduced into the heating chamber to heat the food, an electric oven that uses the heat rays emitted by the heater inside the heating chamber, an microwave oven that uses both the microwave and the heater, etc. It is widely practiced in heating cookers equipped with electrically controllable heating means. In addition, in the microwave oven, switching of the heating method between microwave heating and heater heating is also included in the heating control.

In carrying out such heating control as described above, it is important to accurately detect the weight of food. This weight is detected as a support load of the above-mentioned plate which is detected by the load sensor by disposing a load sensor on the support part of the plate for placing food placed inside the heating chamber. . In many cases, the mounting plate is supported on a support shaft projecting substantially in the center of the bottom surface of the heating chamber, and the load sensor is a base end of the support shaft extending outside the heating chamber. It is arranged in a manner to support.

[0004]

However, when such an arrangement mode is adopted, when the food is placed at a position apart from the central portion of the placing plate which is the supporting portion by the support shaft, the food is placed. As a result, the load of the load sensor acts unevenly on the load sensor, and the detected load of the load sensor and the actual weight of the food do not correspond, and erroneous heating control is performed based on this detected load to obtain a satisfactory finished state. There is an inconvenience.

In a microwave oven that heats food by the action of microwaves, the spindle of the above-mentioned plate is used for the purpose of equalizing the action of microwaves on each part of the food and preventing uneven heating. A configuration has been widely adopted in which a rotary spindle that is rotationally driven about the center is used, and by rotating the rotary spindle, cooking is performed while rotating food together with a circular placing plate (turntable). . In this case, as disclosed in Japanese Utility Model Laid-Open No. 4-70903 and the like, the load sensor is arranged at the base end of the rotary support shaft to detect the load while rotating the mounting tray, whereby the above-mentioned mounting is performed. It is known that the influence of the deviation of the placement position can be eliminated and the food weight can be accurately detected.

On the other hand, electric ovens, microwave ovens, etc.
In a heating cooker equipped with a heater as a heating means,
In order to make effective use of the internal volume of the heating chamber, a rectangular mounting plate (square plate) having a planar shape corresponding to the bottom surface of the heating chamber is often used, and the supporting load of such a mounting plate is It cannot be detected while rotating as in the case of the circular plate.

In Japanese Laid-Open Patent Publication No. 4-29937, a pair of support rails extending in the front and rear direction are provided on opposite side walls of a heating chamber, and both side edges of a rectangular placing tray are supported by the support rails, respectively. A heating cooker is disclosed in which a load acting on a support rail is guided to a load sensor arranged outside the heating chamber via a transmission member and a link mechanism. With this configuration, it is possible to accurately detect the weight of the food on the rectangular plate, and the heating control based on the detection result can be performed without error.

However, this heating cooker requires a complicated mechanism for transmitting the supporting load of the placing plate to the load sensor, and has a drawback that it cannot be applied to a microwave oven having a turntable as the placing plate. In addition, in the microwave oven using the circular loading tray and the rectangular loading tray, separate load sensors are required to detect the weight of food on the respective loading trays, which further complicates the configuration. There is a problem of inducing

The present applicant has already proposed a heating cooker that solves the above problems (Japanese Patent Application No. 5-122792). This is a disk-shaped pedestal that is coaxially fixed to the tip of a rotary support shaft that projects from the center of the bottom of the heating chamber, and a circular or rectangular mounting tray is mounted and supported on this pedestal. It has been configured. When a circular mounting tray is used, the mounting tray is rotated by the rotation of the rotary support shaft due to the frictional resistance with the pedestal, and serves as a turntable for eliminating uneven heating. As mentioned above, the weight of the above food is
The load sensor provided at the base end of the rotation spindle accurately detects the load during the rotation.

On the other hand, even in the case of using a rectangular mounting tray, the supporting load is detected while rotating the rotary support shaft. At the beginning of the rotation, the mounting tray rotates due to friction with the pedestal, and its peripheral portion is brought into contact with the peripheral wall of the heating chamber to be restrained, but the pedestal also stops after this. Since it rotates freely against the friction with the placed plate, the load for supporting the food on the plate acts evenly on the load sensor, enabling accurate detection of the food weight. Becomes

That is, in this heating cooker, a rotary mounting shaft for supporting a circular mounting plate serving as a turntable supports a rectangular mounting plate, and a common mounting plate is provided at the base end of the rotating support shaft. The weight sensor of the can accurately detect the weight of food on both dishes, and the complicated mechanism for this is not necessary. It is an excellent cook that is cooked.

However, when the above-mentioned weight is detected in the case of using the rectangular mounting tray, the pedestal is allowed to rotate freely due to sliding with respect to the mounting tray, so that an abnormal noise is generated due to the sliding contact between the two. Then, there is an inconvenience of causing misunderstanding that some abnormality has occurred. In addition, the sliding contact surfaces of the mounting tray and the pedestal wear with the repetition of the free rotation, and the gap between the two increases with time, which hinders the weight detection described above. When the wear progresses, there is a disadvantage that the circular mounting tray mounted on the pedestal cannot be properly supported and rotation of the turntable is hindered.

The present invention has been made in view of the above circumstances, and enables accurate detection of food weight with a simple structure regardless of the shape of the placing tray, and a receiver for this purpose. An object of the present invention is to provide a heating cooker which reduces wear between a table and a placing plate, eliminates abnormal noise during weight detection, and eliminates poor support of the placing plate.

[0014]

A heating cooker according to the present invention comprises a placing plate supported by a rotary support shaft projecting from a bottom surface of a heating chamber and having a planar shape corresponding to the bottom surface. A heating cooker that detects the weight of food placed on a placing plate as a load acting on the rotating spindle while rotating, and performs heating control to perform appropriate heating according to the detected weight. And a pedestal that is coaxially fixed to the tip of the rotation spindle and is laid side by side on the pedestal so as to be rotatable around a pivot in the radial direction of the rotation spindle. And three or more supporting rollers that are in contact with each other.

[0015]

In the present invention, the pedestal is coaxially fixed to the tip of the rotary support shaft, and three or more support rollers that can rotate around the radial axis of the rotary support shaft are arranged on the pedestal. A loading tray having a shape corresponding to the bottom surface of the heating chamber and which cannot rotate in the heating chamber is supported on a receiving table by rolling each supporting roller on the lower surface of the loading dish. The weight of food on this plate is
It is detected as a load acting on the rotation support shaft while rotating the support base together with the rotation support shaft, and at this time, the rotation of the support base occurs due to the rolling of the support roller with respect to the mounting tray whose rotation is restricted, It is possible to suppress the generation of abnormal noise due to the direct sliding contact between the placing tray and the pedestal, and reduce the abrasion of the placing tray and the pedestal.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings showing the embodiments. FIG. 1 is a schematic diagram showing a configuration of a heating cooker according to the present invention. In the figure, reference numeral 1 is a heating chamber, and a plate 2 is placed on the bottom surface 10 of the heating chamber 1. A magnetron 3 serving as a microwave oscillation source is provided outside the heating chamber 1 on one side.
Is fixed via a waveguide 30 that opens to the upper side wall on the same side, and a heater 4 is attached below the top surface 11 inside the heating chamber 1.

At the center of the bottom surface 10 of the heating chamber 1, the bottom surface 10 is
A rotary support shaft 5 is provided so as to be orthogonal to the shaft center, and a disk-shaped pedestal 6 is coaxially fixed to the tip of the rotary support shaft 5. The pedestal 6 is mounted and supported. As the placing plate 2, a rectangular plate having a planar shape corresponding to the bottom surface 10 of the heating chamber 1 or a circular plate capable of rotating in the heating chamber 1 can be used.

FIG. 2 is an enlarged sectional view of an essential part showing a supporting state of the rectangular mounting tray 2, and FIG. 3 is a plan view from above schematically showing the supporting state of the rectangular mounting tray 2. As shown in these figures, four support rollers are provided on the outer periphery of the receiving table 6.
60, 60 ... Are rotatably mounted around the respective pivots projecting outward in the radial direction at positions equidistantly arranged in the circumferential direction. This mounting is carried out in such a manner that a part of the peripheral surface of each of the rollers 60, 60 ... Projects at least on the surface side of the pedestal 6 by substantially the same height.

An annular projection 20 is formed on the back surface of the rectangular placing tray 2 supported on the pedestal 6 so as to have an inner diameter substantially equal to the circumference of the supporting rollers 60, 60. Yes,
As shown in FIG. 2, the mounting tray 2 includes support rollers 60, 60 ...
By rolling the inside of the annular projection 20 so as to separate it from the surface of the pedestal 6 by the projecting height of each of the support rollers 60, 60 ... And the movement in the radial direction is restrained by the annular projection 20. Supported by.

The other side of the rotary support shaft 5 extends through the bottom plate of the heating chamber 1 to the outside and is connected to the geared motor 7. The geared motor 7 includes a motor main body 71 inside a housing 70 fixed to the lower portion of the heating chamber 1, and a drive gear 72 fitted to an output shaft of the motor main body 71, which is located in the middle of the rotary support shaft 5 penetrating the housing 70. The drive gear of the motor main body 71 is transmitted to the rotation support shaft 5 through deceleration by the drive gear 72 and the driven gear 73 to rotate the pedestal 6. There is.

The rotation of the cradle 6 as described above causes the cradle 6 to rotate.
It is also transmitted to the rectangular mounting plate 2 supported above, and the mounting plate 2
Although it also rotates, this rotation is restricted by abutting the four corners on the peripheral wall of the heating chamber 1, as indicated by the chain double-dashed line in FIG. In the heating cooker according to the present invention, as described above, since the mounting table 2 is supported on the plurality of supporting rollers 60, 60 ..., The rotation of the receiving table 6 restrains the mounting plate 2. After that, the support rollers 60, 60 ... Roll smoothly and continue. Further, this rolling occurs using the inner circumference of the annular projection 20 as a guide, and there is no fear that the position of the placing tray 2 after restraint will change as the pedestal 6 rotates.

The pedestal 6 as described above is also used to support the circular mounting tray 2 which is to be a turntable. FIG. 4 is an enlarged sectional view of an essential part showing a supporting state of the circular mounting tray 2, FIG.
[Fig. 3] is a plan view from above schematically showing a supporting state of a circular mounting tray 2. As shown in these figures, on the back surface of the circular mounting tray 2 supported on the pedestal 6, four recesses 22 corresponding to the mounting positions of the support rollers 60, 60 on the pedestal 6 side are provided. , 22 ... are provided, and as shown in FIG. 4, the loading tray 2 has support rollers 60, 60 ... In each of the recesses 22, 22.
, And is supported by directly contacting the inside of the recesses 22, 22 ... With the surface of the pedestal 6.

The circular mounting tray 2 supported as described above is
Due to the friction with the surface of the pedestal 6, the pedestal 6 is rotated about its axis as the pedestal 6 is rotated, and this rotation is not hindered in the heating chamber 1. Can serve as a turntable. Further, at this time, since the recesses 22, 22, respectively fitted into the support rollers 60, 60 ... Have a function of restraining the relative movement with respect to the pedestal 6, the placing plate 2 described above has a radial direction and a circumferential direction. Stable rotation with no deviation.

The rotary support shaft 5 supporting the pedestal 6 is provided with a housing 70 of the geared motor 7 and a pair of upper and lower radial bearings 7.
The load in the thrust direction acting on the rotary support shaft 5 merely supported by the rotary shafts 4 and 75 penetrates the housing 70 and extends downward, and the load sensor 8 is arranged at the base end of the rotary support shaft 5.
To join. The load sensor 8 is only required to be capable of converting the supporting load of the rotary support shaft 5 into an electric signal, and for example, the deformation of the pressure sensitive body to which the supporting load is applied is converted into a resistance value or an electrostatic capacitance. It is possible to use a load sensor configured to take out by utilizing the change, but to the extent that the displacement of the rotation support shaft 5 due to the deformation does not hinder the engagement between the drive gear 72 and the driven gear 73 in the geared motor 7. Is required to be small.

The output of the load sensor 8 is given to the control unit 9 as shown in FIG. 1, and the output of the control unit 9 is the heating chamber 1
It is applied to the magnetron 3 and the heater 4 attached to the gear motor 7, and is also applied to the geared motor 7.
The control unit 9 includes a CPU, a data RAM, and a program R.
It is a microprocessor including an OM and performs a control operation of issuing an operation command to the magnetron 3 or the heater 4 and the geared motor 7 in accordance with a program stored in the ROM in advance. The input from the load sensor 8 is used to determine the operating time and output of the magnetron 3 or the heater 4, that is, one or both of the heating output and the heating time in the heating chamber 1.

In the heating cooker configured as described above, the food A to be cooked is placed on the placing plate 2 supported on the receiving table 6, and the front door 13 (see FIGS. 3 and 5). ) Is closed, the heating chamber 1 is closed, and heating cooking is started. At this time, the control unit 9 first issues an operation command for a predetermined time to the geared motor 7 to rotate the rotation support shaft 5 and the pedestal 6,
During this period, the outputs of the load sensor 8 are sequentially taken in, the outputs are averaged, and the weights of the placing tray 2, the receiving table 6 and the rotary support shaft 5 are reduced to recognize the weight of the food A.

The weight of the food A on the plate 2 is added to the load sensor 8 via the pedestal 6 and the rotary support shaft 5. In this addition mode, the weight of the food A on the plate 2 is increased. Change with bias. When the circular loading tray 2 is used, the loading tray 2 rotates together with the food A on the upper side as the pedestal 6 rotates, and as a result, the load sensor 8 is loaded into the control unit 9 as described above. The output is a supporting load in a state where various deviations occur in the food A on the placing tray 2, and the result of averaging these results eliminates the influence of the deviation on the placing tray 2 and It corresponds to the actual weight of A with high accuracy.

On the other hand, when the rectangular mounting tray 2 is used, the rotation of the mounting tray 2 due to the rotation of the pedestal 6 is restrained by abutting the four corners on the peripheral wall of the heating chamber 1. However, the rotation of the pedestal 6 is continued with the rolling of the support rollers 60, 60, ...
Similarly to the case of using, the output of the load sensor 8 that is taken into the control unit 9 becomes the supporting load when the food A on the placing tray 2 has various deviations, and the result of averaging these is Therefore, the actual weight of the food A on the plate 2 can be accurately handled.

At this time, the pedestal 6 freely idles with the rolling of the support rollers 60, 60, and the generation of abnormal noise due to this rotation can be kept at a low level.
There is no risk of affecting the detection result of. In addition, since the pedestal 6 is freely rotated without directly contacting the rectangular mounting tray 2, the wear of the pedestal 6 with time is kept at a low level, and the circular mounting tray 2 is prevented. It can be reliably rotated during use.

The control unit 9 determines the heating time and heating output required for heating and cooking the food A using the weight of the food A obtained as described above, and the result and the operation panel connected to the input side. According to the heating method set to P (see FIG. 1), a heating control operation for driving one or both of the magnetron 3 and the heater 4, which are heating means, is performed. Circular plate 2
Is used, the control unit 9 further issues a continuous operation command to the geared motor 7.

By this operation, the food A is rotated into a circular loading tray 2 or a rectangular loading tray 2 which holds the restrained position.
In the above, microwave heating by the action of microwaves emitted by the magnetron 3, oven heating by the heat rays emitted by the heater 4, or a combination thereof is used for heating and cooking under an appropriate heating output and heating time, and a good finished state is obtained. To be The shape (circular or rectangular) of the plate 2 is
The operation specified by the operation of the operation panel P and the above-described operation of the control unit 9 is performed according to this specification.

The shape of the pedestal 6 for supporting the loading tray 2 is not limited to the disk shape shown in the above embodiment, but any shape can be used as long as it can stably rotate around the axis of the rotary support shaft 5. May be included. FIG. 6 is a plan view showing another embodiment of the present invention. In this figure, four support arms 6a, 6a are radially formed around the boss portion fitted to the rotary support shaft 5. And project the support rollers 60, 60 at their tips.
The pedestals 6 each of which is pivotally supported are used, and according to this configuration, the effect of reducing the rotating weight can be obtained.

Further, the supporting rollers 60 that are in rolling contact with the mounting tray 2
The number of 60 ... Is not limited to the four shown in the embodiment, and may be set appropriately, but in order to stably support the placing tray 2, three or more support rollers 60, 60 are provided. You need to have ... Further, the positions of the respective support rollers 60, 60 ... Can be set appropriately within the range of the size of the receiving table 6, but in order to enable stable support of the mounting tray 2, As shown in the embodiment, it is desirable that the pedestals 6 are arranged at equal intervals on the circumference in the vicinity of the outer circumference.

[0034]

As described in detail above, in the heating cooker according to the present invention, the placing plate having a shape corresponding to the bottom surface of the heating chamber is supported on the rotary support shaft through the pedestal, and this placing is performed. The weight of the food on the plate is detected as the supporting load of the rotary spindle while the pedestal is rotated, so a detection result that accurately corresponds to the actual weight of the food is obtained, and heating control based on this detection result is performed. A good finish can be obtained stably, and the rotation of the pedestal during the detection of the weight of food smoothly occurs with the rolling of the support roller rolling on the lower surface of the tray, which causes abnormal noise. It is mitigated, it can be prevented from being mistakenly recognized as abnormal due to the hearing of this abnormal sound, the wear of the cradle can be reduced, and the use of the turntable will not be hindered. The present invention has excellent effects.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a configuration of a heating cooker according to the present invention.

FIG. 2 is an enlarged sectional view of an essential part showing a supporting state of a rectangular placing tray.

FIG. 3 is a plan view schematically showing a supporting state of a rectangular placing tray.

FIG. 4 is an enlarged sectional view of an essential part showing a supporting state of a circular placing tray.

FIG. 5 is a plan view schematically showing a supporting state of a circular placing tray.

FIG. 6 is a plan view showing a supporting state of a placing tray according to another embodiment of the present invention.

[Explanation of symbols]

 1 Heating Chamber 2 Placement Plate 3 Magnetron 4 Heater 5 Rotating Spindle 6 Cradle 7 Geared Motor 8 Load Sensor 9 Control Unit 22 Recess 60 Support Roller

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroyuki Uehashi 2-5-5 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A loading plate supported by a rotary support shaft projecting from a bottom surface of the heating chamber and having a planar shape corresponding to the bottom surface, and a weight of food placed on the loading plate. A heating cooker that is detected as a load acting on the rotating support shaft during rotation and that controls heating to perform appropriate heating according to the detected weight, and is coaxial with the tip of the rotating support shaft. A pedestal fixed to the pedestal, and three or more support rollers that are rotatably arranged side by side on the pedestal around the pivot in the radial direction of the rotation support shaft and roll-contact with the lower surface of the plate. A cooking device characterized by the above.