JPH0443990Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a mounting device for a turntable drive mechanism built into a microwave oven or the like.

<Prior art> In recent years, when food is placed on a turntable installed inside a microwave oven, its weight is automatically detected, and the cooking time is selected based on the weight, type, etc. of the food. A microwave oven configured as follows has been proposed.

Conventionally, this type of microwave oven has a built-in turntable drive mechanism unit with a weight detection function as shown in FIG. This unit has a turntable pivot 1 connected to the drive mechanism of a motor 2 so that it can rotate freely, while each end is cantilevered by a leaf spring mounting member 3 disposed on the left side of the figure. Two supported upper and lower leaf springs 4, 5
A turntable drive mechanism 6 including the turntable pivot 1 is mounted and supported on the free end side of the turntable. Then, the movable pole plate 8, which is connected to and fixed to the turntable drive mechanism 6 side, is set to be placed close to and opposite to the fixed pole plate 7, which is connected to and fixed to the leaf spring mounting member 3 side. and bipolar plate 7,
The change in the gap width between the turntables 8 and 8 is taken as a change in capacitance, and by converting this into a frequency, the weight of the food on the turntable can be detected.

However, the fixed electrode plate 7 and the movable electrode plate 8, which constitute the weight detection section, are set at positions below the outside of the two upper and lower leaf springs 4, 5, and the oven bottom plate 9
Since a cheese yoke 10 is formed on the top of the turntable drive mechanism 6 to prevent radio wave leakage from the turntable pivot insertion part 9a, the height of the entire unit becomes significantly large (height H), which increases the bulk of the device. Not only this, but also direct impact and other external factors are likely to be applied to the bipolar plates 7 and 8 during transportation and handling. If the width of the gap between the plates 7 and 8 changes, this will lead to a situation like this.

The unit is attached to the oven bottom plate 9 using a mounting bracket 11 which is fixed to the upper part of the turntable drive mechanism 6 to form a chain 10 and which is used to attach the unit to the oven bottom plate 9.
This was done by inserting the screws 12, 12 into the screw insertion holes of the oven bottom plate 9 from inside the oven and tightening the screws. Therefore, the workability of tightening the screws is poor, and the heads of the screws 12, 12 are exposed to the bottom wall of the oven, making it difficult to clean.

<Purpose> The present invention has been made in view of the above-mentioned drawbacks, and includes fixing a mounting bracket to the oven bottom plate for screwing the turntable drive mechanism from the mechanism side to the oven bottom plate. By forming a yoke that prevents radio wave leakage from the turntable pivot insertion part of the oven bottom plate, the height of the turntable drive mechanism unit can be reduced, and the unit can be attached to the oven bottom plate from the unit side. The purpose of this is to improve the workability of installation and to improve the poor cleaning performance caused by the screw heads being exposed inside the oven.

<Example> An example of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal cross-sectional view of a main part showing an embodiment of the present invention, in which a leaf spring mounting member 15 is fixed to the inner wall of a housing 14 containing a turntable drive mechanism 13. As shown in FIG. This leaf spring mounting member 15 has two leaf springs 16, 1 provided vertically facing each other.
7 are attached in a cantilevered manner. On the other hand, the lower half of a turntable pivot 18 erected to support a turntable (not shown) at its upper end is disposed inside the housing 14, and the lower end of the turntable pivot 18 is mounted on a thrust bearing 19. It is rotatably supported by. Further, a motor 20 serving as a rotational drive source for the turntable pivot 18 and a drive force transmission gear group 21 connecting the motor 20 and the turntable pivot 18 are connected to both the leaf springs together with the turntable pivot 18 and the like. Both leaf springs 16, which are arranged between 16 and 17 and are flexible and cantilevered,
17 via the support member 24 at its free end side. Further, a fixed electrode plate 22 whose one end is screwed to the leaf spring mounting member 15 side is provided between the leaf springs 16 and 17, while a support member 24 on the free end side of the leaf springs 16 and 17 is One end portion of the movable electrode plate 23, which is set to be disposed close to and facing the fixed electrode plate 22, is fixed with a screw. The fixed electrode plate 22 and the movable electrode plate 23 are set apart from each other by a certain distance, and if the gap width between the two electrode plates 22 and 23 changes,
The device is configured to capture the amount of change as a change in capacitance, convert it into a frequency, and then perform arithmetic processing and convert it into grams to detect the weight of the food placed on the turntable. There is.

In the above configuration, when food is placed on a turntable (not shown) in a microwave oven, the turntable pivot 18, etc. that supports the turntable from below has two upper and lower plates that form a cantilever support structure. Since they are flexibly supported by the leaf springs 16 and 17, the leaf springs 16 and 17 flex and deform using the leaf spring mounting member 15 as a fulcrum depending on the weight of the food. As a result, the support member 24 on the free end side is
The movable electrode plate 23, which has one end attached to the electrode, moves downward, and the gap width between the electrode plates 22 and 23 increases. At this time, the capacitance changes by the amount of change in the gap width between the two electrode plates 22 and 23, and by converting the amount of change into a frequency and calculating it to convert it into grams, it is possible to The weight of the food is detected.

In the turntable drive mechanism unit with the weight detection function, the overall height of the unit is significantly reduced (height h). And the oven bottom plate 2 of the above unit.
5, attach the housing 14 of the unit to the mounting bracket 26 spot welded to the outer surface of the oven bottom plate 25 using the screws 2 from the unit side.
This is being held on July 27th. Also, the turntable pivot insertion portion 25a of the oven bottom plate 25
A cheese yoke 28 for preventing leakage of radio waves from the oven bottom plate 25 is formed of an oven bottom plate 25 and a mounting fitting 26 spot-welded to the oven bottom plate 25.

Therefore, the turntable drive mechanism unit with weight detection function is compact and easy to handle, and when it is installed on the oven bottom plate, the screws are tightened from the unit side, making installation work easier.Furthermore, the installation screws are not exposed inside the oven. Improves cleaning performance.

<Effects> The present invention relates to a movable electrode that moves downward due to the movement of the turntable axis in the thrust direction for detecting the weight of food as capacitance, and the movement of the turntable axis in the thrust direction. In the turntable drive mechanism mounting device with a weight detection function, the turntable drive mechanism is equipped with a fixed electrode without a bracket, and a turntable drive mechanism that rotates the turntable shaft inserted through the turntable shaft insertion portion of the oven bottom plate. A mounting bracket having one end that forms a yoke together with the oven bottom plate to prevent radio wave leakage from the turntable pivot insertion portion of the oven bottom plate is fixed to the other end of the mounting bracket. Two leaf springs are attached to the leaf spring mounting member so that they face each other vertically, and one end of each of the leaf springs is supported in a cantilever manner, and a turntable pivot is attached to the free end of the two leaf springs. A support member provided with a turntable bearing that rotatably supports the is provided, one end of the fixed electrode is attached to the leaf spring mounting member and positioned between the two leaf springs, and the support member is mounted on the support member. , one end of the movable electrode is attached, and the movable electrode is placed close to and facing the fixed electrode, and the turntable drive mechanism is attached to a portion of the support member on the opposite side of the movable electrode across the turntable pivot; The above-mentioned leaf spring mounting member, leaf spring, turntable bearing, support member, fixed electrode, movable electrode, and turntable drive mechanism are made into a unit and are fixedly attached to the above-mentioned mounting bracket, so that the fixed electrode and the movable electrode are connected to two pieces. It is placed between the leaf springs, allowing the overall height of the device to be significantly lowered, saving space, and protecting the fixed and movable electrodes with the leaf springs. Therefore, it is possible to reliably prevent direct impacts and other external factors from being applied to the fixed and movable electrodes during transportation and handling, and the gap width between the fixed and movable electrodes can be reduced to an initial value. It is possible to prevent the gap width from changing and perform accurate weight detection.

Furthermore, by simply attaching the turntable drive mechanism with a weight detection function to the oven bottom plate, the turntable pivot can be attached to the turntable bearing at the same time.

Furthermore, even if food is placed on the turntable and the turntable pivot moves in the thrust direction, the turntable drive mechanism also moves at the same time as this movement, causing unnecessary force to be applied to the turntable drive mechanism. Therefore, the driving force of the turntable drive mechanism can be transmitted to the turntable pivot shaft without waste, and the turntable can be rotated smoothly.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part showing an embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view of a main part showing a conventional example. Code, 13...Turntable drive mechanism, 25
...Oven bottom plate, 26...Mounting bracket, 27...
Screw, 28...Chiyoke.

Claims (1)

[Claim for Utility Model Registration] A movable electrode that moves downward due to movement of a turntable axis in the thrust direction for detecting the weight of food as capacitance, and movement of the turntable axis in the thrust direction. In the turntable drive mechanism mounting device with a weight detection function, which is provided with a fixed electrode unrelated to the above, and a turntable drive mechanism that rotates the turntable shaft inserted through the turntable shaft insertion portion of the oven bottom plate, A mounting bracket having one end that forms, together with the oven bottom plate, a yoke for preventing radio wave leakage from the turntable pivot insertion portion of the oven bottom plate is fixed to the oven bottom plate, and fixed to the other end of the mounting bracket. Two leaf springs are vertically opposed to each other, and one end of each leaf spring is supported by a cantilever, and a turntable is attached to the free end of the two leaf springs. a support member provided with a turntable bearing that rotatably supports the pivot shaft; one end of the fixed electrode is attached to the leaf spring mounting member and positioned between the two leaf springs; One end of the movable electrode is attached to the member, and the movable electrode is disposed close to and facing the fixed electrode, and the turntable drive mechanism is mounted on the opposite side of the movable electrode across the turntable pivot of the support member. A turntable with a weight detection function, characterized in that the above-mentioned leaf spring mounting member, leaf spring, turntable bearing, support member, fixed electrode, movable electrode, and turntable drive mechanism are formed into a unit and fixed to the above-mentioned mounting bracket. Drive mechanism mounting device.