JP2848822B1 - Microwave oven weight sensor tuning device - Google Patents

Abstract

A tuning groove is formed in the center of a support bracket to accurately inform a punching position of a punch during a tuning operation, and a bending deformation easily occurs even in a weak punching to reduce an initial capacitance value. Provided is a weight sensor tuning device for a microwave oven, which is easily adjusted in a short time and prevents a failure of a weight sensing means due to damage of a support bracket due to excessive punching. In the center of the plane of a support bracket (52), a punching position of a punch (P) is determined at the time of a tuning operation, and a fixed electrode plate (54) is movable while being easily deformed at the time of punching. A tuning groove 58 is formed so that the initial capacitance value can be easily adjusted by changing the distance from the electrode plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weight sensor for a microwave oven using a capacitance, and more particularly, to an initial static state in which weight sensing means is fixed below a turntable driving unit during mass production of products. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weight sensor tuning device for a microwave oven that tunes a capacitance value.

Here, a sensing method using capacitance is as follows.
The weight of the object can be obtained by the mathematical expression C = εA / d. In the above formula, C is the capacitance, ε is the dielectric constant, A
Indicates the area of the bipolar plate, and d indicates the distance between the bipolar plates.

That is, the capacitance C is proportional to the area A and the dielectric constant ε of the bipolar plate, and is inversely proportional to the distance d between the bipolar plates. Distance d
This is a method of detecting the weight of an object by changing the capacitance C to change the capacitance.

[0004]

2. Description of the Related Art Generally, as shown in FIGS. 1 to 3, an object (eg, food or drink) required for cooking is placed on a bottom surface of a cooking chamber 10 via a shaft 20 so as to be placed thereon. A turntable 30 installed at a fixed height, turntable driving means 40 installed outside the bottom surface of the cooking chamber 10 so as to drive the shaft 20 so that the turntable 30 rotates and moves up and down; Weight sensing means 50 installed on the outside of the bottom surface of the turntable driving means 40 so as to contact the shaft 20 so as to transmit the weight of the object placed on the shaft 30 through the shaft 20 and sense the weight; It is composed of

Here, the weight sensing means 50 is provided with a plurality of screws 51 outside the bottom surface of the turntable driving means 40.
A fixed electrode plate 54 screwed to the center of the upper surface of the support bracket 52 before the support bracket 52 is joined, and the turntable at the center of the upper surface of the support bracket 52. Drive means 4
The movable electrode which is screwed between the outer surface of the bottom surface of the base plate 0 and the fixed electrode plate 54 so as to resilient in the vertical direction with the load transmitted through the shaft 20 while maintaining the predetermined distances L and L ', respectively. And a plate 56.

At this time, both ends of the front and rear convex surfaces 52a of the support bracket 52 are aligned with screw holes 42 of a forming part 41 formed at four positions on the bottom surface of the turntable driving means 40, respectively. Through holes 52b are formed so as to be fastened via the screws 51.

[0007]

By the way, as shown in FIG. 3, the conventional weight sensor tuning apparatus for a microwave oven configured as described above has a fixed electrode plate and a movable electrode plate of weight sensing means at the time of mass production of products. When tuning the initial capacitance value with respect to the distance from the support bracket, the capacitance value displayed on a monitor (not shown) is checked while vertically hitting the unspecified position of the support bracket several times with a punch. However, such a tuning device cannot punch the center portion of the support bracket accurately, so that the capacitance value cannot be accurately adjusted within a short time, and
There has been a problem in that the support bracket is severely deformed due to excessive punching force, thereby increasing the failure rate of the weight sensing means.

[0008]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-mentioned various problems, and an object of the present invention is to provide:
A tuning groove is formed in the center of the support bracket to accurately indicate the punching position of the punch during tuning work, and easily deform even when weak punching is performed, and the initial capacitance value can be easily set in a short time It is an object of the present invention to provide a weight sensor tuning device for a microwave oven which is adjusted to prevent a failure of a weight sensing means due to damage of a support bracket due to excessive punching.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, a weight sensor tuning apparatus for a microwave oven according to the present invention comprises a fixed electrode coupled to a top surface of a support bracket at a predetermined distance from each other. Weight sensing means comprising a plate and a movable electrode plate, and when the weight of the object placed on the turntable is transmitted to the movable electrode plate via a shaft, the distance between the movable electrode plate and the fixed electrode plate varies. The weight sensor tuning fixing device of the microwave oven, in which the support bracket is coupled to the outside of the bottom surface of the turntable driving means so as to detect the weight of the object by causing a change in capacitance, the flat surface of the support bracket In the center, the punching position of the punch is determined at the time of tuning work, and bending deformation easily occurs during punching. By pressing the fixed electrode plate being characterized in that the tuning grooves are formed so as to vary the distance between the fixed electrode plate and the movable electrode plate easily adjust the initial capacitance value.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below in detail with reference to the accompanying drawings. Hereinafter, a first embodiment according to the present invention will be described in detail with reference to the accompanying drawings 4 and 5. Incidentally, in the drawings, the same parts as those of the conventional configuration are denoted by the same names and reference numerals, and the detailed description attached thereto is omitted.

The weight sensing means 50 according to the present invention comprises a plurality of screws 51 on the outside of the bottom surface of the turntable driving means 40.
A fixed electrode plate 54 connected to the center of the upper surface of the support bracket 52 through a plurality of first screws 53;
Is interposed between the outer surface of the bottom surface of the turntable driving means 40 and the fixed electrode plate 54 at the center of the upper surface of the turntable, and is resilient in a vertical direction due to the load transmitted through the shaft 20 while maintaining a predetermined distance L ' And a movable electrode plate 56 connected via a second screw 55 as described above.

At this time, the turntable driving means 40
Forming portions 41 are formed at four locations on the bottom surface of the support member 52 so that the movable electrode plate 56 maintains a constant interval when the support bracket 52 is in close contact.
A screw hole 42 is drilled at the center of 1 so that the screw 51 penetrating through four portions of the edge of the support bracket 52 is fastened to connect the turntable driving means 40 and the support bracket 52. On one side of the bottom surface, a shaft hole 43 is formed so that the shaft 20 is placed on the upper surface of the movable electrode plate 56 while penetrating when the shaft 20 descends.

At the front and rear ends of the support bracket 52, convex surfaces 52a are formed so as to be in close contact with the forming portions 41 of the turntable driving means 40, and the screws 51 are provided at four positions on both ends of the convex surface 52a. Are formed and a plurality of through-holes 52b are drilled so as to be connected to the screw holes 42 formed in the forming portion 41.

At the center of the support bracket 52, the fixed electrode plate 54 is
A concave surface 52d having first screw holes 52c is bent at two places on the left and right so that a first screw 53 passing therethrough is coupled, and the movable electrode plate 56 is placed on one end of the convex surface 52a. Second screw holes 52 are provided at two locations in the left and right diagonal directions so that second screws 55 passing through the movable electrode plate 56 are coupled.
In the center of the concave surface 52d, the punching position of the punch P is determined at the time of tuning work, and the initial capacitance value is easily adjusted by easily bending the weak punching. An H-shaped tuning groove 58 is formed by cutting so that it can be formed.

On the other hand, at the left and right ends of the fixed electrode plate 54,
The first screws 53 that pass through the fixed electrode plate 54 while being placed on the concave surface 52d of the support bracket 52 are connected to the first screw holes 52c of the support bracket 52, respectively.
A first through-hole 54a is formed at a location, and the first through-hole 54a is formed.
One of a is in contact with a circuit portion 54b coated on the fixed electrode plate 54 so that the voltage applied to the fixed electrode plate 54 flows to the movable electrode plate 56 through the support bracket 52.

In the diagonal direction of the left and right ends of the movable electrode plate 56, a plurality of second screws 55 penetrating through the movable electrode plate 56 while being mounted on the convex surface 52a of the support bracket 52 are provided. Two second through holes 56a are drilled at two places so as to be connected to the screw holes 52e, and the load of the shaft 20 is applied to the center of the movable electrode plate 56 in a diagonal direction inside the second through hole 56a. Slots 56b are missing at two locations so that they are easily repelled in the axial direction when transmitted.

In the figure, reference numeral 70 denotes a nonmetallic pressing plate interposed between the lower end of the shaft 20 and the upper surface of the movable electrode plate 56.

Next, the operation and effect of the embodiment of the present invention configured as described above will be described. FIG.
As shown in the figure, in order to assemble the disassembled weight sensing means 50 on the outside of the bottom surface of the turntable driving means 40,
First, the concave surface 52 formed at the center of the support bracket 52
d, the fixed electrode plate 54 is placed on the
After aligning the two first screw holes 52c formed on the left and right sides of the fixed electrode plate 54 with the first through holes 54a formed on the left and right sides of the fixed electrode plate 54, the first screw holes 53c are tightened using the first screws 53. The assembly of the support bracket 52 and the fixed electrode plate is completed.

Further, the movable electrode plate is placed on the convex surface 52a with respect to the upper surface of the support bracket 52, and two second screw holes 52e formed in the left and right diagonal directions of the convex surface 52a and the left and right of the movable electrode plate 56. After aligning the two second through holes 56a formed in the diagonal directions, the second screw 55
Then, the assembly of the support bracket 52 and the movable electrode plate 56 is completed.

At this time, when the movable electrode plate 56 is fastened to the upper surface of the support bracket 52, the movable electrode plate 56 is installed so as to automatically maintain a predetermined distance L 'with the fixed electrode plate 54 fastened in the concave surface 52d. .

When the fixed electrode plate 54 and the movable electrode plate 56 have been assembled on the support bracket 52, the convex surface 52a of the support bracket 52 is connected to the turntable driving means 40.
Forming portions 41 projecting outward at four locations on the bottom surface
After the four through holes 52b formed in the front and rear ends of the convex surface 52a are aligned with the screw holes 42 formed in the forming portion 41, the support bracket 52
A plurality of screws 51 at the bottom of the support bracket 52
The assembling of the turntable driving means 40 is completed.

On the other hand, if the tuning operation is to be performed while the weight sensing means 50 is assembled on the bottom surface of the turntable driving means 40, first, the tuning groove 58 formed in the support bracket 52 of the weight sensing means 50 is formed. After turning upward, the prepared punch P is positioned at the center of the tuning groove 58 and punched vertically as shown in FIG.

In this case, the support bracket 52 pushes the fixed electrode plate 54 while slightly bending downward in accordance with the bending deformation of the tuning groove 58,
When the fixed electrode plate 54 moves in the direction of the movable electrode plate 56, the distance L 'between the fixed electrode plate 54 and the movable electrode plate 56 changes.

At this time, the changed distance L 'between the fixed electrode plate 54 and the movable electrode plate 56 is displayed in frequency on a monitor (not shown), and the operator matches the initial capacitance value displayed on the monitor. The tuning operation is completed by adjusting the strength of the punch P to a position where the punch P is positioned.

As described above, if the tuning groove 58 is accurately punched, the entire support bracket 52 can be prevented from being damaged, and the weight sensing means 50 can be prevented from being defective.

[0026]

As described above, according to the weight sensor tuning apparatus for a microwave oven according to the present invention, since the tuning groove is formed in the center of the support bracket, the punching position of the punch can be accurately determined during the tuning operation. In addition, it can easily bend even weak punching, and easily adjust the initial capacitance value in a short time to prevent the failure of the weight sensing means due to the damage of the support bracket due to excessive punching. There is an excellent effect that it can be prevented before it happens.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing a conventional weight sensor installation structure.

FIG. 2 is an exploded perspective view showing a conventional weight sensing means.

FIG. 3 is a bottom view showing the connected state of FIG. 2;

FIG. 4 is an exploded perspective view showing a weight sensing unit according to the present invention;

FIG. 5 is a bottom view showing the connected state of FIG. 4;

[Explanation of symbols]

 Reference Signs List 20 shaft 30 turntable 40 turntable driving means 50 weight sensing means 52 support bracket 54 fixed electrode plate 56 movable electrode plate 58 tuning groove P punch

Claims (2)

(57) [Claims] 1. A weight sensing means comprising a fixed electrode plate and a movable electrode plate which are coupled to an upper surface of a support bracket at a predetermined distance from each other, and wherein the weight of an object placed on a turntable is moved through an axis. When transmitted to the electrode plate, the distance between the movable electrode plate and the fixed electrode plate is changed, so that the capacitance is changed and the support bracket is turned by the turntable driving means so as to detect the weight of the object. In the microwave oven weight sensor tuning fixing device coupled to the outside of the bottom surface, in the center of the plane of the support bracket, the punching position of the punch is determined at the time of tuning work, and the fixed electrode is easily bent and deformed at the time of punching. By pressing the plate, the initial capacitance value can be easily adjusted by changing the distance between the fixed electrode plate and the movable electrode plate. Weight sensor tuning apparatus of a microwave oven, characterized in that the tuning groove is formed so as. 2. The tuning apparatus according to claim 1, wherein the tuning groove is cut into an H shape.