JPH11125428A - Weight sensor fixing device for microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of malfunction by a method wherein a supporting bracket is connected to a turn table driving means through incomplete threads so as to permit vertical free play upon the delivery of a product so that the shock and vibration of the turn table driving means are not transmitted to the supporting bracket and the initial characteristics of a weight detecting means are not changed. SOLUTION: When shock and vibration are impressed and straining stress is generated in a turn table driving means 40 upon the delivery of a product under a condition that a supporting bracket 52 is assembled so as to permit free play, the straining stress will not be transmitted to the supporting bracket 52 and is absorbed by incomplete threads 57. Accordingly, the supporting bracket 52 is protected from the shock and vibration whereby an initial characteristic (value of electrostatic capacity) with respect to a predetermined distance L2, set between the fixed electrode plate 54 and a movable electrode plate 56, which are clamped to the supporting bracket 52, will not be fluctuated and the generation of malfunction of a weight detecting means can be prevented.

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 capacitance, and more particularly, to an improvement in a structure for fixing weight sensing means fixed to a lower portion of a turntable driving unit. And a weight sensor fixing device for a microwave oven.

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 indicates the capacitance, ε indicates 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 of the bipolar plate and the dielectric constant ε, and is inversely proportional to the distance d of the bipolar plate. This is a method of detecting the weight of an object by changing d and causing the capacitance C to change.

[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 plate which is screwed between the outer surface of the bottom surface of the zero and the fixed electrode plate 54 so as to resilient vertically in response to the load transmitted through the shaft 20 while maintaining the predetermined distances L1 and L2. 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.

The plurality of screws 51 have a helical surface 51a such that one end thereof passes through the through hole 52b of the support bracket 52 and is connected to the screw hole 42 of the turntable driving means 40. On the other side, the support bracket 52 is connected to the turntable driving means 4 by a fastening force.
The head 51 is in close contact with the lower surface of the support bracket 52 so as to be strongly pressed and fixed to the forming part 41 of the support bracket 52.
b is formed.

[0008]

However, according to the conventional weight sensor fixing device for a microwave oven configured as described above, the fixed electrode plate and the movable electrode plate fastened to the upper surface of the support bracket of the weight sensing means. Has a structure in which the front and rear ends of the support bracket are fastened to the outside of the bottom surface of the turntable driving means using a plurality of screws so as to maintain the predetermined distances L3 and L1 from the turntable driving means, respectively. Since the support bracket is fastened to the turntable drive means for mass production of the product, it is firmly assembled with a plurality of screws so that it does not move, so the turntable drive during product shipment (product distribution process) The shock and vibration generated by the means are directly transmitted to the support bracket, so that the fixed electrode plate 54 and the movable electrode plate 56 As a result, a predetermined stress L2 is generated between the fixed electrode plate 54 and the movable electrode plate 56, or a predetermined distance L2 is set between the movable electrode plate 56 and the bottom surface of the turntable driving means 40. When the initial characteristics (capacitance value) for the distance L1 change arbitrarily, there is a problem that the malfunction of the weight sensing means 50 is induced.

[0009]

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:
The support bracket of the weight sensing means is movably assembled to the turntable driving means to prevent the shock and vibration of the turntable driving means from being transmitted to the support bracket at the time of product shipment, thereby distorting the fixed electrode plate and the movable electrode plate. Another object of the present invention is to provide a weight sensor fixing device for a microwave oven which prevents not only the initial characteristics from being generated by preventing the generation of a force due to the above-mentioned factors but also the malfunction of the weight sensing means.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, a microwave oven weight sensor fixing device 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. Thus, in a weight sensor fixing device of a microwave oven, wherein a support bracket is coupled to the outside of the bottom surface of the turntable driving means so as to detect a weight of an object by causing a change in capacitance, the support bracket is a product In order to prevent the impact and vibration of the turntable driving means from being transmitted at the time of shipment, the turntable driving means is allowed to freely move in the vertical direction so that a plurality of Characterized in that it is coupled by a screw.

[0011] Further, a weight sensing means comprising a fixed electrode plate and a movable electrode plate which are coupled to the upper surface of the support bracket at a predetermined distance from each other, and the weight of an object placed on a turntable is moved through an axis by the 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. A weight sensor fixing device for a microwave oven coupled to the outside of a bottom surface of the turntable driving means, wherein the support bracket is movably coupled to the outside of the bottom surface of the turntable driving means at a certain distance; In addition to preventing the noise caused by the movement of the support bracket,
And a plurality of cushion members interposed between the turntable driving means and the support bracket so as to maintain the support bracket in parallel.

[0012]

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 to 6. 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 support bracket 52 and 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.
A vertical direction corresponding to a load transmitted through the shaft 20 while maintaining a predetermined distance L2 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 support bracket 52; Movable plate 5 coupled via a second screw 55 so as to resiliently act
6 and a plurality of incomplete screws 57 used to movably couple the support bracket 52 to the outside of the bottom surface of the turntable driving means 40.

At this time, the turntable driving means 40
Forming portions 41 are formed on four bottom surfaces of the support bracket 52 so that the movable electrode plate 56 maintains a predetermined distance L4 when the support brackets 52 are in close contact with each other. The screw hole 42 is formed so that the incomplete screw 57 penetrating the four portions of the edge portion is fastened to connect the turntable driving means 40 and the support bracket 52, and the bottom surface of the screw hole 42 is formed on one side. When the shaft 20 descends, the shaft hole 43 is formed so as to be placed on the upper surface of the movable electrode plate 56 while being penetrated.

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 portion 41 of the turntable driving means 40, and the incomplete portions are formed at four places at both ends of the convex surface 52a. A screw hole 42 formed in the forming portion 41 through a screw 57
A plurality of through-holes 52b are formed so as to be connected to each other.

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.
e is drilled.

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.

A plurality of second screws 55 penetrating the movable electrode plate 56 while being mounted on the convex surface 52a of the support bracket 52 are provided in the diagonal directions of the left and right ends of the movable electrode plate 56. 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.

At one end of the plurality of incomplete screws 57,
A spiral surface 57a is formed so as to penetrate through the through hole 52b of the support bracket 52 and be connected to the screw hole 42 of the turntable driving means 40, and the other side has a through hole of the support bracket 52 at the time of fastening. The head 57 is attached to the lower surface of the support bracket 52 without passing through the head 52b.
b is formed between the spiral surface 57a and the head portion 57b.
2b, a washer function portion 57c is integrally formed with the forming portion 41 of the turntable driving means 40 so that the support bracket 52 is movably supported by the turntable driving means 40 while being pressed and coupled to the forming portion 41 of the turntable driving means 40. ing.

At this time, the washer function portion 57c is formed to have a predetermined outer diameter smaller than the inner diameter of the through hole 52b of the support bracket 52 and to have an outer diameter larger than the outer diameter of the spiral surface 57a. .

In the figure, reference numeral 70 denotes a non-metallic 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, a concave surface 52d formed at the center of the support bracket 52
The fixed electrode plate 54 is placed thereon, and two first screw holes 52c formed on the left and right sides of the concave surface 52d are aligned with the first through holes 54a formed on the left and right sides of the fixed electrode plate 54. After that, the assembly with the support bracket 52 and the fixed electrode plate 54 is completed by tightening using the first screw 53.

Further, the movable electrode plate 56 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 movable electrode plate 56 After aligning the two second through holes 56a formed in the left and right diagonal directions, the assembly with the support bracket 52 and the movable electrode plate 56 is completed by tightening using the second screw 55.

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 L2 with the fixed electrode plate 54 fastened within the concave surface 52d.

When the assembly of the fixed electrode plate 54 and the movable electrode plate 56 on the support bracket 52 is completed, the convex surface 52a of the support bracket 52 is formed at four locations on the bottom surface of the turntable driving means 40 so as to protrude outward. 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 part 41, a plurality of holes are formed in the lower portion of the support bracket 52. The assembly of the support bracket 52 and the turntable driving means 40 is completed using the incomplete screw 57.

That is, when the spiral surface 57a of the plurality of incomplete screws 57 is inserted through the through hole 52b of the support bracket 52 and tightened in one direction, the spiral surface 57a passes through the through hole 52b with sufficient space to drive the turntable. Screw hole 4 drilled in forming part 41 of means 40
2, the washer function portion 57c formed in the middle of the imperfect screw 57 is also tightly attached to the outer surface of the forming portion 41 while passing through the through hole 52b with a margin.

At this time, since the thickness of the washer functional portion 57c is larger than the thickness of the through hole 52b, even if the support bracket 52 is assembled on the bottom surface of the turntable driving means 40 by the imperfect screw 57, the movable electrode plate is formed. In addition to forming the predetermined distance L4 without the upper surface of the 56 being in contact with the forming portion 41, the upper surface 56 can float even when the support bracket 52 is fastened.

As described above, when impact and vibration are applied to the turntable driving means 40 at the time of shipment of a product in a state where the support bracket 52 is movably assembled and strain stress is generated, the strain stress is transmitted to the support bracket 52. Instead, it is absorbed by the incomplete screw 57.

Therefore, since the support bracket 52 is protected from shock and vibration, the initial characteristic (static) for a predetermined distance L2 set between the fixed electrode plate 54 and the movable electrode plate 56 fastened to the support bracket 52 is obtained. (Capacitance value) is not changed, and the malfunction of the weight sensing means 50 can be prevented.

As described above, an example of a weight sensor fixing device of a microwave oven using incomplete screws 57 at four locations so that the support bracket 52 is coupled to the outside of the bottom surface of the turntable driving means 40 will be described. However, the present invention is not limited to this. For example, as shown in FIGS. 7 to 9 in the second embodiment, two portions of the support bracket 52 in the diagonal direction are connected by the incomplete screw 57, At two locations in the diagonal direction of the dust, a cushion member 60 is interposed between the support bracket 52 and the turntable driving means 40 to prevent the floating noise caused by the floating movement of the support bracket 52 and to reduce the noise of the support bracket 52. It is configured to be kept parallel.

At this time, the plurality of cushion members 60
Can be fixed to one side of the upper surface of the support bracket 52 with an adhesive therebetween, or
Even if it is fixed to the outside of the bottom surface of the turntable driving means 40 corresponding to the second predetermined position via an adhesive, it is included in the concept of the present invention.

[0032]

As described above, according to the weight sensor fixing device of the microwave oven according to the present invention, a plurality of incomplete screws are used when fastening the support bracket of the weight sensing means to the outside of the bottom surface of the turntable driving means. In this way, the support bracket can be assembled so as to be freely movable, so that the shock and vibration of the turntable driving means can be prevented from being transmitted to the support bracket when the product is shipped, and the fixed electrode plate and the movable electrode plate can be fixed. In addition to preventing the occurrence of deformation due to strain stress or the like so that the initial characteristics do not change, there is an excellent effect that the malfunction of the weight sensing means can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing the structure of a conventional weight sensor fixing device.

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 first embodiment of the present invention.

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

6 is a sectional view taken along line AA of FIG.

FIG. 7 is an exploded perspective view illustrating a weight sensing unit according to a second embodiment of the present invention.

FIG. 8 is a bottom view showing the connected state of FIG. 7;

FIG. 9 is a sectional view taken along line BB of FIG. 8;

[Explanation of symbols]

 Reference Signs List 20 shaft 30 turntable 40 turntable driving means 41 forming part 42 screw hole 50 weight sensing means 52 support bracket 52a convex surface 52b through hole 54 fixed electrode plate 56 movable electrode plate 57 imperfect screw 57a spiral surface 57b head 57c washer function portion 60 Cushion member

Claims (7)

[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. A weight sensor fixing device for a microwave oven coupled to a bottom surface of the microwave oven, wherein the support bracket is movable vertically in the turntable driving means so that shocks and vibrations of the turntable driving means are not transmitted when the product is shipped. A weight sensor fixing device for a microwave oven, wherein the weight sensor fixing device is connected by a plurality of imperfect screws. 2. The turntable driving means according to claim 1, wherein the support bracket is positioned between the plurality of incomplete screws when the incomplete screws pass through one side of the support bracket and are fastened to a forming portion of the turntable driving means. 2. The fixing device according to claim 1, wherein a washer function portion having a thickness larger than a thickness of the support bracket is integrally formed so as to be assembled so as not to contact the driving means. 3. The washer function portion is formed to have a predetermined outer diameter smaller than the inner diameter of the through hole so as to pass through a through hole formed in the support bracket and be pressed against a turntable driving means. 3. The microwave oven weight sensor fixing device according to claim 2, wherein the outer diameter is formed to be larger than the outer diameter of the spiral surface of the incomplete screw. 4. A weight sensing means comprising a fixed electrode plate and a movable electrode plate which are coupled to the upper surface of the 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. A weight sensor fixing device for a microwave oven coupled to the outside of the bottom surface of the turntable, wherein the support bracket is movably coupled to the outside of the bottom surface of the turntable driving means at a certain distance; The turntable driving means and the support bracket are arranged to prevent the noise caused by the movement of the support bracket and to keep the support bracket parallel. Weight sensor fixing apparatus of a microwave oven, characterized in that it comprises a plurality of cushion members, a interposed between the bets. 5. The fixing device according to claim 4, wherein the plurality of incomplete screws and the plurality of cushion members are respectively installed in opposite diagonal directions. 6. The weight sensor fixing device for a microwave oven according to claim 4, wherein the plurality of cushion members are respectively fixed to one side of an upper surface of the support bracket with an adhesive interposed therebetween. 7. The plurality of cushion members are respectively fixed to the outside of the bottom surface of the turntable driving means corresponding to a predetermined position of the support bracket via an adhesive. 6. The weight sensor fixing device for a microwave oven according to item 5.