JPS6144326A - Load detector of load-cell type electronic scale - Google Patents
Load detector of load-cell type electronic scaleInfo
- Publication number
- JPS6144326A JPS6144326A JP16615284A JP16615284A JPS6144326A JP S6144326 A JPS6144326 A JP S6144326A JP 16615284 A JP16615284 A JP 16615284A JP 16615284 A JP16615284 A JP 16615284A JP S6144326 A JPS6144326 A JP S6144326A
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- load
- adjustment
- bridge circuit
- load cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Measurement Of Force In General (AREA)
Abstract
Description
【発明の詳細な説明】
（ａ楽土の利用分野）
本発明は、ロードセル式電子秤の荷重検出装置に関する
。Detailed Description of the Invention (a) Field of Application of Rakudo The present invention relates to a load detection device for a load cell type electronic scale.
（従来技術）
第３図は、従来のロードセル式電子秤の荷重検出装置の
例で、図に示すようにロードセルの起歪体１における引
張受感部Ｔと、圧ｌｉｌ受感部Ｃの各々に左右対称とな
るように４枚の歪ゲージ２を貼すイ１け、これを第５図
に示すようなブリッジ回路３の各辺に配置して、偏荷重
に起因する起歪体１のモーメント荷重を打消したり、ｌ
！廣変化による誤差を補償させる機能を持たせていた。(Prior Art) Fig. 3 shows an example of a load detection device for a conventional load cell type electronic scale. Attach four strain gauges 2 symmetrically to each side of the bridge circuit 3 as shown in Figure 5. Cancel the moment load, l
! It had a function to compensate for errors caused by wide changes.
またブリッジ回路３の１辺には、歪ゲージ個々の抵抗値
の差異によって不平衡出力が生ずるので、これを補償す
るため不平衡補償用抵抗ｒが接続される。また、起歪体
１は温度が上昇するとヤング率が低下するため、回じ荷
重値が加わっても歪が大きくなって出力が増すようにな
る。これを補償するためヤング率補償用抵抗Ｒ８が接続
される。またＲ。Furthermore, an unbalance compensation resistor r is connected to one side of the bridge circuit 3 to compensate for an unbalanced output caused by differences in resistance values of the individual strain gauges. Furthermore, as the temperature of the strain-generating body 1 increases, the Young's modulus decreases, so even if a rotational load value is applied, the strain increases and the output increases. To compensate for this, a Young's modulus compensating resistor R8 is connected. R again.
は差動増幅器の分圧抵抗、ＲｆはフィードバックＪＪＬ
抗、Ｒ２＋ Ｒ１！ 、Ｒ４は差動＃１幅器の入力レ
ベルを一定値以下に押さえるためのバイアス抵抗で、初
Ｊｆｔ＋荷重（秤Ｍｆｆｌのｆｆｉ量）から各抵抗値を
決定している。ＶＲは初期荷重のバラツキを補正するた
めの零点調整用抵抗、Ｖｅｘは印加電圧である、差動増
幅器４の出力側からは被計量物の！ＩＩ量信呼信号られ
る。is the voltage dividing resistance of the differential amplifier, Rf is the feedback JJL
Anti, R2+ R1! , R4 is a bias resistor for holding the input level of the differential #1 amplifier below a certain value, and each resistance value is determined from the initial Jft+load (the amount of ffi of the scale Mffl). VR is a zero point adjustment resistor for correcting variations in initial load, and Vex is an applied voltage. II volume is signaled.
（従来技術の問題点）
このように、従来のロードセル式電子秤の荷重検出装置
においては、各歪ゲージの抵抗値のバラツキを補償して
ブリッジをバランスさせるために補償抵抗ｒを挿入する
必要があるが、その抵抗（ａの算出や半田付けは人手で
行なわなければならないので作業能率が極めて悪く、一
定の精度を維持するためには高度の熟練と技能が要求さ
れた。(Problems with the Prior Art) As described above, in the conventional load detection device of the load cell type electronic scale, it is necessary to insert a compensation resistor r in order to compensate for the variation in the resistance value of each strain gauge and balance the bridge. However, the calculation of resistance (a) and soldering had to be done manually, resulting in extremely low work efficiency, and a high level of skill and skill was required to maintain a certain level of accuracy.
また、演算増幅器４の出力側に接続されるＡ／Ｄ変換器
の使用可能領域を確保する必要から、バイアス抵抗（Ｒ
２、Ｒｇ 、Ｒ４）で初期荷重（秤量皿の重量）による
出力を一定値以下に押さえていたが、初期荷重が大きく
変わる場合（例えば。In addition, since it is necessary to secure a usable area for the A/D converter connected to the output side of the operational amplifier 4, a bias resistor (R
2, Rg, R4), the output due to the initial load (weight of the weighing pan) was kept below a certain value, but if the initial load changes significantly (for example.
同一規格の演算増幅器基板を秤量の異なる各種の秤に使
用する場合）は、初期荷重に応じてバイアス抵抗をそれ
ぞれ変えなければならないので、バイアス抵抗を幾種類
も用意しなければならず、この点においてもコストアッ
プの要因となっていた更に、従来はロードセルと演ユ１
！３幅器とを別個独立に考え、ロードセル側５と＠算増
幅器が取付けられている基板０１１６でそれぞれのＷ”
Ｊも各々独立して行なっていたので、調整作業がｇ１復
するという問題があった。When using an operational amplifier board of the same standard for various scales with different weighing capacities, the bias resistor must be changed depending on the initial load, so multiple types of bias resistors must be prepared. Furthermore, in the past, load cells and
! Considering the 3-width amplifier separately and independently, each W"
Since J was also performed independently, there was a problem in that the adjustment work was repeated G1.
（ＪＡＶＡの目的）
本発明の目的は、ブリー、ジ回路のバランス調整と演算
増幅器の入力側で行なっている秤としての零点調整とを
、演算増幅器が取付けられる基板側６で一体に行なえる
ようにして、調整作業の簡略化を図るとノ（に１部品点
数が少なくても、十分な測定精度が得られる、ロードセ
ル式電子秤の荷重検出装置を提供することにある。(Object of JAVA) The object of the present invention is to enable the balance adjustment of the breech circuit and the zero point adjustment as a scale, which is performed on the input side of the operational amplifier, to be performed integrally on the board side 6 where the operational amplifier is installed. Another object of the present invention is to provide a load detection device for a load cell type electronic scale that can obtain sufficient measurement accuracy even if the number of parts is small in order to simplify the adjustment work.
（発明の概要）
本発明のロードセル式電子秤の荷重検出装置は演算増幅
器に分圧抵抗、調整抵抗及びフィードバック抵抗を接続
し、ロードセルの起歪体に所定個数配置した歪ゲージと
、前記分圧抵抗及びｍ整抵抗でブリッジ回路を形成し、
ａ＊ｔｗａ抵抗でブリッジ回路のバランス調整と、秤と
しての零点ｙＪｌｌを同時に行なうものである。(Summary of the Invention) A load detection device for a load cell type electronic scale of the present invention includes a voltage dividing resistor, an adjustment resistor, and a feedback resistor connected to an operational amplifier, and a strain gauge arranged in a predetermined number on a strain body of the load cell, and Form a bridge circuit with the resistor and the m-registered resistor,
The a*twa resistor simultaneously adjusts the balance of the bridge circuit and sets the zero point yJll as a scale.
（χ施例）
以下、図により本発明の一実施例について説明する。第
１図は、第４図（ａ）のように、ロードセルの起歪体ｌ
における引張受感部Ｔと圧縮受感部Ｃに２枚の歪ゲージ
２を貼り付けた例に１本発明の構成を適用した回路図で
ある０図のように、本発明においては、ロードセル側５
には、２枚の歪ゲージＧｔ、Ｇｃとヤング率補償用抵抗
Ｒ０のみを配置し、演算増幅器４が取付けられている基
板側６には演算増幅器４の分圧抵抗Ｒａ 、 Ｒｂ 。(X Example) Hereinafter, an example of the present invention will be described with reference to the drawings. Figure 1 shows the load cell's strain body l as shown in Figure 4 (a).
As shown in Figure 0, which is a circuit diagram in which the configuration of the present invention is applied to an example in which two strain gauges 2 are attached to the tension sensitive part T and the compression sensitive part C, in the present invention, the load cell side 5
, only two strain gauges Gt, Gc and a resistor R0 for Young's modulus compensation are arranged, and voltage dividing resistors Ra, Rb of the operational amplifier 4 are placed on the substrate side 6 where the operational amplifier 4 is attached.
Ｒｅと調整抵抗Ｖｒ、及びフィードバック抵抗Ｒｆを配
置している。第２図は第１図のブリッジ回路構成図で、
ブリッジ回路の２辺には歪ゲージＧｃ、ＯＬを挿入し、
他の２辺には分圧抵抗Ｒａ。Re, an adjustment resistor Vr, and a feedback resistor Rf are arranged. Figure 2 is the bridge circuit configuration diagram of Figure 1.
Insert strain gauges Gc and OL into the two sides of the bridge circuit,
There is a voltage dividing resistor Ra on the other two sides.
Ｒｂ 、Ｒｃと調整抵抗Ｖｒとを挿入している。即ち、
本発明においては、ブリッジ回路のバランスＸｇｌ！Ｉ
と演算Ｍ：ｉ幅器４の入力側で行なう秤としての零点１
Ｉ１１整とを、演算増幅器４が取付けられる基板側６に
配置した＠算増幅器４の調整抵抗Ｖｒで同時に行うよう
になっているのでロードセル側５での調整が不要となり
、調整作業が簡単になると共に部品点数も減少できる。Rb, Rc and an adjustment resistor Vr are inserted. That is,
In the present invention, the bridge circuit balance Xgl! I
and operation M: i Zero point 1 as a scale performed on the input side of the scale unit 4
Since the adjustment of I11 and I11 are performed simultaneously by the adjustment resistor Vr of the @arithmetic amplifier 4 placed on the board side 6 where the operational amplifier 4 is attached, adjustment on the load cell side 5 is not required, making the adjustment work easier. At the same time, the number of parts can also be reduced.
尚、分圧抵抗Ｒｃは省略することができる。また、秤量
を変える場合は前立増幅器のフィードバック抵抗Ｒｆを
変えるだけでスパンのＪＪＭが簡単に行なえる。Note that the voltage dividing resistor Rc can be omitted. Furthermore, when changing the weight, span JJM can be easily performed by simply changing the feedback resistance Rf of the preamplifier.
また、第１図、第２図の例ではロードセル側５にヤング
率補償用の抵抗Ｒ０を配置しているが、起歪体のヤング
率を補償し得る特性を有する歪ゲージを用いた場合には
、このヤング率補償用抵抗Ｒｏは不要となる。尚、第４
図（ｂ）のように歪ゲージの貼り付は位置を変えた場合
は、第６図のようなブリッジ回路を構成すれば良い、こ
の場合も歪ゲージのブリッジ回路への挿入位置が異なる
のみで、基本的には、動作原理は！７Ｓ４図（ａ）の場
合と同様である。In addition, in the examples shown in FIGS. 1 and 2, a resistor R0 for Young's modulus compensation is placed on the load cell side 5, but if a strain gauge with a characteristic capable of compensating for the Young's modulus of the flexure element is used, In this case, this Young's modulus compensation resistor Ro becomes unnecessary. Furthermore, the fourth
If you change the position of the strain gauges as shown in Figure (b), you can configure a bridge circuit as shown in Figure 6. In this case, the only difference is the insertion position of the strain gauges into the bridge circuit. , Basically, the working principle is! This is the same as in the case of 7S4 figure (a).
尚、以上の説明では２枚ゲージを中心として説’７１し
たが、これに限定されるものではなく、２枚以上のゲー
ジを使用する場合も同様に適用し得るものである。In the above explanation, the theory '71 has been centered around a two-piece gauge, but the invention is not limited to this, and can be similarly applied to the case where two or more gauges are used.
（発明の効果）
以上説明したように、本発明のロードセル式電予科の荷
重検出装置は、演コ増輻器を取付ける基板側に設けた。(Effects of the Invention) As explained above, the load detection device for the load cell type electric preparatory section of the present invention is provided on the board side on which the power amplifier is mounted.
演算増幅器の分圧抵抗及びｙＡ整低抵抗、歪ゲージと共
にブリッジ回路をｕＪ或しているので、部品点数を低減
でき、更に、ブリ、ジ回路のバランス！Ｉ！Ｉ！にと演
算増幅器の入力側で行なっていた＃ｆとしての零点調整
を、ｒＡ算増幅器の基板側のｍ整抵抗で同時に行なえ、
ロードセル側での！Ｉｉｌ！１が不要となって調整作業
が簡単になるという利点がある。Since the bridge circuit is used together with the voltage dividing resistor of the operational amplifier, the yA rectifying resistor, and the strain gauge, the number of parts can be reduced, and the bridge and bridge circuits are balanced! I! I! Now, the zero point adjustment as #f, which was done on the input side of the operational amplifier, can be done simultaneously with the m adjustment resistor on the board side of the rA operational amplifier.
On the load cell side! Iil! This has the advantage that adjustment work is simplified since step 1 is not required.
第１図、第２図は、本発明の回路図、第３図、第４図（
ａ）、（ｂ）は歪ゲージ取付けの説明図、第５図は従来
例の回路図、第６図は、本発明の他の実施例の回路図で
ある。
ｌ・・・起歪体、２・・・歪ゲージ、３・・・ブリッジ
回路、４・・・演算増幅器、Ｒａ、Ｒｂ、Ｒｅ・・・分
圧抵抗、Ｖｒ・・・調整抵抗、Ｒｆ・・・フィードバッ
ク抵抗。
特許出願人 株式会社 石田衡器製作所代 理 人
弁理士 辻 實（外１名）第３図
第４図
（ａ）（６つ
第５図
第６図Figures 1 and 2 are circuit diagrams of the present invention, Figures 3 and 4 (
FIG. 5 is a circuit diagram of a conventional example, and FIG. 6 is a circuit diagram of another embodiment of the present invention. l... Strain body, 2... Strain gauge, 3... Bridge circuit, 4... Operational amplifier, Ra, Rb, Re... Voltage dividing resistor, Vr... Adjustment resistor, Rf. ...Feedback resistance. Patent applicant: Representative of Ishida Koki Seisakusho Co., Ltd.
Patent attorney Minoru Tsuji (1 other person) Figure 3 Figure 4 (a) (6 figures Figure 5 Figure 6
Claims (1)
抗を接続し、ロードセルの起歪体に所定個数の歪ゲージ
を配置し、この歪ゲージと前記分圧抵抗及び調整抵抗で
ブリッジ回路を構成し、該調整抵抗でブリッジ回路のバ
ランス調整と、秤としての零点調整を同時に行なうこと
を特徴とするロードセル式電子秤の荷重検出装置。A voltage dividing resistor, an adjusting resistor, and a feedback resistor are connected to the operational amplifier, a predetermined number of strain gauges are arranged on the strain body of the load cell, and a bridge circuit is configured with this strain gauge, the voltage dividing resistor, and the adjusting resistor, and A load detection device for a load cell type electronic scale, which uses an adjustment resistor to simultaneously adjust the balance of a bridge circuit and adjust the zero point of the scale.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16615284A JPS6144326A (en) | 1984-08-08 | 1984-08-08 | Load detector of load-cell type electronic scale |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16615284A JPS6144326A (en) | 1984-08-08 | 1984-08-08 | Load detector of load-cell type electronic scale |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6144326A true JPS6144326A (en) | 1986-03-04 |
Family
ID=15826023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16615284A Pending JPS6144326A (en) | 1984-08-08 | 1984-08-08 | Load detector of load-cell type electronic scale |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6144326A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6358218A (en) * | 1986-08-29 | 1988-03-14 | Ishida Scales Mfg Co Ltd | Load detecting circuit |
| EP0299806A2 (en) * | 1987-07-16 | 1989-01-18 | Ishida Scales Mfg. Co. Ltd. | Weighing device employing strain gauges |
| JP2008180671A (en) * | 2007-01-26 | 2008-08-07 | Matsushita Electric Ind Co Ltd | Dynamic quantity sensor |
-
1984
- 1984-08-08 JP JP16615284A patent/JPS6144326A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6358218A (en) * | 1986-08-29 | 1988-03-14 | Ishida Scales Mfg Co Ltd | Load detecting circuit |
| EP0299806A2 (en) * | 1987-07-16 | 1989-01-18 | Ishida Scales Mfg. Co. Ltd. | Weighing device employing strain gauges |
| JP2008180671A (en) * | 2007-01-26 | 2008-08-07 | Matsushita Electric Ind Co Ltd | Dynamic quantity sensor |
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