JPH0124573Y2 - - Google Patents
Info
- Publication number
- JPH0124573Y2 JPH0124573Y2 JP19743583U JP19743583U JPH0124573Y2 JP H0124573 Y2 JPH0124573 Y2 JP H0124573Y2 JP 19743583 U JP19743583 U JP 19743583U JP 19743583 U JP19743583 U JP 19743583U JP H0124573 Y2 JPH0124573 Y2 JP H0124573Y2
- Authority
- JP
- Japan
- Prior art keywords
- displacement
- lever
- stopper
- load
- weighing pan
- 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.)
- Expired
Links
- 238000006073 displacement reaction Methods 0.000 claims description 54
- 238000005303 weighing Methods 0.000 claims description 24
- 230000007246 mechanism Effects 0.000 claims description 23
- 230000005540 biological transmission Effects 0.000 claims description 4
- 230000033001 locomotion Effects 0.000 claims description 4
- 230000036316 preload Effects 0.000 claims description 4
- 230000001105 regulatory effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 description 22
- 101150006573 PAN1 gene Proteins 0.000 description 10
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
Landscapes
- Measurement Of Force In General (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Description
【考案の詳細な説明】
(イ) 産業上の利用分野
本考案は電磁力平衡型の天びんの過負荷保護機
構に関する。[Detailed description of the invention] (a) Industrial application field The present invention relates to an overload protection mechanism for an electromagnetic balance type balance.
(ロ) 従来の技術
一般の電子天びんや電子はかりでは、秤皿・皿
受部と、ケース（又はベース）のいずれか、ある
いは両方にストツパを設け、過負荷が作用したと
きにはこのストツパが働いて秤皿上の荷重が受感
部に伝わらず、ケース（又はベース）に伝わるよ
う構成された方式の過負荷保護機構が多い。しか
し、電磁力平衡型の天びんではその構成上、単に
上述の如きストツパによる過負荷保護機構を用い
ることはできない。(b) Prior art In general electronic balances and electronic scales, a stopper is provided on the weighing pan/pan holder, the case (or base), or both, and this stopper is activated when an overload occurs. There are many overload protection mechanisms that are configured so that the load on the weighing pan is transmitted to the case (or base) rather than to the sensing part. However, due to the structure of an electromagnetic balance type balance, it is not possible to simply use the above-mentioned overload protection mechanism using a stopper.
すなわち、電磁力平衡型の天びんは、その機構
の例を第１図に示す如く、秤皿１上の荷重により
変位されるロバーバル機構２に、荷重伝達用レバ
ー３の荷重点３ａを係合し、そのレバー３の変位
検出端３ｂの変位を光源４とフオトセル５からな
る非接触変位センサによつて検出してその値が零
となるよう、電磁力発生部６によりレバー３に加
える電磁力を制御する。変位検出端３ｂ近傍に
は、第２図にその要部拡大斜視図を示す如く、フ
オトセル５の受光範囲によつて決定される位置に
ストツパ７を配設し、変位が制御範囲を越えない
よう規制している。従つて、レバー３の変位検出
端３ｂの可動範囲はこれにより制限を受け、更に
通常、レバー３のメカニカルアドバンテージを大
きくとるので、秤皿１の変位はその数分の１乃至
数百分の１程度と極めて少いストロークでしか動
くことができず、これを単にストツパによつて規
制して過負荷保護機構とすることは困難である。
また、偏荷重により秤皿１が傾くと、上述の少な
いストロークとの兼ね合いでストツパの作動荷重
が著し変動する。なお第１図に示す例では、レバ
ー３を２段組合わせ構造を用いているが、１段の
場合も全く同様である。 That is, in an electromagnetic balance type balance, as shown in FIG. 1, a load point 3a of a load transmission lever 3 is engaged with a roberbal mechanism 2 that is displaced by a load on a weighing pan 1. , the electromagnetic force applied to the lever 3 by the electromagnetic force generator 6 is detected so that the displacement of the displacement detection end 3b of the lever 3 is detected by a non-contact displacement sensor consisting of a light source 4 and a photocell 5, and the value becomes zero. Control. A stopper 7 is disposed near the displacement detection end 3b at a position determined by the light receiving range of the photocell 5, as shown in an enlarged perspective view of the main part in FIG. 2, to prevent the displacement from exceeding the control range. It is regulated. Therefore, the movable range of the displacement detection end 3b of the lever 3 is limited by this, and since the mechanical advantage of the lever 3 is usually large, the displacement of the weighing pan 1 is from a few to a few hundredths of that amount. It is difficult to simply restrict this movement with a stopper and use it as an overload protection mechanism.
Further, when the weighing plate 1 is tilted due to an unbalanced load, the operating load of the stopper fluctuates significantly due to the above-mentioned small stroke. In the example shown in FIG. 1, the lever 3 has a two-stage combination structure, but the same applies to a one-stage combination structure.
従来、このような電磁力平衡型の天びんにおい
て秤皿、皿受等の変位をストツパで規制する過負
荷保護機構を設ける為に、秤皿１とロバーバル機
構２の間に平行ばねを設けて偏荷重による秤皿１
の傾きを防止するとともに、負荷による変位を大
きくしたり、過負荷が作用したときに秤皿１等の
変位を通常より大きくする機構、例えばある荷重
を越える荷重が作用したときに秤皿１の変位が顕
著に大きくなるようばね定数が不連続的に減少す
るばね機構を設けていた。その為、秤皿１を支持
する皿受部の形状が複雑になり、部品点数の増加
及び調整工数の増加を余儀なくされている。 Conventionally, in such an electromagnetic balance type balance, in order to provide an overload protection mechanism that restricts the displacement of the weighing pan, pan holder, etc. with a stopper, a parallel spring is provided between the weighing pan 1 and the roberval mechanism 2 to prevent bias. Weighing pan by load 1
A mechanism that prevents the scale from tilting and also increases the displacement due to load or makes the displacement of the weighing pan 1 larger than normal when an overload is applied, for example, when a load exceeding a certain load is applied. A spring mechanism was provided in which the spring constant decreased discontinuously so that the displacement became significantly large. As a result, the shape of the plate holder that supports the weighing plate 1 becomes complicated, forcing an increase in the number of parts and the number of adjustment steps.
(ハ) 目的
本考案は上記に鑑みてなされたもので、構造が
簡単で容易に調整することができ、しかも偏荷重
による秤皿の傾きがあつても作動荷重にバラツキ
を生ずることなく、常に安定して作動することの
できる電磁力平衡天びんの過負荷保護機構の提供
を目的としている。(C) Purpose The present invention was developed in view of the above, and has a simple structure and can be easily adjusted.Moreover, even if the weighing pan is tilted due to unbalanced load, the operating load will not vary, and the The purpose is to provide an overload protection mechanism for electromagnetic balance balances that can operate stably.
(ニ) 構成
本考案の特徴とするところは、荷重伝達用レバ
ーの変位検出端に、その変位量が電磁力による制
御範囲を越えないよう配設されるストツパを、変
位検出端の変位方向に対して弾性的に可動とし、
秤皿上の荷重が所定値を越えたとき、秤皿等の変
位が大きくなるよう構成するとともに、平行運動
機構の変位端若しくは荷重伝達用レバーの荷重点
に当接してその変位を規制するようなストツパを
設けたことにある。(D) Structure The feature of the present invention is that a stopper is provided at the displacement detection end of the load transmission lever so that the amount of displacement does not exceed the control range by electromagnetic force, in the direction of displacement of the displacement detection end. It is elastically movable against the
When the load on the weighing pan exceeds a predetermined value, the weighing pan, etc. is constructed so that the displacement increases, and the displacement is regulated by coming into contact with the displacement end of the parallel motion mechanism or the load point of the load transmission lever. This is due to the provision of a stopper.
(ホ) 実施例
本考案実施例を、以下、図面に基づいて説明す
る。(e) Embodiments Embodiments of the present invention will be described below based on the drawings.
第３図は本考案実施例の機構図であり、第４図
はその変位検出端近傍の拡大図である。なお、第
１図に示す機構図と同一の部分は同一の番号を符
してその説明を省略する。特徴部分は、第１図に
おいてレバー３の変位検出端３ｂに対するストツ
パ７に替えて、変位検出端３ｂの変位方向に対し
て弾性的に可動の第１のストツパ１０を設けたこ
とと、ロバーバル機構２の変位端２ａの下方に所
定距離をあけて第２のストツパ２０を設けた点に
ある。 FIG. 3 is a mechanical diagram of an embodiment of the present invention, and FIG. 4 is an enlarged view of the vicinity of the displacement detection end. Note that the same parts as in the mechanical diagram shown in FIG. 1 are denoted by the same numbers, and the explanation thereof will be omitted. The characteristic parts are that, in place of the stopper 7 for the displacement detection end 3b of the lever 3 in FIG. 1, a first stopper 10 that is elastically movable in the direction of displacement of the displacement detection end 3b is provided, and The second stopper 20 is provided at a predetermined distance below the second displacement end 2a.
第１のストツパ１０は、変位検出端３ｂの変位
が制御範囲を越えたときに当接する接触子１１
と、一端がベース等のハウジング要素に固定さ
れ、他端が接触子１１を変位検出端３ｂ側に押圧
する圧縮コイルばね１２、およびその圧縮コイル
ばね１２を収容し、かつ、接触子１１が変位検出
端３ｂの制御範囲内に入り込まないようその位置
を規制するガイド１３から構成されている。圧縮
コイルばね１２は、当該天びんの定格荷重が秤皿
１に作用したときに、変位検出端３ｂに加わる力
Ｆに等しい予荷重が加えられた状態でガイド１３
内に挿入されている。従つて、秤皿１上に定格荷
重以上の荷重が作用しない限り、例え変位検出端
３ｂが接触子１１に当接しても、接触子１１は変
位せず変位検出端３ｂが制御範囲を逸脱すること
はない。 The first stopper 10 has a contact 11 that comes into contact when the displacement of the displacement detection end 3b exceeds the control range.
and a compression coil spring 12 whose one end is fixed to a housing element such as a base, and whose other end presses the contact 11 toward the displacement detection end 3b, and which accommodates the compression coil spring 12 and whose other end presses the contact 11 toward the displacement detection end 3b. It is composed of a guide 13 that restricts the position of the detection end 3b so that it does not enter the control range of the detection end 3b. The compression coil spring 12 is connected to the guide 13 in a state where a preload equal to the force F applied to the displacement detection end 3b is applied when the rated load of the balance is applied to the weighing pan 1.
inserted inside. Therefore, unless a load greater than the rated load is applied to the weighing pan 1, even if the displacement detection end 3b comes into contact with the contact 11, the contact 11 will not be displaced and the displacement detection end 3b will deviate from the control range. Never.
以上の本考案実施例において、秤皿１上に定格
荷重を越える力が作用したとき、変位検出端３ｂ
にはＦを越える力が作用して接触子１１に当接
し、接触子１１を圧縮コイルばね１２の押圧力に
抗して変位させる。従つてこの場合変位検出端３
ｂは制御範囲を越えることになり、ロバーバル機
構２の変位端２ａは従来の固定されたストツパを
設けた場合よりも大きく変位する。故に、第２の
ストツパ２０をロバーバル機構２の変位端２ａか
ら充分大きな距離を隔てて設け、これを過負荷保
護用のストツパとすることができる。また、過負
荷保護用ストツパたる第２のストツパ２０をロバ
ーバル機構２の変位端２ａに当接させるよう構成
しているので、偏荷重による秤皿１の傾きやたわ
み等は保護機構の作動荷重に影響を与えない。な
お、第２のストツパ２０を当接させる点は、ロバ
ーバル機構２の変位端２ａでもよいし、あるいは
レバー３の荷重点３ａであつても同様であり、ま
た、これらの箇所にねじ等の調節可能なストツパ
を設け、これをベース等に当接させるよう構成し
てもよい。 In the above embodiment of the present invention, when a force exceeding the rated load is applied on the weighing pan 1, the displacement detection end 3b
A force exceeding F acts on the contactor 11 and causes the contactor 11 to be displaced against the pressing force of the compression coil spring 12. Therefore, in this case, the displacement detection end 3
b exceeds the control range, and the displacement end 2a of the roberval mechanism 2 is displaced more than when a conventional fixed stopper is provided. Therefore, the second stopper 20 can be provided at a sufficiently large distance from the displacement end 2a of the roberval mechanism 2, and can be used as a stopper for overload protection. In addition, since the second stopper 20, which serves as an overload protection stopper, is configured to abut against the displacement end 2a of the Roberval mechanism 2, the tilting or deflection of the weighing pan 1 due to unbalanced loads will be affected by the operating load of the protection mechanism. No impact. The point to which the second stopper 20 comes into contact may be the displacement end 2a of the roberval mechanism 2 or the load point 3a of the lever 3. A possible stopper may be provided and configured to abut against the base or the like.
秤皿１上の過負荷が除去されると、圧縮コイル
ばね１２の復元力により変位検出端３ｂはすみや
かに制御範囲内に復帰する。 When the overload on the weighing pan 1 is removed, the displacement detection end 3b quickly returns to within the control range due to the restoring force of the compression coil spring 12.
上述の第１のストツパとして、第５図又は第６
図のような板ばねを用いた構造を採用することが
できる。第５図の実施例は、リン青銅等の板ばね
ね１４に、上述した力Ｆに相当する予荷重をコ字
形部材１５によつて与えたもので、第６図では同
様な板ばね１４′にねじ１５′によつて力Ｆに相当
する予荷重を与えている。これらによつても上述
した第１の実施例と同等の作用・効果を得ること
ができる。 5 or 6 as the first stopper described above.
A structure using a leaf spring as shown in the figure can be adopted. In the embodiment shown in FIG. 5, a preload corresponding to the above-mentioned force F is applied to a leaf spring 14 made of phosphor bronze or the like by means of a U-shaped member 15. In the embodiment shown in FIG. A preload corresponding to the force F is applied by means of the screw 15'. With these, it is possible to obtain the same functions and effects as those of the first embodiment described above.
(ヘ) 効果
以上説明したように、本考案によれば、従来の
電磁力平衡型の天びんの過負荷保護装置のように
秤皿１や皿受部分に各種の機構を用いる必要がな
く、機構が極めて簡単となる。また、過負荷保護
用ストツパ（第２のストツパ２０）とロバーバル
機構２の変位端２ａ若しくはレバー３の荷重点３
ａとの間隔を、レバー３の変位量が大きくなる分
だけ大きくとることができ、取付、調整が容易と
なる。また、第２のストツパ２０の作動荷重が秤
皿１の傾斜に影響を受けず、偏荷重等によるバラ
ツキが生じない。更に、第１のストツパ１０に弾
性体を用いているので、衝撃荷重等に対する緩衝
機能を持たせることができるとともに、過負荷除
去後にすみやかに変位検出端３ｂが制御範囲内に
戻り、直ちに平衡点に達することができる。(f) Effects As explained above, according to the present invention, there is no need to use various mechanisms on the weighing pan 1 or the pan holder, unlike in conventional overload protection devices for balances with electromagnetic force. becomes extremely simple. In addition, the overload protection stopper (second stopper 20) and the displacement end 2a of the roberval mechanism 2 or the load point 3 of the lever 3
The distance between the lever 3 and the lever 3 can be increased by the amount of displacement of the lever 3, which facilitates installation and adjustment. In addition, the operating load of the second stopper 20 is not affected by the inclination of the weighing plate 1, and variations due to unbalanced loads and the like do not occur. Furthermore, since an elastic body is used for the first stopper 10, it can have a buffering function against impact loads, etc., and the displacement detection end 3b quickly returns to within the control range after the overload is removed, and the equilibrium point is immediately reached. can be reached.
第１図は電磁力平衡型天びんの機構例、第２図
はその変位検出端３ｂ近傍の拡大斜視図、第３図
は本考案実施例の全体機構図、第４図はその変位
検出端３ｂ近傍の拡大図、第５図および第６図は
本考案の他の実施例の変位検出端３ｂ近傍を示す
図である。
１……秤皿、２……ロバーバル機構、２ａ……
変位端、３……レバー、３ａ……荷重点、３ｂ…
…変位検出端、５……フオトセル、６……電磁力
発生部、１０……第１のストツパ、１１……接触
子、１２……圧縮コイルばね、１３……ガイド、
１４，１４′……板ばね。
Fig. 1 is an example of the mechanism of an electromagnetic balance type balance, Fig. 2 is an enlarged perspective view of the vicinity of the displacement detecting end 3b, Fig. 3 is an overall mechanical diagram of the embodiment of the present invention, and Fig. 4 is the displacement detecting end 3b thereof. The enlarged views of the vicinity, FIGS. 5 and 6, are diagrams showing the vicinity of the displacement detection end 3b of other embodiments of the present invention. 1... Weighing plate, 2... Roberval mechanism, 2a...
Displacement end, 3... Lever, 3a... Load point, 3b...
... Displacement detection end, 5 ... Photo cell, 6 ... Electromagnetic force generating section, 10 ... First stopper, 11 ... Contactor, 12 ... Compression coil spring, 13 ... Guide,
14, 14'... leaf spring.
Claims (1)
変位端に、荷重伝達用レバーの一端を係合し、
そのレバーの他端の変位が零となるよう当該レ
バーに電磁力を作用させ、その電磁力の大きさ
から上記秤皿上の荷重を測定する天びんにおい
て、上記レバーの他端の変位を規制してその変
位量が上記電磁力による制御範囲を越えないよ
う配設された第１のストツパを、上記レバーの
他端の変位方向に弾性的に可動なるよう構成す
るとともに、上記秤皿上の荷重が所定値を越え
たとき上記平行運動機構の変位端若しくは上記
レバーの一端に当接してその変位を規制するよ
う第２のストツパを設けたことを特徴とする電
子天びんの過負荷保護機構。 (2) 上記第１のストツパが、一端が固定された弾
性体と、当該電子天びんの定格荷重が上記秤皿
に作用したときに上記レバーの他端に作用する
力で上記弾性体の他端に予荷重を与える規制体
とを備えていることを特徴とする実用新案登録
請求の範囲第１項記載の電子天びんの過負荷保
護装置。[Claims for Utility Model Registration] (1) One end of a load transmission lever is engaged with a displacement end of a parallel motion mechanism that is displaced by a load on a weighing pan;
In a balance that applies an electromagnetic force to the lever so that the displacement of the other end of the lever becomes zero, and measures the load on the weighing pan from the magnitude of the electromagnetic force, the displacement of the other end of the lever is regulated. The first stopper is arranged so that the amount of displacement thereof does not exceed the range controlled by the electromagnetic force, and is configured to be elastically movable in the direction of displacement of the other end of the lever, and the first stopper is arranged so that the amount of displacement thereof does not exceed the control range by the electromagnetic force. An overload protection mechanism for an electronic balance, characterized in that a second stopper is provided so as to come into contact with the displacement end of the parallel movement mechanism or one end of the lever to restrict displacement when the displacement exceeds a predetermined value. (2) The first stopper has an elastic body fixed at one end, and the other end of the elastic body is actuated by the force acting on the other end of the lever when the rated load of the electronic balance acts on the weighing pan. An overload protection device for an electronic balance according to claim 1, further comprising a regulating body that applies a preload to the balance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19743583U JPS60104729U (en) | 1983-12-21 | 1983-12-21 | Overload protection mechanism for electronic balances |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19743583U JPS60104729U (en) | 1983-12-21 | 1983-12-21 | Overload protection mechanism for electronic balances |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60104729U JPS60104729U (en) | 1985-07-17 |
| JPH0124573Y2 true JPH0124573Y2 (en) | 1989-07-25 |
Family
ID=30755732
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19743583U Granted JPS60104729U (en) | 1983-12-21 | 1983-12-21 | Overload protection mechanism for electronic balances |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60104729U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018115919A (en) * | 2017-01-17 | 2018-07-26 | 大和製衡株式会社 | Electromagnetic balance type weight sensor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2634543A1 (en) * | 2012-02-29 | 2013-09-04 | Mettler-Toledo AG | Weighing cell operating on the principle of magnetic power compensation with optoelectronic position sensor |
-
1983
- 1983-12-21 JP JP19743583U patent/JPS60104729U/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2018115919A (en) * | 2017-01-17 | 2018-07-26 | 大和製衡株式会社 | Electromagnetic balance type weight sensor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60104729U (en) | 1985-07-17 |
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