JP4418075B2

JP4418075B2 - Built-in weight lifting device

Info

Publication number: JP4418075B2
Application number: JP2000031579A
Authority: JP
Inventors: 直人出雲; 栄一吉田
Original assignee: A&D Co Ltd
Current assignee: A&D Co Ltd
Priority date: 2000-02-09
Filing date: 2000-02-09
Publication date: 2010-02-17
Anticipated expiration: 2020-02-09
Also published as: JP2001221682A

Description

【０００１】
【発明の属する技術分野】
本発明は電子秤に好適な内蔵分銅の昇降装置に関する。
【０００２】
【従来の技術】
電磁平衡式の電子天秤等、高い計量精度を有する電子秤においてはその精度を保持するため、秤量装置内に校正用の分銅が内蔵され、この内蔵分銅を荷重測定機構に加除する内蔵分銅加除機構が設けられているものが多い。これによって装置使用者が適宜に、或いは一定量の温度変化等の物理量の変化により自動的に、内蔵分銅を用いて校正を行うようになっている。
【０００３】
この様な内蔵分銅を有する電子秤において、校正をより正確に行うためには内蔵分銅の質量は小さなものより、この電子秤の秤量（最大荷重）になるべく近い大きな質量を有していることが望ましい。しかし、秤量が一定値以上となると秤量に近い質量の内蔵分銅を搭載することは、電子秤全体の重量増加、或いは内蔵分銅加除機構の大型化等により事実上不可能である。このため例えば秤量が１０Ｋｇの電子秤の場合には５００ｇから１０００ｇ程度の質量の内蔵分銅が搭載されているのが一般的である。
【０００４】
【発明が解決しようとする課題】
内蔵分銅の昇降機構は各種提案されているが、何れの形式の機構においても、基本的には通常の計量作業時には内蔵分銅は上限位置に配置され、校正時に昇降機構により下降して、荷重伝達機構にその荷重が負荷されて校正が実施されるようになっている。
【０００５】
図４は従来の内蔵分銅昇降機構の一例を示す。
内蔵分銅５０が上限に配置された状態では、荷重測定作業に支障が生じないよう上限に位置する内蔵分銅の上部には係止部材５１が位置し、内蔵分銅５０を支える昇降機構の支持部５２と共に内蔵分銅５０を挟持し、内蔵分銅５０がこの上限において安定して位置するようになっている。また係止部材５１はこのような荷重測定時以外に、秤量装置を運搬する場合も考慮して、装置が傾いたり運搬時に振動しても、質量の大きい内蔵分銅５０が脱落しないよう頑丈に形成されている。
【０００６】
この構成において昇降機構のうち内蔵分銅５０を直接支持する支持部５２は、重量物である内蔵分銅５０の荷重を直接支持しながら昇降動作を行う。このため昇降作動を確実にする必要上、支持部５２の昇降動作を案内する案内部材５３を設け、この案内部材５３を摺動しながら昇降動作を行うよう構成されているものが多い。
【０００７】
しかし多数回繰り返される昇降動作に伴う摺動動作によって、摺動部に磨耗が生じ、支持部５２の昇降動作の円滑性が低下する傾向がある。
昇降機構は、内蔵分銅５０を上昇させる際にはモータＭの駆動力を用いて上昇させ、かつ下降時は内蔵分銅５０の自重により自然下降させるように構成されており、下降時においてはモータＭはこの自重による自然下降を制御するために使用されるようになっている。このため、前記摺動部に磨耗が生じると、特に内蔵分銅５０の下降時にその下降動作の円滑性が損なわれることになる。
【０００８】
次に、内蔵分銅不使用時について考察すると、係止部材５１を頑丈に形成しておくと、内蔵分銅５０が上限に位置し、かつ当該係止部材５１に内蔵分銅５０が当接することにより駆動源であるモータＭに大きな負荷がかかり、モータＭや減速ギヤ機構等が損傷する虞れが生じる。このため例えば係止部材５１の支持部分等に弾性を持たせる等の方法によって、係止部材５１に内蔵分銅５０が圧接してもこの弾性により圧接力を軽減してモータＭに対する負荷を減少させるよう考慮した装置も提供されている。しかし弾発力を小さくするとモータＭに対する負荷は減少するものの、内蔵分銅５０に対する支持力は弱くなるため内蔵分銅５０の脱落の可能性は高くなる。反対に弾発力を大きくすると内蔵分銅５０の脱落の可能性は低くなるものの、当然のことながらモータに対する負荷は大きくなる。このように従来の構成では内蔵分銅の脱落防止とモータを始めとする内蔵分銅昇降機構に対する負荷の減少とは二律背反の関係にあり、問題の根本的解決には至らなかった。
【０００９】
【課題を解決するための手段】
本発明は上記問題点に鑑み構成されたものであり、本発明の第１の手段は、内蔵分銅を載置して当該内蔵分銅を昇降させる支持部材と、この支持部材の昇降を案内する案内部材と、支持部材を昇降動作させるシーソー部材とを有し、シーソー部材の一端は連結手段により当該支持部材と連結し、かつシーソー部材の他端は当該シーソー部材を揺動動作させる駆動部と接続し、前記支持部材はシーソー部材の揺動動作に従動して昇降動作を行うよう構成することにより、支持部材の昇降動作を常時円滑に行えるよう構成したことを特徴とする内蔵分銅昇降装置である。
【００１０】
また本発明の第２の手段は、内蔵分銅を介して支持部材と対向する位置に係止部材が設けられ、当該係止部材は内蔵分銅昇降機構に負荷を加えない範囲の弾性をもって、上限に位置する当該内蔵分銅に当接するよう構成され、かつ係止部材に対してはストッパが近接配置され、当該ストッパによって係止部材の変位が規制されることにより上限位置の内蔵分銅を、内蔵分銅加除機構に負荷をかけることなく、然も確実に内蔵分銅の脱落を防止するよう構成した内蔵分銅昇降装置である。
【００１１】
【発明の実施の態様】
支持部材は内蔵分銅を直接支持する部材であって、この支持部材にはシーソー部材の一端が接続し、支点軸を中心として揺動動作するシーソー部材によって支持部材が昇降するようになっている。
【００１２】
シーソー部材の揺動動作は、シーソー部材の一端を上下動させる機構があれば可能である。上下動機構としては幾つか考えられるが、機構が簡素でかつ作動の確実性なことからカム機構が適当である。カム機構を用いる場合には、カム部材はこのシーソー部材の一端に接触し、かつこのカム部材を回転動作させる電動モータ等の駆動源が設けられる。
【００１３】
一方、大きな荷重の内蔵分銅を支持しながら昇降動作を確実に行わせるため、支持部材には昇降動作を案内する案内部材が設けられる。シーソー部材の一端と案内部材とは連結手段で連結されており、案内部材が下降するときに、下降動作が、内蔵分銅を含めた案内部材の重量による自然下降に加えて、シーソー部材端部の下降動作に従動するよう構成しておく。
【００１４】
また、シーソー部材には、当該シーソー部材が支持部材を下降方向に動作させる方向へ回動する際に、その回動動作を付勢するバネ材等の弾性部材を設けるようにしておく。経時的な磨耗により支持部材の下降動作の円滑性が低下しても、このバネ材の弾性を利用して支持部材の下降方向へのシーソー部材の回動動作を補助し、その支持部材の下降動作を前記連結手段を介してこのシーソー部材の回動動作に従動させることにより、昇降動作の円滑性を確保する。
【００１５】
一方内蔵分銅を介してこの支持部材と対向するように係止部材が配置され、かつ当該係止部材は昇降機構に大きな負荷が加わらない範囲の弾性を有する支持材により支持される。この係止部材に対してはストッパが突設形成され、係止部材は支持材の弾性が弱く設定されていてもその移動範囲がこのストッバにより規制される。すなわち、ストッパの突設位置を適切に設定することにより、弾性の弱い係止部材であっても、上限にある内蔵分銅が変位した時にこの内蔵分銅が支持部材から脱落する前に係止部材はストッパによりその動きが規制され、従って内蔵分銅の脱落は生じない。またストッパとしては係止部材に用いられる弾性体よりも強い弾性を有する弾性体によって形成することも可能である。
【００１６】
【実施例】
以下図面を参考に本発明の実施例を具体的に説明する。
先ず主として図１および図２を用いて内蔵分銅の昇降機構について説明し、続いて、主として図３を用いて係止部材及びストッパの構成について説明する。
【００１７】
図中符号１はシーソー部材であって、支持軸２を中心としてその両端が上下に揺動可能なよう構成され、所謂シーソー動作をするよう構成されている。シーソー部材１の一端１Ａ側にはシーソー部材１の駆動機構として、回転軸３に対してその中心が偏心して取り付けられた偏心カム（以下単に「カム」とする）４が設けられている。このカム４は前記回転軸３を介して電動モータ５によって回転駆動されるようになっている。６はこの回転軸３に設けられたカム回転制御用のディスクであって、当該ディスク６に形成された切り欠き６ａ、６ａをセンサ７（図２参照）が検知することによりカム４の回転位置を制御してシーソー部材の昇降動作を制御するよう構成されている。
【００１８】
符号８はコイルバネ等の弾性部材であって、シーソー部材１のカム接触側端部１Ａと、装置本体側（図示の場合は回転軸３の支持部材）との間に介在配置され、引っ張りバネとして当該シーソー部材１の端部１Ａを上昇方向（Ｘ₁側）に付勢している。
【００１９】
一方、シーソー部材１の他端部１Ｂには支持部材９が接続している。即ちシーソー部材１の他端１Ｂは支持部材９の裏面に位置し、かつ当支持部材９は当該シーソー部材１の他端１Ｂに対してビス１２などの連結手段により接続している。
【００２０】
支持部材９は図２に示すような円筒形状の内蔵分銅１０を支持するため、内蔵分銅受け部９ａ、９ｂとして、この内蔵分銅１０を係止するための凹所が内蔵分銅１０の軸心方向に対して対向位置するようそれぞれ形成されている。因みに図示の内蔵分銅１０は支持部材９による支持をより確実とするため、受け部９ａ、９ｂに当接する部分は他の部分よりも直径の小さな溝部が内蔵分銅１０の円周方向に形成された構成となっている。
【００２１】
１１Ａ、１１Ｂ、１１Ｃは鉛直方向に固設したガイド軸であって、支持部材９の軸受け部９Ａ、９Ｂ、９Ｃを挿通し、この支持部材９が鉛直方向に昇降するよう案内している。なお、支持部材９に昇降動作を行わせるシーソー部材１はその端部１Ｂが支持軸２を中心として円弧を描いて昇降するため、前記ビス１２は長穴等を介して両者を接続し、支持部材９の昇降時に両者の変位を許容するよう構成されている。因みにビス１２と挿通孔とが密着していなくても、支持部材９はガイド軸に沿って昇降するため、昇降時に支持部材９ががたつく等の問題は生じない。
【００２２】
一方、前記支持部材９の上部には内蔵分銅１０を介して係止部材１３が設けられている。
図３において、符号１３は係止部材を示す。なお図示の状態は支持部材９が上昇し内蔵分銅１０が上限に位置する状態を示している。係止部材１３には前記支持部材９と同様に内蔵分銅１０の受け部１３ａ（１３ｂ）が、支持部材９の受け部９ａ、９ｂと対向するよう、下向きに形成されている。
【００２３】
この係止部材は弾性を有する支持材１４により支持されている。支持材１４の弾性は内蔵分銅１０が上限に位置する際に、モータ５を始めとする内蔵分銅昇降機構に大きな負荷が生じない程度の強さに設定されている。１５は秤量装置を構成する筐体等に連設され、かつ係止部材１３に向かって突設されたストッパである。このストッパ１５は、当該ストッパ１５と内蔵分銅１０が上限位置にある時の係止部材１３との間に間隙Ｗが生じるよう形成されている。またこの間隙Ｗは、秤量装置の傾きや振動によって係止部材１３が支持材１４の弾性に逆らって上方に移動した際に、係止部材１３と支持部材９との間に位置する内蔵分銅１０が脱落しない範囲でストッパ１５の変位を許容するよう構成されている。
【００２４】
上記ストッパ１５はプラスチック或いはアルミダイキャスト等の金属材料からなる秤量装置の筐体の一部として構成されているが、このような構成の他、前記支持材１４よりも強い弾性を有する弾性体としてもよい。この場合、ストッパとしての弾性体は内蔵分銅１０の脱落が生じない範囲で係止部材１３の変位を許容する。なお、内蔵分銅１０が上限位置にある場合に、係止部材１３と弾性体であるストッパとの間には前記ストッパ１５の場合と同様に間隙Ｗを形成し、弾性体であるストッパの強い弾性が昇降機構に負荷を与えないよにしておく。ストッパが弾性体である場合には、秤量装置が強い揺れに会った場合等に、係止部材１３がストッパに衝突するように急激に変位しても、この変位をストッパの弾性体により吸収することができるため、係止部材１３や内蔵分銅１０に損傷が生じるおそれがない。
【００２５】
次に上記した装置の作動状態について説明する。
校正時にはモータ５によりカム４を回動させ、シーソー部材１の端部１ＡをＹ₁の位置からＸ₁の位置に上昇させる。これによりシーソー部材１の他端１Ｂと接続する支持部材９は載置している内蔵分銅１０の自重により、ガイド軸１１Ａ〜１１Ｃに沿ってＸ₂方向に鉛直に下降する。この場合、ガイド軸１１Ａ〜１１Ｃと軸受け９Ａ〜９Ｃとが磨耗する等して円滑に下降し難い場合でも、バネ８によりシーソー部材１の端部１ＡはＹ₁の位置からＸ₁の位置に上昇するよう付勢されており、かつ、シーソー部材１の他端１Ｂはビス１２等の連結手段により当該支持部材９に連結している。これにより他端１Ｂはバネ８の弾性によりＸ₂方向に強制的に下降させられ、かつこの下降に従動して支持部材９の下降動作は常時円滑に行われる。因みに支持部材９の上昇時にはシーソー部材１の端部１Ｂが支持部材９の裏面に常時当接するため、バネ８の有無に係わりなく円滑に上昇動作を行うことができる。
【００２６】
内蔵分銅１０が下降することにより、当該内蔵分銅１０は秤量装置の伝達部材１７に設けられている内蔵分銅受け部１６（図２参照）に係止され、その荷重は荷重伝達部材１７を介して電磁部等の荷重計測部に伝達され、秤量装置としての校正が実施される。
【００２７】
校正を終了したならば、手動或いは自動による指令信号によりモータ５が再度回転し、カム４の回転によりシーソー部材１の端部１ＡはＹ₁方向に下降し、これに対応してシーソー部材の他端１ＢはＹ₂方向に上昇する。内蔵分銅１０が上限に近づくと当該内蔵分銅１０は前記係止部材１３に当接し、上限において、昇降機構側の支持部材９と、弾性を有する支持部材１４により支持された係止部材１３とにより確実に挟持された状態で保持される。但し、前述のとおり支持材１４の弾性は昇降機構に損傷が生じない範囲で設定されているため、秤量装置の運搬中の振動や衝撃により、支持材１４の弾性に反して係止部材１３が支持部材９から離間しようとする場合が生じる。しかし間隙Ｗ以上の係止部材１３の変位はストッパ１５により規制されるため内蔵分銅１０の脱落等の問題が生じることはない。
【００２８】
【発明の効果】
以上、具体的に説明したように本発明によれば、支持部材と当該支持部材を昇降動作させるシーソー部材とは連結手段を介して接続されているため、シーソー部材の揺動動作に従動して支持部材が昇降し、特にシーソー部材に対して支持部材を下降させる方向にその作動を付勢する弾性体を設けることにより、支持部材の昇降を案内する部材との間に磨耗等が生じても、その昇降動作を常時円滑に保持することができる。
【００２９】
また、上昇位置にある内蔵分銅を係止する係止部材は、内蔵分銅昇降機構に損傷を生じない範囲の弾性をもって構成されているので、内蔵分銅が係止部材に当接しても昇降機構に負担がかかることがなく、しかもストッパにより係止部材の変位は制限されるため、内蔵分銅の脱落等の問題は生ぜず、内蔵分銅を確実に支持することが可能となる。
【図面の簡単な説明】
【図１】本発明の実施例を示す内蔵分銅昇降機構の斜視図である。
【図２】図１に示す機構の平面図である。
【図３】図２のＡ−Ａ線による断面図である。
【図４】従来の内蔵分銅昇降機構の概念図である。
【符号の説明】
１シーソー部材
１Ａ（シーソー部材の）昇降機構側端部
１Ｂ（シーソー部材の）支持部材接続側端部
３回転軸
４偏心カム
５モータ
８バネ
９支持部材
９ａ、９ｂ内蔵分銅係止部
１１Ａ、１１Ｂ、１１Ｃガイド軸
１３係止部材
１４（弾性を有する）支持材
１５ストッパ
１６内蔵分銅受け部
１７荷重伝達部材
Ｗ係止部材とストッパとの間隙[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a lifting device for a built-in weight suitable for an electronic balance.
[0002]
[Prior art]
In an electronic balance with high weighing accuracy, such as an electromagnetic balance type electronic balance, a calibration weight is built in the weighing device, and a built-in weight addition / removal mechanism that adds and removes this built-in weight to the load measurement mechanism. There are many that are provided. As a result, the apparatus user performs calibration using the built-in weight appropriately or automatically according to a change in physical quantity such as a certain amount of temperature change.
[0003]
In such an electronic balance having a built-in weight, in order to perform calibration more accurately, the weight of the built-in weight should have a large mass that is as close as possible to the weight (maximum load) of the electronic balance. desirable. However, when the weight exceeds a certain value, it is practically impossible to mount a built-in weight having a mass close to the weight due to an increase in the weight of the entire electronic balance or an increase in the size of the built-in weight removing mechanism. For this reason, for example, in the case of an electronic balance having a weight of 10 kg, a built-in weight having a mass of about 500 g to 1000 g is generally mounted.
[0004]
[Problems to be solved by the invention]
Various built-in weight raising / lowering mechanisms have been proposed, but in any type of mechanism, the built-in weight is basically placed at the upper limit during normal weighing work, and is lowered by the lifting mechanism during calibration to transfer the load. The load is applied to the mechanism and calibration is performed.
[0005]
FIG. 4 shows an example of a conventional built-in weight lifting mechanism.
In the state where the built-in weight 50 is arranged at the upper limit, the locking member 51 is positioned above the built-in weight located at the upper limit so as not to hinder the load measurement work, and the support portion 52 of the lifting mechanism that supports the built-in weight 50. At the same time, the internal weight 50 is sandwiched, and the internal weight 50 is stably positioned at this upper limit. In addition to the load measurement, the locking member 51 is also formed so as to prevent the built-in weight 50 having a large mass from dropping off even when the weighing device is transported, even if the device is tilted or vibrates during transport. Has been.
[0006]
In this configuration, the support portion 52 that directly supports the built-in weight 50 in the lifting mechanism performs the lifting operation while directly supporting the load of the built-in weight 50 that is a heavy object. For this reason, in order to ensure the raising / lowering operation, a guide member 53 for guiding the raising / lowering operation of the support portion 52 is provided, and many are configured to perform the raising / lowering operation while sliding the guide member 53.
[0007]
However, due to the sliding motion accompanying the lifting motion repeated many times, the sliding portion is worn, and the smoothness of the lifting motion of the support portion 52 tends to decrease.
The raising / lowering mechanism is configured to raise by using the driving force of the motor M when raising the built-in weight 50, and to be naturally lowered by the weight of the built-in weight 50 when lowered, and at the time of lowering, the motor M Is used to control the natural descent due to its own weight. For this reason, when the sliding portion is worn, the smoothness of the lowering operation is impaired particularly when the built-in weight 50 is lowered.
[0008]
Next, when the built-in weight is not used, when the locking member 51 is formed firmly, the built-in weight 50 is positioned at the upper limit, and the built-in weight 50 contacts the locking member 51 to drive. A large load is applied to the motor M as a source, and the motor M, the reduction gear mechanism, and the like may be damaged. For this reason, for example, even if the built-in weight 50 is pressed against the locking member 51 by a method such as giving elasticity to the support portion of the locking member 51, the pressure is reduced by this elasticity to reduce the load on the motor M. An apparatus that takes such considerations into account is also provided. However, if the elastic force is reduced, the load on the motor M is reduced, but the supporting force for the built-in weight 50 is weakened, so the possibility of the built-in weight 50 being dropped increases. On the contrary, if the elasticity is increased, the possibility of the built-in weight 50 falling off decreases, but naturally the load on the motor increases. Thus, in the conventional configuration, there is a trade-off between the prevention of falling off of the built-in weight and the reduction of the load on the built-in weight lifting mechanism including the motor, and the problem has not been solved fundamentally.
[0009]
[Means for Solving the Problems]
The present invention is configured in view of the above problems, and the first means of the present invention is a support member for placing a built-in weight and raising and lowering the built-in weight, and a guide for guiding the raising and lowering of the support member. And a seesaw member that moves the support member up and down, one end of the seesaw member is connected to the support member by a connecting means, and the other end of the seesaw member is connected to a drive unit that swings the seesaw member The built-in weight lifting and lowering device is characterized in that the support member is configured to perform the lifting and lowering operation in accordance with the swinging motion of the seesaw member, so that the lifting and lowering operation of the support member can be performed smoothly at all times. .
[0010]
According to the second means of the present invention, a locking member is provided at a position facing the support member via the built-in weight, and the locking member has an elasticity within a range in which no load is applied to the built-in weight lifting mechanism, and the upper limit. It is configured to abut against the built-in weight that is located, and a stopper is disposed close to the locking member, and the displacement of the locking member is regulated by the stopper, so that the built-in weight at the upper limit position can be added and removed. This is a built-in weight lifting / lowering device configured to reliably prevent the built-in weight from falling off without applying a load to the mechanism.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
The support member is a member that directly supports the built-in weight. One end of a seesaw member is connected to the support member, and the support member is moved up and down by a seesaw member that swings about a fulcrum shaft.
[0012]
The seesaw member can be swung with a mechanism that moves one end of the seesaw member up and down. There are several possible vertical movement mechanisms, but a cam mechanism is suitable because the mechanism is simple and reliable in operation. When the cam mechanism is used, the cam member is in contact with one end of the seesaw member, and a drive source such as an electric motor for rotating the cam member is provided.
[0013]
On the other hand, the support member is provided with a guide member for guiding the lifting / lowering operation in order to ensure the lifting / lowering operation while supporting the built-in weight with a large load. One end of the seesaw member and the guide member are connected by a connecting means, and when the guide member descends, the lowering operation is performed in addition to the natural descending due to the weight of the guide member including the built-in weight, and the end of the seesaw member. It is configured to follow the descending motion.
[0014]
Further, the seesaw member is provided with an elastic member such as a spring material that biases the turning operation when the seesaw member rotates in the direction in which the support member moves in the downward direction. Even if the smoothness of the lowering operation of the support member is reduced due to wear over time, the elasticity of the spring material is used to assist the rotation of the seesaw member in the lowering direction of the support member, and the support member is lowered. The smoothness of the ascending / descending operation is ensured by causing the operation to follow the rotating operation of the seesaw member via the connecting means.
[0015]
On the other hand, a locking member is disposed so as to face the support member via a built-in weight, and the locking member is supported by a support material having elasticity within a range in which a large load is not applied to the lifting mechanism. A stopper is protruded from the locking member, and the movement range of the locking member is restricted by the stover even if the elasticity of the support member is set weak. That is, by appropriately setting the protruding position of the stopper, even if the locking member is weak in elasticity, the locking member is moved before the built-in weight is removed from the support member when the built-in weight at the upper limit is displaced. The movement is restricted by the stopper, so that the built-in weight does not fall off. Further, the stopper can be formed of an elastic body having elasticity stronger than that of the elastic body used for the locking member.
[0016]
【Example】
Embodiments of the present invention will be specifically described below with reference to the drawings.
First, the built-in weight raising / lowering mechanism will be described mainly with reference to FIGS. 1 and 2, and then the structure of the locking member and stopper will be mainly described with reference to FIG.
[0017]
Reference numeral 1 in the figure denotes a seesaw member, which is configured so that both ends of the support shaft 2 can swing up and down, and so-called seesaw operation is performed. On the one end 1A side of the seesaw member 1, an eccentric cam (hereinafter simply referred to as "cam") 4 is provided as a drive mechanism for the seesaw member 1 with its center eccentrically attached to the rotary shaft 3. The cam 4 is adapted to thus be rotated to the electric motor 5 through the rotary shaft 3. Reference numeral 6 denotes a cam rotation control disk provided on the rotary shaft 3, and the rotational position of the cam 4 is detected by a sensor 7 (see FIG. 2) detecting notches 6a and 6a formed in the disk 6. Is controlled to control the lifting and lowering operation of the seesaw member.
[0018]
Reference numeral 8 denotes an elastic member such as a coil spring, which is disposed between the cam contact side end 1A of the seesaw member 1 and the apparatus main body side (the support member of the rotating shaft 3 in the case of illustration), and serves as a tension spring. the end 1A of the seesaw member 1 is urged in upward direction (X ₁ side).
[0019]
On the other hand, a support member 9 is connected to the other end 1 </ b> B of the seesaw member 1. That is, the other end 1B of the seesaw member 1 is located on the back surface of the support member 9, and the support member 9 is connected to the other end 1B of the seesaw member 1 by a connecting means such as a screw 12.
[0020]
The support member 9 for supporting the cylindrical shape of the incorporated weight 10, as shown in FIG. 2, the internal weight receiving portion 9a, as 9b, the recess for locking the internal weight 10 the axis of the incorporated weight 10 Each is formed so as to be opposed to the direction . Incidentally, in order to make the built-in weight 10 shown in the figure more reliably supported by the support member 9, the portion contacting the receiving portions 9 a, 9 b is formed with a groove having a smaller diameter than the other portions in the circumferential direction of the built-in weight 10 . It has a configuration .
[0021]
11A, 11B, and 11C are guide shafts fixed in the vertical direction, and are inserted through the bearing portions 9A, 9B, and 9C of the support member 9 to guide the support member 9 to move up and down in the vertical direction. The seesaw member 1 that causes the support member 9 to move up and down moves up and down with its end portion 1B drawing an arc around the support shaft 2, so that the screw 12 is supported by connecting the two through a long hole or the like. It is comprised so that the displacement of both may be accept | permitted when the member 9 raises / lowers. Incidentally, even if the screw 12 and the insertion hole are not in close contact with each other, the support member 9 moves up and down along the guide shaft, so that problems such as rattling of the support member 9 during lifting and lowering do not occur.
[0022]
On the other hand, a locking member 13 is provided above the support member 9 via a built-in weight 10.
In FIG. 3, reference numeral 13 denotes a locking member. The illustrated state shows a state in which the support member 9 is raised and the built-in weight 10 is located at the upper limit. Similarly to the support member 9, the receiving member 13 a (13 b) of the built-in weight 10 is formed downward on the locking member 13 so as to face the receiving portions 9 a and 9 b of the support member 9.
[0023]
This locking member is supported by a support material 14 having elasticity. The elasticity of the support member 14 is set to a strength that does not cause a large load on the built-in weight lifting mechanism including the motor 5 when the built-in weight 10 is located at the upper limit. Reference numeral 15 denotes a stopper that is connected to a housing or the like constituting the weighing device and that protrudes toward the locking member 13. The stopper 15 is formed so that a gap W is formed between the stopper 15 and the locking member 13 when the built-in weight 10 is at the upper limit position. Further, the gap W is provided between the built-in weight 10 positioned between the locking member 13 and the support member 9 when the locking member 13 moves upward against the elasticity of the support material 14 due to inclination or vibration of the weighing device. The stopper 15 is allowed to displace within a range where the stopper does not fall off.
[0024]
The stopper 15 is configured as a part of a casing of a weighing device made of a metal material such as plastic or aluminum die cast. In addition to such a configuration, the stopper 15 is an elastic body having elasticity stronger than the support material 14. Also good. In this case, the elastic body as the stopper allows the displacement of the locking member 13 within a range in which the built-in weight 10 does not fall off. When the built-in weight 10 is at the upper limit position, a gap W is formed between the locking member 13 and the stopper, which is an elastic body, as in the case of the stopper 15, and the strong elasticity of the stopper, which is an elastic body. Do not apply load to the lifting mechanism. When the stopper is an elastic body, even when the locking member 13 is suddenly displaced so as to collide with the stopper when the weighing device encounters a strong shaking, the displacement is absorbed by the elastic body of the stopper. Therefore, there is no possibility that the locking member 13 and the built-in weight 10 are damaged.
[0025]
Next, the operating state of the above-described apparatus will be described.
At the time of calibration, the motor 4 rotates the cam 4 to raise the end 1A of the seesaw member 1 from the Y ₁ position to the X ₁ position. Thus by the weight of the incorporated weight 10 which support members 9 connected to the other end 1B of the seesaw member 1 is mounted, vertically lowered to the X ₂ direction along the guide shaft 11 A- 11 C. In this case, even if difficult to equal to smoothly descends a guide shaft 11A~11C and bearing 9A~9C wear, end 1A of the seesaw member 1 by the spring 8 is raised to the position of the X ₁ from the position of Y ₁ The other end 1B of the seesaw member 1 is connected to the support member 9 by connecting means such as a screw 12. Thus other end 1B is caused to forcibly descend into X ₂ direction by the elasticity of the spring 8, and the downward movement of the support member 9 and driven into the lowering is always performed smoothly. Incidentally, since the end 1B of the seesaw member 1 is always in contact with the back surface of the support member 9 when the support member 9 is raised, the raising operation can be performed smoothly regardless of the presence or absence of the spring 8.
[0026]
When the built-in weight 10 is lowered, the built-in weight 10 is locked to the built-in weight receiving portion 16 (see FIG. 2) provided in the transmission member 17 of the weighing device, and the load is passed through the load transmission member 17. It is transmitted to a load measuring unit such as an electromagnetic unit, and calibration as a weighing device is performed.
[0027]
Once completed the calibration, other manual or motor 5 is rotated again by the by the command signal automatically end 1A of the seesaw member 1 is lowered in the Y ₁ direction by the rotation of the cam 4, the seesaw member Correspondingly end 1B rises to Y ₂ direction. When the built-in weight 10 approaches the upper limit, the built-in weight 10 comes into contact with the locking member 13, and at the upper limit, the support member 9 on the lifting mechanism side and the locking member 13 supported by the elastic support member 14. It is held in a state of being securely clamped. However, as described above, the elasticity of the support member 14 is set in a range in which the lifting mechanism is not damaged, so that the locking member 13 is moved against the elasticity of the support member 14 due to vibration or impact during transportation of the weighing device. In some cases, the support member 9 may be separated from the support member 9. However, since the displacement of the locking member 13 beyond the gap W is regulated by the stopper 15, there is no problem such as dropping of the built-in weight 10.
[0028]
【The invention's effect】
As described above in detail, according to the present invention, the support member and the seesaw member that moves the support member up and down are connected via the connecting means. Even if wear or the like occurs between the support member and the member that guides the raising and lowering of the support member by providing an elastic body that urges the operation of the support member in the direction of lowering the support member with respect to the seesaw member. Therefore, the lifting / lowering operation can be always maintained smoothly.
[0029]
In addition, the locking member that locks the built-in weight in the raised position is configured with elasticity within a range that does not cause damage to the built-in weight lifting / lowering mechanism. Since no load is applied, and the displacement of the locking member is limited by the stopper, there is no problem such as dropping of the built-in weight, and the built-in weight can be reliably supported.
[Brief description of the drawings]
FIG. 1 is a perspective view of a built-in weight lifting mechanism showing an embodiment of the present invention.
FIG. 2 is a plan view of the mechanism shown in FIG.
FIG. 3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is a conceptual diagram of a conventional built-in weight lifting / lowering mechanism.
[Explanation of symbols]
1 Seesaw member 1A Lifting mechanism side end 1B (of seesaw member) Support member connection side end 3 (Seesaw member) Support member connection side end 3 Rotating shaft 4 Eccentric cam 5 Motor 8 Spring 9 Support members 9a, 9b Built-in weight locking portions 11A, 11B 11C Guide shaft 13 Locking member 14 (having elasticity) Support material 15 Stopper 16 Built-in weight receiving portion 17 Load transmission member W Gap between the locking member and the stopper

Claims

円筒形状の内蔵分銅を昇降させることにより秤量装置の荷重伝達機構に対する内蔵分銅の加除を行うよう構成したものにおいて、内蔵分銅（１０）を載置して当該内蔵分銅（１０）を昇降させ、かつ内蔵分銅（１０）を軸心方向おいて支持する受け部（９ａ）、（９ｂ）を有する支持部材（９）と、この支持部材（９）の昇降を案内する１以上のガイド軸（１１Ａ）、（１１Ｂ）、（１１Ｃ）と、支持部材（９）を昇降動作させるシーソー部材（１）と、内蔵分銅（１０）を介して支持部材（９）の上部に配置された係止部材（１３）とを有し、当該係止部材（１３）は弾性材（１４）により支持され、かつ内蔵分銅１０を軸心方向において支持する受け部（１３ａ）、（１３ｂ）を有し、係止部材（１３）に対しては内蔵分銅（１０）が上限位置にあるときに、間隙（Ｗ）を以てストッパ（１５）が近接配置され、シーソー部材（１）の一端は連結手段により支持部材（９）と連結し、かつシーソー部材（１）の他端は当該シーソー部材（１）を揺動動作させる駆動部と接続し、前記支持部材（９）はシーソー部材（１）の揺動動作に従動して昇降動作を行うよう構成したことを特徴とする内蔵分銅昇降装置。 In the structure in which the built-in weight is added to or removed from the load transmission mechanism of the weighing device by raising and lowering the cylindrical built-in weight, the built-in weight (10) is placed, the built-in weight (10) is moved up and down, and A support member (9) having receiving portions (9a) and (9b) for supporting the built-in weight (10) in the axial direction, and one or more guide shafts (11A) for guiding the lifting and lowering of the support member (9 ) , (11B), (11C) , a seesaw member (1 ) for moving the support member (9) up and down, and a locking member (13) disposed above the support member (9) via a built-in weight (10). The locking member (13) is supported by the elastic material (14) and has receiving portions (13a) and (13b) for supporting the built-in weight 10 in the axial direction, and the locking member For (13), the built-in weight (10) is When in the position, is disposed adjacent the stopper (15) with a gap (W), one end of the seesaw member (1) is connected with the supporting member by connecting means (9), and the other end of the seesaw member (1) is The built-in structure is characterized in that the seesaw member (1) is connected to a drive unit that swings, and the support member (9) is configured to move up and down following the swinging motion of the seesaw member (1). Weight lifting device.

前記シーソー部材（１）の駆動部接続側端部には、当該駆動部接続側端部が上昇方向に付勢されよう弾性部材（８）が設けられ、これより支持部材（９）は内蔵分銅（１０）の自重による下降に加えて、連結手段を介してシーソー部材（１）により下降方向に移動するよう付勢されることを特徴とする請求項１記載の内蔵分銅昇降装置。An elastic member (8) is provided at the drive unit connection side end of the seesaw member (1) so that the drive unit connection side end is urged in the upward direction, so that the support member (9) is a built-in weight. 2. The built-in weight lifting / lowering device according to claim 1, wherein, in addition to the descent caused by its own weight in (10) , the seesaw member (1) is urged to move in the descent direction via the connecting means.

シーソー部材（１）を揺動動作させる機構は、シーソー部材（１）の一端と接触し、かつ回転軸が偏向している偏心カム（４）と、この偏心カム（４）を回転動作させる駆動装置とからなっていることを特徴とする請求項１又は２に記載の内蔵分銅昇降装置。Mechanism for swinging operation of the seesaw member (1) is in contact with one end of the seesaw member (1), and the driving eccentric cam rotating shaft is deflected (4), for rotating operating the eccentric cam (4) The built-in weight lifting / lowering device according to claim 1, wherein the built-in weight lifting / lowering device is provided.

前記係止部材（１３）は上限に位置する当該内蔵分銅（１０）に当接するよう構成され、かつ係止部材（１３）に対してはストッパ（１５）が近接配置され、当該ストッパ（１５）によって係止部材（１３）の変位が規制されることにより上限位置の内蔵分銅（１０）が脱落するのを防止するよう構成したことを特徴とする請求項１乃至３の何れかに記載の内蔵分銅昇降装置。The locking member (13) is configured to contact the built-in weight (10) positioned at the upper limit, and a stopper (15) is disposed close to the locking member (13) , and the stopper (15) The built-in weight according to any one of claims 1 to 3, wherein the built-in weight (10) at the upper limit position is prevented from falling off due to the displacement of the locking member (13) being restricted by Weight lifting device.