JP5628526B2

JP5628526B2 - Electronic scales

Info

Publication number: JP5628526B2
Application number: JP2010009208A
Authority: JP
Inventors: 勲一村田; 健太山田
Original assignee: アンリツ産機システム株式会社
Priority date: 2010-01-19
Filing date: 2010-01-19
Publication date: 2014-11-19
Anticipated expiration: 2030-01-19
Also published as: JP2011149730A

Description

本発明は、被計量物の質量を測定する電子秤に係り、特に筐体等と内部の計量機構との間に設けられた防水・防塵用の分離部材が、外気温度の変化等による影響を受けて計量精度を低下させることを防止した電子秤に関する。 The present invention relates to an electronic balance that measures the mass of an object to be weighed, and in particular, a waterproof / dustproof separating member provided between a housing or the like and an internal weighing mechanism is affected by changes in the outside air temperature. The present invention relates to an electronic balance that is prevented from being reduced in accuracy by weighing.

下記特許文献１には、本体ケースの側面側にダイヤフラムを配置した場合においても計量精度と応答性が維持可能であることを目指した計量装置が開示されている。この計量装置によれば、本体ケース内のロードセルに連結された支柱５４の前端部を、本体ケースの側面の円形開口３ａ′から突出させ、この前端部に計量ホッパを支持させている。そして、外周部５６ａと内周部５６ｂを薄膜蛇腹状の連結部５６ｃで一体につないだダイヤフラム５６を、開口３ａ′の縁部と支柱５４の外縁部に取り付けて両者間の隙間を閉鎖する。ここで、外周部５６ａと内周部５６ｂとを水平方向にオフセットさせると共に、連結部５６ｃにある３つの湾曲部を、湾曲方向が水平方向となるように配置する。係る構造によれば、支柱５４が下方に変位したとき、該支柱５４の左右両側部において前記変位に対するダイヤフラムの抵抗が軽減されるので、計量装置の計量精度と応答性が維持されるものとされている。 Patent Document 1 listed below discloses a weighing device that aims to maintain weighing accuracy and responsiveness even when a diaphragm is disposed on the side surface of a main body case. According to this weighing device, the front end portion of the column 54 connected to the load cell in the main body case is protruded from the circular opening 3a ′ on the side surface of the main body case, and the weighing hopper is supported by the front end portion. Then, a diaphragm 56 in which the outer peripheral portion 56a and the inner peripheral portion 56b are integrally connected by a thin-film bellows-like connecting portion 56c is attached to the edge portion of the opening 3a ′ and the outer edge portion of the column 54, thereby closing the gap between the two. Here, the outer peripheral portion 56a and the inner peripheral portion 56b are offset in the horizontal direction, and the three bending portions in the connecting portion 56c are arranged so that the bending direction is in the horizontal direction. According to such a structure, when the column 54 is displaced downward, the resistance of the diaphragm to the displacement is reduced at both the left and right sides of the column 54, so that the weighing accuracy and responsiveness of the weighing device are maintained. ing.

下記特許文献２には、計量機構を覆う筐体の開口部に防水・防塵用の密封部材を適正な状態で取り付けた電子天秤が開示されている。この発明によれば、荷重の受け部41,42 を上面に備えた計量機構(10,2,4,40) が底板67の上にあり、計量機構を覆う筐体60には、受け部41,42 を外部に表出する開口61,62 がある。じゃばら部材90の下端は開口の周囲に固定され、じゃばら部材90の上端はじゃばら受け80の上面に固定される。受け部の支持軸43は、じゃばら受け80の大径の通孔82を余裕を以って挿通する。じゃばら部材が変形しないように受け部に対してじゃばら受けの位置を定め、ねじでじゃばら受けを受け部に固定する。筐体自体や筐体と本体の組み立てに誤差等があっても、じゃばら部材を無理な力が加えられた状態で取り付けなくてすむので測定に誤差が生じるおそれがなく、水分や塵埃の多い使用環境であっても安定して高い信頼性をもって使用できるものとされている。 Patent Document 2 below discloses an electronic balance in which a waterproof / dustproof sealing member is attached in an appropriate state to an opening of a housing that covers a measuring mechanism. According to the present invention, the weighing mechanism (10, 2, 4, 40) having the load receiving portions 41, 42 on the upper surface is provided on the bottom plate 67, and the receiving portion 41 is provided on the casing 60 covering the weighing mechanism. , 42 are exposed to the outside. The lower end of the loose member 90 is fixed around the opening, and the upper end of the loose member 90 is fixed to the upper surface of the loose receiver 80. The support shaft 43 of the receiving part is inserted through the large-diameter through hole 82 of the bellows receiver 80 with a margin. The position of the loose receiving member is determined with respect to the receiving portion so that the loose member is not deformed, and the loose receiving member is fixed to the receiving portion with a screw. Even if there is an error in the housing itself or the assembly of the housing and the main body, it is not necessary to attach the loose member with excessive force applied, so there is no risk of measurement error, and usage with a lot of moisture and dust Even in the environment, it can be used stably and with high reliability.

特開２００３−２１５５４号公報JP 2003-21554 A 特開２００２−１０７２１８号公報JP 2002-107218 A

上述した特許文献１に記載の発明によれば、本体ケースと、本体ケースの開口を挿通する支柱との間に設けられるダイヤフラム５６は、外周部と内周部を蛇腹状の連結部で一体につないだ構成であり、一般にゴムで構成されているため、外気温度の変化によってゴムの硬度が変化してゼロ値に変動を与えて質量の測定精度が低下することがあり、これが高速高精度の測定を実現する上での障害になるという問題があった。 According to the invention described in Patent Document 1 described above, the diaphragm 56 provided between the main body case and the support column that passes through the opening of the main body case is integrated with the outer peripheral portion and the inner peripheral portion by the bellows-shaped connecting portion. Because it is generally composed of rubber, the hardness of the rubber may change due to changes in the outside air temperature, causing the zero value to fluctuate, resulting in a decrease in mass measurement accuracy. There was a problem that it became an obstacle to realizing the measurement.

また、上述した特許文献２に記載の発明によれば、筐体と、筐体の開口を挿通する荷重の受け部との間に設けられるじゃばら部材９０は、上部と下部の間がじゃばら状となった部材であり、一般にゴムで構成されているため、特許文献１記載の発明の場合と同様の問題があった。 According to the invention described in Patent Document 2 described above, the loose member 90 provided between the housing and the load receiving portion that is inserted through the opening of the housing has a loose shape between the upper portion and the lower portion. Since these members are generally made of rubber, there are problems similar to those of the invention described in Patent Document 1.

本発明は、以上の問題点に鑑みてなされたものであり、非負荷側部材である筐体等と、その内部にある負荷側部材である計量機構との間に設けられた防水・防塵用の分離部材が外気温度の変化等による影響を受けにくく、計量精度の低下が少ない電子秤を提供することを目的としている。 The present invention has been made in view of the above-described problems, and is for waterproofing and dustproofing provided between a casing or the like that is a non-load side member and a weighing mechanism that is a load side member inside the case. It is an object of the present invention to provide an electronic balance in which the separation member is less affected by changes in the outside air temperature and the like, and the decrease in measurement accuracy is small.

請求項１に記載された電子秤１は、
被計量物の荷重が加わる負荷側部材６，８，１１と、
前記負荷側部材６，８，１１の少なくとも一部を内部に収納する非負荷側部材７と、
前記負荷側部材６，８，１１の側に接触して圧縮された状態で固定される周状の突起部２２を備えた相対的に肉厚の第１固定部１８と、前記非負荷側部材７と接触して圧縮された状態で固定される周状の突起部２５を備えた相対的に肉厚の第２固定部１９と、前記第１固定部１８と前記第２固定部１９を周状の一体構造で接続する相対的に薄肉の可変形部２０を備えた分離部材１３とを有し、前記第１固定部１８と前記第２固定部１９の少なくとも一方に、前記突起部２２，２５に近接して周状の溝２３，３３，４３，５３，６３，７３，８３，９３を形成した電子秤（１）において、
前記第１固定部１８に設けられた前記突起部２２の径と、前記第２固定部１９に設けられた前記突起部２５の径が互いに異なり、前記負荷側部材６，８，１１の側及び前記非負荷側部材７に両突起部２２，２５が同等の力で固定されており、前記第１固定部１８と前記第２固定部１９のうち、径が小さい前記突起部２２，２５を有する方に前記溝２３，３３，４３，５３，６３，７３，８３，９３が形成されたことを特徴としている。 The electronic balance 1 according to claim 1 is:
Load side members 6, 8, 11 to which the load of the object to be weighed is applied;
A non-load-side member 7 that houses at least a part of the load-side members 6, 8, 11;
And the load-side member first fixing portion 18 relatively thick having a circumferential protrusion 22 which is fixed in a state of being compressed in contact with the side of 6,8,11, the non-load side a second fixing portion 19 of the relatively thick having a circumferential protrusion 25 which contacts with the member 7 is fixed in a state of being compressed, the said first fixing portion 18 and the second fixed portion 19 the circumferential and a separation member 13 having a relatively thin deformable portion 20 to connect with integrated structure, on at least one of the first fixing portion 18 and the second fixing portion 19, the protrusion in the electronic balance (1) that forms the shape of the circumferential grooves 23,33,43,53,63,73,83,93 close to the parts 22 and 25,
The diameter of the protruding portion 22 provided on the first fixing portion 18 and the diameter of the protruding portion 25 provided on the second fixing portion 19 are different from each other, and the side of the load side members 6, 8, 11 and Both protrusions 22 and 25 are fixed to the non-load-side member 7 with the same force, and the protrusions 22 and 25 having a small diameter among the first fixing part 18 and the second fixing part 19 are provided. The grooves 23, 33, 43, 53, 63, 73, 83, 93 are formed on the side.

請求項２に記載された電子秤１は、請求項１記載の電子秤１において、
前記溝５３，６３，７３，９３が、前記突起部２２，２５が形成されている側とは反対側の面に形成されていることを特徴としている。 Electronic balance 1 according to claim 2, in the electronic balance 1 according to claim 1,
The grooves 53, 63, 73, 93 are formed on the surface opposite to the side on which the protrusions 22, 25 are formed.

請求項１に記載された電子秤１によれば、負荷側部材６，８，１１の側と非負荷側部材７の間を塞いでいる分離部材１３は、負荷側部材６，８，１１の側及び非負荷側部材７に固定された第１固定部１８及び第２固定部１９が、可変形部２０によって一体構造で連続した構成とされているが、第１固定部１８及び第２固定部１９には固定用の各突起部２２，２５に近接して周状の溝２３，３３，４３，５３，６３，７３，８３，９３が形成されているので、外気温度の変化によって分離部材１３の硬度等の特性が変化しても、これによる変形等の影響が各部の間で伝達されにくい。また、負荷側部材６，８，１１の側と非負荷側部材７に対し、肉厚が大きい第１乃至第２固定部１８，１９及びその突起部２２，２５が圧縮されて固定されたことにより、分離部材１３には歪や変形が生じるが、これらの歪や変形は突起部２２，２５の近傍に形成された溝２３，３３，４３，５３，６３，７３，８３，９３によって可変形部２０には伝わりにくくなる。従って、この電子秤１によれば、分離部材１３が受ける外気温度の変化や取付け時に生じる変形等の影響が可及的に減少し、そのためにゼロ値の変動が抑えられて計量精度の低下が少なくなるという効果が得られる。
また、第１固定部１８に設けられた突起部２２の径と、第２固定部１９に設けられた突起部２５の径が互いに異なり、負荷側部材６，８，１１の側及び非負荷側部材７に両突起部２２，２５が同等の力で固定されている場合には、第１固定部１８と第２固定部１９のうち、径が小さい方の突起部２２，２５に生じる応力が他方に比べて大きくなる。そこで、特に径が小さい方の突起部２２，２５に近接して第１固定部１８又は第２固定部１９に溝２３，３３，４３，５３，６３，７３，８３，９３を設けることとすれば、取り付け時に当該突起部２２，２５や当該突起部２２，２５が設けられた第１固定部１８又は第２固定部１９が圧縮されて他方より大きな応力を発生した場合、これにより生じる歪、変形を直近の溝で効果的に緩衝して他部に伝達しないようにすることができる。 According to the electronic balance 1 described in claim 1, the separating member 13 closing the space between the load side members 6, 8, 11 side and the non-load side member 7 is the load side members 6, 8, 11. the first fixing portion 18 and the second fixing portion 19 fixed to the side and non-load-side member 7, has been an integral structure with continuous with the structure by a deformable portion 20, the first fixing portion 18 and a second since circumferential grooves 23,33,43,53,63,73,83,93 close to the protrusions 22 and 25 of the solid-titration, the fixed portion 19 is made form, the outside air temperature change Even if the characteristics such as the hardness of the separating member 13 change due to this, the influence of deformation or the like due to this is difficult to be transmitted between the parts. Further, with respect to the side and the non-load side member 7 of the load-side member 6,8,11, first to second fixing portions 18, 19 and the projections 22 and 25 that the thickness is large it is fixed is compressed by, although distortion or deformation occurs in the separation member 13, these distortion and deformation by grooves 23,33,43,53,63,73,83,93 been made form in the vicinity of the protrusion 22, 25 It becomes difficult to be transmitted to the deformable portion 20. Therefore, according to the electronic scale 1, the influence of the change in the outside air temperature received by the separation member 13 and the deformation caused at the time of attachment is reduced as much as possible, so that the fluctuation of the zero value is suppressed and the measurement accuracy is lowered. The effect of decreasing is obtained.
Moreover, the diameter of the protrusion part 22 provided in the 1st fixing | fixed part 18 and the diameter of the protrusion part 25 provided in the 2nd fixing | fixed part 19 are mutually different, and the load side member 6, 8, 11 side and the non-load side When the protrusions 22 and 25 are fixed to the member 7 with the same force, the stress generated in the protrusions 22 and 25 having a smaller diameter among the first fixing part 18 and the second fixing part 19 is generated. Larger than the other. Therefore, the grooves 23, 33, 43, 53, 63, 73, 83, 93 are provided in the first fixing part 18 or the second fixing part 19 in the vicinity of the protrusions 22, 25 having a smaller diameter. For example, when the first fixing part 18 or the second fixing part 19 provided with the protrusions 22 and 25 or the protrusions 22 and 25 is compressed and generates a larger stress than the other, The deformation can be effectively buffered by the nearest groove so as not to be transmitted to the other part.

請求項２に記載された電子秤１によれば、請求項１記載の電子秤１による効果において、前記溝５３，６３，７３，９３を、突起部２２，２５が形成されている側ではなく、これとは反対側の面に形成することにより、溝内にごみ等の異物が堆積しにくく、また洗浄時の水が溜まらないので黴が生じず衛生的であり、食品の計量等の用途に特に適している。 According to the electronic balance 1 described in claim 2 , in the effect of the electronic balance 1 according to claim 1 , the grooves 53, 63, 73, 93 are not arranged on the side where the protrusions 22, 25 are formed. By forming it on the opposite side, foreign materials such as dust are hard to accumulate in the groove, and water is not collected at the time of washing, so it is hygienic and does not cause wrinkles. Especially suitable for.

本発明の第１実施形態である電子秤の分解拡散斜視図である。1 is an exploded perspective view of an electronic balance according to a first embodiment of the present invention. 第１実施形態の電子秤において分離部材の取り付け構造を示す分解拡散斜視図である。It is a disassembled diffusion perspective view which shows the attachment structure of the separation member in the electronic balance of 1st Embodiment. 第１実施形態の電子秤の外観斜視図である。It is an external appearance perspective view of the electronic balance of 1st Embodiment. 第１実施形態の電子秤の分離部材付近における組み立て途中の状態を示す断面図である。It is sectional drawing which shows the state in the middle of the assembly in the separation member vicinity of the electronic balance of 1st Embodiment. 第１実施形態の電子秤の分離部材付近における組み立て状態を示す断面図である。It is sectional drawing which shows the assembly state in the separation member vicinity of the electronic balance of 1st Embodiment. 第１実施形態の電子秤における分離部材の断面図である。It is sectional drawing of the separation member in the electronic balance of 1st Embodiment. 第２実施形態の電子秤における分離部材の断面図である。It is sectional drawing of the separation member in the electronic balance of 2nd Embodiment. 第３実施形態の電子秤における分離部材の断面図である。It is sectional drawing of the separation member in the electronic balance of 3rd Embodiment. 第４実施形態の電子秤における分離部材の断面図である。It is sectional drawing of the separation member in the electronic balance of 4th Embodiment. 第５実施形態の電子秤における分離部材の断面図である。It is sectional drawing of the separation member in the electronic balance of 5th Embodiment. 第６実施形態の電子秤における分離部材の断面図である。It is sectional drawing of the separation member in the electronic balance of 6th Embodiment. 第７実施形態の電子秤における分離部材の断面図である。It is sectional drawing of the separation member in the electronic balance of 7th Embodiment. 第８実施形態の電子秤における分離部材の断面図である。It is sectional drawing of the separation member in the electronic balance of 8th Embodiment. 第９実施形態の電子秤における分離部材の断面図である。It is sectional drawing of the separation member in the electronic balance of 9th Embodiment.

本発明の第１実施形態に係る電子秤について説明する。
まず図１〜図３を参照して本実施形態に係る電子秤１の概要構成について説明する。図１に示すように、ベース板２の上には、被計量物の荷重が加わる負荷側部材としてのロバーバル機構３が固定されている。ロバーバル機構３の内部には、レバー４と、レバー４を平衡状態に制御する電磁コイル５からなる平衡駆動手段と、位置検出手段（不図示）が設けられている。またロバーバル機構３の可動部には、前記負荷側部材として、鞍状の荷重受け部材６が固定されており、この荷重受け部材６上に図示しないコンベアを載置すれば動秤を構成することができる。 An electronic balance according to a first embodiment of the present invention will be described.
First, a schematic configuration of the electronic balance 1 according to the present embodiment will be described with reference to FIGS. As shown in FIG. 1, on the base plate 2, a Roverval mechanism 3 is fixed as a load side member to which a load of an object to be weighed is applied. Inside the Roverval mechanism 3, there are provided a lever 4, a balanced driving means comprising an electromagnetic coil 5 for controlling the lever 4 in a balanced state, and a position detecting means (not shown). Further, a saddle-shaped load receiving member 6 is fixed to the movable portion of the Roverval mechanism 3 as the load side member, and if a conveyor (not shown) is placed on the load receiving member 6, a dynamic balance is configured. Can do.

図２及び図３に示すように、これら負荷側部材からなる機構は、被計量物の荷重が加わらない非負荷側部材としての筐体７内に収納される。図１乃至図２に示すように、荷重受け部材６と一体の部位であり、従って負荷側部材である受け部８と、これに設けられた支持軸９は、組み立て途中の状態において筐体７の開口１０から上方外側に突出している。図２に示すように、受け部８の上方から、受け部８に一体に取り付けられて負荷側部材となる円盤状のジャバラ受け１１と、非負荷側部材である筐体７に一体に取り付けられる環状のジャバラ取付部材１２と、筐体７内を外界から遮断する分離部材としてのジャバラ１３と、蓋状のカバー１４とを順に組み付け、最後に支持軸９にナット１５をねじ込んでカバー１４を固定すれば、図３に示すように電子秤１として完成する。そして、図示はしないが、カバー１４上に見えている支持軸９に梁１６を介してコンベアが取り付けられる。なお、梁１６はコンベアに加わる荷重を秤に正確に伝達するための剛体部品である。このように、非負荷側部材としての筐体７と、筐体７の開口１０内にある負荷側部材としての受け部８との間に、分離部材であるジャバラ１３が取り付けられているので、負荷側部材が収納された筐体７の内部を外部に対して閉鎖し、水分や塵埃が筐体７の内部に入らないようにした状態で、前記コンベアにより被計量物を搬送させながら図示しない制御部によって被計量物の質量を測定することができる。
なお、本実施形態では、非負荷側部材である筐体７と、その開口１０から突出している負荷側部材であるジャバラ受け１１との間に分離部材としてのジャバラ１３を設けたが、要するに、非負荷側部材の内部に少なくとも一部が収納されている負荷側部材の何れかの部分と、非負荷側部材との間に分離部材を配置することにより、負荷側部材が収納された非負荷側部材の内部空間について、分離部材が固定された部位よりも内側を外部に対して閉鎖できるようになっていればよい。 As shown in FIGS. 2 and 3, the mechanism composed of these load side members is housed in a housing 7 as a non-load side member to which the load of the object to be weighed is not applied. As shown in FIGS. 1 and 2, the receiving portion 8 that is an integral part of the load receiving member 6, and thus the load side member, and the support shaft 9 provided on the receiving portion 8 are in the state of being assembled in the housing 7. Projecting upward and outward from the opening 10. As shown in FIG. 2, from above the receiving portion 8, the disc-shaped bellows receiver 11 that is integrally attached to the receiving portion 8 and serves as a load side member and the housing 7 that is a non-load side member are integrally attached. An annular bellows mounting member 12, a bellows 13 as a separating member that shields the inside of the housing 7 from the outside, and a lid-like cover 14 are assembled in order, and finally a nut 15 is screwed onto the support shaft 9 to fix the cover 14. Then, the electronic balance 1 is completed as shown in FIG. Although not shown, a conveyor is attached to the support shaft 9 that is visible on the cover 14 via the beam 16. The beam 16 is a rigid part for accurately transmitting the load applied to the conveyor to the scale. Thus, since the bellows 13 as the separation member is attached between the housing 7 as the non-load side member and the receiving portion 8 as the load side member in the opening 10 of the housing 7, The inside of the housing 7 in which the load side member is accommodated is closed with respect to the outside so that moisture and dust do not enter the inside of the housing 7 and the object to be weighed is transported by the conveyor and is not shown. The mass of the object to be weighed can be measured by the control unit.
In the present embodiment, the bellows 13 as the separation member are provided between the housing 7 that is a non-load side member and the bellows receiver 11 that is a load side member protruding from the opening 10. A non-load in which the load-side member is accommodated by disposing a separation member between any part of the load-side member that is at least partially housed inside the non-load-side member and the non-load-side member It is only necessary that the inner space of the side member can be closed to the outside with respect to the portion where the separation member is fixed.

次に前記ジャバラ１３の構造と、その取付構造の詳細について図２及び図４〜図６を参照して説明する。
このジャバラ１３は、前述したように、非負荷側部材である筐体７の円形の開口１０と、この開口１０を貫通して配置される負荷側部材としての受け部８との間に取り付けられる全体として円筒形でゴム等の可撓性部材乃至弾性部材からなる部材であり、筐体７内を外界に対して防水・防塵するために設けられる。 Next, the structure of the bellows 13 and the details of the mounting structure will be described with reference to FIGS. 2 and 4 to 6.
As described above, the bellows 13 is attached between the circular opening 10 of the housing 7 that is a non-load side member and the receiving portion 8 that is a load side member disposed through the opening 10. The overall member is a cylindrical member made of a flexible member such as rubber or an elastic member, and is provided for waterproofing and dustproofing the inside of the housing 7 against the outside.

図２及び図６に示すように、本実施形態のジャバラ１３は、負荷側部材であるジャバラ受け１１に取り付けられる環状の第１固定部１８と、非負荷側部材である筐体７の開口１０に取り付けられる環状の第２固定部１９と、第１及び第２固定部１８，１９を一体構造で連結しているジャバラ状の可変形部２０とを有している。第１及び第２固定部１８，１９は、可変形部２０と比較した場合には相対的に肉厚であり、逆に可変形部２０は、第１及び第２固定部１８，１９と比較した場合には相対的に肉薄である。例えば第１固定部１８は、直径が６５ｍｍ程度のサイズの場合には厚さが２．５乃至３ｍｍ程度であり、第２固定部１９は、直径が８０ｍｍ程度のサイズの場合には厚さが１乃至１．５ｍｍ程度であるが、その場合には可変形部２０の厚さは０．５ｍｍ程度である。なお、可変形部２０との名称は、ジャバラ受け１１が移動しても可変形部２０がジャバラ状構造によって当該移動に追従しうることを示すものであり、これに対して第１及び第２固定部１８，１９が変形しないことを示すものではなく、可変形部２０と同様にゴム等からなる第１及び第２固定部１８，１９も取付時には後述するように圧縮されて変形する。 As shown in FIGS. 2 and 6, the bellows 13 of the present embodiment includes an annular first fixing portion 18 attached to a bellows receiver 11 that is a load-side member, and an opening 10 of the housing 7 that is a non-load-side member. And a bellows-shaped deformable portion 20 that connects the first and second fixing portions 18 and 19 in an integral structure. The first and second fixing portions 18 and 19 are relatively thick when compared to the deformable portion 20, and conversely, the deformable portion 20 is compared with the first and second fixing portions 18 and 19. If so, it is relatively thin. For example, the first fixing portion 18 has a thickness of about 2.5 to 3 mm when the diameter is about 65 mm, and the second fixing portion 19 has a thickness when the diameter is about 80 mm. In this case, the thickness of the deformable portion 20 is about 0.5 mm. The name of the deformable portion 20 indicates that the deformable portion 20 can follow the movement by the bellows-like structure even if the bellows receiver 11 moves. It does not indicate that the fixing portions 18 and 19 are not deformed. Like the deformable portion 20, the first and second fixing portions 18 and 19 made of rubber or the like are also compressed and deformed as described later at the time of attachment.

図６に示すように、周状の第１固定部１８の下面内縁には、下方に突出した周状の係合突起２１が形成されている。また、係合突起２１に近接する第１固定部１８の上面内縁には、上方に突出した断面半円形で周状の突起部２２が形成されている。そして、第１固定部１８の上面側には、周状の突起部２２の外側の直近位置に、周状の溝２３が形成されている。この溝２３は、断面Ｕ字形であり、その深さは第１固定部１８の厚さの１／３程度よりも小さくすることが好ましい。このような構造は、型に溶融したゴム材を流し込んで成形することができる。 As shown in FIG. 6, a circumferential engagement protrusion 21 that protrudes downward is formed on the inner edge of the lower surface of the circumferential first fixing portion 18. Further, a semi-circular cross-sectional protrusion 22 protruding upward is formed on the inner edge of the upper surface of the first fixing part 18 adjacent to the engagement protrusion 21. A circumferential groove 23 is formed on the upper surface side of the first fixing portion 18 at a position closest to the outside of the circumferential projection 22. The groove 23 is U-shaped in cross section, and the depth is preferably smaller than about 1/3 of the thickness of the first fixing portion 18. Such a structure can be molded by pouring a molten rubber material into a mold.

図６に示すように、周状の第２固定部１９は第１固定部１８よりも外径が大きく、内方側が開口した断面コ字形の袋状になっており、その下面には孔２４が要所（本実施形態では等角度間隔で３箇所）に形成されるとともに、その下面の孔２４よりも外方には、下方に突出した断面半円形で周状の突起部２５が形成されている。 As shown in FIG. 6, the circumferential second fixing portion 19 has a bag shape with a U-shaped cross section having an outer diameter larger than that of the first fixing portion 18 and opened on the inner side. Is formed at the main points (in this embodiment, at three equiangular intervals), and at the outer side of the hole 24 on the lower surface, a semicircular cross-sectional protrusion portion 25 protruding downward is formed. ing.

図２、図４及び図５に示すように、ジャバラ受け１１には受け部８の支持軸９よりも大径の貫通孔２６が形成されており、ジャバラ受け１１は貫通孔２６に支持軸９を貫通させて受け部８の上に載置される。またジャバラ受け１１には、上面の外縁に沿って周状の係合溝２７が形成されている。そして図４及び図５に示すように、ジャバラ１３の第１固定部１８は、その係合突起２１をジャバラ受け１１の係合溝２７に係合させて負荷側部材に取り付けられている。そして図４に示すように、第１固定部１８及びジャバラ受け１１の上からカバー１４を被せて支持軸９をカバー１４の孔に挿通させ、図５に示すように、支持軸９にナット１５をねじ込んでカバー１４をジャバラ受け１１に固定する。これによって、図５に示すようにジャバラ１３の第１固定部１８はジャバラ受け１１とカバー１４の間に挟まれて圧縮され、突起部２２は潰されて両者に密着し、防水・防塵機能を発揮するようになる。 As shown in FIGS. 2, 4, and 5, the bellows receiver 11 is formed with a through hole 26 having a diameter larger than that of the support shaft 9 of the receiving portion 8, and the bellows receiver 11 is formed in the through hole 26 with the support shaft 9. And is placed on the receiving portion 8. The bellows receiver 11 is formed with a circumferential engagement groove 27 along the outer edge of the upper surface. As shown in FIGS. 4 and 5, the first fixing portion 18 of the bellows 13 is attached to the load side member with the engagement protrusion 21 engaged with the engagement groove 27 of the bellows receiver 11. As shown in FIG. 4, the cover 14 is put on the first fixing portion 18 and the bellows receiver 11 and the support shaft 9 is inserted into the hole of the cover 14, and the nut 15 is inserted into the support shaft 9 as shown in FIG. 5. To fix the cover 14 to the bellows receiver 11. As a result, as shown in FIG. 5, the first fixing portion 18 of the bellows 13 is sandwiched between the bellows receiver 11 and the cover 14 and compressed, and the protruding portion 22 is crushed and adhered to both, thereby providing a waterproof / dustproof function. To come out.

図２、図４及び図５に示すように、環状のジャバラ取付部材１２の下面には、複数箇所（本実施形態では等角度間隔で３箇所）にジャバラ固定用のねじ棒２８が下方に向けて突出して固定されている。また、筐体７の開口１０の周縁には、複数箇所（本実施形態では等角度間隔で３箇所）に孔２９が形成されている。図４及び図５に示すように、断面コ字形の袋状であるジャバラ１３の第２固定部１９でジャバラ取付部材１２を挟み込み、ジャバラ取付部材１２のねじ棒２８を第２固定部１９の孔２４に挿通させるとともに、さらにねじ棒２８を筐体７の開口１０の周縁に形成された孔２９を挿通させ、筐体７の内側に突出したねじ棒２８にナット３０をねじ込んで第２固定部１９を筐体７側に固定する。これによって、図５に示すようにジャバラ１３の第２固定部１９はジャバラ取付部材１２と筐体７の間に挟まれて圧縮され、突起部２５は潰されて両者に密着し、防水・防塵機能を発揮するようになる。 As shown in FIGS. 2, 4, and 5, on the lower surface of the annular bellows mounting member 12, screw rods 28 for fixing bellows are directed downward at a plurality of locations (in this embodiment, at three equiangular intervals). Protruding and fixed. Further, holes 29 are formed at a plurality of locations (three locations at equal angular intervals in the present embodiment) on the periphery of the opening 10 of the housing 7. As shown in FIGS. 4 and 5, the bellows mounting member 12 is sandwiched by the second fixing portion 19 of the bellows 13 having a bag shape with a U-shaped cross section, and the screw rod 28 of the bellows mounting member 12 is inserted into the hole of the second fixing portion 19. 24, and a screw rod 28 is further inserted into a hole 29 formed in the periphery of the opening 10 of the housing 7, and a nut 30 is screwed into the screw rod 28 protruding to the inside of the housing 7, thereby providing a second fixing portion. 19 is fixed to the housing 7 side. As a result, as shown in FIG. 5, the second fixing portion 19 of the bellows 13 is sandwiched between the bellows mounting member 12 and the casing 7 and compressed, and the protrusion 25 is crushed and closely adhered to both. It comes to show the function.

以上の構成における作用・効果について説明する。
本実施形態の電子秤１によれば、負荷側であるジャバラ受け１１及び受け部８と、非負荷側である筐体７との間はゴム等からなる一体構造のジャバラ１３によって塞がれており、第１固定部１８がジャバラ受け１１とカバー１４の間で固定されている部分と、第２固定部１９が筐体７とジャバラ取付部材１２との間で固定されている部分には、いずれも開口１０に近接して配置された周状の突起部２２，２５があって、これが圧縮されて潰れることで高い防水性及び防塵性が達成されている。従って、筐体７の内部に水分や塵埃が浸入する恐れは小さい。 The operation and effect of the above configuration will be described.
According to the electronic balance 1 of this embodiment, the bellows receiver 11 and the receiving portion 8 on the load side and the casing 7 on the non-load side are closed by the integral bellows 13 made of rubber or the like. The portion where the first fixing portion 18 is fixed between the bellows receiver 11 and the cover 14 and the portion where the second fixing portion 19 is fixed between the housing 7 and the bellows mounting member 12 are Both have circumferential projections 22 and 25 arranged close to the opening 10 and are compressed and crushed to achieve high waterproofness and dustproofness. Therefore, there is little risk of moisture or dust entering the inside of the housing 7.

また本実施形態では、ジャバラ１３は全体として一体構造であり、取付部分である肉厚の第１及び第２固定部１８，１９と、薄肉でジャバラ状の可変形部２０とは連続的につながっている。このため、環境温度が変化してジャバラ１３を構成するゴムの硬度等の特性が変化すると、これによってジャバラ１３の一部に生じた変形が他部に伝達されて質量の測定に誤差をもたらし、秤としてのゼロ値に変動が生じてしまうため、高速高精度の実現に障害となる。しかしながら、本実施形態におけるジャバラ１３は、第１固定部１８の突起部２２の外側の直近位置に、筐体７の開口部に沿うように断面Ｕ字形の溝２３を周状に形成している。従って、温度変化によってジャバラ１３の一部に応力や当該応力等に起因する変形等の不都合が生じても、これが他部分に伝達することはなく、溝２３がこれらの不都合な要因を緩和・吸収するので、電子秤１のゼロ値に有害な程度の変動が生じることが防止され、高速高精度の測定が実現できる。 In the present embodiment, the bellows 13 has an integral structure as a whole, and the thick first and second fixing portions 18 and 19 that are attachment portions and the thin and bellows-shaped deformable portion 20 are continuously connected. ing. For this reason, when the environmental temperature changes and the properties such as the hardness of the rubber constituting the bellows 13 change, the deformation generated in a part of the bellows 13 is transmitted to the other part thereby causing an error in the measurement of the mass. Since the zero value as a scale is fluctuated, it becomes an obstacle to realizing high speed and high accuracy. However, in the present embodiment, the bellows 13 is formed with a U-shaped groove 23 in a circumferential shape so as to follow the opening of the housing 7 at a position closest to the outside of the protrusion 22 of the first fixing portion 18. . Therefore, even if inconvenience such as stress or deformation due to the stress or the like occurs in a part of the bellows 13 due to the temperature change, this does not transmit to other parts, and the groove 23 relaxes and absorbs these inconvenient factors. As a result, it is possible to prevent a harmful fluctuation from occurring in the zero value of the electronic balance 1 and to realize high-speed and high-precision measurement .

また本実施形態では、負荷側の受け部８と、非負荷側の筐体７に対し、肉厚が大きい第１乃至第２固定部１８，１９及び各突起部２２，２５が圧縮されて固定されているため、ジャバラ１３には歪や変形が生じ、その程度は特に変形量が大きい突起部２２，２５の部分で著しい。しかし、これらの歪や変形のうち、少なくとも突起部２２の変形に起因して生じた変形等は、突起部２２の近傍に形成された溝２３によって可変形部２０には伝わりにくいため、取付け状態下で生じる前記変形等の可変形部２０への影響は可及的に減少し、そのために、この点においても電子秤１のゼロ値に有害な程度の変動が生じることが防止され、高速高精度の測定が実現できるという効果が得られる。 In the present embodiment, the first to second fixing portions 18 and 19 and the projections 22 and 25 having a large thickness are compressed and fixed to the receiving portion 8 on the load side and the casing 7 on the non-load side. For this reason, the bellows 13 are distorted and deformed, and the degree of the distortion is particularly remarkable in the portions of the protrusions 22 and 25 having a large deformation amount. However, among these distortions and deformations, at least deformation caused by the deformation of the projection 22 is not easily transmitted to the deformable portion 20 by the groove 23 formed in the vicinity of the projection 22, so that the mounting state The influence on the deformable portion 20 caused by the deformation or the like occurring below is reduced as much as possible. Therefore, a harmful change in the zero value of the electronic balance 1 is also prevented in this respect, and high speed and high speed are prevented. The effect that an accurate measurement is realizable is acquired.

また本実施形態では、第１固定部１８に設けられた周状の突起部２２の径は、第２固定部１９に設けられた周状の突起部２５の径よりも小さい。従って、ジャバラ受け１１や筐体７に対して両突起部２２，２５が同等の力で固定されている場合には、径が小さい第１固定部１８の突起部２２に生じる応力は、径が大きい第２固定部１９の突起部２５に生じる応力に比べて大きくなる。しかし、本実施形態では、特に径が小さい方の突起部２２に近接して第１固定部１８に溝２３を設けたので、取り付け時に第１固定部１８とその突起部２２が圧縮されて他方より大きな応力を発生した場合、これにより生じる歪、変形を直近の溝２３で効果的に緩衝して他部に伝達しないようにすることができる。 Further, in the present embodiment, the diameter of the circumferential protrusion 22 provided on the first fixing part 18 is smaller than the diameter of the circumferential protrusion 25 provided on the second fixing part 19. Therefore, when both the protrusions 22 and 25 are fixed to the bellows receiver 11 and the housing 7 with the same force, the stress generated in the protrusion 22 of the first fixing part 18 having a small diameter is smaller in diameter. This is larger than the stress generated in the protruding portion 25 of the large second fixing portion 19. However, in the present embodiment, since the groove 23 is provided in the first fixing portion 18 in the vicinity of the protrusion portion 22 having a smaller diameter in particular, the first fixing portion 18 and the protrusion portion 22 are compressed during installation, When a larger stress is generated, the distortion and deformation caused thereby can be effectively buffered by the nearest groove 23 so as not to be transmitted to other parts.

また本実施形態では、第１固定部１８に設けられた周状の溝２３は、その断面形状がＵ字形であるため、その内部にごみや埃等が入った場合にも掃除しやすく、また溝２３に力が加わった場合にも溝２３内に応力が集中するような角部がないため、破損しにくいという利点もある。 In the present embodiment, the circumferential groove 23 provided in the first fixing portion 18 is U-shaped in cross section, so that it is easy to clean even when dust or dirt enters inside, and Even when a force is applied to the groove 23, there is no corner portion where stress concentrates in the groove 23, so there is an advantage that it is difficult to break.

本発明の第２実施形態に係る電子秤１に用いられるジャバラ１３ａを図７を参照して説明する。電子秤１のその他の構成は第１実施形態と同一である。
図７に示すように、このジャバラ１３ａは、第１実施形態のジャバラ１３に比べて第１固定部１８の突起部２２からより離れた位置により深い溝３３が形成されている。第１実施形態のジャバラ１３では、第１固定部１８の係合突起２１に近接して溝２３が形成されることとなるため、溝２３を形成した部分では素材の肉厚が極端に薄くなり、前述した有害な変形は伝達しにくくなるものの、予期しない何らかの力が加わった場合に破損しやすい。しかし、このジャバラ１３ａによれば、第１実施形態より深い溝３３を第１実施形態より突起部２２（従って係合突起２１）から離して形成しているので、前述した有害な変形が伝達しにくくい効果は確保しつつ、破損しにくい頑丈さも確保される。 A bellows 13a used in an electronic balance 1 according to a second embodiment of the present invention will be described with reference to FIG. Other configurations of the electronic balance 1 are the same as those in the first embodiment.
As shown in FIG. 7, in the bellows 13a, a deep groove 33 is formed at a position farther from the protrusion 22 of the first fixing portion 18 than the bellows 13 of the first embodiment. In the bellows 13 of the first embodiment, since the groove 23 is formed in the vicinity of the engaging protrusion 21 of the first fixing portion 18, the thickness of the material becomes extremely thin in the portion where the groove 23 is formed. Although the above-mentioned harmful deformation is difficult to transmit, it is easily damaged when an unexpected force is applied. However, according to the bellows 13a, the groove 33 deeper than that in the first embodiment is formed farther from the protrusion 22 (and hence the engagement protrusion 21) than in the first embodiment, so that the harmful deformation described above is transmitted. While ensuring a difficult effect, it is also possible to ensure a robustness that is difficult to break.

本発明の第３実施形態に係る電子秤１に用いられるジャバラ１３ｂを図８を参照して説明する。電子秤１のその他の構成は第１実施形態と同一である。
図８に示すように、このジャバラ１３ｂの第１固定部１８には、突起部２２に近接して断面形状がＶ字形の溝４３が形成されている。第１実施形態では溝２３の形状はＵ字形であったが、加工上の都合等に応じて本実施形態のような形状を選択することも可能である。 A bellows 13b used in an electronic balance 1 according to a third embodiment of the present invention will be described with reference to FIG. Other configurations of the electronic balance 1 are the same as those in the first embodiment.
As shown in FIG. 8, a groove 43 having a V-shaped cross section is formed in the first fixing portion 18 of the bellows 13 b in the vicinity of the protruding portion 22. In the first embodiment, the shape of the groove 23 is U-shaped, but it is also possible to select a shape as in the present embodiment according to processing convenience and the like.

本発明の第４実施形態に係る電子秤１に用いられるジャバラ１３ｃを図９を参照して説明する。電子秤１のその他の構成は第１実施形態と同一である。
図９に示すように、このジャバラ１３ｃの第１固定部１８には、突起部２２に近接して２つの溝２３，３３が並べて形成されている。第１実施形態では溝２３は１本であったが、このように２本並べて配置すれば、１本の場合に比べて有害な応力や変形の伝達を一層効果的に遮断することができる。 A bellows 13c used in an electronic balance 1 according to a fourth embodiment of the present invention will be described with reference to FIG. Other configurations of the electronic balance 1 are the same as those in the first embodiment.
As shown in FIG. 9, two grooves 23 and 33 are formed in the first fixing portion 18 of the bellows 13 c so as to be close to the protruding portion 22. In the first embodiment, the number of the grooves 23 is one. However, if the two grooves are arranged side by side as described above, transmission of harmful stress and deformation can be more effectively blocked as compared with the case of one.

本発明の第５実施形態に係る電子秤１に用いられるジャバラ１３ｄを図１０を参照して説明する。電子秤１のその他の構成は第１実施形態と同一である。
図１０に示すように、このジャバラ１３ｄは、第１固定部１８の裏側に、突起部２２及び係合突起２１に近接して断面Ｕ字形の溝５３が形成されている。溝５３が、突起部２２が形成されている上面側ではなく、下面側に形成されているので、溝５３内にごみ等の異物が堆積しにくく、また洗浄時の水が溜まらないので黴が生じず衛生的であり、食品の計量等の用途に特に適している。 A bellows 13d used in an electronic balance 1 according to a fifth embodiment of the present invention will be described with reference to FIG. Other configurations of the electronic balance 1 are the same as those in the first embodiment.
As shown in FIG. 10, the bellows 13 d is formed with a groove 53 having a U-shaped cross section on the back side of the first fixing portion 18 in the vicinity of the protrusion 22 and the engagement protrusion 21. Since the groove 53 is formed not on the upper surface side where the protrusions 22 are formed but on the lower surface side, foreign substances such as dust are less likely to accumulate in the groove 53, and water is not collected during cleaning. It does not occur and is hygienic and is particularly suitable for applications such as food weighing.

本発明の第６実施形態に係る電子秤１に用いられるジャバラ１３ｅを図１１を参照して説明する。電子秤１のその他の構成は第１実施形態と同一である。
図１１に示すように、このジャバラ１３ｅは、第１固定部１８の表側と裏側の両方に、突起部２２に近接して幅狭の溝６３ａ，６３ｂがそれぞれ形成されている。溝６３ａ，６３ｂが、第１固定部１８の両面に形成されているので、第１固定部１８はクランク状の断面となり、有害な応力や変形の伝達を一層効果的に遮断することができる。 A bellows 13e used in an electronic balance 1 according to a sixth embodiment of the present invention will be described with reference to FIG. Other configurations of the electronic balance 1 are the same as those in the first embodiment.
As shown in FIG. 11, the bellows 13 e is formed with narrow grooves 63 a and 63 b in the vicinity of the protrusion 22 on both the front side and the back side of the first fixing portion 18. Since the grooves 63a and 63b are formed on both surfaces of the first fixing portion 18, the first fixing portion 18 has a crank-shaped cross section, and can effectively block transmission of harmful stress and deformation.

本発明の第７実施形態に係る電子秤１に用いられるジャバラ１３ｆを図１２を参照して説明する。電子秤１のその他の構成は第１実施形態と同一である。
図１２に示すように、このジャバラ１３ｆは、第１固定部１８の表側と裏側の両方に、それぞれ２本ずつの溝７３ａ，ｃ及び７３ｂ，ｄが互い違いになるように交互に形成されている。このような構成によれば、第６実施形態に比べ、有害な応力や変形の伝達をさらに一層効果的に遮断することができる。 A bellows 13f used in an electronic balance 1 according to a seventh embodiment of the present invention will be described with reference to FIG. Other configurations of the electronic balance 1 are the same as those in the first embodiment.
As shown in FIG. 12, the bellows 13f are alternately formed on the front side and the back side of the first fixing portion 18 so that two grooves 73a, c and 73b, d are alternately arranged. . According to such a configuration, it is possible to more effectively block transmission of harmful stress and deformation as compared with the sixth embodiment.

本発明の第８実施形態に係る電子秤１に用いられるジャバラ１３ｇを図１３を参照して説明する。電子秤１のその他の構成は第１実施形態と同一である。
図１３に示すように、このジャバラ１３ｇは、筐体７側に固定される下側の第２固定部１９の下面に、突起部２５に近接して溝８３が形成されている。このような構成によれば、第２固定部１９と可変形部２０との間における有害な応力や変形の伝達を効果的に遮断することができる。 A bellows 13g used in an electronic balance 1 according to an eighth embodiment of the present invention will be described with reference to FIG. Other configurations of the electronic balance 1 are the same as those in the first embodiment.
As shown in FIG. 13, the bellows 13 g has a groove 83 formed in the lower surface of the lower second fixing portion 19 that is fixed to the housing 7, close to the protruding portion 25. According to such a configuration, transmission of harmful stress and deformation between the second fixed portion 19 and the deformable portion 20 can be effectively blocked.

本発明の第９実施形態に係る電子秤１に用いられるジャバラ１３ｈを図１４を参照して説明する。電子秤１のその他の構成は第１実施形態と同一である。
図１４に示すように、このジャバラ１３ｈは、筐体７側に固定される下側の第２固定部１９の上面に、突起部２５に近接して溝９３が形成されている。このような構成によれば、第２固定部１９と可変形部２０との間における有害な応力や変形の伝達を効果的に遮断することができる。 A bellows 13h used in an electronic balance 1 according to a ninth embodiment of the present invention will be described with reference to FIG. Other configurations of the electronic balance 1 are the same as those in the first embodiment.
As shown in FIG. 14, the bellows 13 h has a groove 93 formed on the upper surface of the lower second fixing portion 19 that is fixed to the housing 7 in the vicinity of the protruding portion 25. According to such a configuration, transmission of harmful stress and deformation between the second fixed portion 19 and the deformable portion 20 can be effectively blocked.

なお、以上説明した各実施形態において、第１又は第２固定部１８，１９に形成された突起部２２，２５は、第１又は第２固定部１８，１９の表面から突出した断面半球形の周状の凸条であったが、突起部２２，２５の形状としてはこれに限定するものではなく、第１又は第２固定部１８，１９の表面との間に高さの違いが認められるような部分であって、固定時に負荷側部材又は非負荷側部材に押し付けられて圧縮され、潰されることにより、防水・防塵等の機能を発揮しうるような部位であればよく、例えば単なる肉厚部乃至段差部のような構造であっても本発明における突起部の定義に含まれるものとする。 In each of the embodiments described above, the protrusions 22 and 25 formed on the first or second fixing portion 18 and 19 have a hemispherical cross section that protrudes from the surface of the first or second fixing portion 18 and 19. Although it was a circumferential ridge, the shape of the protrusions 22 and 25 is not limited to this, and a difference in height between the surfaces of the first or second fixing portions 18 and 19 is recognized. It may be any part that can exert functions such as waterproofing and dustproofing by being pressed against a load side member or a non-load side member during compression and being compressed and crushed. Even a structure such as a thick part or a step part is included in the definition of the protrusion in the present invention.

１…電子秤
３…負荷側部材としてのロバーバル機構
６…負荷側部材としての荷重受け部材
７…非負荷側部材としての筐体
８…負荷側部材としての受け部
１１…負荷側部材としてのジャバラ受け
１３，１３ａ，１３ｂ，１３ｃ，１３ｄ，１３ｅ，１３ｆ，１３ｇ，１３ｈ…分離部材としてのジャバラ
１８…ジャバラの第１固定部
１９…ジャバラの第２固定部
２０…ジャバラの可変形部
２２…第１固定部の突起部
２５…第２固定部の突起部
２３，３３，４３，５３，６３，７３，８３，９３…溝 DESCRIPTION OF SYMBOLS 1 ... Electronic scale 3 ... Roberval mechanism as a load side member 6 ... Load receiving member as a load side member 7 ... Housing as a non-load side member 8 ... Receiving part as a load side member 11 ... Bellows as a load side member Receiving members 13, 13a, 13b, 13c, 13d, 13e, 13f, 13g, 13h ... bellows as separating members 18 ... first fixing portion of bellows 19 ... second fixing portion of bellows 20 ... deformable portion of bellows 22 ... first 1 fixed portion protrusion 25 ... second fixed portion protrusion 23, 33, 43, 53, 63, 73, 83, 93 ... groove

Claims

A load side member (6, 8, 11) to which the load of the object to be weighed is applied;
A non-load side member (7) for accommodating at least a part of the load side member therein;
First fixing portion of the relatively thick having a circumferential protrusion that is fixed in a state of being compressed (22) in contact with the side of the load-side member (18), the non-load-side member circumferential projections that are fixed in a state of being compressed in contact with the second fixed portion of the relatively thick having a (25) and (19), wherein the second fixing portion and the first fixing portion the circumferential and a separation member (13) having a deformable portion of the relatively thin to connect monolithically (20), at least one of the second fixing portion and the first fixing portion, in the electronic balance (1) that forms the shape of the grooves (23,33,43,53,63,73,83,93) of the adjacent circumferential to said projections,
The diameter of the protrusion (22) provided on the first fixing part (18) and the diameter of the protrusion (25) provided on the second fixing part (19) are different from each other, and the load side member (11) and the non-load-side member (7) are fixed to each other with equal force, and the first fixing portion and the second fixing portion have the protruding portion having a small diameter. An electronic balance (1), wherein the groove is formed .

It said groove (53,63,73,93), an electronic scale according to claim 1, characterized in that it is formed on the surface opposite to the side where the protrusions (22, 25) is formed .