CN1337569A

CN1337569A - Balance with load sensing device having stopper mechanism

Info

Publication number: CN1337569A
Application number: CN 01124580
Authority: CN
Inventors: 小西孝
Original assignee: Tanita Corp
Current assignee: Tanita Corp
Priority date: 2000-08-09
Filing date: 2001-08-09
Publication date: 2002-02-27
Anticipated expiration: 2021-08-09
Also published as: TW507066B; CN1175256C

Abstract

A balance of the present invention includes a load sensing device having a distortion body which deforms in response to a load, a fixed-side member which is attached to a fixed side of the distortion body and detects the load, and a movable-side member which is attached to a movable side of the distortion body and detects the load, wherein the load sensing device has a stopper function of restricting vertical movements of the fixed-side member and the movable-side member.

Description

Have the scale of the load-weight sensing device of band stop mechanism

Technical field

The present invention relates to have the scale of the load-weight sensing device of being with stop mechanism.

Background technology

In scale, load cell is one of weight detecting mechanism.The characteristic of the straining body that this load cell utilization and weight are out of shape with being directly proportional, from the electric signal of the corresponding sensor of deflection of straining body, calculate gravimetric value.This straining body is accurate parts, has some loadings just to produce distortion slightly, and this distortion is passed to sensor.

But, in the use of scale, used rambunctiously sometimes, for example catch the scale pan sharply up to start etc.When deliberately starting the falling of the scale pan or scale, its impulsive force makes the straining body plastic yield and returns less than original shape such.Perhaps, the weight of measuring has sometimes surpassed the rated weight of scale.For this reason, in order to make that straining body is also indeformable when thump or g-load recast are used on the scale, below the movable side of straining body, be provided as the screw of stop part, straining body contacts with screw, the excessive change of restriction straining body.Perhaps, at base part rib is set, when having served as load effect, straining body and this ribbed joint touch.

In addition, as the weight detecting mechanism of scale, the testing agency of electrostatic capacity type is arranged also.This testing agency utilizes the elastomeric characteristic of the leaf spring that is out of shape with weight or straining body etc. with being directly proportional, according to elastomeric deflection, from the electric signal of electrostatic capacity type sensing device, calculates gravimetric value.The electrostatic capacity type sensing device portion that this elastic body or battery lead plate constitute is accurate parts, and the just distortion of some weight of elastomer is arranged slightly, detects this weight, and along with elastomeric distortion, battery lead plate also changes at interval.

But when scale fell, its impulsive force caused the battery lead plate plastic yield and returns less than original shape.Even do not fall, but impacted in transportation, battery lead plate also can shake sometimes.When these accidents of generation, even without loading, the electrode interbody spacer also produces big variation, in weighing thereafter, can show inaccurate loading value, perhaps at all can not weighing.During the thin thickness of battery lead plate, be easy to generate plastic yield, so consider the thickening battery lead plate, can improve the intensity of battery lead plate itself, still, if battery lead plate is thickeied, weight also increases, and the impact when falling is then bigger.When meeting with the impact that surpasses the electrode material limit of elasticity, produce plastic yield, so do not take this method usually.For this reason, indeformable in order when running into thump, to make battery lead plate, below battery lead plate, be provided as the protuberance of stop part from base portion, battery lead plate contacts with this protuberance, can limit the excessive change of battery lead plate.Perhaps, also can below battery lead plate, paste the impact absorption material of rubber material or sponge etc., can relax the impact of g-load recast time spent.

Above-mentioned employing stops in the method for straining body excessive deformation as the screw of stop part, and component number increases, and wants the adjusting screw height, makes straining body change in the scope that can measure loading, prevents loading, so the adjusting operation of screw is miscellaneous.

In addition, the above-mentioned rib that is provided with on pedestal stops in the structure of straining body excessive deformation, and the gap between the rib of sensing device and base portion must be accurately, when making the parts such as primary screw of base component, sensing device, connection base portion, must the accurate dimensions precision.But usually, base portion is a resin forming product, and warpage and inclination easily is so the interval instability of protuberance and sensing device must confirm whether to have carried out accurate face processing during assembling.

In addition, in the structure that protuberance stops the battery lead plate excessive deformation in the electrostatic capacity type sensing device is set by base portion, the gap of sensing device and base portion protuberance must be accurately, making base component, need the accurate dimensions precision with sensing device, when being connected the parts such as primary screw of base portion.But as previously mentioned, base portion is a resin forming product usually, easily warpage.Therefore, the interval instability of protuberance and sensing device must confirm whether to have carried out accurate face processing during assembling.

In addition, above-mentionedly below battery lead plate, paste rubber material or sponge, stop the method for battery lead plate excessive deformation, need the sticking operation of trouble.

Summary of the invention

The present invention makes in view of the above problems, and its purpose is to provide a kind of scale that has the load-weight sensing device of band stop mechanism.

The scale of the application's the 1st invention is characterised in that, have load-weight sensing device, this load-weight sensing device has straining body according to loading distortion, is installed in the fixation side of this straining body and is used to detect the fixation side parts of loading and is installed in the movable side of this straining body and is used to detect the movable side component of loading; This load-weight sensing device has and limits these fixation side parts and movable side component towards the backstop action of upper and lower to change.

The scale of the application's the 2nd invention is characterised in that, have the load-weight sensing device of band stop mechanism, load-weight sensing device have according to be placed on straining body that the weight of object on the scale pan is out of shape, a sensor of exporting with the corresponding electric signal of the deflection of straining body, be connected straining body and the scale pan scale pan supporting plate, be connected the straining body anchor clamps of straining body and base part;

This load-weight sensing device has stop mechanism, this stop mechanism, when crossing loading or uplift force and affact on the straining body more than the rated weight, the part of scale pan supporting plate contacts with the part of an askew anchor clamps, the change of straining body is limited within the specific limits, prevent the distortion of straining body.

The electrostatic capacity type scale of the application's the 3rd invention is characterised in that, have load-weight sensing device, this load-weight sensing device has elastic body that an end is fixed on the Luo Baiwaer mechanism on the base portion, by this elastomeric distortion and the pair of electrodes plate of interval variation, the 1st battery lead plate in the pair of electrodes plate, be installed in elastomeric fixation side, the 2nd battery lead plate is installed in elastomeric movable side;

In elastomeric fixation side, be provided with the backstop of restriction the 2nd battery lead plate change, in elastomeric movable side, be provided with the backstop of restriction the 1st battery lead plate change.

As the further improvement of the 3rd invention, be located at the backstop of elastic body fixation side, contact with the free end of the 2nd battery lead plate and limit change; Be located at the backstop of the movable side of elastic body, contact with the free end of the 1st battery lead plate and limit change.

Description of drawings

Fig. 1 is the planimetric map of the scale inside of one embodiment of the invention.

Fig. 2 is the A-A line sectional drawing of scale shown in Figure 1.

Fig. 3 is the B-B line sectional drawing of scale shown in Figure 1.

Fig. 4 is the outboard profile of the sensing device portion of scale shown in Figure 1.

Fig. 5 is the figure of the inboard of sensing device shown in Figure 4 portion.

Fig. 6 is the front view (FV) and the outboard profile of a kind of spacer used in scale shown in Figure 1.

Fig. 7 is the front view (FV) and the outboard profile of another kind of spacer used in scale shown in Figure 1.

Fig. 8 is the planimetric map of the sensing device in another embodiment of the present invention.

Fig. 9 is the outboard profile of sensing device shown in Figure 8.

Figure 10 is the back view of sensing device shown in Figure 8.

Figure 11 is the planimetric map of the sensing device among another embodiment.

Figure 12 is the A-A line sectional drawing of sensing device shown in Figure 11.

Figure 13 is the B-B back view of sensing device shown in Figure 11.

Figure 14 is the planimetric map of the sensing device in another embodiment of the present invention.

Figure 15 is the A-A line sectional drawing of sensing device shown in Figure 14.

Figure 16 is the B-B line sectional drawing of sensing device shown in Figure 14.

Figure 17 is the back view of sensing device shown in Figure 14.

The specific embodiment

Below, with reference to the description of drawings embodiments of the invention.

Fig. 1 is in the circular electrostatic capacity type scale of employing stop mechanism of the present invention, and expression will The scale pan (this scale pan is used for placing the object of wanting weighing) takes off the scale inside of state, namely mensuration is heavy The sensing device section of amount and the plane of synthetic resin base portion processed. Fig. 2 is the A-A line of Fig. 1 Sectional drawing, Fig. 3 are the B-B line sectional drawings of Fig. 1, and Fig. 4 only takes off sensing device section state Side view, Fig. 5 is the inside figure of sensing device section.

As shown in these figures, elastomer is to adopt the straining body 1, with Luo Baiwaer mechanism End (supporting frame side) passes through straining body anchor clamps 2, is fixed on from pedestal 3 with primary screw 4 and stretches out Rib 3A on; The other end (movable frame side) becomes the structure that floats from pedestal 3. Rise askew The bottom of body 1 is

spacer

5A, 5B, 5C, 5D by insulator, is provided with as sensor Pair of

electrodes plate

6,7. Below the supporting frame side of straining body 1, holding successively spacer 5A, solid under the arm Fixed plate 6, spacer 5B, and fix with 2 primary screw 10B. Being installed with in the movable frame side can Movable plate electrode 7, but should movable plate electrode 7 with fixed polar plate 6 in opposite directions and be parallel to each other. At straining body 1 The movable frame side below, but holding successively spacer 5C movable plate electrode 7, spacer 5D under the arm, little with 2 Screw 10A fixes. Load-weight sensing device becomes by the elasticity of the straining body 1 that causes with loading But shape is corresponding, the polar plate spacing of fixed polar plate 6 and movable plate electrode 7 from change, output and lotus Heavy corresponding signal.

On straining body 1, be installed with for the scale that scale pan (not shown) is installed with primary screw 9 Pan arrest plate 8 at the notch portion 8C of this scale pan supporting plate 8, embeds the pawl that is formed on scale pan dorsal part The leader of section.

Scale pan supporting plate 8 stretches out towards the supporting frame direction along straining body 1, forms in the above pushing and ends Stopper 8A, manner stopper 8B on two sides form, manner stopper 8B and pushing backstop on this Some interval slightly between the 8A of section. In the gap of this pushing stopper section 8A and upper manner stopper 8B, Leave the circumference 2A that holds under the arm with gap into straining body anchor clamps 2.

Fig. 6 is the figure of spacer 5A, and Fig. 6 (a) is front elevation, and Fig. 6 (b) is from the side Figure. Spacer 5A is insulator, is resin forming product, is formed with 2 screw through-hole 51. Spacer 5D too.

Fig. 7 is the figure of spacer 5B, and Fig. 7 (a) is front elevation, and Fig. 7 (b) is from the side Figure. Spacer 5B is insulator, is resin forming product, is formed with 2 screw through-hole 52. At its edge, be provided with the protuberance 53 as the backstop of battery lead plate. Spacer 5C too.

The following describes the action of the scale of the present invention of above-mentioned structure. The object of wanting weighing is put into figure not After showing on the scale pan, its weight transmitting is to scale pan supporting plate 8. Because the supporting frame side of straining body 1 is solid Fix on the pedestal, so only the movable frame side descends because of weight, movable electrode plate 7 also thereupon Descend. Like this, but the expansion of the interval of fixed polar plate 6 and movable plate electrode 7, two interelectrode static Volume change. By this variation, vibration frequency also changes, so, be transformed to loading value, will The weight of object is presented on the display part. Circuit structure in this electrostatic capacity type scale is known, Its explanation is omitted. At this moment, if the weight of the object on the scale pan in rated weight, scale pan holder The pushing stopper section 8A of plate 8 does not contact with the circumference 2A of straining body anchor clamps 2, but movable plate electrode 7 do not contact with the protuberance 53 of spacer 5B yet.

When the object that surpasses rated weight has been placed on the scale pan, the pushing backstop of scale pan supporting plate 8 The 8A of section contacts with the circumference 2A of straining body anchor clamps 2, sustains the weight above rated weight. Like this, the change of the movable frame side of straining body 1 is suppressed, and straining body 1 can not continue change.

When starting the scale pan, the movable frame side of straining body 1 also rises, the upper manner of scale pan supporting plate Stopper 8B contacts with the circumference 2B of straining body anchor clamps 2, can not continue change again. Owing to establish Put this pushing stopper section 8A and upper manner stopper 8B, so, in common overload or lift When playing the scale pan, stress is not applied on the

battery lead plate

6,7.

Below, the electrostatic capacity type scale with this sensing device section is described, when scale falls Situation. Because straining body 1 is fixed on the rib 3A of base portion 3, so, common supporting frame side Do not produce big change. And the movable frame side is not owing to being fixed on the pedestal, so easily change. But pushing stopper section 8A contacts with the circumference 2A of straining body anchor clamps 2, so straining body 1 change is limited. At this moment, the movable electrode 7 that is fixed on the movable frame side of straining body 1 holds Easily change, take the position of being held under the arm by

spacer

5C, 5D as fulcrum, acting on should towards the warpage of downside Power. But, but because the protuberance of movable plate electrode 7 contacts institute with the protuberance 53 of spacer 5B With, warping stress no longer further acts on the battery lead plate, can be suppressed in the elastic limit. Gu Fixed plate 6 is also owing to below it is tight but movable plate electrode 7 being arranged, so be not easy to produce plastic deformation.

Behind the effect of stress of below, as its counter-force, towards the effect of stress of top to scale On. At this moment, fixed polar plate 6, take the position of being held under the arm by

spacer

5A, 5B as fulcrum, warpage should Masterpiece is used in upside. But the protuberance 54 of the protuberance of fixed polar plate 6 and spacer 5C connects Touch. On battery lead plate, do not act on bigger warping stress, can be suppressed in the elastic limit.

Like this, the limiting structure of the battery lead plate according to the present invention in the electrostatic capacity type scale is for lower The stress of direction or upper direction can both be protected, and can suppress the plastic deformation of battery lead plate.

In addition, according to this structure, during with automaton assembling sensing device section, can be from upper set Fill each parts, in addition, when being fixed on scale pan supporting plate on the straining body, also can install from the top, As long as transverse direction a little movement can assemble, can assemble simply the sensing with stop mechanism Device.

The 2nd embodiment of the present invention such as Fig. 8 are to shown in Figure 10. The sensing that has only represented scale among the figure Device section. Fig. 8 is plane, and Fig. 9 is side view, and Figure 10 is back view.

Bottom, two sides at the scale pan supporting plate 18 that connects straining body 11 and the scale pan forms L shaped Protuberance 18A, in the gap of this side and L shaped protuberance 18A, form projection 12A. Should Projection 12A is formed on the two sides of the straining body anchor clamps 12 that connect straining body 11 and pedestal. Should Among the embodiment, when the object that surpasses rated weight is placed on the scale pan, projection 12A and scale pan holder Bottom, the side contact of plate 18, in addition, when starting the scale pan, projection 12A and L shaped protuberance The top contact of 18A. Like this, served as the regulation masterpiece times spent in addition such as loading and upper act, can Suppress the change of straining body 11.

The 3rd embodiment of the present invention such as Figure 11 are to shown in Figure 13. Among the figure, only represent the biography of scale Induction device section. Figure 11 is plane, and Figure 12 is the A-A line sectional drawing of Figure 11, Figure 13 It is the B-B back view of Fig. 11.

In the bottom, two sides of the scale pan supporting plate 28 that connects straining body 21 and the scale pan, form towards propping up The protuberance 28A that support frame section prolongs. On the straining body anchor clamps 22 that connect straining body and pedestal, Form rectangular hole 22A. The protuberance 28A of scale pan supporting plate 28 holds under the arm in the 22A of this hole, and is logical Often, when the mensuration of rated weight, they do not contact.

Among this embodiment, when the object that surpasses rated weight is placed on the scale pan, scale pan supporting plate 28 Protuberance 28A contact with the following of hole 22A of straining body anchor clamps 22, in addition, when picking up scale During dish, protuberance 28A contacts with the top of hole 22A. Like this, cross the regulations such as loading and upper act The masterpiece time spent in addition, can suppress the change of straining body.

The 4th embodiment of the present invention such as Figure 14 are to shown in Figure 17. Among the figure, only represented scale Sensing device section. Figure 14 is plane, and Figure 15 is the A-A sectional drawing of Figure 14, Figure 16 It is the B-B line sectional drawing of Figure 14. Figure 17 is back view.

Limiting structure among the 4th embodiment, substantially identical with the 3rd embodiment, its difference Connecting the two sides of straining body 31 with the scale pan supporting plate 38 of the scale pan, to prolong towards the supporting frame side The formation position difference of long protuberance 38A. At the straining body anchor clamps that connect straining body and pedestal On 32, form rectangular hole 32A. The protuberance 38A of scale pan supporting plate 38 holds under the arm into this hole 32A In, usually, when the mensuration of rated weight, they do not contact.

Among this embodiment, when the object that surpasses rated weight is placed on the scale pan, scale pan supporting plate 38 Protuberance 38A contact with the following of hole 32A of straining body anchor clamps 32, when picking up the scale pan, Protuberance 38A contacts with the top of hole 32A. Like this, served as like this regulation of loading and upper act The masterpiece time spent, can suppress the change of straining body.

Above, as embodiments of the invention, several sensing device section has been described. They are equal By connecting the scale pan supporting plate of straining body with the scale pan, being connected the straining body anchor clamps of straining body and base portion Consist of the structure that embeds for the part of the part of scale pan supporting plate and straining body anchor clamps. Served as When above effect of stress is stipulated in loading and upper act etc., this embedded part contact, straining body can not Continue again distortion.

Here the kind of said sensor is the electrostatic capacity type sensing that adopts the pair of electrodes plate Device. But be not limited to this, the present invention also is applicable to the load cell formula scale that adopts deformeter.

In addition, the elastomer in above-described embodiment is the electrostatic capacity type that adopts straining body, but Be not limited to this, the present invention also is suitable for the scale of leaf spring as elastomeric sensor.

In addition, the shape of spacer also is not limited to the shape among the embodiment, can according to elastomer and The size shape of battery lead plate is done suitable design alteration.

The stop mechanism of the sensing device section according to the present invention in the scale, when acted on cross loading or on During the lifting force iso-stress, the scale pan supporting plate that connects the scale pan and straining body be connected straining body and pedestal The straining body anchor clamps contact of section like this, can limit the distortion of straining body, so, needn't arrange Special parts can prevent the permanent deformation of straining body.

In addition, the stop mechanism of the sensing device section according to the present invention in the scale, as sensor Among the pair of electrodes plate, the 1st electrode is installed in elastomeric fixation side, and the 2nd electrode is installed in Elastomeric drawer at movable side in elastomeric fixation side, arranges ending of restriction the 2nd battery lead plate change Stopper at elastomeric drawer at movable side, limits the change of the 1st battery lead plate, falls etc. when having acted on During stress, only slightly change, the stopper section contacts with battery lead plate, so, can limit battery lead plate Change like this, needn't arrange the plastic deformation that special parts just can prevent battery lead plate.

In addition, in according to the present invention for the countermeasure of crossing loading and uplift force with for falling Countermeasure, each parts in the sensing device section are to adopt aluminium, iron, so can be processed into high size Precision, only sensing device section gets final product countermeasure, and this countermeasure needn't be regulated parts, and labor content is also Reduce.

In addition, the structure according to the 1st invention for detection of the parts of loading, also has conduct concurrently The effect of stop part is so the change that can prevent from stipulating above above-below direction prevents zero one The number of packages order increases.

In addition, according to the structure of the 3rd invention, can be with the stopper section restriction for the change of impacting Amount is the change of the free end of maximum battery lead plate, so, the free end of battery lead plate and ending The gap of stopper can admit of big error, so the making of load-weight sensing device is easy.

Claims

1. scale, it is characterized in that, have load-weight sensing device, this load-weight sensing device has straining body according to loading distortion, is installed in the fixation side of this straining body and is used to detect the fixation side parts of loading and is installed in the movable side of this straining body and is used to detect the movable side component of loading; This load-weight sensing device has and limits these fixation side parts and movable side component towards the backstop action of upper and lower to change.

2. scale, it is characterized in that, have the load-weight sensing device of band stop mechanism, load-weight sensing device have according to be placed on straining body that the weight of object on the scale pan is out of shape, a sensor of exporting with the corresponding electric signal of the deflection of straining body, be connected straining body and the scale pan scale pan supporting plate, be connected the straining body anchor clamps of straining body and base part;

3. electrostatic capacity type scale, it is characterized in that, have load-weight sensing device, this load-weight sensing device has elastic body that an end is fixed on the Luo Baiwaer mechanism on the base portion, by this elastomeric distortion and the pair of electrodes plate of interval variation, the 1st battery lead plate in the pair of electrodes plate, be installed in elastomeric fixation side, the 2nd battery lead plate is installed in elastomeric movable side;

4. electrostatic capacity type scale as claimed in claim 3 is characterized in that, is located at the backstop of elastic body fixation side, contacts with the free end of the 2nd battery lead plate and limits change; Be located at the backstop of the movable side of elastic body, contact with the free end of the 1st battery lead plate and limit change.