JP2533886Y2 - Electronic scale beam wire fixing device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load transmission mechanism in an electromagnetic balance type electronic balance, and more particularly to a wire fixing structure for transmitting a load of a weighed object to a beam of a load measurement mechanism.

[0002]

2. Description of the Related Art An electronic balance, which is an electromagnetic balance type electronic balance,
In principle, a very small amount can be measured among the scales in principle, but it is necessary to give various considerations to the mechanism in order to actually realize the small amount measurement.

FIG. 6 shows a mechanism for transmitting a load of a weighing object to a beam of an electronic balance.

An arrow 50 indicates a beam forming a part of the load measuring mechanism of the electronic balance. Reference numeral 51 denotes a load transmitting mechanism for transmitting the load of the weighed object to the beam 50. The load applied to the load transmitting mechanism 51 is balanced by the electromagnetic unit 56 to measure the weight of the weighed object. 52 is a mounting member for connecting the load transmitting mechanism to the beam 50 side, 53
Is a weight locking member connected to the mounting member 52,
The inner copper 55 is configured to be added to and removed from the arms 53a, 53a that are symmetrically formed and formed, and a hook 53a is provided at a lower portion. A weighing dish 54 is locked to the hook 53a. ing. This load transmitting member 51
The connection between the beam and the beam 50 is made through a thin wire of metal (usually platinum) so that even a very small weight can be accurately transmitted to the beam 50 side.

[0005] That is, approximately V toward the upper part of the mounting member 52.
A pair of mounting member side arms 52a, 5a
A thin metal wire (load line) 57 extends between 2a. On the other hand, a pair of beam-side arms 50 extended in a substantially Y-shape
A support wire 58 made of a thin wire made of the same material as the load wire 57 is extended between a and 50a. These load lines 57
And the support wire 58 are fixed by a mounting plate 59 so as to be orthogonal to each other at the center of each other.

By using such a fine wire, it is possible to absorb a shock such as a swing of the weighing dish 54 or a drop of the weighing object on the weighing dish 54 by a deformation such as twisting, expansion and contraction of these fine wires. Thus, care is taken so that only the weight of the weighed object is accurately transmitted to the beam 50.

[0007]

FIGS. 7 and 8 show a state in which the load line 57 and the support line 58 are fixed to each other by a mounting plate 59. FIG.

First, these fine metal wires made of platinum or the like are extremely thin in order to be able to absorb fluctuations or the like by their own deformation. For example, the width W of the load wire 57 and the width W of the support wire 58 is small.
1 and W2 are each about 0.2 mm, thickness D1, D2
2 is extremely fine, about 0.02 mm. Therefore, the fixing plate as a member for fixing the load line 57 and the support line 58 is also small, and the fixing operation requires skill and meticulous attention in order to fix the fine member in a predetermined position.

The fixed plate 59 has a flat rectangular upper plate 59a,
The upper plate 59a and the lower plate 59b are applied from above and below at an orthogonal portion of the load line 57 and the support line 58, and in this state, the four corners of the upper plate 59a and the lower plate 59b are formed. Are screwed together with small bolts 60 to clamp and fix the orthogonal portion between the upper and lower plates. in this case,
The bolts 60 used for mounting are very fine bolts having a diameter of about 1 mm or less. To properly screw them into the mounting plate 59 requires skill and meticulous attention, and quick assembly of the weighing device is required. It is one of the factors that hinder the transition.

When tightening each bolt 60, the load line 5
There is a possibility that the mounting plate 59 is shifted with respect to the portion where the support wire 7 and the support wire 58 are connected, or the mounting itself between the load wire 57 and the support wire 58 is shifted and the accuracy of the scale is reduced. . Here, among the surfaces of the upper plate 59a and the lower plate 59b, grooves corresponding to these wires are formed on the respective opposing surfaces that sandwich the wires, and the wires are stored in these grooves so that the mounting position of the wires is set. However, the thickness of the wire is extremely thin as described above, and it is extremely difficult to form a groove corresponding to this thickness. On the other hand, if the groove is too shallow, it will be difficult to arrange the wire at a predetermined position. On the other hand, if it is too deep, the wire will move in the groove even if the upper and lower plates are fixed, and the fixing becomes uncertain.

Further, if the tightening of the bolts is not uniform, stress will remain on the load line and the support line in this mounting portion, and as a result, the accuracy of the scale may also be reduced.

[0012]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has a guide groove formed in a plane cross shape with respect to an integrally formed fixing member. A pressing member is provided at the orthogonal portion of the guide groove and screwed to the fixing member. The pressing member fixes the load line and the supporting line by pressing.

[0013]

The load line and the support line are respectively disposed in the guide grooves of the fixed member. A press-contact member is screwed into the guide groove orthogonal portion, and by tightening the press-contact member, the load line and the support line are pressed and fixed around the orthogonal portion by a guide groove while maintaining a perfect orthogonal state.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the drawings.

FIGS. 1 to 3 show a first embodiment of the present invention.

The arrow 1 indicates the load line 57 and the support line 5 described above.
8 is a fixing member for fixing the load line 2 and the support line 3 similar to 8 and is integrally formed of a metal material such as stainless steel. Guide grooves 1a and 1b are formed so as to be orthogonal to the fixing member 1, and both grooves 1a and 1b intersect at the center of the fixing member 1, and a screw groove is formed at the intersection. As a result, a female screw portion 1c is formed. Reference numeral 4 denotes a bolt as a wire rod pressing means which is screwed with the female screw portion 1c of the fixing member 1. The diameter d of the bolt 4 is about 3 mm to 4 mm when the load line 2 and the support line 3 to be fixed have substantially the same thickness and width as the load line 57 and the support line 58 shown in FIGS. It can be made relatively large and easy to operate. 5a and 5b
Is a member (hereinafter referred to as 5) interposed between the fixing member 1 and the bolt 4 when the load line 2 and the support line 3 are fixed by the bolt 4.
a is referred to as an "upper interposed member" and 5b is referred to as a "lower interposed member". I have.

In the above configuration, the load line 2 and the support line 3
In fixing the fixing member 1, first, the fixing member 1 in a state where the lower intervening member 5 b is housed in the guide grooves 1 a and 1 b is positioned below the intersection of the load line 2 and the support line 3, and in this state, the fixing member 1 , The load line 2 is positioned in the guide groove 1b, and the support line 3 is positioned in the guide groove 1a. In this state, the upper interposed piece 5a is housed in the guide groove of the fixing member 1, and the bolt 4 is screwed into the female screw portion 1c. Thus, the load line 2 and the support line 3 are pressed and held by the bolt 4 and the bottom of the guide groove of the fixing member 1 via the upper and lower intervening members 5a and 5b (see FIG. 3).

At the time of this fixing operation, since the number of the bolts 4 is one and relatively large, the turning operation of the bolts 4 is easy and no special skill is required. When the bolt 4 is rotated, the load line 2 and the support line 3 are respectively connected to the guide grooves 1a.
And 1b, so no misalignment occurs.
It will be fixed to each other at the correct position. In addition, as shown in FIG. 3, since it is pressed and fixed around the intersection between the load line 2 and the support line 3 which need to be most firmly fixed, there is a possibility that both wires 2 and 3 may be misaligned after being fixed. Very low compared to technology.

The bolt 4 as the fixing means may be, for example, an embedded bolt 6 as shown in FIG. 2B in addition to that shown in FIG. In the figure, reference numeral 6a denotes a buried type bolt 6.
A groove for turning a bolt recessed at the top of the groove.
A wrench (not shown) is engaged with a, and the bolt 6 is turned to be fixed to the fixing member 1.

FIGS. 4 and 5 show a second embodiment.

First, in this embodiment, the cross-shaped central portions of the upper and lower intervening members 5a and 5b are large area portions 5a 'and 5b' close to the planar shape of the female screw portion 1c.
By increasing the pressure contact area at the intersection with the support wire 3 and the support wire 3, these wires are more securely fixed.

Reference numeral 7 denotes a spacer piece interposed between the intersection of the load line 2 and the support wire 3 and the upper interposed piece 5a, which is formed into substantially the same shape as the upper interposed piece 5a. I have. The spacer piece 7 is formed of a material softer than the intervening pieces 5a and 5b, and is deformed to some extent by the pressing force when pressed by the bolt 4. As a result, the adhesion between the upper interposed piece 5a having a step as shown in FIG. 5 due to the intersection of the two wires 2 and 3 is improved,
Try to provide higher fixation (see FIG. 5). The intervening member is made of a metal such as gold and is soft and does not rust. However, when oxidized, the weight of the metal material changes, so that the accurate weight of the object to be measured cannot be measured. Although one spacer piece 7 is used in the configuration shown in the drawing, another similar spacer piece is formed, and this is arranged between the lower interposition piece 5b and each of the wires 2 and 3 so as to fill the lower step. If this is done, the fixing will be more secure.

FIG. 9 shows a jig for mounting the above-mentioned fixing member.

Although the above-mentioned members can be attached without using a jig, the attachment can be performed more easily by using the following jig.

Reference numeral 8 denotes a mounting jig, which comprises an engaging portion 8a for engaging with the fixing member 1 and a gripping portion 8b for holding the entire jig. An engagement groove 8c having a shape equal to the planar shape of the fixing member 1 (octagon in the illustrated configuration) is formed in the engagement portion 8a. In mounting the fixing member 1, first, the fixing member 1 is engaged and placed in the engaging groove 8 c of the jig 8, and the fixing member 1 is disposed at the intersection of the load line 2 and the support line 3 with the grip portion 8 b. The jig 8 is lifted so that the load line 2 and the support line 3 are accommodated in the guide groove, and then the bolt 4 is rotationally fixed with the other hand (the right hand in the case of right-handed). If this jig is used, the hand of the worker does not come into contact with these thin metal wires when the fixing member 1 is attached, and it is also possible to avoid the situation where the thin wires are bent or sweat or the like adheres to the thin wires during work. Workability is further improved.

[0026]

[Effects of the Invention] The present invention has been described in detail above.
Since the load line and the embodiment can be securely fixed with one relatively large bolt, skill is not required and the operation time can be considerably shortened as compared with the case where a plurality of fine bolts are attached.

Further, since the load line and the support line to be fixed are accommodated in the guide grooves of the fixing member, there is no possibility that these wires are displaced during the fixing operation, and it is easy to maintain the accuracy of the scale high.

Further, since the fixing is performed mainly at the intersection of the load line and the supporting line, which is the part to be most strongly fixed, various kinds of fixing can be maintained over a long period of time. It is effective.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a fixing member according to the present invention.

FIG. 2A is a perspective view of a fixing member showing a mounting state of the fixing member shown in FIG. 1 with respect to a load line and a support line,
(B) is a perspective view of an embedded bolt.

FIG. 3 is a cross-sectional view taken along line AA of FIG.

FIG. 4 is an exploded perspective view of a fixing member according to a second embodiment.

FIG. 5 is a sectional view of the fixing member of FIG. 4;

FIG. 6 is a perspective view of the beam and the load transmitting mechanism showing a connection state between the beam and the load transmitting mechanism.

FIG. 7 is an exploded perspective view of a conventional fixing member.

FIG. 8 is a perspective view of the fixing member shown in FIG. 7;

FIG. 9 is a partial perspective view of a jig for attaching the fixing member according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixing member 1a, 1b Guide groove 1c Female thread part 2 Load line 3 Supporting line 4 Bolt 5a Upper interposed piece 5b Lower interposed piece 6 Embedded bolt 7 Spacer piece 8 Fixing member mounting jig 50 Beam 51 Load transmission mechanism

Claims (3)

(57) [Scope of request for utility model registration] A load transmission member is provided by orthogonally intersecting a support wire, which is a wire rod extended on a beam of an electronic balance, and a load wire, which is a wire rod extended on a load transmission mechanism, and connecting and fixing both wires at the orthogonal portion. Is configured to transmit the load of the weighing object to the beam side through these wires, and includes a fixing member and pressing means screwed to the fixing member, and the fixing member has approximately two guide grooves. The guide groove is formed so as to be orthogonal at the center, and at the intersection of the guide grooves, a female screw portion with which the pressing means is screwed is formed. The load line accommodated in the guide groove by screwing the pressing means with the female screw portion A wire fixing device for an electronic weighing beam, wherein the supporting wire is sandwiched and fixed between the pressing means and the fixing member. 2. A pair of upper and lower interposed pieces formed in a substantially cross shape substantially equal to the planar shape of the guide groove are interposed between the wire and the bottom of the guide groove and between the pressing means and the wire, respectively. 2. The wire fixing device for an electronic scale beam according to claim 1, wherein: 3. A spacer piece made of a material softer than the interposed pieces is disposed between at least one of the upper interposed piece and the wire or between the lower interposed piece and the wire. Or the electronic scale beam fixing device according to 2.