JP2758530B2 - Electronic scales - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic balance in which a receiving portion is connected to a movable portion of a load cell in which a fixed portion is connected to a main body housing.

[0002]

2. Description of the Related Art At present, an electronic balance for calculating the weight of an article as electrical data has been put to practical use. The electronic scale is a bridge-connected strain gauge in which a fixed end of a load cell stuck to a strain generating portion is connected to a main body housing and a movable end is connected to a tray, and the weight of articles loaded on the tray is Thus, the amount of strain generated in the load cell is electrically measured with a strain gauge to perform measurement.

A conventional example of such an electronic balance will be described with reference to FIG. First, in the electronic balance 1, a main body housing (not shown) is formed in a box shape having an open top, and a bottom plate 2 of the main body housing is formed.
A bolt hole 4 which is two screw holes is formed on the upper surface of the spacer 3 fixed to the spacer 3. The load cell 5 of the electronic balance 1 is formed in a horizontally elongated rectangular parallelepiped shape, and four strain gauges 6 are adhered to the upper and lower surfaces of a strain generating portion. Are formed, and two bolt holes 10 are formed in the upper surface of the movable end 9. Further, the tray 11 of the electronic balance 1 is formed in a shape that shields an upper opening of the main body housing, and two through holes 13 are formed in a bottom surface of a concave portion 12 formed in a substantially central portion of an upper surface thereof. ing. Therefore, in the electronic balance 1, the bolt 14 inserted from above into the through hole 8 of the fixed end 7 of the load cell 5 is fastened to the bolt hole 4 of the bottom plate 2 of the main body housing, and the through hole 1 of the pan 11 is
3 is inserted into the movable end 9 of the load cell 5.
The receiving pan 11 is supported by the movable end 9 of the load cell 5 having the fixed end 7 fixed to the main body housing.

With such a configuration, in the electronic balance 1, when a strain is generated in the strain-generating portion of the load cell 5 corresponding to the weight of the weighing object (not shown) loaded on the tray 11, the strain is caused together with the strain-generating portion. The weight is electrically calculated from a change in the resistance value of the strain gauge 6 that causes distortion. Here, the electronic balance 1 has a structure in which the bolt 14 for fixing the load cell 5 to the main body housing and the bolt 15 for fixing the pan 11 to the load cell 5 are both inserted from above, thereby improving workability during assembly. Let me.

[0005]

The above-described electronic balance 1 has a structure in which the bolts 14 and 15 for connecting the main body housing, the load cell 5 and the tray 11 are inserted from above in order to improve the assemblability. .

Further, in this electronic balance 1, a through hole 8 is formed in the fixed end 7 of the load cell 5 and a bolt hole 10 is formed in the upper surface of the movable end 9, so that the shape is symmetrical in the vertical and horizontal directions. The actual load cell 5 is actually asymmetrical, and the direction tends to be confused at the time of manufacture or assembly, which hinders productivity. Further, in the electronic balance 1, since the bolts 14 for fixing the load cell 5 to the main body housing are shielded by the pan 11, the bolts 14 cannot be attached or detached when the pan 11 is mounted on the load cell 5.
Its maintainability and assemblability are hindered.

[0007]

According to the present invention, there is provided an electronic balance in which a tray is connected to a movable end of a load cell and a fixed end is connected to a main body housing. Forming a hole in the body
A convex portion on the pan located above the top plate of the housing
A screw hole that does not reach the upper surface is formed on the lower surface of the projection , a through hole is formed at the fixed end and the movable end of the load cell, and the load cell is formed inside the main body housing.
Each screw of said screw which is inserted from below into each of the through hole and the body housing pan of a fixed end and a movable end of the load cell as well as arranged by positioning the Le
Screw the load cell into the body housing
Fixed concatenates the pan to the load cell.

[0008]

[Function] Since screws and through-holes are not exposed on the upper surface of the pan, it can be used for weighing objects that produce water droplets.
Since the load cell can form the through-holes of the fixed end and the movable end in the same manner and can be symmetrical in the upper, lower, left and right directions, it is possible to improve the workability at the time of manufacturing and assembling. Both the screw for fixing the load cell to the main body housing and the screw for fixing the pan to the load cell can be exposed in the bottom opening of the main body housing, so that these screws can be freely attached and detached without limiting the order. This can contribute to improvement in maintainability and assemblability.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. First, in a postage scale 16 which is an electronic scale, as illustrated in FIG. 1, a main body housing 17 is formed in a box shape with an open lower surface, and a through hole 19 is formed on the left side of a top plate 18. A bolt hole (not shown), which is two screw holes, is formed on the lower surface of the projection 20 projecting rightward from the lower surface of the top plate 18. The load cell 21 of the postage scale 16 is formed in a horizontally elongated rectangular parallelepiped shape, and four strain gauges (not shown) are attached to the upper and lower surfaces of the strain generating portion. Movable end 23
Are formed with two through holes (not shown). Further, a plastic tray 24 of the postage scale 16 is provided.
Are formed in the shape of a flat plate having substantially the same shape as the top plate 18 of the main body housing 17, and two screw holes (bolt holes (not shown)) are formed on the lower surface of the convex portion 25 projecting leftward from the lower surface. ) Is formed. Therefore, in the postage scale 16, bolts 26 and 27, which are screws inserted from below into the through holes of the fixed end 22 and the movable end 23 of the load cell 21, are connected to the bolt holes of the main body housing 17 and the pan 24. Respectively, the movable end 23 of the load cell 21 in which the fixed end 22 is fixed to the main body housing 17,
4 are supported.

Further, in the electronic balance 1, as shown in FIG. 2, a display 28 and a keyboard 29 are provided on the front surface of the main body housing 17, and as shown in FIG. Is composed of a type key 30, a content key 31, a print key 32, a ten key 33, and the like. Further, in the electronic balance 1, the display 28 is formed by a segment display 34 for numbers and a dot matrix display 35 for characters, and the display 28 and the keyboard 29 are formed.
And the strain gauge of the load cell 21 is a CPU
(Central Processing Unit) or the like (not shown).

In such a configuration, when the postage scale 16 is distorted in the strain generating portion of the load cell 21 in accordance with the weight of the postal matter (not shown), which is the weighing object loaded on the receiving pan 24, The arithmetic processing circuit electrically calculates the weight from the change in the resistance value of the strain gauge that causes a strain together with the strain generating portion.

Then, in the postage scale 16, the numerical value of the weight is displayed on the segment display 34, and a guide message such as "Schwetzky @ Oshitekidasai" is displayed on the dot matrix display 35. When the operator operates the type key 30 corresponding to the type of the mail, the postage scale 16 which has detected this input displays a guide message "NYO KEY @ POSITIVE" on the dot matrix display 35. In other words, in the postage scale 16, when the postal matter is weighed, the guide message of the key operation required next is sequentially displayed on the dot matrix display 35, so that the postage calculation of the postal matter and the attachment to the postal matter are performed. The setting of the contents of the label to be performed is performed very easily. Therefore, as described above, the operator who has entered the contents of the mail by various key operations of the postage scale 16 is referred to as "ENTER".
When the "R" key is operated, the postage is displayed on the dot matrix display 35 in response to this input. In addition, the postage scale 16 displays the guide message as described above and then displays the postage. The key group to be operated blinks, and among these blinking keys, the operated one is fixedly turned on and the others are turned off. To display the guide message,
In addition to the fixed display, blinking display, scroll display, and the like can be performed.

Here, in the postage scale 16, bolts 26 for fixing the load cell 21 to the main body housing 17 are provided.
And a bolt 27 for fixing the tray 24 to the load cell 21 so as to be inserted from below, thereby improving workability during assembly. By doing so, the postage scale 16 is structurally provided with a bolt 27
Because the through holes and the through holes are not exposed, for example, a weighing object that produces water droplets can be easily weighed.

In the postage scale 16, the load cell 21 has a structure in which through holes are formed in both the fixed end 22 and the movable end 23 in the same manner. Since there is no need to limit the direction during manufacture or assembly, it is possible to contribute to improvement in productivity. Further, in the postage scale 16, the load cell 2
1 and the pan 2 for fixing the base 1 to the main body housing 17
Since the bolts 27 for fixing the bolts 4 to the load cell 21 are both exposed in the bottom opening of the main body housing 17, these bolts 26, 27 can be freely attached and detached without limiting the order, and their maintenance is easy. And extremely good assemblability.

Although the postage scale 16 has been described as an example of the electronic balance here, the present invention is not limited to the above-mentioned type, but can be applied to various electronic balances. Further, the screw referred to in the present invention means a fastening member having a screw-shaped shaft portion and a head that is operated to rotate, which is a hexagon bolt, an Allen key bolt, a Phillips screw,
It contains a flathead screw and the like.

[0016]

As described above, the present invention relates to an electronic balance in which a receiving tray is connected to a movable end of a load cell and a fixed end is connected to a main body housing. Form a screw hole on the lower surface of
The receptacle located above the top plate of the main body housing
A convex portion is formed on the plate, a screw hole that does not reach the upper surface is formed on the lower surface of the convex portion , a through hole is formed at a fixed end and a movable end of the load cell, and the through hole is formed inside the main body housing.
It with the load cell <br/> le of the fixed end and said each of the through holes the screws inserted from below and the body housing pan with movable end while arranged by positioning the load cell
Screwed into the screw hole to connect the load cell to the main body housing.
By fixing the Managing and consolidated the pan to the load cell, the screw is not exposed on the upper surface of the structurally pan, also,
The through hole in the main unit housing is
Weighing objects that produce water droplets, etc.
Through the screw hole inside the main body housing, or
Water droplets hardly enter through the through-holes, and the load cell can be formed in the same way at the fixed end and the movable end to have a symmetrical shape at the top, bottom, left and right. Workability can be improved, and
Each of the screws fixing the load cell, the main body housing and the pan can be exposed in the bottom opening of the main body housing, so that these screws can be freely attached and detached without restricting the order of the maintenance and the ease of maintenance and assembly. This has the effect of being able to contribute to the improvement of

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an embodiment of the present invention.

FIG. 2 is a perspective view.

FIG. 3 is an enlarged front view showing an essential part.

FIG. 4 is a longitudinal sectional side view showing a main part of a conventional example.

[Explanation of symbols]

 16 Electronic balance 17 Main body housing 18 Top plate 21 Load cell 22 Fixed end 23 Movable end 24 Receiving pan 26, 27 Screw

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G01G 3/12-3/14 G01G 21/23

Claims (1)

(57) [Claims] 1. An electronic balance in which a tray is connected to a movable end of a load cell and a fixed end is connected to a main body housing, wherein the main body housing is formed to have an open bottom, and a screw hole is formed in a lower surface of a top plate. , Of the body housing
A convex portion is formed on the pan located above the top plate, and
Form a screw hole that does not reach the upper surface on the lower surface of the convex part of
Forming a through hole at the fixed end and the movable end of the load cell,
Position the load cell inside the body housing
Screwed into each screw hole of the said screw which is inserted from below into each of the through hole and the body housing pan of a fixed end and a movable end of the load cell as well as arranged Te
And fix the load cell to the main body housing.
Electronic scales being characterized in that concatenates the pan to Doseru.