JPH0452663Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a string vibrator used in a string vibrating force detector that vibrates in response to applied force. This invention relates to a structure of a string vibrator that prevents twisting.

[Prior art]

As a string vibration type force detector, for example,
There was something like the one disclosed in Publication No. 131131. Since this is basically the same as that shown in FIG. 8, its basic structure will be explained based on FIG. In the same figure, 2 is the main elastic body,
Reference numeral 4 denotes secondary elastic bodies, which extend horizontally and in parallel from a substantially rigid base 6. Both elastic bodies 2,
A string vibrating body 8 is stretched between the ends of the string vibrating body 8 so as to bend the auxiliary elastic body 4 to some extent, that is, to apply a slight initial tension to the string vibrating body 8. Main elastic body 2
For example, a mounting plate 10 is connected to the plate 10 for applying a load thereto. 12 is a magnetic pole for applying a magnetic field to the string vibrating body 8 in a direction perpendicular to its length direction. The string vibrating body 8 is an amplifier circuit (not shown)
It is connected to the input and output sides of the oscillator, and together they form an oscillator.

In this string vibrating force detector, the string vibrating body 8 vibrates at a frequency of ₀ , which is proportional to the square root of the initial tension. Tension and initial tension are added,
The vibrating body 8 vibrates at a frequency ₁ proportional to the square root of the sum of these tensions. Therefore, it is possible to measure the frequency ₀ in advance from the output signal of the oscillator, measure ₁ when the article is placed on it, and find the weight of the article from the difference between ^2/0 and ^2/1 .

The string vibrating body 8 is attached to the auxiliary elastic body 4 as shown in FIG. 9, for example. As shown in FIG. 10, plate-shaped mounting portions 14 are integrally formed at both ends of the string vibrating body 8, and each mounting portion is provided with an insertion hole 16 for a mounting bolt. .
Reference numeral 17 indicates a portion that becomes a pressing surface when the string vibrating body 8 is attached. As shown in FIG. 9, a fixed part 18 is attached to the tip of the auxiliary elastic body 4 by, for example, a screw 19, and the mounting part 14 of the string vibrating body 8 is attached to the body part 20 of this fixed part 18. The insertion hole 16 is fitted, and the annular holding surface 17 on one side of the mounting part 14 is connected to the annular protrusion 2 provided on the base 22 of the fixing part 18.
It is in contact with 4. A presser member 26 is also inserted through the body portion 20 , and an annular protrusion 28 provided thereon is in contact with an annular presser surface on the other side of the attachment portion 14 . The disc spring 30 is inserted into the body 20, and the body 20 is inserted into the body 20.
The attachment portion 24 is attached to the auxiliary elastic body 4 by screwing and tightening a nut 34 onto a bolt 32 provided at the tip. The mounting portion 14 on the other side of the string vibrating body 8 is attached to the main elastic body 2 in exactly the same manner as described above.

[Problem that the invention attempts to solve]

As mentioned above, the string vibrating body 8 is finally connected to the nut 3.
4, and when tightening, a suitable jig is used to fix the holding member 26 of the string vibrating body so that it does not move. However, if the presser member 26 is not securely fixed with the jig,
When the nut 34 is tightened, the holding member 26 rotates,
The string vibrating body 8 is fixed with the string vibrating body mounting portion 14 twisted in the direction of the arrow 33 as shown in FIG. If the string vibrating body 8 is fixed in a twisted state, even if the twist is slight, the accuracy of the string vibrating force detector will be significantly reduced. However, it is extremely difficult to visually detect the twist of the string vibrating body 8, and for this reason, it may not be possible to remove a poorly installed string vibrating body before assembling the entire device.

[Means for solving problems]

This idea prevents twisting from occurring when tightening the nut even if the holding of the holding member 26 by the jig is somewhat uncertain when installing the string vibrator, and even if twisting occurs, it can be easily detected. The purpose of the present invention is to provide a string vibrating body that can perform

The string vibrating body according to this invention has a vibrating string and a plate-shaped mounting portion provided at each end of the vibrating string and having a mounting insertion hole, and further includes a vibrating string on both sides of the vibrating string. A torsion prevention beam is integrally provided in parallel with the plate-shaped mounting portions to connect the plate-shaped mounting portions. After the string vibrating body is attached to the fixing portions of the main elastic body and the sub elastic body, the torsion prevention beam is cut and removed at both ends thereof, that is, at the connection portion with the plate-like attachment portion.

As an embodiment of the string vibrating body of this invention, the connecting part between the beam and the plate-shaped attachment part is made particularly thin to make it easy to cut, and one or more small holes are drilled along the planned cutting point. There are some that have been set up, especially those that have been thinned out.

[Action/Effect]

According to this invention, when attaching the string vibrating body to the fixed part 18, the action of the jig is incomplete and the holding member 26
Even if the mounting part of the string vibrating body attempts to rotate in the direction of rotation of the pressing member, the torsion prevention beam acts to prevent the rotation, and the mounting part
It can prevent twisting as shown in the figure.
Further, if the mounting portion were to be twisted, the twist prevention beams on both sides of the vibrating string would not be on the same plane, so that a defective product can be easily found by looking at the string vibrating body from the side.

Furthermore, the structure of the string vibrator of this invention is simple, and the torsion prevention beam after installation can be easily cut off with nippers or scissors, making it easy to assemble. This can be provided at low cost.

〔Example〕

FIG. 1 shows a first embodiment of a string vibrating body 35 of this invention, in which mounting portions 14 in which insertion holes 16 are formed are provided at both ends of a vibrating string 36.
Torsion prevention beams 38, 38 are integrally formed with the vibrating string 36 and the mounting portion 14 in parallel on both sides of the vibrating string 36.

In this string vibrator, even if a rotational force in the direction indicated by arrow Fa is applied due to the rotation of the presser member 26 when tightening with a nut, the rotational force Fa in the direction opposite to the above rotational force Fa as indicated by arrow Fb is applied to the torsion prevention beam 38. Due to the force acting on the vibrating string 3 as shown in Figure 11,
8 can be prevented from twisting. Also, if twisting occurs,
Since the vibrating string 36 and the anti-torsion beams 38, 38 are no longer on the same plane, defective installation can be easily discovered when looking at the string vibrator from the side, and defective fittings can be removed before assembling the entire device. I can do it.

After attaching the string vibrating body 35, a normal string vibrating force detector is obtained by cutting the string vibrating body 35 at positions 40, 40, . . . with nippers, scissors, or the like.

FIG. 2 shows a second embodiment of the string vibrating body 35 of this invention, in which small holes 42, 4
2 is drilled to make it easier to cut. When cutting the anti-twist beam 38, the portion 44 may be cut first, and the cut portion 40 in which the small hole 42 is formed may be bent and removed.

FIG. 3 shows a third embodiment of the string vibrating body of this invention, in which a notch 46 is formed in the cutting part 40.
Its operation is similar to the embodiment of FIG.

FIG. 4 shows a fourth embodiment of the string vibrating body of this invention, in which notches 48 and 50 are formed in the cutting section 40.

FIG. 5 shows a fifth embodiment of the string vibrating body of this invention, in which a plurality of small holes 52, 52 are bored in the form of perforations along the cut portion 40.

FIG. 6 shows a sixth embodiment of the string vibrating body of this invention, in which a groove 54 is formed on one side of the cutting portion 40 and that portion is made thinner.

FIG. 7 shows a seventh embodiment of the string vibrating body of this invention, in which grooves 56, 56 are formed on both sides of the cut portion 40 to make it thinner.

Each of the embodiments shown in FIGS. 4 to 7 can prevent the vibrating string 36 from twisting during installation due to the action of the anti-twist beam 38, as in the embodiment shown in FIG. 38 can be easily cut out. In addition to the above-mentioned embodiments, for example, two torsion prevention beams may be provided on each side of the vibrating string 36, and in addition, the beams have the function of preventing the vibrating string 36 from being twisted when the string vibrating body 35 is attached. Moreover, any structure can be used as long as the anti-torsion beam 38 can be easily cut after installation.

[Brief explanation of the drawing]

Fig. 1 is a front view of the first embodiment of the string vibrating body according to this invention, Fig. 2 is a front view of the second embodiment, and Fig. 3 is a front view of the torsion prevention beam and the mounting part of the third embodiment. Fig. 4 is an enlarged view of the connection between the torsion prevention beam and the mounting part of the fourth embodiment, and Fig. 5 is an enlarged view of the connection between the torsion prevention beam and the mounting part of the fifth embodiment. FIG. 6 is an enlarged view of the connection between the torsion prevention beam and the attachment part of the sixth embodiment, and FIG. 7 is an enlarged view of the connection between the torsion prevention beam and the attachment part of the seventh embodiment. Enlarged view,
Fig. 8 is a front view showing the schematic configuration of a string vibration type force detector, Fig. 9 is a partially omitted vertical sectional view showing the structure of the mounting part of the string vibrator, and Fig. 10 is a front view of a conventional string vibrator. , FIG. 11 is a front view showing a torsional state that may occur when a conventional string vibrator is installed. 14... Mounting part, 35... String vibrator, 36...
Vibrating string, 38...Twist prevention beam, 40...Cutting portion, 42...Small hole, 46, 48, 50...Notch, 52...Small hole, 54, 56...Groove.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A vibrating string, a plate-shaped mounting portion provided at each end of the vibrating string, and having a mounting insertion hole formed therein;
A string vibrating body integrally configured with torsion prevention beams disposed on both sides of the vibrating string in parallel with the vibrating string, each end of which is connected to the mounting portion, the string vibrating body is operated by a string vibrating force. A string vibrator that is used by cutting off both ends of the anti-twisting beam and removing the anti-twisting beam from the mounting portion after being attached to a predetermined position of the detector. (2) The string vibrating body according to claim 1 of the utility model registration, characterized in that at least one small hole is bored along the cutting position at both ends of the torsion prevention beam to facilitate cutting. . (3) The string vibrating body according to claim 1, which is a utility model registration, characterized in that notches are formed at the cutting positions at both ends of the torsion prevention beam to facilitate cutting. (4) The string vibrating body according to claim 1 of the utility model registration, characterized in that a groove is formed on at least one surface of the torsion prevention beam along the cutting position at both ends thereof to facilitate cutting. .