JPS6217683Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a strap-type indicating instrument, and more specifically, to an improvement of its boss member.

In the strap-type indicating instrument, as shown in FIG. 1, only one side of the moving coil 2 wound around a rectangular frame 1 is shown for convenience, but in reality is rotatably suspended within a magnetic gap formed between a cylindrical magnet 4 and a ring-shaped yoke 5 disposed around the cylindrical magnet 4 by a pair of tension bands 3 disposed coaxially above and below. held. In this case, the movable coil 2 generally has a boss member 6 fixed on its rotation axis C.
The tension band 3 is attached to the boss member 6. That is, as shown in FIG. 2, the boss member 6 includes a substrate 7 formed to be placed on the moving coil 2, and
It consists of a cylindrical boss body 8 planted on top,
This boss body 8 is provided with a slit groove 9 formed vertically along an imaginary vertical plane including the rotation axis C. The boss body 8 has a through hole 10 bored perpendicularly to the slit groove 9, and a pin member 11 inserted into the through hole 10 and driven into the slit groove 9. wedge member 12
The tension belt 3 is held between the two. In this case, the through hole 10 is a small hole of about 0.5φ formed to tightly receive the pin member 11, and its center point aligns the tension band 3 with the rotation axis C of the moving coil 2. Due to the relationship, the pin member 1 is
It is provided at a position shifted by a radius of 1. However, such a conventional boss structure has a drawback in that when the pointer support plate 13 is attached to the boss member 6, it is difficult to determine the direction in which it should be attached, which often leads to mistakes. That is, after the pointer support plate 13 is fitted into the boss body 8 and adhered to the base plate 7, the wedge member 12 is driven into the slit groove 9 to fix the tension band 3, and its free end is attached to the pointer support plate 13. Soldering is done at a predetermined location on the rear part, but in this conventional example, the driving direction of the wedge member 12 is limited, and the free end of the tension band 3 can only be pulled out from one side of the slit groove 9. ,
This is because the mounting direction of the pointer support plate 13 must be determined after confirming the drawing direction.
In addition, when drilling a 0.5φ through hole 10 in the boss body 8, the drill is likely to be misaligned because the center of the hole is not at the center of the cylindrical part of the boss body. Extremely advanced processing technology is required. On the other hand, as described above, since the direction in which the wedge member 12 is driven is limited, an automatic parts alignment and supply device cannot be used, and there are also problems in terms of productivity.

This invention was made with the aim of solving the above-mentioned drawbacks of the conventional device, and an embodiment thereof will be described in detail below with reference to FIGS. 3 to 6. In addition, in these figures, the same reference numerals are used for parts corresponding to the parts described above, and detailed description is omitted.

The strap-type indicating instrument according to this invention is equipped with a boss member 31 illustrated in FIGS. 3 to 5.
The boss member 31 includes a substrate 7, a cylindrical boss body 8 implanted on the substrate 7, and a slit groove formed in the vertical direction along a vertical plane including the rotation axis C of the movable coil 2. 9, but in this case, the boss body 8 has grooves perpendicular to the slit grooves 9,
A through hole 32 having a center line intersecting the rotation axis C and having a perfect circular cross section is bored. This through hole 32 has a diameter sufficiently larger than that of the pin member 11 inserted therein.
is fixed in the through hole 32 by a wedge member 33 driven into the slit groove 9 with the tension band 3 attached to its outer periphery. That is, as shown in FIG. 6, the through hole 32 is formed of a perfect circular hole having a diameter approximately twice the diameter of the pin member 11, and is preferably formed within an imaginary sector divided into four equal parts. It has a diameter large enough to accommodate the pin member 11 almost internally therein. On the other hand, the wedge member 33 includes an inclined wall 34 that intersects the rotation axis C at a predetermined angle. Therefore, when the wedge member 33 is driven into the slit groove 9, the pin member 11 is pushed into the through hole 32 by the wedge action of the inclined wall 34.
and is firmly fixed at a position shifted by the radius from the rotation axis C, and
The tension band 3 attached to the outer periphery of the pin member 1
1 and the inclined wall 34, and is positioned coaxially with respect to the rotation axis C of the movable coil 2. Note that even if the wedge member 33 is driven into the slit groove 9 from the opposite side from the illustrated embodiment, the tension band 3
is similarly positioned on the axis of rotation C. Of course, in this case, the tension band 3 would be attached to the pin member 11 from the direction opposite to that of the illustrated embodiment, and its free end would be led out from the right side of the slit groove 9 in FIG. Note that the diameter of the through hole 32 is determined by the relative relationship with the diameter of the pin member 11 as described above, but in reality, the diameter of the through hole 32 is determined by the thickness of the tension band 3 (approximately
0.1~0.15mm) will also be considered.

As is clear from the above description of the embodiment, according to this invention, no matter which direction the wedge member 33 is driven into the slit groove 9, the tension band 3 remains coaxial with the rotation axis C of the moving coil 2. Therefore, the pointer support plate 13 can be freely adhesively fixed on the boss member 31 without checking the direction in which it is attached. The wedge member 33 may be driven into the slit groove 9 from a predetermined direction. Therefore, the installation work of the pointer support plate 13 is greatly simplified and is extremely practical. In addition, since the through hole 32 is sufficiently larger than the conventional through hole 10 and is located on the diameter line of the cylindrical portion of the boss body 8, the hole can be easily drilled, and the pin member 11 may be slightly damaged. Even if there is a burr, the through hole 3
It is convenient because it can be inserted into 2. On the other hand, since there is no restriction on the direction in which the wedge member 33 is driven, the boss member 31 can be supplied to a predetermined work location by the parts automatic alignment and supply device, thereby improving productivity.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a main part of a conventional general strap-type indicating instrument, Fig. 2 is a perspective view of its boss member, and Fig. 3 is a boss member of a tension-type indicating instrument according to this invention. Fig. 4 - Sectional view along the line, No. 4
The figure is a plan view, FIG. 5 is a perspective view, and FIG. 6 is an enlarged view of the main part of the boss member. In the figure, 2 is a moving coil, 3 is a tension band, 9 is a slit groove, 11 is a pin member, 31 is a boss member, 32 is a through hole, 33 is a wedge member, 34 is an inclined wall, and C is the rotation axis of the moving coil. It is.

Claims (1)

[Claims for Utility Model Registration] A movable part including a movable coil, a pair of boss members mounted on the rotational axis of the movable part, and a rotatable suspension of the movable part via these boss members. each boss member has a slit groove formed along an imaginary vertical plane including the rotation axis and a through hole perpendicular to the slit groove; A pin member is inserted into the through hole, a wedge member that acts toward the pin member is driven into the slit groove, and the tension is maintained between the pin member and the wedge member. In a tension band type indicator formed by holding one end of a band, the through hole has a central axis perpendicular to the rotational axis of the movable part, and has a size approximately twice as large as the diameter of the pin member. Consists of a perfect circular hole formed in the
The pin member is biased to a predetermined position within the circular hole by a wedge member driven into the slit groove,
The tension strap type indicator is characterized in that the tension strap is held between the pin member and the wedge member so as to be positioned on the rotation axis of the movable part.