JPH035850Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a zero adjustment device for a meter such as a wide-angle meter in which the movable element axis and the rotation center of the zero adjustment device are concentric.

FIG. 1 is an explanatory diagram of the main part of a wide-angle meter using a conventional meter zero adjustment device. FIG. 2 is a view seen from the direction of arrow A in FIG. In these figures, 10 is a front cover of the meter, 20 is a zero adjustment device, and 30 is a zero adjustment mechanism of the meter internal device. The front cover 10 is made of transparent plastic, and a spiral serration 11 is formed on the back side of the central portion, and this serration is semitransparent. This notch is formed to hide the zero adjustment mechanism 30 portion of the instrument internal device from being seen from the outside of the cover 10.

In the zero adjustment device 20, 21 is a zero adjustment element;
22 is a disc spring, and 23 is a U-shaped engagement piece made of metal. The zero adjustment element 21 is inserted into the through hole 12 formed in the center of the cover 10, and the engagement piece 23 is fitted from the back side of the cover via the disc spring 22, so that the engagement piece and the tip 24 of the zero adjustment element 21 are connected to each other. The engaging piece 23 is attached to the zero adjustment element 21 by ultrasonic welding (plastic welding) or by caulking the engaging piece 23. Thus, the zero adjustment element 21 is crimped and fixed to the cover 10 so as to be rotatable.

In the instrument zero adjustment mechanism 30, 31 is a boss stopper. The boss stopper 31 is composed of a cylindrical body with a T-shaped cross section, and notches 32 and 33 are formed in both arms in the length direction. Both legs of the engagement piece 23 of the zero position adjustment device 20 are engaged with the notches 32 and 33.
The boss stopper 31 has its body 34 rotatably crimped and fixed to a fixing member 35 of the instrument internal device.
36 is a protrusion, which is provided on the fixing member 35. 40 is a moving coil, a pointer, etc. (both not shown)
41 is a tension spring attached to the top of the boss stopper 31; 42 is a tension band whose one end is attached to the tension spring 41 and the other end is attached to the boss 40 of the movable element; be.

When a current to be measured is supplied to the movable coil, the movable element including the movable coil, the pointer, the movable part boss 40, etc. rotates about the tension band 42 as an axis. The zero position adjustment device 20 is arranged so that its center of rotation is concentric with the tension band 42 which is the movable element axis, and both legs of the engagement piece 23 are aligned with the notch 3 of the boss stopper 31.
2 and 33. Thus, when the zero adjustment element 21 is rotated, the engagement piece 23 attached to this element is rotated. This causes the boss stopper 31 to rotate, displacing the mechanical position of the pointer of the meter, and adjusting its zero position.

By adjusting the zero position in this way, the boss stopper 31
When a part of the boss comes into contact with the projection 36, the boss stopper 31
The rotation of is regulated. Thereby, the twisting of the tension band 42 is suppressed to a certain amount or less.

However, such a zero position adjustment device for a meter has the following problems.

When looking at the meter from the front, the left side is 0%, the right side is 100%, and the pointer generally swings from the left to the right. In order to accommodate the custom order of a meter in which the pointer swings in the opposite direction, that is, the pointer swings from the right side to the left side (hereinafter referred to as a reverse swing meter), the protrusion 36 is cut and the boss stopper 31 is It is necessary to rotate the 0% position to bring it to the right side, and to attach the movable element in the opposite direction when attaching the tension band 42. For this reason, there was a problem in that it was difficult to manufacture a meter with reverse swing.

The present invention has been made in order to eliminate the above-mentioned problems, and it is an object of the present invention to provide a zero position adjustment device for a meter that can easily produce a meter with reverse swing.

FIG. 3 is a diagram showing the structure of one embodiment of the zero position adjustment device for a meter according to the present invention, and here, the case where it is used in a wide angle meter is illustrated. FIG. 4 is a view seen from the direction of arrow B in FIG. In these figures, the same parts as in FIG. 1 are given the same reference numerals. The same applies to the figures below.

In these figures, 50 is the zero position adjustment device of the meter. A protrusion 1 is provided on the inner surface of the instrument cover 10.
3 is provided. In the instrument zero position adjustment device 50, 51 is a zero adjuster, and 52 is a zero arm. Zero adjuster 51 and zero arm 52
A zero-tune element is constructed by. Regarding these zero adjuster 51 and zero arm 52,
The configuration will be explained using the diagram and FIG.

FIG. 5 is a diagram showing the configuration of the zero adjuster 51, in which A is a top view and B is a sectional view taken along the line C-C' in A. In the zero adjuster 51, 53
is the head, on one side of which a diametrical groove 54 is formed. 55 is the leg part, 2 of 55 ₁ and 55 ₂
A book is provided. These legs 55 ₁ , 55 ₂
extends toward the other side of the head 53 and has elasticity. At the tips of the legs 55 ₁ and 55 ₂ , outwardly directed claws 56 ₁ and 56 ₂ are formed, respectively. The zero adjuster 51 is integrally formed, for example, with a plastic mold.

FIG. 6 is a diagram showing the configuration of the zero arm 52, in which A is a top view and B is a sectional view taken along line D-D' in A. In the zero arm 52, 57 is a disk portion. This disc portion 57 is provided with an oval hole 58 and a circumferential groove 59. Reference numeral 60 denotes an engaging portion, for example, an engaging leg extending in one side direction, and two of them, 60 ₁ and 60 ₂ are provided. zero arm 52
are integrally formed by plastic molding.

Returning again to FIGS. 3 and 4, the assembled state of the zero adjuster 51 and zero arm 52 will be described.

The leg portions 55 ₁ and 55 ₂ of the zero adjuster 51 pass through the through hole 12, and the claw portions 56 ₁ and 56 ₂ protrude from the cover 10. Claw portions 56 ₁ , 56 ₂
is engaged in the oval hole 58. The zero adjuster 51 is attached to and detached from the zero arm 52 using the leg portion 55.
This is done in a snap-fit style with an elasticity _{of 1,552} . As a result, the zero adjuster 51 and the zero arm 52 sandwich the cover 10, and the zero adjuster 51 and the zero arm 52 are attached to the cover 10 so as to be rotatable together. In this state, the protrusion 13 is in the groove 5.
The rotation range of the zero adjuster 51 and the zero arm 52 is restricted by the projection 13 and the groove 59. The instrument zero position adjustment device is arranged so that its center of rotation is concentric with the tension band 42, which is the movable element axis, and its engagement leg 6
0 ₁ , 60 ₂ are the notches 32 and 3 of the boss stopper 31
3.

In a wide-angle instrument with such a configuration, the groove 5
Insert a driver etc. into the zero adjuster 51.
When rotated, the legs 55 ₁ and 55 ₂ hit the side of the oval hole 58 and the rotation is transmitted, and the zero arm 52
The zero adjuster 51 also rotates together with the zero adjuster 51. As a result, the boss stopper 31 of the instrument internal unit rotates,
The mechanical position of the pointer is displaced to adjust its zero position.

By adjusting the zero position in this way, the protrusion 13 is aligned with the groove 59.
By hitting both ends of the boss stopper 31
The rotation of is regulated. Thereby, the twisting of the tension band 42 can be suppressed to a certain amount or less. According to the standard, the adjustable angle of the zero position of the pointer is 2 of the full scale.
It is at an angle of ~10%. Therefore, the length of the groove 59 is set so that the zero position of the pointer can be adjusted within such an angular range.

According to the instrument zero position adjustment device having such a configuration, since the fixing member 35 of the instrument inner device is not provided with a protrusion, the notches 32, 3 of the boss stopper 31
When the engagement legs 60 ₁ and 60 ₂ are not engaged with the boss stopper 31, the boss stopper 31 can be freely rotated. From this, it is possible to easily manufacture a meter with reverse swing even after the internal instrument is installed. In addition, since the rotation range of the zero adjustment element 50 is restricted by the protrusion 13 provided on the cover 10 of the instrument and the groove 59 provided with the zero arm 52, it can be easily adjusted without adding new parts. The rotation range of the zero adjustment element can be restricted by the configuration.

FIG. 7 is a diagram showing the configuration of another embodiment of the zero position adjustment device for a meter according to the present invention.

In FIG. 7, a gasket 61 is inserted into a groove 62 provided on the lower surface of the head 53.

According to the instrument zero adjustment device having such a configuration, in addition to the effects obtained by the instrument zero adjustment device shown in FIG. It can be done.

In addition, although the case where the zero position adjustment device of a meter is used for a wide-angle type meter was described in the embodiment, the zero position adjustment device for a meter may be used for other meters.

Further, in the embodiment, a protrusion 13 is provided on the cover 10 of the meter.
Although a case has been described in which the zero arm 52 is provided with a groove 59, the present invention is not limited to this, and the instrument cover 10 may be provided with a groove and the zero arm 52 may be provided with a protrusion.

In addition, in the embodiment, the zero adjustment element is the zero adjuster 5.
1 and zero arm 52, the zero adjustment element may have a configuration other than this.

As explained above, according to the present invention, it is possible to provide a zero position adjustment device for a meter that can easily produce a meter with reverse swing.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram of the main parts of a wide-angle meter using a conventional meter zero adjustment device, and Figure 2 is a
FIG. 3 is a diagram showing the configuration of an embodiment of the instrument zero adjustment device according to the present invention, and FIG. 4 is a diagram viewed from the direction of arrow B in FIG. 3. ,
Figure 5 is a diagram showing the configuration of the zero adjuster in Figure 3, A is a top view, B is a cross-sectional view of the C-C' portion of A, and Figure 6 is a diagram showing the configuration of the zero arm in Figure 3. FIG. 7 is a top view, FIG. 7 is a cross-sectional view taken along line D-D' in FIG. DESCRIPTION OF SYMBOLS 10...Cover, 13...Protrusion, 31...Boss stopper, 50...Measure zero position adjustment device, 51...
...Zero adjuster, 52...Zero arm, 59...
…groove.

Claims (1)

[Claims for Utility Model Registration] A zero adjustment element provided with an engaging portion that engages with a boss stopper of an internal instrument is rotatably attached to a cover of an instrument, and the zero adjustment element is rotated. In the zero position adjustment device for a meter, which rotates the boss stopper to adjust the zero position of the pointer of the meter, a projection is provided on one side of the zero adjustment element and the cover of the meter, and this projection is inserted into the other. 1. A zero adjustment device for a meter, characterized in that a groove is provided, and a rotation range of a zero adjustment element is restricted by abutment of a protrusion on both ends of the groove.