JPH0549061B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a movable iron piece type meter used mainly as an indicating meter for alternating current.

[Conventional technology]

Conventionally, movable iron piece-shaped meters have been used as AC indicating meters because of their simple structure and low cost. This has a structure in which a fixed iron piece is attached to the inner wall of a cylinder made of non-magnetic material such as zinc, and a movable iron piece, which exerts a repulsive or attractive force between it and the fixed iron piece, rotates together with the pointer shaft. .

[Problem that the invention seeks to solve]

However, since the structure of such a meter is simple, even if an attempt was made to further reduce the price, there was no room for further improvements.

[Means for Solving the Problems] In order to solve these problems, the present invention consists of forming most of the parts as a frame body, and inserting fixed iron pieces loosely into grooves provided in the frame body. It is something that

[Effect]

Adjustment can be made by rotating the frame.

〔Example〕

Figure 1 shows a coil section 1 of a meter to which this invention is applied.
2 is a perspective view showing a bobbin 2 having a shaft hole 2a in the center and an adjustment plate 2b on the front surface, and a coil 3 is wound around the bobbin 2.
4a and 4b are terminals. FIG. 2 is a perspective view showing the movement 30, where 5 is a frame made of resin, and the outer surfaces of the longitudinal sides 5a and 5b are different in the state of sliding into the shaft hole 2a shown in FIG. Grooves 5c and 5d are provided on the outer surfaces 5a and 5b, respectively, as shown in FIG. 3, and claws 6a of the fixed iron piece 6 shown in FIG. , 6b are fitted. The fixed iron piece 6 is held by the friction between the grooves 5c, 5d and the claws 6a, 6b, and the elastic force of the fixed iron piece 6 is adjusted so that the frictional force does not cause the fixed iron piece 6 to fall under its own weight. Further, when this fixed iron piece 6 is fitted into the grooves 5c and 5d, there is a slight play in the circumferential direction, and when the frame 5 is inserted into the shaft hole 2a, the outer surface of the fixed iron piece 6 is against the inner wall of the shaft hole 2a. It is now being lightly pressed.

A bearing 7 is provided on one short side 5e of the frame 5, and the other short side is formed integrally with an arm 8 for fixing the movement 30 to the bobbin 2. are long holes 8a and 8b for fixing
is provided. A U-shaped frame 9 is integrally formed on one surface of the arm 8, that is, the surface opposite to the frame body 5. This frame 9
is provided with a bearing 10, and the shaft 11 is rotatably supported by this bearing 10 and a bearing 7 on the frame side. 12 rotates integrally with the shaft 11;
It is a movable iron piece attached to the fixed iron piece 6, and is attached at a position where a repulsive force with the fixed iron piece 6 acts. 13 is an angle configured to rotate together with the shaft 11, and 14 is a pointer attached to the angle 13.

FIG. 5 is a front view of the frame 9.
Numerals a and 9b are stoppers formed integrally with the frame 9, and when an excessive repulsive torque is applied to the movable iron piece 12, the pointer mounting portion 13a of the angle 13 comes into contact with the stoppers 9a and 9b. . FIG. 6 is a horizontal cross-sectional view of the bearing 7, in which 15 is a stone screw, 16 is a stone cap, 17 is an oil reservoir, and the oil reservoir 17 is filled with braking oil 18. The inlet 17a of the oil reservoir is tapered to prevent oil 18 from leaking. The oil 18 acts as a brake on the shaft 11, and when the pointer 14 returns to normal position, it is set so that the pointer 14 returns at an appropriate speed, taking into consideration the elastic force of the hair spelling 19 shown in FIG.
One with an appropriate viscosity is selected.

FIG. 7 is an exploded perspective view of the zero point adjustment mechanism constructed in the bearing 10 part of FIG. The adjustment claw 23 is a retaining ring, and the tongue piece 22 provided on the adjustment claw 22
A is soldered near the end of the circumference of the hair spelling 19.

After the instrument configured in this manner is temporarily assembled, the zero point adjustment lever 20 shown in FIG. 7 is adjusted to adjust the zero point. At this time, the claw 22 rotates to perform zero point adjustment, and this claw 22 rotates to adjust the zero point.
It is held in place by a friction of 1. Conventionally, the claw 22 was fixed to the arm 8 with a temporary spring or fixed with a lockite, which made stability, economy, and delicate adjustment difficult, but this device uses rubber, etc. Because it is fixed by the frictional force of the washer 21 made of the material,
Stability and economy have been resolved, and subtle adjustments can now be made. If proper sorting is not possible in the assembled state, the sorting can be easily adjusted by rotating the pawl 22.

After the zero point adjustment is completed, the movement 30 is rotated within the range of the elongated holes 8a and 8b to perform coarse adjustment of accuracy. This is because, as mentioned above, the outer surface of the fixed iron piece 6 contacts the inner surface of the shaft hole 2a and is lightly pressed, and the fixed iron piece 6 is designed to rotate slightly in the circumferential direction. By rotating the movement 30, the fixed iron piece 6 and the movable iron piece 12
The relative position of is changed, and the accuracy is coarsely adjusted. After the coarse adjustment is completed, the movement 30 is fixed to the bobbin 2, and the fixed iron piece 6 is fixed to the inner wall of the shaft hole 2a from behind the movement 30 with adhesive or the like. Thereafter, fine adjustment is performed by rotating the adjustment plate 2b in the circumferential direction. Conventionally, these operations had to be carried out using a special jig and through a narrow slit in a cylinder that housed a piece of fixed iron made of zinc or the like, and the cylinder was not connected to the coil. Because it is housed inside,
Since the structure was such that it was not possible to make adjustments while energizing as in this embodiment, the only way to make adjustments was through trial and error. For this reason, the workability was very poor, but in this embodiment, the adjustment can be made while energizing, and all that is required is to rotate the movement, so the workability is extremely improved.

In addition, the oil reservoir for storing braking oil was conventionally provided in the stone screw, which made the stone screw a special product and was not economical.However, as shown in Figure 6, the frame
By providing an oil sump in an integrated structure, the structure of the stone screw became simpler and more economical. Furthermore, since the fixed portion of the movement 30 is integrally formed and the fixed iron piece is attached to it so as to be able to adjust its position, the inner device can be made smaller, and the entire instrument can be made smaller. Since the zero point adjustment section uses a retaining ring 23 as shown in Fig. 7,
The assembly process can be simplified compared to the conventional one using Rockite.

〔Effect of the invention〕

As explained above, in this invention, the frame body and each part attached to it are integrally constructed, so the number of parts is reduced, and the fixed iron piece is fixed between the frame body and the inner wall of the shaft hole, which simplifies the mounting structure and allows adjustment. It also has the effect of being simpler and more economical.

[Brief explanation of the drawing]

Figure 1 is a perspective view of an instrument to which this invention is applied, showing the movement removed, Figure 2 is a perspective view of the movement, Figure 3 is a perspective view of a part of the frame, and Figure 4 ab is fixed. Perspective and side views of shingles,
FIG. 5 is a front view of the movement, FIG. 6 is a partial sectional view of the frame, and FIG. 7 is an exploded perspective view of the zero point adjustment section. 2...Bobbin, 2a...Shaft hole, 3...Coil,
5... Frame, 5a, 5b, 5c... Side, 5c, 5
d...Groove, 6...Fixed iron piece, 6a, 6b...Claw,
7, 10...Bearing, 8...Arm, 8a, 8b...
...hole, 11...shaft, 12...movable iron piece, 20...
Lever, 21...Watsusha.

Claims (1)

[Claims] 1. A coil wound around a bobbin with a shaft hole in the center, a frame made of resin that is inserted with the outer surface sliding into the shaft hole, and when the frame is fitted into the shaft hole, the outer surface will slide into the shaft hole. At a position where a repulsive force acts between the fixed iron piece that is loosely inserted into the groove of the frame while being pressed into the hole, the rotatably supported shaft, and the fixed iron piece that rotates together with the shaft. A movable iron piece type instrument consisting of a movable iron piece provided.