JPH0322890Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to improvements in electromagnetic devices.

(b) Prior Art In recent years, electromagnetic devices that electromagnetically attract mechanism levers have been used to maintain various modes of tape recorders and the like.

This electromagnet device is compactly formed by a U-shaped iron core and a suction piece, as described in, for example, Japanese Utility Model Application Publication No. 58-164208.

Regarding such conventional electromagnet devices, Figures 2 to 5
This will be explained with figures.

In the figure, 1 indicates a first yoke 1a and a second yoke facing each other.
A U-shaped iron core having a yoke 1b, 2 an excitation coil provided on one yoke, for example, the first yoke 1a, 3 a movable lever that is part of the mechanism, 4
is an adsorption piece in which a mounting hole 6 is loosely fitted to a support shaft 5 set up on the movable lever 3 with a clearance.

As can be seen from the figure, and as described in Japanese Utility Model Publication No. 58-164208, the first yoke 1a and the second yoke
The suction piece 4 that is suctioned to the yoke 1b is attached to each yoke 1.
A mounting hole 6 approximately in the center of the support shaft 5 was loosely fitted into the support shaft 5 located between a and 1b.

(c) Problems to be solved by the invention According to the above-mentioned conventional electromagnet device, as shown in FIG.
If it is attracted from side a, the other second yoke 1b
Since the suction force on the side is weak, even if there is a clearance between the mounting hole 6 and the support shaft 5, the suction piece 4 cannot be brought into complete contact with the suction piece 4, and the suction piece 4 is held in the state shown in Fig. 2. As a result, there was concern that the slightest shock could cause them to separate.

That is, in FIG. 3, since the pivot shaft 5 of the suction piece 4 is located on the midline between the lines of action of the suction force Fa generated from the first yoke 1a and the suction force Fb generated from the second yoke 1b, The rotational moment around the support shaft 5 due to the attraction forces Fa and Fb is determined by the arm length a on which the attraction force Fa acts on the first yoke 1a,
Since the arm length b on which the adsorption force Fb on the second yoke 1b side is equal, the adsorption force on the first yoke side is strong.
Based on Fa, its rotational moment becomes large and it is attracted as shown in Fig. 2.

Therefore, the suction piece 4 is attached to each yoke 1 of the U-shaped core 1.
a, 1b, the suction piece 4 is attached clockwise with a spring wire 7 so that the suction piece 4 attracts from the side of the second yoke 1b where the excitation coil 2 is not wound, as shown in FIG. As a result, as shown in FIG. 5, the clearance between the mounting hole 6 and the support shaft 5 is reduced due to the strong attraction force on the side of the first yoke 1a around which the excitation coil 2 is wound. The suction pieces 4 were made to completely adhere to each of the yokes 1a and 1b.

For this reason, there was a problem in that the spring wire 7 was specially required and at the same time the assembly work was time-consuming.

(d) Means for solving the problems In view of the above-mentioned problems, the present invention is based on the first method to solve the problems.
An electromagnetic device comprising an excitation coil provided on a first yoke of a U-shaped iron core having a yoke and a second yoke, and an adsorption piece attached to each of the yokes rotatably provided on a support shaft on a movable lever. The rotating support shaft of the attraction piece is provided on the line of action of the attraction force generated from the first yoke on which the excitation coil is provided, so that the attraction piece is attracted from the second yoke side. The present invention provides an electromagnet device that

(E) Effect According to the electromagnet device of the present invention, since the pivot axis of the attraction piece is provided on the line of action of the attraction force generated from the first yoke provided with the excitation coil, the attraction force generated from the first yoke is The arm length of the rotational moment generated around the support shaft by force is reduced to zero, and the second
Due to the suction force generated by the yoke, the length of the arm of the rotational moment generated around the support shaft can be increased, and as a result, even though the suction force on the first yoke side is strong, the suction piece cannot be moved away from the second yoke side. Acts as an adsorbent.

(F) Embodiment An embodiment of the present invention shown in FIG. 1 will be described. In the figure, each component is the same as the conventional device, so the same figure number is given.

The feature of the present invention is that the first yoke 1a
This is because the pivot shaft 5 of the suction piece 4 is provided on the line of action of the suction force Fa generated by the suction force Fa.

Therefore, the arm length of the rotational moment generated around the support shaft 5 due to the adsorption force Fa generated by the first yoke 1a can be reduced to zero, and the length of the arm of the rotational moment generated around the support shaft 5 can be reduced to zero.
The length of the arm of the rotational moment generated around the support shaft 5 due to the adsorption force Fb generated by this can be set to .

This length is the length a explained in the conventional device above.
and the length b, and as a result, the rotational moment due to the attraction force Fa becomes zero, and the rotational moment due to the attraction force Fb doubles, which is the same effect as that of the spring wire shown in Figure 4. It is something that can be done.

Note that 3' in the figure is a bent piece of the movable lever 3, which restricts the rotation range of the suction piece 4.

(g) Effects of the invention Since the present invention is constructed as described above, it is possible to reliably bring the suction pieces into close contact with each yoke of the U-shaped core without the aid of spring wires. It has a simple structure and is easy to assemble, making it useful for practical purposes.

[Brief explanation of drawings]

FIG. 1 is a plan view of the electromagnet device of the present invention, and FIGS. 2 to 5 are plan views illustrating conventional electromagnet devices. 1... U-shaped iron core, 1a... First yoke, 1b
... Second yoke, 2 ... Excitation coil, 3 ... Movable lever, 4 ... Adsorption piece, 5 ... Support shaft, 6 ... Mounting hole.

Claims (1)

[Scope of utility model registration request] An excitation coil is provided on the first yoke of a U-shaped iron core having a first yoke and a second yoke facing each other, and an adsorption piece that is adsorbed to each of the yokes is rotatably provided on a support shaft on a movable lever. An electromagnetic device,
An electromagnet characterized in that a pivot shaft of the attraction piece is provided on the line of action of the attraction force generated from the first yoke on which the excitation coil is provided, so that the attraction piece is attracted from the second yoke side. Device.