JPS6120122B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for assembling a yoke for a demagnetizing release device.

A degaussing release device is generally constructed as shown in FIG. That is, a pair of yokes 1a, 1
b are arranged almost parallel to each other, a permanent magnet 2 is interposed between the yokes 1a and 1b on one end side and the side surface, and a coil 3 is attached to the outer periphery of the yoke 1a. A movable member 4 is arranged near the end face so as to be selectively magnetically attracted to the end face. The movable member 4 has one end, for example, a shaft 5.
It is rotatably supported by the spring 6, and the restoring force of the spring 6 always applies a biasing force in the direction indicated by the arrow 7 in the figure.

When actually using the device configured as described above, proceed as follows. That is, the movable member 4
When the movable member 4 is rotated by some means to the position shown in FIG. 1, the movable member 4 receives the magnetic force of the permanent magnet 2 and is magnetically attracted to the end faces P ₁ and P ₂ of the yokes 1a and 1b.
Maintain this state. In this state, if a magnetomotive force is generated in the coil 3 in a direction that cancels the magnetic force of the permanent magnet 2, the magnetic attraction force becomes extremely small, and as a result, the movable member 4 is moved by the restoring force of the spring 6 at the arrow 7 in the figure. It rotates in the direction shown by and performs a so-called release operation. Therefore, various devices can be driven using the above release operation. Such a degaussing type release device uses the permanent magnet 2 to hold the energy for causing the movable member 4 to move, so there is no need to consume power for holding it, and therefore the range of use is limited. There are wide advantages.

However, in the case of the release device shown in Fig. 1, the permanent magnet 2 is interposed in the magnetic path through which lines of magnetic force are passed to cancel the magnetic attraction force, so the magnetic resistance of the permanent magnet 2 is not affected. However, there was a problem in that the canceling magnetic flux was not small, and in order to increase the canceling magnetic flux, a large current had to be passed through the coil 3.

Recently, in order to eliminate the above-mentioned drawbacks, shunt protrusions 11a and 11b have been installed on the opposing surfaces of the yokes 1a and 1b so as to face each other via a magnetic gap Q, as shown in FIG. What has been set up is being considered. This new device still obtains energy from the permanent magnet 2 to magnetically attract the movable member 4 to the end faces P ₁ and P ₂ of the yokes 1a and 1b, but when performing the release operation, the coil 3 By supplying the generated magnetic flux to the end faces P 1 and P ₂ through _the path from the projection 11a to the magnetic gap Q to the projection 11b, the coil current required for release is reduced. Note that since the protrusions 11a and 11b face each other through a small magnetic gap Q,
A part of the magnetic flux generated by the permanent magnet 2 passes through the gap Q, increasing the so-called loss, but the above-mentioned loss is prevented by improving the adhesion of the attracting surface.

By the way, when assembling a degaussing type release device that employs the above-mentioned magnetic shunt method, normally the protrusion 1
After preparing a pair of yokes 1a and 1b having the yokes 1a and 11b and polishing the end faces P ₁ and P ₂ of these yokes 1a and 1b, which can become the magnetic pole faces, the yokes 1a and 1b are shown in Fig. 2. As shown, they are positioned in parallel and fixed in this state, with a permanent magnet 2 interposed between the successor irons 1a and 1b. Note that an adhesive or the like is placed in advance between the magnetic pole surface of the permanent magnet 2 and the yoke 1a, 1b to bond and fix the joint surfaces. Then, the coil 3 and movable member 4 are finally attached.

However, when the above-described assembly means is employed, the following problems occur. That is, as described above, the end surfaces P ₁ and P ₂ that can become the magnetic pole surfaces of the yokes 1a and 1b are sufficiently flat and both surfaces are located on the same plane in order to effectively utilize the magnetic flux generated by the permanent magnet 2. There must be. However, in the conventional assembly method, each end face of the independent yokes 1a and 1b is polished, so it is not possible to polish each end face P ₁ and P ₂ under the same conditions, and as a result, There is a drawback that the adhesion between the end faces P ₁ and P ₂ cannot be made equal. In addition, since independent yokes 1a and 1b are used, it is difficult to position these yokes 1a and 1b accurately, resulting in problems such as variations in characteristics after assembly. .

The present invention was made in view of the above circumstances, and its purpose is to provide a demagnetized release that enables accurate positioning of yokes and polishes the end faces that can become the magnetic pole faces of each yoke under the same conditions. An object of the present invention is to provide a method for assembling a yoke for a device.

Hereinafter, the details of the present invention will be explained with reference to one embodiment shown in the drawings.

First, as shown in FIG. 3a, a magnetic member 21 that can serve as a yoke and a non-magnetic member 22 for fixing this magnetic member 21 are prepared.

The magnetic member 21 is the yoke 1 shown in FIG.
Mutually parallel parts 23a, which can be a, 1b,
23b, and a connecting portion 24 that integrally connects these portions 23a and 23b, and the H
formed into a shape. Note that bolt insertion holes 2 are provided at both ends of the portion 23a and at one end of the portion 23b.
5, 26, and 27 are provided. On the other hand, the non-magnetic member 22 is formed in a shape corresponding to the portion of the magnetic member 21 in which the insertion hole 27 is provided in the portion 23a, the connecting portion 24, and the portion 23b. Note that female holes 28 and 29 are provided in portions corresponding to the insertion holes 25 and 27, and a notch 30 is provided in a portion corresponding to the insertion hole 26.

After preparing the magnetic member 21 and the non-magnetic member 22 in this way, the end faces P ₁ and P ₂ of the magnetic member 21 that can become the magnetic pole faces are polished. This work is performed simultaneously with the magnetic member 21 fixed to a suitable jig. After the polishing work is completed, bolts 31, 32, 3 are inserted into the insertion holes 25, 26, 27 of the magnetic member 21 .
3, and using these bolts 31, 32, 33, the magnetic member 21 is tightened and fixed to the non-magnetic member 22 as shown in FIG. 3b.

Next, as shown in FIG. 3b, the connecting portion 24 of the magnetic member 21 is cut with a cutter or the like, and the separated yoke 1
a and 1b, and by selecting the thickness of the cutter, a magnetic gap Q having a desired gap length is formed in the connecting portion 24. Subsequently, a permanent magnet 2 is interposed between the yokes 1a and 1b, and a coil 3 is attached to the yoke 1b, thereby forming a device similar to that shown in FIG. 2.

Adopting such an assembly means has the following advantages. In other words, the end faces of the yokes 1a and 1b, which can become the magnetic pole faces, can be polished at the same time.
The end faces P ₁ and P ₂ can be polished under the same conditions, eliminating uneven adhesion. Portion 23a that can become yoke 1a
First, a magnetic member 21 consisting of a portion 23b that can become the yoke 1b and a connecting portion 24 connecting these portions 23a and 23b is fixed to a non-magnetic member 22 , and in this state, the connecting portion 24 is cut. protruded yokes 1a and 1b separated by;
Since a magnetic gap Q is formed between the protrusions, the positional relationship between the yokes 1a and 1b is constant for each device, and therefore a large number of devices with the same characteristics can be manufactured. be able to.

In the above-described embodiment, an H-shaped magnetic member is used, but a U-shaped magnetic member may also be used. Further, the shape of the non-magnetic member is not limited to that shown in the examples.

As detailed above, according to the present invention, since the above-mentioned assembly means is adopted, the characteristics can be made uniform,
It is possible to provide a yoke assembly method for a degaussing release device that can contribute to loss reduction and is especially effective when applied to small devices.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional device of this type, FIG. 2 is a block diagram of a recently proposed device of this type, and FIGS. 3a and 3b are diagrams for explaining one embodiment of the present invention. 1a, 1b...Yoke, 2...Permanent magnet, 3...
Coil, 4...Movable member, 6...Spring, 1
1a, 11b...Protrusion, 21 ...Magnetic member, 22
...Nonmagnetic member, 24...Connection part, P ₁ , P ₂ ...
End face, Q...magnetic cap.

Claims (1)

[Claims] 1. A permanent magnet is interposed between the first and second yokes that are arranged approximately parallel to each other, and the movable member is magnetically attracted between the end faces of the yoke by the magnetic force of the permanent magnet, and the movable member is magnetically attracted to at least one of the yokes. In the method for assembling a yoke of a degaussing type release device, the movable member is released by generating a magnetomotive force in a direction that cancels the magnetic attraction force in the attached coil. A first yoke-equivalent part that can be iron;
A magnetic member consisting of a second yoke-equivalent portion and a connecting portion that integrally connects the first and second yoke-equivalent portions at a portion different from the end face serving as the magnetic pole face is prepared, and the magnetic member is After polishing the end surfaces of the first and second yoke-equivalent parts that can become magnetic pole surfaces, the magnetic member is fixed to a non-magnetic material, and then the connected portion of the magnetic member is separated by cutting. 1st, 2nd
1. A method for assembling a yoke for a demagnetizing release device, characterized in that a yoke is formed, and a gap for magnetic bypass is formed at the cut portion.