JPS6018805Y2 - Release type electromagnet actuator - Google Patents

Description

[Detailed description of the invention] The invention consists of an iron core, a coil wound around the iron core, a movable iron piece that is placed opposite to the iron core and has a tendency to separate from the iron core by a spring, and an iron core. Or, it consists of a permanent magnet combined with a movable iron piece, and the set state where the movable iron piece is brought into contact with the iron core against the spring behavior is held by the attractive force of the permanent magnet, and held by the permanent magnet by energizing the coil. This invention relates to an operating device for a release type electromagnet in which a movable iron piece moves away from an iron core when the force is weakened.

The movable iron piece mentioned above performs the work required by the device in which the electromagnet is used in the final stage of its separation movement from the iron core, but the strength of the spring that is the source of force for this separation movement is The strength is strongest in the set state where the movable iron piece is in contact with the iron core, and the weakest in the final region of the separation movement where the movable iron piece actually does work.

Therefore, the strength of the spring is designed to provide the necessary force when doing the job, but when it is set, it becomes stronger than necessary, and a permanent magnet is needed to hold it. Furthermore, the coil that cancels out the magnetic force also needs to have a large number of turns, which has the disadvantage that the electromagnet becomes larger compared to the required spring force.

In view of the above-mentioned drawbacks, the present invention forms an auxiliary part on the movable iron piece that approaches the iron core when the movable iron piece separates from the iron core. To provide an actuating device for a release type electromagnet which can be miniaturized and can obtain the necessary operating force for a movable iron piece without increasing the spring force by assisting the separation movement of the movable iron piece.

Embodiments of the present invention will be described in detail below based on the drawings.

First, FIG. 1 shows a type in which a permanent magnet is combined with an iron core, where 1 is the iron core, 2 is a coil, and 3 is a permanent magnet.

Reference numeral 4 designates an iron piece lever which is pivotally mounted on a shaft 5 and given dextrorotation by a spring 6, which forms an actuating arm 4a and a bending arm 4b, and further has an auxiliary bending arm facing one end face of the iron core 1. 4c is formed.

Reference numeral 7 denotes an iron piece which is pivotally attached to the support shaft 4d of the iron piece lever 4 and arranged so as to be swingable within the bending range 4b, and is disposed opposite to the other end surface of the iron core 1.

Reference numerals 11 and 13 are a closing drive member and a locking lever in, for example, an electric shirt shirt for a camera, and the drive member 11 is connected to the shaft 1.
The lever 13 is pivotally connected to a shaft 14 and provided with right rotation by a spring 15, and forms a stepped portion 11a, and is provided with a driving source in the direction of the arrow. An arm 13a that is pushed by the operating arm 4a of the lever 4 and a protrusion 13b that engages with the stepped portion 11a of the drive member 11 are formed.

In the illustrated state, the iron piece lever 4 is rotated to the left against the tension of the spring 6 by a set member (not shown), and the iron piece 7 is brought into contact with the iron core 1 and is attracted and held by the magnetic force of the permanent magnet 3. This is where I am.

To explain its operation in relation to the closure system for electric camera shutters, when the shutter blade opens due to the release operation, the delay circuit that controls the exposure time starts operating, and after a predetermined time, the coil 2 starts operating. Pulsed.

Since the magnetic force of the permanent magnet 3 is canceled by the excitation of the coil 2, the iron piece lever 4 is rotated to the right by the tension of the spring 6.

With this right rotation, the bend 4c approaches the iron core 1, so the bend 4c approaches the iron core 1.
C is attracted to the iron core 1 by the magnetic force of the permanent magnet 3.

Therefore, the iron piece lever 4 is rotated to the right by the combined force of the spring action and the magnetic action, and the arm 13a is pushed by the operating arm 4a, and the locking lever 13 is rotated to the left against the tension of the spring 15.

As a result, the protrusion 13b comes off the step 11a, and the closing drive lever 11 rotates in the direction of the arrow to close the shutter blade.

Fig. 2 shows a combination of a permanent magnet on one side of a movable iron, and a permanent magnet 3' on an operating lever 4', which corresponds to the iron piece lever 4 in Fig. Two C-shaped magnetic members 8 and 9 are attached.

Figure 3 also shows a combination of permanent magnets on one side of the movable iron, but in this case two permanent magnets 3a and 3b are used, one is attached to the surface of the iron piece 7' facing the iron core 1', and the other The first
It is attached to the bent portion 4c of the iron piece lever 4 shown in the figure.

In the case of FIG. 3, it is preferable that the iron piece lever 4 and the iron piece 7 be made of a non-magnetic material, such as aluminum, which has a low specific gravity.

In addition, when a permanent magnet is attached to one side of the movable iron, the partner that causes magnetic action with the auxiliary part does not have to be the iron core 1 around which the coil 2 is wound, but a separate iron core that has the same effect. May be placed.

As described above, in the release type electromagnet of the present invention, when the movable iron piece separates from the iron core due to its spring behavior, an auxiliary part that approaches the iron core is formed on the movable iron piece, and the permanent magnet moves the iron core and the auxiliary part. Since the separation movement of the movable iron piece is assisted by the suction action, a predetermined force can be obtained for the separation movement of the movable iron piece without increasing the spring force, and the electromagnet as a whole can therefore be made smaller. .

[Brief explanation of the drawing]

FIG. 1, FIG. 2, and FIG. 3 are explanatory diagrams showing different embodiments of the present invention, respectively. 1, 1'... Iron core, 2... Coil,
3. 3', 3at3b...Permanent magnet, 4
..... Iron piece lever 4' ..... Operating lever, 6 ..... Spring, 7, 7' ..... Iron piece, 8
, 9...Magnetic member.

Claims (1)

[Scope of claim for utility model registration] An iron core, a coil wound around the iron core, a movable iron piece that is placed opposite to the iron core and has a tendency to separate from the iron core by a spring, and the iron core or the movable iron piece. The set state in which the movable iron piece is brought into contact with the iron core against the spring behavior is held by the attractive force of the permanent magnet, and the holding force by the permanent magnet is weakened by energizing the coil. In a release type electromagnet, the movable iron piece moves away from the iron core when the movable iron piece moves away from the iron core, the movable iron piece is formed with an auxiliary part, and the auxiliary part moves the iron core or the other when the movable iron piece moves away from the iron core. An actuating device for a release-type electromagnet, characterized in that the movable iron piece moves close to the iron core and assists the movement of the movable iron piece away from the iron core by the attraction action of the permanent magnet to the iron core.