JPH0626898Y2 - Electromagnetic device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Use of the Invention] The present invention relates to an electromagnet device for stabilizing operation.

[Background of the Invention] Conventionally, particularly at the time of setting, the iron piece lever is pushed and the iron piece arranged on the lever is crimped to the iron core around which the winding is wound.
In the release operation, first, the winding is energized to excite the iron core to adsorb the iron piece, and subsequently, the pushing force for the iron piece lever is removed, and then, at a predetermined timing, to the winding. In an electromagnet device for a camera in which the power supply is cut off to demagnetize the iron core so that the iron piece lever and the iron piece lever are separated from the iron core, as shown in FIGS. 4 to 7, the iron piece is attracted to the iron core 1 of the electromagnet apparatus. Iron piece 2
The outer diameter of the iron piece shaft 3 is between the iron piece shaft 3 provided with a brim 3a for supporting the iron piece shaft 3 and the guide hole 6 provided in the iron piece lever 5 which is swingable around the shaft 4 as a fulcrum on a substrate not shown. And the guide hole 6 is set to have a different inner diameter, and a coil spring 7 is wound around the iron piece shaft 3 between the iron piece 2 and the iron piece lever 5 for tensioning.

Further, the concave portion 5a provided at the end of the iron piece lever 5 and the outer periphery of the coil spring 7 are compressed while being rotated by the shaft 4, which causes a shift, so that a gap corresponding to this is prepared in advance.

By using the electromagnet device of the type having such a coil spring, when charging the shutter, the set pin 8 pushes the edge of the iron piece lever 5 to press the iron piece 2 onto the iron core 1 as shown in FIG. After that, the iron pieces 2 are prevented from being worn away from each other by sliding on the attraction surface of the iron core 1 when the set pin 8 is further overcharged.

However, as a result, as shown in FIGS.
When the iron pieces 2 are set while being displaced from the normal suction (compression) position due to the overlapping of their circumferences when compressed, and the deviation between the guide hole 6 and the iron piece shaft 3, The adsorption state becomes unstable.

This is because the outer dimension of the iron piece 2 is made as small as possible in order to reduce the moment of inertia.

Alternatively, a variation occurs in the adsorption area, which causes irregularity in the separation time of the iron piece 2 when demagnetizing the electromagnet,
In particular, when the shutter for a camera is used for unlocking the opening of the shutter blade, there is an inconvenience such as irregular exposure time.

Of course, the same applies when used to unlock the closure.

[Object of the Invention] An object of the present invention is to provide an electromagnet device which solves the above-mentioned inconveniences, prevents the displacement of the attraction position when the iron piece is set, and prevents irregularities in the separation time of the iron piece. Especially.

[Configuration of the Invention] The above-described object of the present invention is to make the winding diameter of the coil spring substantially equal to the outer diameter of the iron piece shaft on the iron piece side, and gradually increase from the iron piece toward the iron piece lever member side so that the coil spring is substantially The iron piece lever member has a conical shape with a uniform interval, and the iron piece lever member has a concave spring receiving portion having an inner diameter substantially equal to the diameter of the coil spring around the loose fitting hole with respect to the iron piece shaft.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention in a normal set position, and FIG. 2 also shows an overcharge state.
FIG. 3 also shows the operation completed state.

In order to avoid complication in the description of the embodiment,
The numbers given to the respective parts are the same as in the conventional example.

The outer diameter of the coil spring 7 on the iron piece 2 side is substantially equal to the outer diameter of the iron piece shaft 3, and the outer diameter of the iron piece lever 5 side is formed to prevent inadvertent movement in the direction intersecting with the iron piece shaft 3. The outer peripheral diameter is substantially equal to the inner diameter of the recess 5a at the end of the iron piece lever.

Therefore, as a whole, it is formed in a tapered shape so that the circumferential diameter of the coil spring 7 is gradually reduced from the widest iron piece lever 5 side to the iron piece 3 side (the iron piece 3 side is gradually increased to the iron piece lever 5 side). ing.

Since the outer diameter of the coil spring 7 gradually decreases toward the iron piece 3 side, as shown in FIG. 2, an overcharged state occurs, and even if the coil springs overlap each other, the coil spring 7 is not displaced, Therefore, there is no contact with the lever end surface.

By setting the outer diameter on the one end side of the coil spring to be substantially equal to the inner diameter of the recess of the lever, it is difficult to cause a positional deviation between the support shaft and the guide hole.

[Advantages of the Invention] By implementing the present invention as described above, it is possible to prevent the displacement of the attraction position when setting the iron piece, which is included in the conventional electromagnet device, and to prevent the irregularity of the separation time of the iron piece. It is possible to obtain a possible electromagnet device.

[Brief description of drawings]

FIG. 1 is a plan view showing a normal adsorption operation according to an embodiment of the present invention, FIG. 2 is an explanatory view showing the same when overcharged, and FIG. 3 is an explanatory view showing the same when separated. FIG. 4 is a plan view showing a conventional example at the time of normal adsorption, FIG. 5 is an explanatory view showing the same when overcharged, FIG. 6 is an explanatory view showing the same when separated, and FIG. 7 is the same iron piece. FIG. 6 is an explanatory view showing a suction state in which a position shift occurs. 1 ... Iron core, 2 ... Iron piece 3 ... Iron piece shaft, 4 ... Axis 5 ... Iron piece lever, 5a ... Concave section 6 ... Guide hole, 7 ... Coil spring 8 ... Set axis

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliographic references Sho 54-86425 (JP, U) "Handbook of mechanical elements from the viewpoint of patents {shafts, bearings, springs, shock absorbers}" First edition Japan Institute of Invention and Innovation (1982) February 1st) P. 871 (fig. 3871), Noboru Koma, "Handbook for Machinery and Equipment Design," 4th edition, Taikaku (March 20, 1960) P. 215 (Fig. 601), Bettei Ban Manai, "Mechanism," 13th edition, Gihodo (March 15, 1975) P. 314-315 (Fig. 17)

Claims (1)

[Scope of utility model registration request] 1. An iron core around which a winding is wound, an iron piece lever member rotatably supported, an iron piece shaft having a brim at one end loosely fitted and supported on the iron piece lever member, and the brim. Seen from above, the iron piece supported by the other end of the iron piece shaft passing through the iron piece lever member, and the iron piece arranged to face the iron core, and surrounding the iron piece shaft, and between the iron piece lever member and the iron piece. And a coil spring that acts so as to bring the brim into contact with the iron piece lever member and to move the iron piece away from the iron piece lever member. The winding diameter is a diameter substantially equal to the outer diameter of the iron piece shaft, and the diameter is gradually increased from the iron piece toward the iron piece lever member side, and has a conical shape with a substantially uniform interval with respect to the shaft. The lever member is An electromagnet device, comprising a recessed spring receiving portion having an inner diameter substantially equal to the diameter of the coil spring, around the loose fitting hole for the iron piece shaft.