JP2512317B2 - Electromagnetic actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an electromagnetic actuator provided with two attraction pieces for use in precision small equipment such as a camera.

[Conventional technology]

Since the conventional electromagnetic actuator is equipped with one adsorption piece for one coil core, of course,
The number of operating members of the equipment operated by the suction piece is also one. Therefore, when attempting to operate a plurality of operating members using the electromagnetic actuator, the electromagnetic actuators are required in the number corresponding to the number of operating members.

[Problems to be solved by the invention]

When operating a large number of operating members with electromagnetic actuators, such as small precision machines such as cameras, equipping the electromagnetic actuators with the same number as the operating members is one of the causes that hinders downsizing of the device. Will also be. In order to solve this, by arranging two adsorption pieces for one coil core, it is possible to operate two operation members with one electromagnetic magnet, and the number of actuators is halved. You can also do it.

However, arranging two attraction pieces on one coil core means that there are also two gaps between the attraction piece and the coil core, which increases the magnetic resistance of the magnetic path formed. As a result, the operating member cannot be operated unless a larger amount of electric power is supplied than that of the conventional electromagnetic magnet having one attracting piece for one coil core.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention allows one of the two adsorption pieces to be in contact with the coil core when the coil is in the non-excited state so that the air gap formed on the magnetic path can be operated as one. A coil core made of a magnetic material, a coil wound around the coil core, a yoke made of a magnetic material arranged in parallel to the coil core, and both ends of the yoke. One end of the magnetic material, which is supported at one end thereof and is disposed at a position facing both ends of the coil core, and which moves between an adsorption position attracted to the coil core and a separation position separated from the position. Two suction pieces, a first operation member driven by the movement of the first suction piece, a second operation member driven by the movement of the second suction piece, and one of the coil cores. Adsorption of the other piece prior to the suction operation of the adsorption piece Is positioned in the suction position of, it is characterized in that a contact mechanism for holding.

[Action]

When the coil is in the initial state where it is not excited, the second
The suction piece is held at the suction position by the contact mechanism.
When the coil is excited, the first attraction piece is attracted to the coil core, and the first operating member is rotated to the second position. At this time, since the second attracting piece is in contact with the coil core and there is only one air gap in the magnetic path, when attracting the first attracting piece, the same attraction as that of the conventional electromagnetic magnet having one attracting piece. The first operation member is rotated by force. Further, at this time, since the second suction piece is also in the suction state, the second operation member is prevented from rotating and remains at the first position.

When the excitation of the coil is released, the first operating member returns to the first position and the second operating member rotates to the second position.

〔Example〕

 Examples of the present invention will be described below.

FIG. 1 is an exploded view of an electromagnetic actuator embodying the present invention. In the figure, 1 is a coil core made of a magnetic material, 2 is a coil, and a large-diameter suction portion 1a is formed at one end of the coil core 1 and a small diameter protrusion 1b 'is formed at the other end.
After inserting the coil 2 into the coil core 1, the suction portion 1b is inserted into the small diameter protrusion 1b 'and fixed by welding or the like. Reference numeral 3 is a yoke forming a part of the magnetic path of the electromagnet, and reference numerals 4 and 5 are adsorption pieces, each of which is narrowed down downward to form tips 4a and 5a. Further, two notches 4b are formed in the upper part of the adsorption solid 4, two notches 5b are formed in the upper part of the adsorption piece 5, and the adsorption pieces 4 and 5 are connected to the ends 3c and 3d of the yoke 3. Lock movably.

Reference numeral 6 denotes a leaf spring, which is located on the yoke 3 and has locking portions 6e for preventing the suction piece 4 from slipping out at the left and right ends and a suction piece 5
When the attraction pieces 4 and 5 are in a state of being locked to the yoke 3, a locking portion 6f is provided to prevent the leaf spring from coming off, and the locking portions 6e and 6e of the leaf spring are
The f is engaged with the notches 4d and 5d provided on the upper portions of the suction pieces 4 and 5, respectively. Further, spring pieces 6c, 6d are provided on the left and right of the engaging portions 6e, 6f of the leaf spring 6, and as shown in an enlarged view in FIG. 2, less than half of the upper surfaces of the cutouts 4b, 5b of the attraction pieces 4, 5. And the suction pieces 4 and 5 are urged upward by force F. As a result, the suction pieces 4, 5 receive the rotation moment M toward the inside, that is, the suction portions 1a, 1b of the coil core 1, and contact the suction portions 1a, 1b.

A magnet holder 7 has a screw hole 7b and a boss hole 7c in the yoke connecting portion 7a, and the yoke 3 and the leaf spring 6 located thereon are screwed to the boss 3e and the screw hole 3f provided in the yoke 3. It is fixed by screws 8. At the rear of the magnet holder 7, there is an extending portion 7d directed downward, from which the coil core holding portions 7e, 7f extend forward and to the left, and two fingers 7g and 7h for holding the coil core are respectively provided at the tips thereof. There are openings 7l and 7m each having a space for holding the inside of the left and right suction plates 1a and 1b of the coil core 1. The extension 7d of the magnet holder 7 has a screw hole 7p and a boss hole 7q for fixing to the mounting plate 9,
The boss 9c and the screw 10 screwed into the screw hole 7p can fix the boss 9c.

11 is a first operating lever operated by the suction piece 4, 12
Is a second operation lever operated by the adsorption piece 5,
They are arranged inside the adsorption pieces 4 and 5, respectively.

Next, the shapes of the suction plates 1a and 1b at the tip of the coil core will be described.

As shown in FIG. 3 (b), the surfaces 1a and 1b of the suction part are raised surfaces composed of a gentle spherical surface having a small curvature or a conical surface having an extremely large apex angle, and the apex Q thereof is a suction piece.
Seen from the fulcrum S of the yokes 4 and 5 with respect to the yoke 3, the positions are outside the center of the coil core.

As a result, when the suction pieces 4 and 5 are sucked by the suction portions 1a and 1b, the contact point is the apex Q of the raised surface, so that the distance from the fulcrum S of the suction pieces is constant. Further, since the surface is a gentle spherical surface or a conical surface with an extremely large apex angle, the gap between the adsorption pieces 4, 5 and the adsorption portions 1a, 1b is small, and the magnetic resistance is small.

In FIG. 3 (a), the suction portion 1b and the suction piece 5 are in a one-sided contact with each other.
FIG. 3 (c) shows a state in which they are in contact with each other at a point P.
It shows the case where the curvature of 1b is large, and in each case the void is large,
This is an example in which the suction force becomes small.

Next, the operation of the electromagnetic actuator of the present invention will be described.

FIG. 4 shows the initial state, and the coil 2 is not energized. Further, the second actuating lever 12 on the left side of the drawing is locked at the position shown in the drawing by the locking mechanism of the device to which the present electromagnetic actuator is applied (not shown), and is not in contact with the suction piece 5, so the suction piece 5 Reference numeral 5 is in contact with the suction portion 1b. On the other hand, the first actuating lever 11 on the right side in the drawing is biased in the clockwise direction by a device to which the electromagnetic actuator (not shown) is applied, and is stopped at the position shown in the drawing. Since this urging force is larger than the counterclockwise urging force urged by the spring piece 6c of the leaf spring 6 to the suction piece 4, the suction piece 4 is separated from the suction portion 1a.

When a current is applied to the coil 2 in this state, a magnetic path is formed by the coil core, the adsorption portion, the adsorption piece, and the yoke, and the adsorption piece 4 is adsorbed by the adsorption portion 1a as shown in FIG. lever
Turn 11 counterclockwise. On the other hand, the suction piece 5 is the suction portion 1b.
There is no change because it is in contact with.

When the first actuating lever 11 rotates counterclockwise, the locking mechanism of the device to which the electromagnetic actuator (not shown) is applied is released, and as shown in FIG. It is biased to rotate counterclockwise. But,
Since the coil is energized at this point, the adsorption piece 5
Is attracted to the attraction portion 1b, the second actuating lever 12 contacts the attraction piece 5 and is prevented from further rotation.

Further, when the coil 2 is de-energized, the suction piece 5 is opened as shown in FIG. 7, the second actuating lever 12 is rotated counterclockwise by the urging force of a device (not shown), and The operating lever 11 is rotated by the urging force in the clockwise direction.

By operating the locking mechanism of the device (not shown), the second actuating lever 12 is locked at a position where it does not contact the suction piece 5, and the initial state shown in FIG. 4 is restored.

As shown in FIG. 5, the left and right suction pieces 4 and 5 are attached to the suction portions 1a and 1b.
When it is adsorbed on, the magnetic path is closed, the magnetic resistance is reduced, the magnetic flux density is increased, and saturation is reached. Since this consumes useless power, it is necessary to confirm that the adsorption piece is adsorbed.
A switch (not shown) interlocking with 11 or a counter electromotive current generated in the coil is detected to reduce the current flowing in the coil. FIG. 8 shows an example of the control circuit. When the detection signal is input to the microcomputer and the detection signal indicates that the adsorption piece has been adsorbed, one of the transistors Q ₁ and Q ₂ connected to the output port of the microcomputer. Is turned off to reduce the current flowing through the coil 2.

〔The invention's effect〕

As described above, according to the present invention, two attraction pieces are provided for one coil, and the coil is excited with the second attraction piece being in contact with the coil core. The first operation member is operated by the suction operation of the suction piece, and the second operation member is operated by opening the second suction piece when the excitation of the coil is released. Therefore, one coil can operate two operation members. It can be operated. And since there is only one air gap on the magnetic path of the electromagnetic magnet, the magnetic resistance is the same as the conventional electromagnetic actuator equipped with one adsorption piece, and two magnetic actuators with the same electric power as the conventional electromagnetic actuator. The operation member can be operated.

[Brief description of drawings]

FIG. 1 is an exploded view of an electromagnetic actuator according to the present invention, FIG. 2 is an enlarged cross-sectional view illustrating an engagement state of a yoke and an attraction piece, and FIG. 3 is a shape explanatory view of a tip attraction portion of a coil core. Four
Figures 7 to 7 are explanatory views of the operation of the electromagnetic actuator,
The figure is a coil energization control circuit diagram. 1: Coil core, 1a, 1b: Adsorption part, 2: Coil, 3: Yoke, 4,5:
Adsorption piece, 6: leaf spring, 7: magnet holder.

Claims (1)

(57) [Claims] 1. A coil core made of a magnetic material, a coil wound around the coil core, a yoke made of a magnetic material arranged in parallel with the coil core, and one end at each end of the yoke. Are disposed at positions facing both ends of the coil core, and are made of a magnetic material that moves between an attracting position to be attracted to the coil core and a separating position away from that position. Adsorption piece, first operation member driven by movement of the first adsorption piece, second operation member driven by movement of the second adsorption piece, and one adsorption piece by the coil core Prior to the above suction operation, the electromagnetic actuator is provided with an abutting mechanism that positions and holds the other suction piece.