JPH0410652Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to an electromagnetic adsorption device that is incorporated into, for example, an operation switching mechanism of a cassette tape recorder.

(Prior art and its problems) Conventionally, as an electromagnetic adsorption device as described above, the third
The one shown in the figure is known. In the figure, a denotes an electromagnet attached to a mounting board b, and a U-shaped iron core d is inserted through a coil c. There is only one movable iron piece e that is attracted to the end face _d1 of the iron core d, and its base end
_e1 is rotatably attached to the mounting board b. The tip end e ₂ of the movable iron piece e is engaged with the engagement groove g of the moving member f. Then, when the coil c is energized, the iron core d is magnetized, and the movable iron piece e is attracted to the end face d ₁ of the iron core d by the magnetic force, so that the movable iron piece e uses its base end e ₁ as a fulcrum. It rotates counterclockwise from the position shown by the solid line to the position shown by the two-dot chain line, and as the movable iron piece e rotates, the movable member f moves to the left from the position shown by the solid line in the figure and reaches the position shown by the two-dot chain line. The position is shown in .

In such an electromagnetic adsorption device, the end face of the iron core d
The amount of movement S of the movable member f due to the movable iron piece e being attracted to _d1 is determined by the gap M between the iron core d and the movable iron piece e and the length L of the movable iron piece e. In order to increase the amount of movement S of the movable member f, the gap M between the iron core d and the movable iron piece e may be increased, or the length L of the movable iron piece e may be increased.

If the gap M between the former iron core d and the movable iron piece e is increased, the magnetic force will decrease (the magnetic force is inversely proportional to the square of the gap M). It is necessary to increase the magnetic force by flowing current, which increases the size of the entire device, and because the coil generates heat due to the flow of a large amount of current, a cooling mechanism is required, making the configuration complicated. Costs increase over time.

Furthermore, if the latter length L of the movable iron piece e is increased, the entire device becomes larger, and the mass of the movable iron piece e also increases by the lengthened length, so that the magnetic force must be increased.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electromagnetic adsorption device that is small in size and operates with a small amount of current, yet allows a large amount of movement of a moving member.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the electromagnetic attraction device of the present invention includes an electromagnet having an iron core whose both end faces are located on the same plane, and an electromagnet that is attracted to each end face of the iron core. and a moving member that engages with a rotating end of the first movable iron piece, the rotating axes of the first and second movable iron pieces being orthogonal to each other. , and the intermediate portion of the first movable iron piece and the rotating end portion of the second movable iron piece are connected to each other.

(Operation) When the electromagnet is energized, the first and second movable iron pieces are attracted to the end face of the iron core and interlock with each other, and the moving member moves largely as the first movable iron piece rotates.

(Example) An example of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of the electromagnetic adsorption device of the present invention, and FIG. 2 is a sectional view taken along the line - in FIG. In both figures, 1 is a mounting board, and an electromagnet 2 is attached to the top surface of the mounting board. The electromagnet 2 is
It consists of an iron core 3 and a coil 4. The iron core 3 has a U-shape, and both end surfaces 3a and 3b thereof are located on the same plane. The coil 4 is formed by wrapping an electric wire 6 around the outer periphery of a bobbin 5 having a fitting hole 5a in the center. The electromagnet 2 is configured by fitting and fixing one side piece 3c of the iron core 3 into the fitting hole 5a of the bobbin 5, and the other side piece 3d of the iron core 3 is fixed to the upper surface of the mounting board 1. ing.

Located near one side of the electromagnet 2 and on the upper surface of the mounting board 1 are first and second movable iron pieces 7 and 8.
is provided. The first movable iron piece 7 has a substantially T-shape in which a sub-body 10 in the form of an elongated plate is integrally connected to an approximately intermediate portion in the longitudinal direction of the main body 9 in the form of an elongated plate. A surface 9a of the main body 9 at a substantially intermediate portion in the longitudinal direction
is deviated outward from the surface 9b of the other portion via the step portions 9c, 9c. A surface 9a of the main body 9 at an approximately intermediate portion in the longitudinal direction and a surface 10a of the sub-body 10 are continuous and uniform surfaces. By loosely fitting the lower end 9d of the main body 9 into the slit 11 bored in the mounting board 1, the first movable iron piece 7 rotates the lower end 9d of the main body 9 with respect to the mounting board 1. It is mounted as a fulcrum so as to rotate by a predetermined angle in a direction toward and away from the electromagnet 2. The second movable iron piece 8 is formed by integrally providing bracket pieces 13, 13 on both widthwise side edges of a base end 12a of a main body 12 in the shape of an elongated plate, facing each other.
By rotatably fitting the center holes of these bracket pieces 13, 13 onto the mounting shaft 14 protruding from the upper surface of the mounting board 1, the second movable iron piece 8 is attached to the mounting shaft 14 with respect to the mounting board 1. It is mounted so as to be rotated by a predetermined angle in a direction toward and away from the electromagnet 2 about the electromagnet 14.

The rotation axis of the first movable iron piece 7 and the rotation axis of the second movable iron piece 8 are orthogonal to each other. The tip portion (rotating end portion) 12b side of the second movable iron piece 8 from the approximately intermediate portion in the longitudinal direction of the main body 12 is located on the inner surface side of the sub-body 10 of the first movable iron piece 7, and It is located along the The tip portion (rotating end portion) 12b of the main body 12 of the second movable iron piece 8 is connected to a connecting portion 15 provided at the extending end portion 10b of the sub body 10 of the first movable iron piece 7 so as to be able to move slightly. has been done. The connecting portion 15 is composed of connecting walls 15a that are connected to both sides in the width direction of the extending end portion 10b of the sub-body 10 of the first movable iron piece 7, and the connecting portion 15 is formed in a space surrounded by the connecting walls 15a. the second movable iron piece 8
The leading end portion 12b of the main body 12 is inserted and connected.

The inner surface of the first movable iron piece 7 on the lower end side of the substantially intermediate portion in the longitudinal direction comes into contact with and separates from one end surface (lower end surface in the figure) 3a of the iron core 3. Further, the inner surface of the second movable iron piece 8 at a substantially intermediate portion thereof in the longitudinal direction comes into contact with and separates from the other end surface (the upper end surface in the figure) 3b of the iron core 3.

The upper end portion (rotating end portion) 9e of the main body 9 of the first movable iron piece 7 is engaged with an engaging portion 17 formed of a notch provided in the moving member 16. As the first movable iron piece 7 rotates, the moving member 16 moves in the left-right direction in FIG.

Next, the operation of the electromagnetic adsorption device of the present invention having the above structure will be explained. When the coil 4 of the electromagnet 2 is not energized, the first and second movable iron pieces 8, 9 and the moving member 16 are in the state shown by solid lines in FIGS. 1 and 2.

In this state, when the coil 4 is energized, the iron core 3 is magnetized, and the first and second movable iron pieces 7 and 8 are attracted to each end surface 3a, 3b of the iron core 3 by the magnetic force, and the first and second movable iron pieces 7 and 8 rotate toward the electromagnet 2 side in conjunction with each other, and with this rotation, the movable member 16 moves to the left in FIG. 2, and the first and second movable iron pieces 7, 8 and the Part 1
6 is in the state shown by the two-dot chain line in FIG.

In such a suction operation, the first and second movable iron pieces 7 and 8 interlock with each other, so that the amount of rotation of the first movable iron piece 7 increases, and accordingly, the amount of movement of the moving member 16 increases.

(Effect of the invention) As described above, the electromagnetic adsorption device of the invention includes an electromagnet having an iron core whose both end faces are located on the same plane, and first and second movable magnets that are respectively attracted to each end face of the iron core and rotated. an iron piece, and a moving member that engages with a rotating end portion of the first movable iron piece, the rotation axes of the first and second movable iron pieces are orthogonal to each other, and an intermediate portion of the first movable iron piece is provided. and a rotating end portion of the second movable iron piece are connected to each other.

Therefore, although the device is small and operates with a small amount of current, the amount of movement of the moving member is large.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an electromagnetic adsorption device showing an embodiment of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is the same as Fig. 2 of the conventional electromagnetic adsorption device. It is a diagram. 2... Electromagnet, 3... Iron core, 3a... One end surface,
3b...Other end surface, 7...First movable iron piece, 8...Second movable iron piece, 9e...Upper end (rotating end) of first movable iron piece, 10...Sub-body, 10b...First Extending end portion of the movable iron piece, 12b...Distal end portion (rotating end portion) of the second movable iron piece 16...Moving member.

Claims (1)

[Claims for Utility Model Registration] 1. An electromagnet having an iron core with both end faces located on the same plane, first and second movable iron pieces that are attracted to each end face of the iron core and rotate, and the first movable iron piece. a moving member that engages with the rotating end of the iron piece, the rotation axes of the first and second movable iron pieces are orthogonal to each other, and the intermediate part of the first movable iron piece and the second movable iron piece are An electromagnetic adsorption device characterized in that rotating ends are connected to each other. 2. Utility model registration characterized in that the first movable iron piece has a T-shape with its intermediate portion extended laterally, and the extended end is connected to the rotating end of the second movable iron piece. An electromagnetic adsorption device according to claim 1.