JPS58138005A - Electromagnetic attracting device - Google Patents

Abstract

PURPOSE:To decrease impact sound and impact force at attracting state and lengthen the life of attracting mechanism, by a method wherein plural coils are driven at the timing difference and one movable piece is driven. CONSTITUTION:A switch 14 of an electromagnetic attracting member 10 having a short core 12 is turned on thereby a movable piece 11 is attracted. Then the movable piece 11 is moved to the position of dotted line and stopped by impinging on a core 22 of an electromagnetic attracting member 20. Since the holding attracting member is not energized then and the electromagnetic attraction does not act between the movable piece 11 and the core 22, the force acting on the movable piece does not rise abruptly and therefore the impact sound is relatively small. And then a switch 24 of the electromagnetic attracting member 20 is turned on thereby the core 22 is energized and the movable piece 11 is attracted. Next, the switch 14 is turned off and the switch 24 remains on and conducting state of a coil 23 is continued thereby the holding attraction is maintained without impinging of the movable piece 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic adsorption device, and particularly to an electromagnetic adsorption device that attracts a movable element by exciting an electromagnetic adsorption part in which a plurality of coils are wound.

Conventionally, such an electromagnetic adsorption device has been applied to various fields such as a magnetic disk drive load mechanism as an lenoid. Conventionally, such an electromagnetic adsorption device uses electromagnetic force generated by energizing a coil 2 wound around an iron core 1 via a switch 3 to adsorb a mover 4, as shown in FIG. 1, for example. Usually, there is only one suction part made of an iron core around which a coil is wound, so as the mover approaches the coil iron core during suction, the suction force acting on both increases rapidly, and when the two collide, a large amount of force is generated. Not only does it make a noise, but also the impact force is large, causing noise, and in some cases, it may damage equipment that uses the electromagnetic adsorption device, and the life of the electromagnetic adsorption device cannot be maintained for a long time.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an electromagnetic adsorption device that can eliminate such conventional drawbacks, reduce impact noise and impact force during adsorption, and at the same time extend the life of the adsorption mechanism.

According to the present invention ζζ, in order to achieve this object, a plurality of coils are driven at different times, and at least two electromagnetic attraction parts are provided, and one of the electromagnetic attraction parts is excited to move the mover. After the attracted movable element is stopped by the other electromagnetic attraction part, the other electromagnetic attraction part is energized to attract and hold the movable element.

The present invention will be described in detail below according to embodiments shown in the drawings.

An embodiment of the invention is illustrated in FIGS. 2 and 3, and identical or similar parts in each figure are designated by the same reference numerals.

The coil 13 is wound around the coil 12, the switch 14 is turned on, and the coil 13 is energized from the power source 16, thereby exciting the iron core 12.
The electromagnetic attraction section 20 is configured to wind a coil 23 around the iron core 22, and turn on a switch 24 from a power source 26 to energize the coil, thereby exciting the iron core 22. As shown in FIG. 2, each iron core 12, 22 is arranged substantially parallel to one end of the movable element 11, so that no matter which electromagnetic attraction part is excited, the movable part 11
can be sucked and held. In this case, the iron cores 12 and 22 are configured to have different lengths, and in this embodiment, the iron core 22 is configured to be longer than the iron core 12.

In such a configuration, first, the switch 14 of the electromagnetic attraction section 10 having the short iron core 12 is turned on to attract the movable element 11. In this case, the attracted mover 11
moves to the position indicated by the dotted line, collides with the iron core 22 of the electromagnetic attraction part 20, and stops. At this time, since the holding suction part is not yet excited, no electromagnetic attraction force is acting between the mover 11 and the iron core 22, so the force acting on the mover 11 does not suddenly increase and causes an impact. The sound is also relatively quiet. Thereafter, by turning on the switch 24 of the electromagnetic attraction section 20, the iron core 22 is excited and the movable element 11 is attracted. In this state, mover 1
Since the iron core 1 and the iron core 22 are in contact with each other, sufficient holding force can be obtained. Thereafter, the switch 14 is turned off, and the coil 23 is energized while the switch 24 is turned on to hold and attract the movable element 11.

The embodiment shown in FIG. 3 has a structure in which two electromagnetic attraction parts are arranged vertically, and as in FIG. After stopping the movable element 11, the electromagnetic attraction section 20 is subsequently excited to attract the movable element 11.

In each of the embodiments described above, two electromagnetic attraction parts are provided, but depending on the case, a plurality of electromagnetic attraction parts may be provided.

As explained above, according to the present invention, at least two electromagnetic attraction parts are provided, one of the electromagnetic attraction parts is excited to attract the mover, the other electromagnetic attraction part is stopped, and then the other electromagnetic attraction part is stopped. By adopting a configuration in which the adsorption part is excited to hold and adsorb the mover, an electromagnetic adsorption device that can extend the life of the electromagnetic adsorption mechanism without generating large impact force or collision noise during suction can be obtained. .

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the configuration of a conventional electromagnetic adsorption device;
FIGS. 2 and 3 are explanatory diagrams showing different embodiments of the electromagnetic adsorption device of the present invention. 11...Mover, 12.22...Iron core, 13.23
...Coil, 14.24...Switch.

Claims (2)

[Claims] (1) An electromagnetic adsorption device characterized in that a single movable element is driven by driving a plurality of coils at different times. (2) At least two electromagnetic attraction parts are provided, one electromagnetic attraction part is energized, the movable element is stopped by the other electromagnetic attraction part, and the other electromagnetic attraction part is energized to attract and hold the mover. An electromagnetic adsorption device according to claim 1, characterized in that: