JP2503613Y2 - Moving coil actuator - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving coil actuator, and more particularly to a moving coil actuator with improved assembling accuracy.

[0002]

2. Description of the Related Art A conventional moving coil actuator will be described with reference to FIG. The figure shows a head carriage portion of an XY plotter, and 1 is a head carriage which travels on a vertical rail (not shown) and freely moves in the XY directions on the screen. The slider 2 on the head carriage 1
Is mounted so as to be able to move up and down, and is urged upward by the coil spring 3. A pen holder 4 is provided on the slider 2 so that a writing instrument such as an ink pen or a pencil can be attached thereto.

A moving coil actuator 5 is interposed between the head carriage 1 and the slider 2, and the control unit (not shown) controls the elevation of the slider 2. A magnetic circuit 6 is mounted on the head carriage 1 side, and the slider 2
The moving coil 7 is mounted on the side. In the magnetic circuit 6, a pole 9 having a cylindrical magnet is fixed to the central bottom of a cup-shaped yoke 8, and a moving coil 7 is loosely inserted in a gap between the pole 9 and the yoke 8. The cylindrical moving coil 7 is fixed to a cup- or disc-shaped mounting plate 10, and a screw 11 inserted from the upper surface of the slider 2 is screwed into a screw hole 12 formed in the central portion of the mounting plate 10 to move the moving coil. 7 is fixed to the slider 2.

[0004]

In the above-described conventional moving coil actuator, it is not easy to align the magnetic circuit with the moving coil, and the moving coil is mounted eccentrically with respect to the magnetic circuit. May come into contact with the pole or yoke of.
In this case, if the operation of the moving coil is repeated,
If the insulating coating on the winding of the moving coil is peeled off due to contact with the magnetic circuit, a short circuit may occur via the yoke or pole, resulting in an unusable accident.

Therefore, there arises a technical problem to be solved in order to improve the assembling accuracy of the magnetic circuit and the moving coil, and to facilitate the assembling to improve the yield and reliability of the product. Therefore, the present invention is intended to solve the problems.

[0006]

This invention is proposed to achieve the above-mentioned object, and a magnetic circuit 29 composed of a pole 34 and a yoke 33 and a gap between the pole 34 and the yoke 33 is provided. In the moving coil actuator 31 constituted by the fitted moving coil 30, the concave portion 39 and the convex portion 40 are provided on the respective facing surfaces of the mounting plate 35 fixed to the outer end portion of the moving coil 30 and the magnetic circuit 29. Positioning means such as
A moving coil actuator is provided in which the mounting plate 35 is pressed against the magnetic circuit 29 so that the positioning means aligns the axes of the moving coil 30 and the pole 34 with each other. is there.

[0007]

Function: Positioning means such as a concave portion and a convex portion are provided on the opposing surfaces of the mounting plate fixed to the outer end of the cylindrical moving coil and the magnetic circuit. When assembling the moving coil actuator, attach the magnetic circuit to the fixed side base, insert the open end of the moving coil into the cylindrical space between the magnetic circuit pole and the yoke, and attach the moving coil mounting plate. Is temporarily fixed to the slider on the movable side. Then, the slider is pushed to further insert the moving coil into the magnetic circuit, and the mounting plate is pressed into contact with the magnetic circuit. By the positioning means, the relative displacement between the magnetic circuit and the moving coil is corrected, and the axial centers of both sides are corrected. Match. If the mounting plate of the moving coil is fixed to the slider in this state, the moving coil is fixed at an appropriate position with respect to the magnetic circuit.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a head portion of an XY plotter, in which a head carriage 23 is attached to a Y rail 22 which moves on a drawing board 21 along an X rail (not shown) in the X axis direction (left and right direction in the figure). There is. The head carriage 23 runs on the Y rail 22 in the Y-axis direction (front-back direction in the figure), and
As the rail 22 moves in the X-axis direction, it moves on the drawing board 21
It can move freely in the -Y direction.

A guide roller 24 is projectingly provided on the right wall surface of the head carriage 23, and a guide shaft 25 is provided upright near the left edge portion. A slider 26 forming a pair with the head carriage 23 is loosely fitted to the guide roller 24 and the guide shaft 25, and a coil spring 27 is interposed to urge the slider 26 upward, and at the upper end of the guide shaft 25. The retaining ring 28 is fitted to the slider 2
It is supposed to be 6 retainer.

A moving coil actuator 31 is composed of a magnetic circuit 29 attached to the central portion of the upper surface of the head carriage 23 by means of screwing or spot welding, and a moving coil 30 screwed to the lower surface of the slider 26. The slider 26 is moved up and down by the control current from the control unit of the XY plotter to control in the Z-axis direction. A pen holder 32 is provided at the left end of the slider 26.
Is provided, and an image is drawn on the paper on the drawing board 21 by an ink pen, a pencil or the like attached to the pen holder 32.

In the magnetic circuit 29, a pole 34 of a columnar magnet is fixed to the central bottom of a cup-shaped yoke 33. A mounting plate 35 is fixed to the upper end of the moving coil 30, a screw hole 36 is opened in the center of the mounting plate 35, and the moving coil 30 is fixed to the slider 26 with a screw 37. The screw hole 38 formed in the slider 26 is slightly larger than the diameter of the screw 37 and has a slight clearance.
The mounting position of can be finely adjusted to the front, rear, left and right. An inverted conical recess 39 is provided at the center of the top surface of the pole 34, and a projection 40 concentric with the pole 34 is provided at the center of the bottom surface of the mounting plate 35.
Is provided.

This moving coil actuator 31
When assembling, first temporarily assemble in the state shown in FIG.
Loosen 7. Next, as shown in FIG.
When 6 is pushed down, the concave portion 39 of the pole 34 and the convex portion 40 of the mounting plate 35 are engaged with each other, and the mounting plate 35 and the moving coil 30 are automatically aligned with the yoke 33 and the pole 34. If the screw 37 is tightened in this state, the moving coil 30 is attached to the pole 34 and the yoke 33 without eccentricity, and the pole 34 and the yoke 33 are attached.
There is no contact with.

FIGS. 3 to 5 show other embodiments, respectively. In FIG. 3, the concave portion is a circular hole 41 and the convex portion is a column 42. In FIG. 4, the outer peripheral portion of the tip of the pole 43 is cut out to form a sloped portion 43a, and a sloped portion 45a corresponding to the sloped portion 43a is formed on the inner peripheral surface of the mounting plate 45 of the moving coil 44 so as to be aligned. I have to. or,
In FIG. 5, a circular hole 48 into which the tip of a screw 47 for fixing the moving coil can be inserted is provided in the center of the upper surface of the pole 46. As described above, the shapes of the positioning means for the poles and the yoke and the moving coil can be modified in various ways, and it goes without saying that the invention extends to those modifications.

[0014]

Since the present invention is configured as described in detail in the above one embodiment, the core of the magnetic circuit and the moving coil is not affected by the working accuracy of the member on which the moving coil actuator is mounted. The alignment is extremely easy and accurate. Therefore, the occurrence of improper assembly is prevented, the productivity is improved by improving the fraction retention, and
The burden of quality control of the members to be mounted is also reduced, which contributes to cost reduction and reliability, and other effects.

[Brief description of drawings]

[Figure 1] X equipped with a moving coil actuator
Sectional drawing of the principal part of a Y plotter.

FIG. 2 is a cross-sectional view of an essential part showing a positioning action at the time of assembling a moving coil actuator.

FIG. 3 is a cross-sectional view of a moving coil actuator showing another embodiment.

FIG. 4 is a sectional view of a moving coil actuator showing another embodiment.

FIG. 5 is a cross-sectional view of a moving coil actuator showing another embodiment.

FIG. 6 is a sectional view of a conventional moving coil actuator.

[Explanation of symbols]

 29 Magnetic Circuit 30 Moving Coil 31 Moving Coil Actuator 33 Yoke 34 Pole 35 Mounting Plate 36 Screw Hole 37 Screw 38 Screw Hole 39 Recess 40 Convex

Claims (1)

(57) [Scope of utility model registration request] 1. A moving coil actuator 31 constituted by a magnetic circuit 29 including a pole 34 and a yoke 33, and a moving coil 30 loosely fitted in a gap between the pole 34 and the yoke 33. Positioning means such as a concave portion 39 and a convex portion 40 are provided on the respective facing surfaces of the mounting plate 35 fixed to the outer end of the magnetic circuit 29, and the mounting plate 35 is pressed against the magnetic circuit 29 during assembly. By so doing, the positioning means is formed such that the axes of the moving coil 30 and the pole 34 are aligned with each other.