JPH028544B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a linear pulse motor suitable for use in, for example, feeding the head of a floppy disk device.

[Prior Art] In recent years, office automation (OA) has become popular, and floppy disk devices are widely used as storage devices. Linear pulse motors are often used to move the heads of these floppy disk devices, and there is a strong demand for smaller, cheaper, and thinner motors. Therefore, the present applicant previously proposed a linear pulse motor that achieves the above requirements in Japanese Patent Application No. 59-47863.

3 and 4 are perspective views showing an example of the configuration of a linear pulse motor similar to the linear pulse motor according to the above proposal. In these figures, 1 is a mover made of mild steel or the like, 2 is a stator, and the lower surface of this mover 1 is formed with comb-shaped mover teeth 1a.

On the other hand, the stator 2 sequentially attracts the mover teeth 1a by sequentially switching magnetic poles with increasing magnetic flux through the interaction between the permanent magnet 3 and the electromagnet, thereby causing the mover 1 to reciprocate in a stepwise manner. , consists of the following structure.

First, on the lower side of the mover 1, opposite to this,
A slit plate 4 is arranged, and below the slit plate 4, a yoke 6 to which electromagnetic coils 5, 5 are fixed, and a permanent magnet 3 having an H-shape in plan view are fixed in this order. A cross-shaped groove is formed in the center of the yoke 6, which allows the four magnetic poles 6a, 6b, 6
c, 6d are formed. Moreover, the magnetic poles 6a, 6
Comb-shaped pole teeth 4a, 4b, 4 are located on the slit plate 4 directly above the poles b, 6c, and 6d.
c and 4d are formed and face the moving element teeth 1a of the moving element 1 with an extremely small gap therebetween.

This gap is formed by a pair of linear bearings 7, 7 arranged on both sides of the slit plate 4.
is mounted, and the linear bearing 7 and the slider 1 are fitted so as to be movable in the longitudinal direction along a guide path formed by the slit plate 4 and the guides 8, 8. Further, the guides 8, 8, the slit plate 4, the yoke 6, and the coils 5, 5 are connected to each other by screws 10, 10, . . . and are integrated.

FIG. 5 is a perspective view showing the configuration of the linear bearing 7. As shown in the figure, the linear bearing 7 includes a pair of rollers 11, 11, balls 12,
12 and a retainer 13 that holds them.The rollers 11, 11 are connected to the openings 14, 14.
The balls 12, 12 are rotatably fitted into the recesses 15, 15, respectively. In FIG. 4, 16 is a stopper that is bent upward to restrict movement of the linear bearing 7, and 18 is a back plate for forming a magnetic path for the permanent magnet 3.

According to the above configuration, both sides of the lower surface of the slider 1 come into contact with the rollers 11, 11 of the linear bearing 7,
Further, both side edges of the mover 1 abut against the balls 12, 12. Then, the movable tooth 1a and the pole teeth 4a, 4
b, 4c, and 4d face each other with a slight gap in between. In this state, when a predetermined pulsed current is supplied to the coils 5, 5, the mover 1 moves stepwise and linearly on the stator 2.

[Problems to be Solved by the Invention] By the way, when the above-mentioned linear pulse motor is used as a head feeding motor of a floppy disk device, high positioning accuracy is required. In order to obtain high positioning accuracy, the mover tooth 1a and each pole tooth 4a, 4b, 4c,
The parallelism between 4d and 4d is an extremely important factor.
For example, as shown by the dotted line T in FIG.
If a is no longer parallel to each of the pole teeth 4a, 4b, 4c, and 4d, and a deviation as shown by l occurs from the normal position, the positioning accuracy will decrease. However, in the conventional linear pulse motor described above, after the slit plate 4 on which the pole teeth 4a, 4b, 4c, and 4d are formed is superimposed on the yoke 6, the guides 8 and 8 are attached to the slit plate 4 and the yoke 6. And the coils 5, 5 are fixed by screws 10, 10, etc., and in this way, simply screws 10, 1
If the positional relationship between the slit plate 4 and the guides 8, 8 is adjusted by 0..., it will not be possible to obtain an accurate positional relationship between the slit plate 4 and the guides 8, 8 during assembly. Gattete, guide 8,8
The moving direction of the moving element 1 is defined by the moving tooth 1a of the moving element 1 and each pole tooth 4a, 4b, 4 of the slit plate 4.
There was a drawback that sufficient parallelism between the lines c and 4d could not be obtained.

This invention was made in view of the above-mentioned circumstances, and it is possible to perform accurate positioning between the tooth forming member forming the pole teeth and the guide member guiding the slider, thereby achieving high positioning accuracy. The purpose is to provide a linear pulse motor that can obtain

"Means for Solving the Problems" This invention provides a plate-shaped magnetic pole having a plurality of magnetic poles to which a permanent magnet and an excitation coil are attached, and which sequentially generates magnetic flux through the interaction of these permanent magnets and excitation coil. a tooth-forming plate that is superimposed on the plate-shaped magnetic pole member to form a tooth on each magnetic pole; and a pair of guides that are superimposed and attached on the tooth-forming plate and face each other at a predetermined distance apart. a pair of linear bearings disposed in contact with opposing surfaces of the pair of guide members, and a member that is movable in the longitudinal direction while movement in the width direction is restricted by the pair of linear bearings. In a linear pulse motor that is supported and has a slider in which a tooth portion is formed opposite to the tooth portion with a predetermined gap therebetween, the guide member is provided with a convex portion, and the tooth portion forming plate is provided with the convex portion. It is characterized by providing a reference surface that engages with.

"Function" Since the positional relationship between the tooth forming plate and the guide member can be adjusted accurately, the tooth part of the slider whose moving direction is defined by the guide member and the tooth forming plate can be aligned accurately. In this way, an accurate positional relationship between the formed teeth of each magnetic pole can be obtained.

"Embodiments" Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing the structure of an embodiment of the present invention. As shown in this figure, a pair of prismatic protrusions 8a, 8a are provided on the surfaces of the pair of guides 8 that are superimposed on the slit plate 4 and are opposed to each other at a predetermined distance apart from each other. Each is formed. In this case, each convex portion 8a, 8
a is such that the imaginary line A along each side of each side is relative to the imaginary line B along the opposing surface of the guide 8, that is, the surface that guides the slider 1 via the ball 12 of the linear bearing 7 (see FIG. 5). They are each formed so that they are parallel to each other. On the other hand, the slit plate 4 is formed with reference holes 4e, 4e, . . ., which fit into convex portions 8a, 8a, . In this case, as shown in FIG.
e, 4e..., the imaginary lines C and D along each of their outer sides are the respective magnetic pole teeth 4a, 4 of the slit plate 4.
They are formed perpendicularly to the imaginary line E that is parallel to b, 4c, and 4d.

In the above configuration, the screw 1 is similar to the conventional linear pulse motor shown in FIGS. 3 and 4.
0, 10... guides 8, 8, slit plate 4, yoke 6, coils 5, 5 are fixed and integrated. At this time, each convex portion 8a, 8a of the guides 8, 8...
are fitted into the respective reference holes 4e, 4e, .
Accurate positional relationship with 8a can be obtained, thereby
The mover teeth 1a formed on the mover 1 whose moving direction is defined by the guides 8, 8, and the slit plate 4
The parallelism between the pole teeth 4a, 4b, 4c, and 4d can be obtained with extremely high precision.

Next, another embodiment of the present invention will be described with reference to FIG. As shown in this figure, in place of the convex portion 8a in the above-described embodiment, a movable element 1
A convex portion 8a' is formed along the surface (imaginary line B) that contacts via the ball 12 (FIG. 5), and in place of the reference hole 4e in the above-described embodiment, imaginary lines C and D are formed. Convex reference protrusions 4e' are formed along parallel imaginary lines C' and D', and these reference protrusions 4e' formed on the slit plate 4 and protrusions 8a' formed on the guide 8 engage with each other. It's starting to match. As a result, the convex portion 8a' serving as a reference coincides with the surface guiding the ball 12, so there is only one machining area that requires precision, improving positioning accuracy and reducing manufacturing costs. . Further, instead of the reference hole 4e described above, a convex portion may be provided along the imaginary lines C and D from the outer peripheral edge of the slit plate 4, and a convex portion 8a that engages with this convex portion may be provided on the guide 8. .

"Effects of the Invention" As explained above, according to the present invention, the guide member that defines the moving direction of the slider is provided with a convex portion, and the tooth forming plate is provided with a reference surface that engages with the convex portion. As a result, an accurate positional relationship between the tooth forming plate and the guide member can be obtained, and thereby the tooth formed by the tooth forming plate and the tooth formed on the slider can be Parallelism can be obtained with extremely high accuracy, and therefore, the effect of obtaining high positioning accuracy can be obtained.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the structure of an embodiment of the present invention, FIG. 2 is a perspective view showing the structure of the slit plate 4 of the same embodiment, and FIG. 3 is a perspective view showing the structure of a conventional linear pulse motor. Figure 4 is an exploded perspective view showing the configuration of the linear pulse motor, Figure 5 is a perspective view showing the configuration of the linear bearing of the linear pulse motor, and Figure 6 is the linear pulse motor's moving child tooth and fixed FIG. 7 is a perspective view showing the structure of another embodiment of the present invention. 1... Mover, 1a... Mover tooth, 2... Stator, 4... Slit plate (tooth forming plate), 4a, 4
b, 4c, 4d...Pole teeth (tooth portion), 4e...Reference hole, 6...Yoke (plate-shaped magnetic pole member), 7...Linear bearing, 8...Guide (guiding member), 8a
...Protrusion.

Claims (1)

[Claims] 1 A permanent magnet and excitation coil are attached,
A plate-shaped magnetic pole member having a plurality of magnetic poles that sequentially generate magnetic flux through the interaction of these permanent magnets and excitation coils, and a tooth forming plate that is superimposed on the plate-shaped magnetic pole member to form teeth on each magnetic pole. and a pair of guide members that are mounted on the tooth forming plate in an overlapping manner and face each other with a predetermined distance apart;
a pair of linear bearings disposed in contact with opposing surfaces of the pair of guide members, and supported so as to be movable in the longitudinal direction while movement in the width direction is restricted by the pair of linear bearings; In the linear pulse motor, the linear pulse motor has a slider in which the tooth portion and the tooth portion facing each other are formed with a predetermined distance apart, the guide member is provided with a convex portion, and the tooth portion forming plate is engaged with the convex portion. A linear pulse motor characterized by having a matching reference surface.