JPS61293152A - Moving member guiding mechanism for linear pulse motor - Google Patents

Abstract

PURPOSE:To prevent a retainer from being positionally shifted, by controlling the movement of the retainer always with the first and the second rack gears and pinion gears. CONSTITUTION:On the central section on the upper face of a base 53, a shaft 53a and the base 53 are integrally formed, and a pinion gear 54 is rotatably fitted on the shaft 53a, and on the upper section of the gear 54, a retaining ring 55 for preventing the gear 54 from being separated from is fitted. When retainers 32, 32 are inserted between a mover 30 and a stator 31, then the pinion gears 54, 54 are fitted on rack gears 34, 44, and on rack gears 35, 45, respectively. By said organization, the movement of the retainer 32 is controlled by the pinion gear 54, and sliding movement between the stator 31 and the retainer 32 is not generated, and the moving degree of the retainer 32 is always kept to 1/2 of the moving degree of the mover 30.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Commercial Use] The present invention relates to a slider guide mechanism for a linear pulse motor used, for example, for moving the head of a floppy disk device.

[Prior art]

For example, linear pulse motors used in floppy disk devices and the like are required to be smaller, less expensive, and thinner. Therefore, the applicant of the present invention first proposed a "Supporting mechanism for a moving element in a linear pulse motor" ← Japanese Patent Application No. 1983-
No. 47865) was filed. Hereinafter, the present invention will first be described in detail.

FIG. 4 is a perspective view showing an example of the configuration of the linear pulse motor according to the invention of the prior application. In this figure, reference numeral 1 denotes a mover, 2 a stator, and a comb-shaped tooth portion 1a is formed on the lower surface of the mover 1.

Next, in the stator 2, numerals 3 and 4 are coils, and 5.6
is a core, and the ends of the core 5 are provided with circular magnetic poles 5a and 5b.
However, mm-shaped magnetic poles 6a and 6b are formed at the ends of the core 6, respectively. 7 is a permanent magnet, 8 and 9 are guide members, and these guide members 8 and 9 form a travel path for the moving element I.

The guide member 8 is supported by pins 11 and 12 vertically disposed on the upper surface of the core 5 so as to be slidable in the width direction of the running path, and both ends thereof abut against the pins 11 and 12.
The central portion is biased by a leaf spring 13 in contact with the guide member 8 in a direction that spans the width of the traveling path. Further, the guide member 9 is fixed to the upper surface of the core 6 by pins 14 and 15. A retainer (holding member) 21 having rollers 17, 18 and balls 19, 20 is placed between the guide member 9 and the magnetic poles 5a, 5b.

A similar retainer is also placed between the guide member 8 and the magnetic poles 5a, 5b. Incidentally, FIG. 5 shows the mounting structure of the roller 18 and the ball 20.

As shown in the figure, the ball 20 is loosely fitted into four parts 23 each having a spherical inner surface. Further, 24 in FIG. 4 is a stopper that restricts the movement of the retainer 21.

In the above configuration, the mover 1 has magnetic poles 5a and 5b.

When placed on the sliders 6a and 6b, both downward sides of the slider 10 abut against the rollers 17 and 18 of the retainer 21, and both side edges thereof abut against the balls 19 and 20.

Then, the tooth portion 1a and the magnetic pole 5. ．． 6b face each other with a slight gap. Here, when a predetermined pulsed current is supplied to the coils 3 and 4, the mover 1 moves on the stator 2 in a step manner.

[Problem that the invention seeks to solve]

Although the above-mentioned linear pulse motor is extremely superior in that it can be constructed in a small size, low cost, and thin shape, it still has the following problems. That is, in the linear pulse motor described above, when the mover 1 moves, the retainer 21 also moves #.
move. The amount of movement of this retainer 21 is theoretically 172 times the amount of movement of the mover 1. However, during actual operation, the flatness of the surfaces in contact with the rollers 17 and 18, the quality of machining such as roughness, and disturbances caused by dirt, dust, and even scratches that accumulate on the same surface. As a result, a slip occurs between the rollers 17, 18 and the surfaces in contact with them, and this causes a difference in the amount of forward and return movement. Therefore, if the operation is continued for a long time, the above-mentioned difference in reciprocation will accumulate, and the position of the retainer will gradually change to its original position.
i (that is, a position that is 1/2 of the amount of movement of the mover 1), and the moving stroke of the mover 1 cannot be secured (in the worst case, the mover 1 may become unable to move).

SUMMARY OF THE INVENTION An object of the present invention is to provide a guide mechanism for a moving element of a linear pulse motor in which the position of a moving body such as a retainer does not deviate from its original position.

[Means for solving the problem] - The present invention includes a mover, a stator, a rolling element inserted between the mover and the stator, and a holding member that holds the rolling element. In the linear pulse motor, a first rack gear is formed on a surface of the mover facing the stator, a second rack gear is formed on a surface of the stator facing the first rack gear, and the first rack gear is formed on a surface of the stator facing the first rack gear. 1. The present invention is characterized in that a pinion gear meshing with each of the second rack gears is provided, and the pinion gear is rotatably attached to the holding member.

[For production]

In this invention, the movement of the holding member (for example, the retainer) is always the first. Since it is regulated by the second rack gear and pinion gear, the amount of movement of the holding member always corresponds to the amount of movement of the slider.

〔Example〕

FIG. 1 is a perspective view showing the appearance of a linear pulse motor according to an embodiment of the present invention, and FIG. 2 is a perspective view showing the appearance of a retainer 32. In FIG. 1, the reference numeral 30 is a movable element having toothed portions 30a formed on the lower surface, similar to the #4 moving element l shown in the fourth part, and the reference numeral 31 is a movable element having substantially the same structure as the stator 2 shown in FIG. 4. The retainer 32, 32 shown in FIG. 2 is inserted between the mover 30 and the stator 31. A gear plate 33 is fixed to the upper surface of the mover 30, and rack gears 34 and 35 having the same pitch are formed on both sides of the gear plate 330, respectively. Stator 3
1, reference numerals 37 and 38 denote slider guide members arranged a above the coils 39 and 39 and fixed to the core 41 and 42 with screws 40.40 and 40.40, respectively, and the rack gear of the slider guide member 37. On the side facing 34,
A rack gear 44 having the same pitch as the rack gear 34 is formed, and a rack gear 45 having the same pick as the rack gear 35 is formed on the side surface of the mover guide member 38 facing the rack gear 35.

Next, in the retainer 32 shown in FIG.
is the roller, 49.50 is the ball, 51 and 52 are the balls 4
9 and 50, and the structure thereof is substantially the same as that of the retainer 21 shown in FIG. 4. 5
3 is a ball holding member 51, 52 on the upper surface of the retainer 21;
It is a rectangular parallelepiped plastic base mounted at an intermediate position.

At the center of the upper surface of this base 53, as shown in FIG. 3, a shaft 53a is formed integrally with the base 53.
A pinion gear 54 is rotatably attached to this shaft 53a, and a retaining ring 55 that prevents the pinion gear 54 from coming off is attached above it. When the retainers 32, 32 described above are inserted between the mover 30 and the stator 31, the pinion gears 54, 54 are connected to the rack gears 34 and 44, the rack gears 35 and 45 as shown in FIG.
mesh with each other.

According to the above configuration, the movement of the retainer 32 is regulated by the pinion gear 54, so that slippage between the stator 31 and the retainer 32 does not occur.
The amount of movement of the retainer 32 is always 17 times the amount of movement of the mover 30.
It is kept at 2.

Note that instead of the shaft 53 formed integrally with plastic on the base 53 on the upper surface of the retainer 32, a metal shaft may be embedded in the front base 53.

Further, the positions where the rack gears 341.35 and 44.45 are formed are not limited to those in the embodiment, but may be formed on opposing surfaces sandwiching the horizontal surface of the retainer, so that the pinion gear is held on the retainer.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to prevent the retainer from shifting with an extremely simple configuration. As a result, there is no need to increase the machining accuracy of the surface of the retainer that the rolling elements come into contact with more than necessary, thereby improving the productivity of the linear pulse motor.

[Brief explanation of the drawing]

1 is a perspective view showing the structure of an embodiment of the present invention, FIG. 2 is a perspective view showing the structure of the retainer 32, FIG. 3 is a sectional view showing the mounting structure of the pinion gear 54, and FIG. 4 is the top A perspective view showing an example of the configuration of the linear pulse motor according to the invention, FIG. 5 shows the retainer 2 in the linear pulse motor of FIG.
FIG. 1 is a diagram showing the structure of a part of FIG. 30...Mover, 30a...Both parts, 3
1... Stator, 32... Retainer (holding member), 33... Gear plate, 34, 35, 44
, 45...Rack gear, 37.38...
- Mover guide member, 47, 48... Roller (rolling element), 49, 50... Ball (rolling element), 5
1, 52...Ball holding member, 53...
- Base, 53a... shaft, 54... pinion gear.

Claims (1)

[Claims] In the linear pulse motor, the linear pulse motor includes a moving element, a fixed element, a rolling element interposed between the moving element and the stator, and a holding member that holds the rolling element, wherein the stator of the moving element A first rack gear is formed on a surface facing the stator, a second rack gear is formed on a surface of the stator facing the first rack gear, and pinion gears are provided that mesh with the first and second rack gears, respectively. , a slider guide mechanism for a linear pulse motor, the pinion gear being rotatably attached to the holding member;