JPS60162470A - Linear motor - Google Patents

Abstract

PURPOSE:To improve the position accuracy by providing a movable plate on the bottom of a guide groove in which a ball is provided, and pushing it by an adjusting screw to eliminate a gap between the ball between the grooves and the wall of the guide groove. CONSTITUTION:A voice coil type motor 1 is composed by forming a stator of a cylindrical yoke 2, a permanent magnet 3 and a core 4, and axially movably engaging a coil 5 to become a movable element. The coil 5 is secured through an impact absorbing damper 9 to the rear surface of a carriage 8, placed fixedly on a movable base 20, and movably engaged with an upward groove type guide frame 7. Guide grooves 10, 15 are formed on the frame 7 and the base 20, respectively, and a ball 11 is engaged through wires 12, 12', 16 for guiding. A movable plate 13 is engaged with one guide groove 10, and an adjusting screw 14 for pushing the plate is engaged with the frame 7. The plate 13 is moved by the screw 14 to eliminate a gap between the wires 12 and 12', 16, thereby reducing a fluctuation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] This IJFJ relates to a linear motor device used to drive a magnetic head of a magnetic recording/reproducing device.

[Background technology]

Conventionally, a voice coil type linear motor has been used to drive a magnetic head of a magnetic disk device.

The magnetic head is mounted on a carriage and driven, and the mechanisms shown in FIGS. 5 to 7 have been proposed as guide mechanisms for the gear ridge.

0 yen! In the example shown in Fig. J, two wires 38 and 39 (i-2 each) are provided in parallel on the carriage 36 and the fixed frame 37, and a loose ball 41 is inserted into the retainer 40 between them (!1). In the example Q of Fig. 6, a V-groove 45.46f6 is provided facing the movable rod 43 on which the carriage 42 is mounted and the fixed frame 44, and the ball 47 is sandwiched between them. 48 is a retainer. However, none of them has a means for adjusting to eliminate the gap between the balls 41 and 47 and its guide means, and it is difficult to improve the precision of the parts. As a result, the gap could not be sufficiently eliminated, causing rattling and making smooth reciprocating motion impossible.As a result, the positional accuracy of the head was poor.

FIG. 7 shows another conventional example (USPAT3838455
issue). In this example, a guide shaft 31 and a guide plate 32 are all provided, and a-lars 34 and 35 attached to a carriage 33 are brought into rolling contact. However, carriage 3
Since the guide shaft 31 passes through the lower central part of the carriage 33, there is a limit to the number of magnetic heads that can be attached to the carriage 33.
As the number increases, the height of the carriage 33 becomes higher. Unfortunately, if only the guide shaft 31 is used, it will rotate and fall sideways, so a guide plate 32 is provided for support, but this has the problem of increasing the size. Therefore, it is not suitable for devices that use 5-inch or 3.5-inch magnetic disks, as is the case these days.

[Purpose of the invention]

It is an object of the present invention to provide a near motor device 4 that can reduce carriage runout and improve positional accuracy without requiring much precision in parts, and is suitable for downsizing.

[Disclosure of the invention]

The linear motor device of the present invention has a carriage t-
A guide groove facing the side surface of the groove-shaped movable base to be mounted is provided, a ball is provided in this guide groove, a movable plate is provided on the bottom of the guide groove of the guide frame, and the movable plate is pushed with an adjustment screw to connect the ball. The gap between the guide groove and the wall surface is eliminated. The guide groove has two holes for guiding the ball.
Secure the book wire.

Embodiment An embodiment of the present invention is shown in FIGS. 1 to 4. In the figure, 1 is a voice coil type motor section, and a stator is made up of a cylindrical yoke 2, a permanent magnet 3, and an iron core 4 ((4
The city-shaped coil 5 which becomes the r5J mover is placed between the yoke 2 and the iron core 4! It is loosely fitted so that it can be moved in the C direction. The yoke 2 is fixed to an upward groove-shaped guide frame 7 via a motor mounting base 6, and the coil 5 is attached to the rear surface of the carriage 8 with a value JJ.
It is fixed via an X-absorbing damper 9. The guide frame 7 has inner -Hhr K guide grooves 10 on both flanges;
A wire 12 for guiding a bolt 110 is fixed to the surface of the ML surface of the 1+1 guide groove 10. A movable plate 13 has two wires 12' fixed to the guide groove 10 on the other side.
is inserted, and the adjustment to push out the ijJ moving plate 13 is performed.
is screwed onto the guide frame 7. 'The carriage 8 is mounted on a groove-shaped IJJ moving table 20 that is loosely resting on the guide frame 7, and is fixed with screws, etc., and a double bed of magnetic heads (not shown) is housed in the front (=J The movable table 20 has a guide eJ&15 on the outside 1hj of both flanges, which faces the guide groove 10 of the guide frame 7, and two wires 16 are fixed to the bottom of the guide frame 7. A plurality of balls 11 are inserted between the guide grooves 15 of the base 20, and the balls 11 are loosely fitted into the holes of the retainer 17.

Operation To explain the operation of the above configuration, the dotted line Xt in FIG.
In the magnetic flux direction of the permanent magnet 3, the iron core 4. Flows through yoke 2. Then, when current flows through coil 5, 7
Electromagnetic force is generated by Lemming's left hand rule. coil 5
Although the direction of magnetic flux is opposite on the upper and lower sides of , the direction of current flow is also opposite, so the force ultimately acts in the direction of the dotted line Y. This force moves the coil 5 in the Y direction, and the gear ridge 8 connected to the coil 5 also moves. And the magnetic head:
#Move.

Although it operates in this way, if there is any looseness between the movable base 20 and the guide frame 7, move the movable plate 13 with the adjustment screw 14 to adjust the distance between the ball 11 and the wires 12° 12', 16. It is possible to eliminate gaps and reduce rattling.

As a result, the carriage 8 can move smoothly on the guide frame 7 together with the HJ moving base 20, and the frictional resistance is also significantly reduced. Even in floating type magnetic heads,
The disc does not shake due to air flow as it rotates.

In this way, there is less vibration of the carriage 8, making it easier to
C Magnetism・Good positioning accuracy of the throat. In addition, since there is no problem of vibration, the element H of the carriage 8 and movable metal 20 is
< The access time of the magnetic head can be shortened. In addition, since the carriage 80 is supported only by the carriage 80 and 011j, the guide shaft 31 is provided on the F side of the carriage 3 as in the example shown in FIG. In addition, if the number of guides is small, it can be made smaller.
This arrangement is suitable for miniaturization compared to the arrangement in which the guide plate 31 and the guide plate 32 are provided. Furthermore, carriage 8 &:i movable metal 2
Since 4 is also mounted on the moving base 20, which is provided separately from 0,
The height is 4'4, and the height is 8.2.
Q'g can be treated as an independent entity up to the middle of assembly. Moreover, since it has a movable shape of 20 pieces and 6 pieces, it is easy to move the carriage H. Therefore,
Easy to manufacture.

〔Effect of the invention〕

The linear motor device of the present invention is effective if it can (a) improve gamma positioning accuracy by reducing carriage runout without requiring high component precision, and can be made smaller.

[Brief explanation of the drawing]

Figure 2'C1 is a cutaway side view of one embodiment of the present invention, Figure 2 is an explanatory diagram of the operation of the motor/control section thereof, Figure 3 is a front view of the whole thereof, and Figure 4 is a part thereof. The omitted Mfl perspective view and FIGS. 5 to 7 are cutaway front views of different conventional examples, respectively. ■... Tanabatabe, 5... Coil (iliJ Doko), 7
...Guide frame, 8. Carriage, 10.. Guide groove, 11.. Ball, 12. 12'... Wire, 13.
・・Movable plate, 14・■o1 adjustment screw, 15・Guide groove, 16・・Wire, 20 ・IJJ moving platform
,f,-,,,1 fJ3Figure 4 12

Claims (1)

[Claims] The motor part consists of a fixed 1'- and a BJ mover that moves in plane, and the front F Erf is fixed to the Ti1l Fn2 stator.
a groove-shaped kite frame extending in the moving direction of the mover and having guides W+'lf in the moving direction on the inner surfaces of both flanges, and a guide t7' that is dazzling within this guide frame and facing the guide grooves on the outer surfaces of both flanges. A groove-shaped b-clinging base having A'fc, a gear ridge mounted on this rjj-jinging base and connected to the 01J 61 mover, and a movable shaft provided on the bottom of the guide groove on one or both sides of the guide frame. The guide slot 111 is screwed onto the plate and the guide frame, and the jjJ moving plate is entirely made of sheet metal.
0, an adjustment screw to push it to 0, two wires each installed on the IjJ' moving plate and the bottom of the kite groove of the front F plate where this movable plate is not installed, and this wire. Two wires are provided on the bottom surface of each guide γVlj of the ijf moving table facing the ijf moving table, and between the wires of the kite groove of the moving table and the wires of the guides HF and H of the guide frame. A near motor device comprising a plurality of balls held in place and a retainer into which these balls are loosely fitted.