JPS6215901Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support structure for a carriage used in a magnetic disk device.

Recently, as the recording density of this type of magnetic disk device has increased, the track width has also become narrower and narrower. There is a need for a device that allows for highly accurate positioning. However, as shown in Fig. 3, the conventional carriage 1 is supported only in the lower half of the carriage by bearings 2, 2', 3, 3', etc., and therefore tends to vibrate in the directions of arrows A and B. , and the frictional force generated between the bearings 2, 2', 3, 3' and the rail 15 as it moves acts on the carriage as one rotational moment, resulting in arrows C and D.
Directional vibration was also a problem. In addition, in order to solve these problems, there is a proposal to support the carriage 1 from above and below, as shown by the imaginary lines in the figure. etc., which resulted in the disadvantage of increasing the size and weight of the device.

Therefore, the present applicant made the drive center axis of the voice coil coincide with the gravity center axis of the carriage, and provided rails on both sides of the carriage so that the center axis of the rails coincided with the height position of the gravity center axis. ,
Furthermore, we have previously proposed a support structure for a carriage that eliminates the above-mentioned drawbacks by providing a bearing in the carriage so that it can roll freely and symmetrically engage with the rail from above and below.

The present applicant's support structure for the carriage is the first
This will be explained using FIG.

As shown in FIGS. 1 and 2, the carriage 1 has a voice coil 7 having a drive center axis 7a coinciding with the center of gravity axis 1a. A plurality of arms 9 on which magnetic heads are mounted are fixedly mounted. Furthermore, a support portion 1b is provided protrudingly on the left side of the carriage 1 in FIG. 11' is rotatably supported. Further, on the opposite side of the support part 1b, a leaf spring 12 having a support part 12a protruding from the center part is supported with both ends fixed to the carriage 1.
A pair of bearings 13 and 13' provided symmetrically in the vertical direction are rotatably supported on the support portion 12a. On the other hand, the base 5 has cylindrical rails 15 and 16 having the same diameter, and the center of gravity axis 1
The center axes 15a and 16a are arranged parallel to and symmetrically with respect to a, and the center axes 15a and 16a are arranged at the same height as the center axis 1a. Bearings 10, 10' and 11, 11' are mounted on the rail 15, and bearings 13, 13' are mounted on the rail 16, and the rails 15, 16 are sandwiched between the rails 15, 16 from above and below, and the bearings 10, 10' and 11, 11' are arranged in the direction of arrows E and F.
They are engaged to be able to roll freely in the direction.

With the above configuration, the carriage 1
is driven to move in the directions of arrows E and F by the voice coil 7. At this time, since the drive center axis 7a of the voice coil 6 and the center of gravity axis 1a of the carriage 1 are aligned, the drive force of the coil 6 is applied to the carriage 1. No harmful rotational moments are generated. Also, the movement of carriage 1 is done by bearing 1.
This is done by rolling the bearings 10, 10', 11, 11' and 13, 13' on the rails 15, 16.
3 and 13' are engaged with each rail 15 and 16 in a symmetrical manner from above and below, and the leaf spring 12 constantly presses the bearings 13 and 13' in the direction of the rail 16 by its elastic force. , the bearings 10, 10', 11, 11', 13, 13' and the rails 15, 16 are firmly engaged, and the carriage 1 is reliably supported. Furthermore, the influence of the rotational moment due to the frictional force generated between each bearing 10, 10', 11, 11', 13, 13' and the rails 15, 16 can be avoided by ensuring that the carriage 1 is firmly supported from both sides around the center of gravity axis 1a. Since there is, arrow A,
The rotational moment in the horizontal plane, which is the source of vibration in the direction B, is sufficiently supported, and the rotational moment in the plane perpendicular to arrows A and B, which is the source of vibration in the directions C and D, is supported by the rails 15 and 16. central axes 15, 16 of
The heights of the center axes 15a, 16a of the bearings 10, 10', 11, 1 coincide with the center of gravity axis 1a, and
1', 13, 13' are arranged symmetrically in the vertical direction with respect to the rails 15, 16, so that no harmful vibrations occur in the carriage 1.

In this way, the carriage structure previously proposed by the applicant can reliably support the carriage against the base, sufficiently prevent harmful vibrations caused by rotational moment, and enable highly accurate positioning. becomes.

However, as can be seen from FIGS. 1 and 2, the above-mentioned carriage structure has a large number of parts and a plurality of configurations. Furthermore, it has the disadvantage that it not only requires many assembly steps but also is expensive.

The present invention has been devised in view of the above-mentioned drawbacks, and its purpose is to realize a carriage structure that has a small number of parts, is therefore inexpensive, and is easy to assemble. Another object of the present invention is to realize a carriage structure with excellent quick response and low power consumption.

The object of the present invention is to provide a disk information magnetic medium, a rotational drive source for rotating the magnetic medium, a magnetic head for reading and writing information to and from the magnetic medium, and a head arm for supporting the magnetic head. A magnetic disk device comprising: a carriage to which the head arm is attached and moves on a slide rail by the driving force of a motor to move the magnetic head along the radial direction of the magnetic medium; It consists of two rails arranged in parallel at a predetermined interval in the horizontal direction on a line extending in the radial direction of the magnetic medium, one of which is fixed to the base by a holding member, and the other is regulated in the vertical direction by the holding member. A magnetic disk device characterized in that the carriage is supported by a cylindrical ball bearing having a plurality of steel balls on its inner wall, into which the slide rail is fitted, and the carriage has a gap so as to be movable in the left and right directions. This can be achieved by using a carriage structure.

The present invention will be explained below with reference to the drawings. 4 to 6 are a top view, a front view, and a side view for explaining the carriage structure according to the present invention.

In the figure, 21 is a carriage, 22 is a stepping motor, 23 is a pulley attached to the rotating shaft of the stepping motor 22, and 24 is a flexible belt composed of a leaf spring, etc., and the center end thereof is attached to the pulley 23. It is wound around and fixed with screws, and both ends of the carriage 21 are connected to both ends 21 of the carriage 21.
a, 21b. Further, 25 and 26 are slide rails for guiding the carriage 21, and 27 and 28 are balls formed by inserting the slide rails 25 and 26 and arranging a large number of steel balls on the inner wall thereof in a field provided along the axial direction. Bearing bearing, 29 is screwed to the base at the center, and a holding member for fixing the slide rail at both ends;
30 is a damper attached to the rotating shaft of the stepping motor.

This embodiment shows a case where a stepping motor 22 is used as the drive source for the carriage 21. The operation is performed as follows. By driving the stepping motor 22, the pulley 23 is rotated by a predetermined rotation angle, the belt 24 connected to the pulley is wound around, and the carriage 21 connected to the belt 24 is moved along the slide rails 25, 26.

The carriage 21 has two linear ball bearings 27 and 28, as shown in FIG.
It moves in a straight line while being guided by the slide rails 25 and 26 of the book. The bearings 27, 28 have a large number of steel balls arranged in the axial direction on the inner walls in contact with the cylindrical outer peripheral surfaces of the slide rails 25, 26,
A carriage 21 guided by slide rails 25 and 26 is smoothly slid. As shown in FIG. 6, the slide rail 25 is pressed and fixed to the base by a presser member 29.
6 is configured to be movable in the left-right direction with a slight gap in the left-right direction while being restricted in the vertical direction by the presser member 29.

Therefore, it is possible to cope with the parallelism of the slide rails 25 and 26 and thermal expansion caused by temperature changes in the carriage and the like.

As can be seen from the drawings, in this invention the movement of the carriage 21 is effected by the linear ball bearings 27, 28 and the slide rails 25, 26, so that an easy to assemble and inexpensive carriage structure can be realized.

In addition, compared to the structure shown in Figures 1 and 2, only two bearings are connected to the carriage 21 side, so the weight of the carriage itself, which is a moving part, is lighter and the responsiveness is higher. Moreover, it is possible to realize a carriage structure that operates with low power consumption. In addition, since ball bearings are used as bearings, there is little wear and tear over time, and the coefficient of friction is extremely small, allowing for smooth driving.

As explained above, according to the present invention, it is possible to obtain a carriage structure that has a small number of parts, is easy to assemble, and is inexpensive. Furthermore, since the movable part can be configured compactly, the load on the motor is reduced, responsiveness can be significantly improved, and power consumption can be kept low.

Furthermore, in the present invention, two parallel slide rails are used to guide the carriage, but one slide rail is fixed to the base and serves as the guide reference for the carriage, and the other slide rail is movable. Even if the parallelism is mechanically out of alignment, it can be corrected without putting a burden on the motor, and it is also possible to cope with thermal expansion.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of a carriage support structure, FIG. 2 is a side view of FIG. 1, and FIG. 3 is a side view of a conventional carriage support structure.
4 to 6 show a top view, a front view, and a side view, respectively, of a carriage structure according to the present invention. In the figure, 21 is a carriage, 22 is a stepping motor, 23 is a pulley, 24 is a belt, 2
5 and 26 are slide rails, and 27 and 28 are ball bearings.

Claims (1)

[Claims for Utility Model Registration] A disk information magnetic medium, a rotational drive source for rotating the magnetic medium, a magnetic head for reading and writing information to and from the magnetic medium, and a head arm for supporting the magnetic head. and a carriage to which the head arm is attached and moves on a slide rail by the driving force of a motor to move the magnetic head along the radial direction of the magnetic medium, wherein the slide rail is , consisting of two rails arranged in parallel at a predetermined interval in the horizontal direction on a line extending in the radial direction of the magnetic medium, one of which is fixed to the base by a holding member, and the other rail is fixed to the base by a holding member, and the other is fixed to the base in the vertical direction by the holding member. the carriage is regulated but has a gap that allows movement in the left and right directions, and the carriage is supported by a cylindrical ball bearing having a plurality of steel balls on its inner wall into which the slide rail is fitted. Carriage structure of magnetic disk device.