JPS59203271A - Head positioning mechanism of magnetic disc device - Google Patents

Abstract

PURPOSE:To reduce the number of parts and facilitate the assembling work by fixing a pivot shaft onto a base and fitting a swing arm rotatably to this shaft through a bearing. CONSTITUTION:A head 1 for information write/read, a swing arm 2 which supports this head 1, and a pivot shaft 3 are provided, and this pivot shaft 3 is fixed to a base 6. The inside wheel of a bearing 7 is fitted and fixed to the pivot shaft 3, and the outside wheel of the bearing 7 is fitted and stuck to the swing arm 2. Consequently, the swing arm 2 can be rotated smoothly in the direction of an arrow B with the pivot shaft 3 as the center. A pre-load is applied to the bearing 7 from above by the spring pressure of a spring 9 for the purpose of eliminating ''play'' in the thrust direction to stabilize the rotation of the swing arm 2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a head positioning mechanism for positioning a head for writing/reading information in a magnetic disk device to an arbitrary position.

[Background of the invention]

A conventional swing type head positioning mechanism is shown in FIG.

The magnetic head 1 is attached to a swing arm 2, and the swing arm 2 is fixed to a pivot shirt 1-3.

Bearings 7 are provided on the upper and lower sides of the pivot shaft 3, allowing the pivot shaft 3 to rotate. Thrust bearings 8 are provided at the upper and lower ends of the pivot shaft 3, respectively, and a thrust load is applied to the bearings by a spring 9 via the thrust bearing 8 at the upper end to prevent "backlash" in the thrust direction of the bearing 7. It is being removed. Further, the bearing 7 is held by a block 10, and the lower block 10 is fixed to the base 6, thereby maintaining the upright stability of the pivot shaft 3.

With this configuration, when current flows through the voice coil 5 and drives the voice coil motor 4, the coil 5 rotates in accordance with Fleming's left hand rule in conjunction with the drive, and the pivot shaft connected to the coil 5 rotates. 3 rotates, and the magnetic head 1 is rotated and positioned in a direction perpendicular to the plane of the paper.

However, head 1. Swing arm 2. Pivot 1-Shaft 3. Since parts such as the block 10 were assembled into a magnetic disk drive as one swing arm assembly, the number of parts was large, making assembly work difficult and expensive. Furthermore, block 10 etc. are viewed from left and right,
Slice bearing 8. It is necessary to assemble the spring 9 and the like from above and below, which further deteriorates the workability during assembly.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a head positioning mechanism for a magnetic disk device that improves the drawbacks of the prior art as described above, has good workability during assembly, and is inexpensive.

[Summary of the invention]

To achieve the above object, the present invention provides a swing arm that is equipped with a swing arm to which a head is attached, a pivot shaft that holds the swing arm, and is mounted on a base that is flush with a spindle that holds a magnetic disk. In the type head positioning mechanism, the pivot shaft is fixed on the base, and the swing arm is rotatably fitted to the pivot shaft via a bearing.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a plan view of a head positioning mechanism according to an embodiment of the present invention, and FIG. 3 is a sectional view taken along the line A--A in FIG.

In the figure, reference numeral 1 indicates a swing arm for writing/reading information, and a swing arm 3 supports a head 1. The pivot shaft 1-shaft 1-3 is fixed to a base 6. The inner ring of the bearing 7 is fitted and fixed to the pivot shaft 3, and the outer ring is fitted and fixed to the swing arm 2, respectively. Therefore, the swing arm 2 can smoothly rotate in the direction of arrow B around the pivot shaft 3.

In order to eliminate so-called "backlash" in the thrust direction and stabilize the rotation of the swing arm 2, a preload is applied to the bearing 7 from above. That is, a spring 9 is provided between the sliced bearing 8 disposed at the upper end of the bearing 7 and the washer 11 fixed to the upper end of the pivot shirt 1-3, and the spring pressure of the spring 9 is used to apply preload to the bearing 7. I'm putting it on.

The swing arm 2 is linked to the voice coil motor 4, so when current flows through the voice coil 5 and the voice coil motor 4 is driven, the swing arm 2 rotates around the pivot shaft 3, making it possible to position the head.

In the conventional example shown in FIG. 1, head positioning was performed by rotating the pivot shirt 1-3, but in this embodiment, the pivot shirt 1-3 is fixed and the pivot (-shaft 3 and swing arm 2) The head positioning is performed by connecting the two with a bearing and rotating the swing arm 2. By adopting a structure in which the pivot shirt l-3 is fixed in this way, the number of parts can be reduced.

Further, the assembly work can be performed only from the top and bottom directions, instead of from the top and bottom and left and right directions as in the conventional case. That is, first, the pivot shaft 3 is fixed to the base 6, and then the head 1. The assembly including the swing arm 2° bearing 7 is inserted into the pivot shaft 3 from above and below, and then the thrust bearing 8. Spring 9.
The preload system consisting of the washer 11 may be set from above.

In this way, since assembly can be performed from one direction, work efficiency is improved. Furthermore, since the number of parts is small and workability is good, the failure rate is reduced and a highly reliable head positioning mechanism can be realized.

FIG. 4 shows another embodiment of the invention. The structure of the bearing 7 is different between this embodiment and the above embodiment. That is, the bearing 7 is divided into two parts, an upper bearing 7A and a lower bearing 7B, and the distance between the two bearings is maintained by a ring-shaped member 12.

In this way, when the bearing 7 is divided into two parts, the swing arm 2 has an upper bearing 7A and a lower bearing 7A.
Since there are two supporting points, vertical vibration of the swing arm 2 can be reduced.

〔Effect of the invention〕

As explained above, according to the present invention, by fixing the pivot shaft type and rotatably coupling the pivot shaft and the swing arm with a bearing, the number of parts can be reduced, and assembly from one direction is possible. Therefore, it is possible to realize a spatula positioning mechanism for a magnetic disk device that has good workability during assembly and is inexpensive.

[Brief explanation of the drawing]

FIG. 1 is a side view of a conventional head positioning mechanism, FIG. 2 is a plan view of an embodiment of the present invention, and FIG. 3 is a side view of a conventional head positioning mechanism.
A sectional view and FIG. 4 are diagrams showing another embodiment of the present invention. 2: Swing arm, 3: To pivot shirt 1, 7: Bearing, 8 Ni-last bearing, 9: Figure 1 Figure 2 Figure 4

Claims (1)

[Claims] (1) A swing-type head positioning mechanism that is equipped with a swing arm to which a head is attached and a pivot shaft that holds the swing arm, and that is mounted on a base that is flush with a spindle that holds a magnetic disk. A head positioning mechanism for a magnetic disk drive, characterized in that a pivot shaft is fixed on the base, and the swing arm is rotatably fitted onto the pivot shaft via a bearing.