JPH01151085A - Magnetic head positioning mechanism - Google Patents

Abstract

PURPOSE:To attain the highly accurate and high speed positioning of a magnetic head by housing a supporting body to the receiving part of a conical shape, holding this with a supporting body holder and removing a clearance of the central shaft and a bearing. CONSTITUTION:A conical shape receiving part 14 is hollowed and formed from the edge surface to the edge part of a central shaft 3 to away and support an arm group 1 to mount plural magnetic heads 7. A supporting body holder 13 to form plural notches 11 at a wall part 15 of the circumference along a shaft direction, to divide the wall part 15 in a circular circumference direction, to house a supporting body 12 to expand the wall part to the conical shape receiving part 14 and to hold the supporting body 12 into the receiving part 14 on the supporting body 12 is provided. Thus, a constant rigidity is maintained for the impact and a highly accurate and high speed positioning can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head positioning mechanism, and more particularly to a magnetic head positioning mechanism that applies pressure to a bearing in the radial direction.

[Prior Art] Conventionally, this type of magnetic disk device performs magnetic recording on a magnetic disk rotating at high speed using a magnetic head that flies at minute intervals. Therefore, as the performance of magnetic disk drives increases, it has become necessary to suppress minute vibrations and increase their rigidity.

FIG. 3 shows a general example of a magnetic disk device. The magnetic helad 7 is connected to the bearing 2 by a coil assembly 8 and a magnetic circuit 9.
It is supported so as to be able to swing freely around the central axis 3 via.

Here, since the inner ring of the bearing 2 inevitably has a slight gap with respect to the center shaft 3, if left as it is, looseness will occur between the inner ring of the bearing 2 and the center shaft 3, and the magnetic force will be reduced. 7, the positioning accuracy deteriorates.

Therefore, conventionally, as shown in FIG. 3, a hole 6 perpendicular to the center shaft 3 is provided at a height position corresponding to the bearing 2 of the center shaft 3, and the coil spring 4 and the block body 5 are housed in the hole 6. The block body 5 is radially biased against the inner ring of the bearing 2 to apply a radial load, and the reaction force presses the center shaft 3 and the inner ring of the bearing 2 to eliminate rattling due to the gap. The above positioning accuracy was addressed.

[Problems to be Solved by the Invention] However, in the conventional magnetic head positioning mechanism described above, there is a gap between the center shaft 3 and the inner ring of the bearing 2, and the coil spring 4 is located in the hole 6 at the center @3. Since the frame body 5 is housed, when the arm group 1 is repeatedly positioned or when the coil assembly 8 etc. receives a shock, the coil spring 4 can absorb the shaking if the force is small. However, when a force greater than the stiffness is applied, the bearing 2 and the center @3 come into direct contact and absorb the impact 7 in a different manner from the above. Furthermore, even when a force is applied from a direction that the top body 5 is not pushing, the impact is absorbed in a different way. Therefore, when this part vibrates, the stiffness of the side that absorbs the stiffness varies depending on the magnitude of the impact, resulting in discontinuous vibrations and the amount of deformation depending on the direction of vibration, making it difficult to position with high precision. It had the disadvantage of having a negative impact on

[Means for Solving the Problems] The magnetic head positioning mechanism of the present invention has been made in view of the above problems, and includes a central axis for swingingly supporting a group of arms on which a plurality of magnetic heads are mounted, and In a magnetic head positioning mechanism consisting of a dowel bearing provided between the end of the shaft and the group of arms, a conical receiving part is formed at the end of the central shaft in nf by hollowing out the end, and the surrounding area is A plurality of cuts are formed in the wall along the axial direction to divide the wall in the circumferential direction, and a support body is housed in the conical receiving part to spread out the wall, By providing a support presser on the support body to press the support body into the support part,
It maintains a constant rigidity against impact and can achieve high-accuracy and high-speed positioning.

[Example] Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a longitudinal cross-sectional view of one embodiment of the present invention.

In each of the above figures, 1 is an arm group on which a plurality of &f1 heads are mounted, 2 is a bearing, and 3 is a central shaft.

The central shaft 3 swingably supports the arm group 1, and a bearing 2 is interposed between the end of the central shaft 3 and the arm group 1.

A conical receiving portion (hereinafter referred to as a conical receiving portion) 14 is formed at the end of the central shaft 3 by hollowing out the end surface thereof.

Then, a plurality of cuts 11 are formed in the wall 15 around the conical receiving part 14 along the axial direction of the wall 15.
5 is divided into eight in the circumferential direction. Note that the number of notches 11 can be set arbitrarily.

Reference numeral 12 denotes a spherical support body, which is housed within the conical receiving portion 14. In addition, 13 is a support holder, and the disc-shaped base 13
A bottle body 13b is made to protrude perpendicularly from the center of the pin body 13b, and the pin body 13b is inserted into the conical receiving part 14 from above the supporting body 12, and the supporting body 12 is pressed deeply into the conical receiving part 14 with its tip. be.

When the support body 12 is pressed from above by the support presser 13 as described above, the wall portion 15 is expanded due to the wedge effect, filling the gap between the bearing 2 and the center @3 and causing rattling. Eliminate.

In the magnetic head positioning mechanism having such a structure, when the arm group 1 is repeatedly positioned or when the coil assembly 8 etc. receives an impact and force is applied between the center shaft 3 and the bearing 2, the center shaft Extremely high rigidity can be obtained in all directions.

[Effects of the Invention] As explained above, the present invention forms a conical receiving part on the central axis, divides the surrounding wall part in the circumferential direction, and attaches a support to this conical receiving part. By holding it down with a support press and pushing out the wall around the receiving part to remove the gap between the center shaft and the bearing, high rigidity is created between the center shaft and the bearing in the entire circumferential direction. This has the effect of enabling high-accuracy and high-speed positioning of the magnetic head.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing an embodiment of the invention, and FIG. 3 is a longitudinal sectional view of a conventional magnetic head positioning mechanism. 1: Arm group 2: Bearing 3: Center @ 7: @ Air head 8: Coil assembly 9: 1 Ifi air circuit 11: Notch 12:
Support body 13: Support body presser 14: Conical receiving part 15: Wall part

Claims (1)

[Claims] In a magnetic head positioning mechanism comprising a central shaft that swingably supports an arm group on which a plurality of magnetic heads are mounted, and a bearing provided between an end of the central shaft and the arm group, the end of the central shaft A conical receiving part is cut out from the end face of the conical receiving part, and a plurality of cuts are formed in the surrounding wall part along the axial direction to divide the wall part in the circumferential direction. A magnetic head positioning mechanism characterized in that a support body for pushing the wall part apart is housed in a receiving part, and a support presser for pressing the support body into the receiving part is provided on the support body.