JPH0140421B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oscillating head positioning mechanism that is easy to assemble and disassemble.

Conventionally, there have been magnetic head positioning mechanisms for recording tracks such as magnetic disks as shown in FIGS. 1 and 2. FIG. 1 is a front view of a conventional oscillating head positioning mechanism, and FIG. 2 is a sectional view taken along line A--A of the oscillating head positioning mechanism shown in FIG. In each of the above figures, 1 is a magnetic head, 2
3 is a rotating shaft to which the head arm 2 is screwed, 4a,
4b is the bearing of the rotating shaft 3, 5 is the housing,
6 is a linear motor coil, 7 is a permanent magnet, 8 is a magnetic disk, and 9 is a spring. In the above mechanism, the coil 6 of the linear motor is in the magnetic field created by the permanent magnet 7, and when a current is passed through the coil 6,
A driving force is generated in the direction of arrow i or i' shown in FIG. 1, thereby moving the magnetic head 1 in the direction of arrow j or j' shown in FIG. conduct. In addition, the rotation axis 3
In order to eliminate play between the bearings 4a and 4b, the inner rings of the bearings 4a and 4b are bonded to the rotating shaft 3. Also,
The outer ring of the bearing 4b and the housing 5 are also bonded together, and the outer ring of the bearing 4a and the housing 5 are also bonded together.
The outer ring of the bearing 4a is preloaded with elastic pressure in the thrust direction by the spring 9.
Further, the head arm 2 is fixed to the rotating shaft 3 using a press screw.

However, with the conventional mechanism described above, it is very difficult to remove the head arm 2 once assembled, and if the magnetic head 1 is damaged,
There was an inconvenience that the entire mechanism described above had to be replaced. Therefore, to improve this,
What is shown in FIG. 3 has been proposed. FIG. 3 is a sectional view showing another modification of the oscillating head positioning mechanism shown in FIG. 2. In the case shown in FIG. 3, the inner rings of the bearings 4a, 4b are bonded to the rotating shaft 3, but the outer rings of the bearings 4a, 4b and the housing 5 are not bonded.
Furthermore, the outer diameter of one of the bearings 4b is configured to be smaller than the diameter of the rotating shaft 3. Thereby, even after assembly, the rotating shaft 3 can be easily removed from the housing 5, and the head arm 2 can be easily replaced. However, in this case, since the outer diameter of the bearing 4b is small, its rigidity decreases, and the head arm 2
When the number of oscillating head positioning mechanisms is increased, the mechanical resonance frequency of the oscillating head positioning mechanism becomes lower.
The disadvantage was that the head positioning accuracy deteriorated.

This invention was made in order to eliminate the drawbacks of the conventional devices as described above.A head arm having a magnetic head is attached to a rotating shaft supported by bearings at both ends, and this head arm is driven by the driving force of a linear motor. In a swing type head positioning mechanism that swings around a rotating shaft, one end of the rotating shaft and the inner surface of the inner ring of the bearing are each formed into a tapered shape, thereby reducing the rigidity of the bearing. It is an object of the present invention to provide a swing type head positioning mechanism that allows the head arm to be easily replaced without any problems.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a cross-sectional view showing an oscillating head positioning mechanism which is an embodiment of the present invention. The same parts as in FIGS. Omitted. In the figure, 1
0 is a rotating shaft with one end formed into a tapered shape; 11
is a ring which is interposed between the inner ring of the bearing 4b and the rotating shaft 10 and has a tapered inner surface. Ring 11, inner ring of bearing 4b, housing 5
The outer ring of the bearing 4b, the rotary shaft 10, and the inner ring of the bearing 4a are all securely fixed by adhesive. Further, the outer ring of the bearing 4a is preloaded by elastic pressure in the thrust direction and the radial direction by a spring 9 and a spring 12, respectively. The oscillating head positioning mechanism of the present invention has the above-described structure, so that each bearing 4a, 4b, rotating shaft 10, and housing 5 are reliably attached and assembled without play, and each bearing 4a , 4b can also be used with a large outer diameter, without reducing the resonant frequency of the positioning mechanism of the oscillating head.
A swing type head positioning mechanism is constructed so that the head arm 2 can be easily replaced.

In the above embodiment, a ring 11 interposed between the inner ring of the bearing 4b and the rotating shaft 10 and having a tapered inner surface is used. However, another embodiment of the present invention shown in FIG. As shown in FIG. 1, instead of using the ring 11, the inner surface of the inner ring of the bearing 13 may be formed into a tapered shape, and the same effect as in the above embodiment can be obtained.

As described above, according to the oscillating head positioning mechanism according to the present invention, one end of the rotating shaft and the inner surface of the inner ring of the bearing are each formed into a tapered shape, which reduces the rigidity of the bearing. This has the excellent effect of making it possible to replace the head arm extremely easily and simply without causing any problems, and further improving the positioning accuracy of the swing type head.

[Brief explanation of drawings]

Fig. 1 is a front view showing a conventional swing type head positioning mechanism, Fig. 2 is a sectional view taken along the line A--A of the swing type head positioning mechanism shown in Fig. 1, and Fig. 3 is a front view of the swing type head positioning mechanism shown in Fig. 2. FIG. 4 is a sectional view showing another modification of the swing type head positioning mechanism. FIG. 4 is a cross section showing the swing type head positioning mechanism which is an embodiment of the present invention. FIG. 5 is a cross sectional view showing another modification of the swing type head positioning mechanism. FIG. 3 is a sectional view showing a swing type head positioning mechanism. In the figure, 1... Magnetic head, 2... Head arm, 3, 10... Rotating shaft, 4a, 4b, 13... Bearing, 5... Housing, 6... Coil, 7... Permanent magnet, 8... Magnetic disk, 9, 12... Spring , 11... is a ring. In addition, in the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Scope of Claims] 1. A swing type head positioning mechanism in which a head arm having a magnetic head is attached to a rotating shaft supported by bearings at both ends, and the head arm is swung around the rotating shaft by the driving force of a linear motor. A swing type head positioning mechanism, wherein one end of the rotating shaft and an inner surface of the inner ring of the bearing are each formed into a tapered shape. 2. The tapered shape formed on the inner surface of the inner ring of the bearing is formed by a ring that is interposed between the inner ring of the bearing and the rotating shaft and whose inner surface is tapered. The oscillating head positioning mechanism according to item 1.