JPH02218077A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To enhance reliability by arranging only a pipe actuator for loading and unloading on the movable part of a head positioning actuator and separately arranging a power source for the pipe actuator on the fixed part thereof. CONSTITUTION:When a magnetic head 3 exists at an information readout position, a magnetic head arm 2 separates from a bellows 8, so that the pressure of the bellows 8 becomes low. Therefore, a soft tube 7 is contracted as illustrated in (b) figure and a magnetic head supporting spring 4 is in a free state. When the head 3 reaches a retreating area from such a state as illustrated in (c) figure, the arm 2 presses the belows 8 and internal pressure is made high. Since the tube 7 expands, an illustrated in (d) figure, to press the spring 4, the head 3 becomes in an unloaded state that it separates from the surface of the magnetic disk. Thus, the magnetic head can be loaded and unloaded without external power.

Description

[Detailed Description of the Invention] [Summary] Concerning a magnetic disk device used as an external storage device for computers, etc., and particularly a mechanism for loading and unloading its magnetic head, the present invention provides a simple mechanism for loading and unloading a floating magnetic head. , and a magnetic head arm driven by an actuator, with the purpose of performing the operation without requiring power.
In a magnetic disk drive comprising at least a magnetic head support spring supported by the arm and having a magnetic head at its tip, a magnetic head support spring is lifted up by expansion at a connection portion between the magnetic head support spring and the magnetic head arm. An expandable and deflated soft tube is provided to unload the magnetic head from the magnetic disk surface and to load the magnetic head by contraction, and a bellows is provided which is compressed by the magnetic head arm when the magnetic head reaches the start/stop area of the magnetic disk. The bellows and the soft tube are connected by a pipe, and the inside thereof is filled with a fluid.

[Industrial application field]

The present invention relates to a magnetic disk device used as an external storage device for computers, etc., and particularly to a magnetic disk device for loading the magnetic head,
Regarding the unloading mechanism.

In magnetic disk drives that use floating magnetic heads, the magnetic head may come into contact with the magnetic disk when the magnetic disk starts or stops rotating, resulting in wear, or the magnetic head may stick to the magnetic disk during long periods of rest, reducing reliability. There is a need for an effective loading/unloading mechanism for the magnetic head in order to prevent the magnetic head from degrading.

[Conventional technology]

FIG. 3 is a diagram showing an example of a conventional magnetic head loading/unloading mechanism (Reference: Japanese Patent Application Laid-Open No. 58-2036
Publication No. 78). In the figure, reference numeral 24 denotes a moving table, which supports the magnetic helad 21 via a leaf spring 22 and an arm 23. The loading/unloading mechanism is supported by a fulcrum 29 on a moving table 24, and includes an L-shaped lever 25 with a thin plate 26 attached to one end, and an air cylinder 2 that drives the lever.
7. In the illustrated state, the thin plate 26 pushes down the leaf spring 22, putting the magnetic head in an unloaded state. From this state, move the moving table 24 to move the magnetic head 21 to a desired position on the magnetic disk 34, and move the air cylinder 27 to the arrow 31.
By rotating the lever 25, the thin plate 26 moves in the direction of the arrow 30, releasing the pressure of the leaf spring 22 and loading the magnetic head.

[Problem to be solved by the invention]

The conventional load/unload mechanism described above has a complicated structure, the positioning actuator is heavy, the access speed to target data is slow, and the throughput of the device is reduced. Further, there is a problem in that it requires power from an air cylinder or a solenoid, and furthermore, reliability is lowered due to resonance of the air cylinder or solenoid.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, it is an object of the present invention to provide a magnetic disk device that can load and unload a flying magnetic head with a simple mechanism and without requiring power.

[Means to solve the problem]

In order to achieve the above object, the magnetic disk drive of the present invention includes a magnetic head arm 2 driven by an actuator 1, and a magnetic head support spring 4 supported by the arm 2 and having a magnetic head 3 at its tip. Wipe at least a magnetic disk drive equipped with the above-mentioned magnetic head support spring 4 at the connection portion between the magnetic head support spring 4 and the magnetic head arm 2, and lift the magnetic head support spring 4 by expansion to unload the magnetic head 3 from the magnetic disk surface. A soft tube 7 that can be expanded and contracted to be loaded by contraction is provided, and a bellows 8 that is compressed by the magnetic head arm 2 when the magnetic head 3 comes to the start/stop area of the magnetic disk is provided, and the bellows 8 and the soft tube are 7 is connected by a pipe 10, and the inside is filled with fluid.

[For production]

The fluid pushed out from the bellows 8 pressed by the magnetic head arm 2 expands the soft tube 7 provided at the connection between the magnetic head arm 2 and the magnetic head support spring 4, lifting the magnetic head support spring and lifting the magnetic head support spring 3. The head arm 2 releases the pressure on the bellows 8, contracts the soft tube 7, releases the pressure on the magnetic head support spring 4, and loads the magnetic head 3. In this case, since there is no drive source such as an air cylinder or solenoid, there are no problems such as resonance, and no external power supply is required.

〔Example〕

FIG. 1 is a diagram showing an embodiment of the present invention.

In the figure, reference numeral 1 denotes a swing-type actuator for head positioning that rotates in the direction of arrow AA', and a plurality of magnetic head arms 2 are attached in parallel to the actuator. magnetic head 3 each
A magnetic head support spring 4 supporting the magnetic head is connected, and the magnetic head support spring 4 applies pressure to the magnetic head 3 in the direction of the data reading surface of the magnetic disk 5, which is a recording medium. Also, the magnetic head arm 2 and the magnetic head support spring 4
A presser metal fitting 6 as shown in the figure is attached to the magnetic head arm 2 at the connection part with the magnetic head arm 2, and the tip is closed between the presser metal fitting 6 and the magnetic head support spring 4, so that it can expand or contract due to changes in internal pressure. A soft tube 7 is inserted and provided. When the soft tube 7 expands, it presses the magnetic head support spring 4 and moves the magnetic head 3 at the tip in a direction away from the magnetic disk surface.

Reference numeral 8 denotes a bellows, which is disposed at a position where it is pressed by a pressing plate 9 attached to the magnetic head arm 2 when the magnetic head arm 2 comes to the retraction area (start/stop area of the magnetic head). ing. This bellows 8
and the soft tube 7 are connected by a flexible pipe 10 that is less deformed due to internal pressure, and contains a fluid (
gas or liquid).

The operation of this embodiment configured as described above will be explained with reference to FIG.

First, as shown in FIG. 2(a), when the magnetic head 3 is at the information reading position, the magnetic head arm 2 is away from the bellows 8, so the pressure inside the bellows 8 is low. Therefore, as shown in Figure (b), the soft tube 7 is contracted, and the magnetic head support spring 4 is in a free state, so that the magnetic head 3 is in a loaded state. From this state, when the magnetic head 3 comes to the retracted area as shown in Figure (C), the magnetic head arm 2 presses the bellows 8, increasing its internal pressure. Therefore, the soft tube 7 expands as shown in figure (d) and presses the magnetic head support spring 4, so that the magnetic head 3 is separated from the magnetic disk surface and enters an unloaded state.

As described above, the present embodiment has a simple configuration, and the magnetic head can be loaded and unloaded without requiring external power.

〔Effect of the invention〕

As explained above, according to the present invention, only the pipe actuator for loading and unloading is arranged on the movable part of the head positioning actuator, and the power source of the pipe actuator is arranged in the fixed part to separate the two. Because there are
The movable part can be significantly reduced in weight and simplified, and the unloading operation can be performed only when the movable part reaches the retraction area without adding any extra mechanism. Furthermore, the tube acts as a damper against vibrations, making it more resistant to vibrations. These make it possible to provide a low-cost and highly reliable magnetic disk device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a diagram for explaining the operation of the embodiment of the present invention, and FIG. 3 is a diagram showing a conventional magnetic head loading/unloading mechanism. be. In the figure, 1 is a head positioning actuator, 2 is a magnetic head arm, 3 is a magnetic head, 4 is a magnetic head support spring, 5 is a magnetic disk, 6 is a presser metal fitting, 7 is a soft tube, 8 is a bellows, 9 10 indicates a pressure plate, and 10 indicates a pipe. Embodiments of the present invention are shown in Figure 1. Loading of a conventional magnetic disk drive Aphrod I+! Figures illustrating the structure; Figures illustrating the invention in detail; Figures illustrating the invention;

Claims (1)

[Claims] 1. A magnetic head arm (2) driven by an actuator (1), and a magnetic head support spring (4) supported by the arm (2) and having a magnetic head (3) at its tip.
In the magnetic disk drive, the magnetic head support spring (4) and the magnetic head arm (2) are provided.
) is connected to the magnetic head support spring (4) due to expansion.
An expandable and contractible soft tube (7) is provided to unload the magnetic head (3) from the magnetic disk surface by lifting the magnetic head (3), and to load the magnetic head (3) by contraction.
) comes to the start/stop area of the magnetic disk, the bellows (8) is pressed by the magnetic head arm (2).
), and the bellows (8) and the soft tube (7) are provided.
) connected by a pipe (10) and filled with fluid.