JPS6214366A - Device for driving magnetic disk - Google Patents

Abstract

PURPOSE:To aim at the simplification of structure and the stabilization of performance by suspending a collet axis with providing a mounting hole to support a collet at the tip part of a leaf spring, using commonly the guide of a cone spring and the guide for the position regulation of the leaf spring and piercing the guide through the guide hole of the leaf spring. CONSTITUTION:With inserting a disk 4 from a front panel and rotating a lever shaft 13 by a lever, a collet cam 14 outsert-formed to the lever shaft 13 is also rotated and a collet 9 provided at the tip part of a leaf spring 15 is shifted to a lower direction and is fitted in to the positioning hole 8 of the disk 4 and is chucked between a hub 10. Adversely, when chucking is released, the lever shaft 13 is rotated in the reverse direction. As a result, the leaf spring is jumped up. The leaf spring 15 and the collet 9 are held in a releasing state with the pressure of a cone spring 16 located between the leaf spring 15 and a mounting plate 17. Therefore, decentering on a regulated track is eliminate and reliability is improved, enabling to read out data exactly.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a magnetic disk drive device, and in particular to a chucking mechanism for centering and fixing a magnetic disk between a hub and a collet provided at the tip of a drive motor. It is about improvement.

[Background of the invention]

Generally, a magnetic disk drive (hereinafter referred to as r FDD J
), a jacket containing a magnetic disk (hereinafter simply referred to as "disk") is inserted into the device, and when the operating lever is turned after insertion, a collet that is linked via this lever and a leaf spring is attached to the tip of the drive motor. The disc is centered between the provided hub and chucked. At the same time, the lower magnetic head and the upper magnetic head come into contact with the disk to read or write data on the disk.

FIG. 4 is a diagram showing the chucking mechanism part of a conventional FDD. In FIG. 0, 9 is a collet, and the hub 10 is
Center the disc between the two and chuck it. The collet 9 is supported by the leaf spring 15 via the collet shaft 27. The collet shaft 27 is formed hollow, and a guide shaft 30 for guiding the vertical movement of the collet 9 is inserted into the hollow portion. The guide shaft 30 has an apex 32 fixed to a plate 31 raised from the chassis 1.

If there is a guide shaft 30 when the collet 9 moves up and down in conjunction with the leaf spring 15 as in the conventional structure shown in FIG. 4, the chucking accuracy of the collet 9 will depend on the guide shaft 30. It turns out.

That is, when assembling the guide shaft 30, the collet shaft 2 of the collet 9
If the collet 9 is assembled while being in contact with one side of the collet 7, as shown in FIG.
The outside of the hub 10 and the inside of the hub 10 do not come into close contact evenly, leaving a gap on one side.

Also, the advantage of FDD is that it is compatible,
As mentioned above, if eccentricity occurs during chucking, other F
This also means that data recorded concentrically on a DD cannot be read out correctly, and compatibility cannot be guaranteed.

Furthermore, if the collet 9 and the hub 1o are eccentrically chucked due to the influence of the guide shaft 30, there will be a difference in the rotational speed of the hub 10 at the tip of the drive motor and the collet 9, causing a so-called harmonic phenomenon, and the disc Another drawback was that the magnetic layer at the chucking part of the device peeled off.

[Purpose of the invention]

An object of the present invention is to eliminate the drawbacks of the prior art described above, and specifically, to provide an FDD that does not use a guide shaft, has a simplified structure, and has stabilized performance.

A mounting hole with a diameter larger than the collet shaft to support the collet is provided, and the collet shaft is suspended there, and the conical spring guide for returning the leaf spring upward also serves as a guide for regulating the position of the leaf spring. However, it was passed through the guide hole of the leaf spring.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. These figures are longitudinal sectional views of mechanical parts related to chucking of an FDD according to the present invention. In the figure,
1 is a chassis to which each component of the device is attached. 2
is a boss integrally formed with the chassis 1, and a housing of a drive motor 5 for rotating the disk 4 inside the jacket 3 is fitted into the inner diameter side of the boss.

At the tip of the shaft 7, which is directly connected to the drive motor 5, there is a disk 4.
A hub 10 is provided for chucking a collet 9 between a positioning hole 8 provided at the center of the collet 9.

The collet 9 is interlocked with a temporary spring 15 that is pushed downward by a collet cam 14 provided on a lever shaft 13 by rotation of a lever attached to the front surface of a front panel (not shown).

It is designed to move up and down. When the collet 9 is in a chucked state in which the disk 4 is centered and fixed, a moderate amount of pressure is applied by the elasticity of the leaf spring 15, and the disk 4 is held by friction when the drive motor 5 rotates.

16 is a conical spring which pushes up the leaf spring 15 when the lever 12 is opened.

This spring 16 is positioned by a guide 18 that is outsert-molded on the mounting plate 17. The guide 18 is formed so as to also pass through a guide hole 19 provided in the leaf spring 15.

In the present invention, the guide shaft 30 used to guide the vertical movement of the collet 9 in the conventional device is abolished, and the collet shaft 27 is
E from the top of the mounting hole 28 formed at the tip of the leaf spring 15
It is lifted by a ring 29. To prevent the leaf spring 15 from falling due to its posture when moving up and down, and to guide its positioning,
Conical spring 16 for pushing up the leaf spring 15
It also serves as the guide 18.

In this embodiment configured as described above, when the disk 4 is inserted from the front panel (not shown) and the lever shaft 13 is rotated by the lever, the collet cam 14 formed as an outsert on the lever shaft 13 also rotates, and the leaf spring 15 is rotated. Move the collet 9 provided at the tip of the
It fits into the positioning hole 8 of the disk 4 and is chucked with the hub 10. Conversely, to release the chucking, turn the lever shaft 13 in the opposite direction, and as a result, the leaf spring 15 springs up. The leaf spring 15 and the collet 9 are maintained in the open state by the compression of the conical spring 16 between the leaf spring 15 and the mounting plate 17.

In this embodiment, unlike the conventional structure, there is no guide shaft 30 for moving the collet 9 up and down, and the collet shaft 27 is suspended by an E-ring 29 from the top of a mounting hole 28 provided at the tip of the leaf spring 15. Only. Therefore, when the collet cam 14 rotates due to the rotation of the lever shaft 13 and pushes down the collet 9 via the leaf spring 15, the positioning hole 8 of the disk 4 is initially roughly aligned as shown in FIG. . If you push down further, collet shaft 2
7 can be moved along the margin of the diameter of the mounting hole 28 of the leaf spring 15 by the necessary dimension to align with the center of the hub 10, so the positioning hole 8 and collet 9 can be accurately aligned,
Chucking is completed.

In addition, when the leaf spring 15 moves up and down, tilting and positioning errors due to the posture of the device are regulated by the guide 18 of the conical spring 16 for pushing the leaf spring 15 upward, and do not occur.

〔Effect of the invention〕

(7)- According to the present invention, the collet 9, the positioning hole 8, the hub 10
Since accurate centering chucking is performed, there is no eccentricity in the specified track when reading and writing data between different devices, and accurate data reading is possible, improving reliability.

You can also delete the guide shaft and its related parts.

Since there is no need to swage the guide shaft or tighten the screws, the product can be made at a lower cost. The conical spring guide can also be used for positioning when the leaf spring moves up and down, and even if the guide shaft is abolished, no new additional parts are required to replace it.

[Brief explanation of drawings]

1 and 2 are longitudinal sectional views of the chucking-related mechanism portion of the magnetic disk drive according to the present invention, 3(A) shows the state in the middle of chucking, and 3(B) shows the chucking-related mechanism. FIG. 4, which shows the completed state, is a diagram showing the conventional chucking mechanism. 4...Magnetic disk, 5...Drive motor, 8.
...Positioning hole, 9...Collet, 10...Hub,
13... Shikoku 8) Bar shaft, 14... Collet cam, 15... Leaf spring, 16... Conical spring, 18... Guide, 19...
...Guide hole, 27...Collet shaft, 28...Mounting hole, 29...E ring.

Claims (1)

[Claims] 1. In a magnetic disk drive device equipped with a mechanism for chucking a magnetic disk between a collet that moves up and down as the lever shaft of the operating lever rotates and a hub at the end of the drive motor, a leaf spring moves up and down in conjunction with the lever shaft. A collet shaft with a mounting hole larger than the diameter of the collet shaft that supports the collet is provided at the tip of the collet shaft, and the conical spring guide for pushing the leaf spring upward also serves as a position regulating guide for the leaf spring. A magnetic disk drive device characterized in that the plate spring has a guide hole penetrated therein.