JPH0132200Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a disk clamping device for a floppy disk drive that prevents deformation and damage to the center hole forming surface of the floppy disk when the clamp is released.

[Conventional technology]

Conventional disk clamp devices for floppy disk drives include those shown in FIGS. 3 and 4.

First, the configuration will be explained based on FIGS. 3 and 4. 1 is a spindle that is directly connected to the motor shaft or is transmitted and driven by the motor, 2 is a floppy disk, and 2A is a clamp area of the floppy disk 2. , 2B indicates the center hole forming surface of the floppy disk 2, and 3 indicates a collet (clamp material) fitted to the spindle 1 via the center hole forming surface 2B of the floppy disk 2.
3A is the clamp area 2A of the floppy disk 2
3B is the floppy disk 2
4 is an alignment surface that presses against the center hole forming surface 2B to produce an alignment effect, 4 is a collet member that generates a pressing force and a pressing force on the collet 3;
A indicates the bearing, 5 is a compression coil spring disposed between the lower surface 4B of the collect member 4 and the bottom surface 3C of the collect 3, 6 is the collet guide shaft;
A and 6B indicate upper and lower retaining rings that connect the collet guide shaft 6, the collet 3, and the collet member 4.

Next, to explain the operation, the floppy disk 2 is loaded onto the spindle 1, and the collet guide shaft 6 is moved by operating a clamp lever (not shown) or the like.
is pushed down in the direction of the arrow in Figure 3. Along with this depression, the collet 3 and the collet member 4 are also depressed. In the process of pressing down the collet 3, even if the loading position of the floppy disk 2 is slightly deviated, the inclined outer surface 3D of the collet 3 is brought into center alignment while contacting the center hole forming surface 2B of the floppy disk 2. The press surface 3A of the collet 3 is the clamp area 2A of the floppy disk 2.
The collet guide shaft 6 is pressed down by the same amount as the amount that the collet guide shaft 6 is pressed down. The pressing down of the collect guide shaft 6 is as follows:
This is done even after the pressing surface 3A is completely pressed against the clamp area 2A, and the collet member 4 is further pressed down by the upper retaining ring 6A. Since the pressing surface 3A of the collet 3 is in pressure contact with the clamp area 2A,
Although it no longer decreases, as the collet member 4 is pressed down, the repulsive force caused by the compression of the compression coil spring 5 increases the pressing force on the clamp area 2A.
Furthermore, when the collet guide shaft 6 and the collet member 4 are pushed down, the inclined surface 4C of the collet member 4
begins to come into pressure contact with the inclined inner surface 3E of the collet 3. As this pressure welding progresses, the collet 3 is made of a synthetic resin that has a high degree of elasticity and is designed to have a shape, thickness, etc., such as providing slits 3F in several radial locations so that it can be easily deformed.
It expands radially outward in response to the pressing force from the collet member 4. Therefore, the alignment surface 3B of the collet 3 also expands outward, and the alignment surface 3B is similar to the center hole forming surface 2B of the floppy disk 2.
The floppy disk 2 is aligned by pressure contact with the inner wall surface 1A of the spindle 1. By pressing the alignment surface 3B against the inner wall surface 1A, the collet 3
The outward expansion operation of the floppy disk 2 is completed, and the clamping operation of the floppy disk 2 is completed.

Next, to explain how to unclamp the floppy disk 2, the collet guide shaft 6 is pulled up in the direction of the dashed arrow in FIG. 4 by releasing the clamp lever (not shown) or the like. Along with this pulling up, the collet member 4 is also pulled up, but at the beginning of this pulling up, the collet 3 remains stationary due to the repulsive force of the compression coil spring 5. As the collet member 4 is pulled up, the pressure contact between the inclined surface 4C of the collet member 4 and the inclined inner surface 3E of the collet 3 is released, and the alignment surface 3 of the collet 3 expands outward due to the pressure contact.
B returns to its original state due to the restoring force of its material, such as the synthetic resin. While the pressing force of the pressing surface 3A of the collet 3 is also reduced by the expansion of the compression coil spring 5, the lower retaining ring 6B holds the collet 3.
is pulled up, and the clamp release is completed.

[Problem that the invention attempts to solve]

This prior art is constructed and operated as described above, but in this prior art, the restoration of the alignment surface 3B of the collet 3 upon unclamping depends only on the elasticity of the collet 3 made of synthetic resin or the like. Therefore, if a creep phenomenon occurs in the collet 3 due to an increase in the temperature of the floppy disk drive or the maintenance of a clamped state for a long period of time, the alignment surface 3B of the collet 3 will not repeat itself by a predetermined amount. Therefore, in this prior art, when the clamp is released, the alignment surface 3 of the collet 3 that is in pressure contact with the center hole forming surface 2B of the floppy disk 2 is
There is a problem that B catches the center hole forming surface 2B and deforms or damages the center hole forming surface 2B.

In this prior art, the collet guide shaft 6 moves only up and down, but in other prior art, the collet guide shaft partially moves in an arc. Other conventional techniques also have similar problems to this conventional technique.

This invention was made for the purpose of solving the problems of the prior art.

[Means for solving problems]

Means for solving the above problems will be explained below using FIGS. 1 and 2, which correspond to embodiments.
In this invention, a magnetic body 14 is attached to the outer circumferential surface 4D of the collect member 4, and a magnetic body 13 having a gap G is attached to the inner circumferential surface 3G of the collect 3.

[Effect]

With this configuration, when the clamp is released,
In addition to the elastic restoring force of the collet 3, the magnetic bodies 13 and 1
Since the suction force of 4 is applied, the collet 3 is reliably restored to the required amount, and there is no pressure contact with the floppy disk 2.

〔Example〕

An embodiment of this invention will be described below with reference to FIGS. 1 and 2. In Figures 1 and 2, 1
Reference numeral 4 denotes a magnetic material attached to the outer circumferential surface 4D of the collect member 4, and is fixed to a mounting portion 4E formed by cutting out the upper part of the outer circumferential surface 4D of the collect member 4. The outer circumferential surface of the magnetic body 14 is slightly smaller than the outer circumferential surface 4D of the collect member 4, that is, the gap G
It is formed small. Reference numeral 13 denotes a magnetic material attached to the inner circumferential surface 3G of the collet 3, and is fixed to a mounting portion 3H formed by cutting out the upper portion of the inner circumferential surface 3G of the collet 3. The inner peripheral surface of the magnetic body 13 is formed to have the same diameter as the inner peripheral surface 3G of the collect 3. Therefore, when the outer circumferential surface 3D of the collect member 4 is in contact with the inner circumferential surface 3G of the collect 3, the space between the magnetic bodies 13 and 14 is maintained by the gap G, and when the gap G is minimum, the attraction force is reduced. is maximum.

Both of the magnetic bodies 13 and 14 may be ring-shaped, or one of them may be ring-shaped and the other may be arc-shaped. Furthermore, both of the magnetic bodies 13 and 14 may be permanent magnets, or only one of them may be a permanent magnet. The magnetic body 14 is formed higher than the magnetic body 13 so that it always faces the magnetic body 13 even when only the collect member 4, that is, the magnetic body 14 moves.
Attractive force is always working between 14.

The outer circumferential surface of the magnetic body 14 may have the same diameter as the outer circumferential surface 3D of the collect member 4, and the inner circumferential surface of the magnetic body 13 may be made larger than the inner circumferential surface 3G of the collect 3 by a gap G. Further, the outer peripheral surface of the magnetic body 14 is formed to be smaller than the outer peripheral surface 3D of the collect member 4, and the inner peripheral surface of the magnetic body 13 is formed to be larger than the inner peripheral surface 3G of the collect 3. It may be set to gap G.

Next, the operation will be explained. During the clamping operation, the pressing force of the collector member 4 is greater than the attractive force acting between the magnetic bodies 13 and 14, so the collector member 4 is pushed down and the inclined surface 4C of the collector member 4 is pressed down. begins to come into pressure contact with the inclined inner surface 3E of the collet 3. As this pressure welding progresses, the gap G between the magnetic bodies 13 and 14 increases and the attractive force decreases.
The collet 3 receives pressure from the collet member 4 and expands radially outward. Then, the alignment surface 3B of the collet 3 similarly expands outward, and the alignment surface 3B
is pressed against the center hole forming surface 2B of the floppy disk 2 to center the floppy disk 2, and is also pressed against the inner wall surface 1A of the spindle 1. This pressure contact completes the clamping operation of the floppy disk 2.

When the clamp is released, the pulling force of the collect member 4 is greater than the attractive force acting between the magnetic bodies 13 and 14, so the collect member 4 is pulled up, and the inclined surface 4C of the collect member 4 and the inclined inner surface of the collect 3 are pulled up. 3
Pressure contact with E begins to be released. As this release progresses, the gap G between the magnetic bodies 13 and 14 becomes smaller and the attractive force increases, and when the outer circumferential surface 4D of the collect member 4 and the inner circumferential surface 3G of the collect 3 come into contact, the gap G becomes the minimum. The suction power is maximum. As the release progresses, the pressing force from the collet member 4 also decreases, so that the collet 3 recovers elastically, but even if the collet 3 does not recover elastically due to the creep phenomenon, the suction force ensures that the collet 3 recovers. Therefore, the pressure contact between the alignment surface 3B of the collet 3 and the center hole forming surface 2B of the floppy disk 2 is also released. Continuing, while the pressing force of the pressing surface 3A of the collet 3 is also reduced, the collet 3 is
is pulled up, and the clamp release is completed.

[Effect of idea]

As explained above, in this invention, a magnetic material is mounted on the outer circumferential surface of the collector member, and a magnetic material having a gap with the magnetic material is mounted on the inner circumferential surface of the collet. In this invention, since an attractive force is exerted between the magnetic materials, when the clamp is released,
This suction force is added to the elastic restoring force of the collet, and the collet is reliably restored to its original state, eliminating pressure contact with the floppy disk. Therefore, according to this invention, it is possible to prevent the center hole forming surface of the floppy disk from being deformed or damaged, regardless of the structure for moving the collect guide shaft.

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing an embodiment of this invention. Figure 1 shows the injected state, Figure 2 shows the clamped state, and Figures 3 and 4 show the prior art. 3 is a diagram showing an injected state, and FIG. 4 is a diagram showing a clamped state. 1...Spindle, 2...Floppy disk, 3...Collection, 4...Collection member, 6...
...Collection guide shaft, 13, 14...Magnetic material.

Claims (1)

[Claims for Utility Model Registration] 1. A collet that generates pressing force and pressing force by a collet member is fitted onto a spindle through the center hole forming surface of the floppy disk, and the collet and spindle generate the floppy disk. In a disk clamping device for a floppy disk drive that fixes a floppy disk, a magnetic material is attached to the outer peripheral surface of the collector member, and a magnetic material having the magnetic material and a gap is attached to the inner peripheral surface of the collect. A disk clamping device for a floppy disk drive. 2. A disk clamping device for a floppy disk drive according to claim 1, wherein both the magnetic material of the collet member and the magnetic material of the collet are ring-shaped. 3. The floppy disk drive according to claim 1, wherein one of the magnetic bodies of the collet member and the magnetic body of the collet is ring-shaped and the other is formed of a plurality of arc-shaped pieces. Disc clamp device. 4. A disk clamping device for a floppy disk drive according to claim 1, 2 or 3, wherein both the magnetic material of the collet member and the magnetic material of the collet are permanent magnets. 5. A disk clamping device for a floppy disk drive according to claim 1, 2 or 3, wherein only one of the magnetic material of the collet member and the magnetic material of the collet is a permanent magnet. 6 The outer peripheral surface of the magnetic material of the collet member is formed smaller than the outer peripheral surface of the collet member, and the inner peripheral surface of the magnetic material of the collet has the same diameter as the inner peripheral surface of the collet. 6. A disk clamp device for a floppy disk drive according to item 1, 2, 3, 4 or 5. 7. Utility model registration claim No. 7, in which the outer circumferential surface of the magnetic material of the collet member has the same diameter as the outer circumferential surface of the collet member, and the inner circumferential surface of the magnetic material of the collet is formed larger than the inner circumferential surface of the collet. 6. A disk clamp device for a floppy disk drive according to item 1, 2, 3, 4 or 5. 8 Utility model registration claim 1, in which the outer circumferential surface of the magnetic material of the collet member is smaller than the outer circumferential surface of the collet member, and the inner circumferential surface of the magnetic material of the collet is larger than the inner circumferential surface of the collet.
6. A disk clamp device for a floppy disk drive according to item 2, 3, 4 or 5.