JPS5873074A - Disc retention mechanism - Google Patents

Abstract

PURPOSE:To hold a disc rotatably driven with good accuracy through centering, by inserting a shaft to a hollow pressurizing shaft having a plurality of slots. CONSTITUTION:In a disc holding state, a part of the tip of a rotary shaft 3 is inserted, the outer diameter of a hollow pressurizing shaft with slots is spread, the diameter contacts a reinforced ring inner diameter of a disc 1 for centering. Considering that the disc is not held, the hollow inner diameter of a hollow pressing shaft 7 with slots and an outer diameter of the rotary shaft 3 projected in a recessed hub 9 are in the relation of size of ''interference fit'' and the inner diameter of a reinforcement ring 10 and the outer diameter of a small diameter part 7a of a projected pressing shaft 7 with slots are in the relation of size of ''clearance fit''. Thus, centering with high accuracy can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mechanism for holding a rotationally driven disk on a rotating drive body in a magnetic recording/reproducing device using a magnetic disk as a recording medium, and particularly relates to a mechanism for holding a rotationally driven disk on a rotating drive body. The present invention relates to a disk holding mechanism suitable for accurately aligning the center of the disk and the rotational drive center when attaching and detaching the disk.

There is a need to accurately align and maintain the center position of a rotatably driven disk in many industrial and consumer magnetic recording and reproducing apparatuses.

For example, office computers, personal computers,
-A flexible disk used as a recording medium for a data storage device has a center alignment l#1. It is necessary to maintain f, reproducibility, and a mechanism that fully satisfies compatibility between a number of driving devices. Particularly in recent years, with the increase in track density, tolerances for mounting errors such as eccentricity caused by the disk holding mechanism have become increasingly strict, and various inventions and ideas have been developed for the disk holding mechanism and the periphery of the disk center opening. being done.

FIG. 1 is a schematic cross-sectional view showing a conventional holding mechanism in a disk holding state. In the figure, 1 has a central opening;
It is a flexible disk with a thickness of 80 μm and almost uniform over the entire surface, and 2 is its protective gate.

Index hole 1. Items not directly related to the present invention, such as windows and liners, are omitted. This flexible disk 1 is inserted through the center opening, is held by a pressurizing shaft 5 that is fitted into a field hub 4 coaxially fixed to a rotating shaft 3, and is coaxially driven to rotate integrally with a rotating shaft 6. Ru. In this process of being held, lI! The center opening of the flexible disk 1 is pushed by the pressure shaft 5. The concave hub 4 is also important for placing the peripheral edge of the center opening of the flexible disk 1 on its upper surface and for maintaining the correct relative position with the magnetic head (r shown in the figure). It is fixed. On the other hand, the pressure shaft 5 is movable in the direction shown by the arrow 6 in order to attach and detach the disk. In such a holding mechanism, since the flexibility of the disk 1 itself is utilized, damage such as waving is likely to occur on the periphery of the center opening, especially when the disk is attached and detached many times. The disadvantage is that it deteriorates and eventually it becomes impossible to read out the information already stored in the IF#. This drawback is largely due to the problem with the strength of the flexible disk 1, especially at the periphery of the central opening.In order to improve this problem, the flexible disk disclosed in JP-A No. 50-28302 "Flexible Disc" has a A reinforcing ring made of metal or synthetic resin is provided around the opening. However, when this oak flexible disk 1 is held by the conventional holding mechanism shown in FIG. , rather it deteriorates. This is because by providing a reinforcing ring, the flexibility of the center opening periphery is lost and it becomes impossible to push it open with the pressurizing shaft 5, so the dimensional relationship between the center opening diameter and the pressurizing shaft diameter is ,
This is because it becomes a so-called ``sukihame'' relationship.

Therefore, it is not possible to absorb variations (errors) in the center opening diameter and pressurizing shaft diameter that exist between multiple disks and drive IIh devices. , there is a big problem.

Therefore, when using the conventional disk holding mechanism shown in FIG.
Advantages of the 几 disk disclosed in ``Flexible Disk'' 1. In other words, it may be difficult to take full advantage of the advantage that the peripheral edge of the center opening will not be damaged even if it is attached and detached many times and to improve the accuracy of center positioning.

The object of the present invention is to provide a reinforcing ring or the like on the periphery of the center opening even when a disk is used in which the periphery of the center opening does not have flexibility.

It is an object of the present invention to provide a disk holding mechanism capable of accurately aligning the center of a disk.

In order to achieve the above object, in the disk holding mechanism according to the present invention, the pressurizing shaft is formed hollow with a plurality of slots, the hollow part (hole) K axis of the pressurizing shaft is inserted, and this shaft allows The hollow pressure shaft is pushed out to bring the outer diameter portion of the pressure shaft into contact with the peripheral edge of the center opening of the disk, thereby aligning the center of the disk.

Embodiments of the present invention will be described below with reference to FIGS. 2 and 3. FIG. 2 is a schematic cross-sectional view showing the holding mechanism according to the invention in a state in which a disk is held. In the figure, 7 is a small diameter portion 7a.

A hollow pressurizing shaft (hereinafter referred to as a slotted hollow pressurizing shaft) 9 consisting of a large diameter portion 7b and having a plurality of slots in a fixed direction that substantially coincides with the axial direction of the rotating shaft 3 (+4) 8 t- is a recessed hub, and the tip of the rotary shaft 5 protrudes by a predetermined length into the recess. Further, 10 is a reinforcing link. In the disk holding state shown in the figure, a part of the tip of the rotary shaft 3 is inserted into the hollow part (hole) of the slotted hollow pressurizing shaft. The outer diameter of the shaft is expanded and brought into contact with the inner diameter of the reinforcing ring of the disk 1, thereby performing center alignment.

Considering the case where the slotted hollow pressure shaft 7 and the recessed hub 9t are in a standalone state, that is, when they are not in a disk holding state, the hollow inner diameter (hole diameter) of the slotted hollow pressure shaft 7 and the recess Rotating shaft 5 protruding into hub 9
The outer diameter of
In addition, the inner diameter of the reinforcing ring 10 and the outer diameter of the small diameter portion 7a of the slotted hollow pressure shaft 7 have a "clearance fit" (substantially a tight fit). The dimensional relationship is set to a "loose fit" (hereinafter referred to as "loose fit").

The dimensional relationship between the inner diameter of the reinforcing ring and the outer diameter of the small diameter portion of the slotted hollow pressurizing shaft is a so-called "tight fit" type.Moreover, since the rotating shaft 9 is used directly as a guide, Highly accurate center positioning is possible. Further, there may be a sufficient clearance between the inner diameter of the recessed portion of the rotary hub 9 and the outer diameter of the small diameter portion of the hollow pressurizing shaft 7 with a rod, even when the disc is in a state of corrosion. In addition, in FIG. 2, a slot is also provided in the large diameter portion 7b opposite to the disk mounting portion of the reading hub 9, that is, the portion in contact with the reinforcing ring 10, or the perspective view in FIG. As shown, the small diameter portion 7a
A similar effect can be obtained by providing a number of slots. Furthermore, the tip of the rotating shaft 3 and the slotted hollow pressurizing shaft 7
It is also possible to provide a taper in the hollow part to make insertion easier. Furthermore, the direction in which the slots are installed does not have to be substantially the same as the direction of the rotation axis as in this embodiment.

As explained above, by inserting a part of the tip of the rotary shaft into the hollow part (hole) of the hollow pressure shaft having a plurality of slots in a "striped fit" shape 1i1, the slot It is possible to align the center with high precision by expanding the outer diameter of the hollow pressure shaft and bringing it into contact with the inner diameter of the reinforcing ring.

As explained above, according to the present invention, by fitting the rotating shaft into the hollow part (hole) of the slotted hollow pressure shaft, the outer diameter of the slotted hollow Calo pressure shaft is pushed and expanded, so the rotating shaft It is possible to perform highly accurate disc center positioning.

Furthermore, since it has multiple slots, there is some flexibility in how the outer diameter of the slotted hollow pressure shaft expands, and the center opening diameter between the multiple disks. Variations can be absorbed. Furthermore, by taking advantage of the feature of the disk provided with the reinforcing ring, that is, the fact that the center opening periphery is not damaged by repeated attachment and detachment, the reproducibility of disk center positioning can be greatly improved.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view schematically showing a conventional disk holding mechanism, Fig. 2 is a cross-sectional view schematically showing an embodiment of the disc holding mechanism according to the present invention, and Fig. 3 shows a slot. It is a perspective view of a hollow pressurizing shaft with a slot. Explanation of symbols 3...Rotating shaft, 7...Hollow pressurizing shaft with a slot, 7a
...Small diameter part, 7b...Large diameter part, 8...Slot,
9... Recessed hub, 10... Reinforcement ring. Representative Patent Attorney Susuki 1) Yuki Toshi

Claims (1)

[Scope of Claims] A mechanism for removably and rotatably holding a disk having a central opening in the center and made of a hard material at the peripheral edge of the central opening, wherein the disk has an a# on its upper surface. A rotatable recess into which one end of the rotary shaft protrudes by a predetermined length, a small diameter portion having a plurality of slots, and a disc placed on the recessed hub from above. Has a large diameter part that pressurizes, and has a swing of 9
It is equipped with a slotted hollow pressurizing shaft that can move, move up and down, and rotate, and if the diameter of the rotating shaft protruding into the recess of the recessed hub and the inner diameter of the hollow part of the slotted hollow pressurizing shaft are t#). In addition, the disc center opening diameter and the slot. The diameter of the small diameter part of the slotted hollow pressure shaft is set to have a tight fit; When the disk is mounted on the upper surface of the knitted hub, the hollow part of the slotted hollow pressure shaft is set to the A disk holding device that is inserted through a rotary shaft protruding into a recessed hub, thereby aligning the center of the disk with the small diameter portion of the slotted hollow pressurizing shaft and holding the disk with the large diameter portion. mechanism.