JPS6232370Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a disk clamping mechanism for a flexible magnetic disk drive.

A conventionally used medium (a flexible magnetic disk housed in a jacket) and a disk clamping mechanism for clamping the medium into a flexible magnetic disk drive will be described with reference to FIGS. 1 to 3.

First, to briefly explain the mechanism of the media 1 with reference to FIG. 1, 2 is a jacket that houses a flexible magnetic disk 3, and this jacket 1 includes a write-protect notch 2a, a clamping hole 2b, A sector hole 2c and a read/write window 2d with which a head (described later) comes into contact are formed. The openings 2b, sector holes 2c, and window holes 2d are also formed at corresponding positions on the back surface of the jacket 2. Further, a center hole 3a is bored in a portion of the flexible magnetic disk 3 facing the opening 2b.
The inner diameter of this center hole 3a is the same as the outer circumference of the collect, which will be described later.

Next, FIG. 2 shows a flexible magnetic disk drive device into which the media 1 is loaded. In the figure, reference numeral 5 is a base frame, 6 is a door for loading and unloading the media 1, and 7 is a hub frame. , this hub frame 7 is attached to the rear part of the base frame 5 via a leaf spring hinge 8.

And a little door 6 in the center of this hub frame 7
A disk clamp mechanism 9 as shown in FIG. 3 is disposed at a closer position.

In the disk clamp mechanism 9, reference numeral 11 is a spindle, 12 is a hub, and the spindle 11 is fixed to the rotating shaft 13a of the drive motor 13.
A circular recess 11a centered on the axis of the rotating shaft 13a and a disk receiving surface 11b along the periphery of the circular recess 11a are formed on the upper surface of the figure.

On the other hand, the hub 12 includes an outer peripheral part 12a that contacts the inner peripheral surface of the circular recess 11a, and a disk guide 12b that is tapered from the outer peripheral part 12a.
and a disk pressing surface 12c corresponding to the disk receiving surface 11b are formed. A hub attachment member 14 is fitted and fixed into the hub 12, and the hub attachment member 14 is attached to a rotating shaft 16 via a bearing 15. Due to this mounting mode, the hub 12 is rotatable about the rotation shaft 16, but movement in the radial direction about the rotation shaft 16 is restricted. The rotation shaft 16 is loosely inserted into a shaft hole 7a bored in the hub frame 7, and a helical spring 18 is compressed between the E ring 17a fixed to the rotation shaft 16 and the hub frame 7. In other words, the rotation shaft 16, in other words, the hub 12, is configured to be able to elastically move with respect to the hub frame 7. 17
b is an E-ring for retaining.

Reference numeral 21 in FIG. 2 is a head mechanism section, and this head mechanism section 21 has a movable body 2 to which a head 22 is fixed.
3, and a rotating arm 25 to which a loading pad 24 is attached is disposed opposite the head 22. The moving body 23 is movably supported by a guide shaft 26.

Then, with the door 6 pushed open and the hub frame 7 rotated upwards by the required amount, insert the media 1 into the device.
Insert. At this time, the media 1 is inserted to a position where the center hole 3a defined by a stopper (not shown) approximately coincides with the inner circumferential circle of the disk receiving surface 11b. Next, when the door 6 is closed, the hub frame 7 is lowered, and during this lowering process, the disk guide 12b comes into sliding contact with the center hole 3a, moves and positions the flexible magnetic disk 3 to a predetermined position, and aligns the disk with the disk receiving surface 11b. Pressure surface 1
The flexible magnetic disk 3 is clamped between the flexible magnetic disk 2c and the magnetic disk 2c. The clamped flexible magnetic disk 3 is driven by a drive motor 13 at a rotation speed of about 300 revolutions per minute to perform reading and writing.

However, in the disk clamp mechanism 9 of such a conventional flexible magnetic disk drive device, the hub 12 is attached to the rotation shaft 16 with movement in the radial direction restricted, and the hub 12 is attached to the hub frame 7. On the other hand, since the hub mounting member 14, rotation shaft 16, etc. are configured to be able to elastically move together, when guiding the center hole 3a with the disk guide 12b, the center hole 3a portion There was a problem in that the load on the center hole 3a was relatively large and the center hole 3a was easily damaged. Incidentally, if the center hole 3a is damaged, it becomes impossible to position the flexible magnetic disk 3 at a predetermined position, making accurate reading impossible.

This invention was made with attention to such problems, and is a disk of a flexible magnetic disk drive device that can position and clamp a flexible magnetic disk at a predetermined position without damaging the center hole part. The purpose is to provide a clamping mechanism.

This invention will be explained below based on the drawings.

FIGS. 4 to 8 are diagrams showing embodiments of this invention.

In each of the figures from FIG. 4 onward, the same or equivalent members or parts as those in FIGS. 1 to 3 are designated by the same reference numerals and redundant explanations will be omitted.

To explain the structure, in this invention, as shown in FIG. 8, first, a circular centering taper guide 11c is formed at the bottom of the circular recess 11a in the spindle 11, centered on the axis of the rotating shaft 13a. ing.

On the other hand, the hub side corresponding to this pindle 11 is
As shown in FIGS. 5 and 6, it is divided into a hub 28 and a collet 29. The disk pressing surface 28a of the hub 28 is formed into a so-called mid-height tapered shape with a slightly higher inner side. In addition, the hub 28 has, for example, four collet engaging portions 2 at equidistant positions around the axis of the rotating shaft 16.
8b is provided. The hub 28 formed in this manner is directly fixed to the bearing 15.

Further, as shown in FIGS. 6 and 7, the collet 29 has a plurality of collet structures 29c, 29c, . . . divided by slots 29a, 29b, . is displayed. By integrating these plurality of collect structures 29c, 29c, an outer peripheral portion 29d,
A disk guide 29e extends downward in FIG. 6 in a tapered manner from the outer circumferential portion 29d, and a sliding contact portion 29f concentric with the outer circumferential portion 29d is formed at the lower end of the disk guide 29e. Furthermore, four locking claws 29g corresponding to the collector locking portions 28b are protruded from the bowl-shaped portion 29a. The engaging claws 29g are engaged with the collet engaging portions 28b, and the collet 29 is suspended from the hub 28 in a floating state.

Next, the action will be explained.

After opening the door 6 and rotating the hub frame 7 upward by a required amount, the media 1 is inserted. In this initial insertion state, the center hole 3a and the inner circumferential circle of the disk receiving surface 11b are normally slightly misaligned. Next, when the hub frame 7 is lowered by closing the door 6, the collet 29 is lowered during this lowering process.
In this case, the sliding contact portion 29f is guided by the taper guide 11c, and the center line of the collet 29 is aligned with the rotation axis 13a.
It is centered to match the axis of the In this way, while centering the collect itself, the disk guide 12b is aligned with the center hole 3a.
The flexible magnetic disk 3 is positioned in a predetermined position by slidingly contacting the disk. At this time, the collet assembly 29c forming the disk guide 12b is divided into individual sections and has flexibility, and the entire collet 29 is suspended from the hub 28 in a loose state, so that the center hole 3a section A relatively light load of only the collet 29 is elastically applied to the collet 29. This prevents damage to the center hole 3a portion. Then, with the disk receiving surface 11b and the disk pressing surface 12 positioned in this manner,
The flexible magnetic disk 3 is clamped between it and c. In this clamped state, due to the action of the helical spring 18 and the like, as shown in FIG. The clamp is secured by coming into contact with the

As shown in FIG. 4, the outer surface of the bowl-shaped portion 29a of the collet 29 is slightly lifted from the inner surface of the spindle 11. The outer surface of the lever may be brought into sliding contact with the inner side of the tapered guide 11c forming portion, and the centering of the collet 29 may also be performed by the outer surface of the bowl-shaped portion 29a.

As detailed above, according to this invention, a centering taper guide is formed in the circular recess of the spindle, a corresponding sliding contact part is formed in the collet, and furthermore, this collet is attached to the hub in a floating state. Since the collet itself is suspended in a substantially centered state, the flexible magnetic disk is positioned and guided, and the load on the center hole portion is reduced during guiding, so that almost no load is placed on the center hole portion. The advantage is that the flexible magnetic disk can have a longer lifespan without causing any damage.

[Brief explanation of the drawing]

Figure 1 is a plan view of a conventionally used media, Figure 2 is a side sectional view showing a flexible magnetic disk drive device equipped with a conventional disk clamp mechanism, and Figure 3 is the same disk clamp mechanism as above. FIG. 4 is a side sectional view similar to FIG. 3 showing an embodiment of the disk clamp mechanism of the flexible magnetic disk drive device according to the invention, and FIG. 5 is an enlarged side sectional view showing the same disk. 6 is a partially sectional side view showing the hub in the clamp mechanism taken out, FIG. 6 is a partially sectional side view showing the collet taken out similarly to FIG. 5, FIG. 7 is a bottom view of FIG. 6, and FIG. This figure is a partially sectional side view showing the spindle taken out, similar to FIG. 5. 3... Flexible magnetic disk, 3a... Center hole, 7... Hub frame, 11... Spindle, 11a... Circular recess, 11b... Disc receiving surface, 11c... Taper guide, 13... Drive motor , 13a...rotation axis, 16...rotation axis, 28...
...Hub, 28a... Disk pressing surface, 29... Collet, 29d... Outer circumferential part, 29e... Disk guide, 29f... Circumferential part.

Claims (1)

[Claims for Utility Model Registration] A circular recess fixed to the rotating shaft of the drive motor and centered on the axis of the rotating shaft, and a disk receiving surface along the periphery of the circular recess; A spindle in which a circular centering taper guide centered on the axis is formed on the bottom, and a disk rotatably attached to the hub frame corresponding to the spindle and corresponding to the disk receiving surface. a hub having a pressing surface; a disk guide suspended from the hub in a floating state and tapered from an outer circumference that abuts the inner circumference of the circular recess; and a disk guide formed at a lower end of the disk guide and configured to A collet is provided with a sliding portion concentric with the outer circumferential portion guided by a centering taper guide, and the collet is fitted into a center hole of a flexible magnetic disk to be loaded and the disk is inserted into the center hole. A disk clamping mechanism for a flexible magnetic disk drive device, characterized in that the flexible magnetic disk is centered and clamped between a receiving surface and a disk pressing surface.