JPH0610910B2 - Disk fixing mechanism - Google Patents

Description

The present invention relates to a mechanism for fixing a disk placed on a turntable in a magnetic disk inspection device.

[Prior Art] A magnetic disk (hereinafter, simply referred to as a disk) that is widely used in an information processing apparatus is subjected to various inspections in a manufacturing process. In the inspection, the disc is placed and fixed on a turntable and rotated by a spindle motor. In this case, it is needless to say that the discs should be fixed stably and surely without causing harmful distortion. However, in order to rapidly inspect a large number of discs,
There is a need for easy replacement of the disc under test.

FIG. 3 (a) shows an example of a conventionally used disc fixing mechanism. The disc 1 is a spindle motor 2
It is placed on a turntable 22 fixed to a rotating shaft 21 of the. On the other hand, the fixing portion 3 is inserted into the rotary shaft from above, and the pressing surface 32 of the pressing tool 31 of the fixing portion presses the periphery of the center hole of the disk. The inserted fixing part is temporarily fixed by inserting the internal ball 33 into the recess 23 in the upper part of the rotating shaft 21, and when replacing the disk, the fixing part is pulled out from the rotating shaft. FIG. 3 (b) shows a pressing position of the disk 1, and a ring portion (hereinafter referred to as a pressing area) 13 around the circumference 12 of the center hole 11 of the disk where information can be pressed without recording information 13 Is provided, and the pressing surface 32 presses the entire circumference of this area. In this way, it is preferable to press the disc over the entire circumference because distortion is less likely to occur. However, the above-mentioned fixture needs to be removed for the convenience of disc replacement, and it is impossible when the number of handling is large. It should be noted that rubber is attached to the pressing surface 32 to make elastic contact with the disk. The purpose of this is that the disk has a curvature with a smaller wavelength but a larger wavelength than when it is manufactured. Correcting by pressing with is said to have the opposite effect of drawing out unnecessary harmful minute irregularities, and therefore pressing is performed with a large wavelength curve. However, since the rubber is directly pressed against the disk, there are drawbacks such that the disk is lifted while being attached to the fixture due to adhesion during replacement, and a trace of the rubber remains on the disk surface.

In order to eliminate some of these drawbacks, there is "Japanese Patent Application No. 61-90101 (Japanese Patent Application Laid-Open No. 62-248159), disk fixing mechanism" which has been filed by the inventor of the present invention. This will be explained with reference to (a), (b) and (c).
In FIG. 1A, a vertically movable central shaft 41 is passed through the center of a rotary shaft 21 of a spindle motor 2 and a pressing mechanism 4 is attached to the head thereof. Multiple pressing mechanisms (4 in this case)
Individual support arms 42 are radially arranged, and the links 43 are urged inward by springs (not shown) at the respective tips.
Is provided, and the roller 44 is attached to the lower end thereof. The pressing mechanism 4 is driven by the vertical drive mechanism 45 from the position of FIG.
When the link is lowered to the position, the link opens outward and the roller presses the pressing area of the disk. In this case, it is advantageous that the disc can be replaced by merely raising the central axis, but as shown in FIG. 6 (c), the contact area of the roller with respect to the pressing area 13 is small. Since it is a point contact, so to speak, the disadvantage is that harmful distortion occurs on the disc.

[Problems to be Solved] It is necessary to eliminate all the conventional drawbacks described above. That is, in the magnetic disk inspecting apparatus, the disk can be easily replaced, and the area for pressing the disk extends over the entire circumference of the pressing area and is elastically contacted with the disk surface so that a large wavelength curve existing on the disk surface can be obtained. A fixation mechanism that does not force straightening is desirable and the present invention is directed to providing such a mechanism.

[Means for Solving the Problems] The present invention relates to a disk fixing mechanism in an inspection device for fixing a turntable to a rotary shaft of a spindle motor and inspecting a magnetic disk mounted on the turntable, and A center shaft that penetrates through the center of the rotating shaft and that moves up and down by a vertical movement mechanism is provided, and a pressing mechanism part is provided above this center shaft, and it is cylindrical and is fixed to the turntable through the center shaft. And a chuck piece guide.

The pressing mechanism portion has a plurality of support arms radially attached to the head of the central shaft, and a chuck piece attached to the tip of each support arm. Each chuck piece rises as the central axis rises and contracts like an umbrella, and the central hole of the disk is inserted into this, and the disk is placed on the turntable. Further, each chuck piece descends as the central axis descends and opens like an umbrella, and by further descending, the lower surface presses and fixes the pressing area around the central hole of the disk placed on the turntable. In this case, the pressing surfaces of the plurality of chuck pieces divide the entire circumference of the pressing area and fix the entire circumference. Further, the chuck piece guide has its outer peripheral surface slidingly contacting the inner surface of the chuck piece, and contracts and opens the chuck piece as the central axis rises and falls.

The chuck piece described above has a substantially "" shape in vertical cross section, and is rotatably supported in the radial direction of the turntable within a certain range in a substantially central portion of the support arm with its short side being horizontal. In addition, "the longer side of the shape is the vertical direction, the inner surface that makes sliding contact with the chuck piece guide is almost" cubic ", and the chuck piece that makes sliding contact in the lower straight part of the rectangular shape as the center axis descends. Similarly, the upper half straight portion has a shape in which the opening angle of the chuck piece is kept constant.

Next, at the bottom of the chuck piece, with an elastic body interposed,
A blade is added to contact and press the disk.

[Operation] In the disk fixing mechanism according to the present invention having the above-described configuration, the chuck piece contracts as the central axis rises, so the disk is mounted on the turntable with the central hole inserted therein. Then, when the central axis is lowered, the chuck piece is opened to some extent, and then the chuck piece is lowered with the opening angle, and the pressing surface presses the pressing area of the disk. In the pressing range, since the pressing surfaces of the plurality of chuck pieces cover almost the entire circumference of the pressing area, the disk surface is not distorted. Further, the pressing is safe without forcibly correcting the large wavelength curve existing on the disk surface due to the elastic body interposed below the chuck piece.

[Embodiment] FIGS. 1 (a), (b) and (c) show the structure of an embodiment of a disk fixing mechanism according to the present invention. FIG. 1 (a) is a perspective external view and FIG. Partial plan view, FIG. (C) is a vertical sectional view with respect to the central axis. In each figure, a turntable 22 is fixed to a rotary shaft 21 of the spindle motor 2. The rotating shaft 21 penetrates the central shaft 41 and moves up and down by a vertically moving mechanism 45. A plurality of (four in the figure) supporting arms 5 are radially provided on the head of the central axis, and chuck pieces 6 are provided at the tips of the supporting arms so that they can rotate within a certain range in the radial direction of the turntable. It is pivotally supported by a pin 61. The vertical cross section of the chuck piece has a "" shape, the short side of which is horizontal and is axially supported as described above, and the inner surface of the long side is "shaped". On the other hand, the central chuck is provided with a cylindrical chuck piece guide 7 penetrating the central shaft and fixed to the turntable. In Figure (c), the left figure shows the state where the central axis is raised by the vertical movement mechanism, and the rectangular lower half straight part of the inner surface of the chuck piece contacts the peripheral edge of the upper part of the chuck piece guide, and The outer surface 63 is vertical. In this state, the disc 1 is placed on the turntable with the center hole 11 inserted therein. Next, when the central axis descends, the chuck piece gradually opens outward due to the inclination of the lower half of the rectangular shape of the chuck piece. The pressing surface 65 of the chuck piece presses the disc. in this case,
The surface of the upper end 62 of the chuck piece comes into contact with the lower surface 51 of the support arm 5 to stop the opening angle of the chuck piece constant.

FIG. 1 (b) shows the division of the chuck piece into the pressing area of the disk, in which case four chuck pieces press the entire circumference of the pressing area 13 into four equal parts. In this way, since the pressing is applied to the entire circumference of the pressing portion, it is possible to avoid distortion, but as described earlier, it is forcibly made flat on the curved surface having a large wavelength existing in the disk. Since straightening has a harmful effect, an elastic body 64 is interposed below each chuck piece, and a metal blade (plate) 65 is attached below the elastic body 64 to form a pressing surface against the disc. Although not shown, a spring is provided in the vertical movement mechanism 45, and the central shaft is urged downward so that the pressing surface elastically presses the disk.

There are various sizes of magnetic disks, and the larger the size, the larger the diameter of the central hole. With respect to the central hole having a large diameter, the number of the four chuck pieces as described above increases because of the increase in size and weight, which makes the operation unreasonable. Therefore, the number of supporting arms is made equal to this.

FIGS. 2 (a), (b) and (c) explain the number of chuck pieces with respect to the disc size. FIG. 2 (a) shows 3.5.
Inch, figure (b) shows 5 inch, and figure (c) shows the case of 8 inch. Here, the chuck pieces of the same size are used in each case, and the number is 4, 5 inches, 6 inches, and 8 inches for 3.5 inches. The arc of the chuck piece is manufactured to fit 3.5 inches, so 5
The curvature of the circular arc does not match the inch and 8 inches, but there is no problem because the width Δr of the pressing area of the disk has a margin. The same chuck piece is advantageous in manufacturing.

[Effects of the Invention] As is clear from the above description, in the disk fixing mechanism according to the present invention, the vertical movement mechanism raises the central axis to contract the chuck piece, and the magnetic disk can be placed on the turntable. Therefore, it is easy to replace the disc. Next, the chuck piece is opened by lowering the central axis to press the pressing portion of the disk. Since the pressing surface covers the entire circumference of the pressing area of the disk, unnecessary distortion does not occur in the disk, and since the pressing is elastic, the large-wavelength curvature existing in the disk is not forcibly corrected. At the same time, since the pressing surface is a metal blade, the adhesion that occurs in the case of conventional rubber,
Or, the possibility of traces is completely eliminated, and a highly efficient and stable disk fixing mechanism can be provided for a magnetic disk inspection apparatus that handles a large number of magnetic disks continuously. Further, it is needless to say that the present invention can be applied not only to magnetic disks but also to similar disks, and the effect is great.

[Brief description of drawings]

1 (a), (b) and (c) are structural views of an embodiment of a disk fixing mechanism according to the present invention, and FIGS. 2 (a), (b) and (c).
Fig. 3 is a diagram showing the number and arrangement of chuck pieces for various disc sizes in the disc fixing mechanism according to the present invention. Figs. 3 (a) and 3 (b) are structural sectional views of a conventional disc fixing mechanism and a magnetic disc pressing force. Figure showing region, 4th
FIGS. (A), (b), and (c) are structural views of a disk fixing mechanism according to the previously filed application. 1 ... Magnetic disk, 11 ... Center hole, 12 ... Center hole circumference, 13 ... Pressing area, 2 ... Spindle motor, 21 ... Rotating shaft, 22 ... Turntable, 23 ... Rotating shaft Recessed part, 3 ... fixed part, 31 ... pressing tool, 32 ... pressing surface, 33 ... ball, 4 ... pressing mechanism, 41 ... central axis, 42 ... support arm, 43 ... link, 44 ...... Roller, 45 ・ ・ ・ Up and down movement mechanism, 5 …… Support arm, 51 …… Lower surface of support arm, 6 …… Chuck piece, 62 …… Elastic body, 65 …… Pressing surface of metal blade, 7 …… Chuck Peace guide.

Claims (3)

[Claims] 1. A magnetic disk inspection apparatus for fixing a turntable to a rotary shaft of a spindle motor and inspecting a magnetic disk mounted on the turntable, wherein a vertical movement mechanism is provided to penetrate a center of the rotary shaft. Provided with a central shaft that rises and descends, a plurality of support arms radially attached to the head of the central shaft, and pivotally supported at the respective tip ends of the support arms, and ascends as the central shaft rises. The magnetic disk with the center hole inserted is placed on the turntable, and is lowered as the central axis descends to open like an umbrella, and further descends so that the lower surface is placed on the turntable. The magnetic disk has a pressing mechanism portion composed of a plurality of chuck pieces for dividing and pressing and fixing the pressing area around the central hole of the magnetic disk, and the central axis is centered in a cylindrical shape. It is movably penetrated downward and fixed to the turntable, and the outer peripheral surface is in sliding contact with the inner surface of the chuck piece, and the chuck piece guide contracts and opens the chuck piece as the central axis rises and falls. A disk fixing mechanism characterized by being configured. 2. A vertical cross section having a substantially "" shape, wherein the short side of the "" shape is horizontal and is rotatably supported at a substantially central portion of the support arm in the radial direction of the turntable within a certain range. , "The long side of the shape is the vertical direction, and the inner surface that is in sliding contact with the chuck piece guide is almost" shaped ",
As the central axis descends, the chuck piece that is in sliding contact with the lower linear portion of the rectangular shape is opened, and the opening angle of the chuck piece that is also sliding contact with the upper linear portion is constant. The disc fixing mechanism according to claim 1, wherein the chuck piece has a. 3. The disk fixing mechanism according to claim 1, wherein a blade for contacting and pressing the magnetic disk is provided below the chuck piece via an elastic body.