JPS62159372A - Disk clamping mechanism - Google Patents

Abstract

PURPOSE:To easily perform an accurate center positioning, and to prevent a medium from being damaged by providing a collet-shaped lower clamp, a turntable for temporary holding, and an upper clamp. CONSTITUTION:The titled device is equipped with a collet-shaped lower clamp 8, a turntable 11 to hold a disk temporarily, and an upper clamp 9 that is pushed in the lower clamp 8 when the medium is fixed. Since the outer diameter of the lower clamp 8 is made smaller than the inner diameter of a medium 6, the medium 6 can be placed on the turntable 11 without being in contact with the lower clamp 8. The upper clamp 9 interlocked with a device loading mechanism is lowered, then it is pushed in the lower clamp 8. In this way, the lower clamp 8, at the collet-shaped part of which a slit is provided, is spread, then being in contact with the medium 6, and the disk is held perfectly performing the center positioning.

Description

[Detailed description of the invention] Regarding the structure.

[Conventional technology]

Conventionally, this type of disk clamp mechanism, as shown in FIG. 4, includes a turntable 3 attached to the rotating shaft of a spindle motor, and a lower clamp 2 for positioning the center of the medium that is slidable in the vertical direction.

It was composed of an upper clamp 1 having a rotating shaft 5 at the same central position as the lower clamp in the vertical direction of the lower clamp 2.

In this disk clamp mechanism, the medium 6 is inserted between the turntable 3 and the upper clamp 1. Next, the loading mechanism (mechanism 1 that moves the medium up and down, not shown)
operates, and the medium 6 first contacts the lower clamp 2. At this time, medium 6 is.

It's just riding on the lower clamp 2.

The medium 6 is not always horizontal.

The upper clamp then descends and contacts the medium 6.

Since the lower clamp 2 is slidable, it is pushed down together with the medium 6. The lower clamp 2 stops when it comes into contact with the turntable 3, so the medium 6 slides on the surface of the lower clamp 2, and after being positioned at the correct position, the medium 6 is moved between the upper clamp 1 and the turntable 3 as shown in FIG. It is set in such a way that it is sandwiched between the two.

[Problem that the invention seeks to solve]

In this way, the conventional disk clamping mechanism places an excessive load on the medium and causes a loss of % or more. Since the medium is allowed to slide on the lower clamp, the medium may be damaged, and since the medium is slid on the lower clamp and pushed in, the medium may be deformed and set at an angle.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a disk clamping mechanism that allows precise center positioning.

[Means for solving problems]

According to the present invention, a disk clamping mechanism is obtained in which a slit is formed in a fixed lower flang and the upper flang is pushed into the lower flang, thereby completely holding the medium only by the turntable.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Referring to FIG. 1, one embodiment of the present invention includes a collet-shaped lower flange 8, a turntable 11 for temporarily holding a disk, and an upper flange 9 pushed into the lower flange 8 into a medium 981t. .

FIG. 2 shows that the medium 6 is inserted between the lower flang 8 and the upper flang 9 in the device, and the device loading mechanism (mechanism 1 for setting the medium) is used to set the medium.
(not shown) begins to operate.

A state in which the medium 6 is placed on the temporary holding turntable is shown. At this time, the outer diameter of the lower flange 8 is.

Since the diameter of the medium 6 is smaller than the inner diameter of the medium 6.

It can be placed on the temporary holding turntable 11 without contacting the lower clamp 8. In the state shown in FIG. 2, the medium 6 is only placed on the turntable 11 for temporary holding, and no center positioning or the like is performed.

FIG. 3 shows the state in which the medium 6 is finally fixed and held within the device and the setting is completed.

When the medium 6 is placed on the temporarily holding turntable 11 as shown in FIG. 2, the upper ring 9, which is interlocked with the device loading mechanism, is lowered and pushed into the lower flang 8. As a result, the lower flang 8, which has a collet-like slit, is spread out, and while contacting the medium 6, it completely holds the medium 6 while determining its center position.

In the explanation of this embodiment, after the medium 6 is placed on the temporary holding turntable 3, the upper flanges 9ft.
I explained that it would be lowered.

Since the upper clamp is linked to the device loading mechanism, no problem will occur even if the operation of loading the medium onto the turntable and the lowering of the upper clamp occur at the same time.

Further, in this embodiment, the lower ring 2 and the temporary holding turntable 3 are separated, but there is no difference in function even if they are formed of the same parts.

As described above, since the medium is always kept horizontal from the beginning, it is never set diagonally. Furthermore, since the medium itself is prevented from slipping and excessive load is not applied, the medium will not be damaged.

〔Effect of the invention〕

As explained above, the present invention has the collet-shaped lower flang, the turntable for temporary holding, and the upper clamp, so that accurate center positioning is easily performed and the medium is not damaged. be.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment of the disk clamping mechanism of the present invention, FIGS. 2 and 3 are side views showing the operation of an embodiment of the present invention, and FIGS. 4 and 5 are conventional FIG. 3 is a side view showing the disc clamp mechanism of FIG. 1... Upper clamp, 2... Lower clamp, 3... Turntable, 4...
Coil spring, 5...Share 7), 6...
WL 7...Spindle motor. 8...Lower clamp, 9...Upper clamp, 10g 0th/mouth 2nd hearing 3rd

Claims (1)

[Claims] A turntable for temporarily holding the medium is arranged perpendicular to the rotation axis of the spindle motor, a lower clamp with a slit is fixed on the turntable, and the lower clamp is movable up and down on a vertical extension of the center of the lower clamp. A disc clamp mechanism characterized by having an upper clamp.