JPH0521286Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a method for performing predetermined processing on disks such as magnetic disks made of aluminum substrates and optical disks made of synthetic resin substrates. This invention relates to a disk chuck device for rotatably supporting a disk.

[Prior Art] A disk chuck device is used to chuck a disk, such as a magnetic disk, and rotate the disk. Conventionally, this disk chuck device is as shown in FIG. At the tip of the spindle 1, there is a large diameter part 2a and a small diameter part 2.
A disk support part 2 having a structure b is provided, a disk 3 is attached to this disk support part 2, and a cap 4 is attached.
A structure is known in which the disk 3 is supported by fitting the disk into the disk support portion 2. When installing this disc chuck, the inner peripheral part of the disc 3 is connected to the small diameter part 2.
b, and is held and supported between the large diameter portion 2a and the cap 4.

Further, as shown in FIG. 4, the tip of the spindle 5 is formed hollow, and a flange-shaped disk support portion 6 is provided, and slits 7 are provided at a plurality of locations in the axial direction from the disk support portion 6. By inserting the wedge member 8 into the hollow portion of the spindle 5, the diameter of the disk support portion 6 is expanded, and the disk support portion 6 is supported by coming into contact with the inner circumferential surface of the disk 3. There are also known ones that did this.

[Problems to be Solved by the Invention] Incidentally, in the disk chuck device of the prior art described above, in the structure shown in FIG. In order to make the small diameter portion 2b fit together, the small diameter portion 2b must be formed smaller than the inner diameter of the disk 3. Therefore, when the disk 3 is supported by the disk support portion 2, the small diameter portion of the disk 3 and the disk support portion 2 2b, a slight gap is created between the disc 3 and the disc 3, and as a result, when the disc 3 rotates, a small amount of core run-out occurs in the radial direction of the disc 3. Furthermore, in the case of the structure shown in FIG. 4, the disk support portion 6 supports the inner surface of the disk 3 in almost a line contact state, so that the above-mentioned center runout does not occur. However, the support is not stable, and surface runout in the thickness direction of the disk 3 may occur. If such center runout or surface runout occurs, even if it is only slight, it may be necessary to polish the surface of the disk or perform texture treatments to form many fine grooves on the surface of the disk. When precision machining is performed, there is a disadvantage that machining unevenness occurs.

The present invention was developed in view of the above points, and its purpose is to enable the disk to be supported in an extremely stable state without causing center runout or surface runout. The object of the present invention is to provide a disk-check device.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a plurality of arc-shaped actuating parts that can be expanded and contracted in the radial direction at the tip of the spindle, and the actuating parts A push shaft having a wedge member at its tip is disposed opposite to a disk support portion having a receiving portion that comes into contact with the inner peripheral side surface of the disk and an inner peripheral surface support portion that comes into contact with and separates from the inner peripheral surface, a disk mounting state in which the pushing shaft is separated from the disk support portion and the disk can be inserted into the disk support portion;
The wedge member expands the diameter of the disk support portion so that the inner peripheral surface support portion can be displaced between a chuck state and a chuck state in which the inner peripheral surface support portion contacts the inner peripheral surface of the disk. an elastic member that comes into contact with the other inner peripheral side surface of the disk and elastically pushes the inner peripheral side surface of the disk in a direction that presses the disk into contact with the receiving part when the disk is displaced to the receiving part; This is its characteristic.

[Function] By configuring as described above, the pushing shaft is detached from the disk support portion provided on the spindle, and the disk is held in a reduced diameter disk attached state, and in this state, the disk is held, for example, in its position. It is attached to the disk support using an appropriate transfer means such as chucking the outer peripheral edge. At this time,
Since the disk support portion has a small diameter, the disk can be easily fitted without contacting the inner peripheral surface support portion of the disk support portion.
Generation of wear particles can be prevented.

Then, when the disk is in a position where its side surface is brought into contact with the receiving part of the disk support part,
When the push shaft disposed opposite to the disk support section is operated and inserted into the disk support section, the diameter of the disk support section is expanded by the action of the wedge member, and the inner peripheral surface support section is expanded. It is displaced into a chuck state where it comes into contact with the inner peripheral surface of the disk. If the disk is further pushed into the push shaft in this state, the inner circumferential support portion will come into pressure contact with the disk, and the elastic member provided on the push shaft will come into contact with the other side surface of the disk.

As a result, the diameter of the inner circumferential surface support portion of the disk support portion is expanded, and a force is applied to the disk in a direction that presses it outward in the radial direction.
The inner circumferential side surface is pressed against the receiving portion by the elastic member, and the disk is supported by the spindle in an extremely stable state. Moreover, the pressing force against the inner circumferential surface of the disk by the inner circumferential surface support section is
Since this is due to the elastic deformation of the actuating piece that constitutes the inner circumferential surface support section, it is supported elastically, and the pressing force on the receiving section on the inner circumferential side surface is also due to the elastic deformation of the elastic member. Since this is obtained by pressing force, there will be no problem such as damage to the disk even if a large force is applied to stabilize the support of the disk when chucking the disk. Therefore, even if the spindle is rotated at high speed, the disk will be held in an extremely stable state without causing center runout or surface runout. Therefore, when performing predetermined processing while rotating the disk in this manner, the processing work can be performed extremely smoothly and with high precision.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

First, FIG. 1 shows the overall structure of a diskette device according to the present invention.

In the figure, reference numeral 10 indicates a spindle that is rotatably driven by a belt 11, and the spindle 10 is rotatably supported by a bearing 12. A disk support section 13 is connected to the tip of the spindle 10. This disk support part 13 has a hollow tip portion of the rotating shaft 10, and a flange 14 is provided at the tip position, and a slit 15 having a length of almost the entire length of the hollow portion is formed from the flange 14. As a result, it is in a state of splitting. As a result, the hollow part from the collar 14 is divided into a plurality of actuating parts 16,
The collar 14 can be expanded and contracted in the radial direction.

As shown in FIG. 2, the outer circumferential edge of the collar 14 in the disk support portion 13 is formed into a substantially L-shape, and the small diameter portion is an inner circumferential surface support that approaches and separates from the inner circumferential surface of the disk 17. 18, and the step wall between the small diameter part and the large diameter part is the disc 17.
It forms a receiving part 19 that comes into contact with one side of the inner circumferential side. Thus, when the operating piece 16 of the disk support section 13 is in the reduced diameter state, the outer diameter of the inner peripheral surface support section 18 is slightly smaller than the inner diameter of the disk 14.

In order to expand the diameter of the inner circumferential surface support portion 18 of the disk support portion 13 radially outward from the aforementioned reduced diameter state, a push shaft 20 is disposed opposite to the disk support portion 13 connected to the spindle 10. ing. This push shaft 20 has a rod 22 slidably inserted into a guide block 21.
It is attached to a plate body 23 fixed to the tip of the. This pushing shaft 20 is connected to the spindle 10.
For this purpose, the plate body 23 has a shaft 24 protruding from it and is connected to the shaft 24 via a bearing 25, whereby the pushing shaft 20 is rotatable relative to the shaft 24. Further, a cylinder 26 is connected to the plate body 23, and the cylinder 26
This allows the pushing shaft 20 to be reciprocated together with the plate 23. and,
A wedge member 27 having a conical tapered surface 27a is provided at the tip of the pushing shaft 20, and an elastic member 28 made of urethane rubber or the like is fixedly provided on the outer peripheral side of the wedge member 27.

This embodiment is constructed as described above, and its operation will be explained next.

First, the cylinder 26 is brought into a contracted state, the push shaft 20 is separated from the disk support part 13 of the spindle 10, and the diameter of the actuating member 16 constituting the disk support part 13 is reduced. As a result, the inner circumferential surface support portion 18 of the disk support portion 13 is maintained in a disk-mounted state in which the inner diameter of the disk support portion 18 is smaller than the inner diameter of the disk 17. Then, the disk support portion 13 is mounted on the disk 17 by suitable transfer means such as a chuck means for chucking the outer peripheral edge of the disk 17, for example. Here, since the inner peripheral surface support part 18 of the disk support part 13 is reduced in diameter and its outer diameter dimension is smaller than the inner diameter of the disk 17, the inner peripheral surface support part 18 of the disk support part 13 is
The disc 17 can be easily mounted without contacting the disc 17, and no abrasion powder or the like is generated when the disc 17 is mounted.

When the disc 17 reaches a position where its inner peripheral side surface contacts the receiving part 19 of the disc support part 13, the cylinder 26 is actuated to move the wedge member 27 of the push shaft 20 to support the disc. Push it into the section 13. Since the wedge member 27 has a tapered surface 27a, the disk support portion 1 is moved in accordance with the pushing amount of the pushing shaft 20.
The operating piece 16 constituting the disc 17 is expanded in diameter outward in the radial direction, and as a result, the inner circumferential surface support portion 18 formed on the collar 14 is brought into contact with the inner circumferential surface of the disc 17. It will be forced to change the state. Then, push shaft 2
When 0 is pushed in by a predetermined amount, the pressing force exerted by the inner circumferential surface support portion 18 against the inner circumferential surface of the disk 17 increases. At the same time, the elastic member 28 provided on the pushing shaft 20 comes into contact with the inner peripheral side surface of the disk 17, and both the front and back surfaces of the disk 17 are held between the elastic member 28 and the receiving part 19. As a result, the disk 17 is supported in an extremely stable state without being displaced.

By pushing in the push shaft 20, the actuating member 16 is elastically deformed, and the inner circumferential surface supporting portion 18 is pressed against the inner circumferential surface of the disk 17. The pressing force exerted by the support portion 18 on the inner circumferential surface of the disk 17 is elastic. In addition, for the side surface on the inner peripheral side of the disk 17, a receiving portion 19 in the disk support portion 13 is provided.
Since the pressing force is applied by the elastic member 28 provided on the pushing shaft 20 in order to press the disk 17 against the disk 17, the pressing force against the side surface of the disk 17 is also elastic. Therefore, the disk support part 1
Even if an extremely strong force is applied to the disk 17 by the forceps 3, no problem such as damage to the disk 17 will occur. Moreover, the disk 17 is fixed in the radial direction, that is, in the plate surface direction, by the inner circumferential surface support portion 18 due to an outward force acting thereon, and the receiving portion 19 and the elastic member 28 are fixed in this direction. By being held between them, a holding force is applied in a direction perpendicular to the radial direction, that is, in the thickness direction, and the plate is also fixed in this direction. Therefore, this disk 17 is in an extremely stable state on the spindle 1.
0, and is maintained in a stable state even when an external force is applied when the abrasive tape is brought into contact with the spindle 10 while it is rotating, and there is no risk that the disk 17 will run out during rotation. . As a result, precise surface processing such as surface polishing and texturing by pressing the abrasive tape against the disk 17 can be performed extremely smoothly and with extremely high precision.

However, there are dimensional errors in the thickness, inner diameter, position of the receiving portion 19, etc. of the disk 17, and these are not necessarily constant. However, such dimensional errors can be absorbed by the elastic member 28 attached to the push shaft 20, so that the disk 17 can be
8, and the stable support of the disk 17 is not impaired.

[Effects of the invention] As explained above, according to the invention, the disk is provided with an inner circumferential surface support portion whose inner circumferential surface can be expanded and contracted;
Since the inner circumferential surface of the disk is configured to be elastically pushed in the direction of pressure contact with the receiving part by the elastic member, the action of pushing the push shaft into the spindle causes the disk to be pushed in the radial direction, that is, by the action of pushing the push shaft into the spindle. An outward force acts directly in the direction of the plate surface,
In addition, the clamping force between the receiving part and the elastic member acts directly to keep the disk in an extremely stable state, and since all of these forces acting on the disk are elastic forces, an extremely large force cannot be applied. It is possible to stably support the disk without damaging it even when external forces are applied to the disk, such as polishing by bringing the abrasive tape into contact with the disk while rotating the disk at high speed. Since the disk rotates in an extremely stable state without causing surface wobbling or the like, the disk can be processed smoothly.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention. FIG. 1 is an overall configuration diagram of a disk chuck device, FIG. 2 is a sectional view of the main part of FIG. 1, and FIGS. FIG. 4 is a sectional view of a main part of a conventional disk drive device having a different structure. DESCRIPTION OF SYMBOLS 10... Spindle, 13... Disk support part, 14... Tsuba, 15... Slit, 16... Actuation piece, 17... Disk, 18... Inner peripheral surface support part, 19... Receiving part, 20 ...Pushing shaft, 2
6... Cylinder, 27... Wedge member, 27a... Tapered surface, 28... Elastic member.

Claims (1)

[Scope of utility model registration request] A plurality of arc-shaped actuating parts that can be expanded and contracted in the radial direction are connected to the tip of the spindle, and each actuating part has a receiving part that comes into contact with the inner circumferential side surface of the disk, and an inner part that comes into contact with and separates from the inner circumferential surface. A push shaft having a wedge member at its tip is arranged opposite to a disk support portion having a peripheral surface support portion, and the push shaft is separated from the disk support portion and the disk is inserted into the disk support portion. and a chuck state in which the disk supporting portion is expanded in diameter by the wedge member and the inner circumferential surface supporting portion is in contact with the inner circumferential surface of the disk, and The push-in shaft includes a push shaft that, when displaced to the chuck state, pushes the other inner side surface of the disk and elastically pushes the inner circumferential side surface of the disk into pressure contact with the receiving portion. What is claimed is: 1. A disk chuck device characterized in that it has a structure in which an elastic member is provided.