JP3794911B2 - Disk centering holding device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In this invention, an information recording medium such as an optical disc or other perforated disc such as a disc-shaped work that requires high-precision machining is placed on a disc receiver provided at the upper end of a spindle, and centered and held. It is related with the apparatus to do.
[0002]
[Prior art]
When an information recording medium such as an optical disk or a magnetic disk is dried in a manufacturing process, or when information is recorded on a manufactured recording medium, or when processing a disk-shaped work that requires high-precision processing, for example, When the scale is processed on the scale disk of the encoder, a disk centering and holding device is used in which these perforated disks are placed on a disk receiver provided at the upper end of the spindle and centered and held.
[0003]
2A and 2B show an example of this type of centering holding device. This centering holding device pushes three clamp pins 53 radially arranged on a disk receiver 52 provided at the upper end of the spindle 51 to the outer peripheral side in the radial direction of the spindle 51, and places its tip on the disk receiver 52. The disk 54 is pressed against the inner peripheral surface of the center hole, and the disk 54 is held in a centered state. As a means for pushing out the clamp pin 53, a method is adopted in which a taper cone 55 that is lifted and lowered coaxially with the axis of the spindle 51 is brought into contact with the proximal end of the clamp pin 53, and as a means for releasing the clamp pin 53, the clamp pin 53 is used. A method is used in which the elastic body 56 is urged toward the center by the elastic body 56.
[0004]
[Problems to be solved by the invention]
The centering and holding device described above is arranged at a predetermined height that does not interfere with the disc mounting surface when the clamp pin is pushed out, so that the upper end surface is higher than the tip of the clamp pin even when placed on the disc receiver. If the disk is too thin, the tip of the clamp pin cannot be pressed against the inner peripheral surface of the center hole, and cannot be centered. As a means for centering and holding such a thin disk, there is a method in which the outer diameter of the body of the clamp pin is reduced so that the tip of the clamp pin is as close as possible to the disk mounting surface, but the rigidity of the clamp pin is small. Therefore, there is a problem that it is difficult to ensure stable centering accuracy.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a disk centering and holding device that can accurately center and hold a thin perforated disk.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides a disk receiver for mounting a perforated disk on the upper end of a spindle, and presses at least three inner peripheral surfaces of the center hole of the disk mounted on the disk receiver. Clamp pins are arranged with their tips facing the outer peripheral side of the spindle in the radial direction, a means for pushing out each of these clamp pins to the outer peripheral side of the spindle in the radial direction, and a biasing force to return each clamp pin to the center side of the spindle In the disk centering and holding device, the clamp pin pushed between the tip of each clamp pin and the inner peripheral surface of the center hole of the disk is pushed by the clamp pin pushed radially outward of the spindle. In this configuration, a pressing member that is pressed against the inner peripheral surface of the center hole of the disk is disposed.
[0007]
In other words, a pressing member that is pressed against the inner peripheral surface of the center hole of the disk by being pressed by the clamp pin that has been pushed to the outer peripheral side in the radial direction of the spindle is disposed between the tip of each clamp pin and the inner peripheral surface of the center hole of the disk. As a result, even a thin disk whose upper end surface does not reach the height of the tip of the clamp pin can be pressed with the clamp pin via the pressing member to be accurately centered and held.
[0008]
As a means for urging the clamp pin in the direction to return to the center side of the spindle, a method of forming the pressing member with an elastic body that generates an elastic restoring force in a direction to push back the clamp pin when pressed by the clamp pin. By adopting it, it is not necessary to provide means for urging the clamp pin in a direction to return the clamp pin separately from the pressing member, and the apparatus can be simplified.
[0009]
As the elastic body, a leaf spring can be adopted.
[0010]
By making the surface of the pressing member that is pressed against the inner peripheral surface of the center hole of the disk into an arc shape, it is possible to prevent wrinkling when the pressing member is pressed against the inner peripheral surface of the disk center hole. .
[0011]
As a means for pushing the clamp pin to the outer peripheral side in the radial direction of the spindle, a taper cone which is raised and lowered coaxially with the spindle shaft by a cylinder is projected upward from the disk mounting surface of the disk receiver, and this taper cone is projected onto the clamp pin. It is possible to employ a method of abutting the base end.
[0012]
The disc placed on the disc receiver may be thinner than the outer diameter of the clamp pin.
[0013]
That is, the disk centering and holding device of the present invention is suitable for centering and holding a disk whose thickness is smaller than the outer diameter of the clamp pin.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 (a) and 1 (b), this disk centering and holding device is attached to the upper end of a spindle 1 with a turntable 2 as a disk support with its central axis aligned with the spindle 1 axis. A cylindrical boss portion 4 into which a perforated disc 3 is fitted is integrally formed on the upper portion of the turntable 2, and a mounting surface 5 on which the disc 3 is placed around the boss portion 4 is annular. Is formed. The turntable 2 is attached to the spindle 1 by tightening the bolts 6 (not shown) by aligning the three bolt holes 6a formed in the flange 6 below the turntable 2 with the bolt holes 1a at the upper end of the spindle 1. ing.
[0015]
The turntable 2 communicates on the central axis thereof with the cylinder chamber 7, an air passage 8 that is supplied with compressed air from below, and a storage space 9 that communicates with the upper portion of the cylinder chamber 7. And are provided. A piston body 10 is slidably inserted into the cylinder chamber 7, and a tapered cone 11, which is housed in the housing space 9 and protrudes upward from the disk mounting surface 5 and is reduced in diameter upward, is integrally formed on the piston body 10. Is formed. Further, a suction groove 13 communicating with a suction passage 12 through which air sucked downward is passed is formed on the disk mounting surface 5 in an annular shape.
[0016]
The boss portion 4 has an upper outer diameter smaller than that of the lower portion, and three pin holes 15 into which the clamp pin 14 is fitted at a predetermined height position on the peripheral wall of the large diameter portion have a central angle 120. A leaf spring 16 is attached to the outer peripheral wall of the small-diameter portion at the same circumferential position as each pin hole 15 with a screw 17 at the base end portion 16a. An adjustment screw 18 is screwed from the upper end surface of the boss portion 4 to close the storage space 9, and a coil spring 19 attached to the lower surface of the adjustment screw 18 has its tip fitted into the upper portion of the taper cone 11. The piston body 10 is urged downward.
[0017]
Both ends of the clamp pin 14 are formed in a spherical shape, a base end 14 a is in contact with the tapered cone 11, and a tip end 14 b is directed to the radially outer peripheral side of the turntable 2. The disk 3 placed on the disk placing surface 5 is thinner than the outer diameter of the body of the clamp pin 14.
[0018]
The lower end 16b of the leaf spring 16 is inserted between the clamp pin tip 14b and the inner peripheral surface of the center hole of the disk 3 and extends to the vicinity of the disk mounting surface 5. Therefore, even if the upper end surface of the disk 3 does not reach the height of the clamp pin tip 14b, the lower end portion 16b of the leaf spring 16 pressed against the clamp pin 14 is pressed against the inner peripheral surface of the center hole of the disk 3, and the disk 3 can be centered and held.
[0019]
Further, when the leaf spring 16 is pressed against the clamp pin 14, an elastic restoring force is generated in a direction in which the clamp pin 14 is pushed back, and the clamp pin 14 is urged toward the center side of the turntable 2. .
[0020]
Further, the surface of the leaf spring 16 on the side pressed against the disk 3 is formed in an arc shape substantially along the inner peripheral surface of the central hole of the disk 3 so that the inner peripheral surface of the central hole of the disk 3 is not easily wrinkled. It has become.
[0021]
When the disk 3 is centered and held, compressed air is supplied from the air passage 8 and the piston body 10 is pushed up so that the diameter of the conical surface of the tapered cone 11 abutted against the base end 14a of each clamp pin 14 is increased. Each clamp pin 14 is pushed out to the outer peripheral side in the radial direction of the turntable 2, and the lower end portion 16 b of each leaf spring 16 pressed against the tip 14 b of each clamp pin 14 is formed on the inner peripheral surface of the center hole of the disk 3. Pressed. After centering, the disk 3 is adsorbed to the suction groove 13 by the air in the suction passage 12 being sucked downward. The force for holding the disk 3 can be adjusted by changing the diameter of the conical surface of the tapered cone 11 abutted against the clamp pin 14 by adjusting the screwing amount of the adjusting screw 18.
[0022]
When the disk 3 is attached or removed, the supply of compressed air from the air passage 8 is stopped so that the taper cone 11 is urged downward by the coil spring 19 and comes into contact with the clamp pin 14. The diameter of the conical surface of the taper cone 11 is reduced, and each clamp pin 14 urged by the leaf spring 16 is retracted toward the center side, so that the disc 3 placed on the turntable 2 is pressed against the inner peripheral surface of the center hole. Canceled. At this time, the suction of air in the suction passage 12 is also stopped, and the suction of the disk 3 to the suction groove 13 is also released.
[0023]
In the embodiment described above, the tapered cone that pushes out the clamp pin is reduced in diameter upward, but may be reduced in diameter downward. Further, four or more clamp pins may be arranged radially, and when the number of clamp pins is increased, the pressing members such as leaf springs may be increased by the same number.
[0024]
【The invention's effect】
As described above, the disk centering and holding device of the present invention is pressed between the tip of each clamp pin and the inner peripheral surface of the center hole of the disk by the clamp pin pushed to the outer peripheral side in the radial direction of the spindle, Since a pressing member that is pressed against the inner peripheral surface of the center hole of the disk is arranged, even a thin disk whose upper end surface does not reach the height of the tip of the clamp pin can be pressed with the clamp pin via the pressing member. , Can be accurately centered and held.
[Brief description of the drawings]
1A is a top view of the centering holding device of the embodiment, b is a longitudinal sectional view of a, FIG. 2 is a top view of a conventional centering holding device, and b is a longitudinal sectional view of a. Explanation】
DESCRIPTION OF SYMBOLS 1 Spindle 1a Bolt hole 2 Turntable 3 Disc 4 Boss part 5 Mounting surface 6 鍔 6a Bolt hole 7 Cylinder chamber 8 Air passage 9 Storage space 10 Piston body 11 Taper cone 12 Suction passage 13 Suction groove 14 Clamp pin 14a Base end 14b Tip 15 Pin hole 16 Leaf spring 16a Base end portion 16b Lower end portion 17 Screw 18 Adjustment screw 19 Coil spring

Claims (6)

A disk holder for mounting a perforated disk is provided at the upper end of the spindle, and at least three clamp pins that press the inner peripheral surface of the center hole of the disk mounted on the disk receiver are arranged at the tip end in the radial direction of the spindle. A disk centering and holding device provided with means for pushing the clamp pins to the outer peripheral side in the radial direction of the spindle and means for biasing the clamp pins back to the center side of the spindle In the above, between the tip of each clamp pin and the inner peripheral surface of the center hole of the disk, the base end is located above the tip of the clamp pin and the lower end is below the tip of the clamp pin and the inner peripheral surface of the center hole of the disk A pressing member extending so as to face the outer surface of the spindle, and the pressing member is pressed by a clamp pin pushed to the outer peripheral side in the radial direction of the spindle. Centering holding device of the disc, characterized in that as pressed against the center hole inner peripheral surface of the click. The means for urging the clamp pin in the direction to return to the center side of the spindle is formed by an elastic body that generates an elastic restoring force in the direction in which the clamp pin is pushed back when the pressing member is pressed by the clamp pin. The disk centering and holding device according to claim 1. The disk centering and holding device according to claim 2, wherein the elastic body is a leaf spring. The disk centering and holding device according to any one of claims 1 to 3, wherein a surface of the pressing member that is pressed against the inner peripheral surface of the center hole of the disk has an arc shape along the inner peripheral surface of the center hole of the disk. . The means for pushing the clamp pin to the outer peripheral side in the radial direction of the spindle projects a taper cone that is lifted and lowered coaxially with the spindle axis by the cylinder, and projects the taper cone from the disk mounting surface of the disk receiver. 5. The disk centering and holding device according to claim 1, wherein the disk centering and holding device is in contact with a base end. 6. The disk centering and holding device according to claim 1, wherein a thickness of the disk placed on the disk receiver is thinner than an outer diameter of the clamp pin.

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